One more include<functional>

Disable warning as error
Add some include<functional>
2026-11-06 02:52:35 -05:00 · 2019-10-31 14:53:20 -07:00 · 2019-10-31 14:53:04 -07:00 · 2019-10-31 14:52:49 -07:00 · 2019-10-31 14:52:49 -07:00 · 2017-07-17 21:07:44 -07:00
708 changed files with 27419 additions and 114782 deletions
@@ -3,15 +3,8 @@
  "conduit_uri" : "https://reviews.facebook.net/",
  "copyright_holder" : "Facebook",
  "load" : [
-    "arcanist_util"
+    "linters"
  ],
  "lint.engine" : "FacebookFbcodeLintEngine",
-  "lint.engine.single.linter" : "FbcodeCppLinter",
-  "unit.engine" : "FacebookFbcodeUnitTestEngine",
-  "arcanist_configuration" : "FacebookArcanistConfiguration",
-  "base" : "git:HEAD^, hg:.^",
-  "git.default-relative-commit" : "HEAD^",
-  "git:arc.feature.start.default" : "origin/master",
-  "arc.feature.start.default" : "master",
-  "history.immutable" : false
+  "lint.engine.single.linter" : "FbcodeCppLinter"
 }
@@ -1,5 +1,5 @@
 TARGETS
-make_config.mk
+build_config.mk

 *.a
 *.arc
@@ -20,14 +20,6 @@ make_config.mk
 *.d-e
 *.o-*
 *.swp
-*~
-*.vcxproj
-*.vcxproj.filters
-*.sln
-*.cmake
-CMakeCache.txt
-CMakeFiles/
-build/

 ldb
 manifest_dump
@@ -38,14 +30,9 @@ coverage/COVERAGE_REPORT
 .gdbhistory
 package/
 .phutil_module_cache
-unity
 tags
-rocksdb_dump
-rocksdb_undump

 java/out
-java/target
-java/test-libs
 java/*.log
 java/include/org_rocksdb_*.h

@@ -57,7 +44,3 @@ java/crossbuild/.vagrant
 .vagrant/
 java/**.asc
 java/javadoc
-
-scan_build_report/
-t
-LOG
@@ -5,15 +5,15 @@ before_install:
 # which needs the following ugly dependency incantations to build RocksDB:
 - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
 - sudo apt-get update -qq
- - sudo apt-get install -y -qq gcc-4.9 g++-4.9 zlib1g-dev libbz2-dev libsnappy-dev
- - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 50
- - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 50
+ - sudo apt-get install -y -qq gcc-4.8 g++-4.8 zlib1g-dev libbz2-dev libsnappy-dev libjemalloc-dev
+ - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50
+ - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
 - wget https://gflags.googlecode.com/files/libgflags0_2.0-1_amd64.deb
 - sudo dpkg -i libgflags0_2.0-1_amd64.deb
 - wget https://gflags.googlecode.com/files/libgflags-dev_2.0-1_amd64.deb
 - sudo dpkg -i libgflags-dev_2.0-1_amd64.deb
 # Lousy hack to disable use and testing of fallocate, which doesn't behave quite
 # as EnvPosixTest::AllocateTest expects within the Travis OpenVZ environment.
-script: OPT=-DTRAVIS V=1 make unity && make clean && OPT=-DTRAVIS V=1 make db_test && ./db_test && OPT=-DTRAVIS V=1 make clean jclean rocksdbjava jtest
+script: OPT=-DTRAVIS make unity && make clean && OPT="-DTRAVIS -Wshadow" make check -j8
 notifications:
    email: false
@@ -1,347 +0,0 @@
-# This cmake build is for Windows 64-bit only.
-#
-# Prerequisites:
-#     You must have Visual Studio 2013 Update 4 installed. Start the Developer Command Prompt window that is a part of Visual Studio installation.
-#     Run the build commands from within the Developer Command Prompt window to have paths to the compiler and runtime libraries set.
-#     You must have git.exe in your %PATH% environment variable.
-#
-# To build Rocksdb for Windows is as easy as 1-2-3-4-5:
-#
-# 1. Update paths to third-party libraries in thirdparty.inc file
-# 2. Create a new directory for build artifacts
-#        mkdir build
-#        cd build
-# 3. Run cmake to generate project files for Windows, add more options to enable required third-party libraries.
-#    See thirdparty.inc for more information.
-#        cmake -G "Visual Studio 12 Win64" .. <more options>
-# 4. Then build the project in debug mode (you may want to add /m:<N> flag to run msbuild in <N> parallel threads)
-#        msbuild ALL_BUILD.vcxproj
-# 5. And release mode (/m:<N> is also supported)
-#        msbuild ALL_BUILD.vcxproj /p:Configuration=Release
-#
-
-cmake_minimum_required(VERSION 2.6)
-project(rocksdb)
-
-include(${CMAKE_CURRENT_SOURCE_DIR}/thirdparty.inc)
-
-execute_process(COMMAND $ENV{COMSPEC} " /C date /T" OUTPUT_VARIABLE DATE)
-execute_process(COMMAND $ENV{COMSPEC} " /C time /T" OUTPUT_VARIABLE TIME)
-string(REGEX REPLACE "(..)/(..)/..(..).*" "\\1/\\2/\\3" DATE ${DATE})
-string(REGEX REPLACE "(..):(.....).*" " \\1:\\2" TIME ${TIME})
-string(CONCAT GIT_DATE_TIME ${DATE} ${TIME})
-
-execute_process(COMMAND $ENV{COMSPEC} " /C git rev-parse HEAD 2>nil" OUTPUT_VARIABLE GIT_SHA)
-string(REGEX REPLACE "[^0-9a-f]+" "" GIT_SHA ${GIT_SHA})
-
-set(BUILD_VERSION_CC ${CMAKE_CURRENT_SOURCE_DIR}/util/build_version.cc)
-
-add_custom_command(OUTPUT ${BUILD_VERSION_CC}
-    COMMAND echo "#include \"build_version.h\"" > ${BUILD_VERSION_CC}
-    COMMAND echo "const char* rocksdb_build_git_sha = \"rocksdb_build_git_sha:${GIT_SHA}\";" >> ${BUILD_VERSION_CC}
-    COMMAND echo "const char* rocksdb_build_git_datetime = \"rocksdb_build_git_datetime:${GIT_DATE_TIME}\";" >> ${BUILD_VERSION_CC}
-    COMMAND echo const char* rocksdb_build_compile_date = __DATE__\; >> ${BUILD_VERSION_CC}
-)
-
-add_custom_target(GenerateBuildVersion DEPENDS ${BUILD_VERSION_CC})
-
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi /nologo /W3 /WX /EHsc /GS /fp:precise /Zc:wchar_t /Zc:forScope /Gd /TP /errorReport:queue")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /FC /d2Zi+ /wd4018 /wd4100 /wd4101 /wd4127 /wd4189 /wd4200 /wd4244 /wd4267 /wd4296 /wd4305 /wd4307 /wd4309 /wd4512 /wd4701 /wd4702 /wd4800 /wd4804 /wd4996")
-
-set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /Od /RTC1 /Gm /MDd")
-set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /O2 /Oi /Gm- /Gy /MD")
-
-set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /DEBUG")
-
-add_definitions(-DWIN32 -DOS_WIN -D_MBCS -DWIN64)
-
-include_directories(${PROJECT_SOURCE_DIR})
-include_directories(${PROJECT_SOURCE_DIR}/include)
-include_directories(${PROJECT_SOURCE_DIR}/port)
-include_directories(${PROJECT_SOURCE_DIR}/third-party/gtest-1.7.0/fused-src)
-
-set(ROCKSDB_LIBS rocksdblib${ARTIFACT_SUFFIX})
-set(THIRDPARTY_LIBS ${THIRDPARTY_LIBS} gtest)
-set(SYSTEM_LIBS Shlwapi.lib Rpcrt4.lib)
-
-set(LIBS ${ROCKSDB_LIBS} ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
-
-add_subdirectory(third-party/gtest-1.7.0/fused-src/gtest)
-
-set(SOURCES
-        db/builder.cc
-        db/c.cc
-        db/column_family.cc
-        db/compacted_db_impl.cc
-        db/compaction.cc
-        db/compaction_job.cc
-        db/compaction_picker.cc
-        db/convenience.cc
-        db/dbformat.cc
-        db/db_filesnapshot.cc
-        db/db_impl.cc
-        db/db_impl_debug.cc
-        db/db_impl_experimental.cc
-        db/db_impl_readonly.cc
-        db/db_iter.cc
-        db/event_helpers.cc
-        db/experimental.cc
-        db/filename.cc
-        db/file_indexer.cc
-        db/flush_job.cc
-        db/flush_scheduler.cc
-        db/forward_iterator.cc
-        db/internal_stats.cc
-        db/log_reader.cc
-        db/log_writer.cc
-        db/managed_iterator.cc
-        db/memtable.cc
-        db/memtable_allocator.cc
-        db/memtable_list.cc
-        db/merge_helper.cc
-        db/merge_operator.cc
-        db/repair.cc
-        db/slice.cc
-        db/table_cache.cc
-        db/table_properties_collector.cc
-        db/transaction_log_impl.cc
-        db/version_builder.cc
-        db/version_edit.cc
-        db/version_set.cc
-        db/wal_manager.cc
-        db/write_batch.cc
-        db/write_batch_base.cc
-        db/write_controller.cc
-        db/write_thread.cc
-        port/stack_trace.cc
-        port/win/env_win.cc
-        port/win/port_win.cc
-        port/win/win_logger.cc
-        table/adaptive_table_factory.cc
-        table/block.cc
-        table/block_based_filter_block.cc
-        table/block_based_table_builder.cc
-        table/block_based_table_factory.cc
-        table/block_based_table_reader.cc
-        table/block_builder.cc
-        table/block_hash_index.cc
-        table/block_prefix_index.cc
-        table/bloom_block.cc
-        table/cuckoo_table_builder.cc
-        table/cuckoo_table_factory.cc
-        table/cuckoo_table_reader.cc
-        table/flush_block_policy.cc
-        table/format.cc
-        table/full_filter_block.cc
-        table/get_context.cc
-        table/iterator.cc
-        table/merger.cc
-        table/meta_blocks.cc
-        table/mock_table.cc
-        table/plain_table_builder.cc
-        table/plain_table_factory.cc
-        table/plain_table_index.cc
-        table/plain_table_key_coding.cc
-        table/plain_table_reader.cc
-        table/table_properties.cc
-        table/two_level_iterator.cc
-        util/arena.cc
-        util/auto_roll_logger.cc
-        util/bloom.cc
-        util/build_version.cc
-        util/cache.cc
-        util/coding.cc
-        util/compaction_job_stats_impl.cc
-        util/comparator.cc
-        util/crc32c.cc
-        util/db_info_dumper.cc
-        util/delete_scheduler_impl.cc
-        util/db_test_util.cc
-        util/dynamic_bloom.cc
-        util/env.cc
-        util/env_hdfs.cc
-        util/event_logger.cc
-        util/file_util.cc
-        util/file_reader_writer.cc
-        util/filter_policy.cc
-        util/hash.cc
-        util/hash_cuckoo_rep.cc
-        util/hash_linklist_rep.cc
-        util/hash_skiplist_rep.cc
-        util/histogram.cc
-        util/instrumented_mutex.cc
-        util/iostats_context.cc
-        util/ldb_cmd.cc
-        util/ldb_tool.cc
-        util/logging.cc
-        util/log_buffer.cc
-        util/memenv.cc
-        util/mock_env.cc
-        util/murmurhash.cc
-        util/mutable_cf_options.cc
-        util/options.cc
-        util/options_builder.cc
-        util/options_helper.cc
-        util/perf_context.cc
-        util/perf_level.cc
-        util/rate_limiter.cc
-        util/skiplistrep.cc
-        util/slice.cc
-        util/sst_dump_tool.cc
-        util/statistics.cc
-        util/status.cc
-        util/string_util.cc
-        util/sync_point.cc
-        util/testharness.cc
-        util/testutil.cc
-        util/thread_local.cc
-        util/thread_status_impl.cc
-        util/thread_status_updater.cc
-        util/thread_status_updater_debug.cc
-        util/thread_status_util.cc
-        util/thread_status_util_debug.cc
-        util/vectorrep.cc
-        util/xfunc.cc
-        util/xxhash.cc
-        utilities/backupable/backupable_db.cc
-        utilities/checkpoint/checkpoint.cc
-        utilities/document/document_db.cc
-        utilities/document/json_document.cc
-        utilities/document/json_document_builder.cc
-        utilities/flashcache/flashcache.cc
-        utilities/geodb/geodb_impl.cc
-        utilities/leveldb_options/leveldb_options.cc
-        utilities/merge_operators/string_append/stringappend.cc
-        utilities/merge_operators/string_append/stringappend2.cc
-        utilities/merge_operators/put.cc
-        utilities/merge_operators/uint64add.cc
-        utilities/redis/redis_lists.cc
-        utilities/spatialdb/spatial_db.cc
-        utilities/table_properties_collectors/compact_on_deletion_collector.cc
-        utilities/transactions/optimistic_transaction_impl.cc        
-        utilities/transactions/optimistic_transaction_db_impl.cc
-        utilities/ttl/db_ttl_impl.cc
-        utilities/write_batch_with_index/write_batch_with_index.cc
-        utilities/write_batch_with_index/write_batch_with_index_internal.cc
-)
-
-add_library(rocksdblib${ARTIFACT_SUFFIX} ${SOURCES})
-set_target_properties(rocksdblib${ARTIFACT_SUFFIX} PROPERTIES COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/rocksdblib${ARTIFACT_SUFFIX}.pdb")
-add_dependencies(rocksdblib${ARTIFACT_SUFFIX} GenerateBuildVersion)
-
-add_library(rocksdb${ARTIFACT_SUFFIX} SHARED ${SOURCES})
-set_target_properties(rocksdb${ARTIFACT_SUFFIX} PROPERTIES COMPILE_FLAGS "-DROCKSDB_DLL -DROCKSDB_LIBRARY_EXPORTS /Fd${CMAKE_CFG_INTDIR}/rocksdb${ARTIFACT_SUFFIX}.pdb")
-add_dependencies(rocksdb${ARTIFACT_SUFFIX} GenerateBuildVersion)
-target_link_libraries(rocksdb${ARTIFACT_SUFFIX} ${LIBS})
-
-set(APPS
-        db/db_bench.cc
-        db/memtablerep_bench.cc
-        table/table_reader_bench.cc
-        tools/db_stress.cc
-        tools/db_repl_stress.cc
-        tools/sst_dump.cc
-        tools/dump/rocksdb_dump.cc
-        tools/dump/rocksdb_undump.cc
-        util/cache_bench.cc
-)
-
-set(TESTS
-        db/c_test.c
-        db/column_family_test.cc
-        db/compact_files_test.cc
-        db/compaction_job_test.cc
-        db/compaction_job_stats_test.cc
-        db/compaction_picker_test.cc
-        db/comparator_db_test.cc
-        db/corruption_test.cc
-        db/cuckoo_table_db_test.cc
-        db/db_iter_test.cc
-        db/db_test.cc
-        db/db_compaction_filter_test.cc
-        db/db_compaction_test.cc
-        db/db_dynamic_level_test.cc
-        db/db_inplace_update_test.cc
-        db/db_log_iter_test.cc
-        db/db_universal_compaction_test.cc
-        db/db_wal_test.cc
-        db/db_tailing_iter_test.cc
-        db/dbformat_test.cc
-        db/deletefile_test.cc
-        db/fault_injection_test.cc
-        db/file_indexer_test.cc
-        db/filename_test.cc
-        db/flush_job_test.cc
-        db/listener_test.cc
-        db/log_test.cc
-        db/memtable_list_test.cc
-        db/merge_test.cc
-        db/merge_helper_test.cc
-        db/perf_context_test.cc
-        db/plain_table_db_test.cc
-        db/prefix_test.cc
-        db/skiplist_test.cc
-        db/table_properties_collector_test.cc
-        db/version_builder_test.cc
-        db/version_edit_test.cc
-        db/version_set_test.cc
-        db/wal_manager_test.cc
-        db/write_batch_test.cc
-        db/write_callback_test.cc
-        db/write_controller_test.cc
-        table/block_based_filter_block_test.cc
-        table/block_hash_index_test.cc
-        table/block_test.cc
-        table/cuckoo_table_builder_test.cc
-        table/cuckoo_table_reader_test.cc
-        table/full_filter_block_test.cc
-        table/merger_test.cc
-        table/table_test.cc
-        tools/db_sanity_test.cc
-        tools/reduce_levels_test.cc
-        util/arena_test.cc
-        util/autovector_test.cc
-        util/auto_roll_logger_test.cc
-        util/bloom_test.cc
-        util/cache_test.cc
-        util/coding_test.cc
-        util/crc32c_test.cc
-        util/dynamic_bloom_test.cc
-        util/env_test.cc
-        util/event_logger_test.cc
-        util/filelock_test.cc
-        util/file_reader_writer_test.cc
-        util/heap_test.cc
-        util/histogram_test.cc
-        util/manual_compaction_test.cc
-        util/memenv_test.cc
-        util/mock_env_test.cc
-        util/options_test.cc
-        util/rate_limiter_test.cc
-        util/slice_transform_test.cc
-        util/sst_dump_test.cc
-        util/thread_list_test.cc
-        util/thread_local_test.cc
-        utilities/backupable/backupable_db_test.cc
-        utilities/checkpoint/checkpoint_test.cc
-        utilities/document/document_db_test.cc
-        utilities/document/json_document_test.cc
-        utilities/geodb/geodb_test.cc
-        utilities/merge_operators/string_append/stringappend_test.cc
-        utilities/redis/redis_lists_test.cc
-        utilities/spatialdb/spatial_db_test.cc
-        utilities/table_properties_collectors/compact_on_deletion_collector_test.cc
-        utilities/transactions/optimistic_transaction_test.cc
-        utilities/ttl/ttl_test.cc
-        utilities/write_batch_with_index/write_batch_with_index_test.cc
-)
-
-set(EXES ${APPS} ${TESTS})
-
-foreach(sourcefile ${EXES})
-    string(REPLACE ".cc" "" exename ${sourcefile})
-    string(REPLACE ".c" "" exename ${exename})
-    string(REGEX REPLACE "^((.+)/)+" "" exename ${exename})
-    add_executable(${exename}${ARTIFACT_SUFFIX} ${sourcefile})
-    target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${LIBS})
-endforeach(sourcefile ${EXES})
@@ -1,16 +0,0 @@
-## RocksDB dump format
-
-The version 1 RocksDB dump format is fairly simple:
-
-1) The dump starts with the magic 8 byte identifier "ROCKDUMP"
-
-2) The magic is followed by an 8 byte big-endian version which is 0x00000001.
-
-3) Next are arbitrarily sized chunks of bytes prepended by 4 byte little endian number indicating how large each chunk is.
-
-4) The first chunk is special and is a json string indicating some things about the creation of this dump.  It contains the following keys:
-* database-path: The path of the database this dump was created from.
-* hostname: The hostname of the machine where the dump was created.
-* creation-time: Unix seconds since epoc when this dump was created.
-
-5) Following the info dump the slices paired into are key/value pairs.
@@ -1,128 +1,7 @@
 # Rocksdb Change Log

-## 3.13.0 (8/6/2015)
-### New Features
-* RollbackToSavePoint() in WriteBatch/WriteBatchWithIndex
-* Add NewCompactOnDeletionCollectorFactory() in utilities/table_properties_collectors, which allows rocksdb to mark a SST file as need-compaction when it observes at least D deletion entries in any N consecutive entries in that SST file.  Note that this feature depends on an experimental NeedCompact() API --- the result of this API will not persist after DB restart.
-* Add DBOptions::delete_scheduler. Use NewDeleteScheduler() in include/rocksdb/delete_scheduler.h to create a DeleteScheduler that can be shared among multiple RocksDB instances to control the file deletion rate of SST files that exist in the first db_path.
+## Unreleased

-### Public API Changes
-* Deprecated WriteOptions::timeout_hint_us. We no longer support write timeout. If you really need this option, talk to us and we might consider returning it.
-* Deprecated purge_redundant_kvs_while_flush option.
-* Removed BackupEngine::NewBackupEngine() and NewReadOnlyBackupEngine() that were deprecated in RocksDB 3.8. Please use BackupEngine::Open() instead.
-* Deprecated Compaction Filter V2. We are not aware of any existing use-cases. If you use this filter, your compile will break with RocksDB 3.13. Please let us know if you use it and we'll put it back in RocksDB 3.14.
-* Env::FileExists now returns a Status instead of a boolean
-* Add statistics::getHistogramString() to print detailed distribution of a histogram metric.
-* Add DBOptions::skip_stats_update_on_db_open.  When it is on, DB::Open() will run faster as it skips the random reads required for loading necessary stats from SST files to optimize compaction.
-
-## 3.12.0 (7/2/2015)
-### New Features
-* Added experimental support for optimistic transactions.  See include/rocksdb/utilities/optimistic_transaction.h for more info.
-* Added a new way to report QPS from db_bench (check out --report_file and --report_interval_seconds)
-* Added a cache for individual rows. See DBOptions::row_cache for more info.
-* Several new features on EventListener (see include/rocksdb/listener.h):
- - OnCompationCompleted() now returns per-compaciton job statistics, defined in include/rocksdb/compaction_job_stats.h.
- - Added OnTableFileCreated() and OnTableFileDeleted().
-* Add compaction_options_universal.enable_trivial_move to true, to allow trivial move while performing universal compaction. Trivial move will happen only when all the input files are non overlapping.
-
-### Public API changes
-* EventListener::OnFlushCompleted() now passes FlushJobInfo instead of a list of parameters.
-* DB::GetDbIdentity() is now a const function.  If this function is overridden in your application, be sure to also make GetDbIdentity() const to avoid compile error.
-* Move listeners from ColumnFamilyOptions to DBOptions.
-* Add max_write_buffer_number_to_maintain option
-* DB::CompactRange()'s parameter reduce_level is changed to change_level, to allow users to move levels to lower levels if allowed. It can be used to migrate a DB from options.level_compaction_dynamic_level_bytes=false to options.level_compaction_dynamic_level_bytes.true.
-* Change default value for options.compaction_filter_factory and options.compaction_filter_factory_v2 to nullptr instead of DefaultCompactionFilterFactory and DefaultCompactionFilterFactoryV2.
-* If CancelAllBackgroundWork is called without doing a flush after doing loads with WAL disabled, the changes which haven't been flushed before the call to CancelAllBackgroundWork will be lost.
-* WBWIIterator::Entry() now returns WriteEntry instead of `const WriteEntry&`
-* options.hard_rate_limit is deprecated.
-* When options.soft_rate_limit or options.level0_slowdown_writes_trigger is triggered, the way to slow down writes is changed to: write rate to DB is limited to to options.delayed_write_rate.
-* DB::GetApproximateSizes() adds a parameter to allow the estimation to include data in mem table, with default to be not to include. It is now only supported in skip list mem table.
-* DB::CompactRange() now accept CompactRangeOptions instead of multiple paramters. CompactRangeOptions is defined in include/rocksdb/options.h.
-* CompactRange() will now skip bottommost level compaction for level based compaction if there is no compaction filter, bottommost_level_compaction is introduced in CompactRangeOptions to control when it's possbile to skip bottommost level compaction. This mean that if you want the compaction to produce a single file you need to set bottommost_level_compaction to BottommostLevelCompaction::kForce.
-* Add Cache.GetPinnedUsage() to get the size of memory occupied by entries that are in use by the system.
-* DB:Open() will fail if the compression specified in Options is not linked with the binary. If you see this failure, recompile RocksDB with compression libraries present on your system. Also, previously our default compression was snappy. This behavior is now changed. Now, the default compression is snappy only if it's available on the system. If it isn't we change the default to kNoCompression.
-* We changed how we account for memory used in block cache. Previously, we only counted the sum of block sizes currently present in block cache. Now, we count the actual memory usage of the blocks. For example, a block of size 4.5KB will use 8KB memory with jemalloc. This might decrease your memory usage and possibly decrease performance. Increase block cache size if you see this happening after an upgrade.
-* Add BackupEngineImpl.options_.max_background_operations to specify the maximum number of operations that may be performed in parallel. Add support for parallelized backup and restore.
-* Add DB::SyncWAL() that does a WAL sync without blocking writers.
-
-## 3.11.0 (5/19/2015)
-### New Features
-* Added a new API Cache::SetCapacity(size_t capacity) to dynamically change the maximum configured capacity of the cache. If the new capacity is less than the existing cache usage, the implementation will try to lower the usage by evicting the necessary number of elements following a strict LRU policy.
-* Added an experimental API for handling flashcache devices (blacklists background threads from caching their reads) -- NewFlashcacheAwareEnv
-* If universal compaction is used and options.num_levels > 1, compact files are tried to be stored in none-L0 with smaller files based on options.target_file_size_base. The limitation of DB size when using universal compaction is greatly mitigated by using more levels. You can set num_levels = 1 to make universal compaction behave as before. If you set num_levels > 1 and want to roll back to a previous version, you need to compact all files to a big file in level 0 (by setting target_file_size_base to be large and CompactRange(<cf_handle>, nullptr, nullptr, true, 0) and reopen the DB with the same version to rewrite the manifest, and then you can open it using previous releases.
-* More information about rocksdb background threads are available in Env::GetThreadList(), including the number of bytes read / written by a compaction job, mem-table size and current number of bytes written by a flush job and many more.  Check include/rocksdb/thread_status.h for more detail.
-
-### Public API changes
-* TablePropertiesCollector::AddUserKey() is added to replace TablePropertiesCollector::Add(). AddUserKey() exposes key type, sequence number and file size up to now to users.
-* DBOptions::bytes_per_sync used to apply to both WAL and table files. As of 3.11 it applies only to table files. If you want to use this option to sync WAL in the background, please use wal_bytes_per_sync
-
-## 3.10.0 (3/24/2015)
-### New Features
-* GetThreadStatus() is now able to report detailed thread status, including:
- - Thread Operation including flush and compaction.
- - The stage of the current thread operation.
- - The elapsed time in micros since the current thread operation started.
- More information can be found in include/rocksdb/thread_status.h.  In addition, when running db_bench with --thread_status_per_interval, db_bench will also report thread status periodically.
-* Changed the LRU caching algorithm so that referenced blocks (by iterators) are never evicted. This change made parameter removeScanCountLimit obsolete. Because of that NewLRUCache doesn't take three arguments anymore. table_cache_remove_scan_limit option is also removed
-* By default we now optimize the compilation for the compilation platform (using -march=native). If you want to build portable binary, use 'PORTABLE=1' before the make command.
-* We now allow level-compaction to place files in different paths by
-  specifying them in db_paths along with the target_size.
-  Lower numbered levels will be placed earlier in the db_paths and higher
-  numbered levels will be placed later in the db_paths vector.
-* Potentially big performance improvements if you're using RocksDB with lots of column families (100-1000)
-* Added BlockBasedTableOptions.format_version option, which allows user to specify which version of block based table he wants. As a general guidline, newer versions have more features, but might not be readable by older versions of RocksDB.
-* Added new block based table format (version 2), which you can enable by setting BlockBasedTableOptions.format_version = 2. This format changes how we encode size information in compressed blocks and should help with memory allocations if you're using Zlib or BZip2 compressions.
-* MemEnv (env that stores data in memory) is now available in default library build. You can create it by calling NewMemEnv().
-* Add SliceTransform.SameResultWhenAppended() to help users determine it is safe to apply prefix bloom/hash.
-* Block based table now makes use of prefix bloom filter if it is a full fulter.
-* Block based table remembers whether a whole key or prefix based bloom filter is supported in SST files. Do a sanity check when reading the file with users' configuration.
-* Fixed a bug in ReadOnlyBackupEngine that deleted corrupted backups in some cases, even though the engine was ReadOnly
-* options.level_compaction_dynamic_level_bytes, a feature to allow RocksDB to pick dynamic base of bytes for levels. With this feature turned on, we will automatically adjust max bytes for each level. The goal of this feature is to have lower bound on size amplification. For more details, see comments in options.h.
-* Added an abstract base class WriteBatchBase for write batches
-* Fixed a bug where we start deleting files of a dropped column families even if there are still live references to it
-
-### Public API changes
-* Deprecated skip_log_error_on_recovery and table_cache_remove_scan_count_limit options.
-* Logger method logv with log level parameter is now virtual
-
-### RocksJava
-* Added compression per level API.
-* MemEnv is now available in RocksJava via RocksMemEnv class.
-* lz4 compression is now included in rocksjava static library when running `make rocksdbjavastatic`.
-* Overflowing a size_t when setting rocksdb options now throws an IllegalArgumentException, which removes the necessity for a developer to catch these Exceptions explicitly.
-
-## 3.9.0 (12/8/2014)
-
-### New Features
-* Add rocksdb::GetThreadList(), which in the future will return the current status of all
-  rocksdb-related threads.  We will have more code instruments in the following RocksDB
-  releases.
-* Change convert function in rocksdb/utilities/convenience.h to return Status instead of boolean.
-  Also add support for nested options in convert function
-
-### Public API changes
-* New API to create a checkpoint added. Given a directory name, creates a new
-  database which is an image of the existing database.
-* New API LinkFile added to Env. If you implement your own Env class, an
-  implementation of the API LinkFile will have to be provided.
-* MemTableRep takes MemTableAllocator instead of Arena
-
-### Improvements
-* RocksDBLite library now becomes smaller and will be compiled with -fno-exceptions flag.
-
-## 3.8.0 (11/14/2014)
-
-### Public API changes
-* BackupEngine::NewBackupEngine() was deprecated; please use BackupEngine::Open() from now on.
-* BackupableDB/RestoreBackupableDB have new GarbageCollect() methods, which will clean up files from corrupt and obsolete backups.
-* BackupableDB/RestoreBackupableDB have new GetCorruptedBackups() methods which list corrupt backups.
-
-### Cleanup
-* Bunch of code cleanup, some extra warnings turned on (-Wshadow, -Wshorten-64-to-32, -Wnon-virtual-dtor)
-
-### New features
-* CompactFiles and EventListener, although they are still in experimental state
-* Full ColumnFamily support in RocksJava.

 ## 3.7.0 (11/6/2014)
 ### Public API changes
@@ -2,7 +2,7 @@

 RocksDB's library should be able to compile without any dependency installed,
 although we recommend installing some compression libraries (see below).
-We do depend on newer gcc/clang with C++11 support.
+We do depend on newer gcc with C++11 support.

 There are few options when compiling RocksDB:

@@ -15,9 +15,9 @@ There are few options when compiling RocksDB:
 * `make all` will compile our static library, and all our tools and unit tests. Our tools
 depend on gflags. You will need to have gflags installed to run `make all`.

-* By default the binary we produce is optimized for the platform you're compiling on
-(-march=native). If you want to build a portable binary, add 'PORTABLE=1' before
-your make commands, like this: `PORTABLE=1 make static_lib`
+* if Intel SSE instruction set is supported, set USE_SSE=" -msse -msse4.2 " to make sure
+SSE4.2 is used to speed up CRC32 when calculating data checksum.
+

 ## Dependencies

@@ -28,7 +28,7 @@ your make commands, like this: `PORTABLE=1 make static_lib`
      data compression.

 * All our tools depend on:
-  - [gflags](https://gflags.github.io/gflags/) - a library that handles
+  - [gflags](https://code.google.com/p/gflags/) - a library that handles
      command line flags processing. You can compile rocksdb library even
      if you don't have gflags installed.

@@ -75,11 +75,14 @@ your make commands, like this: `PORTABLE=1 make static_lib`
        * Update XCode:  run `xcode-select --install` (or install it from XCode App's settting).
        * Install via [homebrew](http://brew.sh/).
            * If you're first time developer in MacOS, you still need to run: `xcode-select --install` in your command line.
-            * run `brew tap homebrew/versions; brew install gcc47 --use-llvm` to install gcc 4.7 (or higher).
-    * run `brew install rocksdb`
+            * run `brew tap homebrew/dupes; brew install gcc47 --use-llvm` to install gcc 4.7 (or higher).
+    * Install zlib, bzip2 and snappy libraries for compression.
+    * Install gflags. We have included a script
+    `build_tools/mac-install-gflags.sh`, which should automatically install it (execute this file instead of runing using "source" command).
+    If you installed gflags by other means (for example, `brew install gflags`),
+    please set `LIBRARY_PATH` and `CPATH` accordingly.
+    * Please note that some of the optimizations/features are disabled in OSX.
+    We did not run any production workloads on it.

 * **iOS**:
  * Run: `TARGET_OS=IOS make static_lib`. When building the project which uses rocksdb iOS library, make sure to define two important pre-processing macros: `ROCKSDB_LITE` and `IOS_CROSS_COMPILE`.
-
-* **Windows**:
-  * Read the follow the instructions at CMakeLists.txt
@@ -1,33 +1,23 @@
-Additional Grant of Patent Rights Version 2
+Additional Grant of Patent Rights

-"Software" means the RocksDB software distributed by Facebook, Inc.
+“Software” means the rocksdb software distributed by Facebook, Inc.

-Facebook, Inc. ("Facebook") hereby grants to each recipient of the Software
-("you") a perpetual, worldwide, royalty-free, non-exclusive, irrevocable
-(subject to the termination provision below) license under any Necessary
-Claims, to make, have made, use, sell, offer to sell, import, and otherwise
-transfer the Software. For avoidance of doubt, no license is granted under
-Facebook’s rights in any patent claims that are infringed by (i) modifications
-to the Software made by you or any third party or (ii) the Software in
-combination with any software or other technology.
+Facebook hereby grants you a perpetual, worldwide, royalty-free,
+non-exclusive, irrevocable (subject to the termination provision below)
+license under any rights in any patent claims owned by Facebook, to make,
+have made, use, sell, offer to sell, import, and otherwise transfer the
+Software. For avoidance of doubt, no license is granted under Facebook’s
+rights in any patent claims that are infringed by (i) modifications to the
+Software made by you or a third party, or (ii) the Software in combination
+with any software or other technology provided by you or a third party.

-The license granted hereunder will terminate, automatically and without notice,
-if you (or any of your subsidiaries, corporate affiliates or agents) initiate
-directly or indirectly, or take a direct financial interest in, any Patent
-Assertion: (i) against Facebook or any of its subsidiaries or corporate
-affiliates, (ii) against any party if such Patent Assertion arises in whole or
-in part from any software, technology, product or service of Facebook or any of
-its subsidiaries or corporate affiliates, or (iii) against any party relating
-to the Software. Notwithstanding the foregoing, if Facebook or any of its
-subsidiaries or corporate affiliates files a lawsuit alleging patent
-infringement against you in the first instance, and you respond by filing a
-patent infringement counterclaim in that lawsuit against that party that is
-unrelated to the Software, the license granted hereunder will not terminate
-under section (i) of this paragraph due to such counterclaim.
-
-A "Necessary Claim" is a claim of a patent owned by Facebook that is
-necessarily infringed by the Software standing alone.
-
-A "Patent Assertion" is any lawsuit or other action alleging direct, indirect,
-or contributory infringement or inducement to infringe any patent, including a
-cross-claim or counterclaim.
+The license granted hereunder will terminate, automatically and without
+notice, for anyone that makes any claim (including by filing any lawsuit,
+assertion or other action) alleging (a) direct, indirect, or contributory
+infringement or inducement to infringe any patent: (i) by Facebook or any
+of its subsidiaries or affiliates, whether or not such claim is related
+to the Software, (ii) by any party if such claim arises in whole or in
+part from any software, product or service of Facebook or any of its
+subsidiaries or affiliates, whether or not such claim is related to the
+Software, or (iii) by any party relating to the Software; or (b) that
+any right in any patent claim of Facebook is invalid or unenforceable.
@@ -8,7 +8,6 @@ Some examples of the features disabled by ROCKSDB_LITE:
 * No support for replication (which we provide in form of TrasactionalIterator)
 * No advanced monitoring tools
 * No special-purpose memtables that are highly optimized for specific use cases
-* No Transactions

 When adding a new big feature to RocksDB, please add ROCKSDB_LITE compile guard if:
 * Nobody from mobile really needs your feature,
@@ -1,36 +0,0 @@
-This document lists users of RocksDB and their use cases. If you are using RocksDB, please open a pull request and add yourself to the list.
-
-## Facebook
-At Facebook, we use RocksDB as a backend for many different stateful services. We're also experimenting with running RocksDB as a storage engine for two databases:
-
-1. MyRocks -- https://github.com/MySQLOnRocksDB/mysql-5.6
-2. MongoRocks -- https://github.com/mongodb-partners/mongo-rocks
-
-## LinkedIn
-Two different use cases at Linkedin are using RocksDB as a storage engine:
-
-1. LinkedIn's follow feed for storing user's activities
-2. Apache Samza, open source framework for stream processing
-
-Learn more about those use cases in a Tech Talk by Ankit Gupta and Naveen Somasundaram: http://www.youtube.com/watch?v=plqVp_OnSzg
-
-## Yahoo
-Yahoo is using RocksDB as a storage engine for their biggest distributed data store Sherpa. Learn more about it here: http://yahooeng.tumblr.com/post/120730204806/sherpa-scales-new-heights
-
-## CockroachDB
-CockroachDB is an open-source geo-replicated transactional database (still in development). They are using RocksDB as their storage engine. Check out their github: https://github.com/cockroachdb/cockroach
-
-## DNANexus
-DNANexus is using RocksDB to speed up processing of genomics data.
-You can learn more from this great blog post by Mike Lin: http://devblog.dnanexus.com/faster-bam-sorting-with-samtools-and-rocksdb/
-
-## Iron.io
-Iron.io is using RocksDB as a storage engine for their distributed queueing system.
-Learn more from Tech Talk by Reed Allman: http://www.youtube.com/watch?v=HTjt6oj-RL4
-
-## Tango Me
-Tango is using RocksDB as a graph storage to store all users' connection data and other social activity data.
-
-## Turn
-Turn is using RocksDB as a storage layer for their key/value store, serving at peak 2.4MM QPS out of different datacenters.
-Check out our RocksDB Protobuf merge operator at: https://github.com/vladb38/rocksdb_protobuf
@@ -13,21 +13,4 @@ Vagrant.configure("2") do |config|
    box.vm.box = "chef/centos-6.5"
  end

-  config.vm.define "FreeBSD10" do |box|
-    box.vm.guest = :freebsd
-    box.vm.box = "robin/freebsd-10"
-    # FreeBSD does not support 'mount_virtualbox_shared_folder', use NFS
-    box.vm.synced_folder ".", "/vagrant", :nfs => true, id: "vagrant-root"
-    box.vm.network "private_network", ip: "10.0.1.10"
-
-    # build everything after creating VM, skip using --no-provision
-    box.vm.provision "shell", inline: <<-SCRIPT
-      pkg install -y gmake clang35
-      export CXX=/usr/local/bin/clang++35
-      cd /vagrant
-      gmake clean
-      gmake all OPT=-g
-    SCRIPT
-  end
-
 end
@@ -1,228 +0,0 @@
-# Microsoft Contribution Notes
-
-## Contributors
-* Alexander Zinoviev https://github.com/zinoale
-* Dmitri Smirnov https://github.com/yuslepukhin
-* Praveen Rao  https://github.com/PraveenSinghRao
-* Sherlock Huang  https://github.com/SherlockNoMad
-
-## Introduction
-RocksDB is a well proven open source key-value persistent store, optimized for fast storage. It provides scalability with number of CPUs and storage IOPS, to support IO-bound, in-memory and write-once workloads, most importantly, to be flexible to allow for innovation.
-
-As Microsoft Bing team we have been continuously pushing hard to improve the scalability, efficiency of platform and eventually benefit Bing end-user satisfaction.  We would like to explore the opportunity to embrace open source, RocksDB here, to use, enhance and customize for our usage, and also contribute back to the RocksDB community. Herein, we are pleased to offer this RocksDB port for Windows platform.
-
-These notes describe some decisions and changes we had to make with regards to porting RocksDB on Windows. We hope this will help both reviewers and users of the Windows port.
-We are open for comments and improvements.
-
-## OS specifics
-All of the porting, testing and benchmarking was done on Windows Server 2012 R2 Datacenter 64-bit but to the best of our knowledge there is not a specific API we used during porting that is unsupported on other Windows OS after Vista.
-
-## Porting goals
-We strive to achieve the following goals:
-* make use of the existing porting interface of RocksDB
-* make minimum [WY2]modifications within platform independent code.
-* make all unit test pass both in debug and release builds. 
-  * Note: latest introduction of SyncPoint seems to disable running db_test in Release.
-* make performance on par with published benchmarks accounting for HW differences
-* we would like to keep the port code inline with the master branch with no forking
-
-## Build system
-We have chosen CMake as a widely accepted build system to build the Windows port. It is very fast and convenient. 
-
-At the same time it generates Visual Studio projects that are both usable from a command line and IDE.
-
-The top-level CMakeLists.txt file contains description of all targets and build rules. It also provides brief instructions on how to build the software for Windows. One more build related file is thirdparty.inc that also resides on the top level. This file must be edited to point to actual third party libraries location.
-We think that it would be beneficial to merge the existing make-based build system and the new cmake-based build system into a single one to use on all platforms.
-
-All building and testing was done for 64-bit. We have not conducted any testing for 32-bit and early reports indicate that it will not run on 32-bit.
-
-## C++ and STL notes
-We had to make some minimum changes within the portable files that either account for OS differences or the shortcomings of C++11 support in the current version of the MS compiler. Most or all of them are expected to be fixed in the upcoming compiler releases.
-
-We plan to use this port for our business purposes here at Bing and this provided business justification for this port. This also means, we do not have at present to choose the compiler version at will.
-
-* Certain headers that are not present and not necessary on Windows were simply `#ifndef OS_WIN` in a few places (`unistd.h`)
-* All posix specific headers were replaced to port/port.h which worked well
-* Replaced `dirent.h` for `port/dirent.h` (very few places) with the implementation of the relevant interfaces within `rocksdb::port` namespace
-* Replaced `sys/time.h` to `port/sys_time.h` (few places) implemented equivalents within `rocksdb::port`
-* `printf %z` specification is not supported on Windows. To imitate existing standards we came up with a string macro `ROCKSDB_PRIszt` which expands to `%z` on posix systems and to Iu on windows.
-* in class member initialization were moved to a __ctors in some cases
-* `constexpr` is not supported. We had to replace `std::numeric_limits<>::max/min()` to its C macros for constants. Sometimes we had to make class members `static const` and place a definition within a .cc file.
-* `constexpr` for functions was replaced to a template specialization (1 place)
-* Union members that have non-trivial constructors were replaced to `char[]` in one place along with bug fixes (spatial experimental feature)
-* Zero-sized arrays are deemed a non-standard extension which we converted to 1 size array and that should work well for the purposes of these classes.
-* `std::chrono` lacks nanoseconds support (fixed in the upcoming release of the STL) and we had to use `QueryPerfCounter()` within env_win.cc
-* Function local statics initialization is still not safe. Used `std::once` to mitigate within WinEnv.
-
-## Windows Environments notes
-We endeavored to make it functionally on par with posix_env. This means we replicated the functionality of the thread pool and other things as precise as possible, including:
-* Replicate posix logic using std:thread primitives.
-* Implement all posix_env disk access functionality.
-* Set `use_os_buffer=false` to disable OS disk buffering for WinWritableFile and WinRandomAccessFile.
-* Replace `pread/pwrite` with `WriteFile/ReadFile` with `OVERLAPPED` structure.
-* Use `SetFileInformationByHandle` to compensate absence of `fallocate`.
-
-### In detail
-Even though Windows provides its own efficient thread-pool implementation we chose to replicate posix logic using `std::thread` primitives. This allows anyone to quickly detect any changes within the posix source code and replicate them within windows env. This has proven to work very well. At the same time for anyone who wishes to replace the built-in thread-pool can do so using RocksDB stackable environments.
-
-For disk access we implemented all of the functionality present within the posix_env which includes memory mapped files, random access, rate-limiter support etc.
-The `use_os_buffer` flag on Posix platforms currently denotes disabling read-ahead log via `fadvise` mechanism. Windows does not have `fadvise` system call. What is more, it implements disk cache in a way that differs from Linux greatly. It’s not an uncommon practice on Windows to perform un-buffered disk access to gain control of the memory consumption. We think that in our use case this may also be a good configuration option at the expense of disk throughput. To compensate one may increase the configured in-memory cache size instead. Thus we have chosen  `use_os_buffer=false` to disable OS disk buffering for `WinWritableFile` and `WinRandomAccessFile`. The OS imposes restrictions on the alignment of the disk offsets, buffers used and the amount of data that is read/written when accessing files in un-buffered mode. When the option is true, the classes behave in a standard way. This allows to perform writes and reads in cases when un-buffered access does not make sense such as WAL and MANIFEST.
-
-We have replaced `pread/pwrite` with `WriteFile/ReadFile` with `OVERLAPPED` structure so we can atomically seek to the position of the disk operation but still perform the operation synchronously. Thus we able to emulate that functionality of `pread/pwrite` reasonably well. The only difference is that the file pointer is not returned to its original position but that hardly matters given the random nature of access.
-
-We used `SetFileInformationByHandle` both to truncate files after writing a full final page to disk and to pre-allocate disk space for faster I/O thus compensating for the absence of `fallocate` although some differences remain. For example, the pre-allocated space is not filled with zeros like on Linux, however, on a positive note, the end of file position is also not modified after pre-allocation.
-
-RocksDB renames, copies and deletes files at will even though they may be opened with another handle at the same time. We had to relax and allow nearly all the concurrent access permissions possible.
-
-## Thread-Local Storage
-Thread-Local storage plays a significant role for RocksDB performance. Rather than creating a separate implementation we chose to create inline wrappers that forward `pthread_specific` calls to Windows `Tls` interfaces within `rocksdb::port` namespace. This leaves the existing meat of the logic in tact and unchanged and just as maintainable.
-
-To mitigate the lack of thread local storage cleanup on thread-exit we added a limited amount of windows specific code within the same thread_local.cc file that injects a cleanup callback into a `"__tls"` structure within `".CRT$XLB"` data segment. This approach guarantees that the callback is invoked regardless of whether RocksDB used within an executable, standalone DLL or within another DLL.
-
-## Jemalloc usage
-
-When RocksDB is used with Jemalloc the latter needs to be initialized before any of the C++ globals or statics. To accomplish that we injected an initialization routine into `".CRT$XCT"` that is automatically invoked by the runtime before initializing static objects. je-uninit is queued to `atexit()`. 
-
-The jemalloc redirecting `new/delete` global operators are used by the linker providing certain conditions are met. See build section in these notes.
-
-## Stack Trace and Unhandled Exception Handler
-
-We decided not to implement these two features because the hosting program as a rule has these two things in it.
-We experienced no inconveniences debugging issues in the debugger or analyzing process dumps if need be and thus we did not
-see this as a priority.
-
-## Performance results
-### Setup
-All of the benchmarks are run on the same set of machines. Here are the details of the test setup:
-* 2 Intel(R) Xeon(R) E5 2450 0 @ 2.10 GHz (total 16 cores)
-* 2 XK0480GDQPH SSD Device, total 894GB free disk
-* Machine has 128 GB of RAM
-* Operating System: Windows Server 2012 R2 Datacenter
-* 100 Million keys; each key is of size 10 bytes, each value is of size 800 bytes
-* total database size is ~76GB
-* The performance result is based on RocksDB 3.11.
-* The parameters used, unless specified, were exactly the same as published in the GitHub Wiki page. 
-
-### RocksDB on flash storage
-
-#### Test 1. Bulk Load of keys in Random Order
-
-Version 3.11 
-
-* Total Run Time: 17.6 min
-* Fillrandom: 5.480 micros/op 182465 ops/sec;  142.0 MB/s
-* Compact: 486056544.000 micros/op 0 ops/sec
-
-Version 3.10 
-
-* Total Run Time: 16.2 min 
-* Fillrandom: 5.018 micros/op 199269 ops/sec;  155.1 MB/s 
-* Compact: 441313173.000 micros/op 0 ops/sec; 
-
-
-#### Test 2. Bulk Load of keys in Sequential Order
-
-Version 3.11 
-
-* Fillseq: 4.944 micros/op 202k ops/sec;  157.4 MB/s
-
-Version 3.10
-
-* Fillseq: 4.105 micros/op 243.6k ops/sec;  189.6 MB/s 
-
-
-#### Test 3. Random Write
-
-Version 3.11 
-
-* Unbuffered I/O enabled
-* Overwrite: 52.661 micros/op 18.9k ops/sec;   14.8 MB/s
-
-Version 3.10
-
-* Unbuffered I/O enabled 
-* Overwrite: 52.661 micros/op 18.9k ops/sec; 
-
-
-#### Test 4. Random Read
-
-Version 3.11 
-
-* Unbuffered I/O enabled
-* Readrandom: 15.716 micros/op 63.6k ops/sec; 49.5 MB/s 
-
-Version 3.10
-
-* Unbuffered I/O enabled 
-* Readrandom: 15.548 micros/op 64.3k ops/sec; 
-
-
-#### Test 5. Multi-threaded read and single-threaded write
-
-Version 3.11
-
-* Unbuffered I/O enabled
-* Readwhilewriting: 25.128 micros/op 39.7k ops/sec; 
-
-Version 3.10
-
-* Unbuffered I/O enabled 
-* Readwhilewriting: 24.854 micros/op 40.2k ops/sec; 
-
-
-### RocksDB In Memory 
-
-#### Test 1. Point Lookup
-
-Version 3.11
-
-80K writes/sec
-* Write Rate Achieved: 40.5k write/sec;
-* Readwhilewriting: 0.314 micros/op 3187455 ops/sec;  364.8 MB/s (715454999 of 715454999 found)
-
-Version 3.10
-
-* Write Rate Achieved:  50.6k write/sec 
-* Readwhilewriting: 0.316 micros/op 3162028 ops/sec; (719576999 of 719576999 found) 
-
-
-*10K writes/sec*
-
-Version 3.11
-
-* Write Rate Achieved: 5.8k/s write/sec
-* Readwhilewriting: 0.246 micros/op 4062669 ops/sec;  464.9 MB/s (915481999 of 915481999 found)
-
-Version 3.10
-
-* Write Rate Achieved: 5.8k/s write/sec 
-* Readwhilewriting: 0.244 micros/op 4106253 ops/sec; (927986999 of 927986999 found) 
-
-
-#### Test 2. Prefix Range Query
-
-Version 3.11
-
-80K writes/sec
-* Write Rate Achieved:  46.3k/s write/sec
-* Readwhilewriting: 0.362 micros/op 2765052 ops/sec;  316.4 MB/s (611549999 of 611549999 found)
-
-Version 3.10
-
-* Write Rate Achieved: 45.8k/s write/sec 
-* Readwhilewriting: 0.317 micros/op 3154941 ops/sec; (708158999 of 708158999 found) 
-
-Version 3.11
-
-10K writes/sec
-* Write Rate Achieved: 5.78k write/sec
-* Readwhilewriting: 0.269 micros/op 3716692 ops/sec;  425.3 MB/s (837401999 of 837401999 found)
-
-Version 3.10
-
-* Write Rate Achieved: 5.7k write/sec 
-* Readwhilewriting: 0.261 micros/op 3830152 ops/sec; (863482999 of 863482999 found) 
-
-
-We think that there is still big room to improve the performance, which will be an ongoing effort for us.
-
@@ -1,3 +0,0 @@
-<?php
-
-phutil_register_library('arcanist_util', __FILE__);
@@ -1,32 +0,0 @@
-<?php
-// Copyright 2004-present Facebook. All Rights Reserved.
-
-class FacebookArcanistConfiguration extends ArcanistConfiguration {
-
-  public function didRunWorkflow($command,
-                                 ArcanistBaseWorkflow $workflow,
-                                 $error_code) {
-    if ($command == 'diff' && !$workflow->isRawDiffSource()) {
-      $this->maybePushToJenkins($workflow);
-    }
-  }
-
-  //////////////////////////////////////////////////////////////////////
-  /* Send off builds to jenkins */
-  function maybePushToJenkins($workflow) {
-    $diffID = $workflow->getDiffID();
-    if ($diffID === null) {
-      return;
-    }
-
-    $results = $workflow->getTestResults();
-    if (!$results) {
-      return;
-    }
-
-    $url = "https://ci-builds.fb.com/view/rocksdb/job/rocksdb_diff_check/"
-               ."buildWithParameters?token=AUTH&DIFF_ID=$diffID";
-    system("curl --noproxy '*' \"$url\" > /dev/null 2>&1");
-  }
-
-}
@@ -1,18 +0,0 @@
-<?php
-// Copyright 2004-present Facebook. All Rights Reserved.
-
-class FacebookFbcodeUnitTestEngine extends ArcanistBaseUnitTestEngine {
-
-  public function run() {
-    // Here we create a new unit test "jenkins_async_test" and promise we'll
-    // update the results later.
-    // Jenkins updates the results using `arc call-conduit
-    // differential.updateunitresults` call. If you change the name here, also
-    // make sure to change the name in Jenkins script that updates the test
-    // result -- they have to be the same.
-    $result = new ArcanistUnitTestResult();
-    $result->setName("jenkins_async_test");
-    $result->setResult(ArcanistUnitTestResult::RESULT_POSTPONED);
-    return array($result);
-  }
-}
@@ -8,7 +8,6 @@
 #   CXX                         C++ Compiler path
 #   PLATFORM_LDFLAGS            Linker flags
 #   JAVA_LDFLAGS                Linker flags for RocksDBJava
-#   JAVA_STATIC_LDFLAGS         Linker flags for RocksDBJava static build
 #   PLATFORM_SHARED_EXT         Extension for shared libraries
 #   PLATFORM_SHARED_LDFLAGS     Flags for building shared library
 #   PLATFORM_SHARED_CFLAGS      Flags for compiling objects for shared library
@@ -33,7 +32,7 @@
 #   2. Once install, add the include path/lib path for gflags to CPATH and
 #      LIBRARY_PATH respectively. If installed with default mode, the
 #      lib and include path will be /usr/local/lib and /usr/local/include
-# Mac user can do this by having brew installed and running brew install gflags
+# Mac user can do this by running build_tools/mac-install-gflags.sh

 OUTPUT=$1
 if test -z "$OUTPUT"; then
@@ -49,8 +48,6 @@ COMMON_FLAGS="-DROCKSDB_PLATFORM_POSIX"
 # Default to fbcode gcc on internal fb machines
 if [ -z "$ROCKSDB_NO_FBCODE" -a -d /mnt/gvfs/third-party ]; then
    FBCODE_BUILD="true"
-    # If we're compiling with TSAN we need pic build
-    PIC_BUILD=$COMPILE_WITH_TSAN
    source "$PWD/build_tools/fbcode_config.sh"
 fi

@@ -71,26 +68,15 @@ if test -z "$TARGET_OS"; then
    TARGET_OS=`uname -s`
 fi

-if test -z "$TARGET_ARCHITECTURE"; then
-    TARGET_ARCHITECTURE=`uname -m`
-fi
-
-if test -z "$CLANG_SCAN_BUILD"; then
-    CLANG_SCAN_BUILD=scan-build
-fi
-
-if test -z "$CLANG_ANALYZER"; then
-    CLANG_ANALYZER=$(which clang++ 2> /dev/null)
-fi
-
 COMMON_FLAGS="$COMMON_FLAGS ${CFLAGS}"
 CROSS_COMPILE=
 PLATFORM_CCFLAGS=
+PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS ${CXXFLAGS}"
 PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS"
 PLATFORM_SHARED_EXT="so"
-PLATFORM_SHARED_LDFLAGS="-Wl,--no-as-needed -shared -Wl,-soname -Wl,"
+PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
 PLATFORM_SHARED_CFLAGS="-fPIC"
-PLATFORM_SHARED_VERSIONED=true
+PLATFORM_SHARED_VERSIONED=false

 # generic port files (working on all platform by #ifdef) go directly in /port
 GENERIC_PORT_FILES=`cd "$ROCKSDB_ROOT"; find port -name '*.cc' | tr "\n" " "`
@@ -110,7 +96,6 @@ case "$TARGET_OS" in
        PLATFORM_SHARED_EXT=dylib
        PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name "
        CROSS_COMPILE=true
-        PLATFORM_SHARED_VERSIONED=
        ;;
    Linux)
        PLATFORM=OS_LINUX
@@ -151,17 +136,6 @@ case "$TARGET_OS" in
        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lpthread"
        # PORT_FILES=port/dragonfly/dragonfly_specific.cc
        ;;
-    Cygwin)
-        PLATFORM=CYGWIN
-        PLATFORM_SHARED_CFLAGS=""
-        PLATFORM_CXXFLAGS="-std=gnu++11"
-        COMMON_FLAGS="$COMMON_FLAGS -DCYGWIN"
-        if [ -z "$USE_CLANG" ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -fno-builtin-memcmp"
-        fi
-        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lpthread -lrt"
-        # PORT_FILES=port/linux/linux_specific.cc
-        ;;
    OS_ANDROID_CROSSCOMPILE)
        PLATFORM=OS_ANDROID
 	COMMON_FLAGS="$COMMON_FLAGS -fno-builtin-memcmp -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
@@ -174,9 +148,31 @@ case "$TARGET_OS" in
        exit 1
 esac

-PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS ${CXXFLAGS}"
 JAVA_LDFLAGS="$PLATFORM_LDFLAGS"
-JAVA_STATIC_LDFLAGS="$PLATFORM_LDFLAGS"
+
+if test -z "$DO_NOT_RUN_BUILD_DETECT_VERSION"; then
+  "$PWD/build_tools/build_detect_version"
+fi
+
+# We want to make a list of all cc files within util, db, table, and helpers
+# except for the test and benchmark files. By default, find will output a list
+# of all files matching either rule, so we need to append -print to make the
+# prune take effect.
+DIRS="util db table utilities"
+
+set -f # temporarily disable globbing so that our patterns arent expanded
+PRUNE_TEST="-name *test*.cc -prune"
+PRUNE_BENCH="-name *bench*.cc -prune"
+PRUNE_MOCK="-name *mock*.cc -prune"
+PORTABLE_FILES=`cd "$ROCKSDB_ROOT"; find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_MOCK -o -name '*.cc' -print | sort | tr "\n" " "`
+MOCK_SOURCES=`cd "$ROCKSDB_ROOT"; find $DIRS -name '*mock*.cc' -print | grep -v "test" | sort | tr "\n" " "`
+set +f # re-enable globbing
+
+# The sources consist of the portable files, plus the platform-specific port
+# file.
+echo "SOURCES=$PORTABLE_FILES $GENERIC_PORT_FILES $PORT_FILES" >> "$OUTPUT"
+echo "MOCK_SOURCES=$MOCK_SOURCES" >> "$OUTPUT"
+echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> "$OUTPUT"

 if [ "$CROSS_COMPILE" = "true" -o "$FBCODE_BUILD" = "true" ]; then
    # Cross-compiling; do not try any compilation tests.
@@ -186,10 +182,9 @@ else
    # Test whether fallocate is available
    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
      #include <fcntl.h>
-      #include <linux/falloc.h>
      int main() {
 	int fd = open("/dev/null", 0);
-  fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, 1024);
+	fallocate(fd, 0, 0, 1024);
      }
 EOF
    if [ "$?" = 0 ]; then
@@ -208,10 +203,11 @@ EOF
        JAVA_LDFLAGS="$JAVA_LDFLAGS -lsnappy"
    fi

+
    # Test whether gflags library is installed
    # http://code.google.com/p/gflags/
    # check if the namespace is gflags
-    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
      #include <gflags/gflags.h>
      using namespace gflags;
      int main() {}
@@ -219,17 +215,17 @@ EOF
    if [ "$?" = 0 ]; then
        COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=gflags"
        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
-    else
-      # check if namespace is google
-      $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
-        #include <gflags/gflags.h>
-        using namespace google;
-        int main() {}
+    fi
+
+    # check if namespace is google
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <gflags/gflags.h>
+      using namespace google;
+      int main() {}
 EOF
-      if [ "$?" = 0 ]; then
-          COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=google"
-          PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
-      fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=google"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
    fi

    # Test whether zlib library is installed
@@ -278,45 +274,16 @@ EOF
        JAVA_LDFLAGS="$JAVA_LDFLAGS -lnuma"
    fi

-    # Test whether jemalloc is available
-    if echo 'int main() {}' | $CXX $CFLAGS -x c++ - -o /dev/null -ljemalloc \
-      2>/dev/null; then 
-        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ljemalloc"
-        JAVA_LDFLAGS="$JAVA_LDFLAGS -ljemalloc"
-    else
-        # jemalloc is not available. Let's try tcmalloc
-        if echo 'int main() {}' | $CXX $CFLAGS -x c++ - -o /dev/null \
-          -ltcmalloc 2>/dev/null; then 
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ltcmalloc"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -ltcmalloc"
-        fi
-    fi
-
-    # Test whether malloc_usable_size is available
-    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-      #include <malloc.h>
-      int main() {
-        size_t res = malloc_usable_size(0);
-        return 0;
-      }
+    # Test whether tcmalloc is available
+    $CXX $CFLAGS -x c++ - -o /dev/null -ltcmalloc 2>/dev/null  <<EOF
+      int main() {}
 EOF
    if [ "$?" = 0 ]; then
-        COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_MALLOC_USABLE_SIZE"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ltcmalloc"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -ltcmalloc"
    fi
 fi

-# TODO(tec): Fix -Wshorten-64-to-32 errors on FreeBSD and enable the warning.
-# -Wshorten-64-to-32 breaks compilation on FreeBSD i386
-if ! [ "$TARGET_OS" = FreeBSD -a "$TARGET_ARCHITECTURE" = i386 ]; then
-  # Test whether -Wshorten-64-to-32 is available
-  $CXX $CFLAGS -x c++ - -o /dev/null -Wshorten-64-to-32 2>/dev/null  <<EOF
-    int main() {}
-EOF
-  if [ "$?" = 0 ]; then
-    COMMON_FLAGS="$COMMON_FLAGS -Wshorten-64-to-32"
-  fi
-fi
-
 # shall we use HDFS?

 if test "$USE_HDFS"; then
@@ -325,7 +292,7 @@ if test "$USE_HDFS"; then
    exit 1
  fi
  HDFS_CCFLAGS="$HDFS_CCFLAGS -I$JAVA_HOME/include -I$JAVA_HOME/include/linux -DUSE_HDFS"
-  HDFS_LDFLAGS="$HDFS_LDFLAGS -lhdfs -L$JAVA_HOME/jre/lib/amd64"
+  HDFS_LDFLAGS="$HDFS_LDFLAGS -Wl,--no-whole-archive -lhdfs -L$JAVA_HOME/jre/lib/amd64"
  HDFS_LDFLAGS="$HDFS_LDFLAGS -L$JAVA_HOME/jre/lib/amd64/server -L$GLIBC_RUNTIME_PATH/lib"
  HDFS_LDFLAGS="$HDFS_LDFLAGS -ldl -lverify -ljava -ljvm"
  COMMON_FLAGS="$COMMON_FLAGS $HDFS_CCFLAGS"
@@ -333,17 +300,8 @@ if test "$USE_HDFS"; then
  JAVA_LDFLAGS="$JAVA_LDFLAGS $HDFS_LDFLAGS"
 fi

-if [ "$TARGET_OS" = FreeBSD -a "$TARGET_ARCHITECTURE" = i386 ]; then
-  # Intel SSE instructions breaks compilation on FreeBSD i386
-  unset USE_SSE
-fi
-
-if test "$USE_SSE"; then
-  # if Intel SSE instruction set is supported, set USE_SSE=1
-  COMMON_FLAGS="$COMMON_FLAGS -msse -msse4.2 "
-elif test -z "$PORTABLE"; then
-  COMMON_FLAGS="$COMMON_FLAGS -march=native "
-fi
+# if Intel SSE instruction set is supported, set USE_SSE=" -msse -msse4.2 "
+COMMON_FLAGS="$COMMON_FLAGS $USE_SSE"

 PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
 PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
@@ -359,7 +317,6 @@ echo "CXX=$CXX" >> "$OUTPUT"
 echo "PLATFORM=$PLATFORM" >> "$OUTPUT"
 echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> "$OUTPUT"
 echo "JAVA_LDFLAGS=$JAVA_LDFLAGS" >> "$OUTPUT"
-echo "JAVA_STATIC_LDFLAGS=$JAVA_STATIC_LDFLAGS" >> "$OUTPUT"
 echo "VALGRIND_VER=$VALGRIND_VER" >> "$OUTPUT"
 echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> "$OUTPUT"
 echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> "$OUTPUT"
@@ -373,5 +330,3 @@ echo "JEMALLOC_LIB=$JEMALLOC_LIB" >> "$OUTPUT"
 echo "ROCKSDB_MAJOR=$ROCKSDB_MAJOR" >> "$OUTPUT"
 echo "ROCKSDB_MINOR=$ROCKSDB_MINOR" >> "$OUTPUT"
 echo "ROCKSDB_PATCH=$ROCKSDB_PATCH" >> "$OUTPUT"
-echo "CLANG_SCAN_BUILD=$CLANG_SCAN_BUILD" >> "$OUTPUT"
-echo "CLANG_ANALYZER=$CLANG_ANALYZER" >> "$OUTPUT"
@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+# Record the version of the source that we are compiling.
+# We keep a record of the git revision in util/version.cc. This source file
+# is then built as a regular source file as part of the compilation process.
+# One can run "strings executable_filename | grep _build_" to find the version of
+# the source that we used to build the executable file.
+
+OUTFILE="$PWD/util/build_version.cc"
+
+GIT_SHA=""
+if command -v git >/dev/null 2>&1; then
+    GIT_SHA=$(git rev-parse HEAD 2>/dev/null)
+fi
+
+cat > "${OUTFILE}" <<EOF
+#include "build_version.h"
+const char* rocksdb_build_git_sha = "rocksdb_build_git_sha:${GIT_SHA}";
+const char* rocksdb_build_git_datetime = "rocksdb_build_git_datetime:$(date)";
+const char* rocksdb_build_compile_date = __DATE__;
+const char* rocksdb_build_compile_time = __TIME__;
+EOF
@@ -1,2 +0,0 @@
-#!/bin/bash
-docker run -v $PWD:/rocks -w /rocks buildpack-deps make
@@ -1,55 +0,0 @@
-#!/bin/sh
-
-# fail early
-set -e
-
-if test -z $ROCKSDB_PATH; then
-  ROCKSDB_PATH=~/rocksdb
-fi
-source $ROCKSDB_PATH/build_tools/fbcode_config4.8.1.sh
-
-EXTRA_LDFLAGS=""
-
-if test -z $ALLOC; then
-  # default
-  ALLOC=tcmalloc
-elif [[ $ALLOC == "jemalloc" ]]; then
-  ALLOC=system
-  EXTRA_LDFLAGS+=" -Wl,--whole-archive $JEMALLOC_LIB -Wl,--no-whole-archive"
-fi
-
-# we need to force mongo to use static library, not shared
-STATIC_LIB_DEP_DIR='build/static_library_dependencies'
-test -d $STATIC_LIB_DEP_DIR || mkdir $STATIC_LIB_DEP_DIR
-test -h $STATIC_LIB_DEP_DIR/`basename $SNAPPY_LIBS` || ln -s $SNAPPY_LIBS $STATIC_LIB_DEP_DIR
-test -h $STATIC_LIB_DEP_DIR/`basename $LZ4_LIBS` || ln -s $LZ4_LIBS $STATIC_LIB_DEP_DIR
-
-EXTRA_LDFLAGS+=" -L $STATIC_LIB_DEP_DIR"
-
-set -x
-
-EXTRA_CMD=""
-if ! test -e version.json; then
-  # this is Mongo 3.0
-  EXTRA_CMD="--rocksdb \
-    --variant-dir=linux2/norm
-    --cxx=${CXX} \
-    --cc=${CC} \
-    --use-system-zlib"  # add this line back to normal code path
-                        # when https://jira.mongodb.org/browse/SERVER-19123 is resolved
-fi
-
-scons \
-  LINKFLAGS="$EXTRA_LDFLAGS $EXEC_LDFLAGS $PLATFORM_LDFLAGS" \
-  CCFLAGS="$CXXFLAGS -L $STATIC_LIB_DEP_DIR" \
-  LIBS="lz4 gcc stdc++" \
-  LIBPATH="$ROCKSDB_PATH" \
-  CPPPATH="$ROCKSDB_PATH/include" \
-  -j32 \
-  --allocator=$ALLOC \
-  --nostrip \
-  --opt=on \
-  --disable-minimum-compiler-version-enforcement \
-  --use-system-snappy \
-  --disable-warnings-as-errors \
-  $EXTRA_CMD $*
@@ -82,7 +82,7 @@ fi
 CFLAGS+=" -DTBB"

 # use Intel SSE support for checksum calculations
-export USE_SSE=1
+export USE_SSE=" -msse -msse4.2 "

 BINUTILS="$BINUTILS_BASE/bin"
 AR="$BINUTILS/ar"
@@ -1,106 +0,0 @@
-#!/bin/sh
-#
-# Set environment variables so that we can compile rocksdb using
-# fbcode settings.  It uses the latest g++ compiler and also
-# uses jemalloc
-
-# location of libgcc
-LIBGCC_BASE="/mnt/gvfs/third-party2/libgcc/7712e757d7355cb51292454ee0b7b46a467fdfed/4.8.1/gcc-4.8.1-glibc-2.17/8aac7fc"
-LIBGCC_INCLUDE="$LIBGCC_BASE/include"
-LIBGCC_LIBS=" -L $LIBGCC_BASE/libs"
-
-# location of glibc
-GLIBC_REV=6e40560b4e0b6d690fd1cf8c7a43ad7452b04cfa
-GLIBC_INCLUDE="/mnt/gvfs/third-party2/glibc/$GLIBC_REV/2.17/gcc-4.8.1-glibc-2.17/99df8fc/include"
-GLIBC_LIBS=" -L /mnt/gvfs/third-party2/glibc/$GLIBC_REV/2.17/gcc-4.8.1-glibc-2.17/99df8fc/lib"
-
-# location of snappy headers and libraries
-SNAPPY_INCLUDE=" -I /mnt/gvfs/third-party2/snappy/aef17f6c0b44b4fe408bd06f67c93701ab0a6ceb/1.0.3/gcc-4.8.1-glibc-2.17/43d84e2/include"
-SNAPPY_LIBS=" /mnt/gvfs/third-party2/snappy/aef17f6c0b44b4fe408bd06f67c93701ab0a6ceb/1.0.3/gcc-4.8.1-glibc-2.17/43d84e2/lib/libsnappy.a"
-
-# location of zlib headers and libraries
-ZLIB_INCLUDE=" -I /mnt/gvfs/third-party2/zlib/25c6216928b4d77b59ddeca0990ff6fe9ac16b81/1.2.5/gcc-4.8.1-glibc-2.17/c3f970a/include"
-ZLIB_LIBS=" /mnt/gvfs/third-party2/zlib/25c6216928b4d77b59ddeca0990ff6fe9ac16b81/1.2.5/gcc-4.8.1-glibc-2.17/c3f970a/lib/libz.a"
-
-# location of bzip headers and libraries
-BZIP_INCLUDE=" -I /mnt/gvfs/third-party2/bzip2/c9ef7629c2aa0024f7a416e87602f06eb88f5eac/1.0.6/gcc-4.8.1-glibc-2.17/c3f970a/include/"
-BZIP_LIBS=" /mnt/gvfs/third-party2/bzip2/c9ef7629c2aa0024f7a416e87602f06eb88f5eac/1.0.6/gcc-4.8.1-glibc-2.17/c3f970a/lib/libbz2.a"
-
-LZ4_REV=065ec7e38fe83329031f6668c43bef83eff5808b
-LZ4_INCLUDE=" -I /mnt/gvfs/third-party2/lz4/$LZ4_REV/r108/gcc-4.8.1-glibc-2.17/c3f970a/include"
-LZ4_LIBS=" /mnt/gvfs/third-party2/lz4/$LZ4_REV/r108/gcc-4.8.1-glibc-2.17/c3f970a/lib/liblz4.a"
-
-# location of gflags headers and libraries
-GFLAGS_INCLUDE=" -I /mnt/gvfs/third-party2/gflags/1ad047a6e6f6673991918ecadc670868205a243a/1.6/gcc-4.8.1-glibc-2.17/c3f970a/include/"
-GFLAGS_LIBS=" /mnt/gvfs/third-party2/gflags/1ad047a6e6f6673991918ecadc670868205a243a/1.6/gcc-4.8.1-glibc-2.17/c3f970a/lib/libgflags.a"
-
-# location of jemalloc
-JEMALLOC_INCLUDE=" -I /mnt/gvfs/third-party2/jemalloc/3691c776ac26dd8781e84f8888b6a0fbdbc0a9ed/dev/gcc-4.8.1-glibc-2.17/4d53c6f/include"
-JEMALLOC_LIB="/mnt/gvfs/third-party2/jemalloc/3691c776ac26dd8781e84f8888b6a0fbdbc0a9ed/dev/gcc-4.8.1-glibc-2.17/4d53c6f/lib/libjemalloc.a"
-
-# location of numa
-NUMA_REV=829d10dac0230f99cd7e1778869d2adf3da24b65
-NUMA_INCLUDE=" -I /mnt/gvfs/third-party2/numa/$NUMA_REV/2.0.8/gcc-4.8.1-glibc-2.17/c3f970a/include/"
-NUMA_LIB=" /mnt/gvfs/third-party2/numa/$NUMA_REV/2.0.8/gcc-4.8.1-glibc-2.17/c3f970a/lib/libnuma.a"
-
-# location of libunwind
-LIBUNWIND_REV=2c060e64064559905d46fd194000d61592087bdc
-LIBUNWIND="/mnt/gvfs/third-party2/libunwind/$LIBUNWIND_REV/1.1/gcc-4.8.1-glibc-2.17/675d945/lib/libunwind.a"
-
-# use Intel SSE support for checksum calculations
-export USE_SSE=1
-
-BINUTILS="/mnt/gvfs/third-party2/binutils/2aff2e7b474cd3e6ab23495ad1224b7d214b9f8e/2.21.1/centos6-native/da39a3e/bin"
-AR="$BINUTILS/ar"
-
-DEPS_INCLUDE="$SNAPPY_INCLUDE $ZLIB_INCLUDE $BZIP_INCLUDE $LZ4_INCLUDE $GFLAGS_INCLUDE $NUMA_INCLUDE"
-
-GCC_BASE="/mnt/gvfs/third-party2/gcc/1ec615e23800f0815d474478ba476a0adc3fe788/4.8.1/centos6-native/cc6c9dc"
-STDLIBS="-L $GCC_BASE/lib64"
-
-if [ -z "$USE_CLANG" ]; then
-  # gcc
-  CC="$GCC_BASE/bin/gcc"
-  CXX="$GCC_BASE/bin/g++"
-  
-  CFLAGS="-B$BINUTILS/gold -m64 -mtune=generic"
-  CFLAGS+=" -isystem $GLIBC_INCLUDE"
-  CFLAGS+=" -isystem $LIBGCC_INCLUDE"
-else
-  # clang 
-  CLANG_BASE="/mnt/gvfs/third-party2/clang/9ab68376f938992c4eb5946ca68f90c3185cffc8/3.4"
-  CLANG_INCLUDE="$CLANG_BASE/gcc-4.8.1-glibc-2.17/fb0f730/lib/clang/3.4/include"
-  CC="$CLANG_BASE/centos6-native/9cefd8a/bin/clang"
-  CXX="$CLANG_BASE/centos6-native/9cefd8a/bin/clang++"
-
-  KERNEL_HEADERS_INCLUDE="/mnt/gvfs/third-party2/kernel-headers/a683ed7135276731065a9d76d3016c9731f4e2f9/3.2.18_70_fbk11_00129_gc8882d0/gcc-4.8.1-glibc-2.17/da39a3e/include/"
-
-  CFLAGS="-B$BINUTILS/gold -nostdinc -nostdlib"
-  CFLAGS+=" -isystem $LIBGCC_BASE/include/c++/4.8.1 "
-  CFLAGS+=" -isystem $LIBGCC_BASE/include/c++/4.8.1/x86_64-facebook-linux "
-  CFLAGS+=" -isystem $GLIBC_INCLUDE"
-  CFLAGS+=" -isystem $LIBGCC_INCLUDE"
-  CFLAGS+=" -isystem $CLANG_INCLUDE"
-  CFLAGS+=" -isystem $KERNEL_HEADERS_INCLUDE/linux "
-  CFLAGS+=" -isystem $KERNEL_HEADERS_INCLUDE "
-  CXXFLAGS="-nostdinc++"
-fi
-
-CFLAGS+=" $DEPS_INCLUDE"
-CFLAGS+=" -DROCKSDB_PLATFORM_POSIX -DROCKSDB_FALLOCATE_PRESENT -DROCKSDB_MALLOC_USABLE_SIZE"
-CFLAGS+=" -DSNAPPY -DGFLAGS=google -DZLIB -DBZIP2 -DLZ4 -DNUMA"
-CXXFLAGS+=" $CFLAGS"
-
-EXEC_LDFLAGS=" $SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $GFLAGS_LIBS $NUMA_LIB"
-EXEC_LDFLAGS+=" -Wl,--dynamic-linker,/usr/local/fbcode/gcc-4.8.1-glibc-2.17/lib/ld.so"
-EXEC_LDFLAGS+=" $LIBUNWIND"
-EXEC_LDFLAGS+=" -Wl,-rpath=/usr/local/fbcode/gcc-4.8.1-glibc-2.17/lib"
-
-PLATFORM_LDFLAGS="$LIBGCC_LIBS $GLIBC_LIBS $STDLIBS -lgcc -lstdc++"
-
-EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $GFLAGS_LIBS"
-
-VALGRIND_REV=b2a9f85e4b70cd03abc85a7f3027fbc4cef35bd0
-VALGRIND_VER="/mnt/gvfs/third-party2/valgrind/$VALGRIND_REV/3.8.1/gcc-4.8.1-glibc-2.17/c3f970a/bin/"
-
-export CC CXX AR CFLAGS CXXFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED VALGRIND_VER JEMALLOC_LIB JEMALLOC_INCLUDE
@@ -0,0 +1,25 @@
+#!/bin/sh
+# Install gflags for mac developers.
+
+set -e
+
+DIR=`mktemp -d /tmp/rocksdb_gflags_XXXX`
+
+cd $DIR
+wget https://gflags.googlecode.com/files/gflags-2.0.tar.gz
+tar xvfz gflags-2.0.tar.gz
+cd gflags-2.0
+
+./configure
+make
+make install
+
+# Add include/lib path for g++
+echo 'export LIBRARY_PATH+=":/usr/local/lib"' >> ~/.bash_profile
+echo 'export CPATH+=":/usr/local/include"' >> ~/.bash_profile
+
+echo ""
+echo "-----------------------------------------------------------------------------"
+echo "|                         Installation Completed                            |"
+echo "-----------------------------------------------------------------------------"
+echo "Please run \`. ~/.bash_profile\` to be able to compile with gflags"
@@ -37,7 +37,7 @@ fi

 title "Adding new tag for this release ..."
 BRANCH="$ROCKSDB_VERSION.fb"
-$GIT checkout -b $BRANCH
+$GIT co -b $BRANCH

 # Setting up the proxy for remote repo access
 title "Pushing new branch to remote repo ..."
@@ -0,0 +1,78 @@
+#!/bin/sh
+#
+# Create the unity file
+#
+
+OUTPUT=$1
+if test -z "$OUTPUT"; then
+  echo "usage: $0 <output-filename>" >&2
+  exit 1
+fi
+
+# Delete existing file, if it exists
+rm -f "$OUTPUT"
+touch "$OUTPUT"
+
+# Detect OS
+if test -z "$TARGET_OS"; then
+    TARGET_OS=`uname -s`
+fi
+
+# generic port files (working on all platform by #ifdef) go directly in /port
+GENERIC_PORT_FILES=`cd "$ROCKSDB_ROOT"; find port -name '*.cc' | tr "\n" " "`
+
+# On GCC, we pick libc's memcmp over GCC's memcmp via -fno-builtin-memcmp
+case "$TARGET_OS" in
+    Darwin)
+        # PORT_FILES=port/darwin/darwin_specific.cc
+        ;;
+    IOS)
+        ;;
+    Linux)
+        # PORT_FILES=port/linux/linux_specific.cc
+        ;;
+    SunOS)
+        # PORT_FILES=port/sunos/sunos_specific.cc
+        ;;
+    FreeBSD)
+        # PORT_FILES=port/freebsd/freebsd_specific.cc
+        ;;
+    NetBSD)
+        # PORT_FILES=port/netbsd/netbsd_specific.cc
+        ;;
+    OpenBSD)
+        # PORT_FILES=port/openbsd/openbsd_specific.cc
+        ;;
+    DragonFly)
+        # PORT_FILES=port/dragonfly/dragonfly_specific.cc
+        ;;
+    OS_ANDROID_CROSSCOMPILE)
+        # PORT_FILES=port/android/android.cc
+        ;;
+    *)
+        echo "Unknown platform!" >&2
+        exit 1
+esac
+
+# We want to make a list of all cc files within util, db, table, and helpers
+# except for the test and benchmark files. By default, find will output a list
+# of all files matching either rule, so we need to append -print to make the
+# prune take effect.
+DIRS="util db table utilities"
+
+set -f # temporarily disable globbing so that our patterns arent expanded
+PRUNE_TEST="-name *test*.cc -prune"
+PRUNE_BENCH="-name *bench*.cc -prune"
+PORTABLE_FILES=`cd "$ROCKSDB_ROOT"; find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o -name '*.cc' -print | sort`
+PORTABLE_CPP=`cd "$ROCKSDB_ROOT"; find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o -name '*.cpp' -print | sort`
+set +f # re-enable globbing
+
+# The sources consist of the portable files, plus the platform-specific port
+# file.
+for SOURCE_FILE in $PORTABLE_FILES $GENERIC_PORT_FILES $PORT_FILES $PORTABLE_CPP
+do
+	echo "#include <$SOURCE_FILE>" >> "$OUTPUT"
+done
+
+echo "int main(int argc, char** argv){ return 0; }" >> "$OUTPUT"
+
@@ -9,7 +9,6 @@

 #include "db/builder.h"

-#include <vector>
 #include "db/dbformat.h"
 #include "db/filename.h"
 #include "db/merge_helper.h"
@@ -21,42 +20,31 @@
 #include "rocksdb/options.h"
 #include "rocksdb/table.h"
 #include "table/block_based_table_builder.h"
-#include "util/file_reader_writer.h"
-#include "util/iostats_context_imp.h"
-#include "util/thread_status_util.h"
 #include "util/stop_watch.h"

 namespace rocksdb {

 class TableFactory;

-TableBuilder* NewTableBuilder(
-    const ImmutableCFOptions& ioptions,
-    const InternalKeyComparator& internal_comparator,
-    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
-        int_tbl_prop_collector_factories,
-    WritableFileWriter* file, const CompressionType compression_type,
-    const CompressionOptions& compression_opts, const bool skip_filters) {
+TableBuilder* NewTableBuilder(const ImmutableCFOptions& ioptions,
+                              const InternalKeyComparator& internal_comparator,
+                              WritableFile* file,
+                              const CompressionType compression_type,
+                              const CompressionOptions& compression_opts) {
  return ioptions.table_factory->NewTableBuilder(
-      TableBuilderOptions(ioptions, internal_comparator,
-                          int_tbl_prop_collector_factories, compression_type,
-                          compression_opts, skip_filters),
-      file);
+      ioptions, internal_comparator, file, compression_type, compression_opts);
 }

-Status BuildTable(
-    const std::string& dbname, Env* env, const ImmutableCFOptions& ioptions,
-    const EnvOptions& env_options, TableCache* table_cache, Iterator* iter,
-    FileMetaData* meta, const InternalKeyComparator& internal_comparator,
-    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
-        int_tbl_prop_collector_factories,
-    const SequenceNumber newest_snapshot,
-    const SequenceNumber earliest_seqno_in_memtable,
-    const CompressionType compression,
-    const CompressionOptions& compression_opts, bool paranoid_file_checks,
-    const Env::IOPriority io_priority, TableProperties* table_properties) {
-  // Reports the IOStats for flush for every following bytes.
-  const size_t kReportFlushIOStatsEvery = 1048576;
+Status BuildTable(const std::string& dbname, Env* env,
+                  const ImmutableCFOptions& ioptions,
+                  const EnvOptions& env_options, TableCache* table_cache,
+                  Iterator* iter, FileMetaData* meta,
+                  const InternalKeyComparator& internal_comparator,
+                  const SequenceNumber newest_snapshot,
+                  const SequenceNumber earliest_seqno_in_memtable,
+                  const CompressionType compression,
+                  const CompressionOptions& compression_opts,
+                  const Env::IOPriority io_priority) {
  Status s;
  meta->fd.file_size = 0;
  meta->smallest_seqno = meta->largest_seqno = 0;
@@ -65,7 +53,7 @@ Status BuildTable(
  // If the sequence number of the smallest entry in the memtable is
  // smaller than the most recent snapshot, then we do not trigger
  // removal of duplicate/deleted keys as part of this builder.
-  bool purge = true;
+  bool purge = ioptions.purge_redundant_kvs_while_flush;
  if (earliest_seqno_in_memtable <= newest_snapshot) {
    purge = false;
  }
@@ -73,22 +61,16 @@ Status BuildTable(
  std::string fname = TableFileName(ioptions.db_paths, meta->fd.GetNumber(),
                                    meta->fd.GetPathId());
  if (iter->Valid()) {
-    TableBuilder* builder;
-    unique_ptr<WritableFileWriter> file_writer;
-    {
-      unique_ptr<WritableFile> file;
-      s = env->NewWritableFile(fname, &file, env_options);
-      if (!s.ok()) {
-        return s;
-      }
-      file->SetIOPriority(io_priority);
-
-      file_writer.reset(new WritableFileWriter(std::move(file), env_options));
-
-      builder = NewTableBuilder(
-          ioptions, internal_comparator, int_tbl_prop_collector_factories,
-          file_writer.get(), compression, compression_opts);
+    unique_ptr<WritableFile> file;
+    s = env->NewWritableFile(fname, &file, env_options);
+    if (!s.ok()) {
+      return s;
    }
+    file->SetIOPriority(io_priority);
+
+    TableBuilder* builder = NewTableBuilder(
+        ioptions, internal_comparator, file.get(),
+        compression, compression_opts);

    {
      // the first key is the smallest key
@@ -187,13 +169,6 @@ Status BuildTable(
          }
        }

-        if (io_priority == Env::IO_HIGH &&
-            IOSTATS(bytes_written) >= kReportFlushIOStatsEvery) {
-          ThreadStatusUtil::IncreaseThreadOperationProperty(
-              ThreadStatus::FLUSH_BYTES_WRITTEN,
-              IOSTATS(bytes_written));
-          IOSTATS_RESET(bytes_written);
-        }
        if (!iterator_at_next) iter->Next();
      }

@@ -211,39 +186,33 @@ Status BuildTable(
        SequenceNumber seqno = GetInternalKeySeqno(key);
        meta->smallest_seqno = std::min(meta->smallest_seqno, seqno);
        meta->largest_seqno = std::max(meta->largest_seqno, seqno);
-        if (io_priority == Env::IO_HIGH &&
-            IOSTATS(bytes_written) >= kReportFlushIOStatsEvery) {
-          ThreadStatusUtil::IncreaseThreadOperationProperty(
-              ThreadStatus::FLUSH_BYTES_WRITTEN,
-              IOSTATS(bytes_written));
-          IOSTATS_RESET(bytes_written);
-        }
      }
    }

    // Finish and check for builder errors
    if (s.ok()) {
      s = builder->Finish();
+      if (s.ok()) {
+        meta->fd.file_size = builder->FileSize();
+        assert(meta->fd.GetFileSize() > 0);
+      }
    } else {
      builder->Abandon();
    }
-    if (s.ok()) {
-      meta->fd.file_size = builder->FileSize();
-      meta->marked_for_compaction = builder->NeedCompact();
-      assert(meta->fd.GetFileSize() > 0);
-      if (table_properties) {
-        *table_properties = builder->GetTableProperties();
-      }
-    }
    delete builder;

    // Finish and check for file errors
    if (s.ok() && !ioptions.disable_data_sync) {
-      StopWatch sw(env, ioptions.statistics, TABLE_SYNC_MICROS);
-      file_writer->Sync(ioptions.use_fsync);
+      if (ioptions.use_fsync) {
+        StopWatch sw(env, ioptions.statistics, TABLE_SYNC_MICROS);
+        s = file->Fsync();
+      } else {
+        StopWatch sw(env, ioptions.statistics, TABLE_SYNC_MICROS);
+        s = file->Sync();
+      }
    }
    if (s.ok()) {
-      s = file_writer->Close();
+      s = file->Close();
    }

    if (s.ok()) {
@@ -251,11 +220,6 @@ Status BuildTable(
      Iterator* it = table_cache->NewIterator(ReadOptions(), env_options,
                                              internal_comparator, meta->fd);
      s = it->status();
-      if (s.ok() && paranoid_file_checks) {
-        for (it->SeekToFirst(); it->Valid(); it->Next()) {}
-        s = it->status();
-      }
-
      delete it;
    }
  }
@@ -6,17 +6,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 #pragma once
-#include <string>
-#include <utility>
-#include <vector>
-#include "db/table_properties_collector.h"
 #include "rocksdb/comparator.h"
 #include "rocksdb/env.h"
 #include "rocksdb/status.h"
 #include "rocksdb/types.h"
 #include "rocksdb/options.h"
 #include "rocksdb/immutable_options.h"
-#include "rocksdb/table_properties.h"

 namespace rocksdb {

@@ -29,33 +24,29 @@ class Iterator;
 class TableCache;
 class VersionEdit;
 class TableBuilder;
-class WritableFileWriter;
+class WritableFile;

-TableBuilder* NewTableBuilder(
+extern TableBuilder* NewTableBuilder(
    const ImmutableCFOptions& options,
    const InternalKeyComparator& internal_comparator,
-    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
-        int_tbl_prop_collector_factories,
-    WritableFileWriter* file, const CompressionType compression_type,
-    const CompressionOptions& compression_opts,
-    const bool skip_filters = false);
+    WritableFile* file, const CompressionType compression_type,
+    const CompressionOptions& compression_opts);

 // Build a Table file from the contents of *iter.  The generated file
 // will be named according to number specified in meta. On success, the rest of
 // *meta will be filled with metadata about the generated table.
 // If no data is present in *iter, meta->file_size will be set to
 // zero, and no Table file will be produced.
-extern Status BuildTable(
-    const std::string& dbname, Env* env, const ImmutableCFOptions& options,
-    const EnvOptions& env_options, TableCache* table_cache, Iterator* iter,
-    FileMetaData* meta, const InternalKeyComparator& internal_comparator,
-    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
-        int_tbl_prop_collector_factories,
-    const SequenceNumber newest_snapshot,
-    const SequenceNumber earliest_seqno_in_memtable,
-    const CompressionType compression,
-    const CompressionOptions& compression_opts, bool paranoid_file_checks,
-    const Env::IOPriority io_priority = Env::IO_HIGH,
-    TableProperties* table_properties = nullptr);
+extern Status BuildTable(const std::string& dbname, Env* env,
+                         const ImmutableCFOptions& options,
+                         const EnvOptions& env_options,
+                         TableCache* table_cache, Iterator* iter,
+                         FileMetaData* meta,
+                         const InternalKeyComparator& internal_comparator,
+                         const SequenceNumber newest_snapshot,
+                         const SequenceNumber earliest_seqno_in_memtable,
+                         const CompressionType compression,
+                         const CompressionOptions& compression_opts,
+                         const Env::IOPriority io_priority = Env::IO_HIGH);

 }  // namespace rocksdb
@@ -12,11 +12,10 @@
 #include "rocksdb/c.h"

 #include <stdlib.h>
-#include "port/port.h"
+#include <unistd.h>
 #include "rocksdb/cache.h"
 #include "rocksdb/compaction_filter.h"
 #include "rocksdb/comparator.h"
-#include "rocksdb/convenience.h"
 #include "rocksdb/db.h"
 #include "rocksdb/env.h"
 #include "rocksdb/filter_policy.h"
@@ -30,8 +29,6 @@
 #include "rocksdb/statistics.h"
 #include "rocksdb/slice_transform.h"
 #include "rocksdb/table.h"
-#include "rocksdb/utilities/backupable_db.h"
-#include "utilities/merge_operators.h"

 using rocksdb::Cache;
 using rocksdb::ColumnFamilyDescriptor;
@@ -39,6 +36,8 @@ using rocksdb::ColumnFamilyHandle;
 using rocksdb::ColumnFamilyOptions;
 using rocksdb::CompactionFilter;
 using rocksdb::CompactionFilterFactory;
+using rocksdb::CompactionFilterV2;
+using rocksdb::CompactionFilterFactoryV2;
 using rocksdb::CompactionFilterContext;
 using rocksdb::CompactionOptionsFIFO;
 using rocksdb::Comparator;
@@ -53,18 +52,15 @@ using rocksdb::FlushOptions;
 using rocksdb::Iterator;
 using rocksdb::Logger;
 using rocksdb::MergeOperator;
-using rocksdb::MergeOperators;
 using rocksdb::NewBloomFilterPolicy;
 using rocksdb::NewLRUCache;
 using rocksdb::Options;
 using rocksdb::BlockBasedTableOptions;
-using rocksdb::CuckooTableOptions;
 using rocksdb::RandomAccessFile;
 using rocksdb::Range;
 using rocksdb::ReadOptions;
 using rocksdb::SequentialFile;
 using rocksdb::Slice;
-using rocksdb::SliceParts;
 using rocksdb::SliceTransform;
 using rocksdb::Snapshot;
 using rocksdb::Status;
@@ -72,33 +68,21 @@ using rocksdb::WritableFile;
 using rocksdb::WriteBatch;
 using rocksdb::WriteOptions;
 using rocksdb::LiveFileMetaData;
-using rocksdb::BackupEngine;
-using rocksdb::BackupableDBOptions;
-using rocksdb::BackupInfo;
-using rocksdb::RestoreOptions;
-using rocksdb::CompactRangeOptions;

 using std::shared_ptr;

 extern "C" {

 struct rocksdb_t                 { DB*               rep; };
-struct rocksdb_backup_engine_t   { BackupEngine*     rep; };
-struct rocksdb_backup_engine_info_t { std::vector<BackupInfo> rep; };
-struct rocksdb_restore_options_t { RestoreOptions rep; };
 struct rocksdb_iterator_t        { Iterator*         rep; };
 struct rocksdb_writebatch_t      { WriteBatch        rep; };
 struct rocksdb_snapshot_t        { const Snapshot*   rep; };
 struct rocksdb_flushoptions_t    { FlushOptions      rep; };
 struct rocksdb_fifo_compaction_options_t { CompactionOptionsFIFO rep; };
-struct rocksdb_readoptions_t {
-   ReadOptions rep;
-   Slice upper_bound; // stack variable to set pointer to in ReadOptions
-};
+struct rocksdb_readoptions_t     { ReadOptions       rep; };
 struct rocksdb_writeoptions_t    { WriteOptions      rep; };
 struct rocksdb_options_t         { Options           rep; };
 struct rocksdb_block_based_table_options_t  { BlockBasedTableOptions rep; };
-struct rocksdb_cuckoo_table_options_t  { CuckooTableOptions rep; };
 struct rocksdb_seqfile_t         { SequentialFile*   rep; };
 struct rocksdb_randomfile_t      { RandomAccessFile* rep; };
 struct rocksdb_writablefile_t    { WritableFile*     rep; };
@@ -128,9 +112,12 @@ struct rocksdb_compactionfilter_t : public CompactionFilter {
    (*destructor_)(state_);
  }

-  virtual bool Filter(int level, const Slice& key, const Slice& existing_value,
-                      std::string* new_value,
-                      bool* value_changed) const override {
+  virtual bool Filter(
+      int level,
+      const Slice& key,
+      const Slice& existing_value,
+      std::string* new_value,
+      bool* value_changed) const {
    char* c_new_value = nullptr;
    size_t new_value_length = 0;
    unsigned char c_value_changed = 0;
@@ -147,7 +134,9 @@ struct rocksdb_compactionfilter_t : public CompactionFilter {
    return result;
  }

-  virtual const char* Name() const override { return (*name_)(state_); }
+  virtual const char* Name() const {
+    return (*name_)(state_);
+  }
 };

 struct rocksdb_compactionfilterfactory_t : public CompactionFilterFactory {
@@ -160,14 +149,112 @@ struct rocksdb_compactionfilterfactory_t : public CompactionFilterFactory {
  virtual ~rocksdb_compactionfilterfactory_t() { (*destructor_)(state_); }

  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& context) override {
+      const CompactionFilter::Context& context) {
    rocksdb_compactionfiltercontext_t ccontext;
    ccontext.rep = context;
    CompactionFilter* cf = (*create_compaction_filter_)(state_, &ccontext);
    return std::unique_ptr<CompactionFilter>(cf);
  }

-  virtual const char* Name() const override { return (*name_)(state_); }
+  virtual const char* Name() const { return (*name_)(state_); }
+};
+
+struct rocksdb_compactionfilterv2_t : public CompactionFilterV2 {
+  void* state_;
+  void (*destructor_)(void*);
+  const char* (*name_)(void*);
+  void (*filter_)(void*, int level, size_t num_keys,
+                  const char* const* keys_list, const size_t* keys_list_sizes,
+                  const char* const* existing_values_list, const size_t* existing_values_list_sizes,
+                  char** new_values_list, size_t* new_values_list_sizes,
+                  unsigned char* to_delete_list);
+
+  virtual ~rocksdb_compactionfilterv2_t() {
+    (*destructor_)(state_);
+  }
+
+  virtual const char* Name() const {
+    return (*name_)(state_);
+  }
+
+  virtual std::vector<bool> Filter(int level,
+                                   const SliceVector& keys,
+                                   const SliceVector& existing_values,
+                                   std::vector<std::string>* new_values,
+                                   std::vector<bool>* values_changed) const {
+    // Make a vector pointing to the underlying key data.
+    size_t num_keys = keys.size();
+    std::vector<const char*> keys_list(num_keys);
+    std::vector<size_t> keys_list_sizes(num_keys);
+    for (size_t i = 0; i < num_keys; ++i) {
+      keys_list[i] = keys[i].data();
+      keys_list_sizes[i] = keys[i].size();
+    }
+    // Make a vector pointing to the underlying value data.
+    std::vector<const char*> existing_values_list(num_keys);
+    std::vector<size_t> existing_values_list_sizes(num_keys);
+    for (size_t i = 0; i < num_keys; ++i) {
+      existing_values_list[i] = existing_values[i].data();
+      existing_values_list_sizes[i] = existing_values[i].size();
+    }
+    // Make a vector which will accept newly-allocated char* arrays
+    // which we will take ownership of and assign to strings in new_values.
+    new_values->clear();
+    std::vector<char*> new_values_list(num_keys);
+    std::vector<size_t> new_values_list_sizes(num_keys);
+    // Resize values_changed to hold all keys.
+    values_changed->resize(num_keys);
+    // Make a vector for bools indicating a value should be deleted
+    // on compaction (true) or maintained (false).
+    std::vector<unsigned char> to_delete_list(num_keys);
+
+    (*filter_)(
+        state_, level, num_keys, &keys_list[0], &keys_list_sizes[0],
+        &existing_values_list[0], &existing_values_list_sizes[0],
+        &new_values_list[0], &new_values_list_sizes[0], &to_delete_list[0]);
+
+    // Now, we transfer any changed values, setting values_changed and
+    // initializing new_values in the event a value changed.
+    std::vector<bool> to_delete(num_keys);
+    for (size_t i = 0; i < num_keys; ++i) {
+      to_delete[i] = to_delete_list[i];
+      (*values_changed)[i] = new_values_list[i] != nullptr;
+      if ((*values_changed)[i]) {
+        new_values->push_back(std::string(new_values_list[i], new_values_list_sizes[i]));
+        free(new_values_list[i]);
+      }
+    }
+    return to_delete;
+  }
+};
+
+struct rocksdb_compactionfilterfactoryv2_t : public CompactionFilterFactoryV2 {
+  void* state_;
+  void (*destructor_)(void*);
+  const char* (*name_)(void*);
+  rocksdb_compactionfilterv2_t* (*create_compaction_filter_v2_)(
+      void* state, const rocksdb_compactionfiltercontext_t* context);
+
+  rocksdb_compactionfilterfactoryv2_t(const SliceTransform* prefix_extractor)
+      : CompactionFilterFactoryV2(prefix_extractor) {
+  }
+
+  virtual ~rocksdb_compactionfilterfactoryv2_t() {
+    (*destructor_)(state_);
+  }
+
+  virtual const char* Name() const {
+    return (*name_)(state_);
+  }
+
+  virtual std::unique_ptr<CompactionFilterV2> CreateCompactionFilterV2(
+      const CompactionFilterContext& context) {
+    struct rocksdb_compactionfiltercontext_t c_context;
+    c_context.rep.is_full_compaction = context.is_full_compaction;
+    c_context.rep.is_manual_compaction = context.is_manual_compaction;
+    return std::unique_ptr<CompactionFilterV2>(
+        (*create_compaction_filter_v2_)(state_, &c_context));
+  }
 };

 struct rocksdb_comparator_t : public Comparator {
@@ -183,16 +270,17 @@ struct rocksdb_comparator_t : public Comparator {
    (*destructor_)(state_);
  }

-  virtual int Compare(const Slice& a, const Slice& b) const override {
+  virtual int Compare(const Slice& a, const Slice& b) const {
    return (*compare_)(state_, a.data(), a.size(), b.data(), b.size());
  }

-  virtual const char* Name() const override { return (*name_)(state_); }
+  virtual const char* Name() const {
+    return (*name_)(state_);
+  }

  // No-ops since the C binding does not support key shortening methods.
-  virtual void FindShortestSeparator(std::string*,
-                                     const Slice&) const override {}
-  virtual void FindShortSuccessor(std::string* key) const override {}
+  virtual void FindShortestSeparator(std::string*, const Slice&) const { }
+  virtual void FindShortSuccessor(std::string* key) const { }
 };

 struct rocksdb_filterpolicy_t : public FilterPolicy {
@@ -216,10 +304,11 @@ struct rocksdb_filterpolicy_t : public FilterPolicy {
    (*destructor_)(state_);
  }

-  virtual const char* Name() const override { return (*name_)(state_); }
+  virtual const char* Name() const {
+    return (*name_)(state_);
+  }

-  virtual void CreateFilter(const Slice* keys, int n,
-                            std::string* dst) const override {
+  virtual void CreateFilter(const Slice* keys, int n, std::string* dst) const {
    std::vector<const char*> key_pointers(n);
    std::vector<size_t> key_sizes(n);
    for (int i = 0; i < n; i++) {
@@ -237,8 +326,7 @@ struct rocksdb_filterpolicy_t : public FilterPolicy {
    }
  }

-  virtual bool KeyMayMatch(const Slice& key,
-                           const Slice& filter) const override {
+  virtual bool KeyMayMatch(const Slice& key, const Slice& filter) const {
    return (*key_match_)(state_, key.data(), key.size(),
                         filter.data(), filter.size());
  }
@@ -267,12 +355,17 @@ struct rocksdb_mergeoperator_t : public MergeOperator {
    (*destructor_)(state_);
  }

-  virtual const char* Name() const override { return (*name_)(state_); }
+  virtual const char* Name() const {
+    return (*name_)(state_);
+  }
+
+  virtual bool FullMerge(
+      const Slice& key,
+      const Slice* existing_value,
+      const std::deque<std::string>& operand_list,
+      std::string* new_value,
+      Logger* logger) const {

-  virtual bool FullMerge(const Slice& key, const Slice* existing_value,
-                         const std::deque<std::string>& operand_list,
-                         std::string* new_value,
-                         Logger* logger) const override {
    size_t n = operand_list.size();
    std::vector<const char*> operand_pointers(n);
    std::vector<size_t> operand_sizes(n);
@@ -292,9 +385,11 @@ struct rocksdb_mergeoperator_t : public MergeOperator {
    unsigned char success;
    size_t new_value_len;
    char* tmp_new_value = (*full_merge_)(
-        state_, key.data(), key.size(), existing_value_data, existing_value_len,
-        &operand_pointers[0], &operand_sizes[0], static_cast<int>(n), &success,
-        &new_value_len);
+        state_,
+        key.data(), key.size(),
+        existing_value_data, existing_value_len,
+        &operand_pointers[0], &operand_sizes[0], n,
+        &success, &new_value_len);
    new_value->assign(tmp_new_value, new_value_len);

    if (delete_value_ != nullptr) {
@@ -308,8 +403,7 @@ struct rocksdb_mergeoperator_t : public MergeOperator {

  virtual bool PartialMergeMulti(const Slice& key,
                                 const std::deque<Slice>& operand_list,
-                                 std::string* new_value,
-                                 Logger* logger) const override {
+                                 std::string* new_value, Logger* logger) const {
    size_t operand_count = operand_list.size();
    std::vector<const char*> operand_pointers(operand_count);
    std::vector<size_t> operand_sizes(operand_count);
@@ -323,7 +417,7 @@ struct rocksdb_mergeoperator_t : public MergeOperator {
    size_t new_value_len;
    char* tmp_new_value = (*partial_merge_)(
        state_, key.data(), key.size(), &operand_pointers[0], &operand_sizes[0],
-        static_cast<int>(operand_count), &success, &new_value_len);
+        operand_count, &success, &new_value_len);
    new_value->assign(tmp_new_value, new_value_len);

    if (delete_value_ != nullptr) {
@@ -360,19 +454,21 @@ struct rocksdb_slicetransform_t : public SliceTransform {
    (*destructor_)(state_);
  }

-  virtual const char* Name() const override { return (*name_)(state_); }
+  virtual const char* Name() const {
+    return (*name_)(state_);
+  }

-  virtual Slice Transform(const Slice& src) const override {
+  virtual Slice Transform(const Slice& src) const {
    size_t len;
    char* dst = (*transform_)(state_, src.data(), src.size(), &len);
    return Slice(dst, len);
  }

-  virtual bool InDomain(const Slice& src) const override {
+  virtual bool InDomain(const Slice& src) const {
    return (*in_domain_)(state_, src.data(), src.size());
  }

-  virtual bool InRange(const Slice& src) const override {
+  virtual bool InRange(const Slice& src) const {
    return (*in_range_)(state_, src.data(), src.size());
  }
 };
@@ -389,7 +485,6 @@ static bool SaveError(char** errptr, const Status& s) {
    *errptr = strdup(s.ToString().c_str());
  } else {
    // TODO(sanjay): Merge with existing error?
-    // This is a bug if *errptr is not created by malloc()
    free(*errptr);
    *errptr = strdup(s.ToString().c_str());
  }
@@ -429,94 +524,11 @@ rocksdb_t* rocksdb_open_for_read_only(
  return result;
 }

-rocksdb_backup_engine_t* rocksdb_backup_engine_open(
-    const rocksdb_options_t* options, const char* path, char** errptr) {
-  BackupEngine* be;
-  if (SaveError(errptr, BackupEngine::Open(options->rep.env,
-                                           BackupableDBOptions(path), &be))) {
-    return nullptr;
-  }
-  rocksdb_backup_engine_t* result = new rocksdb_backup_engine_t;
-  result->rep = be;
-  return result;
-}
-
-void rocksdb_backup_engine_create_new_backup(rocksdb_backup_engine_t* be,
-                                             rocksdb_t* db, char** errptr) {
-  SaveError(errptr, be->rep->CreateNewBackup(db->rep));
-}
-
-rocksdb_restore_options_t* rocksdb_restore_options_create() {
-  return new rocksdb_restore_options_t;
-}
-
-void rocksdb_restore_options_destroy(rocksdb_restore_options_t* opt) {
-  delete opt;
-}
-
-void rocksdb_restore_options_set_keep_log_files(rocksdb_restore_options_t* opt,
-                                                int v) {
-  opt->rep.keep_log_files = v;
-}
-
-void rocksdb_backup_engine_restore_db_from_latest_backup(
-    rocksdb_backup_engine_t* be, const char* db_dir, const char* wal_dir,
-    const rocksdb_restore_options_t* restore_options, char** errptr) {
-  SaveError(errptr, be->rep->RestoreDBFromLatestBackup(std::string(db_dir),
-                                                       std::string(wal_dir),
-                                                       restore_options->rep));
-}
-
-const rocksdb_backup_engine_info_t* rocksdb_backup_engine_get_backup_info(
-    rocksdb_backup_engine_t* be) {
-  rocksdb_backup_engine_info_t* result = new rocksdb_backup_engine_info_t;
-  be->rep->GetBackupInfo(&result->rep);
-  return result;
-}
-
-int rocksdb_backup_engine_info_count(const rocksdb_backup_engine_info_t* info) {
-  return static_cast<int>(info->rep.size());
-}
-
-int64_t rocksdb_backup_engine_info_timestamp(
-    const rocksdb_backup_engine_info_t* info, int index) {
-  return info->rep[index].timestamp;
-}
-
-uint32_t rocksdb_backup_engine_info_backup_id(
-    const rocksdb_backup_engine_info_t* info, int index) {
-  return info->rep[index].backup_id;
-}
-
-uint64_t rocksdb_backup_engine_info_size(
-    const rocksdb_backup_engine_info_t* info, int index) {
-  return info->rep[index].size;
-}
-
-uint32_t rocksdb_backup_engine_info_number_files(
-    const rocksdb_backup_engine_info_t* info, int index) {
-  return info->rep[index].number_files;
-}
-
-void rocksdb_backup_engine_info_destroy(
-    const rocksdb_backup_engine_info_t* info) {
-  delete info;
-}
-
-void rocksdb_backup_engine_close(rocksdb_backup_engine_t* be) {
-  delete be->rep;
-  delete be;
-}
-
 void rocksdb_close(rocksdb_t* db) {
  delete db->rep;
  delete db;
 }

-void rocksdb_options_set_uint64add_merge_operator(rocksdb_options_t* opt) {
-  opt->rep.merge_operator = rocksdb::MergeOperators::CreateUInt64AddOperator();
-}
-
 rocksdb_t* rocksdb_open_column_families(
    const rocksdb_options_t* db_options,
    const char* name,
@@ -745,69 +757,6 @@ char* rocksdb_get_cf(
  return result;
 }

-void rocksdb_multi_get(
-    rocksdb_t* db,
-    const rocksdb_readoptions_t* options,
-    size_t num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes,
-    char** values_list, size_t* values_list_sizes,
-    char** errs) {
-  std::vector<Slice> keys(num_keys);
-  for (size_t i = 0; i < num_keys; i++) {
-    keys[i] = Slice(keys_list[i], keys_list_sizes[i]);
-  }
-  std::vector<std::string> values(num_keys);
-  std::vector<Status> statuses = db->rep->MultiGet(options->rep, keys, &values);
-  for (size_t i = 0; i < num_keys; i++) {
-    if (statuses[i].ok()) {
-      values_list[i] = CopyString(values[i]);
-      values_list_sizes[i] = values[i].size();
-      errs[i] = nullptr;
-    } else {
-      values_list[i] = nullptr;
-      values_list_sizes[i] = 0;
-      if (!statuses[i].IsNotFound()) {
-        errs[i] = strdup(statuses[i].ToString().c_str());
-      } else {
-        errs[i] = nullptr;
-      }
-    }
-  }
-}
-
-void rocksdb_multi_get_cf(
-    rocksdb_t* db,
-    const rocksdb_readoptions_t* options,
-    const rocksdb_column_family_handle_t* const* column_families,
-    size_t num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes,
-    char** values_list, size_t* values_list_sizes,
-    char** errs) {
-  std::vector<Slice> keys(num_keys);
-  std::vector<ColumnFamilyHandle*> cfs(num_keys);
-  for (size_t i = 0; i < num_keys; i++) {
-    keys[i] = Slice(keys_list[i], keys_list_sizes[i]);
-    cfs[i] = column_families[i]->rep;
-  }
-  std::vector<std::string> values(num_keys);
-  std::vector<Status> statuses = db->rep->MultiGet(options->rep, cfs, keys, &values);
-  for (size_t i = 0; i < num_keys; i++) {
-    if (statuses[i].ok()) {
-      values_list[i] = CopyString(values[i]);
-      values_list_sizes[i] = values[i].size();
-      errs[i] = nullptr;
-    } else {
-      values_list[i] = nullptr;
-      values_list_sizes[i] = 0;
-      if (!statuses[i].IsNotFound()) {
-        errs[i] = strdup(statuses[i].ToString().c_str());
-      } else {
-        errs[i] = nullptr;
-      }
-    }
-  }
-}
-
 rocksdb_iterator_t* rocksdb_create_iterator(
    rocksdb_t* db,
    const rocksdb_readoptions_t* options) {
@@ -914,7 +863,6 @@ void rocksdb_compact_range(
    const char* limit_key, size_t limit_key_len) {
  Slice a, b;
  db->rep->CompactRange(
-      CompactRangeOptions(),
      // Pass nullptr Slice if corresponding "const char*" is nullptr
      (start_key ? (a = Slice(start_key, start_key_len), &a) : nullptr),
      (limit_key ? (b = Slice(limit_key, limit_key_len), &b) : nullptr));
@@ -927,7 +875,7 @@ void rocksdb_compact_range_cf(
    const char* limit_key, size_t limit_key_len) {
  Slice a, b;
  db->rep->CompactRange(
-      CompactRangeOptions(), column_family->rep,
+      column_family->rep,
      // Pass nullptr Slice if corresponding "const char*" is nullptr
      (start_key ? (a = Slice(start_key, start_key_len), &a) : nullptr),
      (limit_key ? (b = Slice(limit_key, limit_key_len), &b) : nullptr));
@@ -1050,43 +998,6 @@ void rocksdb_writebatch_put_cf(
  b->rep.Put(column_family->rep, Slice(key, klen), Slice(val, vlen));
 }

-void rocksdb_writebatch_putv(
-    rocksdb_writebatch_t* b,
-    int num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes,
-    int num_values, const char* const* values_list,
-    const size_t* values_list_sizes) {
-  std::vector<Slice> key_slices(num_keys);
-  for (int i = 0; i < num_keys; i++) {
-    key_slices[i] = Slice(keys_list[i], keys_list_sizes[i]);
-  }
-  std::vector<Slice> value_slices(num_values);
-  for (int i = 0; i < num_values; i++) {
-    value_slices[i] = Slice(values_list[i], values_list_sizes[i]);
-  }
-  b->rep.Put(SliceParts(key_slices.data(), num_keys),
-             SliceParts(value_slices.data(), num_values));
-}
-
-void rocksdb_writebatch_putv_cf(
-    rocksdb_writebatch_t* b,
-    rocksdb_column_family_handle_t* column_family,
-    int num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes,
-    int num_values, const char* const* values_list,
-    const size_t* values_list_sizes) {
-  std::vector<Slice> key_slices(num_keys);
-  for (int i = 0; i < num_keys; i++) {
-    key_slices[i] = Slice(keys_list[i], keys_list_sizes[i]);
-  }
-  std::vector<Slice> value_slices(num_values);
-  for (int i = 0; i < num_values; i++) {
-    value_slices[i] = Slice(values_list[i], values_list_sizes[i]);
-  }
-  b->rep.Put(column_family->rep, SliceParts(key_slices.data(), num_keys),
-             SliceParts(value_slices.data(), num_values));
-}
-
 void rocksdb_writebatch_merge(
    rocksdb_writebatch_t* b,
    const char* key, size_t klen,
@@ -1102,43 +1013,6 @@ void rocksdb_writebatch_merge_cf(
  b->rep.Merge(column_family->rep, Slice(key, klen), Slice(val, vlen));
 }

-void rocksdb_writebatch_mergev(
-    rocksdb_writebatch_t* b,
-    int num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes,
-    int num_values, const char* const* values_list,
-    const size_t* values_list_sizes) {
-  std::vector<Slice> key_slices(num_keys);
-  for (int i = 0; i < num_keys; i++) {
-    key_slices[i] = Slice(keys_list[i], keys_list_sizes[i]);
-  }
-  std::vector<Slice> value_slices(num_values);
-  for (int i = 0; i < num_values; i++) {
-    value_slices[i] = Slice(values_list[i], values_list_sizes[i]);
-  }
-  b->rep.Merge(SliceParts(key_slices.data(), num_keys),
-               SliceParts(value_slices.data(), num_values));
-}
-
-void rocksdb_writebatch_mergev_cf(
-    rocksdb_writebatch_t* b,
-    rocksdb_column_family_handle_t* column_family,
-    int num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes,
-    int num_values, const char* const* values_list,
-    const size_t* values_list_sizes) {
-  std::vector<Slice> key_slices(num_keys);
-  for (int i = 0; i < num_keys; i++) {
-    key_slices[i] = Slice(keys_list[i], keys_list_sizes[i]);
-  }
-  std::vector<Slice> value_slices(num_values);
-  for (int i = 0; i < num_values; i++) {
-    value_slices[i] = Slice(values_list[i], values_list_sizes[i]);
-  }
-  b->rep.Merge(column_family->rep, SliceParts(key_slices.data(), num_keys),
-               SliceParts(value_slices.data(), num_values));
-}
-
 void rocksdb_writebatch_delete(
    rocksdb_writebatch_t* b,
    const char* key, size_t klen) {
@@ -1152,35 +1026,6 @@ void rocksdb_writebatch_delete_cf(
  b->rep.Delete(column_family->rep, Slice(key, klen));
 }

-void rocksdb_writebatch_deletev(
-    rocksdb_writebatch_t* b,
-    int num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes) {
-  std::vector<Slice> key_slices(num_keys);
-  for (int i = 0; i < num_keys; i++) {
-    key_slices[i] = Slice(keys_list[i], keys_list_sizes[i]);
-  }
-  b->rep.Delete(SliceParts(key_slices.data(), num_keys));
-}
-
-void rocksdb_writebatch_deletev_cf(
-    rocksdb_writebatch_t* b,
-    rocksdb_column_family_handle_t* column_family,
-    int num_keys, const char* const* keys_list,
-    const size_t* keys_list_sizes) {
-  std::vector<Slice> key_slices(num_keys);
-  for (int i = 0; i < num_keys; i++) {
-    key_slices[i] = Slice(keys_list[i], keys_list_sizes[i]);
-  }
-  b->rep.Delete(column_family->rep, SliceParts(key_slices.data(), num_keys));
-}
-
-void rocksdb_writebatch_put_log_data(
-    rocksdb_writebatch_t* b,
-    const char* blob, size_t len) {
-  b->rep.PutLogData(Slice(blob, len));
-}
-
 void rocksdb_writebatch_iterate(
    rocksdb_writebatch_t* b,
    void* state,
@@ -1191,10 +1036,10 @@ void rocksdb_writebatch_iterate(
    void* state_;
    void (*put_)(void*, const char* k, size_t klen, const char* v, size_t vlen);
    void (*deleted_)(void*, const char* k, size_t klen);
-    virtual void Put(const Slice& key, const Slice& value) override {
+    virtual void Put(const Slice& key, const Slice& value) {
      (*put_)(state_, key.data(), key.size(), value.data(), value.size());
    }
-    virtual void Delete(const Slice& key) override {
+    virtual void Delete(const Slice& key) {
      (*deleted_)(state_, key.data(), key.size());
    }
  };
@@ -1268,26 +1113,6 @@ void rocksdb_block_based_options_set_whole_key_filtering(
  options->rep.whole_key_filtering = v;
 }

-void rocksdb_block_based_options_set_format_version(
-    rocksdb_block_based_table_options_t* options, int v) {
-  options->rep.format_version = v;
-}
-
-void rocksdb_block_based_options_set_index_type(
-    rocksdb_block_based_table_options_t* options, int v) {
-  options->rep.index_type = static_cast<BlockBasedTableOptions::IndexType>(v);
-}
-
-void rocksdb_block_based_options_set_hash_index_allow_collision(
-    rocksdb_block_based_table_options_t* options, unsigned char v) {
-  options->rep.hash_index_allow_collision = v;
-}
-
-void rocksdb_block_based_options_set_cache_index_and_filter_blocks(
-    rocksdb_block_based_table_options_t* options, unsigned char v) {
-  options->rep.cache_index_and_filter_blocks = v;
-}
-
 void rocksdb_options_set_block_based_table_factory(
    rocksdb_options_t *opt,
    rocksdb_block_based_table_options_t* table_options) {
@@ -1298,51 +1123,6 @@ void rocksdb_options_set_block_based_table_factory(
 }


-rocksdb_cuckoo_table_options_t*
-rocksdb_cuckoo_options_create() {
-  return new rocksdb_cuckoo_table_options_t;
-}
-
-void rocksdb_cuckoo_options_destroy(
-    rocksdb_cuckoo_table_options_t* options) {
-  delete options;
-}
-
-void rocksdb_cuckoo_options_set_hash_ratio(
-    rocksdb_cuckoo_table_options_t* options, double v) {
-  options->rep.hash_table_ratio = v;
-}
-
-void rocksdb_cuckoo_options_set_max_search_depth(
-    rocksdb_cuckoo_table_options_t* options, uint32_t v) {
-  options->rep.max_search_depth = v;
-}
-
-void rocksdb_cuckoo_options_set_cuckoo_block_size(
-    rocksdb_cuckoo_table_options_t* options, uint32_t v) {
-  options->rep.cuckoo_block_size = v;
-}
-
-void rocksdb_cuckoo_options_set_identity_as_first_hash(
-    rocksdb_cuckoo_table_options_t* options, unsigned char v) {
-  options->rep.identity_as_first_hash = v;
-}
-
-void rocksdb_cuckoo_options_set_use_module_hash(
-    rocksdb_cuckoo_table_options_t* options, unsigned char v) {
-  options->rep.use_module_hash = v;
-}
-
-void rocksdb_options_set_cuckoo_table_factory(
-    rocksdb_options_t *opt,
-    rocksdb_cuckoo_table_options_t* table_options) {
-  if (table_options) {
-    opt->rep.table_factory.reset(
-        rocksdb::NewCuckooTableFactory(table_options->rep));
-  }
-}
-
-
 rocksdb_options_t* rocksdb_options_create() {
  return new rocksdb_options_t;
 }
@@ -1395,6 +1175,11 @@ void rocksdb_options_set_merge_operator(
  opt->rep.merge_operator = std::shared_ptr<MergeOperator>(merge_operator);
 }

+void rocksdb_options_set_compaction_filter_factory_v2(
+    rocksdb_options_t* opt,
+    rocksdb_compactionfilterfactoryv2_t* compaction_filter_factory_v2) {
+  opt->rep.compaction_filter_factory_v2 = std::shared_ptr<CompactionFilterFactoryV2>(compaction_filter_factory_v2);
+}

 void rocksdb_options_set_create_if_missing(
    rocksdb_options_t* opt, unsigned char v) {
@@ -1431,11 +1216,6 @@ void rocksdb_options_set_info_log_level(
  opt->rep.info_log_level = static_cast<InfoLogLevel>(v);
 }

-void rocksdb_options_set_db_write_buffer_size(rocksdb_options_t* opt,
-                                              size_t s) {
-  opt->rep.db_write_buffer_size = s;
-}
-
 void rocksdb_options_set_write_buffer_size(rocksdb_options_t* opt, size_t s) {
  opt->rep.write_buffer_size = s;
 }
@@ -1444,10 +1224,6 @@ void rocksdb_options_set_max_open_files(rocksdb_options_t* opt, int n) {
  opt->rep.max_open_files = n;
 }

-void rocksdb_options_set_max_total_wal_size(rocksdb_options_t* opt, uint64_t n) {
-  opt->rep.max_total_wal_size = n;
-}
-
 void rocksdb_options_set_target_file_size_base(
    rocksdb_options_t* opt, uint64_t n) {
  opt->rep.target_file_size_base = n;
@@ -1509,8 +1285,10 @@ void rocksdb_options_set_level0_stop_writes_trigger(
  opt->rep.level0_stop_writes_trigger = n;
 }

-void rocksdb_options_set_max_mem_compaction_level(rocksdb_options_t* opt,
-                                                  int n) {}
+void rocksdb_options_set_max_mem_compaction_level(
+    rocksdb_options_t* opt, int n) {
+  opt->rep.max_mem_compaction_level = n;
+}

 void rocksdb_options_set_compression(rocksdb_options_t* opt, int t) {
  opt->rep.compression = static_cast<CompressionType>(t);
@@ -1572,9 +1350,10 @@ void rocksdb_options_set_manifest_preallocation_size(
  opt->rep.manifest_preallocation_size = v;
 }

-// noop
-void rocksdb_options_set_purge_redundant_kvs_while_flush(rocksdb_options_t* opt,
-                                                         unsigned char v) {}
+void rocksdb_options_set_purge_redundant_kvs_while_flush(
+    rocksdb_options_t* opt, unsigned char v) {
+  opt->rep.purge_redundant_kvs_while_flush = v;
+}

 void rocksdb_options_set_allow_os_buffer(rocksdb_options_t* opt,
                                         unsigned char v) {
@@ -1662,11 +1441,6 @@ void rocksdb_options_set_min_write_buffer_number_to_merge(rocksdb_options_t* opt
  opt->rep.min_write_buffer_number_to_merge = n;
 }

-void rocksdb_options_set_max_write_buffer_number_to_maintain(
-    rocksdb_options_t* opt, int n) {
-  opt->rep.max_write_buffer_number_to_maintain = n;
-}
-
 void rocksdb_options_set_max_background_compactions(rocksdb_options_t* opt, int n) {
  opt->rep.max_background_compactions = n;
 }
@@ -1712,7 +1486,7 @@ void rocksdb_options_set_table_cache_numshardbits(

 void rocksdb_options_set_table_cache_remove_scan_count_limit(
    rocksdb_options_t* opt, int v) {
-  // this option is deprecated
+  opt->rep.table_cache_remove_scan_count_limit = v;
 }

 void rocksdb_options_set_arena_block_size(
@@ -1831,17 +1605,10 @@ void rocksdb_options_set_fifo_compaction_options(
  opt->rep.compaction_options_fifo = fifo->rep;
 }

-char *rocksdb_options_statistics_get_string(rocksdb_options_t *opt) {
-  rocksdb::Statistics *statistics = opt->rep.statistics.get();
-  if (statistics) {
-    return strdup(statistics->ToString().c_str());
-  }
-  return nullptr;
-}
-
 /*
 TODO:
 DB::OpenForReadOnly
+DB::MultiGet
 DB::KeyMayExist
 DB::GetOptions
 DB::GetSortedWalFiles
@@ -1905,6 +1672,46 @@ void rocksdb_compactionfilterfactory_destroy(
  delete factory;
 }

+rocksdb_compactionfilterv2_t* rocksdb_compactionfilterv2_create(
+    void* state,
+    void (*destructor)(void*),
+    void (*filter)(void*, int level, size_t num_keys,
+                   const char* const* keys_list, const size_t* keys_list_sizes,
+                   const char* const* existing_values_list, const size_t* existing_values_list_sizes,
+                   char** new_values_list, size_t* new_values_list_sizes,
+                   unsigned char* to_delete_list),
+    const char* (*name)(void*)) {
+  rocksdb_compactionfilterv2_t* result = new rocksdb_compactionfilterv2_t;
+  result->state_ = state;
+  result->destructor_ = destructor;
+  result->filter_ = filter;
+  result->name_ = name;
+  return result;
+}
+
+void rocksdb_compactionfilterv2_destroy(rocksdb_compactionfilterv2_t* filter) {
+  delete filter;
+}
+
+rocksdb_compactionfilterfactoryv2_t* rocksdb_compactionfilterfactoryv2_create(
+    void* state,
+    rocksdb_slicetransform_t* prefix_extractor,
+    void (*destructor)(void*),
+    rocksdb_compactionfilterv2_t* (*create_compaction_filter_v2)(
+        void* state, const rocksdb_compactionfiltercontext_t* context),
+    const char* (*name)(void*)) {
+  rocksdb_compactionfilterfactoryv2_t* result = new rocksdb_compactionfilterfactoryv2_t(prefix_extractor);
+  result->state_ = state;
+  result->destructor_ = destructor;
+  result->create_compaction_filter_v2_ = create_compaction_filter_v2;
+  result->name_ = name;
+  return result;
+}
+
+void rocksdb_compactionfilterfactoryv2_destroy(rocksdb_compactionfilterfactoryv2_t* factory) {
+  delete factory;
+}
+
 rocksdb_comparator_t* rocksdb_comparator_create(
    void* state,
    void (*destructor)(void*),
@@ -1962,12 +1769,11 @@ rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom(int bits_per_key) {
  struct Wrapper : public rocksdb_filterpolicy_t {
    const FilterPolicy* rep_;
    ~Wrapper() { delete rep_; }
-    const char* Name() const override { return rep_->Name(); }
-    void CreateFilter(const Slice* keys, int n,
-                      std::string* dst) const override {
+    const char* Name() const { return rep_->Name(); }
+    void CreateFilter(const Slice* keys, int n, std::string* dst) const {
      return rep_->CreateFilter(keys, n, dst);
    }
-    bool KeyMayMatch(const Slice& key, const Slice& filter) const override {
+    bool KeyMayMatch(const Slice& key, const Slice& filter) const {
      return rep_->KeyMayMatch(key, filter);
    }
    static void DoNothing(void*) { }
@@ -2036,14 +1842,8 @@ void rocksdb_readoptions_set_snapshot(
 void rocksdb_readoptions_set_iterate_upper_bound(
    rocksdb_readoptions_t* opt,
    const char* key, size_t keylen) {
-  if (key == nullptr) {
-    opt->upper_bound = Slice();
-    opt->rep.iterate_upper_bound = nullptr;
-
-  } else {
-    opt->upper_bound = Slice(key, keylen);
-    opt->rep.iterate_upper_bound = &opt->upper_bound;
-  }
+  Slice prefix = Slice(key, keylen);
+  opt->rep.iterate_upper_bound = &prefix;
 }

 void rocksdb_readoptions_set_read_tier(
@@ -2112,10 +1912,6 @@ void rocksdb_env_set_high_priority_background_threads(rocksdb_env_t* env, int n)
  env->rep->SetBackgroundThreads(n, Env::HIGH);
 }

-void rocksdb_env_join_all_threads(rocksdb_env_t* env) {
-  env->rep->WaitForJoin();
-}
-
 void rocksdb_env_destroy(rocksdb_env_t* env) {
  if (!env->is_default) delete env->rep;
  delete env;
@@ -2153,14 +1949,16 @@ rocksdb_slicetransform_t* rocksdb_slicetransform_create_fixed_prefix(size_t pref
  struct Wrapper : public rocksdb_slicetransform_t {
    const SliceTransform* rep_;
    ~Wrapper() { delete rep_; }
-    const char* Name() const override { return rep_->Name(); }
-    Slice Transform(const Slice& src) const override {
+    const char* Name() const { return rep_->Name(); }
+    Slice Transform(const Slice& src) const {
      return rep_->Transform(src);
    }
-    bool InDomain(const Slice& src) const override {
+    bool InDomain(const Slice& src) const {
      return rep_->InDomain(src);
    }
-    bool InRange(const Slice& src) const override { return rep_->InRange(src); }
+    bool InRange(const Slice& src) const {
+      return rep_->InRange(src);
+    }
    static void DoNothing(void*) { }
  };
  Wrapper* wrapper = new Wrapper;
@@ -2170,27 +1968,6 @@ rocksdb_slicetransform_t* rocksdb_slicetransform_create_fixed_prefix(size_t pref
  return wrapper;
 }

-rocksdb_slicetransform_t* rocksdb_slicetransform_create_noop() {
-  struct Wrapper : public rocksdb_slicetransform_t {
-    const SliceTransform* rep_;
-    ~Wrapper() { delete rep_; }
-    const char* Name() const override { return rep_->Name(); }
-    Slice Transform(const Slice& src) const override {
-      return rep_->Transform(src);
-    }
-    bool InDomain(const Slice& src) const override {
-      return rep_->InDomain(src);
-    }
-    bool InRange(const Slice& src) const override { return rep_->InRange(src); }
-    static void DoNothing(void*) { }
-  };
-  Wrapper* wrapper = new Wrapper;
-  wrapper->rep_ = rocksdb::NewNoopTransform();
-  wrapper->state_ = nullptr;
-  wrapper->destructor_ = &Wrapper::DoNothing;
-  return wrapper;
-}
-
 rocksdb_universal_compaction_options_t* rocksdb_universal_compaction_options_create() {
  rocksdb_universal_compaction_options_t* result = new rocksdb_universal_compaction_options_t;
  result->rep = new rocksdb::CompactionOptionsUniversal;
@@ -2264,7 +2041,7 @@ void rocksdb_options_set_min_level_to_compress(rocksdb_options_t* opt, int level

 int rocksdb_livefiles_count(
  const rocksdb_livefiles_t* lf) {
-  return static_cast<int>(lf->rep.size());
+  return lf->rep.size();
 }

 const char* rocksdb_livefiles_name(
@@ -2306,17 +2083,6 @@ extern void rocksdb_livefiles_destroy(
  delete lf;
 }

-void rocksdb_get_options_from_string(const rocksdb_options_t* base_options,
-                                     const char* opts_str,
-                                     rocksdb_options_t* new_options,
-                                     char** errptr) {
-  SaveError(errptr,
-            GetOptionsFromString(base_options->rep, std::string(opts_str),
-                                 &new_options->rep));
-}
-
-void rocksdb_free(void* ptr) { free(ptr); }
-
 }  // end extern "C"

-#endif  // !ROCKSDB_LITE
+#endif  // ROCKSDB_LITE
@@ -2,8 +2,6 @@
   Use of this source code is governed by a BSD-style license that can be
   found in the LICENSE file. See the AUTHORS file for names of contributors. */

-#ifndef ROCKSDB_LITE  // Lite does not support C API
-
 #include "rocksdb/c.h"

 #include <stddef.h>
@@ -11,34 +9,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
-#ifndef OS_WIN
-#  include <unistd.h>
-#endif
-#include <inttypes.h>
-
-// Can not use port/port.h macros as this is a c file
-#ifdef OS_WIN
-
-#include <Windows.h>
-
-# define snprintf _snprintf
-
-// Ok for uniqueness
-int geteuid() {
-
-  int result = 0;
-
-  result = ((int)GetCurrentProcessId() << 16);
-  result |= (int)GetCurrentThreadId();
-
-  return result;
-}
-
-#endif
+#include <unistd.h>

 const char* phase = "";
 static char dbname[200];
-static char dbbackupname[200];

 static void StartPhase(const char* name) {
  fprintf(stderr, "=== Test %s\n", name);
@@ -158,7 +132,7 @@ static void CmpDestroy(void* arg) { }

 static int CmpCompare(void* arg, const char* a, size_t alen,
                      const char* b, size_t blen) {
-  size_t n = (alen < blen) ? alen : blen;
+  int n = (alen < blen) ? alen : blen;
  int r = memcmp(a, b, n);
  if (r == 0) {
    if (alen < blen) r = -1;
@@ -251,6 +225,79 @@ static rocksdb_t* CheckCompaction(rocksdb_t* db, rocksdb_options_t* options,
  return db;
 }

+// Custom compaction filter V2.
+static void CompactionFilterV2Destroy(void* arg) { }
+static const char* CompactionFilterV2Name(void* arg) {
+  return "TestCompactionFilterV2";
+}
+static void CompactionFilterV2Filter(
+    void* arg, int level, size_t num_keys,
+    const char* const* keys_list, const size_t* keys_list_sizes,
+    const char* const* existing_values_list, const size_t* existing_values_list_sizes,
+    char** new_values_list, size_t* new_values_list_sizes,
+    unsigned char* to_delete_list) {
+  size_t i;
+  for (i = 0; i < num_keys; i++) {
+    // If any value is "gc", it's removed.
+    if (existing_values_list_sizes[i] == 2 && memcmp(existing_values_list[i], "gc", 2) == 0) {
+      to_delete_list[i] = 1;
+    } else if (existing_values_list_sizes[i] == 6 && memcmp(existing_values_list[i], "gc all", 6) == 0) {
+      // If any value is "gc all", all keys are removed.
+      size_t j;
+      for (j = 0; j < num_keys; j++) {
+        to_delete_list[j] = 1;
+      }
+      return;
+    } else if (existing_values_list_sizes[i] == 6 && memcmp(existing_values_list[i], "change", 6) == 0) {
+      // If value is "change", set changed value to "changed".
+      size_t len;
+      len = strlen("changed");
+      new_values_list[i] = malloc(len);
+      memcpy(new_values_list[i], "changed", len);
+      new_values_list_sizes[i] = len;
+    } else {
+      // Otherwise, no keys are removed.
+    }
+  }
+}
+
+// Custom prefix extractor for compaction filter V2 which extracts first 3 characters.
+static void CFV2PrefixExtractorDestroy(void* arg) { }
+static char* CFV2PrefixExtractorTransform(void* arg, const char* key, size_t length, size_t* dst_length) {
+  // Verify keys are maximum length 4; this verifies fix for a
+  // prior bug which was passing the RocksDB-encoded key with
+  // logical timestamp suffix instead of parsed user key.
+  if (length > 4) {
+    fprintf(stderr, "%s:%d: %s: key %s is not user key\n", __FILE__, __LINE__, phase, key);
+    abort();
+  }
+  *dst_length = length < 3 ? length : 3;
+  return (char*)key;
+}
+static unsigned char CFV2PrefixExtractorInDomain(void* state, const char* key, size_t length) {
+  return 1;
+}
+static unsigned char CFV2PrefixExtractorInRange(void* state, const char* key, size_t length) {
+  return 1;
+}
+static const char* CFV2PrefixExtractorName(void* state) {
+  return "TestCFV2PrefixExtractor";
+}
+
+// Custom compaction filter factory V2.
+static void CompactionFilterFactoryV2Destroy(void* arg) {
+  rocksdb_slicetransform_destroy((rocksdb_slicetransform_t*)arg);
+}
+static const char* CompactionFilterFactoryV2Name(void* arg) {
+  return "TestCompactionFilterFactoryV2";
+}
+static rocksdb_compactionfilterv2_t* CompactionFilterFactoryV2Create(
+    void* state, const rocksdb_compactionfiltercontext_t* context) {
+  return rocksdb_compactionfilterv2_create(state, CompactionFilterV2Destroy,
+                                           CompactionFilterV2Filter,
+                                           CompactionFilterV2Name);
+}
+
 // Custom merge operator
 static void MergeOperatorDestroy(void* arg) { }
 static const char* MergeOperatorName(void* arg) {
@@ -299,11 +346,6 @@ int main(int argc, char** argv) {
           GetTempDir(),
           ((int) geteuid()));

-  snprintf(dbbackupname, sizeof(dbbackupname),
-           "%s/rocksdb_c_test-%d-backup",
-           GetTempDir(),
-           ((int) geteuid()));
-
  StartPhase("create_objects");
  cmp = rocksdb_comparator_create(NULL, CmpDestroy, CmpCompare, CmpName);
  env = rocksdb_create_default_env();
@@ -339,7 +381,7 @@ int main(int argc, char** argv) {
  Free(&err);

  StartPhase("open_error");
-  rocksdb_open(options, dbname, &err);
+  db = rocksdb_open(options, dbname, &err);
  CheckCondition(err != NULL);
  Free(&err);

@@ -354,41 +396,6 @@ int main(int argc, char** argv) {
  CheckNoError(err);
  CheckGet(db, roptions, "foo", "hello");

-  StartPhase("backup_and_restore");
-  {
-    rocksdb_destroy_db(options, dbbackupname, &err);
-    CheckNoError(err);
-
-    rocksdb_backup_engine_t *be = rocksdb_backup_engine_open(options, dbbackupname, &err);
-    CheckNoError(err);
-
-    rocksdb_backup_engine_create_new_backup(be, db, &err);
-    CheckNoError(err);
-
-    rocksdb_delete(db, woptions, "foo", 3, &err);
-    CheckNoError(err);
-
-    rocksdb_close(db);
-
-    rocksdb_destroy_db(options, dbname, &err);
-    CheckNoError(err);
-
-    rocksdb_restore_options_t *restore_options = rocksdb_restore_options_create();
-    rocksdb_restore_options_set_keep_log_files(restore_options, 0);
-    rocksdb_backup_engine_restore_db_from_latest_backup(be, dbname, dbname, restore_options, &err);
-    CheckNoError(err);
-    rocksdb_restore_options_destroy(restore_options);
-
-    rocksdb_options_set_error_if_exists(options, 0);
-    db = rocksdb_open(options, dbname, &err);
-    CheckNoError(err);
-    rocksdb_options_set_error_if_exists(options, 1);
-
-    CheckGet(db, roptions, "foo", "hello");
-
-    rocksdb_backup_engine_close(be);
-  }
-
  StartPhase("compactall");
  rocksdb_compact_range(db, NULL, 0, NULL, 0);
  CheckGet(db, roptions, "foo", "hello");
@@ -416,24 +423,6 @@ int main(int argc, char** argv) {
    rocksdb_writebatch_destroy(wb);
  }

-  StartPhase("writebatch_vectors");
-  {
-    rocksdb_writebatch_t* wb = rocksdb_writebatch_create();
-    const char* k_list[2] = { "z", "ap" };
-    const size_t k_sizes[2] = { 1, 2 };
-    const char* v_list[3] = { "x", "y", "z" };
-    const size_t v_sizes[3] = { 1, 1, 1 };
-    rocksdb_writebatch_putv(wb, 2, k_list, k_sizes, 3, v_list, v_sizes);
-    rocksdb_write(db, woptions, wb, &err);
-    CheckNoError(err);
-    CheckGet(db, roptions, "zap", "xyz");
-    rocksdb_writebatch_delete(wb, "zap", 3);
-    rocksdb_write(db, woptions, wb, &err);
-    CheckNoError(err);
-    CheckGet(db, roptions, "zap", NULL);
-    rocksdb_writebatch_destroy(wb);
-  }
-
  StartPhase("writebatch_rep");
  {
    rocksdb_writebatch_t* wb1 = rocksdb_writebatch_create();
@@ -474,33 +463,6 @@ int main(int argc, char** argv) {
    rocksdb_iter_destroy(iter);
  }

-  StartPhase("multiget");
-  {
-    const char* keys[3] = { "box", "foo", "notfound" };
-    const size_t keys_sizes[3] = { 3, 3, 8 };
-    char* vals[3];
-    size_t vals_sizes[3];
-    char* errs[3];
-    rocksdb_multi_get(db, roptions, 3, keys, keys_sizes, vals, vals_sizes, errs);
-
-    int i;
-    for (i = 0; i < 3; i++) {
-      CheckEqual(NULL, errs[i], 0);
-      switch (i) {
-      case 0:
-        CheckEqual("c", vals[i], vals_sizes[i]);
-        break;
-      case 1:
-        CheckEqual("hello", vals[i], vals_sizes[i]);
-        break;
-      case 2:
-        CheckEqual(NULL, vals[i], vals_sizes[i]);
-        break;
-      }
-      Free(&vals[i]);
-    }
-  }
-
  StartPhase("approximate_sizes");
  {
    int i;
@@ -649,6 +611,50 @@ int main(int argc, char** argv) {
    rocksdb_options_destroy(options_with_filter_factory);
  }

+  StartPhase("compaction_filter_v2");
+  {
+    rocksdb_compactionfilterfactoryv2_t* factory;
+    rocksdb_slicetransform_t* prefix_extractor;
+    prefix_extractor = rocksdb_slicetransform_create(
+        NULL, CFV2PrefixExtractorDestroy, CFV2PrefixExtractorTransform,
+        CFV2PrefixExtractorInDomain, CFV2PrefixExtractorInRange,
+        CFV2PrefixExtractorName);
+    factory = rocksdb_compactionfilterfactoryv2_create(
+        prefix_extractor, prefix_extractor, CompactionFilterFactoryV2Destroy,
+        CompactionFilterFactoryV2Create, CompactionFilterFactoryV2Name);
+    // Create new database
+    rocksdb_close(db);
+    rocksdb_destroy_db(options, dbname, &err);
+    rocksdb_options_set_compaction_filter_factory_v2(options, factory);
+    db = rocksdb_open(options, dbname, &err);
+    CheckNoError(err);
+    // Only foo2 is GC'd, foo3 is changed.
+    rocksdb_put(db, woptions, "foo1", 4, "no gc", 5, &err);
+    CheckNoError(err);
+    rocksdb_put(db, woptions, "foo2", 4, "gc", 2, &err);
+    CheckNoError(err);
+    rocksdb_put(db, woptions, "foo3", 4, "change", 6, &err);
+    CheckNoError(err);
+    // All bars are GC'd.
+    rocksdb_put(db, woptions, "bar1", 4, "no gc", 5, &err);
+    CheckNoError(err);
+    rocksdb_put(db, woptions, "bar2", 4, "gc all", 6, &err);
+    CheckNoError(err);
+    rocksdb_put(db, woptions, "bar3", 4, "no gc", 5, &err);
+    CheckNoError(err);
+    // Compact the DB to garbage collect.
+    rocksdb_compact_range(db, NULL, 0, NULL, 0);
+
+    // Verify foo entries.
+    CheckGet(db, roptions, "foo1", "no gc");
+    CheckGet(db, roptions, "foo2", NULL);
+    CheckGet(db, roptions, "foo3", "changed");
+    // Verify bar entries were all deleted.
+    CheckGet(db, roptions, "bar1", NULL);
+    CheckGet(db, roptions, "bar2", NULL);
+    CheckGet(db, roptions, "bar3", NULL);
+  }
+
  StartPhase("merge_operator");
  {
    rocksdb_mergeoperator_t* merge_operator;
@@ -730,36 +736,12 @@ int main(int argc, char** argv) {
    CheckGetCF(db, roptions, handles[1], "box", "c");
    rocksdb_writebatch_destroy(wb);

-    const char* keys[3] = { "box", "box", "barfooxx" };
-    const rocksdb_column_family_handle_t* get_handles[3] = { handles[0], handles[1], handles[1] };
-    const size_t keys_sizes[3] = { 3, 3, 8 };
-    char* vals[3];
-    size_t vals_sizes[3];
-    char* errs[3];
-    rocksdb_multi_get_cf(db, roptions, get_handles, 3, keys, keys_sizes, vals, vals_sizes, errs);
-
-    int i;
-    for (i = 0; i < 3; i++) {
-      CheckEqual(NULL, errs[i], 0);
-      switch (i) {
-      case 0:
-        CheckEqual(NULL, vals[i], vals_sizes[i]); // wrong cf
-        break;
-      case 1:
-        CheckEqual("c", vals[i], vals_sizes[i]); // bingo
-        break;
-      case 2:
-        CheckEqual(NULL, vals[i], vals_sizes[i]); // normal not found
-        break;
-      }
-      Free(&vals[i]);
-    }
-
    rocksdb_iterator_t* iter = rocksdb_create_iterator_cf(db, roptions, handles[1]);
    CheckCondition(!rocksdb_iter_valid(iter));
    rocksdb_iter_seek_to_first(iter);
    CheckCondition(rocksdb_iter_valid(iter));

+    int i;
    for (i = 0; rocksdb_iter_valid(iter) != 0; rocksdb_iter_next(iter)) {
      i++;
    }
@@ -819,87 +801,8 @@ int main(int argc, char** argv) {
    rocksdb_iter_get_error(iter, &err);
    CheckNoError(err);
    rocksdb_iter_destroy(iter);
-
-    rocksdb_close(db);
-    rocksdb_destroy_db(options, dbname, &err);
  }

-  StartPhase("cuckoo_options");
-  {
-    rocksdb_cuckoo_table_options_t* cuckoo_options;
-    cuckoo_options = rocksdb_cuckoo_options_create();
-    rocksdb_cuckoo_options_set_hash_ratio(cuckoo_options, 0.5);
-    rocksdb_cuckoo_options_set_max_search_depth(cuckoo_options, 200);
-    rocksdb_cuckoo_options_set_cuckoo_block_size(cuckoo_options, 10);
-    rocksdb_cuckoo_options_set_identity_as_first_hash(cuckoo_options, 1);
-    rocksdb_cuckoo_options_set_use_module_hash(cuckoo_options, 0);
-    rocksdb_options_set_cuckoo_table_factory(options, cuckoo_options);
-
-    db = rocksdb_open(options, dbname, &err);
-    CheckNoError(err);
-
-    rocksdb_cuckoo_options_destroy(cuckoo_options);
-  }
-
-  StartPhase("iterate_upper_bound");
-  {
-    // Create new empty database
-    rocksdb_close(db);
-    rocksdb_destroy_db(options, dbname, &err);
-    CheckNoError(err);
-
-    rocksdb_options_set_prefix_extractor(options, NULL);
-    db = rocksdb_open(options, dbname, &err);
-    CheckNoError(err);
-
-    rocksdb_put(db, woptions, "a",    1, "0",    1, &err); CheckNoError(err);
-    rocksdb_put(db, woptions, "foo",  3, "bar",  3, &err); CheckNoError(err);
-    rocksdb_put(db, woptions, "foo1", 4, "bar1", 4, &err); CheckNoError(err);
-    rocksdb_put(db, woptions, "g1",   2, "0",    1, &err); CheckNoError(err);
-
-    // testing basic case with no iterate_upper_bound and no prefix_extractor
-    {
-       rocksdb_readoptions_set_iterate_upper_bound(roptions, NULL, 0);
-       rocksdb_iterator_t* iter = rocksdb_create_iterator(db, roptions);
-
-       rocksdb_iter_seek(iter, "foo", 3);
-       CheckCondition(rocksdb_iter_valid(iter));
-       CheckIter(iter, "foo", "bar");
-
-       rocksdb_iter_next(iter);
-       CheckCondition(rocksdb_iter_valid(iter));
-       CheckIter(iter, "foo1", "bar1");
-
-       rocksdb_iter_next(iter);
-       CheckCondition(rocksdb_iter_valid(iter));
-       CheckIter(iter, "g1", "0");
-
-       rocksdb_iter_destroy(iter);
-    }
-
-    // testing iterate_upper_bound and forward iterator
-    // to make sure it stops at bound
-    {
-       // iterate_upper_bound points beyond the last expected entry
-       rocksdb_readoptions_set_iterate_upper_bound(roptions, "foo2", 4);
-
-       rocksdb_iterator_t* iter = rocksdb_create_iterator(db, roptions);
-
-       rocksdb_iter_seek(iter, "foo", 3);
-       CheckCondition(rocksdb_iter_valid(iter));
-       CheckIter(iter, "foo", "bar");
-
-       rocksdb_iter_next(iter);
-       CheckCondition(rocksdb_iter_valid(iter));
-       CheckIter(iter, "foo1", "bar1");
-
-       rocksdb_iter_next(iter);
-       // should stop here...
-       CheckCondition(!rocksdb_iter_valid(iter));
-
-       rocksdb_iter_destroy(iter);
-    }
-  }

  StartPhase("cleanup");
  rocksdb_close(db);
@@ -914,13 +817,3 @@ int main(int argc, char** argv) {
  fprintf(stderr, "PASS\n");
  return 0;
 }
-
-#else
-#include <stdio.h>
-
-int main() {
-  fprintf(stderr, "SKIPPED\n");
-  return 0;
-}
-
-#endif  // !ROCKSDB_LITE
@@ -19,26 +19,51 @@
 #include <algorithm>
 #include <limits>

-#include "db/compaction_picker.h"
 #include "db/db_impl.h"
 #include "db/job_context.h"
 #include "db/version_set.h"
-#include "db/writebuffer.h"
 #include "db/internal_stats.h"
+#include "db/compaction_picker.h"
 #include "db/table_properties_collector.h"
-#include "db/version_set.h"
 #include "db/write_controller.h"
 #include "util/autovector.h"
-#include "util/compression.h"
 #include "util/hash_skiplist_rep.h"
 #include "util/options_helper.h"
-#include "util/thread_status_util.h"
-#include "util/xfunc.h"

 namespace rocksdb {

+namespace {
+// This function computes the amount of time in microseconds by which a write
+// should be delayed based on the number of level-0 files according to the
+// following formula:
+// if n < bottom, return 0;
+// if n >= top, return 1000;
+// otherwise, let r = (n - bottom) /
+//                    (top - bottom)
+//  and return r^2 * 1000.
+// The goal of this formula is to gradually increase the rate at which writes
+// are slowed. We also tried linear delay (r * 1000), but it seemed to do
+// slightly worse. There is no other particular reason for choosing quadratic.
+uint64_t SlowdownAmount(int n, double bottom, double top) {
+  uint64_t delay;
+  if (n >= top) {
+    delay = 1000;
+  } else if (n < bottom) {
+    delay = 0;
+  } else {
+    // If we are here, we know that:
+    //   level0_start_slowdown <= n < level0_slowdown
+    // since the previous two conditions are false.
+    double how_much = static_cast<double>(n - bottom) / (top - bottom);
+    delay = std::max(how_much * how_much * 1000, 100.0);
+  }
+  assert(delay <= 1000);
+  return delay;
+}
+}  // namespace
+
 ColumnFamilyHandleImpl::ColumnFamilyHandleImpl(
-    ColumnFamilyData* column_family_data, DBImpl* db, InstrumentedMutex* mutex)
+    ColumnFamilyData* column_family_data, DBImpl* db, port::Mutex* mutex)
    : cfd_(column_family_data), db_(db), mutex_(mutex) {
  if (cfd_ != nullptr) {
    cfd_->Ref();
@@ -47,9 +72,7 @@ ColumnFamilyHandleImpl::ColumnFamilyHandleImpl(

 ColumnFamilyHandleImpl::~ColumnFamilyHandleImpl() {
  if (cfd_ != nullptr) {
-    // Job id == 0 means that this is not our background process, but rather
-    // user thread
-    JobContext job_context(0);
+    JobContext job_context;
    mutex_->Lock();
    if (cfd_->Unref()) {
      delete cfd_;
@@ -59,60 +82,16 @@ ColumnFamilyHandleImpl::~ColumnFamilyHandleImpl() {
    if (job_context.HaveSomethingToDelete()) {
      db_->PurgeObsoleteFiles(job_context);
    }
-    job_context.Clean();
  }
 }

 uint32_t ColumnFamilyHandleImpl::GetID() const { return cfd()->GetID(); }

-const std::string& ColumnFamilyHandleImpl::GetName() const {
-  return cfd()->GetName();
-}
-
 const Comparator* ColumnFamilyHandleImpl::user_comparator() const {
  return cfd()->user_comparator();
 }

-void GetIntTblPropCollectorFactory(
-    const ColumnFamilyOptions& cf_options,
-    std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
-        int_tbl_prop_collector_factories) {
-  auto& collector_factories = cf_options.table_properties_collector_factories;
-  for (size_t i = 0; i < cf_options.table_properties_collector_factories.size();
-       ++i) {
-    assert(collector_factories[i]);
-    int_tbl_prop_collector_factories->emplace_back(
-        new UserKeyTablePropertiesCollectorFactory(collector_factories[i]));
-  }
-  // Add collector to collect internal key statistics
-  int_tbl_prop_collector_factories->emplace_back(
-      new InternalKeyPropertiesCollectorFactory);
-}
-
-Status CheckCompressionSupported(const ColumnFamilyOptions& cf_options) {
-  if (!cf_options.compression_per_level.empty()) {
-    for (size_t level = 0; level < cf_options.compression_per_level.size();
-         ++level) {
-      if (!CompressionTypeSupported(cf_options.compression_per_level[level])) {
-        return Status::InvalidArgument(
-            "Compression type " +
-            CompressionTypeToString(cf_options.compression_per_level[level]) +
-            " is not linked with the binary.");
-      }
-    }
-  } else {
-    if (!CompressionTypeSupported(cf_options.compression)) {
-      return Status::InvalidArgument(
-          "Compression type " +
-          CompressionTypeToString(cf_options.compression) +
-          " is not linked with the binary.");
-    }
-  }
-  return Status::OK();
-}
-
-ColumnFamilyOptions SanitizeOptions(const DBOptions& db_options,
-                                    const InternalKeyComparator* icmp,
+ColumnFamilyOptions SanitizeOptions(const InternalKeyComparator* icmp,
                                    const ColumnFamilyOptions& src) {
  ColumnFamilyOptions result = src;
  result.comparator = icmp;
@@ -131,28 +110,16 @@ ColumnFamilyOptions SanitizeOptions(const DBOptions& db_options,
  result.min_write_buffer_number_to_merge =
      std::min(result.min_write_buffer_number_to_merge,
               result.max_write_buffer_number - 1);
-  if (result.num_levels < 1) {
-    result.num_levels = 1;
+  result.compression_per_level = src.compression_per_level;
+  if (result.max_mem_compaction_level >= result.num_levels) {
+    result.max_mem_compaction_level = result.num_levels - 1;
  }
-  if (result.compaction_style == kCompactionStyleLevel &&
-      result.num_levels < 2) {
-    result.num_levels = 2;
+  if (result.soft_rate_limit > result.hard_rate_limit) {
+    result.soft_rate_limit = result.hard_rate_limit;
  }
  if (result.max_write_buffer_number < 2) {
    result.max_write_buffer_number = 2;
  }
-  if (result.max_write_buffer_number_to_maintain < 0) {
-    result.max_write_buffer_number_to_maintain = result.max_write_buffer_number;
-  }
-  XFUNC_TEST("memtablelist_history", "transaction_xftest_SanitizeOptions",
-             xf_transaction_set_memtable_history1,
-             xf_transaction_set_memtable_history,
-             &result.max_write_buffer_number_to_maintain);
-  XFUNC_TEST("memtablelist_history_clear", "transaction_xftest_SanitizeOptions",
-             xf_transaction_clear_memtable_history1,
-             xf_transaction_clear_memtable_history,
-             &result.max_write_buffer_number_to_maintain);
-
  if (!result.prefix_extractor) {
    assert(result.memtable_factory);
    Slice name = result.memtable_factory->Name();
@@ -162,6 +129,22 @@ ColumnFamilyOptions SanitizeOptions(const DBOptions& db_options,
    }
  }

+  // -- Sanitize the table properties collector
+  // All user defined properties collectors will be wrapped by
+  // UserKeyTablePropertiesCollector since for them they only have the
+  // knowledge of the user keys; internal keys are invisible to them.
+  auto& collector_factories = result.table_properties_collector_factories;
+  for (size_t i = 0; i < result.table_properties_collector_factories.size();
+       ++i) {
+    assert(collector_factories[i]);
+    collector_factories[i] =
+        std::make_shared<UserKeyTablePropertiesCollectorFactory>(
+            collector_factories[i]);
+  }
+  // Add collector to collect internal key statistics
+  collector_factories.push_back(
+      std::make_shared<InternalKeyPropertiesCollectorFactory>());
+
  if (result.compaction_style == kCompactionStyleFIFO) {
    result.num_levels = 1;
    // since we delete level0 files in FIFO compaction when there are too many
@@ -171,47 +154,6 @@ ColumnFamilyOptions SanitizeOptions(const DBOptions& db_options,
    result.level0_stop_writes_trigger = std::numeric_limits<int>::max();
  }

-  if (result.level0_stop_writes_trigger <
-          result.level0_slowdown_writes_trigger ||
-      result.level0_slowdown_writes_trigger <
-          result.level0_file_num_compaction_trigger) {
-    Warn(db_options.info_log.get(),
-         "This condition must be satisfied: "
-         "level0_stop_writes_trigger(%d) >= "
-         "level0_slowdown_writes_trigger(%d) >= "
-         "level0_file_num_compaction_trigger(%d)",
-         result.level0_stop_writes_trigger,
-         result.level0_slowdown_writes_trigger,
-         result.level0_file_num_compaction_trigger);
-    if (result.level0_slowdown_writes_trigger <
-        result.level0_file_num_compaction_trigger) {
-      result.level0_slowdown_writes_trigger =
-          result.level0_file_num_compaction_trigger;
-    }
-    if (result.level0_stop_writes_trigger <
-        result.level0_slowdown_writes_trigger) {
-      result.level0_stop_writes_trigger = result.level0_slowdown_writes_trigger;
-    }
-    Warn(db_options.info_log.get(),
-         "Adjust the value to "
-         "level0_stop_writes_trigger(%d)"
-         "level0_slowdown_writes_trigger(%d)"
-         "level0_file_num_compaction_trigger(%d)",
-         result.level0_stop_writes_trigger,
-         result.level0_slowdown_writes_trigger,
-         result.level0_file_num_compaction_trigger);
-  }
-  if (result.level_compaction_dynamic_level_bytes) {
-    if (result.compaction_style != kCompactionStyleLevel ||
-        db_options.db_paths.size() > 1U) {
-      // 1. level_compaction_dynamic_level_bytes only makes sense for
-      //    level-based compaction.
-      // 2. we don't yet know how to make both of this feature and multiple
-      //    DB path work.
-      result.level_compaction_dynamic_level_bytes = false;
-    }
-  }
-
  return result;
 }

@@ -232,7 +174,7 @@ SuperVersion* SuperVersion::Ref() {

 bool SuperVersion::Unref() {
  // fetch_sub returns the previous value of ref
-  uint32_t previous_refs = refs.fetch_sub(1);
+  uint32_t previous_refs = refs.fetch_sub(1, std::memory_order_relaxed);
  assert(previous_refs > 0);
  return previous_refs == 1;
 }
@@ -274,11 +216,13 @@ void SuperVersionUnrefHandle(void* ptr) {
 }
 }  // anonymous namespace

-ColumnFamilyData::ColumnFamilyData(
-    uint32_t id, const std::string& name, Version* _dummy_versions,
-    Cache* _table_cache, WriteBuffer* write_buffer,
-    const ColumnFamilyOptions& cf_options, const DBOptions* db_options,
-    const EnvOptions& env_options, ColumnFamilySet* column_family_set)
+ColumnFamilyData::ColumnFamilyData(uint32_t id, const std::string& name,
+                                   Version* _dummy_versions,
+                                   Cache* _table_cache,
+                                   const ColumnFamilyOptions& cf_options,
+                                   const DBOptions* db_options,
+                                   const EnvOptions& env_options,
+                                   ColumnFamilySet* column_family_set)
    : id_(id),
      name_(name),
      dummy_versions_(_dummy_versions),
@@ -286,68 +230,41 @@ ColumnFamilyData::ColumnFamilyData(
      refs_(0),
      dropped_(false),
      internal_comparator_(cf_options.comparator),
-      options_(*db_options,
-               SanitizeOptions(*db_options, &internal_comparator_, cf_options)),
+      options_(*db_options, SanitizeOptions(&internal_comparator_, cf_options)),
      ioptions_(options_),
      mutable_cf_options_(options_, ioptions_),
-      write_buffer_(write_buffer),
      mem_(nullptr),
-      imm_(options_.min_write_buffer_number_to_merge,
-           options_.max_write_buffer_number_to_maintain),
+      imm_(options_.min_write_buffer_number_to_merge),
      super_version_(nullptr),
      super_version_number_(0),
      local_sv_(new ThreadLocalPtr(&SuperVersionUnrefHandle)),
      next_(nullptr),
      prev_(nullptr),
      log_number_(0),
-      column_family_set_(column_family_set),
-      pending_flush_(false),
-      pending_compaction_(false) {
+      column_family_set_(column_family_set) {
  Ref();

-  // Convert user defined table properties collector factories to internal ones.
-  GetIntTblPropCollectorFactory(options_, &int_tbl_prop_collector_factories_);
-
  // if _dummy_versions is nullptr, then this is a dummy column family.
  if (_dummy_versions != nullptr) {
    internal_stats_.reset(
        new InternalStats(ioptions_.num_levels, db_options->env, this));
    table_cache_.reset(new TableCache(ioptions_, env_options, _table_cache));
-    if (ioptions_.compaction_style == kCompactionStyleLevel) {
-      compaction_picker_.reset(
-          new LevelCompactionPicker(ioptions_, &internal_comparator_));
-#ifndef ROCKSDB_LITE
-    } else if (ioptions_.compaction_style == kCompactionStyleUniversal) {
+    if (ioptions_.compaction_style == kCompactionStyleUniversal) {
      compaction_picker_.reset(
          new UniversalCompactionPicker(ioptions_, &internal_comparator_));
-    } else if (ioptions_.compaction_style == kCompactionStyleFIFO) {
-      compaction_picker_.reset(
-          new FIFOCompactionPicker(ioptions_, &internal_comparator_));
-    } else if (ioptions_.compaction_style == kCompactionStyleNone) {
-      compaction_picker_.reset(new NullCompactionPicker(
-          ioptions_, &internal_comparator_));
-      Log(InfoLogLevel::WARN_LEVEL, ioptions_.info_log,
-          "Column family %s does not use any background compaction. "
-          "Compactions can only be done via CompactFiles\n",
-          GetName().c_str());
-#endif  // !ROCKSDB_LITE
-    } else {
-      Log(InfoLogLevel::ERROR_LEVEL, ioptions_.info_log,
-          "Unable to recognize the specified compaction style %d. "
-          "Column family %s will use kCompactionStyleLevel.\n",
-          ioptions_.compaction_style, GetName().c_str());
+    } else if (ioptions_.compaction_style == kCompactionStyleLevel) {
      compaction_picker_.reset(
          new LevelCompactionPicker(ioptions_, &internal_comparator_));
+    } else {
+      assert(ioptions_.compaction_style == kCompactionStyleFIFO);
+      compaction_picker_.reset(
+          new FIFOCompactionPicker(ioptions_, &internal_comparator_));
    }

-    if (column_family_set_->NumberOfColumnFamilies() < 10) {
-      Log(InfoLogLevel::INFO_LEVEL, ioptions_.info_log,
-          "--------------- Options for column family [%s]:\n", name.c_str());
-      options_.DumpCFOptions(ioptions_.info_log);
-    } else {
-      Log(InfoLogLevel::INFO_LEVEL, ioptions_.info_log,
-          "\t(skipping printing options)\n");
-    }
+    Log(InfoLogLevel::INFO_LEVEL,
+        ioptions_.info_log, "Options for column family \"%s\":\n",
+        name.c_str());
+    options_.Dump(ioptions_.info_log);
  }

  RecalculateWriteStallConditions(mutable_cf_options_);
@@ -355,17 +272,16 @@ ColumnFamilyData::ColumnFamilyData(

 // DB mutex held
 ColumnFamilyData::~ColumnFamilyData() {
-  assert(refs_.load(std::memory_order_relaxed) == 0);
+  assert(refs_ == 0);
  // remove from linked list
  auto prev = prev_;
  auto next = next_;
  prev->next_ = next;
  next->prev_ = prev;

-  if (!dropped_ && column_family_set_ != nullptr) {
-    // If it's dropped, it's already removed from column family set
-    // If column_family_set_ == nullptr, this is dummy CFD and not in
-    // ColumnFamilySet
+  // it's nullptr for dummy CFD
+  if (column_family_set_ != nullptr) {
+    // remove from column_family_set
    column_family_set_->RemoveColumnFamily(this);
  }

@@ -373,11 +289,6 @@ ColumnFamilyData::~ColumnFamilyData() {
    current_->Unref();
  }

-  // It would be wrong if this ColumnFamilyData is in flush_queue_ or
-  // compaction_queue_ and we destroyed it
-  assert(!pending_flush_);
-  assert(!pending_compaction_);
-
  if (super_version_ != nullptr) {
    // Release SuperVersion reference kept in ThreadLocalPtr.
    // This must be done outside of mutex_ since unref handler can lock mutex.
@@ -410,54 +321,65 @@ ColumnFamilyData::~ColumnFamilyData() {
  }
 }

-void ColumnFamilyData::SetDropped() {
-  // can't drop default CF
-  assert(id_ != 0);
-  dropped_ = true;
-  write_controller_token_.reset();
-
-  // remove from column_family_set
-  column_family_set_->RemoveColumnFamily(this);
-}
-
 void ColumnFamilyData::RecalculateWriteStallConditions(
      const MutableCFOptions& mutable_cf_options) {
  if (current_ != nullptr) {
    auto* vstorage = current_->storage_info();
    const double score = vstorage->max_compaction_score();
    const int max_level = vstorage->max_compaction_score_level();
+
    auto write_controller = column_family_set_->write_controller_;

-    if (imm()->NumNotFlushed() >= mutable_cf_options.max_write_buffer_number) {
+    if (imm()->size() >= mutable_cf_options.max_write_buffer_number) {
      write_controller_token_ = write_controller->GetStopToken();
      internal_stats_->AddCFStats(InternalStats::MEMTABLE_COMPACTION, 1);
      Log(InfoLogLevel::WARN_LEVEL, ioptions_.info_log,
          "[%s] Stopping writes because we have %d immutable memtables "
          "(waiting for flush), max_write_buffer_number is set to %d",
-          name_.c_str(), imm()->NumNotFlushed(),
+          name_.c_str(), imm()->size(),
          mutable_cf_options.max_write_buffer_number);
-    } else if (vstorage->l0_delay_trigger_count() >=
+    } else if (vstorage->NumLevelFiles(0) >=
               mutable_cf_options.level0_stop_writes_trigger) {
      write_controller_token_ = write_controller->GetStopToken();
      internal_stats_->AddCFStats(InternalStats::LEVEL0_NUM_FILES, 1);
      Log(InfoLogLevel::WARN_LEVEL, ioptions_.info_log,
          "[%s] Stopping writes because we have %d level-0 files",
-          name_.c_str(), vstorage->l0_delay_trigger_count());
+          name_.c_str(), vstorage->NumLevelFiles(0));
    } else if (mutable_cf_options.level0_slowdown_writes_trigger >= 0 &&
-               vstorage->l0_delay_trigger_count() >=
+               vstorage->NumLevelFiles(0) >=
                   mutable_cf_options.level0_slowdown_writes_trigger) {
-      write_controller_token_ = write_controller->GetDelayToken();
-      internal_stats_->AddCFStats(InternalStats::LEVEL0_SLOWDOWN, 1);
+      uint64_t slowdown =
+          SlowdownAmount(vstorage->NumLevelFiles(0),
+                         mutable_cf_options.level0_slowdown_writes_trigger,
+                         mutable_cf_options.level0_stop_writes_trigger);
+      write_controller_token_ = write_controller->GetDelayToken(slowdown);
+      internal_stats_->AddCFStats(InternalStats::LEVEL0_SLOWDOWN, slowdown);
      Log(InfoLogLevel::WARN_LEVEL, ioptions_.info_log,
-          "[%s] Stalling writes because we have %d level-0 files",
-          name_.c_str(), vstorage->l0_delay_trigger_count());
+          "[%s] Stalling writes because we have %d level-0 files (%" PRIu64
+          "us)",
+          name_.c_str(), vstorage->NumLevelFiles(0), slowdown);
+    } else if (mutable_cf_options.hard_rate_limit > 1.0 &&
+               score > mutable_cf_options.hard_rate_limit) {
+      uint64_t kHardLimitSlowdown = 1000;
+      write_controller_token_ =
+          write_controller->GetDelayToken(kHardLimitSlowdown);
+      internal_stats_->RecordLevelNSlowdown(max_level, kHardLimitSlowdown,
+                                            false);
+      Log(InfoLogLevel::WARN_LEVEL, ioptions_.info_log,
+          "[%s] Stalling writes because we hit hard limit on level %d. "
+          "(%" PRIu64 "us)",
+          name_.c_str(), max_level, kHardLimitSlowdown);
    } else if (mutable_cf_options.soft_rate_limit > 0.0 &&
               score > mutable_cf_options.soft_rate_limit) {
-      write_controller_token_ = write_controller->GetDelayToken();
-      internal_stats_->RecordLevelNSlowdown(max_level, true);
+      uint64_t slowdown = SlowdownAmount(score,
+          mutable_cf_options.soft_rate_limit,
+          mutable_cf_options.hard_rate_limit);
+      write_controller_token_ = write_controller->GetDelayToken(slowdown);
+      internal_stats_->RecordLevelNSlowdown(max_level, slowdown, true);
      Log(InfoLogLevel::WARN_LEVEL, ioptions_.info_log,
-          "[%s] Stalling writes because we hit soft limit on level %d",
-          name_.c_str(), max_level);
+          "[%s] Stalling writes because we hit soft limit on level %d (%" PRIu64
+          "us)",
+          name_.c_str(), max_level, slowdown);
    } else {
      write_controller_token_.reset();
    }
@@ -472,30 +394,16 @@ void ColumnFamilyData::SetCurrent(Version* current_version) {
  current_ = current_version;
 }

-uint64_t ColumnFamilyData::GetNumLiveVersions() const {
-  return VersionSet::GetNumLiveVersions(dummy_versions_);
-}
-
-MemTable* ColumnFamilyData::ConstructNewMemtable(
-    const MutableCFOptions& mutable_cf_options, SequenceNumber earliest_seq) {
-  assert(current_ != nullptr);
-  return new MemTable(internal_comparator_, ioptions_, mutable_cf_options,
-                      write_buffer_, earliest_seq);
-}
-
 void ColumnFamilyData::CreateNewMemtable(
-    const MutableCFOptions& mutable_cf_options, SequenceNumber earliest_seq) {
+    const MutableCFOptions& mutable_cf_options) {
+  assert(current_ != nullptr);
  if (mem_ != nullptr) {
    delete mem_->Unref();
  }
-  SetMemtable(ConstructNewMemtable(mutable_cf_options, earliest_seq));
+  mem_ = new MemTable(internal_comparator_, ioptions_, mutable_cf_options);
  mem_->Ref();
 }

-bool ColumnFamilyData::NeedsCompaction() const {
-  return compaction_picker_->NeedsCompaction(current_->storage_info());
-}
-
 Compaction* ColumnFamilyData::PickCompaction(
    const MutableCFOptions& mutable_options, LogBuffer* log_buffer) {
  auto* result = compaction_picker_->PickCompaction(
@@ -506,9 +414,6 @@ Compaction* ColumnFamilyData::PickCompaction(
  return result;
 }

-const int ColumnFamilyData::kCompactAllLevels = -1;
-const int ColumnFamilyData::kCompactToBaseLevel = -2;
-
 Compaction* ColumnFamilyData::CompactRange(
    const MutableCFOptions& mutable_cf_options,
    int input_level, int output_level, uint32_t output_path_id,
@@ -524,7 +429,7 @@ Compaction* ColumnFamilyData::CompactRange(
 }

 SuperVersion* ColumnFamilyData::GetReferencedSuperVersion(
-    InstrumentedMutex* db_mutex) {
+    port::Mutex* db_mutex) {
  SuperVersion* sv = nullptr;
  sv = GetThreadLocalSuperVersion(db_mutex);
  sv->Ref();
@@ -535,7 +440,7 @@ SuperVersion* ColumnFamilyData::GetReferencedSuperVersion(
 }

 SuperVersion* ColumnFamilyData::GetThreadLocalSuperVersion(
-    InstrumentedMutex* db_mutex) {
+    port::Mutex* db_mutex) {
  SuperVersion* sv = nullptr;
  // The SuperVersion is cached in thread local storage to avoid acquiring
  // mutex when SuperVersion does not change since the last use. When a new
@@ -586,7 +491,7 @@ bool ColumnFamilyData::ReturnThreadLocalSuperVersion(SuperVersion* sv) {
  void* expected = SuperVersion::kSVInUse;
  if (local_sv_->CompareAndSwap(static_cast<void*>(sv), expected)) {
    // When we see kSVInUse in the ThreadLocal, we are sure ThreadLocal
-    // storage has not been altered and no Scrape has happened. The
+    // storage has not been altered and no Scrape has happend. The
    // SuperVersion is still current.
    return true;
  } else {
@@ -599,13 +504,13 @@ bool ColumnFamilyData::ReturnThreadLocalSuperVersion(SuperVersion* sv) {
 }

 SuperVersion* ColumnFamilyData::InstallSuperVersion(
-    SuperVersion* new_superversion, InstrumentedMutex* db_mutex) {
+    SuperVersion* new_superversion, port::Mutex* db_mutex) {
  db_mutex->AssertHeld();
  return InstallSuperVersion(new_superversion, db_mutex, mutable_cf_options_);
 }

 SuperVersion* ColumnFamilyData::InstallSuperVersion(
-    SuperVersion* new_superversion, InstrumentedMutex* db_mutex,
+    SuperVersion* new_superversion, port::Mutex* db_mutex,
    const MutableCFOptions& mutable_cf_options) {
  new_superversion->db_mutex = db_mutex;
  new_superversion->mutable_cf_options = mutable_cf_options;
@@ -642,7 +547,6 @@ void ColumnFamilyData::ResetThreadLocalSuperVersions() {
  }
 }

-#ifndef ROCKSDB_LITE
 Status ColumnFamilyData::SetOptions(
      const std::unordered_map<std::string, std::string>& options_map) {
  MutableCFOptions new_mutable_cf_options;
@@ -654,16 +558,14 @@ Status ColumnFamilyData::SetOptions(
  }
  return s;
 }
-#endif  // ROCKSDB_LITE

 ColumnFamilySet::ColumnFamilySet(const std::string& dbname,
                                 const DBOptions* db_options,
                                 const EnvOptions& env_options,
                                 Cache* table_cache,
-                                 WriteBuffer* write_buffer,
                                 WriteController* write_controller)
    : max_column_family_(0),
-      dummy_cfd_(new ColumnFamilyData(0, "", nullptr, nullptr, nullptr,
+      dummy_cfd_(new ColumnFamilyData(0, "", nullptr, nullptr,
                                      ColumnFamilyOptions(), db_options,
                                      env_options, nullptr)),
      default_cfd_cache_(nullptr),
@@ -671,8 +573,8 @@ ColumnFamilySet::ColumnFamilySet(const std::string& dbname,
      db_options_(db_options),
      env_options_(env_options),
      table_cache_(table_cache),
-      write_buffer_(write_buffer),
-      write_controller_(write_controller) {
+      write_controller_(write_controller),
+      spin_lock_(ATOMIC_FLAG_INIT) {
  // initialize linked list
  dummy_cfd_->prev_ = dummy_cfd_;
  dummy_cfd_->next_ = dummy_cfd_;
@@ -729,17 +631,18 @@ size_t ColumnFamilySet::NumberOfColumnFamilies() const {
  return column_families_.size();
 }

-// under a DB mutex AND write thread
+// under a DB mutex
 ColumnFamilyData* ColumnFamilySet::CreateColumnFamily(
    const std::string& name, uint32_t id, Version* dummy_versions,
    const ColumnFamilyOptions& options) {
  assert(column_families_.find(name) == column_families_.end());
  ColumnFamilyData* new_cfd =
-      new ColumnFamilyData(id, name, dummy_versions, table_cache_,
-                           write_buffer_, options, db_options_,
-                           env_options_, this);
+      new ColumnFamilyData(id, name, dummy_versions, table_cache_, options,
+                           db_options_, env_options_, this);
+  Lock();
  column_families_.insert({name, id});
  column_family_data_.insert({id, new_cfd});
+  Unlock();
  max_column_family_ = std::max(max_column_family_, id);
  // add to linked list
  new_cfd->next_ = dummy_cfd_;
@@ -753,11 +656,19 @@ ColumnFamilyData* ColumnFamilySet::CreateColumnFamily(
  return new_cfd;
 }

+void ColumnFamilySet::Lock() {
+  // spin lock
+  while (spin_lock_.test_and_set(std::memory_order_acquire)) {
+  }
+}
+
+void ColumnFamilySet::Unlock() { spin_lock_.clear(std::memory_order_release); }
+
 // REQUIRES: DB mutex held
 void ColumnFamilySet::FreeDeadColumnFamilies() {
  autovector<ColumnFamilyData*> to_delete;
  for (auto cfd = dummy_cfd_->next_; cfd != dummy_cfd_; cfd = cfd->next_) {
-    if (cfd->refs_.load(std::memory_order_relaxed) == 0) {
+    if (cfd->refs_ == 0) {
      to_delete.push_back(cfd);
    }
  }
@@ -767,21 +678,30 @@ void ColumnFamilySet::FreeDeadColumnFamilies() {
  }
 }

-// under a DB mutex AND from a write thread
+// under a DB mutex
 void ColumnFamilySet::RemoveColumnFamily(ColumnFamilyData* cfd) {
  auto cfd_iter = column_family_data_.find(cfd->GetID());
  assert(cfd_iter != column_family_data_.end());
+  Lock();
  column_family_data_.erase(cfd_iter);
  column_families_.erase(cfd->GetName());
+  Unlock();
 }

-// under a DB mutex OR from a write thread
 bool ColumnFamilyMemTablesImpl::Seek(uint32_t column_family_id) {
  if (column_family_id == 0) {
    // optimization for common case
    current_ = column_family_set_->GetDefault();
  } else {
+    // maybe outside of db mutex, should lock
+    column_family_set_->Lock();
    current_ = column_family_set_->GetColumnFamily(column_family_id);
+    column_family_set_->Unlock();
+    // TODO(icanadi) Maybe remove column family from the hash table when it's
+    // dropped?
+    if (current_ != nullptr && current_->IsDropped()) {
+      current_ = nullptr;
+    }
  }
  handle_.SetCFD(current_);
  return current_ != nullptr;
@@ -797,6 +717,11 @@ MemTable* ColumnFamilyMemTablesImpl::GetMemTable() const {
  return current_->mem();
 }

+const Options* ColumnFamilyMemTablesImpl::GetOptions() const {
+  assert(current_ != nullptr);
+  return current_->options();
+}
+
 ColumnFamilyHandle* ColumnFamilyMemTablesImpl::GetColumnFamilyHandle() {
  assert(current_ != nullptr);
  return &handle_;
@@ -14,19 +14,16 @@
 #include <vector>
 #include <atomic>

+#include "rocksdb/options.h"
+#include "rocksdb/db.h"
+#include "rocksdb/env.h"
 #include "db/memtable_list.h"
 #include "db/write_batch_internal.h"
 #include "db/write_controller.h"
 #include "db/table_cache.h"
-#include "db/table_properties_collector.h"
-#include "db/flush_scheduler.h"
-#include "rocksdb/compaction_job_stats.h"
-#include "rocksdb/db.h"
-#include "rocksdb/env.h"
-#include "rocksdb/options.h"
-#include "util/instrumented_mutex.h"
-#include "util/mutable_cf_options.h"
 #include "util/thread_local.h"
+#include "db/flush_scheduler.h"
+#include "util/mutable_cf_options.h"

 namespace rocksdb {

@@ -41,8 +38,6 @@ class InternalStats;
 class ColumnFamilyData;
 class DBImpl;
 class LogBuffer;
-class InstrumentedMutex;
-class InstrumentedMutexLock;

 // ColumnFamilyHandleImpl is the class that clients use to access different
 // column families. It has non-trivial destructor, which gets called when client
@@ -50,20 +45,18 @@ class InstrumentedMutexLock;
 class ColumnFamilyHandleImpl : public ColumnFamilyHandle {
 public:
  // create while holding the mutex
-  ColumnFamilyHandleImpl(
-      ColumnFamilyData* cfd, DBImpl* db, InstrumentedMutex* mutex);
+  ColumnFamilyHandleImpl(ColumnFamilyData* cfd, DBImpl* db, port::Mutex* mutex);
  // destroy without mutex
  virtual ~ColumnFamilyHandleImpl();
  virtual ColumnFamilyData* cfd() const { return cfd_; }
  virtual const Comparator* user_comparator() const;

-  virtual uint32_t GetID() const override;
-  virtual const std::string& GetName() const override;
+  virtual uint32_t GetID() const;

 private:
  ColumnFamilyData* cfd_;
  DBImpl* db_;
-  InstrumentedMutex* mutex_;
+  port::Mutex* mutex_;
 };

 // Does not ref-count ColumnFamilyData
@@ -86,23 +79,24 @@ class ColumnFamilyHandleInternal : public ColumnFamilyHandleImpl {

 // holds references to memtable, all immutable memtables and version
 struct SuperVersion {
-  // Accessing members of this class is not thread-safe and requires external
-  // synchronization (ie db mutex held or on write thread).
  MemTable* mem;
  MemTableListVersion* imm;
  Version* current;
  MutableCFOptions mutable_cf_options;
+  std::atomic<uint32_t> refs;
+  // We need to_delete because during Cleanup(), imm->Unref() returns
+  // all memtables that we need to free through this vector. We then
+  // delete all those memtables outside of mutex, during destruction
+  autovector<MemTable*> to_delete;
  // Version number of the current SuperVersion
  uint64_t version_number;
-
-  InstrumentedMutex* db_mutex;
+  port::Mutex* db_mutex;

  // should be called outside the mutex
  SuperVersion() = default;
  ~SuperVersion();
  SuperVersion* Ref();
-  // If Unref() returns true, Cleanup() should be called with mutex held
-  // before deleting this SuperVersion.
+
  bool Unref();

  // call these two methods with db mutex held
@@ -121,31 +115,15 @@ struct SuperVersion {
  static int dummy;
  static void* const kSVInUse;
  static void* const kSVObsolete;
-
- private:
-  std::atomic<uint32_t> refs;
-  // We need to_delete because during Cleanup(), imm->Unref() returns
-  // all memtables that we need to free through this vector. We then
-  // delete all those memtables outside of mutex, during destruction
-  autovector<MemTable*> to_delete;
 };

-extern Status CheckCompressionSupported(const ColumnFamilyOptions& cf_options);
-
-extern ColumnFamilyOptions SanitizeOptions(const DBOptions& db_options,
-                                           const InternalKeyComparator* icmp,
+extern ColumnFamilyOptions SanitizeOptions(const InternalKeyComparator* icmp,
                                           const ColumnFamilyOptions& src);
-// Wrap user defined table proproties collector factories `from cf_options`
-// into internal ones in int_tbl_prop_collector_factories. Add a system internal
-// one too.
-extern void GetIntTblPropCollectorFactory(
-    const ColumnFamilyOptions& cf_options,
-    std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
-        int_tbl_prop_collector_factories);

 class ColumnFamilySet;

-// This class keeps all the data that a column family needs.
+// This class keeps all the data that a column family needs. It's mosly dumb and
+// used just to provide access to metadata.
 // Most methods require DB mutex held, unless otherwise noted
 class ColumnFamilyData {
 public:
@@ -156,37 +134,35 @@ class ColumnFamilyData {
  // thread-safe
  const std::string& GetName() const { return name_; }

-  // Ref() can only be called whily holding a DB mutex or during a
-  // single-threaded write.
-  void Ref() { refs_.fetch_add(1, std::memory_order_relaxed); }
+  void Ref() { ++refs_; }
  // will just decrease reference count to 0, but will not delete it. returns
  // true if the ref count was decreased to zero. in that case, it can be
  // deleted by the caller immediately, or later, by calling
  // FreeDeadColumnFamilies()
-  // Unref() can only be called while holding a DB mutex
  bool Unref() {
-    int old_refs = refs_.fetch_sub(1, std::memory_order_relaxed);
-    assert(old_refs > 0);
-    return old_refs == 1;
+    assert(refs_ > 0);
+    return --refs_ == 0;
  }

-  // SetDropped() can only be called under following conditions:
-  // 1) Holding a DB mutex,
-  // 2) from single-threaded write thread, AND
-  // 3) from single-threaded VersionSet::LogAndApply()
+  // This can only be called from single-threaded VersionSet::LogAndApply()
  // After dropping column family no other operation on that column family
  // will be executed. All the files and memory will be, however, kept around
  // until client drops the column family handle. That way, client can still
  // access data from dropped column family.
  // Column family can be dropped and still alive. In that state:
+  // *) Column family is not included in the iteration.
  // *) Compaction and flush is not executed on the dropped column family.
-  // *) Client can continue reading from column family. Writes will fail unless
-  // WriteOptions::ignore_missing_column_families is true
+  // *) Client can continue writing and reading from column family. However, all
+  // writes stay in the current memtable.
  // When the dropped column family is unreferenced, then we:
-  // *) Remove column family from the linked list maintained by ColumnFamilySet
  // *) delete all memory associated with that column family
  // *) delete all the files associated with that column family
-  void SetDropped();
+  void SetDropped() {
+    // can't drop default CF
+    assert(id_ != 0);
+    dropped_ = true;
+    write_controller_token_.reset();
+  }
  bool IsDropped() const { return dropped_; }

  // thread-safe
@@ -195,10 +171,8 @@ class ColumnFamilyData {
  void SetLogNumber(uint64_t log_number) { log_number_ = log_number; }
  uint64_t GetLogNumber() const { return log_number_; }

-  // !!! To be deprecated! Please don't not use this function anymore!
-  const Options* options() const { return &options_; }
-
  // thread-safe
+  const Options* options() const { return &options_; }
  const EnvOptions* soptions() const;
  const ImmutableCFOptions* ioptions() const { return &ioptions_; }
  // REQUIRES: DB mutex held
@@ -212,11 +186,9 @@ class ColumnFamilyData {
  const MutableCFOptions* GetLatestMutableCFOptions() const {
    return &mutable_cf_options_;
  }
-#ifndef ROCKSDB_LITE
  // REQUIRES: DB mutex held
  Status SetOptions(
      const std::unordered_map<std::string, std::string>& options_map);
-#endif  // ROCKSDB_LITE

  InternalStats* internal_stats() { return internal_stats_.get(); }

@@ -224,30 +196,16 @@ class ColumnFamilyData {
  MemTable* mem() { return mem_; }
  Version* current() { return current_; }
  Version* dummy_versions() { return dummy_versions_; }
-  void SetCurrent(Version* current);
-  uint64_t GetNumLiveVersions() const;  // REQUIRE: DB mutex held
  void SetMemtable(MemTable* new_mem) { mem_ = new_mem; }
-
-  // See Memtable constructor for explanation of earliest_seq param.
-  MemTable* ConstructNewMemtable(const MutableCFOptions& mutable_cf_options,
-                                 SequenceNumber earliest_seq);
-  void CreateNewMemtable(const MutableCFOptions& mutable_cf_options,
-                         SequenceNumber earliest_seq);
+  void SetCurrent(Version* current);
+  void CreateNewMemtable(const MutableCFOptions& mutable_cf_options);

  TableCache* table_cache() const { return table_cache_.get(); }

  // See documentation in compaction_picker.h
  // REQUIRES: DB mutex held
-  bool NeedsCompaction() const;
-  // REQUIRES: DB mutex held
  Compaction* PickCompaction(const MutableCFOptions& mutable_options,
                             LogBuffer* log_buffer);
-  // A flag to tell a manual compaction is to compact all levels together
-  // instad of for specific level.
-  static const int kCompactAllLevels;
-  // A flag to tell a manual compaction's output is base level.
-  static const int kCompactToBaseLevel;
-  // REQUIRES: DB mutex held
  Compaction* CompactRange(
      const MutableCFOptions& mutable_cf_options,
      int input_level, int output_level, uint32_t output_path_id,
@@ -264,19 +222,14 @@ class ColumnFamilyData {
    return internal_comparator_;
  }

-  const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
-  int_tbl_prop_collector_factories() const {
-    return &int_tbl_prop_collector_factories_;
-  }
-
  SuperVersion* GetSuperVersion() { return super_version_; }
  // thread-safe
  // Return a already referenced SuperVersion to be used safely.
-  SuperVersion* GetReferencedSuperVersion(InstrumentedMutex* db_mutex);
+  SuperVersion* GetReferencedSuperVersion(port::Mutex* db_mutex);
  // thread-safe
  // Get SuperVersion stored in thread local storage. If it does not exist,
  // get a reference from a current SuperVersion.
-  SuperVersion* GetThreadLocalSuperVersion(InstrumentedMutex* db_mutex);
+  SuperVersion* GetThreadLocalSuperVersion(port::Mutex* db_mutex);
  // Try to return SuperVersion back to thread local storage. Retrun true on
  // success and false on failure. It fails when the thread local storage
  // contains anything other than SuperVersion::kSVInUse flag.
@@ -289,26 +242,18 @@ class ColumnFamilyData {
  // if its reference count is zero and needs deletion or nullptr if not
  // As argument takes a pointer to allocated SuperVersion to enable
  // the clients to allocate SuperVersion outside of mutex.
-  // IMPORTANT: Only call this from DBImpl::InstallSuperVersion()
  SuperVersion* InstallSuperVersion(SuperVersion* new_superversion,
-                                    InstrumentedMutex* db_mutex,
+                                    port::Mutex* db_mutex,
                                    const MutableCFOptions& mutable_cf_options);
  SuperVersion* InstallSuperVersion(SuperVersion* new_superversion,
-                                    InstrumentedMutex* db_mutex);
+                                    port::Mutex* db_mutex);

  void ResetThreadLocalSuperVersions();

-  // Protected by DB mutex
-  void set_pending_flush(bool value) { pending_flush_ = value; }
-  void set_pending_compaction(bool value) { pending_compaction_ = value; }
-  bool pending_flush() { return pending_flush_; }
-  bool pending_compaction() { return pending_compaction_; }
-
 private:
  friend class ColumnFamilySet;
  ColumnFamilyData(uint32_t id, const std::string& name,
                   Version* dummy_versions, Cache* table_cache,
-                   WriteBuffer* write_buffer,
                   const ColumnFamilyOptions& options,
                   const DBOptions* db_options, const EnvOptions& env_options,
                   ColumnFamilySet* column_family_set);
@@ -326,12 +271,10 @@ class ColumnFamilyData {
  Version* dummy_versions_;  // Head of circular doubly-linked list of versions.
  Version* current_;         // == dummy_versions->prev_

-  std::atomic<int> refs_;      // outstanding references to ColumnFamilyData
+  int refs_;                   // outstanding references to ColumnFamilyData
  bool dropped_;               // true if client dropped it

  const InternalKeyComparator internal_comparator_;
-  std::vector<std::unique_ptr<IntTblPropCollectorFactory>>
-      int_tbl_prop_collector_factories_;

  const Options options_;
  const ImmutableCFOptions ioptions_;
@@ -341,8 +284,6 @@ class ColumnFamilyData {

  std::unique_ptr<InternalStats> internal_stats_;

-  WriteBuffer* write_buffer_;
-
  MemTable* mem_;
  MemTableList imm_;
  SuperVersion* super_version_;
@@ -356,9 +297,8 @@ class ColumnFamilyData {
  // This needs to be destructed before mutex_
  std::unique_ptr<ThreadLocalPtr> local_sv_;

-  // pointers for a circular linked list. we use it to support iterations over
-  // all column families that are alive (note: dropped column families can also
-  // be alive as long as client holds a reference)
+  // pointers for a circular linked list. we use it to support iterations
+  // that can be concurrent with writes
  ColumnFamilyData* next_;
  ColumnFamilyData* prev_;

@@ -374,31 +314,21 @@ class ColumnFamilyData {
  ColumnFamilySet* column_family_set_;

  std::unique_ptr<WriteControllerToken> write_controller_token_;
-
-  // If true --> this ColumnFamily is currently present in DBImpl::flush_queue_
-  bool pending_flush_;
-
-  // If true --> this ColumnFamily is currently present in
-  // DBImpl::compaction_queue_
-  bool pending_compaction_;
 };

 // ColumnFamilySet has interesting thread-safety requirements
-// * CreateColumnFamily() or RemoveColumnFamily() -- need to be protected by DB
-// mutex AND executed in the write thread.
-// CreateColumnFamily() should ONLY be called from VersionSet::LogAndApply() AND
-// single-threaded write thread. It is also called during Recovery and in
-// DumpManifest().
-// RemoveColumnFamily() is only called from SetDropped(). DB mutex needs to be
-// held and it needs to be executed from the write thread. SetDropped() also
-// guarantees that it will be called only from single-threaded LogAndApply(),
-// but this condition is not that important.
+// * CreateColumnFamily() or RemoveColumnFamily() -- need to protect by DB
+// mutex. Inside, column_family_data_ and column_families_ will be protected
+// by Lock() and Unlock(). CreateColumnFamily() should ONLY be called from
+// VersionSet::LogAndApply() in the normal runtime. It is also called
+// during Recovery and in DumpManifest(). RemoveColumnFamily() is called
+// from ColumnFamilyData destructor
 // * Iteration -- hold DB mutex, but you can release it in the body of
 // iteration. If you release DB mutex in body, reference the column
 // family before the mutex and unreference after you unlock, since the column
 // family might get dropped when the DB mutex is released
 // * GetDefault() -- thread safe
-// * GetColumnFamily() -- either inside of DB mutex or from a write thread
+// * GetColumnFamily() -- either inside of DB mutex or call Lock() <-> Unlock()
 // * GetNextColumnFamilyID(), GetMaxColumnFamily(), UpdateMaxColumnFamily(),
 // NumberOfColumnFamilies -- inside of DB mutex
 class ColumnFamilySet {
@@ -409,13 +339,10 @@ class ColumnFamilySet {
    explicit iterator(ColumnFamilyData* cfd)
        : current_(cfd) {}
    iterator& operator++() {
-      // dropped column families might still be included in this iteration
-      // (we're only removing them when client drops the last reference to the
-      // column family).
-      // dummy is never dead, so this will never be infinite
+      // dummy is never dead or dropped, so this will never be infinite
      do {
        current_ = current_->next_;
-      } while (current_->refs_.load(std::memory_order_relaxed) == 0);
+      } while (current_->refs_ == 0 || current_->IsDropped());
      return *this;
    }
    bool operator!=(const iterator& other) {
@@ -429,7 +356,7 @@ class ColumnFamilySet {

  ColumnFamilySet(const std::string& dbname, const DBOptions* db_options,
                  const EnvOptions& env_options, Cache* table_cache,
-                  WriteBuffer* write_buffer, WriteController* write_controller);
+                  WriteController* write_controller);
  ~ColumnFamilySet();

  ColumnFamilyData* GetDefault() const;
@@ -452,6 +379,9 @@ class ColumnFamilySet {
  iterator begin() { return iterator(dummy_cfd_->next_); }
  iterator end() { return iterator(dummy_cfd_); }

+  void Lock();
+  void Unlock();
+
  // REQUIRES: DB mutex held
  // Don't call while iterating over ColumnFamilySet
  void FreeDeadColumnFamilies();
@@ -463,12 +393,9 @@ class ColumnFamilySet {
  void RemoveColumnFamily(ColumnFamilyData* cfd);

  // column_families_ and column_family_data_ need to be protected:
-  // * when mutating both conditions have to be satisfied:
-  // 1. DB mutex locked
-  // 2. thread currently in single-threaded write thread
-  // * when reading, at least one condition needs to be satisfied:
-  // 1. DB mutex locked
-  // 2. accessed from a single-threaded write thread
+  // * when mutating: 1. DB mutex locked first, 2. spinlock locked second
+  // * when reading, either: 1. lock DB mutex, or 2. lock spinlock
+  //  (if both, respect the ordering to avoid deadlock!)
  std::unordered_map<std::string, uint32_t> column_families_;
  std::unordered_map<uint32_t, ColumnFamilyData*> column_family_data_;

@@ -484,8 +411,8 @@ class ColumnFamilySet {
  const DBOptions* const db_options_;
  const EnvOptions env_options_;
  Cache* table_cache_;
-  WriteBuffer* write_buffer_;
  WriteController* write_controller_;
+  std::atomic_flag spin_lock_;
 };

 // We use ColumnFamilyMemTablesImpl to provide WriteBatch a way to access
@@ -500,22 +427,21 @@ class ColumnFamilyMemTablesImpl : public ColumnFamilyMemTables {

  // sets current_ to ColumnFamilyData with column_family_id
  // returns false if column family doesn't exist
-  // REQUIRES: under a DB mutex OR from a write thread
  bool Seek(uint32_t column_family_id) override;

  // Returns log number of the selected column family
-  // REQUIRES: under a DB mutex OR from a write thread
  uint64_t GetLogNumber() const override;

  // REQUIRES: Seek() called first
-  // REQUIRES: under a DB mutex OR from a write thread
  virtual MemTable* GetMemTable() const override;

+  // Returns options for selected column family
+  // REQUIRES: Seek() called first
+  virtual const Options* GetOptions() const override;
+
  // Returns column family handle for the selected column family
-  // REQUIRES: under a DB mutex OR from a write thread
  virtual ColumnFamilyHandle* GetColumnFamilyHandle() override;

-  // REQUIRES: under a DB mutex OR from a write thread
  virtual void CheckMemtableFull() override;

 private:
@@ -12,10 +12,8 @@
 #include <string>

 #include "db/db_impl.h"
-#include "rocksdb/db.h"
 #include "rocksdb/env.h"
-#include "rocksdb/iterator.h"
-#include "util/string_util.h"
+#include "rocksdb/db.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
 #include "util/coding.h"
@@ -40,7 +38,7 @@ class EnvCounter : public EnvWrapper {
    return num_new_writable_file_;
  }
  Status NewWritableFile(const std::string& f, unique_ptr<WritableFile>* r,
-                         const EnvOptions& soptions) override {
+                         const EnvOptions& soptions) {
    ++num_new_writable_file_;
    return EnvWrapper::NewWritableFile(f, r, soptions);
  }
@@ -49,7 +47,7 @@ class EnvCounter : public EnvWrapper {
  int num_new_writable_file_;
 };

-class ColumnFamilyTest : public testing::Test {
+class ColumnFamilyTest {
 public:
  ColumnFamilyTest() : rnd_(139) {
    env_ = new EnvCounter(Env::Default());
@@ -98,12 +96,10 @@ class ColumnFamilyTest : public testing::Test {
                               &db_);
  }

-#ifndef ROCKSDB_LITE  // ReadOnlyDB is not supported
  void AssertOpenReadOnly(std::vector<std::string> cf,
                    std::vector<ColumnFamilyOptions> options = {}) {
    ASSERT_OK(OpenReadOnly(cf, options));
  }
-#endif  // !ROCKSDB_LITE


  void Open(std::vector<std::string> cf,
@@ -119,12 +115,8 @@ class ColumnFamilyTest : public testing::Test {

  int GetProperty(int cf, std::string property) {
    std::string value;
-    EXPECT_TRUE(dbfull()->GetProperty(handles_[cf], property, &value));
-#ifndef CYGWIN
+    ASSERT_TRUE(dbfull()->GetProperty(handles_[cf], property, &value));
    return std::stoi(value);
-#else
-    return std::strtol(value.c_str(), 0 /* off */, 10 /* base */);
-#endif
  }

  void Destroy() {
@@ -141,7 +133,7 @@ class ColumnFamilyTest : public testing::Test {
  void CreateColumnFamilies(
      const std::vector<std::string>& cfs,
      const std::vector<ColumnFamilyOptions> options = {}) {
-    int cfi = static_cast<int>(handles_.size());
+    int cfi = handles_.size();
    handles_.resize(cfi + cfs.size());
    names_.resize(cfi + cfs.size());
    for (size_t i = 0; i < cfs.size(); ++i) {
@@ -188,28 +180,10 @@ class ColumnFamilyTest : public testing::Test {
  }

  void WaitForFlush(int cf) {
-#ifndef ROCKSDB_LITE  // TEST functions are not supported in lite
    ASSERT_OK(dbfull()->TEST_WaitForFlushMemTable(handles_[cf]));
-#endif  // !ROCKSDB_LITE
  }

-  void WaitForCompaction() {
-#ifndef ROCKSDB_LITE  // TEST functions are not supported in lite
-    ASSERT_OK(dbfull()->TEST_WaitForCompact());
-#endif  // !ROCKSDB_LITE
-  }
-
-  uint64_t MaxTotalInMemoryState() {
-#ifndef ROCKSDB_LITE
-    return dbfull()->TEST_MaxTotalInMemoryState();
-#else
-    return 0;
-#endif  // !ROCKSDB_LITE
-  }
-
-  void AssertMaxTotalInMemoryState(uint64_t value) {
-    ASSERT_EQ(value, MaxTotalInMemoryState());
-  }
+  void WaitForCompaction() { ASSERT_OK(dbfull()->TEST_WaitForCompact()); }

  Status Put(int cf, const std::string& key, const std::string& value) {
    return db_->Put(WriteOptions(), handles_[cf], Slice(key), Slice(value));
@@ -235,21 +209,18 @@ class ColumnFamilyTest : public testing::Test {
  }

  void CompactAll(int cf) {
-    ASSERT_OK(db_->CompactRange(CompactRangeOptions(), handles_[cf], nullptr,
-                                nullptr));
+    ASSERT_OK(db_->CompactRange(handles_[cf], nullptr, nullptr));
  }

  void Compact(int cf, const Slice& start, const Slice& limit) {
-    ASSERT_OK(
-        db_->CompactRange(CompactRangeOptions(), handles_[cf], &start, &limit));
+    ASSERT_OK(db_->CompactRange(handles_[cf], &start, &limit));
  }

  int NumTableFilesAtLevel(int level, int cf) {
    return GetProperty(cf,
-                       "rocksdb.num-files-at-level" + ToString(level));
+                       "rocksdb.num-files-at-level" + std::to_string(level));
  }

-#ifndef ROCKSDB_LITE
  // Return spread of files per level
  std::string FilesPerLevel(int cf) {
    std::string result;
@@ -260,33 +231,18 @@ class ColumnFamilyTest : public testing::Test {
      snprintf(buf, sizeof(buf), "%s%d", (level ? "," : ""), f);
      result += buf;
      if (f > 0) {
-        last_non_zero_offset = static_cast<int>(result.size());
+        last_non_zero_offset = result.size();
      }
    }
    result.resize(last_non_zero_offset);
    return result;
  }
-#endif

-  void AssertFilesPerLevel(const std::string& value, int cf) {
-#ifndef ROCKSDB_LITE
-    ASSERT_EQ(value, FilesPerLevel(cf));
-#endif
-  }
-
-#ifndef ROCKSDB_LITE  // GetLiveFilesMetaData is not supported
  int CountLiveFiles() {
    std::vector<LiveFileMetaData> metadata;
    db_->GetLiveFilesMetaData(&metadata);
    return static_cast<int>(metadata.size());
  }
-#endif  // !ROCKSDB_LITE
-
-  void AssertCountLiveFiles(int expected_value) {
-#ifndef ROCKSDB_LITE
-    ASSERT_EQ(expected_value, CountLiveFiles());
-#endif
-  }

  // Do n memtable flushes, each of which produces an sstable
  // covering the range [small,large].
@@ -299,7 +255,6 @@ class ColumnFamilyTest : public testing::Test {
    }
  }

-#ifndef ROCKSDB_LITE  // GetSortedWalFiles is not supported
  int CountLiveLogFiles() {
    int micros_wait_for_log_deletion = 20000;
    env_->SleepForMicroseconds(micros_wait_for_log_deletion);
@@ -307,7 +262,7 @@ class ColumnFamilyTest : public testing::Test {
    VectorLogPtr wal_files;
    Status s;
    // GetSortedWalFiles is a flakey function -- it gets all the wal_dir
-    // children files and then later checks for their existence. if some of the
+    // children files and then later checks for their existance. if some of the
    // log files doesn't exist anymore, it reports an error. it does all of this
    // without DB mutex held, so if a background process deletes the log file
    // while the function is being executed, it returns an error. We retry the
@@ -319,32 +274,22 @@ class ColumnFamilyTest : public testing::Test {
        break;
      }
    }
-    EXPECT_OK(s);
+    ASSERT_OK(s);
    for (const auto& wal : wal_files) {
      if (wal->Type() == kAliveLogFile) {
        ++ret;
      }
    }
    return ret;
-    return 0;
-  }
-#endif  // !ROCKSDB_LITE
-
-  void AssertCountLiveLogFiles(int value) {
-#ifndef ROCKSDB_LITE  // GetSortedWalFiles is not supported
-    ASSERT_EQ(value, CountLiveLogFiles());
-#endif  // !ROCKSDB_LITE
  }

  void AssertNumberOfImmutableMemtables(std::vector<int> num_per_cf) {
    assert(num_per_cf.size() == handles_.size());

-#ifndef ROCKSDB_LITE  // GetProperty is not supported in lite
    for (size_t i = 0; i < num_per_cf.size(); ++i) {
-      ASSERT_EQ(num_per_cf[i], GetProperty(static_cast<int>(i),
-                                           "rocksdb.num-immutable-mem-table"));
+      ASSERT_EQ(num_per_cf[i],
+                GetProperty(i, "rocksdb.num-immutable-mem-table"));
    }
-#endif  // !ROCKSDB_LITE
  }

  void CopyFile(const std::string& source, const std::string& destination,
@@ -381,7 +326,7 @@ class ColumnFamilyTest : public testing::Test {
  Random rnd_;
 };

-TEST_F(ColumnFamilyTest, DontReuseColumnFamilyID) {
+TEST(ColumnFamilyTest, DontReuseColumnFamilyID) {
  for (int iter = 0; iter < 3; ++iter) {
    Open();
    CreateColumnFamilies({"one", "two", "three"});
@@ -408,7 +353,8 @@ TEST_F(ColumnFamilyTest, DontReuseColumnFamilyID) {
  }
 }

-TEST_F(ColumnFamilyTest, AddDrop) {
+
+TEST(ColumnFamilyTest, AddDrop) {
  Open();
  CreateColumnFamilies({"one", "two", "three"});
  ASSERT_EQ("NOT_FOUND", Get(1, "fodor"));
@@ -434,14 +380,14 @@ TEST_F(ColumnFamilyTest, AddDrop) {
              std::vector<std::string>({"default", "four", "three"}));
 }

-TEST_F(ColumnFamilyTest, DropTest) {
+TEST(ColumnFamilyTest, DropTest) {
  // first iteration - dont reopen DB before dropping
  // second iteration - reopen DB before dropping
  for (int iter = 0; iter < 2; ++iter) {
    Open({"default"});
    CreateColumnFamiliesAndReopen({"pikachu"});
    for (int i = 0; i < 100; ++i) {
-      ASSERT_OK(Put(1, ToString(i), "bar" + ToString(i)));
+      ASSERT_OK(Put(1, std::to_string(i), "bar" + std::to_string(i)));
    }
    ASSERT_OK(Flush(1));

@@ -450,15 +396,15 @@ TEST_F(ColumnFamilyTest, DropTest) {
    }
    ASSERT_EQ("bar1", Get(1, "1"));

-    AssertCountLiveFiles(1);
+    ASSERT_EQ(CountLiveFiles(), 1);
    DropColumnFamilies({1});
    // make sure that all files are deleted when we drop the column family
-    AssertCountLiveFiles(0);
+    ASSERT_EQ(CountLiveFiles(), 0);
    Destroy();
  }
 }

-TEST_F(ColumnFamilyTest, WriteBatchFailure) {
+TEST(ColumnFamilyTest, WriteBatchFailure) {
  Open();
  CreateColumnFamiliesAndReopen({"one", "two"});
  WriteBatch batch;
@@ -476,7 +422,7 @@ TEST_F(ColumnFamilyTest, WriteBatchFailure) {
  Close();
 }

-TEST_F(ColumnFamilyTest, ReadWrite) {
+TEST(ColumnFamilyTest, ReadWrite) {
  Open();
  CreateColumnFamiliesAndReopen({"one", "two"});
  ASSERT_OK(Put(0, "foo", "v1"));
@@ -500,7 +446,7 @@ TEST_F(ColumnFamilyTest, ReadWrite) {
  Close();
 }

-TEST_F(ColumnFamilyTest, IgnoreRecoveredLog) {
+TEST(ColumnFamilyTest, IgnoreRecoveredLog) {
  std::string backup_logs = dbname_ + "/backup_logs";

  // delete old files in backup_logs directory
@@ -575,7 +521,7 @@ TEST_F(ColumnFamilyTest, IgnoreRecoveredLog) {
  }
 }

-TEST_F(ColumnFamilyTest, FlushTest) {
+TEST(ColumnFamilyTest, FlushTest) {
  Open();
  CreateColumnFamiliesAndReopen({"one", "two"});
  ASSERT_OK(Put(0, "foo", "v1"));
@@ -583,27 +529,8 @@ TEST_F(ColumnFamilyTest, FlushTest) {
  ASSERT_OK(Put(1, "mirko", "v3"));
  ASSERT_OK(Put(0, "foo", "v2"));
  ASSERT_OK(Put(2, "fodor", "v5"));
-
-  for (int j = 0; j < 2; j++) {
-    ReadOptions ro;
-    std::vector<Iterator*> iterators;
-    // Hold super version.
-    if (j == 0) {
-      ASSERT_OK(db_->NewIterators(ro, handles_, &iterators));
-    }
-
-    for (int i = 0; i < 3; ++i) {
-      uint64_t max_total_in_memory_state =
-          MaxTotalInMemoryState();
-      Flush(i);
-      AssertMaxTotalInMemoryState(max_total_in_memory_state);
-    }
-    ASSERT_OK(Put(1, "foofoo", "bar"));
-    ASSERT_OK(Put(0, "foofoo", "bar"));
-
-    for (auto* it : iterators) {
-      delete it;
-    }
+  for (int i = 0; i < 3; ++i) {
+    Flush(i);
  }
  Reopen();

@@ -623,7 +550,7 @@ TEST_F(ColumnFamilyTest, FlushTest) {
 }

 // Makes sure that obsolete log files get deleted
-TEST_F(ColumnFamilyTest, LogDeletionTest) {
+TEST(ColumnFamilyTest, LogDeletionTest) {
  db_options_.max_total_wal_size = std::numeric_limits<uint64_t>::max();
  column_family_options_.write_buffer_size = 100000;  // 100KB
  Open();
@@ -631,7 +558,7 @@ TEST_F(ColumnFamilyTest, LogDeletionTest) {
  // Each bracket is one log file. if number is in (), it means
  // we don't need it anymore (it's been flushed)
  // []
-  AssertCountLiveLogFiles(0);
+  ASSERT_EQ(CountLiveLogFiles(), 0);
  PutRandomData(0, 1, 100);
  // [0]
  PutRandomData(1, 1, 100);
@@ -639,58 +566,58 @@ TEST_F(ColumnFamilyTest, LogDeletionTest) {
  PutRandomData(1, 1000, 100);
  WaitForFlush(1);
  // [0, (1)] [1]
-  AssertCountLiveLogFiles(2);
+  ASSERT_EQ(CountLiveLogFiles(), 2);
  PutRandomData(0, 1, 100);
  // [0, (1)] [0, 1]
-  AssertCountLiveLogFiles(2);
+  ASSERT_EQ(CountLiveLogFiles(), 2);
  PutRandomData(2, 1, 100);
  // [0, (1)] [0, 1, 2]
  PutRandomData(2, 1000, 100);
  WaitForFlush(2);
  // [0, (1)] [0, 1, (2)] [2]
-  AssertCountLiveLogFiles(3);
+  ASSERT_EQ(CountLiveLogFiles(), 3);
  PutRandomData(2, 1000, 100);
  WaitForFlush(2);
  // [0, (1)] [0, 1, (2)] [(2)] [2]
-  AssertCountLiveLogFiles(4);
+  ASSERT_EQ(CountLiveLogFiles(), 4);
  PutRandomData(3, 1, 100);
  // [0, (1)] [0, 1, (2)] [(2)] [2, 3]
  PutRandomData(1, 1, 100);
  // [0, (1)] [0, 1, (2)] [(2)] [1, 2, 3]
-  AssertCountLiveLogFiles(4);
+  ASSERT_EQ(CountLiveLogFiles(), 4);
  PutRandomData(1, 1000, 100);
  WaitForFlush(1);
  // [0, (1)] [0, (1), (2)] [(2)] [(1), 2, 3] [1]
-  AssertCountLiveLogFiles(5);
+  ASSERT_EQ(CountLiveLogFiles(), 5);
  PutRandomData(0, 1000, 100);
  WaitForFlush(0);
  // [(0), (1)] [(0), (1), (2)] [(2)] [(1), 2, 3] [1, (0)] [0]
  // delete obsolete logs -->
  // [(1), 2, 3] [1, (0)] [0]
-  AssertCountLiveLogFiles(3);
+  ASSERT_EQ(CountLiveLogFiles(), 3);
  PutRandomData(0, 1000, 100);
  WaitForFlush(0);
  // [(1), 2, 3] [1, (0)], [(0)] [0]
-  AssertCountLiveLogFiles(4);
+  ASSERT_EQ(CountLiveLogFiles(), 4);
  PutRandomData(1, 1000, 100);
  WaitForFlush(1);
  // [(1), 2, 3] [(1), (0)] [(0)] [0, (1)] [1]
-  AssertCountLiveLogFiles(5);
+  ASSERT_EQ(CountLiveLogFiles(), 5);
  PutRandomData(2, 1000, 100);
  WaitForFlush(2);
  // [(1), (2), 3] [(1), (0)] [(0)] [0, (1)] [1, (2)], [2]
-  AssertCountLiveLogFiles(6);
+  ASSERT_EQ(CountLiveLogFiles(), 6);
  PutRandomData(3, 1000, 100);
  WaitForFlush(3);
  // [(1), (2), (3)] [(1), (0)] [(0)] [0, (1)] [1, (2)], [2, (3)] [3]
  // delete obsolete logs -->
  // [0, (1)] [1, (2)], [2, (3)] [3]
-  AssertCountLiveLogFiles(4);
+  ASSERT_EQ(CountLiveLogFiles(), 4);
  Close();
 }

 // Makes sure that obsolete log files get deleted
-TEST_F(ColumnFamilyTest, DifferentWriteBufferSizes) {
+TEST(ColumnFamilyTest, DifferentWriteBufferSizes) {
  // disable flushing stale column families
  db_options_.max_total_wal_size = std::numeric_limits<uint64_t>::max();
  Open();
@@ -704,19 +631,15 @@ TEST_F(ColumnFamilyTest, DifferentWriteBufferSizes) {
  default_cf.write_buffer_size = 100000;
  default_cf.max_write_buffer_number = 10;
  default_cf.min_write_buffer_number_to_merge = 1;
-  default_cf.max_write_buffer_number_to_maintain = 0;
  one.write_buffer_size = 200000;
  one.max_write_buffer_number = 10;
  one.min_write_buffer_number_to_merge = 2;
-  one.max_write_buffer_number_to_maintain = 1;
  two.write_buffer_size = 1000000;
  two.max_write_buffer_number = 10;
  two.min_write_buffer_number_to_merge = 3;
-  two.max_write_buffer_number_to_maintain = 2;
  three.write_buffer_size = 90000;
  three.max_write_buffer_number = 10;
  three.min_write_buffer_number_to_merge = 4;
-  three.max_write_buffer_number_to_maintain = -1;

  Reopen({default_cf, one, two, three});

@@ -724,96 +647,71 @@ TEST_F(ColumnFamilyTest, DifferentWriteBufferSizes) {
  PutRandomData(0, 100, 1000);
  WaitForFlush(0);
  AssertNumberOfImmutableMemtables({0, 0, 0, 0});
-  AssertCountLiveLogFiles(1);
+  ASSERT_EQ(CountLiveLogFiles(), 1);
  PutRandomData(1, 200, 1000);
  env_->SleepForMicroseconds(micros_wait_for_flush);
  AssertNumberOfImmutableMemtables({0, 1, 0, 0});
-  AssertCountLiveLogFiles(2);
+  ASSERT_EQ(CountLiveLogFiles(), 2);
  PutRandomData(2, 1000, 1000);
  env_->SleepForMicroseconds(micros_wait_for_flush);
  AssertNumberOfImmutableMemtables({0, 1, 1, 0});
-  AssertCountLiveLogFiles(3);
+  ASSERT_EQ(CountLiveLogFiles(), 3);
  PutRandomData(2, 1000, 1000);
  env_->SleepForMicroseconds(micros_wait_for_flush);
  AssertNumberOfImmutableMemtables({0, 1, 2, 0});
-  AssertCountLiveLogFiles(4);
+  ASSERT_EQ(CountLiveLogFiles(), 4);
  PutRandomData(3, 90, 1000);
  env_->SleepForMicroseconds(micros_wait_for_flush);
  AssertNumberOfImmutableMemtables({0, 1, 2, 1});
-  AssertCountLiveLogFiles(5);
+  ASSERT_EQ(CountLiveLogFiles(), 5);
  PutRandomData(3, 90, 1000);
  env_->SleepForMicroseconds(micros_wait_for_flush);
  AssertNumberOfImmutableMemtables({0, 1, 2, 2});
-  AssertCountLiveLogFiles(6);
+  ASSERT_EQ(CountLiveLogFiles(), 6);
  PutRandomData(3, 90, 1000);
  env_->SleepForMicroseconds(micros_wait_for_flush);
  AssertNumberOfImmutableMemtables({0, 1, 2, 3});
-  AssertCountLiveLogFiles(7);
+  ASSERT_EQ(CountLiveLogFiles(), 7);
  PutRandomData(0, 100, 1000);
  WaitForFlush(0);
  AssertNumberOfImmutableMemtables({0, 1, 2, 3});
-  AssertCountLiveLogFiles(8);
+  ASSERT_EQ(CountLiveLogFiles(), 8);
  PutRandomData(2, 100, 10000);
  WaitForFlush(2);
  AssertNumberOfImmutableMemtables({0, 1, 0, 3});
-  AssertCountLiveLogFiles(9);
+  ASSERT_EQ(CountLiveLogFiles(), 9);
  PutRandomData(3, 90, 1000);
  WaitForFlush(3);
  AssertNumberOfImmutableMemtables({0, 1, 0, 0});
-  AssertCountLiveLogFiles(10);
+  ASSERT_EQ(CountLiveLogFiles(), 10);
  PutRandomData(3, 90, 1000);
  env_->SleepForMicroseconds(micros_wait_for_flush);
  AssertNumberOfImmutableMemtables({0, 1, 0, 1});
-  AssertCountLiveLogFiles(11);
+  ASSERT_EQ(CountLiveLogFiles(), 11);
  PutRandomData(1, 200, 1000);
  WaitForFlush(1);
  AssertNumberOfImmutableMemtables({0, 0, 0, 1});
-  AssertCountLiveLogFiles(5);
-  PutRandomData(3, 240, 1000);
-  WaitForFlush(3);
-  PutRandomData(3, 300, 1000);
+  ASSERT_EQ(CountLiveLogFiles(), 5);
+  PutRandomData(3, 90*6, 1000);
  WaitForFlush(3);
  AssertNumberOfImmutableMemtables({0, 0, 0, 0});
-  AssertCountLiveLogFiles(12);
+  ASSERT_EQ(CountLiveLogFiles(), 12);
  PutRandomData(0, 100, 1000);
  WaitForFlush(0);
  AssertNumberOfImmutableMemtables({0, 0, 0, 0});
-  AssertCountLiveLogFiles(12);
+  ASSERT_EQ(CountLiveLogFiles(), 12);
  PutRandomData(2, 3*100, 10000);
  WaitForFlush(2);
  AssertNumberOfImmutableMemtables({0, 0, 0, 0});
-  AssertCountLiveLogFiles(12);
+  ASSERT_EQ(CountLiveLogFiles(), 12);
  PutRandomData(1, 2*200, 1000);
  WaitForFlush(1);
  AssertNumberOfImmutableMemtables({0, 0, 0, 0});
-  AssertCountLiveLogFiles(7);
+  ASSERT_EQ(CountLiveLogFiles(), 7);
  Close();
 }

-#ifndef ROCKSDB_LITE  // Cuckoo is not supported in lite
-TEST_F(ColumnFamilyTest, MemtableNotSupportSnapshot) {
-  Open();
-  auto* s1 = dbfull()->GetSnapshot();
-  ASSERT_TRUE(s1 != nullptr);
-  dbfull()->ReleaseSnapshot(s1);
-
-  // Add a column family that doesn't support snapshot
-  ColumnFamilyOptions first;
-  first.memtable_factory.reset(NewHashCuckooRepFactory(1024 * 1024));
-  CreateColumnFamilies({"first"}, {first});
-  auto* s2 = dbfull()->GetSnapshot();
-  ASSERT_TRUE(s2 == nullptr);
-
-  // Add a column family that supports snapshot. Snapshot stays not supported.
-  ColumnFamilyOptions second;
-  CreateColumnFamilies({"second"}, {second});
-  auto* s3 = dbfull()->GetSnapshot();
-  ASSERT_TRUE(s3 == nullptr);
-  Close();
-}
-#endif  // !ROCKSDB_LITE
-
-TEST_F(ColumnFamilyTest, DifferentMergeOperators) {
+TEST(ColumnFamilyTest, DifferentMergeOperators) {
  Open();
  CreateColumnFamilies({"first", "second"});
  ColumnFamilyOptions default_cf, first, second;
@@ -843,7 +741,7 @@ TEST_F(ColumnFamilyTest, DifferentMergeOperators) {
  Close();
 }

-TEST_F(ColumnFamilyTest, DifferentCompactionStyles) {
+TEST(ColumnFamilyTest, DifferentCompactionStyles) {
  Open();
  CreateColumnFamilies({"one", "two"});
  ColumnFamilyOptions default_cf, one, two;
@@ -860,14 +758,13 @@ TEST_F(ColumnFamilyTest, DifferentCompactionStyles) {
  default_cf.table_factory.reset(NewBlockBasedTableFactory(table_options));

  one.compaction_style = kCompactionStyleUniversal;
-
-  one.num_levels = 1;
  // trigger compaction if there are >= 4 files
  one.level0_file_num_compaction_trigger = 4;
  one.write_buffer_size = 100000;

  two.compaction_style = kCompactionStyleLevel;
  two.num_levels = 4;
+  two.max_mem_compaction_level = 0;
  two.level0_file_num_compaction_trigger = 3;
  two.write_buffer_size = 100000;

@@ -877,14 +774,14 @@ TEST_F(ColumnFamilyTest, DifferentCompactionStyles) {
  for (int i = 0; i < one.level0_file_num_compaction_trigger - 1; ++i) {
    PutRandomData(1, 11, 10000);
    WaitForFlush(1);
-    AssertFilesPerLevel(ToString(i + 1), 1);
+    ASSERT_EQ(std::to_string(i + 1), FilesPerLevel(1));
  }

  // SETUP column family "two" -- level style with 4 levels
  for (int i = 0; i < two.level0_file_num_compaction_trigger - 1; ++i) {
    PutRandomData(2, 15, 10000);
    WaitForFlush(2);
-    AssertFilesPerLevel(ToString(i + 1), 2);
+    ASSERT_EQ(std::to_string(i + 1), FilesPerLevel(2));
  }

  // TRIGGER compaction "one"
@@ -897,17 +794,16 @@ TEST_F(ColumnFamilyTest, DifferentCompactionStyles) {
  WaitForCompaction();

  // VERIFY compaction "one"
-  AssertFilesPerLevel("1", 1);
+  ASSERT_EQ("1", FilesPerLevel(1));

  // VERIFY compaction "two"
-  AssertFilesPerLevel("0,1", 2);
+  ASSERT_EQ("0,1", FilesPerLevel(2));
  CompactAll(2);
-  AssertFilesPerLevel("0,1", 2);
+  ASSERT_EQ("0,1", FilesPerLevel(2));

  Close();
 }

-#ifndef ROCKSDB_LITE  // Tailing interator not supported
 namespace {
 std::string IterStatus(Iterator* iter) {
  std::string result;
@@ -920,7 +816,7 @@ std::string IterStatus(Iterator* iter) {
 }
 }  // anonymous namespace

-TEST_F(ColumnFamilyTest, NewIteratorsTest) {
+TEST(ColumnFamilyTest, NewIteratorsTest) {
  // iter == 0 -- no tailing
  // iter == 2 -- tailing
  for (int iter = 0; iter < 2; ++iter) {
@@ -964,10 +860,8 @@ TEST_F(ColumnFamilyTest, NewIteratorsTest) {
    Destroy();
  }
 }
-#endif  // !ROCKSDB_LITE

-#ifndef ROCKSDB_LITE  // ReadOnlyDB is not supported
-TEST_F(ColumnFamilyTest, ReadOnlyDBTest) {
+TEST(ColumnFamilyTest, ReadOnlyDBTest) {
  Open();
  CreateColumnFamiliesAndReopen({"one", "two", "three", "four"});
  ASSERT_OK(Put(0, "a", "b"));
@@ -1016,23 +910,22 @@ TEST_F(ColumnFamilyTest, ReadOnlyDBTest) {
  s = OpenReadOnly({"one", "four"});
  ASSERT_TRUE(!s.ok());
 }
-#endif  // !ROCKSDB_LITE

-TEST_F(ColumnFamilyTest, DontRollEmptyLogs) {
+TEST(ColumnFamilyTest, DontRollEmptyLogs) {
  Open();
  CreateColumnFamiliesAndReopen({"one", "two", "three", "four"});

  for (size_t i = 0; i < handles_.size(); ++i) {
-    PutRandomData(static_cast<int>(i), 10, 100);
+    PutRandomData(i, 10, 100);
  }
  int num_writable_file_start = env_->GetNumberOfNewWritableFileCalls();
  // this will trigger the flushes
-  for (int i = 0; i <= 4; ++i) {
+  for (size_t i = 0; i <= 4; ++i) {
    ASSERT_OK(Flush(i));
  }

  for (int i = 0; i < 4; ++i) {
-    WaitForFlush(i);
+    dbfull()->TEST_WaitForFlushMemTable(handles_[i]);
  }
  int total_new_writable_files =
      env_->GetNumberOfNewWritableFileCalls() - num_writable_file_start;
@@ -1040,7 +933,7 @@ TEST_F(ColumnFamilyTest, DontRollEmptyLogs) {
  Close();
 }

-TEST_F(ColumnFamilyTest, FlushStaleColumnFamilies) {
+TEST(ColumnFamilyTest, FlushStaleColumnFamilies) {
  Open();
  CreateColumnFamilies({"one", "two"});
  ColumnFamilyOptions default_cf, one, two;
@@ -1056,8 +949,7 @@ TEST_F(ColumnFamilyTest, FlushStaleColumnFamilies) {
  for (int i = 0; i < 2; ++i) {
    PutRandomData(0, 100, 1000);  // flush
    WaitForFlush(0);
-
-    AssertCountLiveFiles(i + 1);
+    ASSERT_EQ(i + 1, CountLiveFiles());
  }
  // third flush. now, CF [two] should be detected as stale and flushed
  // column family 1 should not be flushed since it's empty
@@ -1066,11 +958,11 @@ TEST_F(ColumnFamilyTest, FlushStaleColumnFamilies) {
  WaitForFlush(2);
  // 3 files for default column families, 1 file for column family [two], zero
  // files for column family [one], because it's empty
-  AssertCountLiveFiles(4);
+  ASSERT_EQ(4, CountLiveFiles());
  Close();
 }

-TEST_F(ColumnFamilyTest, CreateMissingColumnFamilies) {
+TEST(ColumnFamilyTest, CreateMissingColumnFamilies) {
  Status s = TryOpen({"one", "two"});
  ASSERT_TRUE(!s.ok());
  db_options_.create_missing_column_families = true;
@@ -1079,102 +971,8 @@ TEST_F(ColumnFamilyTest, CreateMissingColumnFamilies) {
  Close();
 }

-TEST_F(ColumnFamilyTest, SanitizeOptions) {
-  DBOptions db_options;
-  for (int s = kCompactionStyleLevel; s <= kCompactionStyleUniversal; ++s) {
-    for (int l = 0; l <= 2; l++) {
-      for (int i = 1; i <= 3; i++) {
-        for (int j = 1; j <= 3; j++) {
-          for (int k = 1; k <= 3; k++) {
-            ColumnFamilyOptions original;
-            original.compaction_style = static_cast<CompactionStyle>(s);
-            original.num_levels = l;
-            original.level0_stop_writes_trigger = i;
-            original.level0_slowdown_writes_trigger = j;
-            original.level0_file_num_compaction_trigger = k;
-            ColumnFamilyOptions result =
-                SanitizeOptions(db_options, nullptr, original);
-            ASSERT_TRUE(result.level0_stop_writes_trigger >=
-                        result.level0_slowdown_writes_trigger);
-            ASSERT_TRUE(result.level0_slowdown_writes_trigger >=
-                        result.level0_file_num_compaction_trigger);
-            ASSERT_TRUE(result.level0_file_num_compaction_trigger ==
-                        original.level0_file_num_compaction_trigger);
-            if (s == kCompactionStyleLevel) {
-              ASSERT_GE(result.num_levels, 2);
-            } else {
-              ASSERT_GE(result.num_levels, 1);
-              if (original.num_levels >= 1) {
-                ASSERT_EQ(result.num_levels, original.num_levels);
-              }
-            }
-          }
-        }
-      }
-    }
-  }
-}
-
-TEST_F(ColumnFamilyTest, ReadDroppedColumnFamily) {
-  // iter 0 -- drop CF, don't reopen
-  // iter 1 -- delete CF, reopen
-  for (int iter = 0; iter < 2; ++iter) {
-    db_options_.create_missing_column_families = true;
-    db_options_.max_open_files = 20;
-    // delete obsolete files always
-    db_options_.delete_obsolete_files_period_micros = 0;
-    Open({"default", "one", "two"});
-    ColumnFamilyOptions options;
-    options.level0_file_num_compaction_trigger = 100;
-    options.level0_slowdown_writes_trigger = 200;
-    options.level0_stop_writes_trigger = 200;
-    options.write_buffer_size = 100000;  // small write buffer size
-    Reopen({options, options, options});
-
-    // 1MB should create ~10 files for each CF
-    int kKeysNum = 10000;
-    PutRandomData(0, kKeysNum, 100);
-    PutRandomData(1, kKeysNum, 100);
-    PutRandomData(2, kKeysNum, 100);
-
-    if (iter == 0) {
-      // Drop CF two
-      ASSERT_OK(db_->DropColumnFamily(handles_[2]));
-    } else {
-      // delete CF two
-      delete handles_[2];
-      handles_[2] = nullptr;
-    }
-
-    // Add bunch more data to other CFs
-    PutRandomData(0, kKeysNum, 100);
-    PutRandomData(1, kKeysNum, 100);
-
-    if (iter == 1) {
-      Reopen();
-    }
-
-    // Since we didn't delete CF handle, RocksDB's contract guarantees that
-    // we're still able to read dropped CF
-    for (int i = 0; i < 3; ++i) {
-      std::unique_ptr<Iterator> iterator(
-          db_->NewIterator(ReadOptions(), handles_[i]));
-      int count = 0;
-      for (iterator->SeekToFirst(); iterator->Valid(); iterator->Next()) {
-        ASSERT_OK(iterator->status());
-        ++count;
-      }
-      ASSERT_EQ(count, kKeysNum * ((i == 2) ? 1 : 2));
-    }
-
-    Close();
-    Destroy();
-  }
-}
-
 }  // namespace rocksdb

 int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+  return rocksdb::test::RunAllTests();
 }
@@ -1,115 +0,0 @@
-//  Copyright (c) 2014, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-
-#ifndef ROCKSDB_LITE
-
-#include <mutex>
-#include <string>
-#include <vector>
-
-#include "rocksdb/db.h"
-#include "rocksdb/env.h"
-#include "util/string_util.h"
-#include "util/testharness.h"
-
-namespace rocksdb {
-
-class CompactFilesTest : public testing::Test {
- public:
-  CompactFilesTest() {
-    env_ = Env::Default();
-    db_name_ = test::TmpDir(env_) + "/compact_files_test";
-  }
-
-  std::string db_name_;
-  Env* env_;
-};
-
-// A class which remembers the name of each flushed file.
-class FlushedFileCollector : public EventListener {
- public:
-  FlushedFileCollector() {}
-  ~FlushedFileCollector() {}
-
-  virtual void OnFlushCompleted(
-      DB* db, const FlushJobInfo& info) override {
-    std::lock_guard<std::mutex> lock(mutex_);
-    flushed_files_.push_back(info.file_path);
-  }
-
-  std::vector<std::string> GetFlushedFiles() {
-    std::lock_guard<std::mutex> lock(mutex_);
-    std::vector<std::string> result;
-    for (auto fname : flushed_files_) {
-      result.push_back(fname);
-    }
-    return result;
-  }
-
- private:
-  std::vector<std::string> flushed_files_;
-  std::mutex mutex_;
-};
-
-TEST_F(CompactFilesTest, ObsoleteFiles) {
-  Options options;
-  // to trigger compaction more easily
-  const int kWriteBufferSize = 10000;
-  options.create_if_missing = true;
-  // Disable RocksDB background compaction.
-  options.compaction_style = kCompactionStyleNone;
-  // Small slowdown and stop trigger for experimental purpose.
-  options.level0_slowdown_writes_trigger = 20;
-  options.level0_stop_writes_trigger = 20;
-  options.write_buffer_size = kWriteBufferSize;
-  options.max_write_buffer_number = 2;
-  options.compression = kNoCompression;
-
-  // Add listener
-  FlushedFileCollector* collector = new FlushedFileCollector();
-  options.listeners.emplace_back(collector);
-
-  DB* db = nullptr;
-  DestroyDB(db_name_, options);
-  Status s = DB::Open(options, db_name_, &db);
-  assert(s.ok());
-  assert(db);
-
-  // create couple files
-  for (int i = 1000; i < 2000; ++i) {
-    db->Put(WriteOptions(), ToString(i),
-            std::string(kWriteBufferSize / 10, 'a' + (i % 26)));
-  }
-
-  auto l0_files = collector->GetFlushedFiles();
-  CompactionOptions compact_opt;
-  compact_opt.compression = kNoCompression;
-  compact_opt.output_file_size_limit = kWriteBufferSize * 5;
-  ASSERT_OK(db->CompactFiles(CompactionOptions(), l0_files, 1));
-
-  // verify all compaction input files are deleted
-  for (auto fname : l0_files) {
-    ASSERT_EQ(Status::NotFound(), env_->FileExists(fname));
-  }
-  delete db;
-}
-
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
-
-#else
-#include <stdio.h>
-
-int main(int argc, char** argv) {
-  fprintf(stderr,
-          "SKIPPED as DBImpl::CompactFiles is not supported in ROCKSDB_LITE\n");
-  return 0;
-}
-
-#endif  // !ROCKSDB_LITE
@@ -16,10 +16,8 @@
 #include <inttypes.h>
 #include <vector>

-#include "rocksdb/compaction_filter.h"
 #include "db/column_family.h"
 #include "util/logging.h"
-#include "util/sync_point.h"

 namespace rocksdb {

@@ -37,91 +35,51 @@ void Compaction::SetInputVersion(Version* _input_version) {

  cfd_->Ref();
  input_version_->Ref();
-  edit_.SetColumnFamily(cfd_->GetID());
+  edit_ = new VersionEdit();
+  edit_->SetColumnFamily(cfd_->GetID());
 }

-// helper function to determine if compaction is creating files at the
-// bottommost level
-bool Compaction::IsBottommostLevel(
-    int output_level, VersionStorageInfo* vstorage,
-    const std::vector<CompactionInputFiles>& inputs) {
-  if (inputs[0].level == 0 &&
-      inputs[0].files.back() != vstorage->LevelFiles(0).back()) {
-    return false;
-  }
-
-  // checks whether there are files living beyond the output_level.
-  for (int i = output_level + 1; i < vstorage->num_levels(); i++) {
-    if (vstorage->NumLevelFiles(i) > 0) {
-      return false;
-    }
-  }
-  return true;
-}
-
-bool Compaction::IsFullCompaction(
-    VersionStorageInfo* vstorage,
-    const std::vector<CompactionInputFiles>& inputs) {
-  int num_files_in_compaction = 0;
-  int total_num_files = 0;
-  for (int l = 0; l < vstorage->num_levels(); l++) {
-    total_num_files += vstorage->NumLevelFiles(l);
-  }
-  for (size_t i = 0; i < inputs.size(); i++) {
-    num_files_in_compaction += inputs[i].size();
-  }
-  return num_files_in_compaction == total_num_files;
-}
-
-Compaction::Compaction(VersionStorageInfo* vstorage,
-                       const MutableCFOptions& _mutable_cf_options,
-                       std::vector<CompactionInputFiles> _inputs,
-                       int _output_level, uint64_t _target_file_size,
-                       uint64_t _max_grandparent_overlap_bytes,
-                       uint32_t _output_path_id, CompressionType _compression,
-                       std::vector<FileMetaData*> _grandparents,
-                       bool _manual_compaction, double _score,
-                       bool _deletion_compaction)
-    : start_level_(_inputs[0].level),
-      output_level_(_output_level),
-      max_output_file_size_(_target_file_size),
-      max_grandparent_overlap_bytes_(_max_grandparent_overlap_bytes),
-      mutable_cf_options_(_mutable_cf_options),
+Compaction::Compaction(int number_levels, int start_level, int out_level,
+                       uint64_t target_file_size,
+                       uint64_t max_grandparent_overlap_bytes,
+                       uint32_t output_path_id,
+                       CompressionType output_compression, bool seek_compaction,
+                       bool deletion_compaction)
+    : start_level_(start_level),
+      output_level_(out_level),
+      max_output_file_size_(target_file_size),
+      max_grandparent_overlap_bytes_(max_grandparent_overlap_bytes),
      input_version_(nullptr),
-      number_levels_(vstorage->num_levels()),
+      edit_(nullptr),
+      number_levels_(number_levels),
      cfd_(nullptr),
-      output_path_id_(_output_path_id),
-      output_compression_(_compression),
-      deletion_compaction_(_deletion_compaction),
-      inputs_(std::move(_inputs)),
-      grandparents_(std::move(_grandparents)),
+      output_path_id_(output_path_id),
+      output_compression_(output_compression),
+      seek_compaction_(seek_compaction),
+      deletion_compaction_(deletion_compaction),
      grandparent_index_(0),
      seen_key_(false),
      overlapped_bytes_(0),
-      score_(_score),
-      bottommost_level_(IsBottommostLevel(output_level_, vstorage, inputs_)),
-      is_full_compaction_(IsFullCompaction(vstorage, inputs_)),
-      is_manual_compaction_(_manual_compaction),
-      level_ptrs_(std::vector<size_t>(number_levels_, 0)) {
-  MarkFilesBeingCompacted(true);
-
-#ifndef NDEBUG
-  for (size_t i = 1; i < inputs_.size(); ++i) {
-    assert(inputs_[i].level > inputs_[i - 1].level);
+      base_index_(-1),
+      parent_index_(-1),
+      score_(0),
+      bottommost_level_(false),
+      is_full_compaction_(false),
+      is_manual_compaction_(false),
+      level_ptrs_(std::vector<size_t>(number_levels_)) {
+  for (int i = 0; i < number_levels_; i++) {
+    level_ptrs_[i] = 0;
  }
-#endif
-
-  // setup input_levels_
-  {
-    input_levels_.resize(num_input_levels());
-    for (size_t which = 0; which < num_input_levels(); which++) {
-      DoGenerateLevelFilesBrief(&input_levels_[which], inputs_[which].files,
-                                &arena_);
-    }
+  int num_levels = output_level_ - start_level_ + 1;
+  input_levels_.resize(num_levels);
+  inputs_.resize(num_levels);
+  for (int i = 0; i < num_levels; ++i) {
+    inputs_[i].level = start_level_ + i;
  }
 }

 Compaction::~Compaction() {
+  delete edit_;
  if (input_version_ != nullptr) {
    input_version_->Unref();
  }
@@ -132,16 +90,12 @@ Compaction::~Compaction() {
  }
 }

-bool Compaction::InputCompressionMatchesOutput() const {
-  int base_level = input_version_->storage_info()->base_level();
-  bool matches = (GetCompressionType(*cfd_->ioptions(), start_level_,
-                                     base_level) == output_compression_);
-  if (matches) {
-    TEST_SYNC_POINT("Compaction::InputCompressionMatchesOutput:Matches");
-    return true;
+void Compaction::GenerateFileLevels() {
+  input_levels_.resize(num_input_levels());
+  for (int which = 0; which < num_input_levels(); which++) {
+    DoGenerateLevelFilesBrief(
+        &input_levels_[which], inputs_[which].files, &arena_);
  }
-  TEST_SYNC_POINT("Compaction::InputCompressionMatchesOutput:DidntMatch");
-  return matches;
 }

 bool Compaction::IsTrivialMove() const {
@@ -149,38 +103,16 @@ bool Compaction::IsTrivialMove() const {
  // Otherwise, the move could create a parent file that will require
  // a very expensive merge later on.
  // If start_level_== output_level_, the purpose is to force compaction
-  // filter to be applied to that level, and thus cannot be a trivial move.
-
-  // Check if start level have files with overlapping ranges
-  if (start_level_ == 0 &&
-      input_version_->storage_info()->level0_non_overlapping() == false) {
-    // We cannot move files from L0 to L1 if the files are overlapping
-    return false;
-  }
-
-  if (is_manual_compaction_ &&
-      (cfd_->ioptions()->compaction_filter != nullptr ||
-       cfd_->ioptions()->compaction_filter_factory != nullptr)) {
-    // This is a manual compaction and we have a compaction filter that should
-    // be executed, we cannot do a trivial move
-    return false;
-  }
-
-  // Used in universal compaction, where trivial move can be done if the
-  // input files are non overlapping
-  if ((cfd_->ioptions()->compaction_options_universal.allow_trivial_move) &&
-      (output_level_ != 0)) {
-    return is_trivial_move_;
-  }
-
-  return (start_level_ != output_level_ && num_input_levels() == 1 &&
-          input(0, 0)->fd.GetPathId() == output_path_id() &&
-          InputCompressionMatchesOutput() &&
+  // filter to be applied to that level, and thus cannot be a trivia move.
+  return (start_level_ != output_level_ &&
+          num_input_levels() == 2 &&
+          num_input_files(0) == 1 &&
+          num_input_files(1) == 0 &&
          TotalFileSize(grandparents_) <= max_grandparent_overlap_bytes_);
 }

 void Compaction::AddInputDeletions(VersionEdit* out_edit) {
-  for (size_t which = 0; which < num_input_levels(); which++) {
+  for (int which = 0; which < num_input_levels(); which++) {
    for (size_t i = 0; i < inputs_[which].size(); i++) {
      out_edit->DeleteFile(level(which), inputs_[which][i]->fd.GetNumber());
    }
@@ -243,7 +175,7 @@ bool Compaction::ShouldStopBefore(const Slice& internal_key) {

 // Mark (or clear) each file that is being compacted
 void Compaction::MarkFilesBeingCompacted(bool mark_as_compacted) {
-  for (size_t i = 0; i < num_input_levels(); i++) {
+  for (int i = 0; i < num_input_levels(); i++) {
    for (unsigned int j = 0; j < inputs_[i].size(); j++) {
      assert(mark_as_compacted ? !inputs_[i][j]->being_compacted :
                                  inputs_[i][j]->being_compacted);
@@ -252,45 +184,45 @@ void Compaction::MarkFilesBeingCompacted(bool mark_as_compacted) {
  }
 }

-// Sample output:
-// If compacting 3 L0 files, 2 L3 files and 1 L4 file, and outputting to L5,
-// print: "3@0 + 2@3 + 1@4 files to L5"
-const char* Compaction::InputLevelSummary(
-    InputLevelSummaryBuffer* scratch) const {
-  int len = 0;
-  bool is_first = true;
-  for (auto& input_level : inputs_) {
-    if (input_level.empty()) {
-      continue;
+// Is this compaction producing files at the bottommost level?
+void Compaction::SetupBottomMostLevel(VersionStorageInfo* vstorage,
+                                      bool is_manual, bool level0_only) {
+  if (level0_only) {
+    // If universal compaction style is used and manual
+    // compaction is occuring, then we are guaranteed that
+    // all files will be picked in a single compaction
+    // run. We can safely set bottommost_level_ = true.
+    // If it is not manual compaction, then bottommost_level_
+    // is already set when the Compaction was created.
+    if (is_manual) {
+      bottommost_level_ = true;
+    }
+    return;
+  }
+  bottommost_level_ = true;
+  // checks whether there are files living beyond the output_level.
+  for (int i = output_level_ + 1; i < number_levels_; i++) {
+    if (vstorage->NumLevelFiles(i) > 0) {
+      bottommost_level_ = false;
+      break;
    }
-    if (!is_first) {
-      len +=
-          snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len, " + ");
-    } else {
-      is_first = false;
-    }
-    len += snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len,
-                    "%" ROCKSDB_PRIszt "@%d", input_level.size(),
-                    input_level.level);
  }
-  snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len,
-           " files to L%d", output_level());
-
-  return scratch->buffer;
 }

-uint64_t Compaction::CalculateTotalInputSize() const {
-  uint64_t size = 0;
-  for (auto& input_level : inputs_) {
-    for (auto f : input_level.files) {
-      size += f->fd.GetFileSize();
-    }
+void Compaction::ReleaseInputs() {
+  if (input_version_ != nullptr) {
+    input_version_->Unref();
+    input_version_ = nullptr;
+  }
+  if (cfd_ != nullptr) {
+    if (cfd_->Unref()) {
+      delete cfd_;
+    }
+    cfd_ = nullptr;
  }
-  return size;
 }

 void Compaction::ReleaseCompactionFiles(Status status) {
-  MarkFilesBeingCompacted(false);
  cfd_->compaction_picker()->ReleaseCompactionFiles(this, status);
 }

@@ -322,14 +254,14 @@ int InputSummary(const std::vector<FileMetaData*>& files, char* output,
 void Compaction::Summary(char* output, int len) {
  int write =
      snprintf(output, len, "Base version %" PRIu64
-                            " Base level %d, inputs: [",
+                            " Base level %d, seek compaction:%d, inputs: [",
               input_version_->GetVersionNumber(),
-               start_level_);
+               start_level_, seek_compaction_);
  if (write < 0 || write >= len) {
    return;
  }

-  for (size_t level_iter = 0; level_iter < num_input_levels(); ++level_iter) {
+  for (int level_iter = 0; level_iter < num_input_levels(); ++level_iter) {
    if (level_iter > 0) {
      write += snprintf(output + write, len - write, "], [");
      if (write < 0 || write >= len) {
@@ -346,17 +278,17 @@ void Compaction::Summary(char* output, int len) {
  snprintf(output + write, len - write, "]");
 }

-uint64_t Compaction::OutputFilePreallocationSize() {
+uint64_t Compaction::OutputFilePreallocationSize(
+    const MutableCFOptions& mutable_options) {
  uint64_t preallocation_size = 0;

-  if (cfd_->ioptions()->compaction_style == kCompactionStyleLevel ||
-      output_level() > 0) {
-    preallocation_size = max_output_file_size_;
+  if (cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
+    preallocation_size = mutable_options.MaxFileSizeForLevel(output_level());
  } else {
-    // output_level() == 0
-    assert(num_input_levels() > 0);
-    for (const auto& f : inputs_[0].files) {
-      preallocation_size += f->fd.GetFileSize();
+    for (int level_iter = 0; level_iter < num_input_levels(); ++level_iter) {
+      for (const auto& f : inputs_[level_iter].files) {
+        preallocation_size += f->fd.GetFileSize();
+      }
    }
  }
  // Over-estimate slightly so we don't end up just barely crossing
@@ -364,16 +296,4 @@ uint64_t Compaction::OutputFilePreallocationSize() {
  return preallocation_size * 1.1;
 }

-std::unique_ptr<CompactionFilter> Compaction::CreateCompactionFilter() const {
-  if (!cfd_->ioptions()->compaction_filter_factory) {
-    return nullptr;
-  }
-
-  CompactionFilter::Context context;
-  context.is_full_compaction = is_full_compaction_;
-  context.is_manual_compaction = is_manual_compaction_;
-  return cfd_->ioptions()->compaction_filter_factory->CreateCompactionFilter(
-      context);
-}
-
 }  // namespace rocksdb
@@ -23,26 +23,16 @@ struct CompactionInputFiles {
  inline bool empty() const { return files.empty(); }
  inline size_t size() const { return files.size(); }
  inline void clear() { files.clear(); }
-  inline FileMetaData* operator[](size_t i) const { return files[i]; }
+  inline FileMetaData* operator[](int i) const { return files[i]; }
 };

 class Version;
 class ColumnFamilyData;
 class VersionStorageInfo;
-class CompactionFilter;

 // A Compaction encapsulates information about a compaction.
 class Compaction {
 public:
-  Compaction(VersionStorageInfo* input_version,
-             const MutableCFOptions& mutable_cf_options,
-             std::vector<CompactionInputFiles> inputs, int output_level,
-             uint64_t target_file_size, uint64_t max_grandparent_overlap_bytes,
-             uint32_t output_path_id, CompressionType compression,
-             std::vector<FileMetaData*> grandparents,
-             bool manual_compaction = false, double score = -1,
-             bool deletion_compaction = false);
-
  // No copying allowed
  Compaction(const Compaction&) = delete;
  void operator=(const Compaction&) = delete;
@@ -51,27 +41,25 @@ class Compaction {

  // Returns the level associated to the specified compaction input level.
  // If compaction_input_level is not specified, then input_level is set to 0.
-  int level(size_t compaction_input_level = 0) const {
+  int level(int compaction_input_level = 0) const {
    return inputs_[compaction_input_level].level;
  }

-  int start_level() const { return start_level_; }
-
  // Outputs will go to this level
  int output_level() const { return output_level_; }

  // Returns the number of input levels in this compaction.
-  size_t num_input_levels() const { return inputs_.size(); }
+  int num_input_levels() const { return inputs_.size(); }

  // Return the object that holds the edits to the descriptor done
  // by this compaction.
-  VersionEdit* edit() { return &edit_; }
+  VersionEdit* edit() const { return edit_; }

  // Returns the number of input files associated to the specified
  // compaction input level.
  // The function will return 0 if when "compaction_input_level" < 0
  // or "compaction_input_level" >= "num_input_levels()".
-  size_t num_input_files(size_t compaction_input_level) const {
+  int num_input_files(size_t compaction_input_level) const {
    if (compaction_input_level < inputs_.size()) {
      return inputs_[compaction_input_level].size();
    }
@@ -88,7 +76,7 @@ class Compaction {
  // specified compaction input level.
  // REQUIREMENT: "compaction_input_level" must be >= 0 and
  //              < "input_levels()"
-  FileMetaData* input(size_t compaction_input_level, size_t i) const {
+  FileMetaData* input(size_t compaction_input_level, int i) const {
    assert(compaction_input_level < inputs_.size());
    return inputs_[compaction_input_level][i];
  }
@@ -97,31 +85,37 @@ class Compaction {
  // input level.
  // REQUIREMENT: "compaction_input_level" must be >= 0 and
  //              < "input_levels()"
-  const std::vector<FileMetaData*>* inputs(size_t compaction_input_level) {
+  std::vector<FileMetaData*>* const inputs(size_t compaction_input_level) {
    assert(compaction_input_level < inputs_.size());
    return &inputs_[compaction_input_level].files;
  }

  // Returns the LevelFilesBrief of the specified compaction input level.
-  LevelFilesBrief* input_levels(size_t compaction_input_level) {
+  LevelFilesBrief* input_levels(int compaction_input_level) {
    return &input_levels_[compaction_input_level];
  }

  // Maximum size of files to build during this compaction.
-  uint64_t max_output_file_size() const { return max_output_file_size_; }
+  uint64_t MaxOutputFileSize() const { return max_output_file_size_; }

  // What compression for output
-  CompressionType output_compression() const { return output_compression_; }
+  CompressionType OutputCompressionType() const { return output_compression_; }

  // Whether need to write output file to second DB path.
-  uint32_t output_path_id() const { return output_path_id_; }
+  uint32_t GetOutputPathId() const { return output_path_id_; }
+
+  // Generate input_levels_ from inputs_
+  // Should be called when inputs_ is stable
+  void GenerateFileLevels();

  // Is this a trivial compaction that can be implemented by just
  // moving a single input file to the next level (no merging or splitting)
  bool IsTrivialMove() const;

-  // If true, then the compaction can be done by simply deleting input files.
-  bool deletion_compaction() const { return deletion_compaction_; }
+  // If true, then the comaction can be done by simply deleting input files.
+  bool IsDeletionCompaction() const {
+    return deletion_compaction_;
+  }

  // Add all inputs to this compaction as delete operations to *edit.
  void AddInputDeletions(VersionEdit* edit);
@@ -134,6 +128,10 @@ class Compaction {
  // before processing "internal_key".
  bool ShouldStopBefore(const Slice& internal_key);

+  // Release the input version for the compaction, once the compaction
+  // is successful.
+  void ReleaseInputs();
+
  // Clear all files to indicate that they are not being compacted
  // Delete this compaction from the list of running compactions.
  void ReleaseCompactionFiles(Status status);
@@ -147,26 +145,13 @@ class Compaction {
  double score() const { return score_; }

  // Is this compaction creating a file in the bottom most level?
-  bool bottommost_level() { return bottommost_level_; }
+  bool BottomMostLevel() { return bottommost_level_; }

  // Does this compaction include all sst files?
-  bool is_full_compaction() { return is_full_compaction_; }
+  bool IsFullCompaction() { return is_full_compaction_; }

  // Was this compaction triggered manually by the client?
-  bool is_manual_compaction() { return is_manual_compaction_; }
-
-  // Used when allow_trivial_move option is set in
-  // Universal compaction. If all the input files are
-  // non overlapping, then is_trivial_move_ variable
-  // will be set true, else false
-  void set_is_trivial_move(bool trivial_move) {
-    is_trivial_move_ = trivial_move;
-  }
-
-  // Used when allow_trivial_move option is set in
-  // Universal compaction. Returns true, if the input files
-  // are non-overlapping and can be trivially moved.
-  bool is_trivial_move() { return is_trivial_move_; }
+  bool IsManualCompaction() { return is_manual_compaction_; }

  // Return the MutableCFOptions that should be used throughout the compaction
  // procedure
@@ -175,47 +160,20 @@ class Compaction {
  // Returns the size in bytes that the output file should be preallocated to.
  // In level compaction, that is max_file_size_. In universal compaction, that
  // is the sum of all input file sizes.
-  uint64_t OutputFilePreallocationSize();
+  uint64_t OutputFilePreallocationSize(const MutableCFOptions& mutable_options);

  void SetInputVersion(Version* input_version);

-  struct InputLevelSummaryBuffer {
-    char buffer[128];
-  };
-
-  const char* InputLevelSummary(InputLevelSummaryBuffer* scratch) const;
-
-  uint64_t CalculateTotalInputSize() const;
-
-  // In case of compaction error, reset the nextIndex that is used
-  // to pick up the next file to be compacted from files_by_size_
-  void ResetNextCompactionIndex();
-
-  // Create a CompactionFilter from compaction_filter_factory
-  std::unique_ptr<CompactionFilter> CreateCompactionFilter() const;
-
-  // Should this compaction be broken up into smaller ones run in parallel?
-  bool IsSubCompaction() const {
-    return start_level_ == 0 && output_level_ == 1
-        && mutable_cf_options_.num_subcompactions > 1;
-  }
-
-  // If is_sub_compaction == true, how many smaller compactions should execute
-  int NumSubCompactions() const {
-    return mutable_cf_options_.num_subcompactions;
-  }
-
 private:
-  // mark (or clear) all files that are being compacted
-  void MarkFilesBeingCompacted(bool mark_as_compacted);
+  friend class CompactionPicker;
+  friend class UniversalCompactionPicker;
+  friend class FIFOCompactionPicker;
+  friend class LevelCompactionPicker;

-  // helper function to determine if compaction with inputs and storage is
-  // bottommost
-  static bool IsBottommostLevel(
-      int output_level, VersionStorageInfo* vstorage,
-      const std::vector<CompactionInputFiles>& inputs);
-  static bool IsFullCompaction(VersionStorageInfo* vstorage,
-                               const std::vector<CompactionInputFiles>& inputs);
+  Compaction(int num_levels, int start_level, int out_level,
+             uint64_t target_file_size, uint64_t max_grandparent_overlap_bytes,
+             uint32_t output_path_id, CompressionType output_compression,
+             bool seek_compaction = false, bool deletion_compaction = false);

  const int start_level_;    // the lowest level to be compacted
  const int output_level_;  // levels to which output files are stored
@@ -223,43 +181,43 @@ class Compaction {
  uint64_t max_grandparent_overlap_bytes_;
  MutableCFOptions mutable_cf_options_;
  Version* input_version_;
-  VersionEdit edit_;
-  const int number_levels_;
+  VersionEdit* edit_;
+  int number_levels_;
  ColumnFamilyData* cfd_;
  Arena arena_;          // Arena used to allocate space for file_levels_

-  const uint32_t output_path_id_;
+  uint32_t output_path_id_;
  CompressionType output_compression_;
+  bool seek_compaction_;
  // If true, then the comaction can be done by simply deleting input files.
-  const bool deletion_compaction_;
+  bool deletion_compaction_;

-  // Compaction input files organized by level. Constant after construction
-  const std::vector<CompactionInputFiles> inputs_;
+  // Compaction input files organized by level.
+  autovector<CompactionInputFiles> inputs_;

  // A copy of inputs_, organized more closely in memory
  autovector<LevelFilesBrief, 2> input_levels_;

  // State used to check for number of of overlapping grandparent files
  // (grandparent == "output_level_ + 1")
+  // This vector is updated by Version::GetOverlappingInputs().
  std::vector<FileMetaData*> grandparents_;
  size_t grandparent_index_;   // Index in grandparent_starts_
  bool seen_key_;              // Some output key has been seen
  uint64_t overlapped_bytes_;  // Bytes of overlap between current output
                               // and grandparent files
-  const double score_;         // score that was used to pick this compaction.
+  int base_index_;    // index of the file in files_[start_level_]
+  int parent_index_;  // index of some file with same range in
+                      // files_[start_level_+1]
+  double score_;      // score that was used to pick this compaction.

  // Is this compaction creating a file in the bottom most level?
-  const bool bottommost_level_;
+  bool bottommost_level_;
  // Does this compaction include all sst files?
-  const bool is_full_compaction_;
+  bool is_full_compaction_;

  // Is this compaction requested by the client?
-  const bool is_manual_compaction_;
-
-  // True if we can do trivial move in Universal multi level
-  // compaction
-
-  bool is_trivial_move_;
+  bool is_manual_compaction_;

  // "level_ptrs_" holds indices into "input_version_->levels_", where each
  // index remembers which file of an associated level we are currently used
@@ -268,8 +226,19 @@ class Compaction {
  // records indices for all levels beyond "output_level_".
  std::vector<size_t> level_ptrs_;

-  // Does input compression match the output compression?
-  bool InputCompressionMatchesOutput() const;
+  // mark (or clear) all files that are being compacted
+  void MarkFilesBeingCompacted(bool mark_as_compacted);
+
+  // Initialize whether the compaction is producing files at the
+  // bottommost level.
+  //
+  // @see BottomMostLevel()
+  void SetupBottomMostLevel(VersionStorageInfo* vstorage, bool is_manual,
+                            bool level0_only);
+
+  // In case of compaction error, reset the nextIndex that is used
+  // to pick up the next file to be compacted from files_by_size_
+  void ResetNextCompactionIndex();
 };

 // Utility function
@@ -19,6 +19,7 @@

 #include "db/dbformat.h"
 #include "db/log_writer.h"
+#include "db/snapshot.h"
 #include "db/column_family.h"
 #include "db/version_edit.h"
 #include "db/memtable_list.h"
@@ -27,10 +28,8 @@
 #include "rocksdb/env.h"
 #include "rocksdb/memtablerep.h"
 #include "rocksdb/compaction_filter.h"
-#include "rocksdb/compaction_job_stats.h"
 #include "rocksdb/transaction_log.h"
 #include "util/autovector.h"
-#include "util/event_logger.h"
 #include "util/stop_watch.h"
 #include "util/thread_local.h"
 #include "util/scoped_arena_iterator.h"
@@ -51,18 +50,20 @@ class Arena;

 class CompactionJob {
 public:
-  CompactionJob(int job_id, Compaction* compaction, const DBOptions& db_options,
+  // TODO(icanadi) make effort to reduce number of parameters here
+  // IMPORTANT: mutable_cf_options needs to be alive while CompactionJob is
+  // alive
+  CompactionJob(Compaction* compaction, const DBOptions& db_options,
+                const MutableCFOptions& mutable_cf_options,
                const EnvOptions& env_options, VersionSet* versions,
-                std::atomic<bool>* shutting_down, LogBuffer* log_buffer,
-                Directory* db_directory, Directory* output_directory,
-                Statistics* stats,
-                std::vector<SequenceNumber> existing_snapshots,
+                port::Mutex* db_mutex, std::atomic<bool>* shutting_down,
+                FileNumToPathIdMap* pending_outputs, LogBuffer* log_buffer,
+                Directory* db_directory, Statistics* stats,
+                SnapshotList* snapshot_list, bool is_snapshot_supported,
                std::shared_ptr<Cache> table_cache,
-                EventLogger* event_logger, bool paranoid_file_checks,
-                const std::string& dbname,
-                CompactionJobStats* compaction_job_stats);
+                std::function<uint64_t()> yield_callback);

-  ~CompactionJob();
+  ~CompactionJob() { assert(compact_ == nullptr); }

  // no copy/move
  CompactionJob(CompactionJob&& job) = delete;
@@ -73,57 +74,31 @@ class CompactionJob {
  void Prepare();
  // REQUIRED mutex not held
  Status Run();
-
  // REQUIRED: mutex held
  // status is the return of Run()
-  void Install(Status* status, const MutableCFOptions& mutable_cf_options,
-               InstrumentedMutex* db_mutex);
+  Status Install(Status status);

 private:
-  // REQUIRED: mutex not held
-  Status SubCompactionRun(Slice* start, Slice* end);
-
-  void GetSubCompactionBoundaries();
-  // update the thread status for starting a compaction.
-  void ReportStartedCompaction(Compaction* compaction);
  void AllocateCompactionOutputFileNumbers();
-  // Call compaction filter. Then iterate through input and compact the
-  // kv-pairs
+  // Call compaction filter if is_compaction_v2 is not true. Then iterate
+  // through input and compact the kv-pairs
  Status ProcessKeyValueCompaction(int64_t* imm_micros, Iterator* input,
-                                    Slice* start = nullptr,
-                                    Slice* end = nullptr);
-
-  Status WriteKeyValue(const Slice& key, const Slice& value,
-                       const ParsedInternalKey& ikey,
-                       const Status& input_status);
-
-  Status FinishCompactionOutputFile(const Status& input_status);
-  Status InstallCompactionResults(InstrumentedMutex* db_mutex,
-                                  const MutableCFOptions& mutable_cf_options);
+                                   bool is_compaction_v2);
+  // Call compaction_filter_v2->Filter() on kv-pairs in compact
+  void CallCompactionFilterV2(CompactionFilterV2* compaction_filter_v2);
+  Status FinishCompactionOutputFile(Iterator* input);
+  Status InstallCompactionResults();
  SequenceNumber findEarliestVisibleSnapshot(
      SequenceNumber in, const std::vector<SequenceNumber>& snapshots,
      SequenceNumber* prev_snapshot);
  void RecordCompactionIOStats();
+  void ReleaseCompactionUnusedFileNumbers();
  Status OpenCompactionOutputFile();
-  void CleanupCompaction(const Status& status);
-  void UpdateCompactionJobStats(
-    const InternalStats::CompactionStats& stats) const;
-  void RecordDroppedKeys(int64_t* key_drop_user,
-                         int64_t* key_drop_newer_entry,
-                         int64_t* key_drop_obsolete);
-
-  void UpdateCompactionStats();
-  void UpdateCompactionInputStatsHelper(
-      int* num_files, uint64_t* bytes_read, int input_level);
-
-  void LogCompaction(ColumnFamilyData* cfd, Compaction* compaction);
-
-  int job_id_;
+  void CleanupCompaction(Status status);

  // CompactionJob state
  struct CompactionState;
  CompactionState* compact_;
-  CompactionJobStats* compaction_job_stats_;

  bool bottommost_level_;
  SequenceNumber earliest_snapshot_;
@@ -133,27 +108,23 @@ class CompactionJob {
  InternalStats::CompactionStats compaction_stats_;

  // DBImpl state
-  const std::string& dbname_;
  const DBOptions& db_options_;
+  const MutableCFOptions& mutable_cf_options_;
  const EnvOptions& env_options_;
  Env* env_;
  VersionSet* versions_;
+  port::Mutex* db_mutex_;
  std::atomic<bool>* shutting_down_;
+  FileNumToPathIdMap* pending_outputs_;
  LogBuffer* log_buffer_;
  Directory* db_directory_;
-  Directory* output_directory_;
  Statistics* stats_;
-  // If there were two snapshots with seq numbers s1 and
-  // s2 and s1 < s2, and if we find two instances of a key k1 then lies
-  // entirely within s1 and s2, then the earlier version of k1 can be safely
-  // deleted because that version is not visible in any snapshot.
-  std::vector<SequenceNumber> existing_snapshots_;
+  SnapshotList* snapshots_;
+  bool is_snapshot_supported_;
  std::shared_ptr<Cache> table_cache_;

-  EventLogger* event_logger_;
-
-  bool paranoid_file_checks_;
-  std::vector<Slice> sub_compaction_boundaries_;
+  // yield callback
+  std::function<uint64_t()> yield_callback_;
 };

 }  // namespace rocksdb
@@ -1,967 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#ifndef __STDC_FORMAT_MACROS
-#define __STDC_FORMAT_MACROS
-#endif
-
-#include <inttypes.h>
-#include <algorithm>
-#include <iostream>
-#include <mutex>
-#include <queue>
-#include <set>
-#include <thread>
-#include <unordered_set>
-#include <utility>
-
-#include "db/db_impl.h"
-#include "db/dbformat.h"
-#include "db/filename.h"
-#include "db/job_context.h"
-#include "db/version_set.h"
-#include "db/write_batch_internal.h"
-#include "port/stack_trace.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/compaction_filter.h"
-#include "rocksdb/convenience.h"
-#include "rocksdb/db.h"
-#include "rocksdb/env.h"
-#include "rocksdb/experimental.h"
-#include "rocksdb/filter_policy.h"
-#include "rocksdb/options.h"
-#include "rocksdb/perf_context.h"
-#include "rocksdb/slice.h"
-#include "rocksdb/slice_transform.h"
-#include "rocksdb/table.h"
-#include "rocksdb/table_properties.h"
-#include "rocksdb/thread_status.h"
-#include "rocksdb/utilities/checkpoint.h"
-#include "rocksdb/utilities/write_batch_with_index.h"
-#include "table/block_based_table_factory.h"
-#include "table/mock_table.h"
-#include "table/plain_table_factory.h"
-#include "util/compression.h"
-#include "util/hash.h"
-#include "util/hash_linklist_rep.h"
-#include "util/logging.h"
-#include "util/mock_env.h"
-#include "util/mutexlock.h"
-#include "util/rate_limiter.h"
-#include "util/scoped_arena_iterator.h"
-#include "util/statistics.h"
-#include "util/string_util.h"
-#include "util/sync_point.h"
-#include "util/testharness.h"
-#include "util/testutil.h"
-#include "util/thread_status_util.h"
-#include "util/xfunc.h"
-#include "utilities/merge_operators.h"
-
-#if !defined(IOS_CROSS_COMPILE) && (!defined(NDEBUG) || !defined(OS_WIN))
-#ifndef ROCKSDB_LITE
-namespace rocksdb {
-
-static std::string RandomString(Random* rnd, int len, double ratio) {
-  std::string r;
-  test::CompressibleString(rnd, ratio, len, &r);
-  return r;
-}
-
-std::string Key(uint64_t key, int length) {
-  const int kBufSize = 1000;
-  char buf[kBufSize];
-  if (length > kBufSize) {
-    length = kBufSize;
-  }
-  snprintf(buf, kBufSize, "%0*" PRIu64, length, key);
-  return std::string(buf);
-}
-
-class CompactionJobStatsTest : public testing::Test,
-                               public testing::WithParamInterface<bool> {
- public:
-  std::string dbname_;
-  std::string alternative_wal_dir_;
-  Env* env_;
-  DB* db_;
-  std::vector<ColumnFamilyHandle*> handles_;
-  uint32_t num_subcompactions_;
-
-  Options last_options_;
-
-  CompactionJobStatsTest() : env_(Env::Default()) {
-    env_->SetBackgroundThreads(1, Env::LOW);
-    env_->SetBackgroundThreads(1, Env::HIGH);
-    dbname_ = test::TmpDir(env_) + "/compaction_job_stats_test";
-    alternative_wal_dir_ = dbname_ + "/wal";
-    Options options;
-    options.create_if_missing = true;
-    num_subcompactions_ = GetParam();
-    options.num_subcompactions = num_subcompactions_;
-    auto delete_options = options;
-    delete_options.wal_dir = alternative_wal_dir_;
-    EXPECT_OK(DestroyDB(dbname_, delete_options));
-    // Destroy it for not alternative WAL dir is used.
-    EXPECT_OK(DestroyDB(dbname_, options));
-    db_ = nullptr;
-    Reopen(options);
-  }
-
-  ~CompactionJobStatsTest() {
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-    rocksdb::SyncPoint::GetInstance()->LoadDependency({});
-    rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
-    Close();
-    Options options;
-    options.db_paths.emplace_back(dbname_, 0);
-    options.db_paths.emplace_back(dbname_ + "_2", 0);
-    options.db_paths.emplace_back(dbname_ + "_3", 0);
-    options.db_paths.emplace_back(dbname_ + "_4", 0);
-    EXPECT_OK(DestroyDB(dbname_, options));
-  }
-
-  // Required if inheriting from testing::WithParamInterface<>
-  static void SetUpTestCase() {}
-  static void TearDownTestCase() {}
-
-  DBImpl* dbfull() {
-    return reinterpret_cast<DBImpl*>(db_);
-  }
-
-  void CreateColumnFamilies(const std::vector<std::string>& cfs,
-                            const Options& options) {
-    ColumnFamilyOptions cf_opts(options);
-    size_t cfi = handles_.size();
-    handles_.resize(cfi + cfs.size());
-    for (auto cf : cfs) {
-      ASSERT_OK(db_->CreateColumnFamily(cf_opts, cf, &handles_[cfi++]));
-    }
-  }
-
-  void CreateAndReopenWithCF(const std::vector<std::string>& cfs,
-                             const Options& options) {
-    CreateColumnFamilies(cfs, options);
-    std::vector<std::string> cfs_plus_default = cfs;
-    cfs_plus_default.insert(cfs_plus_default.begin(), kDefaultColumnFamilyName);
-    ReopenWithColumnFamilies(cfs_plus_default, options);
-  }
-
-  void ReopenWithColumnFamilies(const std::vector<std::string>& cfs,
-                                const std::vector<Options>& options) {
-    ASSERT_OK(TryReopenWithColumnFamilies(cfs, options));
-  }
-
-  void ReopenWithColumnFamilies(const std::vector<std::string>& cfs,
-                                const Options& options) {
-    ASSERT_OK(TryReopenWithColumnFamilies(cfs, options));
-  }
-
-  Status TryReopenWithColumnFamilies(
-      const std::vector<std::string>& cfs,
-      const std::vector<Options>& options) {
-    Close();
-    EXPECT_EQ(cfs.size(), options.size());
-    std::vector<ColumnFamilyDescriptor> column_families;
-    for (size_t i = 0; i < cfs.size(); ++i) {
-      column_families.push_back(ColumnFamilyDescriptor(cfs[i], options[i]));
-    }
-    DBOptions db_opts = DBOptions(options[0]);
-    return DB::Open(db_opts, dbname_, column_families, &handles_, &db_);
-  }
-
-  Status TryReopenWithColumnFamilies(const std::vector<std::string>& cfs,
-                                     const Options& options) {
-    Close();
-    std::vector<Options> v_opts(cfs.size(), options);
-    return TryReopenWithColumnFamilies(cfs, v_opts);
-  }
-
-  void Reopen(const Options& options) {
-    ASSERT_OK(TryReopen(options));
-  }
-
-  void Close() {
-    for (auto h : handles_) {
-      delete h;
-    }
-    handles_.clear();
-    delete db_;
-    db_ = nullptr;
-  }
-
-  void DestroyAndReopen(const Options& options) {
-    // Destroy using last options
-    Destroy(last_options_);
-    ASSERT_OK(TryReopen(options));
-  }
-
-  void Destroy(const Options& options) {
-    Close();
-    ASSERT_OK(DestroyDB(dbname_, options));
-  }
-
-  Status ReadOnlyReopen(const Options& options) {
-    return DB::OpenForReadOnly(options, dbname_, &db_);
-  }
-
-  Status TryReopen(const Options& options) {
-    Close();
-    last_options_ = options;
-    return DB::Open(options, dbname_, &db_);
-  }
-
-  Status Flush(int cf = 0) {
-    if (cf == 0) {
-      return db_->Flush(FlushOptions());
-    } else {
-      return db_->Flush(FlushOptions(), handles_[cf]);
-    }
-  }
-
-  Status Put(const Slice& k, const Slice& v, WriteOptions wo = WriteOptions()) {
-    return db_->Put(wo, k, v);
-  }
-
-  Status Put(int cf, const Slice& k, const Slice& v,
-             WriteOptions wo = WriteOptions()) {
-    return db_->Put(wo, handles_[cf], k, v);
-  }
-
-  Status Delete(const std::string& k) {
-    return db_->Delete(WriteOptions(), k);
-  }
-
-  Status Delete(int cf, const std::string& k) {
-    return db_->Delete(WriteOptions(), handles_[cf], k);
-  }
-
-  std::string Get(const std::string& k, const Snapshot* snapshot = nullptr) {
-    ReadOptions options;
-    options.verify_checksums = true;
-    options.snapshot = snapshot;
-    std::string result;
-    Status s = db_->Get(options, k, &result);
-    if (s.IsNotFound()) {
-      result = "NOT_FOUND";
-    } else if (!s.ok()) {
-      result = s.ToString();
-    }
-    return result;
-  }
-
-  std::string Get(int cf, const std::string& k,
-                  const Snapshot* snapshot = nullptr) {
-    ReadOptions options;
-    options.verify_checksums = true;
-    options.snapshot = snapshot;
-    std::string result;
-    Status s = db_->Get(options, handles_[cf], k, &result);
-    if (s.IsNotFound()) {
-      result = "NOT_FOUND";
-    } else if (!s.ok()) {
-      result = s.ToString();
-    }
-    return result;
-  }
-
-  int NumTableFilesAtLevel(int level, int cf = 0) {
-    std::string property;
-    if (cf == 0) {
-      // default cfd
-      EXPECT_TRUE(db_->GetProperty(
-          "rocksdb.num-files-at-level" + NumberToString(level), &property));
-    } else {
-      EXPECT_TRUE(db_->GetProperty(
-          handles_[cf], "rocksdb.num-files-at-level" + NumberToString(level),
-          &property));
-    }
-    return atoi(property.c_str());
-  }
-
-  // Return spread of files per level
-  std::string FilesPerLevel(int cf = 0) {
-    int num_levels =
-        (cf == 0) ? db_->NumberLevels() : db_->NumberLevels(handles_[1]);
-    std::string result;
-    size_t last_non_zero_offset = 0;
-    for (int level = 0; level < num_levels; level++) {
-      int f = NumTableFilesAtLevel(level, cf);
-      char buf[100];
-      snprintf(buf, sizeof(buf), "%s%d", (level ? "," : ""), f);
-      result += buf;
-      if (f > 0) {
-        last_non_zero_offset = result.size();
-      }
-    }
-    result.resize(last_non_zero_offset);
-    return result;
-  }
-
-  uint64_t Size(const Slice& start, const Slice& limit, int cf = 0) {
-    Range r(start, limit);
-    uint64_t size;
-    if (cf == 0) {
-      db_->GetApproximateSizes(&r, 1, &size);
-    } else {
-      db_->GetApproximateSizes(handles_[1], &r, 1, &size);
-    }
-    return size;
-  }
-
-  void Compact(int cf, const Slice& start, const Slice& limit,
-               uint32_t target_path_id) {
-    CompactRangeOptions compact_options;
-    compact_options.target_path_id = target_path_id;
-    ASSERT_OK(db_->CompactRange(compact_options, handles_[cf], &start, &limit));
-  }
-
-  void Compact(int cf, const Slice& start, const Slice& limit) {
-    ASSERT_OK(
-        db_->CompactRange(CompactRangeOptions(), handles_[cf], &start, &limit));
-  }
-
-  void Compact(const Slice& start, const Slice& limit) {
-    ASSERT_OK(db_->CompactRange(CompactRangeOptions(), &start, &limit));
-  }
-
-  void TEST_Compact(int level, int cf, const Slice& start, const Slice& limit) {
-    ASSERT_OK(dbfull()->TEST_CompactRange(level, &start, &limit, handles_[cf],
-                                          true /* disallow trivial move */));
-  }
-
-  // Do n memtable compactions, each of which produces an sstable
-  // covering the range [small,large].
-  void MakeTables(int n, const std::string& small, const std::string& large,
-                  int cf = 0) {
-    for (int i = 0; i < n; i++) {
-      ASSERT_OK(Put(cf, small, "begin"));
-      ASSERT_OK(Put(cf, large, "end"));
-      ASSERT_OK(Flush(cf));
-    }
-  }
-
-  static void SetDeletionCompactionStats(
-      CompactionJobStats *stats, uint64_t input_deletions,
-      uint64_t expired_deletions, uint64_t records_replaced) {
-    stats->num_input_deletion_records = input_deletions;
-    stats->num_expired_deletion_records = expired_deletions;
-    stats->num_records_replaced = records_replaced;
-  }
-
-  void MakeTableWithKeyValues(
-    Random* rnd, uint64_t smallest, uint64_t largest,
-    int key_size, int value_size, uint64_t interval,
-    double ratio, int cf = 0) {
-    for (auto key = smallest; key < largest; key += interval) {
-      ASSERT_OK(Put(cf, Slice(Key(key, key_size)),
-                        Slice(RandomString(rnd, value_size, ratio))));
-    }
-    ASSERT_OK(Flush(cf));
-  }
-
-  // This function behaves with the implicit understanding that two
-  // rounds of keys are inserted into the database, as per the behavior
-  // of the DeletionStatsTest.
-  void SelectivelyDeleteKeys(uint64_t smallest, uint64_t largest,
-    uint64_t interval, int deletion_interval, int key_size,
-    uint64_t cutoff_key_num, CompactionJobStats* stats, int cf = 0) {
-
-    // interval needs to be >= 2 so that deletion entries can be inserted
-    // that are intended to not result in an actual key deletion by using
-    // an offset of 1 from another existing key
-    ASSERT_GE(interval, 2);
-
-    uint64_t ctr = 1;
-    uint32_t deletions_made = 0;
-    uint32_t num_deleted = 0;
-    uint32_t num_expired = 0;
-    for (auto key = smallest; key <= largest; key += interval, ctr++) {
-      if (ctr % deletion_interval == 0) {
-        ASSERT_OK(Delete(cf, Key(key, key_size)));
-        deletions_made++;
-        num_deleted++;
-
-        if (key > cutoff_key_num) {
-          num_expired++;
-        }
-      }
-    }
-
-    // Insert some deletions for keys that don't exist that
-    // are both in and out of the key range
-    ASSERT_OK(Delete(cf, Key(smallest+1, key_size)));
-    deletions_made++;
-
-    ASSERT_OK(Delete(cf, Key(smallest-1, key_size)));
-    deletions_made++;
-    num_expired++;
-
-    ASSERT_OK(Delete(cf, Key(smallest-9, key_size)));
-    deletions_made++;
-    num_expired++;
-
-    ASSERT_OK(Flush(cf));
-    SetDeletionCompactionStats(stats, deletions_made, num_expired,
-      num_deleted);
-  }
-};
-
-// An EventListener which helps verify the compaction results in
-// test CompactionJobStatsTest.
-class CompactionJobStatsChecker : public EventListener {
- public:
-  CompactionJobStatsChecker() : compression_enabled_(false) {}
-
-  size_t NumberOfUnverifiedStats() { return expected_stats_.size(); }
-
-  // Once a compaction completed, this function will verify the returned
-  // CompactionJobInfo with the oldest CompactionJobInfo added earlier
-  // in "expected_stats_" which has not yet being used for verification.
-  virtual void OnCompactionCompleted(DB *db, const CompactionJobInfo& ci) {
-    std::lock_guard<std::mutex> lock(mutex_);
-    if (expected_stats_.size()) {
-      Verify(ci.stats, expected_stats_.front());
-      expected_stats_.pop();
-    }
-  }
-
-  // A helper function which verifies whether two CompactionJobStats
-  // match.  The verification of all compaction stats are done by
-  // ASSERT_EQ except for the total input / output bytes, which we
-  // use ASSERT_GE and ASSERT_LE with a reasonable bias ---
-  // 10% in uncompressed case and 20% when compression is used.
-  virtual void Verify(const CompactionJobStats& current_stats,
-              const CompactionJobStats& stats) {
-    // time
-    ASSERT_GT(current_stats.elapsed_micros, 0U);
-
-    ASSERT_EQ(current_stats.num_input_records,
-        stats.num_input_records);
-    ASSERT_EQ(current_stats.num_input_files,
-        stats.num_input_files);
-    ASSERT_EQ(current_stats.num_input_files_at_output_level,
-        stats.num_input_files_at_output_level);
-
-    ASSERT_EQ(current_stats.num_output_records,
-        stats.num_output_records);
-    ASSERT_EQ(current_stats.num_output_files,
-        stats.num_output_files);
-
-    ASSERT_EQ(current_stats.is_manual_compaction,
-        stats.is_manual_compaction);
-
-    // file size
-    double kFileSizeBias = compression_enabled_ ? 0.20 : 0.10;
-    ASSERT_GE(current_stats.total_input_bytes * (1.00 + kFileSizeBias),
-              stats.total_input_bytes);
-    ASSERT_LE(current_stats.total_input_bytes,
-              stats.total_input_bytes * (1.00 + kFileSizeBias));
-    ASSERT_GE(current_stats.total_output_bytes * (1.00 + kFileSizeBias),
-              stats.total_output_bytes);
-    ASSERT_LE(current_stats.total_output_bytes,
-              stats.total_output_bytes * (1.00 + kFileSizeBias));
-    ASSERT_EQ(current_stats.total_input_raw_key_bytes,
-              stats.total_input_raw_key_bytes);
-    ASSERT_EQ(current_stats.total_input_raw_value_bytes,
-              stats.total_input_raw_value_bytes);
-
-    ASSERT_EQ(current_stats.num_records_replaced,
-        stats.num_records_replaced);
-
-    ASSERT_EQ(current_stats.num_corrupt_keys,
-        stats.num_corrupt_keys);
-
-    ASSERT_EQ(
-        std::string(current_stats.smallest_output_key_prefix),
-        std::string(stats.smallest_output_key_prefix));
-    ASSERT_EQ(
-        std::string(current_stats.largest_output_key_prefix),
-        std::string(stats.largest_output_key_prefix));
-  }
-
-  // Add an expected compaction stats, which will be used to
-  // verify the CompactionJobStats returned by the OnCompactionCompleted()
-  // callback.
-  void AddExpectedStats(const CompactionJobStats& stats) {
-    std::lock_guard<std::mutex> lock(mutex_);
-    expected_stats_.push(stats);
-  }
-
-  void EnableCompression(bool flag) {
-    compression_enabled_ = flag;
-  }
-
- private:
-  std::mutex mutex_;
-  std::queue<CompactionJobStats> expected_stats_;
-  bool compression_enabled_;
-};
-
-// An EventListener which helps verify the compaction statistics in
-// the test DeletionStatsTest.
-class CompactionJobDeletionStatsChecker : public CompactionJobStatsChecker {
- public:
-  // Verifies whether two CompactionJobStats match.
-  void Verify(const CompactionJobStats& current_stats,
-              const CompactionJobStats& stats) {
-    ASSERT_EQ(
-      current_stats.num_input_deletion_records,
-      stats.num_input_deletion_records);
-    ASSERT_EQ(
-        current_stats.num_expired_deletion_records,
-        stats.num_expired_deletion_records);
-    ASSERT_EQ(
-        current_stats.num_records_replaced,
-        stats.num_records_replaced);
-
-    ASSERT_EQ(current_stats.num_corrupt_keys,
-        stats.num_corrupt_keys);
-  }
-};
-
-namespace {
-
-uint64_t EstimatedFileSize(
-    uint64_t num_records, size_t key_size, size_t value_size,
-    double compression_ratio = 1.0,
-    size_t block_size = 4096,
-    int bloom_bits_per_key = 10) {
-  const size_t kPerKeyOverhead = 8;
-  const size_t kFooterSize = 512;
-
-  uint64_t data_size =
-      num_records * (key_size + value_size * compression_ratio +
-                     kPerKeyOverhead);
-
-  return data_size + kFooterSize
-         + num_records * bloom_bits_per_key / 8      // filter block
-         + data_size * (key_size + 8) / block_size;  // index block
-}
-
-namespace {
-
-void CopyPrefix(
-    const Slice& src, size_t prefix_length, std::string* dst) {
-  assert(prefix_length > 0);
-  size_t length = src.size() > prefix_length ? prefix_length : src.size();
-  dst->assign(src.data(), length);
-}
-
-}  // namespace
-
-CompactionJobStats NewManualCompactionJobStats(
-    const std::string& smallest_key, const std::string& largest_key,
-    size_t num_input_files, size_t num_input_files_at_output_level,
-    uint64_t num_input_records, size_t key_size, size_t value_size,
-    size_t num_output_files, uint64_t num_output_records,
-    double compression_ratio, uint64_t num_records_replaced,
-    bool is_manual = true) {
-  CompactionJobStats stats;
-  stats.Reset();
-
-  stats.num_input_records = num_input_records;
-  stats.num_input_files = num_input_files;
-  stats.num_input_files_at_output_level = num_input_files_at_output_level;
-
-  stats.num_output_records = num_output_records;
-  stats.num_output_files = num_output_files;
-
-  stats.total_input_bytes =
-      EstimatedFileSize(
-          num_input_records / num_input_files,
-          key_size, value_size, compression_ratio) * num_input_files;
-  stats.total_output_bytes =
-      EstimatedFileSize(
-          num_output_records / num_output_files,
-          key_size, value_size, compression_ratio) * num_output_files;
-  stats.total_input_raw_key_bytes =
-      num_input_records * (key_size + 8);
-  stats.total_input_raw_value_bytes =
-      num_input_records * value_size;
-
-  stats.is_manual_compaction = is_manual;
-
-  stats.num_records_replaced = num_records_replaced;
-
-  CopyPrefix(smallest_key,
-             CompactionJobStats::kMaxPrefixLength,
-             &stats.smallest_output_key_prefix);
-  CopyPrefix(largest_key,
-             CompactionJobStats::kMaxPrefixLength,
-             &stats.largest_output_key_prefix);
-
-  return stats;
-}
-
-CompressionType GetAnyCompression() {
-  if (Snappy_Supported()) {
-    return kSnappyCompression;
-  } else if (Zlib_Supported()) {
-    return kZlibCompression;
-  } else if (BZip2_Supported()) {
-    return kBZip2Compression;
-  } else if (LZ4_Supported()) {
-    return kLZ4Compression;
-  }
-  return kNoCompression;
-}
-
-}  // namespace
-
-TEST_P(CompactionJobStatsTest, CompactionJobStatsTest) {
-  Random rnd(301);
-  const int kBufSize = 100;
-  char buf[kBufSize];
-  uint64_t key_base = 100000000l;
-  // Note: key_base must be multiple of num_keys_per_L0_file
-  int num_keys_per_L0_file = 100;
-  const int kTestScale = 8;
-  const int kKeySize = 10;
-  const int kValueSize = 1000;
-  const double kCompressionRatio = 0.5;
-  double compression_ratio = 1.0;
-  uint64_t key_interval = key_base / num_keys_per_L0_file;
-
-  // Whenever a compaction completes, this listener will try to
-  // verify whether the returned CompactionJobStats matches
-  // what we expect.  The expected CompactionJobStats is added
-  // via AddExpectedStats().
-  auto* stats_checker = new CompactionJobStatsChecker();
-  Options options;
-  options.listeners.emplace_back(stats_checker);
-  options.create_if_missing = true;
-  options.max_background_flushes = 0;
-  // just enough setting to hold off auto-compaction.
-  options.level0_file_num_compaction_trigger = kTestScale + 1;
-  options.num_levels = 3;
-  options.compression = kNoCompression;
-  options.num_subcompactions = num_subcompactions_;
-
-  for (int test = 0; test < 2; ++test) {
-    DestroyAndReopen(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // 1st Phase: generate "num_L0_files" L0 files.
-    int num_L0_files = 0;
-    for (uint64_t start_key = key_base;
-                  start_key <= key_base * kTestScale;
-                  start_key += key_base) {
-      MakeTableWithKeyValues(
-          &rnd, start_key, start_key + key_base - 1,
-          kKeySize, kValueSize, key_interval,
-          compression_ratio, 1);
-      snprintf(buf, kBufSize, "%d", ++num_L0_files);
-      ASSERT_EQ(std::string(buf), FilesPerLevel(1));
-    }
-    ASSERT_EQ(ToString(num_L0_files), FilesPerLevel(1));
-
-    // 2nd Phase: perform L0 -> L1 compaction.
-    int L0_compaction_count = 6;
-    int count = 1;
-    std::string smallest_key;
-    std::string largest_key;
-    for (uint64_t start_key = key_base;
-         start_key <= key_base * L0_compaction_count;
-         start_key += key_base, count++) {
-      smallest_key = Key(start_key, 10);
-      largest_key = Key(start_key + key_base - key_interval, 10);
-      stats_checker->AddExpectedStats(
-          NewManualCompactionJobStats(
-              smallest_key, largest_key,
-              1, 0, num_keys_per_L0_file,
-              kKeySize, kValueSize,
-              1, num_keys_per_L0_file,
-              compression_ratio, 0));
-      ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 1U);
-      TEST_Compact(0, 1, smallest_key, largest_key);
-      snprintf(buf, kBufSize, "%d,%d", num_L0_files - count, count);
-      ASSERT_EQ(std::string(buf), FilesPerLevel(1));
-    }
-
-    // compact two files into one in the last L0 -> L1 compaction
-    int num_remaining_L0 = num_L0_files - L0_compaction_count;
-    smallest_key = Key(key_base * (L0_compaction_count + 1), 10);
-    largest_key = Key(key_base * (kTestScale + 1) - key_interval, 10);
-    stats_checker->AddExpectedStats(
-        NewManualCompactionJobStats(
-            smallest_key, largest_key,
-            num_remaining_L0,
-            0, num_keys_per_L0_file * num_remaining_L0,
-            kKeySize, kValueSize,
-            1, num_keys_per_L0_file * num_remaining_L0,
-            compression_ratio, 0));
-    ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 1U);
-    TEST_Compact(0, 1, smallest_key, largest_key);
-
-    int num_L1_files = num_L0_files - num_remaining_L0 + 1;
-    num_L0_files = 0;
-    snprintf(buf, kBufSize, "%d,%d", num_L0_files, num_L1_files);
-    ASSERT_EQ(std::string(buf), FilesPerLevel(1));
-
-    // 3rd Phase: generate sparse L0 files (wider key-range, same num of keys)
-    int sparseness = 2;
-    for (uint64_t start_key = key_base;
-                  start_key <= key_base * kTestScale;
-                  start_key += key_base * sparseness) {
-      MakeTableWithKeyValues(
-          &rnd, start_key, start_key + key_base * sparseness - 1,
-          kKeySize, kValueSize,
-          key_base * sparseness / num_keys_per_L0_file,
-          compression_ratio, 1);
-      snprintf(buf, kBufSize, "%d,%d", ++num_L0_files, num_L1_files);
-      ASSERT_EQ(std::string(buf), FilesPerLevel(1));
-    }
-
-    // 4th Phase: perform L0 -> L1 compaction again, expect higher write amp
-    // When subcompactions are enabled, the number of output files increases
-    // by 1 because multiple threads are consuming the input and generating
-    // output files without coordinating to see if the output could fit into
-    // a smaller number of files like it does when it runs sequentially
-    int num_output_files = options.num_subcompactions > 1 ? 2 : 1;
-    for (uint64_t start_key = key_base;
-         num_L0_files > 1;
-         start_key += key_base * sparseness) {
-      smallest_key = Key(start_key, 10);
-      largest_key =
-          Key(start_key + key_base * sparseness - key_interval, 10);
-      stats_checker->AddExpectedStats(
-          NewManualCompactionJobStats(
-              smallest_key, largest_key,
-              3, 2, num_keys_per_L0_file * 3,
-              kKeySize, kValueSize,
-              num_output_files,
-              num_keys_per_L0_file * 2,  // 1/3 of the data will be updated.
-              compression_ratio,
-              num_keys_per_L0_file));
-      ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 1U);
-      Compact(1, smallest_key, largest_key);
-      // TODO(aekmekji): account for whether parallel L0-L1 compaction is
-      // enabled or not. If so then num_L1_files will increase by 1
-      if (options.num_subcompactions == 1) {
-        --num_L1_files;
-      }
-      snprintf(buf, kBufSize, "%d,%d", --num_L0_files, num_L1_files);
-      ASSERT_EQ(std::string(buf), FilesPerLevel(1));
-    }
-
-    // 5th Phase: Do a full compaction, which involves in two sub-compactions.
-    // Here we expect to have 1 L0 files and 4 L1 files
-    // In the first sub-compaction, we expect L0 compaction.
-    smallest_key = Key(key_base, 10);
-    largest_key = Key(key_base * (kTestScale + 1) - key_interval, 10);
-    stats_checker->AddExpectedStats(
-        NewManualCompactionJobStats(
-            Key(key_base * (kTestScale + 1 - sparseness), 10), largest_key,
-            2, 1, num_keys_per_L0_file * 3,
-            kKeySize, kValueSize,
-            1, num_keys_per_L0_file * 2,
-            compression_ratio,
-            num_keys_per_L0_file));
-    ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 1U);
-    Compact(1, smallest_key, largest_key);
-    num_L1_files = options.num_subcompactions > 1 ? 7 : 4;
-    char L1_buf[4];
-    snprintf(L1_buf, sizeof(L1_buf), "0,%d", num_L1_files);
-    std::string L1_files(L1_buf);
-    ASSERT_EQ(L1_files, FilesPerLevel(1));
-    options.compression = GetAnyCompression();
-    if (options.compression == kNoCompression) {
-      break;
-    }
-    stats_checker->EnableCompression(true);
-    compression_ratio = kCompressionRatio;
-  }
-  ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 0U);
-}
-
-TEST_P(CompactionJobStatsTest, DeletionStatsTest) {
-  Random rnd(301);
-  uint64_t key_base = 100000l;
-  // Note: key_base must be multiple of num_keys_per_L0_file
-  int num_keys_per_L0_file = 20;
-  const int kTestScale = 8;  // make sure this is even
-  const int kKeySize = 10;
-  const int kValueSize = 100;
-  double compression_ratio = 1.0;
-  uint64_t key_interval = key_base / num_keys_per_L0_file;
-  uint64_t largest_key_num = key_base * (kTestScale + 1) - key_interval;
-  uint64_t cutoff_key_num = key_base * (kTestScale / 2 + 1) - key_interval;
-  const std::string smallest_key = Key(key_base - 10, kKeySize);
-  const std::string largest_key = Key(largest_key_num + 10, kKeySize);
-
-  // Whenever a compaction completes, this listener will try to
-  // verify whether the returned CompactionJobStats matches
-  // what we expect.
-  auto* stats_checker = new CompactionJobDeletionStatsChecker();
-  Options options;
-  options.listeners.emplace_back(stats_checker);
-  options.create_if_missing = true;
-  options.max_background_flushes = 0;
-  options.level0_file_num_compaction_trigger = kTestScale+1;
-  options.num_levels = 3;
-  options.compression = kNoCompression;
-  options.max_bytes_for_level_multiplier = 2;
-  options.num_subcompactions = num_subcompactions_;
-
-  DestroyAndReopen(options);
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  // Stage 1: Generate several L0 files and then send them to L2 by
-  // using CompactRangeOptions and CompactRange(). These files will
-  // have a strict subset of the keys from the full key-range
-  for (uint64_t start_key = key_base;
-                start_key <= key_base * kTestScale / 2;
-                start_key += key_base) {
-    MakeTableWithKeyValues(
-        &rnd, start_key, start_key + key_base - 1,
-        kKeySize, kValueSize, key_interval,
-        compression_ratio, 1);
-  }
-
-  CompactRangeOptions cr_options;
-  cr_options.change_level = true;
-  cr_options.target_level = 2;
-  db_->CompactRange(cr_options, handles_[1], nullptr, nullptr);
-  ASSERT_GT(NumTableFilesAtLevel(2, 1), 0);
-
-  // Stage 2: Generate files including keys from the entire key range
-  for (uint64_t start_key = key_base;
-                start_key <= key_base * kTestScale;
-                start_key += key_base) {
-    MakeTableWithKeyValues(
-        &rnd, start_key, start_key + key_base - 1,
-        kKeySize, kValueSize, key_interval,
-        compression_ratio, 1);
-  }
-
-  // Send these L0 files to L1
-  TEST_Compact(0, 1, smallest_key, largest_key);
-  ASSERT_GT(NumTableFilesAtLevel(1, 1), 0);
-
-  // Add a new record and flush so now there is a L0 file
-  // with a value too (not just deletions from the next step)
-  ASSERT_OK(Put(1, Key(key_base-6, kKeySize), "test"));
-  ASSERT_OK(Flush(1));
-
-  // Stage 3: Generate L0 files with some deletions so now
-  // there are files with the same key range in L0, L1, and L2
-  int deletion_interval = 3;
-  CompactionJobStats first_compaction_stats;
-  SelectivelyDeleteKeys(key_base, largest_key_num,
-      key_interval, deletion_interval, kKeySize, cutoff_key_num,
-      &first_compaction_stats, 1);
-
-  stats_checker->AddExpectedStats(first_compaction_stats);
-
-  // Stage 4: Trigger compaction and verify the stats
-  TEST_Compact(0, 1, smallest_key, largest_key);
-}
-
-namespace {
-int GetUniversalCompactionInputUnits(uint32_t num_flushes) {
-  uint32_t compaction_input_units;
-  for (compaction_input_units = 1;
-       num_flushes >= compaction_input_units;
-       compaction_input_units *= 2) {
-    if ((num_flushes & compaction_input_units) != 0) {
-      return compaction_input_units > 1 ? compaction_input_units : 0;
-    }
-  }
-  return 0;
-}
-}  // namespace
-
-TEST_P(CompactionJobStatsTest, UniversalCompactionTest) {
-  Random rnd(301);
-  uint64_t key_base = 100000000l;
-  // Note: key_base must be multiple of num_keys_per_L0_file
-  int num_keys_per_table = 100;
-  const uint32_t kTestScale = 8;
-  const int kKeySize = 10;
-  const int kValueSize = 900;
-  double compression_ratio = 1.0;
-  uint64_t key_interval = key_base / num_keys_per_table;
-
-  auto* stats_checker = new CompactionJobStatsChecker();
-  Options options;
-  options.listeners.emplace_back(stats_checker);
-  options.create_if_missing = true;
-  options.num_levels = 3;
-  options.compression = kNoCompression;
-  options.level0_file_num_compaction_trigger = 2;
-  options.target_file_size_base = num_keys_per_table * 1000;
-  options.compaction_style = kCompactionStyleUniversal;
-  options.compaction_options_universal.size_ratio = 1;
-  options.compaction_options_universal.max_size_amplification_percent = 1000;
-  options.num_subcompactions = num_subcompactions_;
-
-  DestroyAndReopen(options);
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  // Generates the expected CompactionJobStats for each compaction
-  for (uint32_t num_flushes = 2; num_flushes <= kTestScale; num_flushes++) {
-    // Here we treat one newly flushed file as an unit.
-    //
-    // For example, if a newly flushed file is 100k, and a compaction has
-    // 4 input units, then this compaction inputs 400k.
-    uint32_t num_input_units = GetUniversalCompactionInputUnits(num_flushes);
-    if (num_input_units == 0) {
-      continue;
-    }
-    // The following statement determines the expected smallest key
-    // based on whether it is a full compaction.  A full compaction only
-    // happens when the number of flushes equals to the number of compaction
-    // input runs.
-    uint64_t smallest_key =
-        (num_flushes == num_input_units) ?
-            key_base : key_base * (num_flushes - 1);
-
-    stats_checker->AddExpectedStats(
-        NewManualCompactionJobStats(
-            Key(smallest_key, 10),
-            Key(smallest_key + key_base * num_input_units - key_interval, 10),
-            num_input_units,
-            num_input_units > 2 ? num_input_units / 2 : 0,
-            num_keys_per_table * num_input_units,
-            kKeySize, kValueSize,
-            num_input_units,
-            num_keys_per_table * num_input_units,
-            1.0, 0, false));
-  }
-  ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 4U);
-
-  for (uint64_t start_key = key_base;
-                start_key <= key_base * kTestScale;
-                start_key += key_base) {
-    MakeTableWithKeyValues(
-        &rnd, start_key, start_key + key_base - 1,
-        kKeySize, kValueSize, key_interval,
-        compression_ratio, 1);
-  }
-  reinterpret_cast<DBImpl*>(db_)->TEST_WaitForCompact();
-  ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 0U);
-}
-
-INSTANTIATE_TEST_CASE_P(CompactionJobStatsTest, CompactionJobStatsTest,
-                        ::testing::Values(1, 4));
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
-
-#endif  // !ROCKSDB_LITE
-
-#else
-
-int main(int argc, char** argv) { return 0; }
-#endif  // !defined(IOS_CROSS_COMPILE)
@@ -1,260 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-
-#include <map>
-#include <string>
-
-#include "db/compaction_job.h"
-#include "db/column_family.h"
-#include "db/version_set.h"
-#include "db/writebuffer.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/options.h"
-#include "rocksdb/db.h"
-#include "util/file_reader_writer.h"
-#include "util/string_util.h"
-#include "util/testharness.h"
-#include "util/testutil.h"
-#include "table/mock_table.h"
-
-namespace rocksdb {
-
-namespace {
-void VerifyInitializationOfCompactionJobStats(
-      const CompactionJobStats& compaction_job_stats) {
-#if !defined(IOS_CROSS_COMPILE)
-  ASSERT_EQ(compaction_job_stats.elapsed_micros, 0U);
-
-  ASSERT_EQ(compaction_job_stats.num_input_records, 0U);
-  ASSERT_EQ(compaction_job_stats.num_input_files, 0U);
-  ASSERT_EQ(compaction_job_stats.num_input_files_at_output_level, 0U);
-
-  ASSERT_EQ(compaction_job_stats.num_output_records, 0U);
-  ASSERT_EQ(compaction_job_stats.num_output_files, 0U);
-
-  ASSERT_EQ(compaction_job_stats.is_manual_compaction, false);
-
-  ASSERT_EQ(compaction_job_stats.total_input_bytes, 0U);
-  ASSERT_EQ(compaction_job_stats.total_output_bytes, 0U);
-
-  ASSERT_EQ(compaction_job_stats.total_input_raw_key_bytes, 0U);
-  ASSERT_EQ(compaction_job_stats.total_input_raw_value_bytes, 0U);
-
-  ASSERT_EQ(compaction_job_stats.smallest_output_key_prefix[0], 0);
-  ASSERT_EQ(compaction_job_stats.largest_output_key_prefix[0], 0);
-
-  ASSERT_EQ(compaction_job_stats.num_records_replaced, 0U);
-
-  ASSERT_EQ(compaction_job_stats.num_input_deletion_records, 0U);
-  ASSERT_EQ(compaction_job_stats.num_expired_deletion_records, 0U);
-
-  ASSERT_EQ(compaction_job_stats.num_corrupt_keys, 0U);
-#endif  // !defined(IOS_CROSS_COMPILE)
-}
-
-}  // namespace
-
-// TODO(icanadi) Make it simpler once we mock out VersionSet
-class CompactionJobTest : public testing::Test {
- public:
-  CompactionJobTest()
-      : env_(Env::Default()),
-        dbname_(test::TmpDir() + "/compaction_job_test"),
-        mutable_cf_options_(Options(), ImmutableCFOptions(Options())),
-        table_cache_(NewLRUCache(50000, 16)),
-        write_buffer_(db_options_.db_write_buffer_size),
-        versions_(new VersionSet(dbname_, &db_options_, env_options_,
-                                 table_cache_.get(), &write_buffer_,
-                                 &write_controller_)),
-        shutting_down_(false),
-        mock_table_factory_(new mock::MockTableFactory()) {
-    EXPECT_OK(env_->CreateDirIfMissing(dbname_));
-    db_options_.db_paths.emplace_back(dbname_,
-                                      std::numeric_limits<uint64_t>::max());
-    NewDB();
-    std::vector<ColumnFamilyDescriptor> column_families;
-    cf_options_.table_factory = mock_table_factory_;
-    column_families.emplace_back(kDefaultColumnFamilyName, cf_options_);
-
-    EXPECT_OK(versions_->Recover(column_families, false));
-  }
-
-  std::string GenerateFileName(uint64_t file_number) {
-    FileMetaData meta;
-    std::vector<DbPath> db_paths;
-    db_paths.emplace_back(dbname_, std::numeric_limits<uint64_t>::max());
-    meta.fd = FileDescriptor(file_number, 0, 0);
-    return TableFileName(db_paths, meta.fd.GetNumber(), meta.fd.GetPathId());
-  }
-
-  // Corrupts key by changing the type
-  void CorruptKey(InternalKey* ikey) {
-    std::string keystr = ikey->Encode().ToString();
-    keystr[keystr.size() - 8] = kTypeLogData;
-    ikey->DecodeFrom(Slice(keystr.data(), keystr.size()));
-  }
-
-  // returns expected result after compaction
-  mock::MockFileContents CreateTwoFiles(bool gen_corrupted_keys) {
-    mock::MockFileContents expected_results;
-    const int kKeysPerFile = 10000;
-    const int kCorruptKeysPerFile = 200;
-    const int kMatchingKeys = kKeysPerFile / 2;
-    SequenceNumber sequence_number = 0;
-
-    auto corrupt_id = [&](int id) {
-      return gen_corrupted_keys && id > 0 && id <= kCorruptKeysPerFile;
-    };
-
-    for (int i = 0; i < 2; ++i) {
-      mock::MockFileContents contents;
-      SequenceNumber smallest_seqno = 0, largest_seqno = 0;
-      InternalKey smallest, largest;
-      for (int k = 0; k < kKeysPerFile; ++k) {
-        auto key = ToString(i * kMatchingKeys + k);
-        auto value = ToString(i * kKeysPerFile + k);
-        InternalKey internal_key(key, ++sequence_number, kTypeValue);
-        // This is how the key will look like once it's written in bottommost
-        // file
-        InternalKey bottommost_internal_key(key, 0, kTypeValue);
-        if (corrupt_id(k)) {
-          CorruptKey(&internal_key);
-          CorruptKey(&bottommost_internal_key);
-        }
-        if (k == 0) {
-          smallest = internal_key;
-          smallest_seqno = sequence_number;
-        } else if (k == kKeysPerFile - 1) {
-          largest = internal_key;
-          largest_seqno = sequence_number;
-        }
-        contents.insert({internal_key.Encode().ToString(), value});
-        if (i == 1 || k < kMatchingKeys || corrupt_id(k - kMatchingKeys)) {
-          expected_results.insert(
-              {bottommost_internal_key.Encode().ToString(), value});
-        }
-      }
-
-      uint64_t file_number = versions_->NewFileNumber();
-      EXPECT_OK(mock_table_factory_->CreateMockTable(
-          env_, GenerateFileName(file_number), std::move(contents)));
-
-      VersionEdit edit;
-      edit.AddFile(0, file_number, 0, 10, smallest, largest, smallest_seqno,
-                   largest_seqno, false);
-
-      mutex_.Lock();
-      versions_->LogAndApply(versions_->GetColumnFamilySet()->GetDefault(),
-                             mutable_cf_options_, &edit, &mutex_);
-      mutex_.Unlock();
-    }
-    versions_->SetLastSequence(sequence_number + 1);
-    return expected_results;
-  }
-
-  void NewDB() {
-    VersionEdit new_db;
-    new_db.SetLogNumber(0);
-    new_db.SetNextFile(2);
-    new_db.SetLastSequence(0);
-
-    const std::string manifest = DescriptorFileName(dbname_, 1);
-    unique_ptr<WritableFile> file;
-    Status s = env_->NewWritableFile(
-        manifest, &file, env_->OptimizeForManifestWrite(env_options_));
-    ASSERT_OK(s);
-    unique_ptr<WritableFileWriter> file_writer(
-        new WritableFileWriter(std::move(file), EnvOptions()));
-    {
-      log::Writer log(std::move(file_writer));
-      std::string record;
-      new_db.EncodeTo(&record);
-      s = log.AddRecord(record);
-    }
-    ASSERT_OK(s);
-    // Make "CURRENT" file that points to the new manifest file.
-    s = SetCurrentFile(env_, dbname_, 1, nullptr);
-  }
-
-  void RunCompaction(const std::vector<FileMetaData*>& files) {
-    auto cfd = versions_->GetColumnFamilySet()->GetDefault();
-
-    CompactionInputFiles compaction_input_files;
-    compaction_input_files.level = 0;
-    for (auto file : files) {
-      compaction_input_files.files.push_back(file);
-    }
-    Compaction compaction(cfd->current()->storage_info(),
-                          *cfd->GetLatestMutableCFOptions(),
-                          {compaction_input_files}, 1, 1024 * 1024, 10, 0,
-                          kNoCompression, {});
-    compaction.SetInputVersion(cfd->current());
-
-    LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL, db_options_.info_log.get());
-    mutex_.Lock();
-    EventLogger event_logger(db_options_.info_log.get());
-    CompactionJob compaction_job(
-        0, &compaction, db_options_, env_options_, versions_.get(),
-        &shutting_down_, &log_buffer, nullptr, nullptr, nullptr, {},
-        table_cache_, &event_logger, false, dbname_, &compaction_job_stats_);
-
-    VerifyInitializationOfCompactionJobStats(compaction_job_stats_);
-
-    compaction_job.Prepare();
-    mutex_.Unlock();
-    ASSERT_OK(compaction_job.Run());
-    mutex_.Lock();
-    Status s;
-    compaction_job.Install(&s, *cfd->GetLatestMutableCFOptions(), &mutex_);
-    ASSERT_OK(s);
-    mutex_.Unlock();
-
-    ASSERT_GE(compaction_job_stats_.elapsed_micros, 0U);
-    ASSERT_EQ(compaction_job_stats_.num_input_files, files.size());
-    ASSERT_EQ(compaction_job_stats_.num_output_files, 1U);
-  }
-
-  Env* env_;
-  std::string dbname_;
-  EnvOptions env_options_;
-  MutableCFOptions mutable_cf_options_;
-  std::shared_ptr<Cache> table_cache_;
-  WriteController write_controller_;
-  DBOptions db_options_;
-  ColumnFamilyOptions cf_options_;
-  WriteBuffer write_buffer_;
-  std::unique_ptr<VersionSet> versions_;
-  InstrumentedMutex mutex_;
-  std::atomic<bool> shutting_down_;
-  std::shared_ptr<mock::MockTableFactory> mock_table_factory_;
-  CompactionJobStats compaction_job_stats_;
-};
-
-TEST_F(CompactionJobTest, Simple) {
-  auto expected_results = CreateTwoFiles(false);
-  auto cfd = versions_->GetColumnFamilySet()->GetDefault();
-  auto files = cfd->current()->storage_info()->LevelFiles(0);
-  ASSERT_EQ(2U, files.size());
-
-  RunCompaction(files);
-  mock_table_factory_->AssertLatestFile(expected_results);
-}
-
-TEST_F(CompactionJobTest, SimpleCorrupted) {
-  auto expected_results = CreateTwoFiles(true);
-  auto cfd = versions_->GetColumnFamilySet()->GetDefault();
-  auto files = cfd->current()->storage_info()->LevelFiles(0);
-
-  RunCompaction(files);
-  ASSERT_EQ(compaction_job_stats_.num_corrupt_keys, 400U);
-  mock_table_factory_->AssertLatestFile(expected_results);
-}
-
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -8,11 +8,6 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.

 #pragma once
-#include <vector>
-#include <memory>
-#include <set>
-#include <unordered_set>
-
 #include "db/version_set.h"
 #include "db/compaction.h"
 #include "rocksdb/status.h"
@@ -30,7 +25,6 @@ namespace rocksdb {
 class LogBuffer;
 class Compaction;
 class VersionStorageInfo;
-struct CompactionInputFiles;

 class CompactionPicker {
 public:
@@ -64,52 +58,16 @@ class CompactionPicker {
      uint32_t output_path_id, const InternalKey* begin, const InternalKey* end,
      InternalKey** compaction_end);

-  // The maximum allowed output level.  Default value is NumberLevels() - 1.
-  virtual int MaxOutputLevel() const {
-    return NumberLevels() - 1;
-  }
-
-  virtual bool NeedsCompaction(const VersionStorageInfo* vstorage) const = 0;
-
-  // Sanitize the input set of compaction input files.
-  // When the input parameters do not describe a valid compaction, the
-  // function will try to fix the input_files by adding necessary
-  // files.  If it's not possible to conver an invalid input_files
-  // into a valid one by adding more files, the function will return a
-  // non-ok status with specific reason.
-#ifndef ROCKSDB_LITE
-  Status SanitizeCompactionInputFiles(
-      std::unordered_set<uint64_t>* input_files,
-      const ColumnFamilyMetaData& cf_meta,
-      const int output_level) const;
-#endif  // ROCKSDB_LITE
+  // Given the current number of levels, returns the lowest allowed level
+  // for compaction input.
+  virtual int MaxInputLevel(int current_num_levels) const = 0;

  // Free up the files that participated in a compaction
  void ReleaseCompactionFiles(Compaction* c, Status status);

-  // Returns true if any one of the specified files are being compacted
-  bool FilesInCompaction(const std::vector<FileMetaData*>& files);
-
-  // Takes a list of CompactionInputFiles and returns a Compaction object.
-  Compaction* FormCompaction(
-      const CompactionOptions& compact_options,
-      const std::vector<CompactionInputFiles>& input_files, int output_level,
-      VersionStorageInfo* vstorage, const MutableCFOptions& mutable_cf_options,
-      uint32_t output_path_id) const;
-
-  // Converts a set of compaction input file numbers into
-  // a list of CompactionInputFiles.
-  Status GetCompactionInputsFromFileNumbers(
-      std::vector<CompactionInputFiles>* input_files,
-      std::unordered_set<uint64_t>* input_set,
-      const VersionStorageInfo* vstorage,
-      const CompactionOptions& compact_options) const;
-
-  // Used in universal compaction when the enabled_trivial_move
-  // option is set. Checks whether there are any overlapping files
-  // in the input. Returns true if the input files are non
-  // overlapping.
-  bool IsInputNonOverlapping(Compaction* c);
+  // Return the total amount of data that is undergoing
+  // compactions per level
+  void SizeBeingCompacted(std::vector<uint64_t>& sizes);

 protected:
  int NumberLevels() const { return ioptions_.num_levels; }
@@ -117,14 +75,14 @@ class CompactionPicker {
  // Stores the minimal range that covers all entries in inputs in
  // *smallest, *largest.
  // REQUIRES: inputs is not empty
-  void GetRange(const CompactionInputFiles& inputs,
-                InternalKey* smallest, InternalKey* largest);
+  void GetRange(const std::vector<FileMetaData*>& inputs, InternalKey* smallest,
+                InternalKey* largest);

  // Stores the minimal range that covers all entries in inputs1 and inputs2
  // in *smallest, *largest.
  // REQUIRES: inputs is not empty
-  void GetRange(const CompactionInputFiles& inputs1,
-                const CompactionInputFiles& inputs2,
+  void GetRange(const std::vector<FileMetaData*>& inputs1,
+                const std::vector<FileMetaData*>& inputs2,
                InternalKey* smallest, InternalKey* largest);

  // Add more files to the inputs on "level" to make sure that
@@ -138,44 +96,64 @@ class CompactionPicker {
  //
  // Will return false if it is impossible to apply this compaction.
  bool ExpandWhileOverlapping(const std::string& cf_name,
-                              VersionStorageInfo* vstorage,
-                              CompactionInputFiles* inputs);
+                              VersionStorageInfo* vstorage, Compaction* c);
+
+  // Returns true if any one of the specified files are being compacted
+  bool FilesInCompaction(std::vector<FileMetaData*>& files);

  // Returns true if any one of the parent files are being compacted
-  bool RangeInCompaction(VersionStorageInfo* vstorage,
-                         const InternalKey* smallest,
-                         const InternalKey* largest, int level, int* index);
+  bool ParentRangeInCompaction(VersionStorageInfo* vstorage,
+                               const InternalKey* smallest,
+                               const InternalKey* largest, int level,
+                               int* index);

-  bool SetupOtherInputs(const std::string& cf_name,
+  void SetupOtherInputs(const std::string& cf_name,
                        const MutableCFOptions& mutable_cf_options,
-                        VersionStorageInfo* vstorage,
-                        CompactionInputFiles* inputs,
-                        CompactionInputFiles* output_level_inputs,
-                        int* parent_index, int base_index);
-
-  void GetGrandparents(VersionStorageInfo* vstorage,
-                       const CompactionInputFiles& inputs,
-                       const CompactionInputFiles& output_level_inputs,
-                       std::vector<FileMetaData*>* grandparents);
+                        VersionStorageInfo* vstorage, Compaction* c);

  const ImmutableCFOptions& ioptions_;

-  // A helper function to SanitizeCompactionInputFiles() that
-  // sanitizes "input_files" by adding necessary files.
-#ifndef ROCKSDB_LITE
-  virtual Status SanitizeCompactionInputFilesForAllLevels(
-      std::unordered_set<uint64_t>* input_files,
-      const ColumnFamilyMetaData& cf_meta,
-      const int output_level) const;
-#endif  // ROCKSDB_LITE
+  // record all the ongoing compactions for all levels
+  std::vector<std::set<Compaction*>> compactions_in_progress_;

-  // Keeps track of all compactions that are running on Level0.
-  // It is protected by DB mutex
-  std::set<Compaction*> level0_compactions_in_progress_;

+ private:
  const InternalKeyComparator* const icmp_;
 };

+class UniversalCompactionPicker : public CompactionPicker {
+ public:
+  UniversalCompactionPicker(const ImmutableCFOptions& ioptions,
+                            const InternalKeyComparator* icmp)
+      : CompactionPicker(ioptions, icmp) {}
+  virtual Compaction* PickCompaction(const std::string& cf_name,
+                                     const MutableCFOptions& mutable_cf_options,
+                                     VersionStorageInfo* vstorage,
+                                     LogBuffer* log_buffer) override;
+
+  // The maxinum allowed input level.  Always return 0.
+  virtual int MaxInputLevel(int current_num_levels) const override {
+    return 0;
+  }
+
+ private:
+  // Pick Universal compaction to limit read amplification
+  Compaction* PickCompactionUniversalReadAmp(
+      const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
+      VersionStorageInfo* vstorage, double score, unsigned int ratio,
+      unsigned int num_files, LogBuffer* log_buffer);
+
+  // Pick Universal compaction to limit space amplification.
+  Compaction* PickCompactionUniversalSizeAmp(
+      const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
+      VersionStorageInfo* vstorage, double score, LogBuffer* log_buffer);
+
+  // Pick a path ID to place a newly generated file, with its estimated file
+  // size.
+  static uint32_t GetPathId(const ImmutableCFOptions& ioptions,
+                            uint64_t file_size);
+};
+
 class LevelCompactionPicker : public CompactionPicker {
 public:
  LevelCompactionPicker(const ImmutableCFOptions& ioptions,
@@ -186,101 +164,20 @@ class LevelCompactionPicker : public CompactionPicker {
                                     VersionStorageInfo* vstorage,
                                     LogBuffer* log_buffer) override;

-  virtual bool NeedsCompaction(const VersionStorageInfo* vstorage) const
-      override;
-
-  // Pick a path ID to place a newly generated file, with its level
-  static uint32_t GetPathId(const ImmutableCFOptions& ioptions,
-                            const MutableCFOptions& mutable_cf_options,
-                            int level);
+  // Returns current_num_levels - 2, meaning the last level cannot be
+  // compaction input level.
+  virtual int MaxInputLevel(int current_num_levels) const override {
+    return current_num_levels - 2;
+  }

 private:
-  // For the specfied level, pick a file that we want to compact.
-  // Returns false if there is no file to compact.
-  // If it returns true, inputs->files.size() will be exactly one.
+  // For the specfied level, pick a compaction.
+  // Returns nullptr if there is no compaction to be done.
  // If level is 0 and there is already a compaction on that level, this
-  // function will return false.
-  bool PickCompactionBySize(VersionStorageInfo* vstorage, int level,
-                            int output_level, CompactionInputFiles* inputs,
-                            int* parent_index, int* base_index);
-
-  // If there is any file marked for compaction, put put it into inputs.
-  // This is still experimental. It will return meaningful results only if
-  // clients call experimental feature SuggestCompactRange()
-  void PickFilesMarkedForCompactionExperimental(const std::string& cf_name,
-                                                VersionStorageInfo* vstorage,
-                                                CompactionInputFiles* inputs,
-                                                int* level, int* output_level);
-};
-
-#ifndef ROCKSDB_LITE
-class UniversalCompactionPicker : public CompactionPicker {
- public:
-  UniversalCompactionPicker(const ImmutableCFOptions& ioptions,
-                            const InternalKeyComparator* icmp)
-      : CompactionPicker(ioptions, icmp) {}
-  virtual Compaction* PickCompaction(const std::string& cf_name,
-                                     const MutableCFOptions& mutable_cf_options,
-                                     VersionStorageInfo* vstorage,
-                                     LogBuffer* log_buffer) override;
-
-  virtual int MaxOutputLevel() const override { return NumberLevels() - 1; }
-
-  virtual bool NeedsCompaction(const VersionStorageInfo* vstorage) const
-      override;
-
- private:
-  struct SortedRun {
-    SortedRun(int _level, FileMetaData* _file, uint64_t _size,
-              uint64_t _compensated_file_size, bool _being_compacted)
-        : level(_level),
-          file(_file),
-          size(_size),
-          compensated_file_size(_compensated_file_size),
-          being_compacted(_being_compacted) {
-      assert(compensated_file_size > 0);
-      assert(level != 0 || file != nullptr);
-    }
-
-    void Dump(char* out_buf, size_t out_buf_size,
-              bool print_path = false) const;
-
-    // sorted_run_count is added into the string to print
-    void DumpSizeInfo(char* out_buf, size_t out_buf_size,
-                      int sorted_run_count) const;
-
-    int level;
-    // `file` Will be null for level > 0. For level = 0, the sorted run is
-    // for this file.
-    FileMetaData* file;
-    // For level > 0, `size` and `compensated_file_size` are sum of sizes all
-    // files in the level. `being_compacted` should be the same for all files
-    // in a non-zero level. Use the value here.
-    uint64_t size;
-    uint64_t compensated_file_size;
-    bool being_compacted;
-  };
-
-  // Pick Universal compaction to limit read amplification
-  Compaction* PickCompactionUniversalReadAmp(
-      const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
-      VersionStorageInfo* vstorage, double score, unsigned int ratio,
-      unsigned int num_files, const std::vector<SortedRun>& sorted_runs,
-      LogBuffer* log_buffer);
-
-  // Pick Universal compaction to limit space amplification.
-  Compaction* PickCompactionUniversalSizeAmp(
-      const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
-      VersionStorageInfo* vstorage, double score,
-      const std::vector<SortedRun>& sorted_runs, LogBuffer* log_buffer);
-
-  static std::vector<SortedRun> CalculateSortedRuns(
-      const VersionStorageInfo& vstorage, const ImmutableCFOptions& ioptions);
-
-  // Pick a path ID to place a newly generated file, with its estimated file
-  // size.
-  static uint32_t GetPathId(const ImmutableCFOptions& ioptions,
-                            uint64_t file_size);
+  // function will return nullptr.
+  Compaction* PickCompactionBySize(const MutableCFOptions& mutable_cf_options,
+                                   VersionStorageInfo* vstorage, int level,
+                                   double score);
 };

 class FIFOCompactionPicker : public CompactionPicker {
@@ -300,49 +197,13 @@ class FIFOCompactionPicker : public CompactionPicker {
      uint32_t output_path_id, const InternalKey* begin, const InternalKey* end,
      InternalKey** compaction_end) override;

-  // The maximum allowed output level.  Always returns 0.
-  virtual int MaxOutputLevel() const override {
+  // The maxinum allowed input level.  Always return 0.
+  virtual int MaxInputLevel(int current_num_levels) const override {
    return 0;
  }
-
-  virtual bool NeedsCompaction(const VersionStorageInfo* vstorage) const
-      override;
 };

-class NullCompactionPicker : public CompactionPicker {
- public:
-  NullCompactionPicker(const ImmutableCFOptions& ioptions,
-                       const InternalKeyComparator* icmp) :
-      CompactionPicker(ioptions, icmp) {}
-  virtual ~NullCompactionPicker() {}
-
-  // Always return "nullptr"
-  Compaction* PickCompaction(const std::string& cf_name,
-                             const MutableCFOptions& mutable_cf_options,
-                             VersionStorageInfo* vstorage,
-                             LogBuffer* log_buffer) override {
-    return nullptr;
-  }
-
-  // Always return "nullptr"
-  Compaction* CompactRange(
-      const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
-      VersionStorageInfo* vstorage, int input_level, int output_level,
-      uint32_t output_path_id, const InternalKey* begin, const InternalKey* end,
-      InternalKey** compaction_end) override {
-    return nullptr;
-  }
-
-  // Always returns false.
-  virtual bool NeedsCompaction(const VersionStorageInfo* vstorage) const
-      override {
-    return false;
-  }
-};
-#endif  // !ROCKSDB_LITE
-
-CompressionType GetCompressionType(const ImmutableCFOptions& ioptions,
-                                   int level, int base_level,
-                                   const bool enable_compression = true);
+// Utility function
+extern uint64_t TotalCompensatedFileSize(const std::vector<FileMetaData*>& files);

 }  // namespace rocksdb
@@ -4,10 +4,8 @@
 //  of patent rights can be found in the PATENTS file in the same directory.

 #include "db/compaction_picker.h"
-#include <limits>
 #include <string>
 #include "util/logging.h"
-#include "util/string_util.h"
 #include "util/testharness.h"
 #include "util/testutil.h"

@@ -15,137 +13,119 @@ namespace rocksdb {

 class CountingLogger : public Logger {
 public:
-  using Logger::Logv;
  virtual void Logv(const char* format, va_list ap) override { log_count++; }
  size_t log_count;
 };

-class CompactionPickerTest : public testing::Test {
+class CompactionPickerTest {
 public:
-  const Comparator* ucmp_;
-  InternalKeyComparator icmp_;
-  Options options_;
-  ImmutableCFOptions ioptions_;
-  MutableCFOptions mutable_cf_options_;
+  const Comparator* ucmp;
+  InternalKeyComparator icmp;
+  Options options;
+  ImmutableCFOptions ioptions;
+  MutableCFOptions mutable_cf_options;
  LevelCompactionPicker level_compaction_picker;
-  std::string cf_name_;
-  CountingLogger logger_;
-  LogBuffer log_buffer_;
-  uint32_t file_num_;
-  CompactionOptionsFIFO fifo_options_;
-  std::unique_ptr<VersionStorageInfo> vstorage_;
-  std::vector<std::unique_ptr<FileMetaData>> files_;
+  std::string cf_name;
+  CountingLogger logger;
+  LogBuffer log_buffer;
+  VersionStorageInfo vstorage;
+  uint32_t file_num;
+  CompactionOptionsFIFO fifo_options;
+  std::vector<uint64_t> size_being_compacted;

  CompactionPickerTest()
-      : ucmp_(BytewiseComparator()),
-        icmp_(ucmp_),
-        ioptions_(options_),
-        mutable_cf_options_(options_, ioptions_),
-        level_compaction_picker(ioptions_, &icmp_),
-        cf_name_("dummy"),
-        log_buffer_(InfoLogLevel::INFO_LEVEL, &logger_),
-        file_num_(1),
-        vstorage_(nullptr) {
-    fifo_options_.max_table_files_size = 1;
-    mutable_cf_options_.RefreshDerivedOptions(ioptions_);
-    ioptions_.db_paths.emplace_back("dummy",
-                                    std::numeric_limits<uint64_t>::max());
+      : ucmp(BytewiseComparator()),
+        icmp(ucmp),
+        ioptions(options),
+        mutable_cf_options(options, ioptions),
+        level_compaction_picker(ioptions, &icmp),
+        cf_name("dummy"),
+        log_buffer(InfoLogLevel::INFO_LEVEL, &logger),
+        vstorage(&icmp, ucmp, options.num_levels, kCompactionStyleLevel,
+                 nullptr),
+        file_num(1) {
+    fifo_options.max_table_files_size = 1;
+    mutable_cf_options.RefreshDerivedOptions(ioptions);
+    size_being_compacted.resize(options.num_levels);
  }

  ~CompactionPickerTest() {
-  }
-
-  void NewVersionStorage(int num_levels, CompactionStyle style) {
-    DeleteVersionStorage();
-    options_.num_levels = num_levels;
-    vstorage_.reset(new VersionStorageInfo(
-        &icmp_, ucmp_, options_.num_levels, style, nullptr));
-    vstorage_->CalculateBaseBytes(ioptions_, mutable_cf_options_);
-  }
-
-  void DeleteVersionStorage() {
-    vstorage_.reset();
-    files_.clear();
+    for (int i = 0; i < vstorage.num_levels(); i++) {
+      for (auto* f : vstorage.LevelFiles(i)) {
+        delete f;
+      }
+    }
  }

  void Add(int level, uint32_t file_number, const char* smallest,
           const char* largest, uint64_t file_size = 0, uint32_t path_id = 0,
           SequenceNumber smallest_seq = 100,
           SequenceNumber largest_seq = 100) {
-    assert(level < vstorage_->num_levels());
+    assert(level < vstorage.num_levels());
    FileMetaData* f = new FileMetaData;
    f->fd = FileDescriptor(file_number, path_id, file_size);
    f->smallest = InternalKey(smallest, smallest_seq, kTypeValue);
    f->largest = InternalKey(largest, largest_seq, kTypeValue);
-    f->smallest_seqno = smallest_seq;
-    f->largest_seqno = largest_seq;
    f->compensated_file_size = file_size;
    f->refs = 0;
-    vstorage_->AddFile(level, f);
-    files_.emplace_back(f);
+    vstorage.MaybeAddFile(level, f);
  }

  void UpdateVersionStorageInfo() {
-    vstorage_->CalculateBaseBytes(ioptions_, mutable_cf_options_);
-    vstorage_->UpdateFilesBySize();
-    vstorage_->UpdateNumNonEmptyLevels();
-    vstorage_->GenerateFileIndexer();
-    vstorage_->GenerateLevelFilesBrief();
-    vstorage_->ComputeCompactionScore(mutable_cf_options_, fifo_options_);
-    vstorage_->GenerateLevel0NonOverlapping();
-    vstorage_->SetFinalized();
+    vstorage.ComputeCompactionScore(mutable_cf_options, fifo_options,
+                                    size_being_compacted);
+    vstorage.UpdateFilesBySize();
+    vstorage.UpdateNumNonEmptyLevels();
+    vstorage.GenerateFileIndexer();
+    vstorage.GenerateLevelFilesBrief();
+    vstorage.SetFinalized();
  }
 };

-TEST_F(CompactionPickerTest, Empty) {
-  NewVersionStorage(6, kCompactionStyleLevel);
+TEST(CompactionPickerTest, Empty) {
  UpdateVersionStorageInfo();
  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
+      cf_name, mutable_cf_options, &vstorage, &log_buffer));
  ASSERT_TRUE(compaction.get() == nullptr);
 }

-TEST_F(CompactionPickerTest, Single) {
-  NewVersionStorage(6, kCompactionStyleLevel);
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
+TEST(CompactionPickerTest, Single) {
+  mutable_cf_options.level0_file_num_compaction_trigger = 2;
  Add(0, 1U, "p", "q");
  UpdateVersionStorageInfo();

  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
+      cf_name, mutable_cf_options, &vstorage, &log_buffer));
  ASSERT_TRUE(compaction.get() == nullptr);
 }

-TEST_F(CompactionPickerTest, Level0Trigger) {
-  NewVersionStorage(6, kCompactionStyleLevel);
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
+TEST(CompactionPickerTest, Level0Trigger) {
+  mutable_cf_options.level0_file_num_compaction_trigger = 2;
  Add(0, 1U, "150", "200");
  Add(0, 2U, "200", "250");

  UpdateVersionStorageInfo();

  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
+      cf_name, mutable_cf_options, &vstorage, &log_buffer));
  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_files(0));
+  ASSERT_EQ(2, compaction->num_input_files(0));
  ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
  ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
 }

-TEST_F(CompactionPickerTest, Level1Trigger) {
-  NewVersionStorage(6, kCompactionStyleLevel);
+TEST(CompactionPickerTest, Level1Trigger) {
  Add(1, 66U, "150", "200", 1000000000U);
  UpdateVersionStorageInfo();

  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
+      cf_name, mutable_cf_options, &vstorage, &log_buffer));
  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1U, compaction->num_input_files(0));
+  ASSERT_EQ(1, compaction->num_input_files(0));
  ASSERT_EQ(66U, compaction->input(0, 0)->fd.GetNumber());
 }

-TEST_F(CompactionPickerTest, Level1Trigger2) {
-  NewVersionStorage(6, kCompactionStyleLevel);
+TEST(CompactionPickerTest, Level1Trigger2) {
  Add(1, 66U, "150", "200", 1000000001U);
  Add(1, 88U, "201", "300", 1000000000U);
  Add(2, 6U, "150", "179", 1000000000U);
@@ -154,19 +134,18 @@ TEST_F(CompactionPickerTest, Level1Trigger2) {
  UpdateVersionStorageInfo();

  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
+      cf_name, mutable_cf_options, &vstorage, &log_buffer));
  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1U, compaction->num_input_files(0));
-  ASSERT_EQ(2U, compaction->num_input_files(1));
+  ASSERT_EQ(1, compaction->num_input_files(0));
+  ASSERT_EQ(2, compaction->num_input_files(1));
  ASSERT_EQ(66U, compaction->input(0, 0)->fd.GetNumber());
  ASSERT_EQ(6U, compaction->input(1, 0)->fd.GetNumber());
  ASSERT_EQ(7U, compaction->input(1, 1)->fd.GetNumber());
 }

-TEST_F(CompactionPickerTest, LevelMaxScore) {
-  NewVersionStorage(6, kCompactionStyleLevel);
-  mutable_cf_options_.target_file_size_base = 10000000;
-  mutable_cf_options_.target_file_size_multiplier = 10;
+TEST(CompactionPickerTest, LevelMaxScore) {
+  mutable_cf_options.target_file_size_base = 10000000;
+  mutable_cf_options.target_file_size_multiplier = 10;
  Add(0, 1U, "150", "200", 1000000000U);
  // Level 1 score 1.2
  Add(1, 66U, "150", "200", 6000000U);
@@ -183,378 +162,12 @@ TEST_F(CompactionPickerTest, LevelMaxScore) {
  UpdateVersionStorageInfo();

  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
+      cf_name, mutable_cf_options, &vstorage, &log_buffer));
  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1U, compaction->num_input_files(0));
+  ASSERT_EQ(1, compaction->num_input_files(0));
  ASSERT_EQ(7U, compaction->input(0, 0)->fd.GetNumber());
 }

-TEST_F(CompactionPickerTest, NeedsCompactionLevel) {
-  const int kLevels = 6;
-  const int kFileCount = 20;
-
-  for (int level = 0; level < kLevels - 1; ++level) {
-    NewVersionStorage(kLevels, kCompactionStyleLevel);
-    uint64_t file_size = vstorage_->MaxBytesForLevel(level) * 2 / kFileCount;
-    for (int file_count = 1; file_count <= kFileCount; ++file_count) {
-      // start a brand new version in each test.
-      NewVersionStorage(kLevels, kCompactionStyleLevel);
-      for (int i = 0; i < file_count; ++i) {
-        Add(level, i, ToString((i + 100) * 1000).c_str(),
-            ToString((i + 100) * 1000 + 999).c_str(),
-            file_size, 0, i * 100, i * 100 + 99);
-      }
-      UpdateVersionStorageInfo();
-      ASSERT_EQ(vstorage_->CompactionScoreLevel(0), level);
-      ASSERT_EQ(level_compaction_picker.NeedsCompaction(vstorage_.get()),
-                vstorage_->CompactionScore(0) >= 1);
-      // release the version storage
-      DeleteVersionStorage();
-    }
-  }
-}
-
-TEST_F(CompactionPickerTest, Level0TriggerDynamic) {
-  int num_levels = ioptions_.num_levels;
-  ioptions_.level_compaction_dynamic_level_bytes = true;
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
-  mutable_cf_options_.max_bytes_for_level_base = 200;
-  mutable_cf_options_.max_bytes_for_level_multiplier = 10;
-  NewVersionStorage(num_levels, kCompactionStyleLevel);
-  Add(0, 1U, "150", "200");
-  Add(0, 2U, "200", "250");
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_files(0));
-  ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
-  ASSERT_EQ(1, static_cast<int>(compaction->num_input_levels()));
-  ASSERT_EQ(num_levels - 1, compaction->output_level());
-}
-
-TEST_F(CompactionPickerTest, Level0TriggerDynamic2) {
-  int num_levels = ioptions_.num_levels;
-  ioptions_.level_compaction_dynamic_level_bytes = true;
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
-  mutable_cf_options_.max_bytes_for_level_base = 200;
-  mutable_cf_options_.max_bytes_for_level_multiplier = 10;
-  NewVersionStorage(num_levels, kCompactionStyleLevel);
-  Add(0, 1U, "150", "200");
-  Add(0, 2U, "200", "250");
-  Add(num_levels - 1, 3U, "200", "250", 300U);
-
-  UpdateVersionStorageInfo();
-  ASSERT_EQ(vstorage_->base_level(), num_levels - 2);
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_files(0));
-  ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
-  ASSERT_EQ(1, static_cast<int>(compaction->num_input_levels()));
-  ASSERT_EQ(num_levels - 2, compaction->output_level());
-}
-
-TEST_F(CompactionPickerTest, Level0TriggerDynamic3) {
-  int num_levels = ioptions_.num_levels;
-  ioptions_.level_compaction_dynamic_level_bytes = true;
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
-  mutable_cf_options_.max_bytes_for_level_base = 200;
-  mutable_cf_options_.max_bytes_for_level_multiplier = 10;
-  NewVersionStorage(num_levels, kCompactionStyleLevel);
-  Add(0, 1U, "150", "200");
-  Add(0, 2U, "200", "250");
-  Add(num_levels - 1, 3U, "200", "250", 300U);
-  Add(num_levels - 1, 4U, "300", "350", 3000U);
-
-  UpdateVersionStorageInfo();
-  ASSERT_EQ(vstorage_->base_level(), num_levels - 3);
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_files(0));
-  ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
-  ASSERT_EQ(1, static_cast<int>(compaction->num_input_levels()));
-  ASSERT_EQ(num_levels - 3, compaction->output_level());
-}
-
-TEST_F(CompactionPickerTest, Level0TriggerDynamic4) {
-  int num_levels = ioptions_.num_levels;
-  ioptions_.level_compaction_dynamic_level_bytes = true;
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
-  mutable_cf_options_.max_bytes_for_level_base = 200;
-  mutable_cf_options_.max_bytes_for_level_multiplier = 10;
-  NewVersionStorage(num_levels, kCompactionStyleLevel);
-  Add(0, 1U, "150", "200");
-  Add(0, 2U, "200", "250");
-  Add(num_levels - 1, 3U, "200", "250", 300U);
-  Add(num_levels - 1, 4U, "300", "350", 3000U);
-  Add(num_levels - 3, 5U, "150", "180", 3U);
-  Add(num_levels - 3, 6U, "181", "300", 3U);
-  Add(num_levels - 3, 7U, "400", "450", 3U);
-
-  UpdateVersionStorageInfo();
-  ASSERT_EQ(vstorage_->base_level(), num_levels - 3);
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_files(0));
-  ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->num_input_files(1));
-  ASSERT_EQ(num_levels - 3, compaction->level(1));
-  ASSERT_EQ(5U, compaction->input(1, 0)->fd.GetNumber());
-  ASSERT_EQ(6U, compaction->input(1, 1)->fd.GetNumber());
-  ASSERT_EQ(2, static_cast<int>(compaction->num_input_levels()));
-  ASSERT_EQ(num_levels - 3, compaction->output_level());
-}
-
-TEST_F(CompactionPickerTest, LevelTriggerDynamic4) {
-  int num_levels = ioptions_.num_levels;
-  ioptions_.level_compaction_dynamic_level_bytes = true;
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
-  mutable_cf_options_.max_bytes_for_level_base = 200;
-  mutable_cf_options_.max_bytes_for_level_multiplier = 10;
-  NewVersionStorage(num_levels, kCompactionStyleLevel);
-  Add(0, 1U, "150", "200");
-  Add(num_levels - 1, 3U, "200", "250", 300U);
-  Add(num_levels - 1, 4U, "300", "350", 3000U);
-  Add(num_levels - 1, 4U, "400", "450", 3U);
-  Add(num_levels - 2, 5U, "150", "180", 300U);
-  Add(num_levels - 2, 6U, "181", "350", 500U);
-  Add(num_levels - 2, 7U, "400", "450", 200U);
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1U, compaction->num_input_files(0));
-  ASSERT_EQ(6U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->num_input_files(1));
-  ASSERT_EQ(3U, compaction->input(1, 0)->fd.GetNumber());
-  ASSERT_EQ(4U, compaction->input(1, 1)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->num_input_levels());
-  ASSERT_EQ(num_levels - 1, compaction->output_level());
-}
-
-// Universal and FIFO Compactions are not supported in ROCKSDB_LITE
-#ifndef ROCKSDB_LITE
-TEST_F(CompactionPickerTest, NeedsCompactionUniversal) {
-  NewVersionStorage(1, kCompactionStyleUniversal);
-  UniversalCompactionPicker universal_compaction_picker(
-      ioptions_, &icmp_);
-  // must return false when there's no files.
-  ASSERT_EQ(universal_compaction_picker.NeedsCompaction(vstorage_.get()),
-            false);
-  UpdateVersionStorageInfo();
-
-  // verify the trigger given different number of L0 files.
-  for (int i = 1;
-       i <= mutable_cf_options_.level0_file_num_compaction_trigger * 2; ++i) {
-    NewVersionStorage(1, kCompactionStyleUniversal);
-    Add(0, i, ToString((i + 100) * 1000).c_str(),
-        ToString((i + 100) * 1000 + 999).c_str(), 1000000, 0, i * 100,
-        i * 100 + 99);
-    UpdateVersionStorageInfo();
-    ASSERT_EQ(level_compaction_picker.NeedsCompaction(vstorage_.get()),
-              vstorage_->CompactionScore(0) >= 1);
-  }
-}
-// Tests if the files can be trivially moved in multi level
-// universal compaction when allow_trivial_move option is set
-// In this test as the input files overlaps, they cannot
-// be trivially moved.
-
-TEST_F(CompactionPickerTest, CannotTrivialMoveUniversal) {
-  const uint64_t kFileSize = 100000;
-
-  ioptions_.compaction_options_universal.allow_trivial_move = true;
-  NewVersionStorage(1, kCompactionStyleUniversal);
-  UniversalCompactionPicker universal_compaction_picker(ioptions_, &icmp_);
-  // must return false when there's no files.
-  ASSERT_EQ(universal_compaction_picker.NeedsCompaction(vstorage_.get()),
-            false);
-
-  NewVersionStorage(3, kCompactionStyleUniversal);
-
-  Add(0, 1U, "150", "200", kFileSize, 0, 500, 550);
-  Add(0, 2U, "201", "250", kFileSize, 0, 401, 450);
-  Add(0, 4U, "260", "300", kFileSize, 0, 260, 300);
-  Add(1, 5U, "100", "151", kFileSize, 0, 200, 251);
-  Add(1, 3U, "301", "350", kFileSize, 0, 101, 150);
-  Add(2, 6U, "120", "200", kFileSize, 0, 20, 100);
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(
-      universal_compaction_picker.PickCompaction(
-          cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-
-  ASSERT_TRUE(!compaction->is_trivial_move());
-}
-// Tests if the files can be trivially moved in multi level
-// universal compaction when allow_trivial_move option is set
-// In this test as the input files doesn't overlaps, they should
-// be trivially moved.
-TEST_F(CompactionPickerTest, AllowsTrivialMoveUniversal) {
-  const uint64_t kFileSize = 100000;
-
-  ioptions_.compaction_options_universal.allow_trivial_move = true;
-  UniversalCompactionPicker universal_compaction_picker(ioptions_, &icmp_);
-
-  NewVersionStorage(3, kCompactionStyleUniversal);
-
-  Add(0, 1U, "150", "200", kFileSize, 0, 500, 550);
-  Add(0, 2U, "201", "250", kFileSize, 0, 401, 450);
-  Add(0, 4U, "260", "300", kFileSize, 0, 260, 300);
-  Add(1, 5U, "010", "080", kFileSize, 0, 200, 251);
-  Add(2, 3U, "301", "350", kFileSize, 0, 101, 150);
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(
-      universal_compaction_picker.PickCompaction(
-          cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-
-  ASSERT_TRUE(compaction->is_trivial_move());
-}
-
-TEST_F(CompactionPickerTest, NeedsCompactionFIFO) {
-  NewVersionStorage(1, kCompactionStyleFIFO);
-  const int kFileCount =
-      mutable_cf_options_.level0_file_num_compaction_trigger * 3;
-  const uint64_t kFileSize = 100000;
-  const uint64_t kMaxSize = kFileSize * kFileCount / 2;
-
-  fifo_options_.max_table_files_size = kMaxSize;
-  ioptions_.compaction_options_fifo = fifo_options_;
-  FIFOCompactionPicker fifo_compaction_picker(ioptions_, &icmp_);
-
-  UpdateVersionStorageInfo();
-  // must return false when there's no files.
-  ASSERT_EQ(fifo_compaction_picker.NeedsCompaction(vstorage_.get()), false);
-
-  // verify whether compaction is needed based on the current
-  // size of L0 files.
-  uint64_t current_size = 0;
-  for (int i = 1; i <= kFileCount; ++i) {
-    NewVersionStorage(1, kCompactionStyleFIFO);
-    Add(0, i, ToString((i + 100) * 1000).c_str(),
-        ToString((i + 100) * 1000 + 999).c_str(),
-        kFileSize, 0, i * 100, i * 100 + 99);
-    current_size += kFileSize;
-    UpdateVersionStorageInfo();
-    ASSERT_EQ(level_compaction_picker.NeedsCompaction(vstorage_.get()),
-              vstorage_->CompactionScore(0) >= 1);
-  }
-}
-#endif  // ROCKSDB_LITE
-
-// This test exhibits the bug where we don't properly reset parent_index in
-// PickCompaction()
-TEST_F(CompactionPickerTest, ParentIndexResetBug) {
-  int num_levels = ioptions_.num_levels;
-  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
-  mutable_cf_options_.max_bytes_for_level_base = 200;
-  NewVersionStorage(num_levels, kCompactionStyleLevel);
-  Add(0, 1U, "150", "200");       // <- marked for compaction
-  Add(1, 3U, "400", "500", 600);  // <- this one needs compacting
-  Add(2, 4U, "150", "200");
-  Add(2, 5U, "201", "210");
-  Add(2, 6U, "300", "310");
-  Add(2, 7U, "400", "500");  // <- being compacted
-
-  vstorage_->LevelFiles(2)[3]->being_compacted = true;
-  vstorage_->LevelFiles(0)[0]->marked_for_compaction = true;
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-}
-
-// This test checks ExpandWhileOverlapping() by having overlapping user keys
-// ranges (with different sequence numbers) in the input files.
-TEST_F(CompactionPickerTest, OverlappingUserKeys) {
-  NewVersionStorage(6, kCompactionStyleLevel);
-  Add(1, 1U, "100", "150", 1U);
-  // Overlapping user keys
-  Add(1, 2U, "200", "400", 1U);
-  Add(1, 3U, "400", "500", 1000000000U, 0, 0);
-  Add(2, 4U, "600", "700", 1U);
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-              cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1U, compaction->num_input_levels());
-  ASSERT_EQ(2U, compaction->num_input_files(0));
-  ASSERT_EQ(2U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(3U, compaction->input(0, 1)->fd.GetNumber());
-}
-
-TEST_F(CompactionPickerTest, OverlappingUserKeys2) {
-  NewVersionStorage(6, kCompactionStyleLevel);
-  // Overlapping user keys on same level and output level
-  Add(1, 1U, "200", "400", 1000000000U);
-  Add(1, 2U, "400", "500", 1U, 0, 0);
-  Add(2, 3U, "400", "600", 1U);
-  // The following file is not in the compaction despite overlapping user keys
-  Add(2, 4U, "600", "700", 1U, 0, 0);
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-              cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_levels());
-  ASSERT_EQ(2U, compaction->num_input_files(0));
-  ASSERT_EQ(1U, compaction->num_input_files(1));
-  ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
-  ASSERT_EQ(3U, compaction->input(1, 0)->fd.GetNumber());
-}
-
-TEST_F(CompactionPickerTest, OverlappingUserKeys3) {
-  NewVersionStorage(6, kCompactionStyleLevel);
-  // Chain of overlapping user key ranges (forces ExpandWhileOverlapping() to
-  // expand multiple times)
-  Add(1, 1U, "100", "150", 1U);
-  Add(1, 2U, "150", "200", 1U, 0, 0);
-  Add(1, 3U, "200", "250", 1000000000U, 0, 0);
-  Add(1, 4U, "250", "300", 1U, 0, 0);
-  Add(1, 5U, "300", "350", 1U, 0, 0);
-  // Output level overlaps with the beginning and the end of the chain
-  Add(2, 6U, "050", "100", 1U);
-  Add(2, 7U, "350", "400", 1U);
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-              cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_levels());
-  ASSERT_EQ(5U, compaction->num_input_files(0));
-  ASSERT_EQ(2U, compaction->num_input_files(1));
-  ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
-  ASSERT_EQ(3U, compaction->input(0, 2)->fd.GetNumber());
-  ASSERT_EQ(4U, compaction->input(0, 3)->fd.GetNumber());
-  ASSERT_EQ(5U, compaction->input(0, 4)->fd.GetNumber());
-  ASSERT_EQ(6U, compaction->input(1, 0)->fd.GetNumber());
-  ASSERT_EQ(7U, compaction->input(1, 1)->fd.GetNumber());
-}
-
 }  // namespace rocksdb

-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
+int main(int argc, char** argv) { return rocksdb::test::RunAllTests(); }
@@ -10,7 +10,6 @@
 #include "rocksdb/db.h"
 #include "rocksdb/env.h"
 #include "util/hash.h"
-#include "util/string_util.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
 #include "utilities/merge_operators.h"
@@ -34,20 +33,18 @@ typedef std::map<std::string, std::string, MapComparator> KVMap;
 class KVIter : public Iterator {
 public:
  explicit KVIter(const KVMap* map) : map_(map), iter_(map_->end()) {}
-  virtual bool Valid() const override { return iter_ != map_->end(); }
-  virtual void SeekToFirst() override { iter_ = map_->begin(); }
-  virtual void SeekToLast() override {
+  virtual bool Valid() const { return iter_ != map_->end(); }
+  virtual void SeekToFirst() { iter_ = map_->begin(); }
+  virtual void SeekToLast() {
    if (map_->empty()) {
      iter_ = map_->end();
    } else {
      iter_ = map_->find(map_->rbegin()->first);
    }
  }
-  virtual void Seek(const Slice& k) override {
-    iter_ = map_->lower_bound(k.ToString());
-  }
-  virtual void Next() override { ++iter_; }
-  virtual void Prev() override {
+  virtual void Seek(const Slice& k) { iter_ = map_->lower_bound(k.ToString()); }
+  virtual void Next() { ++iter_; }
+  virtual void Prev() {
    if (iter_ == map_->begin()) {
      iter_ = map_->end();
      return;
@@ -55,9 +52,9 @@ class KVIter : public Iterator {
    --iter_;
  }

-  virtual Slice key() const override { return iter_->first; }
-  virtual Slice value() const override { return iter_->second; }
-  virtual Status status() const override { return Status::OK(); }
+  virtual Slice key() const { return iter_->first; }
+  virtual Slice value() const { return iter_->second; }
+  virtual Status status() const { return Status::OK(); }

 private:
  const KVMap* const map_;
@@ -85,7 +82,7 @@ void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
    }

    int type = rnd->Uniform(2);
-    int index = rnd->Uniform(static_cast<int>(source_strings.size()));
+    int index = rnd->Uniform(source_strings.size());
    auto& key = source_strings[index];
    switch (type) {
      case 0:
@@ -127,7 +124,7 @@ void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
        break;
      case 2: {
        // Seek to random key
-        auto key_idx = rnd->Uniform(static_cast<int>(source_strings.size()));
+        auto key_idx = rnd->Uniform(source_strings.size());
        auto key = source_strings[key_idx];
        iter->Seek(key);
        result_iter->Seek(key);
@@ -153,7 +150,7 @@ void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
        break;
      default: {
        assert(type == 5);
-        auto key_idx = rnd->Uniform(static_cast<int>(source_strings.size()));
+        auto key_idx = rnd->Uniform(source_strings.size());
        auto key = source_strings[key_idx];
        std::string result;
        auto status = db->Get(ReadOptions(), key, &result);
@@ -174,16 +171,11 @@ class DoubleComparator : public Comparator {
 public:
  DoubleComparator() {}

-  virtual const char* Name() const override { return "DoubleComparator"; }
+  virtual const char* Name() const { return "DoubleComparator"; }

-  virtual int Compare(const Slice& a, const Slice& b) const override {
-#ifndef CYGWIN
+  virtual int Compare(const Slice& a, const Slice& b) const {
    double da = std::stod(a.ToString());
    double db = std::stod(b.ToString());
-#else
-    double da = std::strtod(a.ToString().c_str(), 0 /* endptr */);
-    double db = std::strtod(a.ToString().c_str(), 0 /* endptr */);
-#endif
    if (da == db) {
      return a.compare(b);
    } else if (da > db) {
@@ -193,18 +185,18 @@ class DoubleComparator : public Comparator {
    }
  }
  virtual void FindShortestSeparator(std::string* start,
-                                     const Slice& limit) const override {}
+                                     const Slice& limit) const {}

-  virtual void FindShortSuccessor(std::string* key) const override {}
+  virtual void FindShortSuccessor(std::string* key) const {}
 };

 class HashComparator : public Comparator {
 public:
  HashComparator() {}

-  virtual const char* Name() const override { return "HashComparator"; }
+  virtual const char* Name() const { return "HashComparator"; }

-  virtual int Compare(const Slice& a, const Slice& b) const override {
+  virtual int Compare(const Slice& a, const Slice& b) const {
    uint32_t ha = Hash(a.data(), a.size(), 66);
    uint32_t hb = Hash(b.data(), b.size(), 66);
    if (ha == hb) {
@@ -216,18 +208,18 @@ class HashComparator : public Comparator {
    }
  }
  virtual void FindShortestSeparator(std::string* start,
-                                     const Slice& limit) const override {}
+                                     const Slice& limit) const {}

-  virtual void FindShortSuccessor(std::string* key) const override {}
+  virtual void FindShortSuccessor(std::string* key) const {}
 };

 class TwoStrComparator : public Comparator {
 public:
  TwoStrComparator() {}

-  virtual const char* Name() const override { return "TwoStrComparator"; }
+  virtual const char* Name() const { return "TwoStrComparator"; }

-  virtual int Compare(const Slice& a, const Slice& b) const override {
+  virtual int Compare(const Slice& a, const Slice& b) const {
    assert(a.size() >= 2);
    assert(b.size() >= 2);
    size_t size_a1 = static_cast<size_t>(a[0]);
@@ -248,13 +240,13 @@ class TwoStrComparator : public Comparator {
    return a2.compare(b2);
  }
  virtual void FindShortestSeparator(std::string* start,
-                                     const Slice& limit) const override {}
+                                     const Slice& limit) const {}

-  virtual void FindShortSuccessor(std::string* key) const override {}
+  virtual void FindShortSuccessor(std::string* key) const {}
 };
 }  // namespace

-class ComparatorDBTest : public testing::Test {
+class ComparatorDBTest {
 private:
  std::string dbname_;
  Env* env_;
@@ -266,12 +258,12 @@ class ComparatorDBTest : public testing::Test {
  ComparatorDBTest() : env_(Env::Default()), db_(nullptr) {
    comparator = BytewiseComparator();
    dbname_ = test::TmpDir() + "/comparator_db_test";
-    EXPECT_OK(DestroyDB(dbname_, last_options_));
+    ASSERT_OK(DestroyDB(dbname_, last_options_));
  }

  ~ComparatorDBTest() {
    delete db_;
-    EXPECT_OK(DestroyDB(dbname_, last_options_));
+    ASSERT_OK(DestroyDB(dbname_, last_options_));
    comparator = BytewiseComparator();
  }

@@ -307,7 +299,7 @@ class ComparatorDBTest : public testing::Test {
  }
 };

-TEST_F(ComparatorDBTest, Bytewise) {
+TEST(ComparatorDBTest, Bytewise) {
  for (int rand_seed = 301; rand_seed < 306; rand_seed++) {
    DestroyAndReopen();
    Random rnd(rand_seed);
@@ -317,7 +309,7 @@ TEST_F(ComparatorDBTest, Bytewise) {
  }
 }

-TEST_F(ComparatorDBTest, SimpleSuffixReverseComparator) {
+TEST(ComparatorDBTest, SimpleSuffixReverseComparator) {
  SetOwnedComparator(new test::SimpleSuffixReverseComparator());

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
@@ -333,7 +325,7 @@ TEST_F(ComparatorDBTest, SimpleSuffixReverseComparator) {
      source_prefixes.push_back(test::RandomHumanReadableString(&rnd, 8));
    }
    for (int j = 0; j < 20; j++) {
-      int prefix_index = rnd.Uniform(static_cast<int>(source_prefixes.size()));
+      int prefix_index = rnd.Uniform(source_prefixes.size());
      std::string key = source_prefixes[prefix_index] +
                        test::RandomHumanReadableString(&rnd, rnd.Uniform(8));
      source_strings.push_back(key);
@@ -343,7 +335,7 @@ TEST_F(ComparatorDBTest, SimpleSuffixReverseComparator) {
  }
 }

-TEST_F(ComparatorDBTest, Uint64Comparator) {
+TEST(ComparatorDBTest, Uint64Comparator) {
  SetOwnedComparator(test::Uint64Comparator());

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
@@ -367,7 +359,7 @@ TEST_F(ComparatorDBTest, Uint64Comparator) {
  }
 }

-TEST_F(ComparatorDBTest, DoubleComparator) {
+TEST(ComparatorDBTest, DoubleComparator) {
  SetOwnedComparator(new DoubleComparator());

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
@@ -385,14 +377,14 @@ TEST_F(ComparatorDBTest, DoubleComparator) {
      for (uint32_t j = 0; j < divide_order; j++) {
        to_divide *= 10.0;
      }
-      source_strings.push_back(ToString(r / to_divide));
+      source_strings.push_back(std::to_string(r / to_divide));
    }

    DoRandomIteraratorTest(GetDB(), source_strings, &rnd, 200, 1000, 66);
  }
 }

-TEST_F(ComparatorDBTest, HashComparator) {
+TEST(ComparatorDBTest, HashComparator) {
  SetOwnedComparator(new HashComparator());

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
@@ -411,7 +403,7 @@ TEST_F(ComparatorDBTest, HashComparator) {
  }
 }

-TEST_F(ComparatorDBTest, TwoStrComparator) {
+TEST(ComparatorDBTest, TwoStrComparator) {
  SetOwnedComparator(new TwoStrComparator());

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
@@ -439,7 +431,4 @@ TEST_F(ComparatorDBTest, TwoStrComparator) {

 }  // namespace rocksdb

-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
+int main(int argc, char** argv) { return rocksdb::test::RunAllTests(); }
@@ -29,7 +29,7 @@ namespace rocksdb {

 static const int kValueSize = 1000;

-class CorruptionTest : public testing::Test {
+class CorruptionTest {
 public:
  test::ErrorEnv env_;
  std::string dbname_;
@@ -57,11 +57,6 @@ class CorruptionTest : public testing::Test {
     DestroyDB(dbname_, Options());
  }

-  void CloseDb() {
-    delete db_;
-    db_ = nullptr;
-  }
-
  Status TryReopen(Options* options = nullptr) {
    delete db_;
    db_ = nullptr;
@@ -108,7 +103,7 @@ class CorruptionTest : public testing::Test {
    // db itself will raise errors because data is corrupted.
    // Instead, we want the reads to be successful and this test
    // will detect whether the appropriate corruptions have
-    // occurred.
+    // occured.
    Iterator* iter = db_->NewIterator(ReadOptions(false, true));
    for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
      uint64_t key;
@@ -120,8 +115,8 @@ class CorruptionTest : public testing::Test {
        continue;
      }
      missed += (key - next_expected);
-      next_expected = static_cast<unsigned int>(key + 1);
-      if (iter->value() != Value(static_cast<int>(key), &value_space)) {
+      next_expected = key + 1;
+      if (iter->value() != Value(key, &value_space)) {
        bad_values++;
      } else {
        correct++;
@@ -148,14 +143,14 @@ class CorruptionTest : public testing::Test {
      if (-offset > sbuf.st_size) {
        offset = 0;
      } else {
-        offset = static_cast<int>(sbuf.st_size + offset);
+        offset = sbuf.st_size + offset;
      }
    }
    if (offset > sbuf.st_size) {
-      offset = static_cast<int>(sbuf.st_size);
+      offset = sbuf.st_size;
    }
    if (offset + bytes_to_corrupt > sbuf.st_size) {
-      bytes_to_corrupt = static_cast<int>(sbuf.st_size - offset);
+      bytes_to_corrupt = sbuf.st_size - offset;
    }

    // Do it
@@ -182,7 +177,7 @@ class CorruptionTest : public testing::Test {
          type == filetype &&
          static_cast<int>(number) > picked_number) {  // Pick latest file
        fname = dbname_ + "/" + filenames[i];
-        picked_number = static_cast<int>(number);
+        picked_number = number;
      }
    }
    ASSERT_TRUE(!fname.empty()) << filetype;
@@ -231,40 +226,27 @@ class CorruptionTest : public testing::Test {
  }
 };

-TEST_F(CorruptionTest, Recovery) {
+TEST(CorruptionTest, Recovery) {
  Build(100);
  Check(100, 100);
-#ifdef OS_WIN
-  // On Wndows OS Disk cache does not behave properly
-  // We do not call FlushBuffers on every Flush. If we do not close
-  // the log file prior to the corruption we end up with the first
-  // block not corrupted but only the second. However, under the debugger
-  // things work just fine but never pass when running normally
-  // For that reason people may want to run with unbuffered I/O. That option
-  // is not available for WAL though.
-  CloseDb();
-#endif
  Corrupt(kLogFile, 19, 1);      // WriteBatch tag for first record
  Corrupt(kLogFile, log::kBlockSize + 1000, 1);  // Somewhere in second block
-  ASSERT_TRUE(!TryReopen().ok());
-  options_.paranoid_checks = false;
-  Reopen(&options_);
+  Reopen();

  // The 64 records in the first two log blocks are completely lost.
  Check(36, 36);
 }

-TEST_F(CorruptionTest, RecoverWriteError) {
+TEST(CorruptionTest, RecoverWriteError) {
  env_.writable_file_error_ = true;
  Status s = TryReopen();
  ASSERT_TRUE(!s.ok());
 }

-TEST_F(CorruptionTest, NewFileErrorDuringWrite) {
+TEST(CorruptionTest, NewFileErrorDuringWrite) {
  // Do enough writing to force minor compaction
  env_.writable_file_error_ = true;
-  const int num =
-      static_cast<int>(3 + (Options().write_buffer_size / kValueSize));
+  const int num = 3 + (Options().write_buffer_size / kValueSize);
  std::string value_storage;
  Status s;
  bool failed = false;
@@ -283,7 +265,7 @@ TEST_F(CorruptionTest, NewFileErrorDuringWrite) {
  Reopen();
 }

-TEST_F(CorruptionTest, TableFile) {
+TEST(CorruptionTest, TableFile) {
  Build(100);
  DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
  dbi->TEST_FlushMemTable();
@@ -294,7 +276,7 @@ TEST_F(CorruptionTest, TableFile) {
  Check(99, 99);
 }

-TEST_F(CorruptionTest, TableFileIndexData) {
+TEST(CorruptionTest, TableFileIndexData) {
  Build(10000);  // Enough to build multiple Tables
  DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
  dbi->TEST_FlushMemTable();
@@ -304,14 +286,14 @@ TEST_F(CorruptionTest, TableFileIndexData) {
  Check(5000, 9999);
 }

-TEST_F(CorruptionTest, MissingDescriptor) {
+TEST(CorruptionTest, MissingDescriptor) {
  Build(1000);
  RepairDB();
  Reopen();
  Check(1000, 1000);
 }

-TEST_F(CorruptionTest, SequenceNumberRecovery) {
+TEST(CorruptionTest, SequenceNumberRecovery) {
  ASSERT_OK(db_->Put(WriteOptions(), "foo", "v1"));
  ASSERT_OK(db_->Put(WriteOptions(), "foo", "v2"));
  ASSERT_OK(db_->Put(WriteOptions(), "foo", "v3"));
@@ -332,7 +314,7 @@ TEST_F(CorruptionTest, SequenceNumberRecovery) {
  ASSERT_EQ("v6", v);
 }

-TEST_F(CorruptionTest, CorruptedDescriptor) {
+TEST(CorruptionTest, CorruptedDescriptor) {
  ASSERT_OK(db_->Put(WriteOptions(), "foo", "hello"));
  DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
  dbi->TEST_FlushMemTable();
@@ -349,15 +331,15 @@ TEST_F(CorruptionTest, CorruptedDescriptor) {
  ASSERT_EQ("hello", v);
 }

-TEST_F(CorruptionTest, CompactionInputError) {
+TEST(CorruptionTest, CompactionInputError) {
  Options options;
+  options.max_background_flushes = 0;
  Reopen(&options);
  Build(10);
  DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
  dbi->TEST_FlushMemTable();
-  dbi->TEST_CompactRange(0, nullptr, nullptr);
-  dbi->TEST_CompactRange(1, nullptr, nullptr);
-  ASSERT_EQ(1, Property("rocksdb.num-files-at-level2"));
+  const int last = dbi->MaxMemCompactionLevel();
+  ASSERT_EQ(1, Property("rocksdb.num-files-at-level" + NumberToString(last)));

  Corrupt(kTableFile, 100, 1);
  Check(9, 9);
@@ -367,25 +349,23 @@ TEST_F(CorruptionTest, CompactionInputError) {
  Check(10000, 10000);
 }

-TEST_F(CorruptionTest, CompactionInputErrorParanoid) {
+TEST(CorruptionTest, CompactionInputErrorParanoid) {
  Options options;
  options.paranoid_checks = true;
  options.write_buffer_size = 131072;
  options.max_write_buffer_number = 2;
+  options.max_background_flushes = 0;
  Reopen(&options);
  DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);

-  // Fill levels >= 1
+  // Fill levels >= 1 so memtable flush outputs to level 0
  for (int level = 1; level < dbi->NumberLevels(); level++) {
    dbi->Put(WriteOptions(), "", "begin");
    dbi->Put(WriteOptions(), "~", "end");
    dbi->TEST_FlushMemTable();
-    for (int comp_level = 0; comp_level < dbi->NumberLevels() - level;
-         ++comp_level) {
-      dbi->TEST_CompactRange(comp_level, nullptr, nullptr);
-    }
  }

+  options.max_mem_compaction_level = 0;
  Reopen(&options);

  dbi = reinterpret_cast<DBImpl*>(db_);
@@ -412,7 +392,7 @@ TEST_F(CorruptionTest, CompactionInputErrorParanoid) {
  ASSERT_TRUE(!s.ok()) << "write did not fail in corrupted paranoid db";
 }

-TEST_F(CorruptionTest, UnrelatedKeys) {
+TEST(CorruptionTest, UnrelatedKeys) {
  Build(10);
  DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
  dbi->TEST_FlushMemTable();
@@ -428,7 +408,7 @@ TEST_F(CorruptionTest, UnrelatedKeys) {
  ASSERT_EQ(Value(1000, &tmp2).ToString(), v);
 }

-TEST_F(CorruptionTest, FileSystemStateCorrupted) {
+TEST(CorruptionTest, FileSystemStateCorrupted) {
  for (int iter = 0; iter < 2; ++iter) {
    Options options;
    options.paranoid_checks = true;
@@ -464,6 +444,5 @@ TEST_F(CorruptionTest, FileSystemStateCorrupted) {
 }  // namespace rocksdb

 int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+  return rocksdb::test::RunAllTests();
 }
@@ -3,8 +3,6 @@
 //  LICENSE file in the root directory of this source tree. An additional grant
 //  of patent rights can be found in the PATENTS file in the same directory.

-#ifndef ROCKSDB_LITE
-
 #include "db/db_impl.h"
 #include "rocksdb/db.h"
 #include "rocksdb/env.h"
@@ -16,7 +14,7 @@

 namespace rocksdb {

-class CuckooTableDBTest : public testing::Test {
+class CuckooTableDBTest {
 private:
  std::string dbname_;
  Env* env_;
@@ -25,14 +23,14 @@ class CuckooTableDBTest : public testing::Test {
 public:
  CuckooTableDBTest() : env_(Env::Default()) {
    dbname_ = test::TmpDir() + "/cuckoo_table_db_test";
-    EXPECT_OK(DestroyDB(dbname_, Options()));
+    ASSERT_OK(DestroyDB(dbname_, Options()));
    db_ = nullptr;
    Reopen();
  }

  ~CuckooTableDBTest() {
    delete db_;
-    EXPECT_OK(DestroyDB(dbname_, Options()));
+    ASSERT_OK(DestroyDB(dbname_, Options()));
  }

  Options CurrentOptions() {
@@ -41,6 +39,7 @@ class CuckooTableDBTest : public testing::Test {
    options.memtable_factory.reset(NewHashLinkListRepFactory(4, 0, 3, true));
    options.allow_mmap_reads = true;
    options.create_if_missing = true;
+    options.max_mem_compaction_level = 0;
    return options;
  }

@@ -84,15 +83,16 @@ class CuckooTableDBTest : public testing::Test {

  int NumTableFilesAtLevel(int level) {
    std::string property;
-    EXPECT_TRUE(db_->GetProperty(
-        "rocksdb.num-files-at-level" + NumberToString(level), &property));
+    ASSERT_TRUE(
+        db_->GetProperty("rocksdb.num-files-at-level" + NumberToString(level),
+                         &property));
    return atoi(property.c_str());
  }

  // Return spread of files per level
  std::string FilesPerLevel() {
    std::string result;
-    size_t last_non_zero_offset = 0;
+    int last_non_zero_offset = 0;
    for (int level = 0; level < db_->NumberLevels(); level++) {
      int f = NumTableFilesAtLevel(level);
      char buf[100];
@@ -107,7 +107,7 @@ class CuckooTableDBTest : public testing::Test {
  }
 };

-TEST_F(CuckooTableDBTest, Flush) {
+TEST(CuckooTableDBTest, Flush) {
  // Try with empty DB first.
  ASSERT_TRUE(dbfull() != nullptr);
  ASSERT_EQ("NOT_FOUND", Get("key2"));
@@ -170,7 +170,7 @@ TEST_F(CuckooTableDBTest, Flush) {
  ASSERT_EQ("NOT_FOUND", Get("key6"));
 }

-TEST_F(CuckooTableDBTest, FlushWithDuplicateKeys) {
+TEST(CuckooTableDBTest, FlushWithDuplicateKeys) {
  Options options = CurrentOptions();
  Reopen(&options);
  ASSERT_OK(Put("key1", "v1"));
@@ -201,7 +201,7 @@ static std::string Uint64Key(uint64_t i) {
 }
 }  // namespace.

-TEST_F(CuckooTableDBTest, Uint64Comparator) {
+TEST(CuckooTableDBTest, Uint64Comparator) {
  Options options = CurrentOptions();
  options.comparator = test::Uint64Comparator();
  Reopen(&options);
@@ -228,7 +228,34 @@ TEST_F(CuckooTableDBTest, Uint64Comparator) {
  ASSERT_EQ("v4", Get(Uint64Key(4)));
 }

-TEST_F(CuckooTableDBTest, CompactionIntoMultipleFiles) {
+TEST(CuckooTableDBTest, CompactionTrigger) {
+  Options options = CurrentOptions();
+  options.write_buffer_size = 100 << 10;  // 100KB
+  options.level0_file_num_compaction_trigger = 2;
+  Reopen(&options);
+
+  // Write 11 values, each 10016 B
+  for (int idx = 0; idx < 11; ++idx) {
+    ASSERT_OK(Put(Key(idx), std::string(10000, 'a' + idx)));
+  }
+  dbfull()->TEST_WaitForFlushMemTable();
+  ASSERT_EQ("1", FilesPerLevel());
+
+  // Generate one more file in level-0, and should trigger level-0 compaction
+  for (int idx = 11; idx < 22; ++idx) {
+    ASSERT_OK(Put(Key(idx), std::string(10000, 'a' + idx)));
+  }
+  dbfull()->TEST_WaitForFlushMemTable();
+  ASSERT_EQ("2", FilesPerLevel());
+
+  dbfull()->TEST_CompactRange(0, nullptr, nullptr);
+  ASSERT_EQ("0,2", FilesPerLevel());
+  for (int idx = 0; idx < 22; ++idx) {
+    ASSERT_EQ(std::string(10000, 'a' + idx), Get(Key(idx)));
+  }
+}
+
+TEST(CuckooTableDBTest, CompactionIntoMultipleFiles) {
  // Create a big L0 file and check it compacts into multiple files in L1.
  Options options = CurrentOptions();
  options.write_buffer_size = 270 << 10;
@@ -244,15 +271,14 @@ TEST_F(CuckooTableDBTest, CompactionIntoMultipleFiles) {
  dbfull()->TEST_WaitForFlushMemTable();
  ASSERT_EQ("1", FilesPerLevel());

-  dbfull()->TEST_CompactRange(0, nullptr, nullptr, nullptr,
-                              true /* disallow trivial move */);
+  dbfull()->TEST_CompactRange(0, nullptr, nullptr);
  ASSERT_EQ("0,2", FilesPerLevel());
  for (int idx = 0; idx < 28; ++idx) {
    ASSERT_EQ(std::string(10000, 'a' + idx), Get(Key(idx)));
  }
 }

-TEST_F(CuckooTableDBTest, SameKeyInsertedInTwoDifferentFilesAndCompacted) {
+TEST(CuckooTableDBTest, SameKeyInsertedInTwoDifferentFilesAndCompacted) {
  // Insert same key twice so that they go to different SST files. Then wait for
  // compaction and check if the latest value is stored and old value removed.
  Options options = CurrentOptions();
@@ -280,7 +306,7 @@ TEST_F(CuckooTableDBTest, SameKeyInsertedInTwoDifferentFilesAndCompacted) {
  }
 }

-TEST_F(CuckooTableDBTest, AdaptiveTable) {
+TEST(CuckooTableDBTest, AdaptiveTable) {
  Options options = CurrentOptions();

  // Write some keys using cuckoo table.
@@ -317,17 +343,4 @@ TEST_F(CuckooTableDBTest, AdaptiveTable) {
 }
 }  // namespace rocksdb

-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
-
-#else
-#include <stdio.h>
-
-int main(int argc, char** argv) {
-  fprintf(stderr, "SKIPPED as Cuckoo table is not supported in ROCKSDB_LITE\n");
-  return 0;
-}
-
-#endif  // ROCKSDB_LITE
+int main(int argc, char** argv) { return rocksdb::test::RunAllTests(); }
@@ -1,548 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#include "port/stack_trace.h"
-#include "util/db_test_util.h"
-
-namespace rocksdb {
-
-static int cfilter_count = 0;
-
-// This is a static filter used for filtering
-// kvs during the compaction process.
-static std::string NEW_VALUE = "NewValue";
-
-class DBTestCompactionFilter : public DBTestBase {
- public:
-  DBTestCompactionFilter() : DBTestBase("/db_compaction_filter_test") {}
-};
-
-class KeepFilter : public CompactionFilter {
- public:
-  virtual bool Filter(int level, const Slice& key, const Slice& value,
-                      std::string* new_value, bool* value_changed) const
-      override {
-    cfilter_count++;
-    return false;
-  }
-
-  virtual const char* Name() const override { return "KeepFilter"; }
-};
-
-class DeleteFilter : public CompactionFilter {
- public:
-  virtual bool Filter(int level, const Slice& key, const Slice& value,
-                      std::string* new_value, bool* value_changed) const
-      override {
-    cfilter_count++;
-    return true;
-  }
-
-  virtual const char* Name() const override { return "DeleteFilter"; }
-};
-
-class DelayFilter : public CompactionFilter {
- public:
-  explicit DelayFilter(DBTestBase* d) : db_test(d) {}
-  virtual bool Filter(int level, const Slice& key, const Slice& value,
-                      std::string* new_value,
-                      bool* value_changed) const override {
-    db_test->env_->addon_time_.fetch_add(1000);
-    return true;
-  }
-
-  virtual const char* Name() const override { return "DelayFilter"; }
-
- private:
-  DBTestBase* db_test;
-};
-
-class ConditionalFilter : public CompactionFilter {
- public:
-  explicit ConditionalFilter(const std::string* filtered_value)
-      : filtered_value_(filtered_value) {}
-  virtual bool Filter(int level, const Slice& key, const Slice& value,
-                      std::string* new_value,
-                      bool* value_changed) const override {
-    return value.ToString() == *filtered_value_;
-  }
-
-  virtual const char* Name() const override { return "ConditionalFilter"; }
-
- private:
-  const std::string* filtered_value_;
-};
-
-class ChangeFilter : public CompactionFilter {
- public:
-  explicit ChangeFilter() {}
-
-  virtual bool Filter(int level, const Slice& key, const Slice& value,
-                      std::string* new_value, bool* value_changed) const
-      override {
-    assert(new_value != nullptr);
-    *new_value = NEW_VALUE;
-    *value_changed = true;
-    return false;
-  }
-
-  virtual const char* Name() const override { return "ChangeFilter"; }
-};
-
-class KeepFilterFactory : public CompactionFilterFactory {
- public:
-  explicit KeepFilterFactory(bool check_context = false)
-      : check_context_(check_context) {}
-
-  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& context) override {
-    if (check_context_) {
-      EXPECT_EQ(expect_full_compaction_.load(), context.is_full_compaction);
-      EXPECT_EQ(expect_manual_compaction_.load(), context.is_manual_compaction);
-    }
-    return std::unique_ptr<CompactionFilter>(new KeepFilter());
-  }
-
-  virtual const char* Name() const override { return "KeepFilterFactory"; }
-  bool check_context_;
-  std::atomic_bool expect_full_compaction_;
-  std::atomic_bool expect_manual_compaction_;
-};
-
-class DeleteFilterFactory : public CompactionFilterFactory {
- public:
-  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& context) override {
-    if (context.is_manual_compaction) {
-      return std::unique_ptr<CompactionFilter>(new DeleteFilter());
-    } else {
-      return std::unique_ptr<CompactionFilter>(nullptr);
-    }
-  }
-
-  virtual const char* Name() const override { return "DeleteFilterFactory"; }
-};
-
-class DelayFilterFactory : public CompactionFilterFactory {
- public:
-  explicit DelayFilterFactory(DBTestBase* d) : db_test(d) {}
-  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& context) override {
-    return std::unique_ptr<CompactionFilter>(new DelayFilter(db_test));
-  }
-
-  virtual const char* Name() const override { return "DelayFilterFactory"; }
-
- private:
-  DBTestBase* db_test;
-};
-
-class ConditionalFilterFactory : public CompactionFilterFactory {
- public:
-  explicit ConditionalFilterFactory(const Slice& filtered_value)
-      : filtered_value_(filtered_value.ToString()) {}
-
-  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& context) override {
-    return std::unique_ptr<CompactionFilter>(
-        new ConditionalFilter(&filtered_value_));
-  }
-
-  virtual const char* Name() const override {
-    return "ConditionalFilterFactory";
-  }
-
- private:
-  std::string filtered_value_;
-};
-
-class ChangeFilterFactory : public CompactionFilterFactory {
- public:
-  explicit ChangeFilterFactory() {}
-
-  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& context) override {
-    return std::unique_ptr<CompactionFilter>(new ChangeFilter());
-  }
-
-  virtual const char* Name() const override { return "ChangeFilterFactory"; }
-};
-
-TEST_F(DBTestCompactionFilter, CompactionFilter) {
-  Options options = CurrentOptions();
-  options.max_open_files = -1;
-  options.num_levels = 3;
-  options.compaction_filter_factory = std::make_shared<KeepFilterFactory>();
-  options = CurrentOptions(options);
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  // Write 100K keys, these are written to a few files in L0.
-  const std::string value(10, 'x');
-  for (int i = 0; i < 100000; i++) {
-    char key[100];
-    snprintf(key, sizeof(key), "B%010d", i);
-    Put(1, key, value);
-  }
-  ASSERT_OK(Flush(1));
-
-  // Push all files to the highest level L2. Verify that
-  // the compaction is each level invokes the filter for
-  // all the keys in that level.
-  cfilter_count = 0;
-  dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
-  ASSERT_EQ(cfilter_count, 100000);
-  cfilter_count = 0;
-  dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
-  ASSERT_EQ(cfilter_count, 100000);
-
-  ASSERT_EQ(NumTableFilesAtLevel(0, 1), 0);
-  ASSERT_EQ(NumTableFilesAtLevel(1, 1), 0);
-  ASSERT_NE(NumTableFilesAtLevel(2, 1), 0);
-  cfilter_count = 0;
-
-  // All the files are in the lowest level.
-  // Verify that all but the 100001st record
-  // has sequence number zero. The 100001st record
-  // is at the tip of this snapshot and cannot
-  // be zeroed out.
-  int count = 0;
-  int total = 0;
-  Arena arena;
-  {
-    ScopedArenaIterator iter(
-        dbfull()->TEST_NewInternalIterator(&arena, handles_[1]));
-    iter->SeekToFirst();
-    ASSERT_OK(iter->status());
-    while (iter->Valid()) {
-      ParsedInternalKey ikey(Slice(), 0, kTypeValue);
-      ikey.sequence = -1;
-      ASSERT_EQ(ParseInternalKey(iter->key(), &ikey), true);
-      total++;
-      if (ikey.sequence != 0) {
-        count++;
-      }
-      iter->Next();
-    }
-  }
-  ASSERT_EQ(total, 100000);
-  ASSERT_EQ(count, 1);
-
-  // overwrite all the 100K keys once again.
-  for (int i = 0; i < 100000; i++) {
-    char key[100];
-    snprintf(key, sizeof(key), "B%010d", i);
-    ASSERT_OK(Put(1, key, value));
-  }
-  ASSERT_OK(Flush(1));
-
-  // push all files to the highest level L2. This
-  // means that all keys should pass at least once
-  // via the compaction filter
-  cfilter_count = 0;
-  dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
-  ASSERT_EQ(cfilter_count, 100000);
-  cfilter_count = 0;
-  dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
-  ASSERT_EQ(cfilter_count, 100000);
-  ASSERT_EQ(NumTableFilesAtLevel(0, 1), 0);
-  ASSERT_EQ(NumTableFilesAtLevel(1, 1), 0);
-  ASSERT_NE(NumTableFilesAtLevel(2, 1), 0);
-
-  // create a new database with the compaction
-  // filter in such a way that it deletes all keys
-  options.compaction_filter_factory = std::make_shared<DeleteFilterFactory>();
-  options.create_if_missing = true;
-  DestroyAndReopen(options);
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  // write all the keys once again.
-  for (int i = 0; i < 100000; i++) {
-    char key[100];
-    snprintf(key, sizeof(key), "B%010d", i);
-    ASSERT_OK(Put(1, key, value));
-  }
-  ASSERT_OK(Flush(1));
-  ASSERT_NE(NumTableFilesAtLevel(0, 1), 0);
-  ASSERT_EQ(NumTableFilesAtLevel(1, 1), 0);
-  ASSERT_EQ(NumTableFilesAtLevel(2, 1), 0);
-
-  // Push all files to the highest level L2. This
-  // triggers the compaction filter to delete all keys,
-  // verify that at the end of the compaction process,
-  // nothing is left.
-  cfilter_count = 0;
-  dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
-  ASSERT_EQ(cfilter_count, 100000);
-  cfilter_count = 0;
-  dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
-  ASSERT_EQ(cfilter_count, 0);
-  ASSERT_EQ(NumTableFilesAtLevel(0, 1), 0);
-  ASSERT_EQ(NumTableFilesAtLevel(1, 1), 0);
-
-  {
-    // Scan the entire database to ensure that nothing is left
-    std::unique_ptr<Iterator> iter(
-        db_->NewIterator(ReadOptions(), handles_[1]));
-    iter->SeekToFirst();
-    count = 0;
-    while (iter->Valid()) {
-      count++;
-      iter->Next();
-    }
-    ASSERT_EQ(count, 0);
-  }
-
-  // The sequence number of the remaining record
-  // is not zeroed out even though it is at the
-  // level Lmax because this record is at the tip
-  count = 0;
-  {
-    ScopedArenaIterator iter(
-        dbfull()->TEST_NewInternalIterator(&arena, handles_[1]));
-    iter->SeekToFirst();
-    ASSERT_OK(iter->status());
-    while (iter->Valid()) {
-      ParsedInternalKey ikey(Slice(), 0, kTypeValue);
-      ASSERT_EQ(ParseInternalKey(iter->key(), &ikey), true);
-      ASSERT_NE(ikey.sequence, (unsigned)0);
-      count++;
-      iter->Next();
-    }
-    ASSERT_EQ(count, 0);
-  }
-}
-
-// Tests the edge case where compaction does not produce any output -- all
-// entries are deleted. The compaction should create bunch of 'DeleteFile'
-// entries in VersionEdit, but none of the 'AddFile's.
-TEST_F(DBTestCompactionFilter, CompactionFilterDeletesAll) {
-  Options options;
-  options.compaction_filter_factory = std::make_shared<DeleteFilterFactory>();
-  options.disable_auto_compactions = true;
-  options.create_if_missing = true;
-  options = CurrentOptions(options);
-  DestroyAndReopen(options);
-
-  // put some data
-  for (int table = 0; table < 4; ++table) {
-    for (int i = 0; i < 10 + table; ++i) {
-      Put(ToString(table * 100 + i), "val");
-    }
-    Flush();
-  }
-
-  // this will produce empty file (delete compaction filter)
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
-  ASSERT_EQ(0U, CountLiveFiles());
-
-  Reopen(options);
-
-  Iterator* itr = db_->NewIterator(ReadOptions());
-  itr->SeekToFirst();
-  // empty db
-  ASSERT_TRUE(!itr->Valid());
-
-  delete itr;
-}
-
-TEST_F(DBTestCompactionFilter, CompactionFilterWithValueChange) {
-  do {
-    Options options;
-    options.num_levels = 3;
-    options.compaction_filter_factory =
-      std::make_shared<ChangeFilterFactory>();
-    options = CurrentOptions(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // Write 100K+1 keys, these are written to a few files
-    // in L0. We do this so that the current snapshot points
-    // to the 100001 key.The compaction filter is  not invoked
-    // on keys that are visible via a snapshot because we
-    // anyways cannot delete it.
-    const std::string value(10, 'x');
-    for (int i = 0; i < 100001; i++) {
-      char key[100];
-      snprintf(key, sizeof(key), "B%010d", i);
-      Put(1, key, value);
-    }
-
-    // push all files to  lower levels
-    ASSERT_OK(Flush(1));
-    if (option_config_ != kUniversalCompactionMultiLevel) {
-      dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
-      dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
-    } else {
-      dbfull()->CompactRange(CompactRangeOptions(), handles_[1], nullptr,
-                             nullptr);
-    }
-
-    // re-write all data again
-    for (int i = 0; i < 100001; i++) {
-      char key[100];
-      snprintf(key, sizeof(key), "B%010d", i);
-      Put(1, key, value);
-    }
-
-    // push all files to  lower levels. This should
-    // invoke the compaction filter for all 100000 keys.
-    ASSERT_OK(Flush(1));
-    if (option_config_ != kUniversalCompactionMultiLevel) {
-      dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
-      dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
-    } else {
-      dbfull()->CompactRange(CompactRangeOptions(), handles_[1], nullptr,
-                             nullptr);
-    }
-
-    // verify that all keys now have the new value that
-    // was set by the compaction process.
-    for (int i = 0; i < 100001; i++) {
-      char key[100];
-      snprintf(key, sizeof(key), "B%010d", i);
-      std::string newvalue = Get(1, key);
-      ASSERT_EQ(newvalue.compare(NEW_VALUE), 0);
-    }
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestCompactionFilter, CompactionFilterWithMergeOperator) {
-  std::string one, two, three, four;
-  PutFixed64(&one, 1);
-  PutFixed64(&two, 2);
-  PutFixed64(&three, 3);
-  PutFixed64(&four, 4);
-
-  Options options;
-  options = CurrentOptions(options);
-  options.create_if_missing = true;
-  options.merge_operator = MergeOperators::CreateUInt64AddOperator();
-  options.num_levels = 3;
-  // Filter out keys with value is 2.
-  options.compaction_filter_factory =
-      std::make_shared<ConditionalFilterFactory>(two);
-  DestroyAndReopen(options);
-
-  // In the same compaction, a value type needs to be deleted based on
-  // compaction filter, and there is a merge type for the key. compaction
-  // filter result is ignored.
-  ASSERT_OK(db_->Put(WriteOptions(), "foo", two));
-  ASSERT_OK(Flush());
-  ASSERT_OK(db_->Merge(WriteOptions(), "foo", one));
-  ASSERT_OK(Flush());
-  std::string newvalue = Get("foo");
-  ASSERT_EQ(newvalue, three);
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-  newvalue = Get("foo");
-  ASSERT_EQ(newvalue, three);
-
-  // value key can be deleted based on compaction filter, leaving only
-  // merge keys.
-  ASSERT_OK(db_->Put(WriteOptions(), "bar", two));
-  ASSERT_OK(Flush());
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-  newvalue = Get("bar");
-  ASSERT_EQ("NOT_FOUND", newvalue);
-  ASSERT_OK(db_->Merge(WriteOptions(), "bar", two));
-  ASSERT_OK(Flush());
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-  newvalue = Get("bar");
-  ASSERT_EQ(two, two);
-
-  // Compaction filter never applies to merge keys.
-  ASSERT_OK(db_->Put(WriteOptions(), "foobar", one));
-  ASSERT_OK(Flush());
-  ASSERT_OK(db_->Merge(WriteOptions(), "foobar", two));
-  ASSERT_OK(Flush());
-  newvalue = Get("foobar");
-  ASSERT_EQ(newvalue, three);
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-  newvalue = Get("foobar");
-  ASSERT_EQ(newvalue, three);
-
-  // In the same compaction, both of value type and merge type keys need to be
-  // deleted based on compaction filter, and there is a merge type for the key.
-  // For both keys, compaction filter results are ignored.
-  ASSERT_OK(db_->Put(WriteOptions(), "barfoo", two));
-  ASSERT_OK(Flush());
-  ASSERT_OK(db_->Merge(WriteOptions(), "barfoo", two));
-  ASSERT_OK(Flush());
-  newvalue = Get("barfoo");
-  ASSERT_EQ(newvalue, four);
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-  newvalue = Get("barfoo");
-  ASSERT_EQ(newvalue, four);
-}
-
-TEST_F(DBTestCompactionFilter, CompactionFilterContextManual) {
-  KeepFilterFactory* filter = new KeepFilterFactory();
-
-  Options options = CurrentOptions();
-  options.compaction_style = kCompactionStyleUniversal;
-  options.compaction_filter_factory.reset(filter);
-  options.compression = kNoCompression;
-  options.level0_file_num_compaction_trigger = 8;
-  Reopen(options);
-  int num_keys_per_file = 400;
-  for (int j = 0; j < 3; j++) {
-    // Write several keys.
-    const std::string value(10, 'x');
-    for (int i = 0; i < num_keys_per_file; i++) {
-      char key[100];
-      snprintf(key, sizeof(key), "B%08d%02d", i, j);
-      Put(key, value);
-    }
-    dbfull()->TEST_FlushMemTable();
-    // Make sure next file is much smaller so automatic compaction will not
-    // be triggered.
-    num_keys_per_file /= 2;
-  }
-
-  // Force a manual compaction
-  cfilter_count = 0;
-  filter->expect_manual_compaction_.store(true);
-  filter->expect_full_compaction_.store(false);  // Manual compaction always
-                                                 // set this flag.
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-  ASSERT_EQ(cfilter_count, 700);
-  ASSERT_EQ(NumSortedRuns(0), 1);
-
-  // Verify total number of keys is correct after manual compaction.
-  {
-    int count = 0;
-    int total = 0;
-    Arena arena;
-    ScopedArenaIterator iter(dbfull()->TEST_NewInternalIterator(&arena));
-    iter->SeekToFirst();
-    ASSERT_OK(iter->status());
-    while (iter->Valid()) {
-      ParsedInternalKey ikey(Slice(), 0, kTypeValue);
-      ikey.sequence = -1;
-      ASSERT_EQ(ParseInternalKey(iter->key(), &ikey), true);
-      total++;
-      if (ikey.sequence != 0) {
-        count++;
-      }
-      iter->Next();
-    }
-    ASSERT_EQ(total, 700);
-    ASSERT_EQ(count, 1);
-  }
-}
-
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-#if !(defined NDEBUG) || !defined(OS_WIN)
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-#else
-  return 0;
-#endif
-}
@@ -1,497 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-// Introduction of SyncPoint effectively disabled building and running this test
-// in Release build.
-// which is a pity, it is a good test
-#if !(defined NDEBUG) || !defined(OS_WIN)
-
-#include "port/stack_trace.h"
-#include "util/db_test_util.h"
-
-namespace rocksdb {
-class DBTestDynamicLevel : public DBTestBase {
- public:
-  DBTestDynamicLevel() : DBTestBase("/db_dynamic_level_test") {}
-};
-
-TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBase) {
-  if (!Snappy_Supported() || !LZ4_Supported()) {
-    return;
-  }
-  // Use InMemoryEnv, or it would be too slow.
-  unique_ptr<Env> env(new MockEnv(env_));
-
-  const int kNKeys = 1000;
-  int keys[kNKeys];
-
-  auto verify_func = [&]() {
-    for (int i = 0; i < kNKeys; i++) {
-      ASSERT_NE("NOT_FOUND", Get(Key(i)));
-      ASSERT_NE("NOT_FOUND", Get(Key(kNKeys * 2 + i)));
-      if (i < kNKeys / 10) {
-        ASSERT_EQ("NOT_FOUND", Get(Key(kNKeys + keys[i])));
-      } else {
-        ASSERT_NE("NOT_FOUND", Get(Key(kNKeys + keys[i])));
-      }
-    }
-  };
-
-  Random rnd(301);
-  for (int ordered_insert = 0; ordered_insert <= 1; ordered_insert++) {
-    for (int i = 0; i < kNKeys; i++) {
-      keys[i] = i;
-    }
-    if (ordered_insert == 0) {
-      std::random_shuffle(std::begin(keys), std::end(keys));
-    }
-    for (int max_background_compactions = 1; max_background_compactions < 4;
-         max_background_compactions += 2) {
-      Options options;
-      options.env = env.get();
-      options.create_if_missing = true;
-      options.db_write_buffer_size = 2048;
-      options.write_buffer_size = 2048;
-      options.max_write_buffer_number = 2;
-      options.level0_file_num_compaction_trigger = 2;
-      options.level0_slowdown_writes_trigger = 2;
-      options.level0_stop_writes_trigger = 2;
-      options.target_file_size_base = 2048;
-      options.level_compaction_dynamic_level_bytes = true;
-      options.max_bytes_for_level_base = 10240;
-      options.max_bytes_for_level_multiplier = 4;
-      options.soft_rate_limit = 1.1;
-      options.max_background_compactions = max_background_compactions;
-      options.num_levels = 5;
-
-      options.compression_per_level.resize(3);
-      options.compression_per_level[0] = kNoCompression;
-      options.compression_per_level[1] = kLZ4Compression;
-      options.compression_per_level[2] = kSnappyCompression;
-
-      DestroyAndReopen(options);
-
-      for (int i = 0; i < kNKeys; i++) {
-        int key = keys[i];
-        ASSERT_OK(Put(Key(kNKeys + key), RandomString(&rnd, 102)));
-        ASSERT_OK(Put(Key(key), RandomString(&rnd, 102)));
-        ASSERT_OK(Put(Key(kNKeys * 2 + key), RandomString(&rnd, 102)));
-        ASSERT_OK(Delete(Key(kNKeys + keys[i / 10])));
-        env_->SleepForMicroseconds(5000);
-      }
-
-      uint64_t int_prop;
-      ASSERT_TRUE(db_->GetIntProperty("rocksdb.background-errors", &int_prop));
-      ASSERT_EQ(0U, int_prop);
-
-      // Verify DB
-      for (int j = 0; j < 2; j++) {
-        verify_func();
-        if (j == 0) {
-          Reopen(options);
-        }
-      }
-
-      // Test compact range works
-      dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-      // All data should be in the last level.
-      ColumnFamilyMetaData cf_meta;
-      db_->GetColumnFamilyMetaData(&cf_meta);
-      ASSERT_EQ(5U, cf_meta.levels.size());
-      for (int i = 0; i < 4; i++) {
-        ASSERT_EQ(0U, cf_meta.levels[i].files.size());
-      }
-      ASSERT_GT(cf_meta.levels[4U].files.size(), 0U);
-      verify_func();
-
-      Close();
-    }
-  }
-
-  env_->SetBackgroundThreads(1, Env::LOW);
-  env_->SetBackgroundThreads(1, Env::HIGH);
-}
-
-// Test specific cases in dynamic max bytes
-TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBase2) {
-  Random rnd(301);
-  int kMaxKey = 1000000;
-
-  Options options = CurrentOptions();
-  options.create_if_missing = true;
-  options.db_write_buffer_size = 2048;
-  options.write_buffer_size = 2048;
-  options.max_write_buffer_number = 2;
-  options.level0_file_num_compaction_trigger = 2;
-  options.level0_slowdown_writes_trigger = 9999;
-  options.level0_stop_writes_trigger = 9999;
-  options.target_file_size_base = 2048;
-  options.level_compaction_dynamic_level_bytes = true;
-  options.max_bytes_for_level_base = 10240;
-  options.max_bytes_for_level_multiplier = 4;
-  options.max_background_compactions = 2;
-  options.num_levels = 5;
-  options.expanded_compaction_factor = 0;  // Force not expanding in compactions
-  BlockBasedTableOptions table_options;
-  table_options.block_size = 1024;
-  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
-
-  DestroyAndReopen(options);
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "true"},
-  }));
-
-  uint64_t int_prop;
-  std::string str_prop;
-
-  // Initial base level is the last level
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(4U, int_prop);
-
-  // Put about 7K to L0
-  for (int i = 0; i < 70; i++) {
-    ASSERT_OK(Put(Key(static_cast<int>(rnd.Uniform(kMaxKey))),
-                  RandomString(&rnd, 80)));
-  }
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "false"},
-  }));
-  Flush();
-  dbfull()->TEST_WaitForCompact();
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(4U, int_prop);
-
-  // Insert extra about 3.5K to L0. After they are compacted to L4, base level
-  // should be changed to L3.
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "true"},
-  }));
-  for (int i = 0; i < 70; i++) {
-    ASSERT_OK(Put(Key(static_cast<int>(rnd.Uniform(kMaxKey))),
-                  RandomString(&rnd, 80)));
-  }
-
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "false"},
-  }));
-  Flush();
-  dbfull()->TEST_WaitForCompact();
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(3U, int_prop);
-  ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level1", &str_prop));
-  ASSERT_EQ("0", str_prop);
-  ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level2", &str_prop));
-  ASSERT_EQ("0", str_prop);
-
-  // Trigger parallel compaction, and the first one would change the base
-  // level.
-  // Hold compaction jobs to make sure
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "CompactionJob::Run():Start",
-      [&](void* arg) { env_->SleepForMicroseconds(100000); });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "true"},
-  }));
-  // Write about 10K more
-  for (int i = 0; i < 100; i++) {
-    ASSERT_OK(Put(Key(static_cast<int>(rnd.Uniform(kMaxKey))),
-                  RandomString(&rnd, 80)));
-  }
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "false"},
-  }));
-  Flush();
-  // Wait for 200 milliseconds before proceeding compactions to make sure two
-  // parallel ones are executed.
-  env_->SleepForMicroseconds(200000);
-  dbfull()->TEST_WaitForCompact();
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(3U, int_prop);
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-
-  // Trigger a condition that the compaction changes base level and L0->Lbase
-  // happens at the same time.
-  // We try to make last levels' targets to be 10K, 40K, 160K, add triggers
-  // another compaction from 40K->160K.
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "true"},
-  }));
-  // Write about 150K more
-  for (int i = 0; i < 1350; i++) {
-    ASSERT_OK(Put(Key(static_cast<int>(rnd.Uniform(kMaxKey))),
-                  RandomString(&rnd, 80)));
-  }
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "false"},
-  }));
-  Flush();
-  dbfull()->TEST_WaitForCompact();
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(2U, int_prop);
-
-  // Keep Writing data until base level changed 2->1. There will be L0->L2
-  // compaction going on at the same time.
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  for (int attempt = 0; attempt <= 20; attempt++) {
-    // Write about 5K more data with two flushes. It should be flush to level 2
-    // but when it is applied, base level is already 1.
-    for (int i = 0; i < 50; i++) {
-      ASSERT_OK(Put(Key(static_cast<int>(rnd.Uniform(kMaxKey))),
-                    RandomString(&rnd, 80)));
-    }
-    Flush();
-
-    ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-    if (int_prop == 2U) {
-      env_->SleepForMicroseconds(50000);
-    } else {
-      break;
-    }
-  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
-
-  env_->SleepForMicroseconds(200000);
-
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(1U, int_prop);
-}
-
-// Test specific cases in dynamic max bytes
-TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesCompactRange) {
-  Random rnd(301);
-  int kMaxKey = 1000000;
-
-  Options options = CurrentOptions();
-  options.create_if_missing = true;
-  options.db_write_buffer_size = 2048;
-  options.write_buffer_size = 2048;
-  options.max_write_buffer_number = 2;
-  options.level0_file_num_compaction_trigger = 2;
-  options.level0_slowdown_writes_trigger = 9999;
-  options.level0_stop_writes_trigger = 9999;
-  options.target_file_size_base = 2;
-  options.level_compaction_dynamic_level_bytes = true;
-  options.max_bytes_for_level_base = 10240;
-  options.max_bytes_for_level_multiplier = 4;
-  options.max_background_compactions = 1;
-  const int kNumLevels = 5;
-  options.num_levels = kNumLevels;
-  options.expanded_compaction_factor = 0;  // Force not expanding in compactions
-  BlockBasedTableOptions table_options;
-  table_options.block_size = 1024;
-  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
-
-  DestroyAndReopen(options);
-
-  // Compact against empty DB
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-
-  uint64_t int_prop;
-  std::string str_prop;
-
-  // Initial base level is the last level
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(4U, int_prop);
-
-  // Put about 7K to L0
-  for (int i = 0; i < 140; i++) {
-    ASSERT_OK(Put(Key(static_cast<int>(rnd.Uniform(kMaxKey))),
-                  RandomString(&rnd, 80)));
-  }
-  Flush();
-  dbfull()->TEST_WaitForCompact();
-  if (NumTableFilesAtLevel(0) == 0) {
-    // Make sure level 0 is not empty
-    ASSERT_OK(Put(Key(static_cast<int>(rnd.Uniform(kMaxKey))),
-                  RandomString(&rnd, 80)));
-    Flush();
-  }
-
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(3U, int_prop);
-  ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level1", &str_prop));
-  ASSERT_EQ("0", str_prop);
-  ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level2", &str_prop));
-  ASSERT_EQ("0", str_prop);
-
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
-
-  std::set<int> output_levels;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "CompactionPicker::CompactRange:Return", [&](void* arg) {
-        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
-        output_levels.insert(compaction->output_level());
-      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-  ASSERT_EQ(output_levels.size(), 2);
-  ASSERT_TRUE(output_levels.find(3) != output_levels.end());
-  ASSERT_TRUE(output_levels.find(4) != output_levels.end());
-  ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level0", &str_prop));
-  ASSERT_EQ("0", str_prop);
-  ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level3", &str_prop));
-  ASSERT_EQ("0", str_prop);
-  // Base level is still level 3.
-  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
-  ASSERT_EQ(3U, int_prop);
-}
-
-TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBaseInc) {
-  Options options = CurrentOptions();
-  options.create_if_missing = true;
-  options.db_write_buffer_size = 2048;
-  options.write_buffer_size = 2048;
-  options.max_write_buffer_number = 2;
-  options.level0_file_num_compaction_trigger = 2;
-  options.level0_slowdown_writes_trigger = 2;
-  options.level0_stop_writes_trigger = 2;
-  options.target_file_size_base = 2048;
-  options.level_compaction_dynamic_level_bytes = true;
-  options.max_bytes_for_level_base = 10240;
-  options.max_bytes_for_level_multiplier = 4;
-  options.soft_rate_limit = 1.1;
-  options.max_background_compactions = 2;
-  options.num_levels = 5;
-
-  DestroyAndReopen(options);
-
-  int non_trivial = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "DBImpl::BackgroundCompaction:NonTrivial",
-      [&](void* arg) { non_trivial++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-  Random rnd(301);
-  const int total_keys = 3000;
-  const int random_part_size = 100;
-  for (int i = 0; i < total_keys; i++) {
-    std::string value = RandomString(&rnd, random_part_size);
-    PutFixed32(&value, static_cast<uint32_t>(i));
-    ASSERT_OK(Put(Key(i), value));
-  }
-  Flush();
-  dbfull()->TEST_WaitForCompact();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-
-  ASSERT_EQ(non_trivial, 0);
-
-  for (int i = 0; i < total_keys; i++) {
-    std::string value = Get(Key(i));
-    ASSERT_EQ(DecodeFixed32(value.c_str() + random_part_size),
-              static_cast<uint32_t>(i));
-  }
-
-  env_->SetBackgroundThreads(1, Env::LOW);
-  env_->SetBackgroundThreads(1, Env::HIGH);
-}
-
-TEST_F(DBTestDynamicLevel, MigrateToDynamicLevelMaxBytesBase) {
-  Random rnd(301);
-  const int kMaxKey = 2000;
-
-  Options options;
-  options.create_if_missing = true;
-  options.db_write_buffer_size = 2048;
-  options.write_buffer_size = 2048;
-  options.max_write_buffer_number = 8;
-  options.level0_file_num_compaction_trigger = 4;
-  options.level0_slowdown_writes_trigger = 4;
-  options.level0_stop_writes_trigger = 8;
-  options.target_file_size_base = 2048;
-  options.level_compaction_dynamic_level_bytes = false;
-  options.max_bytes_for_level_base = 10240;
-  options.max_bytes_for_level_multiplier = 4;
-  options.soft_rate_limit = 1.1;
-  options.num_levels = 8;
-
-  DestroyAndReopen(options);
-
-  auto verify_func = [&](int num_keys, bool if_sleep) {
-    for (int i = 0; i < num_keys; i++) {
-      ASSERT_NE("NOT_FOUND", Get(Key(kMaxKey + i)));
-      if (i < num_keys / 10) {
-        ASSERT_EQ("NOT_FOUND", Get(Key(i)));
-      } else {
-        ASSERT_NE("NOT_FOUND", Get(Key(i)));
-      }
-      if (if_sleep && i % 1000 == 0) {
-        // Without it, valgrind may choose not to give another
-        // thread a chance to run before finishing the function,
-        // causing the test to be extremely slow.
-        env_->SleepForMicroseconds(1);
-      }
-    }
-  };
-
-  int total_keys = 1000;
-  for (int i = 0; i < total_keys; i++) {
-    ASSERT_OK(Put(Key(i), RandomString(&rnd, 102)));
-    ASSERT_OK(Put(Key(kMaxKey + i), RandomString(&rnd, 102)));
-    ASSERT_OK(Delete(Key(i / 10)));
-  }
-  verify_func(total_keys, false);
-  dbfull()->TEST_WaitForCompact();
-
-  options.level_compaction_dynamic_level_bytes = true;
-  options.disable_auto_compactions = true;
-  Reopen(options);
-  verify_func(total_keys, false);
-
-  std::atomic_bool compaction_finished;
-  compaction_finished = false;
-  // Issue manual compaction in one thread and still verify DB state
-  // in main thread.
-  std::thread t([&]() {
-    CompactRangeOptions compact_options;
-    compact_options.change_level = true;
-    compact_options.target_level = options.num_levels - 1;
-    dbfull()->CompactRange(compact_options, nullptr, nullptr);
-    compaction_finished.store(true);
-  });
-  do {
-    verify_func(total_keys, true);
-  } while (!compaction_finished.load());
-  t.join();
-
-  ASSERT_OK(dbfull()->SetOptions({
-      {"disable_auto_compactions", "false"},
-  }));
-
-  int total_keys2 = 2000;
-  for (int i = total_keys; i < total_keys2; i++) {
-    ASSERT_OK(Put(Key(i), RandomString(&rnd, 102)));
-    ASSERT_OK(Put(Key(kMaxKey + i), RandomString(&rnd, 102)));
-    ASSERT_OK(Delete(Key(i / 10)));
-  }
-
-  verify_func(total_keys2, false);
-  dbfull()->TEST_WaitForCompact();
-  verify_func(total_keys2, false);
-
-  // Base level is not level 1
-  ASSERT_EQ(NumTableFilesAtLevel(1), 0);
-  ASSERT_EQ(NumTableFilesAtLevel(2), 0);
-}
-}  // namespace rocksdb
-
-#endif  // !(defined NDEBUG) || !defined(OS_WIN)
-
-int main(int argc, char** argv) {
-#if !(defined NDEBUG) || !defined(OS_WIN)
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-#else
-  return 0;
-#endif
-}
@@ -19,19 +19,17 @@
 #include <stdint.h>
 #include "db/db_impl.h"
 #include "db/filename.h"
-#include "db/job_context.h"
 #include "db/version_set.h"
 #include "rocksdb/db.h"
 #include "rocksdb/env.h"
 #include "port/port.h"
 #include "util/mutexlock.h"
 #include "util/sync_point.h"
-#include "util/file_util.h"

 namespace rocksdb {

 Status DBImpl::DisableFileDeletions() {
-  InstrumentedMutexLock l(&mutex_);
+  MutexLock l(&mutex_);
  ++disable_delete_obsolete_files_;
  if (disable_delete_obsolete_files_ == 1) {
    Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
@@ -45,12 +43,10 @@ Status DBImpl::DisableFileDeletions() {
 }

 Status DBImpl::EnableFileDeletions(bool force) {
-  // Job id == 0 means that this is not our background process, but rather
-  // user thread
-  JobContext job_context(0);
+  JobContext job_context;
  bool should_purge_files = false;
  {
-    InstrumentedMutexLock l(&mutex_);
+    MutexLock l(&mutex_);
    if (force) {
      // if force, we need to enable file deletions right away
      disable_delete_obsolete_files_ = 0;
@@ -71,7 +67,6 @@ Status DBImpl::EnableFileDeletions(bool force) {
  if (should_purge_files)  {
    PurgeObsoleteFiles(job_context);
  }
-  job_context.Clean();
  LogFlush(db_options_.info_log);
  return Status::OK();
 }
@@ -92,14 +87,9 @@ Status DBImpl::GetLiveFiles(std::vector<std::string>& ret,
    // flush all dirty data to disk.
    Status status;
    for (auto cfd : *versions_->GetColumnFamilySet()) {
-      if (cfd->IsDropped()) {
-        continue;
-      }
      cfd->Ref();
      mutex_.Unlock();
      status = FlushMemTable(cfd, FlushOptions());
-      TEST_SYNC_POINT("DBImpl::GetLiveFiles:1");
-      TEST_SYNC_POINT("DBImpl::GetLiveFiles:2");
      mutex_.Lock();
      cfd->Unref();
      if (!status.ok()) {
@@ -119,9 +109,6 @@ Status DBImpl::GetLiveFiles(std::vector<std::string>& ret,
  // Make a set of all of the live *.sst files
  std::vector<FileDescriptor> live;
  for (auto cfd : *versions_->GetColumnFamilySet()) {
-    if (cfd->IsDropped()) {
-      continue;
-    }
    cfd->current()->AddLiveFiles(&live);
  }

@@ -147,7 +134,6 @@ Status DBImpl::GetLiveFiles(std::vector<std::string>& ret,
 Status DBImpl::GetSortedWalFiles(VectorLogPtr& files) {
  return wal_manager_.GetSortedWalFiles(files);
 }
-
 }

 #endif  // ROCKSDB_LITE
@@ -12,9 +12,7 @@
 #include <deque>
 #include <limits>
 #include <set>
-#include <list>
 #include <utility>
-#include <list>
 #include <vector>
 #include <string>

@@ -22,11 +20,8 @@
 #include "db/log_writer.h"
 #include "db/snapshot.h"
 #include "db/column_family.h"
-#include "db/compaction_job.h"
-#include "db/flush_job.h"
 #include "db/version_edit.h"
 #include "db/wal_manager.h"
-#include "db/writebuffer.h"
 #include "memtable_list.h"
 #include "port/port.h"
 #include "rocksdb/db.h"
@@ -34,17 +29,14 @@
 #include "rocksdb/memtablerep.h"
 #include "rocksdb/transaction_log.h"
 #include "util/autovector.h"
-#include "util/event_logger.h"
-#include "util/hash.h"
 #include "util/stop_watch.h"
 #include "util/thread_local.h"
 #include "util/scoped_arena_iterator.h"
-#include "util/hash.h"
-#include "util/instrumented_mutex.h"
 #include "db/internal_stats.h"
 #include "db/write_controller.h"
 #include "db/flush_scheduler.h"
 #include "db/write_thread.h"
+#include "db/job_context.h"

 namespace rocksdb {

@@ -55,8 +47,6 @@ class VersionEdit;
 class VersionSet;
 class CompactionFilterV2;
 class Arena;
-class WriteCallback;
-struct JobContext;

 class DBImpl : public DB {
 public:
@@ -67,34 +57,30 @@ class DBImpl : public DB {
  using DB::Put;
  virtual Status Put(const WriteOptions& options,
                     ColumnFamilyHandle* column_family, const Slice& key,
-                     const Slice& value) override;
+                     const Slice& value);
  using DB::Merge;
  virtual Status Merge(const WriteOptions& options,
                       ColumnFamilyHandle* column_family, const Slice& key,
-                       const Slice& value) override;
+                       const Slice& value);
  using DB::Delete;
  virtual Status Delete(const WriteOptions& options,
-                        ColumnFamilyHandle* column_family,
-                        const Slice& key) override;
+                        ColumnFamilyHandle* column_family, const Slice& key);
  using DB::Write;
-  virtual Status Write(const WriteOptions& options,
-                       WriteBatch* updates) override;
-
+  virtual Status Write(const WriteOptions& options, WriteBatch* updates);
  using DB::Get;
  virtual Status Get(const ReadOptions& options,
                     ColumnFamilyHandle* column_family, const Slice& key,
-                     std::string* value) override;
+                     std::string* value);
  using DB::MultiGet;
  virtual std::vector<Status> MultiGet(
      const ReadOptions& options,
      const std::vector<ColumnFamilyHandle*>& column_family,
-      const std::vector<Slice>& keys,
-      std::vector<std::string>* values) override;
+      const std::vector<Slice>& keys, std::vector<std::string>* values);

  virtual Status CreateColumnFamily(const ColumnFamilyOptions& options,
                                    const std::string& column_family,
-                                    ColumnFamilyHandle** handle) override;
-  virtual Status DropColumnFamily(ColumnFamilyHandle* column_family) override;
+                                    ColumnFamilyHandle** handle);
+  virtual Status DropColumnFamily(ColumnFamilyHandle* column_family);

  // Returns false if key doesn't exist in the database and true if it may.
  // If value_found is not passed in as null, then return the value if found in
@@ -103,138 +89,79 @@ class DBImpl : public DB {
  using DB::KeyMayExist;
  virtual bool KeyMayExist(const ReadOptions& options,
                           ColumnFamilyHandle* column_family, const Slice& key,
-                           std::string* value,
-                           bool* value_found = nullptr) override;
+                           std::string* value, bool* value_found = nullptr);
  using DB::NewIterator;
  virtual Iterator* NewIterator(const ReadOptions& options,
-                                ColumnFamilyHandle* column_family) override;
+                                ColumnFamilyHandle* column_family);
  virtual Status NewIterators(
      const ReadOptions& options,
      const std::vector<ColumnFamilyHandle*>& column_families,
-      std::vector<Iterator*>* iterators) override;
-  virtual const Snapshot* GetSnapshot() override;
-  virtual void ReleaseSnapshot(const Snapshot* snapshot) override;
+      std::vector<Iterator*>* iterators);
+  virtual const Snapshot* GetSnapshot();
+  virtual void ReleaseSnapshot(const Snapshot* snapshot);
  using DB::GetProperty;
  virtual bool GetProperty(ColumnFamilyHandle* column_family,
-                           const Slice& property, std::string* value) override;
+                           const Slice& property, std::string* value);
  using DB::GetIntProperty;
  virtual bool GetIntProperty(ColumnFamilyHandle* column_family,
                              const Slice& property, uint64_t* value) override;
  using DB::GetApproximateSizes;
  virtual void GetApproximateSizes(ColumnFamilyHandle* column_family,
-                                   const Range* range, int n, uint64_t* sizes,
-                                   bool include_memtable = false) override;
+                                   const Range* range, int n, uint64_t* sizes);
  using DB::CompactRange;
-  virtual Status CompactRange(const CompactRangeOptions& options,
-                              ColumnFamilyHandle* column_family,
-                              const Slice* begin, const Slice* end) override;
-
-  using DB::CompactFiles;
-  virtual Status CompactFiles(const CompactionOptions& compact_options,
-                              ColumnFamilyHandle* column_family,
-                              const std::vector<std::string>& input_file_names,
-                              const int output_level,
-                              const int output_path_id = -1) override;
+  virtual Status CompactRange(ColumnFamilyHandle* column_family,
+                              const Slice* begin, const Slice* end,
+                              bool reduce_level = false, int target_level = -1,
+                              uint32_t target_path_id = 0);

  using DB::SetOptions;
-  Status SetOptions(
-      ColumnFamilyHandle* column_family,
-      const std::unordered_map<std::string, std::string>& options_map) override;
+  Status SetOptions(ColumnFamilyHandle* column_family,
+      const std::unordered_map<std::string, std::string>& options_map);

  using DB::NumberLevels;
-  virtual int NumberLevels(ColumnFamilyHandle* column_family) override;
+  virtual int NumberLevels(ColumnFamilyHandle* column_family);
  using DB::MaxMemCompactionLevel;
-  virtual int MaxMemCompactionLevel(ColumnFamilyHandle* column_family) override;
+  virtual int MaxMemCompactionLevel(ColumnFamilyHandle* column_family);
  using DB::Level0StopWriteTrigger;
-  virtual int Level0StopWriteTrigger(
-      ColumnFamilyHandle* column_family) override;
-  virtual const std::string& GetName() const override;
-  virtual Env* GetEnv() const override;
+  virtual int Level0StopWriteTrigger(ColumnFamilyHandle* column_family);
+  virtual const std::string& GetName() const;
+  virtual Env* GetEnv() const;
  using DB::GetOptions;
-  virtual const Options& GetOptions(
-      ColumnFamilyHandle* column_family) const override;
-  using DB::GetDBOptions;
-  virtual const DBOptions& GetDBOptions() const override;
+  virtual const Options& GetOptions(ColumnFamilyHandle* column_family) const;
  using DB::Flush;
  virtual Status Flush(const FlushOptions& options,
-                       ColumnFamilyHandle* column_family) override;
-  virtual Status SyncWAL() override;
+                       ColumnFamilyHandle* column_family);

-  virtual SequenceNumber GetLatestSequenceNumber() const override;
+  virtual SequenceNumber GetLatestSequenceNumber() const;

 #ifndef ROCKSDB_LITE
-  virtual Status DisableFileDeletions() override;
-  virtual Status EnableFileDeletions(bool force) override;
+  virtual Status DisableFileDeletions();
+  virtual Status EnableFileDeletions(bool force);
  virtual int IsFileDeletionsEnabled() const;
  // All the returned filenames start with "/"
  virtual Status GetLiveFiles(std::vector<std::string>&,
                              uint64_t* manifest_file_size,
-                              bool flush_memtable = true) override;
-  virtual Status GetSortedWalFiles(VectorLogPtr& files) override;
+                              bool flush_memtable = true);
+  virtual Status GetSortedWalFiles(VectorLogPtr& files);

  virtual Status GetUpdatesSince(
      SequenceNumber seq_number, unique_ptr<TransactionLogIterator>* iter,
      const TransactionLogIterator::ReadOptions&
-          read_options = TransactionLogIterator::ReadOptions()) override;
-  virtual Status DeleteFile(std::string name) override;
-
-  virtual void GetLiveFilesMetaData(
-      std::vector<LiveFileMetaData>* metadata) override;
-
-  // Obtains the meta data of the specified column family of the DB.
-  // Status::NotFound() will be returned if the current DB does not have
-  // any column family match the specified name.
-  // TODO(yhchiang): output parameter is placed in the end in this codebase.
-  virtual void GetColumnFamilyMetaData(
-      ColumnFamilyHandle* column_family,
-      ColumnFamilyMetaData* metadata) override;
-
-  // experimental API
-  Status SuggestCompactRange(ColumnFamilyHandle* column_family,
-                             const Slice* begin, const Slice* end);
-
-  Status PromoteL0(ColumnFamilyHandle* column_family, int target_level);
-
-  // Similar to Write() but will call the callback once on the single write
-  // thread to determine whether it is safe to perform the write.
-  virtual Status WriteWithCallback(const WriteOptions& write_options,
-                                   WriteBatch* my_batch,
-                                   WriteCallback* callback);
-
-  // Returns the sequence number that is guaranteed to be smaller than or equal
-  // to the sequence number of any key that could be inserted into the current
-  // memtables. It can then be assumed that any write with a larger(or equal)
-  // sequence number will be present in this memtable or a later memtable.
-  //
-  // If the earliest sequence number could not be determined,
-  // kMaxSequenceNumber will be returned.
-  //
-  // If include_history=true, will also search Memtables in MemTableList
-  // History.
-  SequenceNumber GetEarliestMemTableSequenceNumber(SuperVersion* sv,
-                                                   bool include_history);
-
-  // For a given key, check to see if there are any records for this key
-  // in the memtables, including memtable history.
-
-  // On success, *seq will contain the sequence number for the
-  // latest such change or kMaxSequenceNumber if no records were present.
-  // Returns OK on success, other status on error reading memtables.
-  Status GetLatestSequenceForKeyFromMemtable(SuperVersion* sv, const Slice& key,
-                                             SequenceNumber* seq);
+          read_options = TransactionLogIterator::ReadOptions());
+  virtual Status DeleteFile(std::string name);

+  virtual void GetLiveFilesMetaData(std::vector<LiveFileMetaData>* metadata);
 #endif  // ROCKSDB_LITE

  // checks if all live files exist on file system and that their file sizes
  // match to our in-memory records
  virtual Status CheckConsistency();

-  virtual Status GetDbIdentity(std::string& identity) const override;
+  virtual Status GetDbIdentity(std::string& identity);

  Status RunManualCompaction(ColumnFamilyData* cfd, int input_level,
                             int output_level, uint32_t output_path_id,
-                             const Slice* begin, const Slice* end,
-                             bool disallow_trivial_move = false);
+                             const Slice* begin, const Slice* end);

 #ifndef ROCKSDB_LITE
  // Extra methods (for testing) that are not in the public DB interface
@@ -242,8 +169,7 @@ class DBImpl : public DB {

  // Compact any files in the named level that overlap [*begin, *end]
  Status TEST_CompactRange(int level, const Slice* begin, const Slice* end,
-                           ColumnFamilyHandle* column_family = nullptr,
-                           bool disallow_trivial_move = false);
+                           ColumnFamilyHandle* column_family = nullptr);

  // Force current memtable contents to be flushed.
  Status TEST_FlushMemTable(bool wait = true);
@@ -284,16 +210,7 @@ class DBImpl : public DB {
  // REQUIRES: mutex locked
  // pass the pointer that you got from TEST_BeginWrite()
  void TEST_EndWrite(void* w);
-
-  uint64_t TEST_MaxTotalInMemoryState() const {
-    return max_total_in_memory_state_;
-  }
-
-  size_t TEST_LogsToFreeSize();
-
-  uint64_t TEST_LogfileNumber();
-
-#endif  // ROCKSDB_LITE
+#endif  // NDEBUG

  // Returns the list of live files in 'live' and the list
  // of all files in the filesystem in 'candidate_files'.
@@ -309,37 +226,7 @@ class DBImpl : public DB {
  // It is not necessary to hold the mutex when invoking this method.
  void PurgeObsoleteFiles(const JobContext& background_contet);

-  ColumnFamilyHandle* DefaultColumnFamily() const override;
-
-  const SnapshotList& snapshots() const { return snapshots_; }
-
-  void CancelAllBackgroundWork(bool wait);
-
-  // Find Super version and reference it. Based on options, it might return
-  // the thread local cached one.
-  // Call ReturnAndCleanupSuperVersion() when it is no longer needed.
-  SuperVersion* GetAndRefSuperVersion(ColumnFamilyData* cfd);
-
-  // Similar to the previous function but looks up based on a column family id.
-  // nullptr will be returned if this column family no longer exists.
-  // REQUIRED: this function should only be called on the write thread or if the
-  // mutex is held.
-  SuperVersion* GetAndRefSuperVersion(uint32_t column_family_id);
-
-  // Un-reference the super version and return it to thread local cache if
-  // needed. If it is the last reference of the super version. Clean it up
-  // after un-referencing it.
-  void ReturnAndCleanupSuperVersion(ColumnFamilyData* cfd, SuperVersion* sv);
-
-  // Similar to the previous function but looks up based on a column family id.
-  // nullptr will be returned if this column family no longer exists.
-  // REQUIRED: this function should only be called on the write thread.
-  void ReturnAndCleanupSuperVersion(uint32_t colun_family_id, SuperVersion* sv);
-
-  // REQUIRED: this function should only be called on the write thread or if the
-  // mutex is held.  Return value only valid until next call to this function or
-  // mutex is released.
-  ColumnFamilyHandle* GetColumnFamilyHandle(uint32_t column_family_id);
+  ColumnFamilyHandle* DefaultColumnFamily() const;

 protected:
  Env* const env_;
@@ -351,24 +238,6 @@ class DBImpl : public DB {
  Iterator* NewInternalIterator(const ReadOptions&, ColumnFamilyData* cfd,
                                SuperVersion* super_version, Arena* arena);

-  void NotifyOnFlushCompleted(ColumnFamilyData* cfd, FileMetaData* file_meta,
-                              const MutableCFOptions& mutable_cf_options,
-                              int job_id);
-
-  void NotifyOnCompactionCompleted(ColumnFamilyData* cfd,
-                                   Compaction *c, const Status &st,
-                                   const CompactionJobStats& job_stats,
-                                   int job_id);
-
-  void NewThreadStatusCfInfo(ColumnFamilyData* cfd) const;
-
-  void EraseThreadStatusCfInfo(ColumnFamilyData* cfd) const;
-
-  void EraseThreadStatusDbInfo() const;
-
-  Status WriteImpl(const WriteOptions& options, WriteBatch* updates,
-                   WriteCallback* callback);
-
 private:
  friend class DB;
  friend class InternalStats;
@@ -377,9 +246,6 @@ class DBImpl : public DB {
 #endif
  friend struct SuperVersion;
  friend class CompactedDBImpl;
-#ifndef NDEBUG
-  friend class XFTransactionWriteHandler;
-#endif
  struct CompactionState;

  struct WriteContext;
@@ -399,24 +265,6 @@ class DBImpl : public DB {
  // Delete any unneeded files and stale in-memory entries.
  void DeleteObsoleteFiles();

-  // Background process needs to call
-  //     auto x = CaptureCurrentFileNumberInPendingOutputs()
-  //     <do something>
-  //     ReleaseFileNumberFromPendingOutputs(x)
-  // This will protect any temporary files created while <do something> is
-  // executing from being deleted.
-  // -----------
-  // This function will capture current file number and append it to
-  // pending_outputs_. This will prevent any background process to delete any
-  // file created after this point.
-  std::list<uint64_t>::iterator CaptureCurrentFileNumberInPendingOutputs();
-  // This function should be called with the result of
-  // CaptureCurrentFileNumberInPendingOutputs(). It then marks that any file
-  // created between the calls CaptureCurrentFileNumberInPendingOutputs() and
-  // ReleaseFileNumberFromPendingOutputs() can now be deleted (if it's not live
-  // and blocked by any other pending_outputs_ calls)
-  void ReleaseFileNumberFromPendingOutputs(std::list<uint64_t>::iterator v);
-
  // Flush the in-memory write buffer to storage.  Switches to a new
  // log-file/memtable and writes a new descriptor iff successful.
  Status FlushMemTableToOutputFile(ColumnFamilyData* cfd,
@@ -433,16 +281,14 @@ class DBImpl : public DB {
  // database is opened) and is heavyweight because it holds the mutex
  // for the entire period. The second method WriteLevel0Table supports
  // concurrent flush memtables to storage.
-  Status WriteLevel0TableForRecovery(int job_id, ColumnFamilyData* cfd,
-                                     MemTable* mem, VersionEdit* edit);
-
-  // num_bytes: for slowdown case, delay time is calculated based on
-  //            `num_bytes` going through.
-  Status DelayWrite(uint64_t num_bytes);
+  Status WriteLevel0TableForRecovery(ColumnFamilyData* cfd, MemTable* mem,
+                                     VersionEdit* edit);
+  Status DelayWrite(uint64_t expiration_time);

  Status ScheduleFlushes(WriteContext* context);

-  Status SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context);
+  Status SetNewMemtableAndNewLogFile(ColumnFamilyData* cfd,
+                                     WriteContext* context);

  // Force current memtable contents to be flushed.
  Status FlushMemTable(ColumnFamilyData* cfd, const FlushOptions& options);
@@ -453,19 +299,7 @@ class DBImpl : public DB {
  void RecordFlushIOStats();
  void RecordCompactionIOStats();

-#ifndef ROCKSDB_LITE
-  Status CompactFilesImpl(
-      const CompactionOptions& compact_options, ColumnFamilyData* cfd,
-      Version* version, const std::vector<std::string>& input_file_names,
-      const int output_level, int output_path_id, JobContext* job_context,
-      LogBuffer* log_buffer);
-#endif  // ROCKSDB_LITE
-
-  ColumnFamilyData* GetColumnFamilyDataByName(const std::string& cf_name);
-
  void MaybeScheduleFlushOrCompaction();
-  void SchedulePendingFlush(ColumnFamilyData* cfd);
-  void SchedulePendingCompaction(ColumnFamilyData* cfd);
  static void BGWorkCompaction(void* db);
  static void BGWorkFlush(void* db);
  void BackgroundCallCompaction();
@@ -475,11 +309,25 @@ class DBImpl : public DB {
  Status BackgroundFlush(bool* madeProgress, JobContext* job_context,
                         LogBuffer* log_buffer);

+  // This function is called as part of compaction. It enables Flush process to
+  // preempt compaction, since it's higher prioirty
+  uint64_t CallFlushDuringCompaction(ColumnFamilyData* cfd,
+                                     const MutableCFOptions& mutable_cf_options,
+                                     JobContext* job_context,
+                                     LogBuffer* log_buffer);
+
  void PrintStatistics();

  // dump rocksdb.stats to LOG
  void MaybeDumpStats();

+  // Return true if the current db supports snapshot.  If the current
+  // DB does not support snapshot, then calling GetSnapshot() will always
+  // return nullptr.
+  //
+  // @see GetSnapshot()
+  virtual bool IsSnapshotSupported() const;
+
  // Return the minimum empty level that could hold the total data in the
  // input level. Return the input level, if such level could not be found.
  int FindMinimumEmptyLevelFitting(ColumnFamilyData* cfd,
@@ -490,15 +338,6 @@ class DBImpl : public DB {
  // hold the data set.
  Status ReFitLevel(ColumnFamilyData* cfd, int level, int target_level = -1);

-  // helper functions for adding and removing from flush & compaction queues
-  void AddToCompactionQueue(ColumnFamilyData* cfd);
-  ColumnFamilyData* PopFirstFromCompactionQueue();
-  void AddToFlushQueue(ColumnFamilyData* cfd);
-  ColumnFamilyData* PopFirstFromFlushQueue();
-
-  // helper function to call after some of the logs_ were synced
-  void MarkLogsSynced(uint64_t up_to, bool synced_dir, const Status& status);
-
  // table_cache_ provides its own synchronization
  std::shared_ptr<Cache> table_cache_;

@@ -506,7 +345,7 @@ class DBImpl : public DB {
  FileLock* db_lock_;

  // State below is protected by mutex_
-  InstrumentedMutex mutex_;
+  port::Mutex mutex_;
  std::atomic<bool> shutting_down_;
  // This condition variable is signaled on these conditions:
  // * whenever bg_compaction_scheduled_ goes down to 0
@@ -516,54 +355,22 @@ class DBImpl : public DB {
  // * whenever bg_flush_scheduled_ value decreases (i.e. whenever a flush is
  // done, even if it didn't make any progress)
  // * whenever there is an error in background flush or compaction
-  InstrumentedCondVar bg_cv_;
+  port::CondVar bg_cv_;
  uint64_t logfile_number_;
-  bool log_dir_synced_;
+  unique_ptr<log::Writer> log_;
  bool log_empty_;
  ColumnFamilyHandleImpl* default_cf_handle_;
  InternalStats* default_cf_internal_stats_;
  unique_ptr<ColumnFamilyMemTablesImpl> column_family_memtables_;
  struct LogFileNumberSize {
    explicit LogFileNumberSize(uint64_t _number)
-        : number(_number) {}
+        : number(_number), size(0), getting_flushed(false) {}
    void AddSize(uint64_t new_size) { size += new_size; }
    uint64_t number;
-    uint64_t size = 0;
-    bool getting_flushed = false;
-  };
-  struct LogWriterNumber {
-    // pass ownership of _writer
-    LogWriterNumber(uint64_t _number, log::Writer* _writer)
-        : number(_number), writer(_writer) {}
-
-    log::Writer* ReleaseWriter() {
-      auto* w = writer;
-      writer = nullptr;
-      return w;
-    }
-    void ClearWriter() {
-      delete writer;
-      writer = nullptr;
-    }
-
-    uint64_t number;
-    // Visual Studio doesn't support deque's member to be noncopyable because
-    // of a unique_ptr as a member.
-    log::Writer* writer;  // own
-    // true for some prefix of logs_
-    bool getting_synced = false;
+    uint64_t size;
+    bool getting_flushed;
  };
  std::deque<LogFileNumberSize> alive_log_files_;
-  // Log files that aren't fully synced, and the current log file.
-  // Synchronization:
-  //  - push_back() is done from write thread with locked mutex_,
-  //  - pop_front() is done from any thread with locked mutex_,
-  //  - back() and items with getting_synced=true are not popped,
-  //  - it follows that write thread with unlocked mutex_ can safely access
-  //    back() and items with getting_synced=true.
-  std::deque<LogWriterNumber> logs_;
-  // Signaled when getting_synced becomes false for some of the logs_.
-  InstrumentedCondVar log_sync_cv_;
  uint64_t total_log_size_;
  // only used for dynamically adjusting max_total_wal_size. it is a sum of
  // [write_buffer_size * max_write_buffer_number] over all column families
@@ -571,94 +378,26 @@ class DBImpl : public DB {
  // If true, we have only one (default) column family. We use this to optimize
  // some code-paths
  bool single_column_family_mode_;
-  // If this is non-empty, we need to delete these log files in background
-  // threads. Protected by db mutex.
-  autovector<log::Writer*> logs_to_free_;

-  bool is_snapshot_supported_;
-
-  // Class to maintain directories for all database paths other than main one.
-  class Directories {
-   public:
-    Status SetDirectories(Env* env, const std::string& dbname,
-                          const std::string& wal_dir,
-                          const std::vector<DbPath>& data_paths);
-
-    Directory* GetDataDir(size_t path_id);
-
-    Directory* GetWalDir() {
-      if (wal_dir_) {
-        return wal_dir_.get();
-      }
-      return db_dir_.get();
-    }
-
-    Directory* GetDbDir() { return db_dir_.get(); }
-
-   private:
-    std::unique_ptr<Directory> db_dir_;
-    std::vector<std::unique_ptr<Directory>> data_dirs_;
-    std::unique_ptr<Directory> wal_dir_;
-
-    Status CreateAndNewDirectory(Env* env, const std::string& dirname,
-                                 std::unique_ptr<Directory>* directory) const;
-  };
-
-  Directories directories_;
-
-  WriteBuffer write_buffer_;
+  std::unique_ptr<Directory> db_directory_;

  WriteThread write_thread_;

  WriteBatch tmp_batch_;

  WriteController write_controller_;
-
-  // Size of the last batch group. In slowdown mode, next write needs to
-  // sleep if it uses up the quota.
-  uint64_t last_batch_group_size_;
-
  FlushScheduler flush_scheduler_;

  SnapshotList snapshots_;

-  // For each background job, pending_outputs_ keeps the current file number at
-  // the time that background job started.
-  // FindObsoleteFiles()/PurgeObsoleteFiles() never deletes any file that has
-  // number bigger than any of the file number in pending_outputs_. Since file
-  // numbers grow monotonically, this also means that pending_outputs_ is always
-  // sorted. After a background job is done executing, its file number is
-  // deleted from pending_outputs_, which allows PurgeObsoleteFiles() to clean
-  // it up.
-  // State is protected with db mutex.
-  std::list<uint64_t> pending_outputs_;
+  // Set of table files to protect from deletion because they are
+  // part of ongoing compactions.
+  // map from pending file number ID to their path IDs.
+  FileNumToPathIdMap pending_outputs_;

-  // flush_queue_ and compaction_queue_ hold column families that we need to
-  // flush and compact, respectively.
-  // A column family is inserted into flush_queue_ when it satisfies condition
-  // cfd->imm()->IsFlushPending()
-  // A column family is inserted into compaction_queue_ when it satisfied
-  // condition cfd->NeedsCompaction()
-  // Column families in this list are all Ref()-erenced
-  // TODO(icanadi) Provide some kind of ReferencedColumnFamily class that will
-  // do RAII on ColumnFamilyData
-  // Column families are in this queue when they need to be flushed or
-  // compacted. Consumers of these queues are flush and compaction threads. When
-  // column family is put on this queue, we increase unscheduled_flushes_ and
-  // unscheduled_compactions_. When these variables are bigger than zero, that
-  // means we need to schedule background threads for compaction and thread.
-  // Once the background threads are scheduled, we decrease unscheduled_flushes_
-  // and unscheduled_compactions_. That way we keep track of number of
-  // compaction and flush threads we need to schedule. This scheduling is done
-  // in MaybeScheduleFlushOrCompaction()
-  // invariant(column family present in flush_queue_ <==>
-  // ColumnFamilyData::pending_flush_ == true)
-  std::deque<ColumnFamilyData*> flush_queue_;
-  // invariant(column family present in compaction_queue_ <==>
-  // ColumnFamilyData::pending_compaction_ == true)
-  std::deque<ColumnFamilyData*> compaction_queue_;
-  int unscheduled_flushes_;
-  int unscheduled_compactions_;
+  // At least one compaction or flush job is pending but not yet scheduled
+  // because of the max background thread limit.
+  bool bg_schedule_needed_;

  // count how many background compactions are running or have been scheduled
  int bg_compaction_scheduled_;
@@ -679,11 +418,10 @@ class DBImpl : public DB {
    uint32_t output_path_id;
    bool done;
    Status status;
-    bool in_progress;             // compaction request being processed?
-    const InternalKey* begin;     // nullptr means beginning of key range
-    const InternalKey* end;       // nullptr means end of key range
-    InternalKey tmp_storage;      // Used to keep track of compaction progress
-    bool disallow_trivial_move;   // Force actual compaction to run
+    bool in_progress;           // compaction request being processed?
+    const InternalKey* begin;   // nullptr means beginning of key range
+    const InternalKey* end;     // nullptr means end of key range
+    InternalKey tmp_storage;    // Used to keep track of compaction progress
  };
  ManualCompaction* manual_compaction_;

@@ -698,22 +436,15 @@ class DBImpl : public DB {
  // without any synchronization
  int disable_delete_obsolete_files_;

-  // next time when we should run DeleteObsoleteFiles with full scan
-  uint64_t delete_obsolete_files_next_run_;
+  // last time when DeleteObsoleteFiles was invoked
+  uint64_t delete_obsolete_files_last_run_;

  // last time stats were dumped to LOG
  std::atomic<uint64_t> last_stats_dump_time_microsec_;

-  // Each flush or compaction gets its own job id. this counter makes sure
-  // they're unique
-  std::atomic<int> next_job_id_;
-
  bool flush_on_destroy_; // Used when disableWAL is true.

  static const int KEEP_LOG_FILE_NUM = 1000;
-  // MSVC version 1800 still does not have constexpr for ::max()
-  static const uint64_t kNoTimeOut = port::kMaxUint64;
-
  std::string db_absolute_path_;

  // The options to access storage files
@@ -723,9 +454,6 @@ class DBImpl : public DB {
  WalManager wal_manager_;
 #endif  // ROCKSDB_LITE

-  // Unified interface for logging events
-  EventLogger event_logger_;
-
  // A value of true temporarily disables scheduling of background work
  bool bg_work_gate_closed_;

@@ -750,16 +478,23 @@ class DBImpl : public DB {
  // the InstallSuperVersion() function. Background threads carry
  // job_context which can have new_superversion already
  // allocated.
-  void InstallSuperVersionAndScheduleWorkWrapper(
+  void InstallSuperVersionBackground(
      ColumnFamilyData* cfd, JobContext* job_context,
      const MutableCFOptions& mutable_cf_options);

-  // All ColumnFamily state changes go through this function. Here we analyze
-  // the new state and we schedule background work if we detect that the new
-  // state needs flush or compaction.
-  SuperVersion* InstallSuperVersionAndScheduleWork(
-      ColumnFamilyData* cfd, SuperVersion* new_sv,
-      const MutableCFOptions& mutable_cf_options);
+  SuperVersion* InstallSuperVersion(
+    ColumnFamilyData* cfd, SuperVersion* new_sv,
+    const MutableCFOptions& mutable_cf_options);
+
+  // Find Super version and reference it. Based on options, it might return
+  // the thread local cached one.
+  inline SuperVersion* GetAndRefSuperVersion(ColumnFamilyData* cfd);
+
+  // Un-reference the super version and return it to thread local cache if
+  // needed. If it is the last reference of the super version. Clean it up
+  // after un-referencing it.
+  inline void ReturnAndCleanupSuperVersion(ColumnFamilyData* cfd,
+                                           SuperVersion* sv);

 #ifndef ROCKSDB_LITE
  using DB::GetPropertiesOfAllTables;
@@ -793,4 +528,8 @@ static void ClipToRange(T* ptr, V minvalue, V maxvalue) {
  if (static_cast<V>(*ptr) < minvalue) *ptr = minvalue;
 }

+// Dump db file summary, implemented in util/
+extern void DumpDBFileSummary(const DBOptions& options,
+                              const std::string& dbname);
+
 }  // namespace rocksdb
@@ -10,12 +10,11 @@
 #ifndef ROCKSDB_LITE

 #include "db/db_impl.h"
-#include "util/thread_status_updater.h"

 namespace rocksdb {

 uint64_t DBImpl::TEST_GetLevel0TotalSize() {
-  InstrumentedMutexLock l(&mutex_);
+  MutexLock l(&mutex_);
  return default_cf_handle_->cfd()->current()->storage_info()->NumLevelBytes(0);
 }

@@ -45,7 +44,7 @@ int64_t DBImpl::TEST_MaxNextLevelOverlappingBytes(
    auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
    cfd = cfh->cfd();
  }
-  InstrumentedMutexLock l(&mutex_);
+  MutexLock l(&mutex_);
  return cfd->current()->storage_info()->MaxNextLevelOverlappingBytes();
 }

@@ -54,7 +53,7 @@ void DBImpl::TEST_GetFilesMetaData(
    std::vector<std::vector<FileMetaData>>* metadata) {
  auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
  auto cfd = cfh->cfd();
-  InstrumentedMutexLock l(&mutex_);
+  MutexLock l(&mutex_);
  metadata->resize(NumberLevels());
  for (int level = 0; level < NumberLevels(); level++) {
    const std::vector<FileMetaData*>& files =
@@ -73,8 +72,7 @@ uint64_t DBImpl::TEST_Current_Manifest_FileNo() {

 Status DBImpl::TEST_CompactRange(int level, const Slice* begin,
                                 const Slice* end,
-                                 ColumnFamilyHandle* column_family,
-                                 bool disallow_trivial_move) {
+                                 ColumnFamilyHandle* column_family) {
  ColumnFamilyData* cfd;
  if (column_family == nullptr) {
    cfd = default_cf_handle_->cfd();
@@ -83,12 +81,11 @@ Status DBImpl::TEST_CompactRange(int level, const Slice* begin,
    cfd = cfh->cfd();
  }
  int output_level =
-      (cfd->ioptions()->compaction_style == kCompactionStyleUniversal ||
-       cfd->ioptions()->compaction_style == kCompactionStyleFIFO)
+      (cfd->options()->compaction_style == kCompactionStyleUniversal ||
+       cfd->options()->compaction_style == kCompactionStyleFIFO)
          ? level
          : level + 1;
-  return RunManualCompaction(cfd, level, output_level, 0, begin, end,
-                             disallow_trivial_move);
+  return RunManualCompaction(cfd, level, output_level, 0, begin, end);
 }

 Status DBImpl::TEST_FlushMemTable(bool wait) {
@@ -115,7 +112,7 @@ Status DBImpl::TEST_WaitForCompact() {
  // wait for compact. It actually waits for scheduled compaction
  // OR flush to finish.

-  InstrumentedMutexLock l(&mutex_);
+  MutexLock l(&mutex_);
  while ((bg_compaction_scheduled_ || bg_flush_scheduled_) && bg_error_.ok()) {
    bg_cv_.Wait();
  }
@@ -132,8 +129,8 @@ void DBImpl::TEST_UnlockMutex() {

 void* DBImpl::TEST_BeginWrite() {
  auto w = new WriteThread::Writer(&mutex_);
-  write_thread_.EnterWriteThread(w);
-  assert(!w->done);  // Nobody should do our job
+  Status s = write_thread_.EnterWriteThread(w, 0);
+  assert(s.ok() && !w->done);  // No timeout and nobody should do our job
  return reinterpret_cast<void*>(w);
 }

@@ -143,15 +140,5 @@ void DBImpl::TEST_EndWrite(void* w) {
  delete writer;
 }

-size_t DBImpl::TEST_LogsToFreeSize() {
-  InstrumentedMutexLock l(&mutex_);
-  return logs_to_free_.size();
-}
-
-uint64_t DBImpl::TEST_LogfileNumber() {
-  InstrumentedMutexLock l(&mutex_);
-  return logfile_number_;
-}
-
 }  // namespace rocksdb
 #endif  // ROCKSDB_LITE
@@ -1,151 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#include "db/db_impl.h"
-
-#ifndef __STDC_FORMAT_MACROS
-#define __STDC_FORMAT_MACROS
-#endif
-
-#include <inttypes.h>
-#include <vector>
-
-#include "db/column_family.h"
-#include "db/job_context.h"
-#include "db/version_set.h"
-#include "rocksdb/status.h"
-
-namespace rocksdb {
-
-#ifndef ROCKSDB_LITE
-Status DBImpl::SuggestCompactRange(ColumnFamilyHandle* column_family,
-                                   const Slice* begin, const Slice* end) {
-  auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
-  auto cfd = cfh->cfd();
-  InternalKey start_key, end_key;
-  if (begin != nullptr) {
-    start_key.SetMaxPossibleForUserKey(*begin);
-  }
-  if (end != nullptr) {
-    end_key.SetMinPossibleForUserKey(*end);
-  }
-  {
-    InstrumentedMutexLock l(&mutex_);
-    auto vstorage = cfd->current()->storage_info();
-    for (int level = 0; level < vstorage->num_non_empty_levels() - 1; ++level) {
-      std::vector<FileMetaData*> inputs;
-      vstorage->GetOverlappingInputs(
-          level, begin == nullptr ? nullptr : &start_key,
-          end == nullptr ? nullptr : &end_key, &inputs);
-      for (auto f : inputs) {
-        f->marked_for_compaction = true;
-      }
-    }
-    // Since we have some more files to compact, we should also recompute
-    // compaction score
-    vstorage->ComputeCompactionScore(*cfd->GetLatestMutableCFOptions(),
-                                     CompactionOptionsFIFO());
-    SchedulePendingCompaction(cfd);
-    MaybeScheduleFlushOrCompaction();
-  }
-  return Status::OK();
-}
-
-Status DBImpl::PromoteL0(ColumnFamilyHandle* column_family, int target_level) {
-  assert(column_family);
-
-  if (target_level < 1) {
-    Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-        "PromoteL0 FAILED. Invalid target level %d\n", target_level);
-    return Status::InvalidArgument("Invalid target level");
-  }
-
-  Status status;
-  VersionEdit edit;
-  JobContext job_context(next_job_id_.fetch_add(1), true);
-  {
-    InstrumentedMutexLock l(&mutex_);
-    auto* cfd = static_cast<ColumnFamilyHandleImpl*>(column_family)->cfd();
-    const auto* vstorage = cfd->current()->storage_info();
-
-    if (target_level >= vstorage->num_levels()) {
-      Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-          "PromoteL0 FAILED. Target level %d does not exist\n", target_level);
-      job_context.Clean();
-      return Status::InvalidArgument("Target level does not exist");
-    }
-
-    // Sort L0 files by range.
-    const InternalKeyComparator* icmp = &cfd->internal_comparator();
-    auto l0_files = vstorage->LevelFiles(0);
-    std::sort(l0_files.begin(), l0_files.end(),
-              [icmp](FileMetaData* f1, FileMetaData* f2) {
-                return icmp->Compare(f1->largest, f2->largest) < 0;
-              });
-
-    // Check that no L0 file is being compacted and that they have
-    // non-overlapping ranges.
-    for (size_t i = 0; i < l0_files.size(); ++i) {
-      auto f = l0_files[i];
-      if (f->being_compacted) {
-        Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-            "PromoteL0 FAILED. File %" PRIu64 " being compacted\n",
-            f->fd.GetNumber());
-        job_context.Clean();
-        return Status::InvalidArgument("PromoteL0 called during L0 compaction");
-      }
-
-      if (i == 0) continue;
-      auto prev_f = l0_files[i - 1];
-      if (icmp->Compare(prev_f->largest, f->smallest) >= 0) {
-        Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-            "PromoteL0 FAILED. Files %" PRIu64 " and %" PRIu64
-            " have overlapping ranges\n",
-            prev_f->fd.GetNumber(), f->fd.GetNumber());
-        job_context.Clean();
-        return Status::InvalidArgument("L0 has overlapping files");
-      }
-    }
-
-    // Check that all levels up to target_level are empty.
-    for (int level = 1; level <= target_level; ++level) {
-      if (vstorage->NumLevelFiles(level) > 0) {
-        Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-            "PromoteL0 FAILED. Level %d not empty\n", level);
-        job_context.Clean();
-        return Status::InvalidArgument(
-            "All levels up to target_level "
-            "must be empty");
-      }
-    }
-
-    edit.SetColumnFamily(cfd->GetID());
-    for (const auto& f : l0_files) {
-      edit.DeleteFile(0, f->fd.GetNumber());
-      edit.AddFile(target_level, f->fd.GetNumber(), f->fd.GetPathId(),
-                   f->fd.GetFileSize(), f->smallest, f->largest,
-                   f->smallest_seqno, f->largest_seqno,
-                   f->marked_for_compaction);
-    }
-
-    status = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
-                                    &edit, &mutex_, directories_.GetDbDir());
-    if (status.ok()) {
-      InstallSuperVersionAndScheduleWorkWrapper(
-          cfd, &job_context, *cfd->GetLatestMutableCFOptions());
-    }
-  }  // lock released here
-  LogFlush(db_options_.info_log);
-  job_context.Clean();
-
-  return status;
-}
-#endif  // ROCKSDB_LITE
-
-}  // namespace rocksdb
@@ -3,10 +3,8 @@
 //  LICENSE file in the root directory of this source tree. An additional grant
 //  of patent rights can be found in the PATENTS file in the same directory.

-
 #include "db/db_impl_readonly.h"
-
-#include "db/compacted_db_impl.h"
+#include "utilities/compacted_db/compacted_db_impl.h"
 #include "db/db_impl.h"
 #include "db/merge_context.h"
 #include "db/db_iter.h"
@@ -14,8 +12,6 @@

 namespace rocksdb {

-#ifndef ROCKSDB_LITE
-
 DBImplReadOnly::DBImplReadOnly(const DBOptions& db_options,
                               const std::string& dbname)
    : DBImpl(db_options, dbname) {
@@ -100,10 +96,12 @@ Status DB::OpenForReadOnly(const Options& options, const std::string& dbname,

  // Try to first open DB as fully compacted DB
  Status s;
+#ifndef ROCKSDB_LITE
  s = CompactedDBImpl::Open(options, dbname, dbptr);
  if (s.ok()) {
    return s;
  }
+#endif

  DBOptions db_options(options);
  ColumnFamilyOptions cf_options(options);
@@ -154,10 +152,6 @@ Status DB::OpenForReadOnly(
  impl->mutex_.Unlock();
  if (s.ok()) {
    *dbptr = impl;
-    for (auto* h : *handles) {
-      impl->NewThreadStatusCfInfo(
-          reinterpret_cast<ColumnFamilyHandleImpl*>(h)->cfd());
-    }
  } else {
    for (auto h : *handles) {
      delete h;
@@ -168,20 +162,5 @@ Status DB::OpenForReadOnly(
  return s;
 }

-#else  // !ROCKSDB_LITE
-
-Status DB::OpenForReadOnly(const Options& options, const std::string& dbname,
-                           DB** dbptr, bool error_if_log_file_exist) {
-  return Status::NotSupported("Not supported in ROCKSDB_LITE.");
-}
-
-Status DB::OpenForReadOnly(
-    const DBOptions& db_options, const std::string& dbname,
-    const std::vector<ColumnFamilyDescriptor>& column_families,
-    std::vector<ColumnFamilyHandle*>* handles, DB** dbptr,
-    bool error_if_log_file_exist) {
-  return Status::NotSupported("Not supported in ROCKSDB_LITE.");
-}
-#endif  // !ROCKSDB_LITE

 }   // namespace rocksdb
@@ -4,9 +4,6 @@
 //  of patent rights can be found in the PATENTS file in the same directory.

 #pragma once
-
-#ifndef ROCKSDB_LITE
-
 #include "db/db_impl.h"
 #include <vector>
 #include <string>
@@ -58,18 +55,10 @@ class DBImplReadOnly : public DBImpl {
    return Status::NotSupported("Not supported operation in read only mode.");
  }
  using DBImpl::CompactRange;
-  virtual Status CompactRange(const CompactRangeOptions& options,
-                              ColumnFamilyHandle* column_family,
-                              const Slice* begin, const Slice* end) override {
-    return Status::NotSupported("Not supported operation in read only mode.");
-  }
-
-  using DBImpl::CompactFiles;
-  virtual Status CompactFiles(
-      const CompactionOptions& compact_options,
-      ColumnFamilyHandle* column_family,
-      const std::vector<std::string>& input_file_names,
-      const int output_level, const int output_path_id = -1) override {
+  virtual Status CompactRange(ColumnFamilyHandle* column_family,
+                              const Slice* begin, const Slice* end,
+                              bool reduce_level = false, int target_level = -1,
+                              uint32_t target_path_id = 0) override {
    return Status::NotSupported("Not supported operation in read only mode.");
  }

@@ -77,7 +66,6 @@ class DBImplReadOnly : public DBImpl {
  virtual Status DisableFileDeletions() override {
    return Status::NotSupported("Not supported operation in read only mode.");
  }
-
  virtual Status EnableFileDeletions(bool force) override {
    return Status::NotSupported("Not supported operation in read only mode.");
  }
@@ -102,5 +90,3 @@ class DBImplReadOnly : public DBImpl {
  void operator=(const DBImplReadOnly&);
 };
 }
-
-#endif  // !ROCKSDB_LITE
@@ -1,171 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-#include "port/stack_trace.h"
-#include "util/db_test_util.h"
-
-namespace rocksdb {
-
-class DBTestInPlaceUpdate : public DBTestBase {
- public:
-  DBTestInPlaceUpdate() : DBTestBase("/db_inplace_update_test") {}
-};
-
-TEST_F(DBTestInPlaceUpdate, InPlaceUpdate) {
-  do {
-    Options options;
-    options.create_if_missing = true;
-    options.inplace_update_support = true;
-    options.env = env_;
-    options.write_buffer_size = 100000;
-    options = CurrentOptions(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // Update key with values of smaller size
-    int numValues = 10;
-    for (int i = numValues; i > 0; i--) {
-      std::string value = DummyString(i, 'a');
-      ASSERT_OK(Put(1, "key", value));
-      ASSERT_EQ(value, Get(1, "key"));
-    }
-
-    // Only 1 instance for that key.
-    validateNumberOfEntries(1, 1);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestInPlaceUpdate, InPlaceUpdateLargeNewValue) {
-  do {
-    Options options;
-    options.create_if_missing = true;
-    options.inplace_update_support = true;
-    options.env = env_;
-    options.write_buffer_size = 100000;
-    options = CurrentOptions(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // Update key with values of larger size
-    int numValues = 10;
-    for (int i = 0; i < numValues; i++) {
-      std::string value = DummyString(i, 'a');
-      ASSERT_OK(Put(1, "key", value));
-      ASSERT_EQ(value, Get(1, "key"));
-    }
-
-    // All 10 updates exist in the internal iterator
-    validateNumberOfEntries(numValues, 1);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackSmallerSize) {
-  do {
-    Options options;
-    options.create_if_missing = true;
-    options.inplace_update_support = true;
-
-    options.env = env_;
-    options.write_buffer_size = 100000;
-    options.inplace_callback =
-      rocksdb::DBTestInPlaceUpdate::updateInPlaceSmallerSize;
-    options = CurrentOptions(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // Update key with values of smaller size
-    int numValues = 10;
-    ASSERT_OK(Put(1, "key", DummyString(numValues, 'a')));
-    ASSERT_EQ(DummyString(numValues, 'c'), Get(1, "key"));
-
-    for (int i = numValues; i > 0; i--) {
-      ASSERT_OK(Put(1, "key", DummyString(i, 'a')));
-      ASSERT_EQ(DummyString(i - 1, 'b'), Get(1, "key"));
-    }
-
-    // Only 1 instance for that key.
-    validateNumberOfEntries(1, 1);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackSmallerVarintSize) {
-  do {
-    Options options;
-    options.create_if_missing = true;
-    options.inplace_update_support = true;
-
-    options.env = env_;
-    options.write_buffer_size = 100000;
-    options.inplace_callback =
-      rocksdb::DBTestInPlaceUpdate::updateInPlaceSmallerVarintSize;
-    options = CurrentOptions(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // Update key with values of smaller varint size
-    int numValues = 265;
-    ASSERT_OK(Put(1, "key", DummyString(numValues, 'a')));
-    ASSERT_EQ(DummyString(numValues, 'c'), Get(1, "key"));
-
-    for (int i = numValues; i > 0; i--) {
-      ASSERT_OK(Put(1, "key", DummyString(i, 'a')));
-      ASSERT_EQ(DummyString(1, 'b'), Get(1, "key"));
-    }
-
-    // Only 1 instance for that key.
-    validateNumberOfEntries(1, 1);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackLargeNewValue) {
-  do {
-    Options options;
-    options.create_if_missing = true;
-    options.inplace_update_support = true;
-
-    options.env = env_;
-    options.write_buffer_size = 100000;
-    options.inplace_callback =
-      rocksdb::DBTestInPlaceUpdate::updateInPlaceLargerSize;
-    options = CurrentOptions(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // Update key with values of larger size
-    int numValues = 10;
-    for (int i = 0; i < numValues; i++) {
-      ASSERT_OK(Put(1, "key", DummyString(i, 'a')));
-      ASSERT_EQ(DummyString(i, 'c'), Get(1, "key"));
-    }
-
-    // No inplace updates. All updates are puts with new seq number
-    // All 10 updates exist in the internal iterator
-    validateNumberOfEntries(numValues, 1);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackNoAction) {
-  do {
-    Options options;
-    options.create_if_missing = true;
-    options.inplace_update_support = true;
-
-    options.env = env_;
-    options.write_buffer_size = 100000;
-    options.inplace_callback =
-      rocksdb::DBTestInPlaceUpdate::updateInPlaceNoAction;
-    options = CurrentOptions(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-
-    // Callback function requests no actions from db
-    ASSERT_OK(Put(1, "key", DummyString(1, 'a')));
-    ASSERT_EQ(Get(1, "key"), "NOT_FOUND");
-  } while (ChangeCompactOptions());
-}
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -90,17 +90,17 @@ class DBIter: public Iterator {
    assert(iter_ == nullptr);
    iter_ = iter;
  }
-  virtual bool Valid() const override { return valid_; }
-  virtual Slice key() const override {
+  virtual bool Valid() const { return valid_; }
+  virtual Slice key() const {
    assert(valid_);
    return saved_key_.GetKey();
  }
-  virtual Slice value() const override {
+  virtual Slice value() const {
    assert(valid_);
    return (direction_ == kForward && !current_entry_is_merged_) ?
      iter_->value() : saved_value_;
  }
-  virtual Status status() const override {
+  virtual Status status() const {
    if (status_.ok()) {
      return iter_->status();
    } else {
@@ -108,14 +108,13 @@ class DBIter: public Iterator {
    }
  }

-  virtual void Next() override;
-  virtual void Prev() override;
-  virtual void Seek(const Slice& target) override;
-  virtual void SeekToFirst() override;
-  virtual void SeekToLast() override;
+  virtual void Next();
+  virtual void Prev();
+  virtual void Seek(const Slice& target);
+  virtual void SeekToFirst();
+  virtual void SeekToLast();

 private:
-  void ReverseToBackward();
  void PrevInternal();
  void FindParseableKey(ParsedInternalKey* ikey, Direction direction);
  bool FindValueForCurrentKey();
@@ -226,6 +225,7 @@ void DBIter::FindNextUserEntryInternal(bool skipping) {
          num_skipped++;  // skip this entry
          PERF_COUNTER_ADD(internal_key_skipped_count, 1);
        } else {
+          skipping = false;
          switch (ikey.type) {
            case kTypeDeletion:
              // Arrange to skip all upcoming entries for this key since
@@ -255,14 +255,13 @@ void DBIter::FindNextUserEntryInternal(bool skipping) {
    }
    // If we have sequentially iterated via numerous keys and still not
    // found the next user-key, then it is better to seek so that we can
-    // avoid too many key comparisons. We seek to the last occurrence of
-    // our current key by looking for sequence number 0 and type deletion
-    // (the smallest type).
+    // avoid too many key comparisons. We seek to the last occurence of
+    // our current key by looking for sequence number 0.
    if (skipping && num_skipped > max_skip_) {
      num_skipped = 0;
      std::string last_key;
      AppendInternalKey(&last_key, ParsedInternalKey(saved_key_.GetKey(), 0,
-                                                     kTypeDeletion));
+                                                     kValueTypeForSeek));
      iter_->Seek(last_key);
      RecordTick(statistics_, NUMBER_OF_RESEEKS_IN_ITERATION);
    } else {
@@ -282,9 +281,8 @@ void DBIter::MergeValuesNewToOld() {
  if (!user_merge_operator_) {
    Log(InfoLogLevel::ERROR_LEVEL,
        logger_, "Options::merge_operator is null.");
-    status_ = Status::InvalidArgument("user_merge_operator_ must be set.");
-    valid_ = false;
-    return;
+    throw std::logic_error("DBIter::MergeValuesNewToOld() with"
+                           " Options::merge_operator null");
  }

  // Start the merge process by pushing the first operand
@@ -315,14 +313,8 @@ void DBIter::MergeValuesNewToOld() {
      // final result in saved_value_. We are done!
      // ignore corruption if there is any.
      const Slice val = iter_->value();
-      {
-        StopWatchNano timer(env_, statistics_ != nullptr);
-        PERF_TIMER_GUARD(merge_operator_time_nanos);
-        user_merge_operator_->FullMerge(ikey.user_key, &val, operands,
-                                        &saved_value_, logger_);
-        RecordTick(statistics_, MERGE_OPERATION_TOTAL_TIME,
-                   timer.ElapsedNanos());
-      }
+      user_merge_operator_->FullMerge(ikey.user_key, &val, operands,
+                                      &saved_value_, logger_);
      // iter_ is positioned after put
      iter_->Next();
      return;
@@ -336,54 +328,23 @@ void DBIter::MergeValuesNewToOld() {
    }
  }

-  {
-    StopWatchNano timer(env_, statistics_ != nullptr);
-    PERF_TIMER_GUARD(merge_operator_time_nanos);
-    // we either exhausted all internal keys under this user key, or hit
-    // a deletion marker.
-    // feed null as the existing value to the merge operator, such that
-    // client can differentiate this scenario and do things accordingly.
-    user_merge_operator_->FullMerge(saved_key_.GetKey(), nullptr, operands,
-                                    &saved_value_, logger_);
-    RecordTick(statistics_, MERGE_OPERATION_TOTAL_TIME, timer.ElapsedNanos());
-  }
+  // we either exhausted all internal keys under this user key, or hit
+  // a deletion marker.
+  // feed null as the existing value to the merge operator, such that
+  // client can differentiate this scenario and do things accordingly.
+  user_merge_operator_->FullMerge(saved_key_.GetKey(), nullptr, operands,
+                                  &saved_value_, logger_);
 }

 void DBIter::Prev() {
  assert(valid_);
  if (direction_ == kForward) {
-    ReverseToBackward();
+    FindPrevUserKey();
+    direction_ = kReverse;
  }
  PrevInternal();
 }

-void DBIter::ReverseToBackward() {
-  if (current_entry_is_merged_) {
-    // Not placed in the same key. Need to call Prev() until finding the
-    // previous key.
-    if (!iter_->Valid()) {
-      iter_->SeekToLast();
-    }
-    ParsedInternalKey ikey;
-    FindParseableKey(&ikey, kReverse);
-    while (iter_->Valid() &&
-           user_comparator_->Compare(ikey.user_key, saved_key_.GetKey()) > 0) {
-      iter_->Prev();
-      FindParseableKey(&ikey, kReverse);
-    }
-  }
-#ifndef NDEBUG
-  if (iter_->Valid()) {
-    ParsedInternalKey ikey;
-    assert(ParseKey(&ikey));
-    assert(user_comparator_->Compare(ikey.user_key, saved_key_.GetKey()) <= 0);
-  }
-#endif
-
-  FindPrevUserKey();
-  direction_ = kReverse;
-}
-
 void DBIter::PrevInternal() {
  if (!iter_->Valid()) {
    valid_ = false;
@@ -473,24 +434,14 @@ bool DBIter::FindValueForCurrentKey() {
      return false;
    case kTypeMerge:
      if (last_not_merge_type == kTypeDeletion) {
-        StopWatchNano timer(env_, statistics_ != nullptr);
-        PERF_TIMER_GUARD(merge_operator_time_nanos);
        user_merge_operator_->FullMerge(saved_key_.GetKey(), nullptr, operands,
                                        &saved_value_, logger_);
-        RecordTick(statistics_, MERGE_OPERATION_TOTAL_TIME,
-                   timer.ElapsedNanos());
      } else {
        assert(last_not_merge_type == kTypeValue);
        std::string last_put_value = saved_value_;
        Slice temp_slice(last_put_value);
-        {
-          StopWatchNano timer(env_, statistics_ != nullptr);
-          PERF_TIMER_GUARD(merge_operator_time_nanos);
-          user_merge_operator_->FullMerge(saved_key_.GetKey(), &temp_slice,
-                                          operands, &saved_value_, logger_);
-          RecordTick(statistics_, MERGE_OPERATION_TOTAL_TIME,
-                     timer.ElapsedNanos());
-        }
+        user_merge_operator_->FullMerge(saved_key_.GetKey(), &temp_slice,
+                                        operands, &saved_value_, logger_);
      }
      break;
    case kTypeValue:
@@ -541,13 +492,9 @@ bool DBIter::FindValueForCurrentKeyUsingSeek() {
  if (!iter_->Valid() ||
      (user_comparator_->Compare(ikey.user_key, saved_key_.GetKey()) != 0) ||
      ikey.type == kTypeDeletion) {
-    {
-      StopWatchNano timer(env_, statistics_ != nullptr);
-      PERF_TIMER_GUARD(merge_operator_time_nanos);
-      user_merge_operator_->FullMerge(saved_key_.GetKey(), nullptr, operands,
-                                      &saved_value_, logger_);
-      RecordTick(statistics_, MERGE_OPERATION_TOTAL_TIME, timer.ElapsedNanos());
-    }
+    user_merge_operator_->FullMerge(saved_key_.GetKey(), nullptr, operands,
+                                    &saved_value_, logger_);
+
    // Make iter_ valid and point to saved_key_
    if (!iter_->Valid() ||
        (user_comparator_->Compare(ikey.user_key, saved_key_.GetKey()) != 0)) {
@@ -559,13 +506,8 @@ bool DBIter::FindValueForCurrentKeyUsingSeek() {
  }

  const Slice& val = iter_->value();
-  {
-    StopWatchNano timer(env_, statistics_ != nullptr);
-    PERF_TIMER_GUARD(merge_operator_time_nanos);
-    user_merge_operator_->FullMerge(saved_key_.GetKey(), &val, operands,
-                                    &saved_value_, logger_);
-    RecordTick(statistics_, MERGE_OPERATION_TOTAL_TIME, timer.ElapsedNanos());
-  }
+  user_merge_operator_->FullMerge(saved_key_.GetKey(), &val, operands,
+                                  &saved_value_, logger_);
  valid_ = true;
  return true;
 }
@@ -692,28 +634,7 @@ void DBIter::SeekToLast() {
    PERF_TIMER_GUARD(seek_internal_seek_time);
    iter_->SeekToLast();
  }
-  // When the iterate_upper_bound is set to a value,
-  // it will seek to the last key before the
-  // ReadOptions.iterate_upper_bound
-  if (iter_->Valid() && iterate_upper_bound_ != nullptr) {
-    saved_key_.SetKey(*iterate_upper_bound_);
-    std::string last_key;
-    AppendInternalKey(&last_key,
-                      ParsedInternalKey(saved_key_.GetKey(), kMaxSequenceNumber,
-                                        kValueTypeForSeek));

-    iter_->Seek(last_key);
-
-    if (!iter_->Valid()) {
-      iter_->SeekToLast();
-    } else {
-      iter_->Prev();
-      if (!iter_->Valid()) {
-        valid_ = false;
-        return;
-      }
-    }
-  }
  PrevInternal();
 }

@@ -1,290 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-// Introduction of SyncPoint effectively disabled building and running this test
-// in Release build.
-// which is a pity, it is a good test
-#if !(defined NDEBUG) || !defined(OS_WIN)
-
-#include "port/stack_trace.h"
-#include "util/db_test_util.h"
-
-namespace rocksdb {
-
-class DBTestXactLogIterator : public DBTestBase {
- public:
-  DBTestXactLogIterator() : DBTestBase("/db_log_iter_test") {}
-
-  std::unique_ptr<TransactionLogIterator> OpenTransactionLogIter(
-      const SequenceNumber seq) {
-    unique_ptr<TransactionLogIterator> iter;
-    Status status = dbfull()->GetUpdatesSince(seq, &iter);
-    EXPECT_OK(status);
-    EXPECT_TRUE(iter->Valid());
-    return std::move(iter);
-  }
-};
-
-namespace {
-SequenceNumber ReadRecords(
-    std::unique_ptr<TransactionLogIterator>& iter,
-    int& count) {
-  count = 0;
-  SequenceNumber lastSequence = 0;
-  BatchResult res;
-  while (iter->Valid()) {
-    res = iter->GetBatch();
-    EXPECT_TRUE(res.sequence > lastSequence);
-    ++count;
-    lastSequence = res.sequence;
-    EXPECT_OK(iter->status());
-    iter->Next();
-  }
-  return res.sequence;
-}
-
-void ExpectRecords(
-    const int expected_no_records,
-    std::unique_ptr<TransactionLogIterator>& iter) {
-  int num_records;
-  ReadRecords(iter, num_records);
-  ASSERT_EQ(num_records, expected_no_records);
-}
-}  // namespace
-
-TEST_F(DBTestXactLogIterator, TransactionLogIterator) {
-  do {
-    Options options = OptionsForLogIterTest();
-    DestroyAndReopen(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-    Put(0, "key1", DummyString(1024));
-    Put(1, "key2", DummyString(1024));
-    Put(1, "key2", DummyString(1024));
-    ASSERT_EQ(dbfull()->GetLatestSequenceNumber(), 3U);
-    {
-      auto iter = OpenTransactionLogIter(0);
-      ExpectRecords(3, iter);
-    }
-    ReopenWithColumnFamilies({"default", "pikachu"}, options);
-    env_->SleepForMicroseconds(2 * 1000 * 1000);
-    {
-      Put(0, "key4", DummyString(1024));
-      Put(1, "key5", DummyString(1024));
-      Put(0, "key6", DummyString(1024));
-    }
-    {
-      auto iter = OpenTransactionLogIter(0);
-      ExpectRecords(6, iter);
-    }
-  } while (ChangeCompactOptions());
-}
-
-#ifndef NDEBUG  // sync point is not included with DNDEBUG build
-TEST_F(DBTestXactLogIterator, TransactionLogIteratorRace) {
-  static const int LOG_ITERATOR_RACE_TEST_COUNT = 2;
-  static const char* sync_points[LOG_ITERATOR_RACE_TEST_COUNT][4] = {
-      {"WalManager::GetSortedWalFiles:1",  "WalManager::PurgeObsoleteFiles:1",
-       "WalManager::PurgeObsoleteFiles:2", "WalManager::GetSortedWalFiles:2"},
-      {"WalManager::GetSortedWalsOfType:1",
-       "WalManager::PurgeObsoleteFiles:1",
-       "WalManager::PurgeObsoleteFiles:2",
-       "WalManager::GetSortedWalsOfType:2"}};
-  for (int test = 0; test < LOG_ITERATOR_RACE_TEST_COUNT; ++test) {
-    // Setup sync point dependency to reproduce the race condition of
-    // a log file moved to archived dir, in the middle of GetSortedWalFiles
-    rocksdb::SyncPoint::GetInstance()->LoadDependency(
-      { { sync_points[test][0], sync_points[test][1] },
-        { sync_points[test][2], sync_points[test][3] },
-      });
-
-    do {
-      rocksdb::SyncPoint::GetInstance()->ClearTrace();
-      rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-      Options options = OptionsForLogIterTest();
-      DestroyAndReopen(options);
-      Put("key1", DummyString(1024));
-      dbfull()->Flush(FlushOptions());
-      Put("key2", DummyString(1024));
-      dbfull()->Flush(FlushOptions());
-      Put("key3", DummyString(1024));
-      dbfull()->Flush(FlushOptions());
-      Put("key4", DummyString(1024));
-      ASSERT_EQ(dbfull()->GetLatestSequenceNumber(), 4U);
-
-      {
-        auto iter = OpenTransactionLogIter(0);
-        ExpectRecords(4, iter);
-      }
-
-      rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-      // trigger async flush, and log move. Well, log move will
-      // wait until the GetSortedWalFiles:1 to reproduce the race
-      // condition
-      FlushOptions flush_options;
-      flush_options.wait = false;
-      dbfull()->Flush(flush_options);
-
-      // "key5" would be written in a new memtable and log
-      Put("key5", DummyString(1024));
-      {
-        // this iter would miss "key4" if not fixed
-        auto iter = OpenTransactionLogIter(0);
-        ExpectRecords(5, iter);
-      }
-    } while (ChangeCompactOptions());
-  }
-}
-#endif
-
-TEST_F(DBTestXactLogIterator, TransactionLogIteratorStallAtLastRecord) {
-  do {
-    Options options = OptionsForLogIterTest();
-    DestroyAndReopen(options);
-    Put("key1", DummyString(1024));
-    auto iter = OpenTransactionLogIter(0);
-    ASSERT_OK(iter->status());
-    ASSERT_TRUE(iter->Valid());
-    iter->Next();
-    ASSERT_TRUE(!iter->Valid());
-    ASSERT_OK(iter->status());
-    Put("key2", DummyString(1024));
-    iter->Next();
-    ASSERT_OK(iter->status());
-    ASSERT_TRUE(iter->Valid());
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestXactLogIterator, TransactionLogIteratorCheckAfterRestart) {
-  do {
-    Options options = OptionsForLogIterTest();
-    DestroyAndReopen(options);
-    Put("key1", DummyString(1024));
-    Put("key2", DummyString(1023));
-    dbfull()->Flush(FlushOptions());
-    Reopen(options);
-    auto iter = OpenTransactionLogIter(0);
-    ExpectRecords(2, iter);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestXactLogIterator, TransactionLogIteratorCorruptedLog) {
-  do {
-    Options options = OptionsForLogIterTest();
-    DestroyAndReopen(options);
-    for (int i = 0; i < 1024; i++) {
-      Put("key"+ToString(i), DummyString(10));
-    }
-    dbfull()->Flush(FlushOptions());
-    // Corrupt this log to create a gap
-    rocksdb::VectorLogPtr wal_files;
-    ASSERT_OK(dbfull()->GetSortedWalFiles(wal_files));
-    const auto logfile_path = dbname_ + "/" + wal_files.front()->PathName();
-    if (mem_env_) {
-      mem_env_->Truncate(logfile_path, wal_files.front()->SizeFileBytes() / 2);
-    } else {
-      ASSERT_EQ(0, truncate(logfile_path.c_str(),
-                   wal_files.front()->SizeFileBytes() / 2));
-    }
-
-    // Insert a new entry to a new log file
-    Put("key1025", DummyString(10));
-    // Try to read from the beginning. Should stop before the gap and read less
-    // than 1025 entries
-    auto iter = OpenTransactionLogIter(0);
-    int count;
-    SequenceNumber last_sequence_read = ReadRecords(iter, count);
-    ASSERT_LT(last_sequence_read, 1025U);
-    // Try to read past the gap, should be able to seek to key1025
-    auto iter2 = OpenTransactionLogIter(last_sequence_read + 1);
-    ExpectRecords(1, iter2);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestXactLogIterator, TransactionLogIteratorBatchOperations) {
-  do {
-    Options options = OptionsForLogIterTest();
-    DestroyAndReopen(options);
-    CreateAndReopenWithCF({"pikachu"}, options);
-    WriteBatch batch;
-    batch.Put(handles_[1], "key1", DummyString(1024));
-    batch.Put(handles_[0], "key2", DummyString(1024));
-    batch.Put(handles_[1], "key3", DummyString(1024));
-    batch.Delete(handles_[0], "key2");
-    dbfull()->Write(WriteOptions(), &batch);
-    Flush(1);
-    Flush(0);
-    ReopenWithColumnFamilies({"default", "pikachu"}, options);
-    Put(1, "key4", DummyString(1024));
-    auto iter = OpenTransactionLogIter(3);
-    ExpectRecords(2, iter);
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBTestXactLogIterator, TransactionLogIteratorBlobs) {
-  Options options = OptionsForLogIterTest();
-  DestroyAndReopen(options);
-  CreateAndReopenWithCF({"pikachu"}, options);
-  {
-    WriteBatch batch;
-    batch.Put(handles_[1], "key1", DummyString(1024));
-    batch.Put(handles_[0], "key2", DummyString(1024));
-    batch.PutLogData(Slice("blob1"));
-    batch.Put(handles_[1], "key3", DummyString(1024));
-    batch.PutLogData(Slice("blob2"));
-    batch.Delete(handles_[0], "key2");
-    dbfull()->Write(WriteOptions(), &batch);
-    ReopenWithColumnFamilies({"default", "pikachu"}, options);
-  }
-
-  auto res = OpenTransactionLogIter(0)->GetBatch();
-  struct Handler : public WriteBatch::Handler {
-    std::string seen;
-    virtual Status PutCF(uint32_t cf, const Slice& key,
-                         const Slice& value) override {
-      seen += "Put(" + ToString(cf) + ", " + key.ToString() + ", " +
-              ToString(value.size()) + ")";
-      return Status::OK();
-    }
-    virtual Status MergeCF(uint32_t cf, const Slice& key,
-                           const Slice& value) override {
-      seen += "Merge(" + ToString(cf) + ", " + key.ToString() + ", " +
-              ToString(value.size()) + ")";
-      return Status::OK();
-    }
-    virtual void LogData(const Slice& blob) override {
-      seen += "LogData(" + blob.ToString() + ")";
-    }
-    virtual Status DeleteCF(uint32_t cf, const Slice& key) override {
-      seen += "Delete(" + ToString(cf) + ", " + key.ToString() + ")";
-      return Status::OK();
-    }
-  } handler;
-  res.writeBatchPtr->Iterate(&handler);
-  ASSERT_EQ(
-      "Put(1, key1, 1024)"
-      "Put(0, key2, 1024)"
-      "LogData(blob1)"
-      "Put(1, key3, 1024)"
-      "LogData(blob2)"
-      "Delete(0, key2)",
-      handler.seen);
-}
-}  // namespace rocksdb
-
-#endif  // !(defined NDEBUG) || !defined(OS_WIN)
-
-int main(int argc, char** argv) {
-#if !(defined NDEBUG) || !defined(OS_WIN)
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-#else
-  return 0;
-#endif
-}
@@ -1,481 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-// Introduction of SyncPoint effectively disabled building and running this test
-// in Release build.
-// which is a pity, it is a good test
-#if !(defined NDEBUG) || !defined(OS_WIN)
-
-#include "port/stack_trace.h"
-#include "util/db_test_util.h"
-
-namespace rocksdb {
-
-class DBTestTailingIterator : public DBTestBase {
- public:
-  DBTestTailingIterator() : DBTestBase("/db_tailing_iterator_test") {}
-};
-
-TEST_F(DBTestTailingIterator, TailingIteratorSingle) {
-  ReadOptions read_options;
-  read_options.tailing = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
-  iter->SeekToFirst();
-  ASSERT_TRUE(!iter->Valid());
-
-  // add a record and check that iter can see it
-  ASSERT_OK(db_->Put(WriteOptions(), "mirko", "fodor"));
-  iter->SeekToFirst();
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(iter->key().ToString(), "mirko");
-
-  iter->Next();
-  ASSERT_TRUE(!iter->Valid());
-}
-
-TEST_F(DBTestTailingIterator, TailingIteratorKeepAdding) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-  std::string value(1024, 'a');
-
-  const int num_records = 10000;
-  for (int i = 0; i < num_records; ++i) {
-    char buf[32];
-    snprintf(buf, sizeof(buf), "%016d", i);
-
-    Slice key(buf, 16);
-    ASSERT_OK(Put(1, key, value));
-
-    iter->Seek(key);
-    ASSERT_TRUE(iter->Valid());
-    ASSERT_EQ(iter->key().compare(key), 0);
-  }
-}
-
-TEST_F(DBTestTailingIterator, TailingIteratorSeekToNext) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-  std::string value(1024, 'a');
-
-  const int num_records = 1000;
-  for (int i = 1; i < num_records; ++i) {
-    char buf1[32];
-    char buf2[32];
-    snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
-
-    Slice key(buf1, 20);
-    ASSERT_OK(Put(1, key, value));
-
-    if (i % 100 == 99) {
-      ASSERT_OK(Flush(1));
-    }
-
-    snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
-    Slice target(buf2, 20);
-    iter->Seek(target);
-    ASSERT_TRUE(iter->Valid());
-    ASSERT_EQ(iter->key().compare(key), 0);
-  }
-  for (int i = 2 * num_records; i > 0; --i) {
-    char buf1[32];
-    char buf2[32];
-    snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
-
-    Slice key(buf1, 20);
-    ASSERT_OK(Put(1, key, value));
-
-    if (i % 100 == 99) {
-      ASSERT_OK(Flush(1));
-    }
-
-    snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
-    Slice target(buf2, 20);
-    iter->Seek(target);
-    ASSERT_TRUE(iter->Valid());
-    ASSERT_EQ(iter->key().compare(key), 0);
-  }
-}
-
-TEST_F(DBTestTailingIterator, TailingIteratorDeletes) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-
-  // write a single record, read it using the iterator, then delete it
-  ASSERT_OK(Put(1, "0test", "test"));
-  iter->SeekToFirst();
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(iter->key().ToString(), "0test");
-  ASSERT_OK(Delete(1, "0test"));
-
-  // write many more records
-  const int num_records = 10000;
-  std::string value(1024, 'A');
-
-  for (int i = 0; i < num_records; ++i) {
-    char buf[32];
-    snprintf(buf, sizeof(buf), "1%015d", i);
-
-    Slice key(buf, 16);
-    ASSERT_OK(Put(1, key, value));
-  }
-
-  // force a flush to make sure that no records are read from memtable
-  ASSERT_OK(Flush(1));
-
-  // skip "0test"
-  iter->Next();
-
-  // make sure we can read all new records using the existing iterator
-  int count = 0;
-  for (; iter->Valid(); iter->Next(), ++count) ;
-
-  ASSERT_EQ(count, num_records);
-}
-
-TEST_F(DBTestTailingIterator, TailingIteratorPrefixSeek) {
-  XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip,
-             kSkipNoPrefix);
-  ReadOptions read_options;
-  read_options.tailing = true;
-
-  Options options = CurrentOptions();
-  options.env = env_;
-  options.create_if_missing = true;
-  options.disable_auto_compactions = true;
-  options.prefix_extractor.reset(NewFixedPrefixTransform(2));
-  options.memtable_factory.reset(NewHashSkipListRepFactory(16));
-  DestroyAndReopen(options);
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-  ASSERT_OK(Put(1, "0101", "test"));
-
-  ASSERT_OK(Flush(1));
-
-  ASSERT_OK(Put(1, "0202", "test"));
-
-  // Seek(0102) shouldn't find any records since 0202 has a different prefix
-  iter->Seek("0102");
-  ASSERT_TRUE(!iter->Valid());
-
-  iter->Seek("0202");
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(iter->key().ToString(), "0202");
-
-  iter->Next();
-  ASSERT_TRUE(!iter->Valid());
-  XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip, 0);
-}
-
-TEST_F(DBTestTailingIterator, TailingIteratorIncomplete) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.read_tier = kBlockCacheTier;
-
-  std::string key("key");
-  std::string value("value");
-
-  ASSERT_OK(db_->Put(WriteOptions(), key, value));
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
-  iter->SeekToFirst();
-  // we either see the entry or it's not in cache
-  ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
-  iter->SeekToFirst();
-  // should still be true after compaction
-  ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
-}
-
-TEST_F(DBTestTailingIterator, TailingIteratorSeekToSame) {
-  Options options = CurrentOptions();
-  options.compaction_style = kCompactionStyleUniversal;
-  options.write_buffer_size = 1000;
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  ReadOptions read_options;
-  read_options.tailing = true;
-
-  const int NROWS = 10000;
-  // Write rows with keys 00000, 00002, 00004 etc.
-  for (int i = 0; i < NROWS; ++i) {
-    char buf[100];
-    snprintf(buf, sizeof(buf), "%05d", 2*i);
-    std::string key(buf);
-    std::string value("value");
-    ASSERT_OK(db_->Put(WriteOptions(), key, value));
-  }
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
-  // Seek to 00001.  We expect to find 00002.
-  std::string start_key = "00001";
-  iter->Seek(start_key);
-  ASSERT_TRUE(iter->Valid());
-
-  std::string found = iter->key().ToString();
-  ASSERT_EQ("00002", found);
-
-  // Now seek to the same key.  The iterator should remain in the same
-  // position.
-  iter->Seek(found);
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(found, iter->key().ToString());
-}
-
-TEST_F(DBTestTailingIterator, ManagedTailingIteratorSingle) {
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.managed = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
-  iter->SeekToFirst();
-  ASSERT_TRUE(!iter->Valid());
-
-  // add a record and check that iter can see it
-  ASSERT_OK(db_->Put(WriteOptions(), "mirko", "fodor"));
-  iter->SeekToFirst();
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(iter->key().ToString(), "mirko");
-
-  iter->Next();
-  ASSERT_TRUE(!iter->Valid());
-}
-
-TEST_F(DBTestTailingIterator, ManagedTailingIteratorKeepAdding) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.managed = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-  std::string value(1024, 'a');
-
-  const int num_records = 10000;
-  for (int i = 0; i < num_records; ++i) {
-    char buf[32];
-    snprintf(buf, sizeof(buf), "%016d", i);
-
-    Slice key(buf, 16);
-    ASSERT_OK(Put(1, key, value));
-
-    iter->Seek(key);
-    ASSERT_TRUE(iter->Valid());
-    ASSERT_EQ(iter->key().compare(key), 0);
-  }
-}
-
-TEST_F(DBTestTailingIterator, ManagedTailingIteratorSeekToNext) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.managed = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-  std::string value(1024, 'a');
-
-  const int num_records = 1000;
-  for (int i = 1; i < num_records; ++i) {
-    char buf1[32];
-    char buf2[32];
-    snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
-
-    Slice key(buf1, 20);
-    ASSERT_OK(Put(1, key, value));
-
-    if (i % 100 == 99) {
-      ASSERT_OK(Flush(1));
-    }
-
-    snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
-    Slice target(buf2, 20);
-    iter->Seek(target);
-    ASSERT_TRUE(iter->Valid());
-    ASSERT_EQ(iter->key().compare(key), 0);
-  }
-  for (int i = 2 * num_records; i > 0; --i) {
-    char buf1[32];
-    char buf2[32];
-    snprintf(buf1, sizeof(buf1), "00a0%016d", i * 5);
-
-    Slice key(buf1, 20);
-    ASSERT_OK(Put(1, key, value));
-
-    if (i % 100 == 99) {
-      ASSERT_OK(Flush(1));
-    }
-
-    snprintf(buf2, sizeof(buf2), "00a0%016d", i * 5 - 2);
-    Slice target(buf2, 20);
-    iter->Seek(target);
-    ASSERT_TRUE(iter->Valid());
-    ASSERT_EQ(iter->key().compare(key), 0);
-  }
-}
-
-TEST_F(DBTestTailingIterator, ManagedTailingIteratorDeletes) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.managed = true;
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-
-  // write a single record, read it using the iterator, then delete it
-  ASSERT_OK(Put(1, "0test", "test"));
-  iter->SeekToFirst();
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(iter->key().ToString(), "0test");
-  ASSERT_OK(Delete(1, "0test"));
-
-  // write many more records
-  const int num_records = 10000;
-  std::string value(1024, 'A');
-
-  for (int i = 0; i < num_records; ++i) {
-    char buf[32];
-    snprintf(buf, sizeof(buf), "1%015d", i);
-
-    Slice key(buf, 16);
-    ASSERT_OK(Put(1, key, value));
-  }
-
-  // force a flush to make sure that no records are read from memtable
-  ASSERT_OK(Flush(1));
-
-  // skip "0test"
-  iter->Next();
-
-  // make sure we can read all new records using the existing iterator
-  int count = 0;
-  for (; iter->Valid(); iter->Next(), ++count) {
-  }
-
-  ASSERT_EQ(count, num_records);
-}
-
-TEST_F(DBTestTailingIterator, ManagedTailingIteratorPrefixSeek) {
-  XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip,
-             kSkipNoPrefix);
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.managed = true;
-
-  Options options = CurrentOptions();
-  options.env = env_;
-  options.create_if_missing = true;
-  options.disable_auto_compactions = true;
-  options.prefix_extractor.reset(NewFixedPrefixTransform(2));
-  options.memtable_factory.reset(NewHashSkipListRepFactory(16));
-  DestroyAndReopen(options);
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
-  ASSERT_OK(Put(1, "0101", "test"));
-
-  ASSERT_OK(Flush(1));
-
-  ASSERT_OK(Put(1, "0202", "test"));
-
-  // Seek(0102) shouldn't find any records since 0202 has a different prefix
-  iter->Seek("0102");
-  ASSERT_TRUE(!iter->Valid());
-
-  iter->Seek("0202");
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(iter->key().ToString(), "0202");
-
-  iter->Next();
-  ASSERT_TRUE(!iter->Valid());
-  XFUNC_TEST("", "dbtest_prefix", prefix_skip1, XFuncPoint::SetSkip, 0);
-}
-
-TEST_F(DBTestTailingIterator, ManagedTailingIteratorIncomplete) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.managed = true;
-  read_options.read_tier = kBlockCacheTier;
-
-  std::string key = "key";
-  std::string value = "value";
-
-  ASSERT_OK(db_->Put(WriteOptions(), key, value));
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
-  iter->SeekToFirst();
-  // we either see the entry or it's not in cache
-  ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
-  iter->SeekToFirst();
-  // should still be true after compaction
-  ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
-}
-
-TEST_F(DBTestTailingIterator, ManagedTailingIteratorSeekToSame) {
-  Options options = CurrentOptions();
-  options.compaction_style = kCompactionStyleUniversal;
-  options.write_buffer_size = 1000;
-  CreateAndReopenWithCF({"pikachu"}, options);
-
-  ReadOptions read_options;
-  read_options.tailing = true;
-  read_options.managed = true;
-
-  const int NROWS = 10000;
-  // Write rows with keys 00000, 00002, 00004 etc.
-  for (int i = 0; i < NROWS; ++i) {
-    char buf[100];
-    snprintf(buf, sizeof(buf), "%05d", 2 * i);
-    std::string key(buf);
-    std::string value("value");
-    ASSERT_OK(db_->Put(WriteOptions(), key, value));
-  }
-
-  std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
-  // Seek to 00001.  We expect to find 00002.
-  std::string start_key = "00001";
-  iter->Seek(start_key);
-  ASSERT_TRUE(iter->Valid());
-
-  std::string found = iter->key().ToString();
-  ASSERT_EQ("00002", found);
-
-  // Now seek to the same key.  The iterator should remain in the same
-  // position.
-  iter->Seek(found);
-  ASSERT_TRUE(iter->Valid());
-  ASSERT_EQ(found, iter->key().ToString());
-}
-
-}  // namespace rocksdb
-
-#endif  // !(defined NDEBUG) || !defined(OS_WIN)
-
-int main(int argc, char** argv) {
-#if !(defined NDEBUG) || !defined(OS_WIN)
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-#else
-  return 0;
-#endif
-}
@@ -1,144 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#include "port/stack_trace.h"
-#include "util/db_test_util.h"
-#if !(defined NDEBUG) || !defined(OS_WIN)
-#include "util/sync_point.h"
-#endif
-
-namespace rocksdb {
-class DBWALTest : public DBTestBase {
- public:
-  DBWALTest() : DBTestBase("/db_wal_test") {}
-};
-
-TEST_F(DBWALTest, WAL) {
-  do {
-    CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-    WriteOptions writeOpt = WriteOptions();
-    writeOpt.disableWAL = true;
-    ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "foo", "v1"));
-    ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "bar", "v1"));
-
-    ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
-    ASSERT_EQ("v1", Get(1, "foo"));
-    ASSERT_EQ("v1", Get(1, "bar"));
-
-    writeOpt.disableWAL = false;
-    ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "bar", "v2"));
-    writeOpt.disableWAL = true;
-    ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "foo", "v2"));
-
-    ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
-    // Both value's should be present.
-    ASSERT_EQ("v2", Get(1, "bar"));
-    ASSERT_EQ("v2", Get(1, "foo"));
-
-    writeOpt.disableWAL = true;
-    ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "bar", "v3"));
-    writeOpt.disableWAL = false;
-    ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "foo", "v3"));
-
-    ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
-    // again both values should be present.
-    ASSERT_EQ("v3", Get(1, "foo"));
-    ASSERT_EQ("v3", Get(1, "bar"));
-  } while (ChangeCompactOptions());
-}
-
-TEST_F(DBWALTest, RollLog) {
-  do {
-    CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-    ASSERT_OK(Put(1, "foo", "v1"));
-    ASSERT_OK(Put(1, "baz", "v5"));
-
-    ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
-    for (int i = 0; i < 10; i++) {
-      ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
-    }
-    ASSERT_OK(Put(1, "foo", "v4"));
-    for (int i = 0; i < 10; i++) {
-      ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
-    }
-  } while (ChangeOptions());
-}
-
-#if !(defined NDEBUG) || !defined(OS_WIN)
-TEST_F(DBWALTest, SyncWALNotBlockWrite) {
-  Options options = CurrentOptions();
-  options.max_write_buffer_number = 4;
-  DestroyAndReopen(options);
-
-  ASSERT_OK(Put("foo1", "bar1"));
-  ASSERT_OK(Put("foo5", "bar5"));
-
-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
-      {"WritableFileWriter::SyncWithoutFlush:1",
-       "DBWALTest::SyncWALNotBlockWrite:1"},
-      {"DBWALTest::SyncWALNotBlockWrite:2",
-       "WritableFileWriter::SyncWithoutFlush:2"},
-  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-  std::thread thread([&]() { ASSERT_OK(db_->SyncWAL()); });
-
-  TEST_SYNC_POINT("DBWALTest::SyncWALNotBlockWrite:1");
-  ASSERT_OK(Put("foo2", "bar2"));
-  ASSERT_OK(Put("foo3", "bar3"));
-  FlushOptions fo;
-  fo.wait = false;
-  ASSERT_OK(db_->Flush(fo));
-  ASSERT_OK(Put("foo4", "bar4"));
-
-  TEST_SYNC_POINT("DBWALTest::SyncWALNotBlockWrite:2");
-
-  thread.join();
-
-  ASSERT_EQ(Get("foo1"), "bar1");
-  ASSERT_EQ(Get("foo2"), "bar2");
-  ASSERT_EQ(Get("foo3"), "bar3");
-  ASSERT_EQ(Get("foo4"), "bar4");
-  ASSERT_EQ(Get("foo5"), "bar5");
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-}
-
-TEST_F(DBWALTest, SyncWALNotWaitWrite) {
-  ASSERT_OK(Put("foo1", "bar1"));
-  ASSERT_OK(Put("foo3", "bar3"));
-
-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
-      {"SpecialEnv::WalFile::Append:1", "DBWALTest::SyncWALNotWaitWrite:1"},
-      {"DBWALTest::SyncWALNotWaitWrite:2", "SpecialEnv::WalFile::Append:2"},
-  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-  std::thread thread([&]() { ASSERT_OK(Put("foo2", "bar2")); });
-  TEST_SYNC_POINT("DBWALTest::SyncWALNotWaitWrite:1");
-  ASSERT_OK(db_->SyncWAL());
-  TEST_SYNC_POINT("DBWALTest::SyncWALNotWaitWrite:2");
-
-  thread.join();
-
-  ASSERT_EQ(Get("foo1"), "bar1");
-  ASSERT_EQ(Get("foo2"), "bar2");
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-}
-#endif
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-#if !(defined NDEBUG) || !defined(OS_WIN)
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-#else
-  return 0;
-#endif
-}
@@ -8,11 +8,6 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 #include "db/dbformat.h"

-#ifndef __STDC_FORMAT_MACROS
-#define __STDC_FORMAT_MACROS
-#endif
-
-#include <inttypes.h>
 #include <stdio.h>
 #include "port/port.h"
 #include "util/coding.h"
@@ -26,14 +21,6 @@ uint64_t PackSequenceAndType(uint64_t seq, ValueType t) {
  return (seq << 8) | t;
 }

-void UnPackSequenceAndType(uint64_t packed, uint64_t* seq, ValueType* t) {
-  *seq = packed >> 8;
-  *t = static_cast<ValueType>(packed & 0xff);
-
-  assert(*seq <= kMaxSequenceNumber);
-  assert(*t <= kValueTypeForSeek);
-}
-
 void AppendInternalKey(std::string* result, const ParsedInternalKey& key) {
  result->append(key.user_key.data(), key.user_key.size());
  PutFixed64(result, PackSequenceAndType(key.sequence, key.type));
@@ -41,8 +28,9 @@ void AppendInternalKey(std::string* result, const ParsedInternalKey& key) {

 std::string ParsedInternalKey::DebugString(bool hex) const {
  char buf[50];
-  snprintf(buf, sizeof(buf), "' @ %" PRIu64 ": %d", sequence,
-           static_cast<int>(type));
+  snprintf(buf, sizeof(buf), "' @ %llu : %d",
+           (unsigned long long) sequence,
+           int(type));
  std::string result = "'";
  result += user_key.ToString(hex);
  result += buf;
@@ -149,8 +137,7 @@ LookupKey::LookupKey(const Slice& _user_key, SequenceNumber s) {
    dst = new char[needed];
  }
  start_ = dst;
-  // NOTE: We don't support users keys of more than 2GB :)
-  dst = EncodeVarint32(dst, static_cast<uint32_t>(usize + 8));
+  dst = EncodeVarint32(dst, usize + 8);
  kstart_ = dst;
  memcpy(dst, _user_key.data(), usize);
  dst += usize;
@@ -71,13 +71,8 @@ inline size_t InternalKeyEncodingLength(const ParsedInternalKey& key) {
  return key.user_key.size() + 8;
 }

-// Pack a sequence number and a ValueType into a uint64_t
 extern uint64_t PackSequenceAndType(uint64_t seq, ValueType t);

-// Given the result of PackSequenceAndType, store the sequence number in *seq
-// and the ValueType in *t.
-extern void UnPackSequenceAndType(uint64_t packed, uint64_t* seq, ValueType* t);
-
 // Append the serialization of "key" to *result.
 extern void AppendInternalKey(std::string* result,
                              const ParsedInternalKey& key);
@@ -116,11 +111,12 @@ class InternalKeyComparator : public Comparator {
  }
  virtual ~InternalKeyComparator() {}

-  virtual const char* Name() const override;
-  virtual int Compare(const Slice& a, const Slice& b) const override;
-  virtual void FindShortestSeparator(std::string* start,
-                                     const Slice& limit) const override;
-  virtual void FindShortSuccessor(std::string* key) const override;
+  virtual const char* Name() const;
+  virtual int Compare(const Slice& a, const Slice& b) const;
+  virtual void FindShortestSeparator(
+      std::string* start,
+      const Slice& limit) const;
+  virtual void FindShortSuccessor(std::string* key) const;

  const Comparator* user_comparator() const { return user_comparator_; }

@@ -140,20 +136,6 @@ class InternalKey {
    AppendInternalKey(&rep_, ParsedInternalKey(_user_key, s, t));
  }

-  // sets the internal key to be bigger or equal to all internal keys with this
-  // user key
-  void SetMaxPossibleForUserKey(const Slice& _user_key) {
-    AppendInternalKey(&rep_, ParsedInternalKey(_user_key, kMaxSequenceNumber,
-                                               kValueTypeForSeek));
-  }
-
-  // sets the internal key to be smaller or equal to all internal keys with this
-  // user key
-  void SetMinPossibleForUserKey(const Slice& _user_key) {
-    AppendInternalKey(
-        &rep_, ParsedInternalKey(_user_key, 0, static_cast<ValueType>(0)));
-  }
-
  bool Valid() const {
    ParsedInternalKey parsed;
    return ParseInternalKey(Slice(rep_), &parsed);
@@ -195,17 +177,14 @@ inline bool ParseInternalKey(const Slice& internal_key,
  return (c <= static_cast<unsigned char>(kValueTypeForSeek));
 }

-// Update the sequence number in the internal key.
-// Guarantees not to invalidate ikey.data().
-inline void UpdateInternalKey(std::string* ikey,
+// Update the sequence number in the internal key
+inline void UpdateInternalKey(char* internal_key,
+                              const size_t internal_key_size,
                              uint64_t seq, ValueType t) {
-  size_t ikey_sz = ikey->size();
-  assert(ikey_sz >= 8);
+  assert(internal_key_size >= 8);
+  char* seqtype = internal_key + internal_key_size - 8;
  uint64_t newval = (seq << 8) | t;
-
-  // Note: Since C++11, strings are guaranteed to be stored contiguously and
-  // string::operator[]() is guaranteed not to change ikey.data().
-  EncodeFixed64(&(*ikey)[ikey_sz - 8], newval);
+  EncodeFixed64(seqtype, newval);
 }

 // Get the sequence number from the internal key
@@ -227,19 +206,13 @@ class LookupKey {
  ~LookupKey();

  // Return a key suitable for lookup in a MemTable.
-  Slice memtable_key() const {
-    return Slice(start_, static_cast<size_t>(end_ - start_));
-  }
+  Slice memtable_key() const { return Slice(start_, end_ - start_); }

  // Return an internal key (suitable for passing to an internal iterator)
-  Slice internal_key() const {
-    return Slice(kstart_, static_cast<size_t>(end_ - kstart_));
-  }
+  Slice internal_key() const { return Slice(kstart_, end_ - kstart_); }

  // Return the user key
-  Slice user_key() const {
-    return Slice(kstart_, static_cast<size_t>(end_ - kstart_ - 8));
-  }
+  Slice user_key() const { return Slice(kstart_, end_ - kstart_ - 8); }

 private:
  // We construct a char array of the form:
@@ -346,8 +319,8 @@ class IterKey {

  void EncodeLengthPrefixedKey(const Slice& key) {
    auto size = key.size();
-    EnlargeBufferIfNeeded(size + static_cast<size_t>(VarintLength(size)));
-    char* ptr = EncodeVarint32(key_, static_cast<uint32_t>(size));
+    EnlargeBufferIfNeeded(size + VarintLength(size));
+    char* ptr = EncodeVarint32(key_, size);
    memcpy(ptr, key.data(), size);
  }

@@ -392,19 +365,19 @@ class InternalKeySliceTransform : public SliceTransform {
  explicit InternalKeySliceTransform(const SliceTransform* transform)
      : transform_(transform) {}

-  virtual const char* Name() const override { return transform_->Name(); }
+  virtual const char* Name() const { return transform_->Name(); }

-  virtual Slice Transform(const Slice& src) const override {
+  virtual Slice Transform(const Slice& src) const {
    auto user_key = ExtractUserKey(src);
    return transform_->Transform(user_key);
  }

-  virtual bool InDomain(const Slice& src) const override {
+  virtual bool InDomain(const Slice& src) const {
    auto user_key = ExtractUserKey(src);
    return transform_->InDomain(user_key);
  }

-  virtual bool InRange(const Slice& dst) const override {
+  virtual bool InRange(const Slice& dst) const {
    auto user_key = ExtractUserKey(dst);
    return transform_->InRange(user_key);
  }
@@ -49,9 +49,9 @@ static void TestKey(const std::string& key,
  ASSERT_TRUE(!ParseInternalKey(Slice("bar"), &decoded));
 }

-class FormatTest : public testing::Test {};
+class FormatTest { };

-TEST_F(FormatTest, InternalKey_EncodeDecode) {
+TEST(FormatTest, InternalKey_EncodeDecode) {
  const char* keys[] = { "", "k", "hello", "longggggggggggggggggggggg" };
  const uint64_t seq[] = {
    1, 2, 3,
@@ -67,7 +67,7 @@ TEST_F(FormatTest, InternalKey_EncodeDecode) {
  }
 }

-TEST_F(FormatTest, InternalKeyShortSeparator) {
+TEST(FormatTest, InternalKeyShortSeparator) {
  // When user keys are same
  ASSERT_EQ(IKey("foo", 100, kTypeValue),
            Shorten(IKey("foo", 100, kTypeValue),
@@ -103,14 +103,14 @@ TEST_F(FormatTest, InternalKeyShortSeparator) {
                    IKey("foo", 200, kTypeValue)));
 }

-TEST_F(FormatTest, InternalKeyShortestSuccessor) {
+TEST(FormatTest, InternalKeyShortestSuccessor) {
  ASSERT_EQ(IKey("g", kMaxSequenceNumber, kValueTypeForSeek),
            ShortSuccessor(IKey("foo", 100, kTypeValue)));
  ASSERT_EQ(IKey("\xff\xff", 100, kTypeValue),
            ShortSuccessor(IKey("\xff\xff", 100, kTypeValue)));
 }

-TEST_F(FormatTest, IterKeyOperation) {
+TEST(FormatTest, IterKeyOperation) {
  IterKey k;
  const char p[] = "abcdefghijklmnopqrstuvwxyz";
  const char q[] = "0123456789";
@@ -149,28 +149,8 @@ TEST_F(FormatTest, IterKeyOperation) {
              "abcdefghijklmnopqrstuvwxyz"));
 }

-TEST_F(FormatTest, UpdateInternalKey) {
-  std::string user_key("abcdefghijklmnopqrstuvwxyz");
-  uint64_t new_seq = 0x123456;
-  ValueType new_val_type = kTypeDeletion;
-
-  std::string ikey;
-  AppendInternalKey(&ikey, ParsedInternalKey(user_key, 100U, kTypeValue));
-  size_t ikey_size = ikey.size();
-  UpdateInternalKey(&ikey, new_seq, new_val_type);
-  ASSERT_EQ(ikey_size, ikey.size());
-
-  Slice in(ikey);
-  ParsedInternalKey decoded;
-  ASSERT_TRUE(ParseInternalKey(in, &decoded));
-  ASSERT_EQ(user_key, decoded.user_key.ToString());
-  ASSERT_EQ(new_seq, decoded.sequence);
-  ASSERT_EQ(new_val_type, decoded.type);
-}
-
 }  // namespace rocksdb

 int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+  return rocksdb::test::RunAllTests();
 }
@@ -7,14 +7,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.

-#ifndef ROCKSDB_LITE
-
 #include "rocksdb/db.h"
 #include "db/db_impl.h"
 #include "db/filename.h"
 #include "db/version_set.h"
 #include "db/write_batch_internal.h"
-#include "util/string_util.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
 #include "rocksdb/env.h"
@@ -26,7 +23,7 @@

 namespace rocksdb {

-class DeleteFileTest : public testing::Test {
+class DeleteFileTest {
 public:
  std::string dbname_;
  Options options_;
@@ -37,7 +34,7 @@ class DeleteFileTest : public testing::Test {
  DeleteFileTest() {
    db_ = nullptr;
    env_ = Env::Default();
-    options_.enable_thread_tracking = true;
+    options_.max_background_flushes = 0;
    options_.write_buffer_size = 1024*1024*1000;
    options_.target_file_size_base = 1024*1024*1000;
    options_.max_bytes_for_level_base = 1024*1024*1000;
@@ -59,7 +56,7 @@ class DeleteFileTest : public testing::Test {

    DestroyDB(dbname_, options_);
    numlevels_ = 7;
-    EXPECT_OK(ReopenDB(true));
+    ASSERT_OK(ReopenDB(true));
  }

  Status ReopenDB(bool create) {
@@ -81,7 +78,7 @@ class DeleteFileTest : public testing::Test {
    options.sync = false;
    ReadOptions roptions;
    for (int i = startkey; i < (numkeys + startkey) ; i++) {
-      std::string temp = ToString(i);
+      std::string temp = std::to_string(i);
      Slice key(temp);
      Slice value(temp);
      ASSERT_OK(db_->Put(options, key, value));
@@ -118,14 +115,10 @@ class DeleteFileTest : public testing::Test {
    DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
    ASSERT_OK(dbi->TEST_FlushMemTable());
    ASSERT_OK(dbi->TEST_WaitForFlushMemTable());
-    for (int i = 0; i < 2; ++i) {
-      ASSERT_OK(dbi->TEST_CompactRange(i, nullptr, nullptr));
-    }

    AddKeys(50000, 10000);
    ASSERT_OK(dbi->TEST_FlushMemTable());
    ASSERT_OK(dbi->TEST_WaitForFlushMemTable());
-    ASSERT_OK(dbi->TEST_CompactRange(0, nullptr, nullptr));
  }

  void CheckFileTypeCounts(std::string& dir,
@@ -152,7 +145,7 @@ class DeleteFileTest : public testing::Test {

 };

-TEST_F(DeleteFileTest, AddKeysAndQueryLevels) {
+TEST(DeleteFileTest, AddKeysAndQueryLevels) {
  CreateTwoLevels();
  std::vector<LiveFileMetaData> metadata;
  db_->GetLiveFilesMetaData(&metadata);
@@ -198,7 +191,7 @@ TEST_F(DeleteFileTest, AddKeysAndQueryLevels) {
  CloseDB();
 }

-TEST_F(DeleteFileTest, PurgeObsoleteFilesTest) {
+TEST(DeleteFileTest, PurgeObsoleteFilesTest) {
  CreateTwoLevels();
  // there should be only one (empty) log file because CreateTwoLevels()
  // flushes the memtables to disk
@@ -206,11 +199,8 @@ TEST_F(DeleteFileTest, PurgeObsoleteFilesTest) {
  // 2 ssts, 1 manifest
  CheckFileTypeCounts(dbname_, 0, 2, 1);
  std::string first("0"), last("999999");
-  CompactRangeOptions compact_options;
-  compact_options.change_level = true;
-  compact_options.target_level = 2;
  Slice first_slice(first), last_slice(last);
-  db_->CompactRange(compact_options, &first_slice, &last_slice);
+  db_->CompactRange(&first_slice, &last_slice, true, 2);
  // 1 sst after compaction
  CheckFileTypeCounts(dbname_, 0, 1, 1);

@@ -219,7 +209,7 @@ TEST_F(DeleteFileTest, PurgeObsoleteFilesTest) {
  Iterator *itr = 0;
  CreateTwoLevels();
  itr = db_->NewIterator(ReadOptions());
-  db_->CompactRange(compact_options, &first_slice, &last_slice);
+  db_->CompactRange(&first_slice, &last_slice, true, 2);
  // 3 sst after compaction with live iterator
  CheckFileTypeCounts(dbname_, 0, 3, 1);
  delete itr;
@@ -229,7 +219,7 @@ TEST_F(DeleteFileTest, PurgeObsoleteFilesTest) {
  CloseDB();
 }

-TEST_F(DeleteFileTest, DeleteFileWithIterator) {
+TEST(DeleteFileTest, DeleteFileWithIterator) {
  CreateTwoLevels();
  ReadOptions options;
  Iterator* it = db_->NewIterator(options);
@@ -260,7 +250,7 @@ TEST_F(DeleteFileTest, DeleteFileWithIterator) {
  CloseDB();
 }

-TEST_F(DeleteFileTest, DeleteLogFiles) {
+TEST(DeleteFileTest, DeleteLogFiles) {
  AddKeys(10, 0);
  VectorLogPtr logfiles;
  db_->GetSortedWalFiles(logfiles);
@@ -269,11 +259,11 @@ TEST_F(DeleteFileTest, DeleteLogFiles) {
  // Should not succeed because live logs are not allowed to be deleted
  std::unique_ptr<LogFile> alive_log = std::move(logfiles.back());
  ASSERT_EQ(alive_log->Type(), kAliveLogFile);
-  ASSERT_OK(env_->FileExists(options_.wal_dir + "/" + alive_log->PathName()));
+  ASSERT_TRUE(env_->FileExists(options_.wal_dir + "/" + alive_log->PathName()));
  fprintf(stdout, "Deleting alive log file %s\n",
          alive_log->PathName().c_str());
  ASSERT_TRUE(!db_->DeleteFile(alive_log->PathName()).ok());
-  ASSERT_OK(env_->FileExists(options_.wal_dir + "/" + alive_log->PathName()));
+  ASSERT_TRUE(env_->FileExists(options_.wal_dir + "/" + alive_log->PathName()));
  logfiles.clear();

  // Call Flush to bring about a new working log file and add more keys
@@ -287,17 +277,17 @@ TEST_F(DeleteFileTest, DeleteLogFiles) {
  ASSERT_GT(logfiles.size(), 0UL);
  std::unique_ptr<LogFile> archived_log = std::move(logfiles.front());
  ASSERT_EQ(archived_log->Type(), kArchivedLogFile);
-  ASSERT_OK(
-      env_->FileExists(options_.wal_dir + "/" + archived_log->PathName()));
+  ASSERT_TRUE(env_->FileExists(options_.wal_dir + "/" +
+        archived_log->PathName()));
  fprintf(stdout, "Deleting archived log file %s\n",
          archived_log->PathName().c_str());
  ASSERT_OK(db_->DeleteFile(archived_log->PathName()));
-  ASSERT_EQ(Status::NotFound(), env_->FileExists(options_.wal_dir + "/" +
-                                                 archived_log->PathName()));
+  ASSERT_TRUE(!env_->FileExists(options_.wal_dir + "/" +
+        archived_log->PathName()));
  CloseDB();
 }

-TEST_F(DeleteFileTest, DeleteNonDefaultColumnFamily) {
+TEST(DeleteFileTest, DeleteNonDefaultColumnFamily) {
  CloseDB();
  DBOptions db_options;
  db_options.create_if_missing = true;
@@ -369,17 +359,6 @@ TEST_F(DeleteFileTest, DeleteNonDefaultColumnFamily) {
 } //namespace rocksdb

 int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+  return rocksdb::test::RunAllTests();
 }

-#else
-#include <stdio.h>
-
-int main(int argc, char** argv) {
-  fprintf(stderr,
-          "SKIPPED as DBImpl::DeleteFile is not supported in ROCKSDB_LITE\n");
-  return 0;
-}
-
-#endif  // !ROCKSDB_LITE
@@ -1,108 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-
-#include "db/event_helpers.h"
-
-namespace rocksdb {
-
-namespace {
-inline double SafeDivide(double a, double b) { return b == 0.0 ? 0 : a / b; }
-}  // namespace
-
-void EventHelpers::AppendCurrentTime(JSONWriter* jwriter) {
-  *jwriter << "time_micros"
-           << std::chrono::duration_cast<std::chrono::microseconds>(
-                  std::chrono::system_clock::now().time_since_epoch()).count();
-}
-
-void EventHelpers::LogAndNotifyTableFileCreation(
-    EventLogger* event_logger,
-    const std::vector<std::shared_ptr<EventListener>>& listeners,
-    const FileDescriptor& fd, const TableFileCreationInfo& info) {
-  assert(event_logger);
-  JSONWriter jwriter;
-  AppendCurrentTime(&jwriter);
-  jwriter << "cf_name" << info.cf_name
-          << "job" << info.job_id
-          << "event" << "table_file_creation"
-          << "file_number" << fd.GetNumber()
-          << "file_size" << fd.GetFileSize();
-
-  // table_properties
-  {
-    jwriter << "table_properties";
-    jwriter.StartObject();
-
-    // basic properties:
-    jwriter << "data_size" << info.table_properties.data_size
-            << "index_size" << info.table_properties.index_size
-            << "filter_size" << info.table_properties.filter_size
-            << "raw_key_size" << info.table_properties.raw_key_size
-            << "raw_average_key_size" << SafeDivide(
-                info.table_properties.raw_key_size,
-                info.table_properties.num_entries)
-            << "raw_value_size" << info.table_properties.raw_value_size
-            << "raw_average_value_size" << SafeDivide(
-               info.table_properties.raw_value_size,
-               info.table_properties.num_entries)
-            << "num_data_blocks" << info.table_properties.num_data_blocks
-            << "num_entries" << info.table_properties.num_entries
-            << "filter_policy_name" <<
-                info.table_properties.filter_policy_name;
-
-    // user collected properties
-    for (const auto& prop : info.table_properties.user_collected_properties) {
-      jwriter << prop.first << prop.second;
-    }
-    jwriter.EndObject();
-  }
-  jwriter.EndObject();
-
-  event_logger->Log(jwriter);
-
-#ifndef ROCKSDB_LITE
-  if (listeners.size() == 0) {
-    return;
-  }
-
-  for (auto listener : listeners) {
-    listener->OnTableFileCreated(info);
-  }
-#endif  // !ROCKSDB_LITE
-}
-
-void EventHelpers::LogAndNotifyTableFileDeletion(
-    EventLogger* event_logger, int job_id,
-    uint64_t file_number, const std::string& file_path,
-    const Status& status, const std::string& dbname,
-    const std::vector<std::shared_ptr<EventListener>>& listeners) {
-
-  JSONWriter jwriter;
-  AppendCurrentTime(&jwriter);
-
-  jwriter << "job" << job_id
-          << "event" << "table_file_deletion"
-          << "file_number" << file_number;
-  if (!status.ok()) {
-    jwriter << "status" << status.ToString();
-  }
-
-  jwriter.EndObject();
-
-  event_logger->Log(jwriter);
-
-#ifndef ROCKSDB_LITE
-  TableFileDeletionInfo info;
-  info.db_name = dbname;
-  info.job_id = job_id;
-  info.file_path = file_path;
-  info.status = status;
-  for (auto listener : listeners) {
-    listener->OnTableFileDeleted(info);
-  }
-#endif  // !ROCKSDB_LITE
-}
-
-}  // namespace rocksdb
@@ -1,33 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-#pragma once
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "db/column_family.h"
-#include "db/version_edit.h"
-#include "rocksdb/listener.h"
-#include "rocksdb/table_properties.h"
-#include "util/event_logger.h"
-
-namespace rocksdb {
-
-class EventHelpers {
- public:
-  static void AppendCurrentTime(JSONWriter* json_writer);
-  static void LogAndNotifyTableFileCreation(
-      EventLogger* event_logger,
-      const std::vector<std::shared_ptr<EventListener>>& listeners,
-      const FileDescriptor& fd, const TableFileCreationInfo& info);
-  static void LogAndNotifyTableFileDeletion(
-      EventLogger* event_logger, int job_id,
-      uint64_t file_number, const std::string& file_path,
-      const Status& status, const std::string& db_name,
-      const std::vector<std::shared_ptr<EventListener>>& listeners);
-};
-
-}  // namespace rocksdb
@@ -1,51 +0,0 @@
-//  Copyright (c) 2014, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-
-#include "rocksdb/experimental.h"
-
-#include "db/db_impl.h"
-
-namespace rocksdb {
-namespace experimental {
-
-#ifndef ROCKSDB_LITE
-
-Status SuggestCompactRange(DB* db, ColumnFamilyHandle* column_family,
-                           const Slice* begin, const Slice* end) {
-  auto dbimpl = dynamic_cast<DBImpl*>(db);
-  if (dbimpl == nullptr) {
-    return Status::InvalidArgument("Didn't recognize DB object");
-  }
-
-  return dbimpl->SuggestCompactRange(column_family, begin, end);
-}
-
-Status PromoteL0(DB* db, ColumnFamilyHandle* column_family, int target_level) {
-  auto dbimpl = dynamic_cast<DBImpl*>(db);
-  if (dbimpl == nullptr) {
-    return Status::InvalidArgument("Didn't recognize DB object");
-  }
-  return dbimpl->PromoteL0(column_family, target_level);
-}
-
-#else  // ROCKSDB_LITE
-
-Status SuggestCompactRange(DB* db, ColumnFamilyHandle* column_family,
-                           const Slice* begin, const Slice* end) {
-  return Status::NotSupported("Not supported in RocksDB LITE");
-}
-
-Status PromoteL0(DB* db, ColumnFamilyHandle* column_family, int target_level) {
-  return Status::NotSupported("Not supported in RocksDB LITE");
-}
-
-#endif  // ROCKSDB_LITE
-
-Status SuggestCompactRange(DB* db, const Slice* begin, const Slice* end) {
-  return SuggestCompactRange(db, db->DefaultColumnFamily(), begin, end);
-}
-
-}  // namespace experimental
-}  // namespace rocksdb
@@ -1,937 +0,0 @@
-//  Copyright (c) 2015, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright 2014 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-// This test uses a custom Env to keep track of the state of a filesystem as of
-// the last "sync". It then checks for data loss errors by purposely dropping
-// file data (or entire files) not protected by a "sync".
-
-#include <map>
-#include <set>
-#include "db/db_impl.h"
-#include "db/filename.h"
-#include "db/log_format.h"
-#include "db/version_set.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/db.h"
-#include "rocksdb/env.h"
-#include "rocksdb/table.h"
-#include "rocksdb/write_batch.h"
-#include "util/logging.h"
-#include "util/mock_env.h"
-#include "util/mutexlock.h"
-#include "util/sync_point.h"
-#include "util/testharness.h"
-#include "util/testutil.h"
-
-namespace rocksdb {
-
-static const int kValueSize = 1000;
-static const int kMaxNumValues = 2000;
-static const size_t kNumIterations = 3;
-
-class TestWritableFile;
-class FaultInjectionTestEnv;
-
-namespace {
-
-// Assume a filename, and not a directory name like "/foo/bar/"
-static std::string GetDirName(const std::string filename) {
-  size_t found = filename.find_last_of("/\\");
-  if (found == std::string::npos) {
-    return "";
-  } else {
-    return filename.substr(0, found);
-  }
-}
-
-// Trim the tailing "/" in the end of `str`
-static std::string TrimDirname(const std::string& str) {
-  size_t found = str.find_last_not_of("/");
-  if (found == std::string::npos) {
-    return str;
-  }
-  return str.substr(0, found + 1);
-}
-
-// Return pair <parent directory name, file name> of a full path.
-static std::pair<std::string, std::string> GetDirAndName(
-    const std::string& name) {
-  std::string dirname = GetDirName(name);
-  std::string fname = name.substr(dirname.size() + 1);
-  return std::make_pair(dirname, fname);
-}
-
-// A basic file truncation function suitable for this test.
-Status Truncate(Env* env, const std::string& filename, uint64_t length) {
-  unique_ptr<SequentialFile> orig_file;
-  const EnvOptions options;
-  Status s = env->NewSequentialFile(filename, &orig_file, options);
-  if (!s.ok()) {
-    fprintf(stderr, "Cannot truncate file %s: %s\n", filename.c_str(),
-            s.ToString().c_str());
-    return s;
-  }
-
-  std::unique_ptr<char[]> scratch(new char[length]);
-  rocksdb::Slice result;
-  s = orig_file->Read(length, &result, scratch.get());
-#ifdef OS_WIN
-  orig_file.reset();
-#endif
-  if (s.ok()) {
-    std::string tmp_name = GetDirName(filename) + "/truncate.tmp";
-    unique_ptr<WritableFile> tmp_file;
-    s = env->NewWritableFile(tmp_name, &tmp_file, options);
-    if (s.ok()) {
-      s = tmp_file->Append(result);
-      if (s.ok()) {
-        s = env->RenameFile(tmp_name, filename);
-      } else {
-        fprintf(stderr, "Cannot rename file %s to %s: %s\n", tmp_name.c_str(),
-                filename.c_str(), s.ToString().c_str());
-        env->DeleteFile(tmp_name);
-      }
-    }
-  }
-  if (!s.ok()) {
-    fprintf(stderr, "Cannot truncate file %s: %s\n", filename.c_str(),
-            s.ToString().c_str());
-  }
-
-  return s;
-}
-
-struct FileState {
-  std::string filename_;
-  ssize_t pos_;
-  ssize_t pos_at_last_sync_;
-  ssize_t pos_at_last_flush_;
-
-  explicit FileState(const std::string& filename)
-      : filename_(filename),
-        pos_(-1),
-        pos_at_last_sync_(-1),
-        pos_at_last_flush_(-1) { }
-
-  FileState() : pos_(-1), pos_at_last_sync_(-1), pos_at_last_flush_(-1) {}
-
-  bool IsFullySynced() const { return pos_ <= 0 || pos_ == pos_at_last_sync_; }
-
-  Status DropUnsyncedData(Env* env) const;
-
-  Status DropRandomUnsyncedData(Env* env, Random* rand) const;
-};
-
-}  // anonymous namespace
-
-// A wrapper around WritableFileWriter* file
-// is written to or sync'ed.
-class TestWritableFile : public WritableFile {
- public:
-  explicit TestWritableFile(const std::string& fname,
-                            unique_ptr<WritableFile>&& f,
-                            FaultInjectionTestEnv* env);
-  virtual ~TestWritableFile();
-  virtual Status Append(const Slice& data) override;
-  virtual Status Close() override;
-  virtual Status Flush() override;
-  virtual Status Sync() override;
-  virtual bool IsSyncThreadSafe() const override { return true; }
-
- private:
-  FileState state_;
-  unique_ptr<WritableFile> target_;
-  bool writable_file_opened_;
-  FaultInjectionTestEnv* env_;
-};
-
-class TestDirectory : public Directory {
- public:
-  explicit TestDirectory(FaultInjectionTestEnv* env, std::string dirname,
-                         Directory* dir)
-      : env_(env), dirname_(dirname), dir_(dir) {}
-  ~TestDirectory() {}
-
-  virtual Status Fsync() override;
-
- private:
-  FaultInjectionTestEnv* env_;
-  std::string dirname_;
-  unique_ptr<Directory> dir_;
-};
-
-class FaultInjectionTestEnv : public EnvWrapper {
- public:
-  explicit FaultInjectionTestEnv(Env* base)
-      : EnvWrapper(base),
-        filesystem_active_(true) {}
-  virtual ~FaultInjectionTestEnv() { }
-
-  Status NewDirectory(const std::string& name,
-                      unique_ptr<Directory>* result) override {
-    unique_ptr<Directory> r;
-    Status s = target()->NewDirectory(name, &r);
-    EXPECT_OK(s);
-    if (!s.ok()) {
-      return s;
-    }
-    result->reset(new TestDirectory(this, TrimDirname(name), r.release()));
-    return Status::OK();
-  }
-
-  Status NewWritableFile(const std::string& fname,
-                         unique_ptr<WritableFile>* result,
-                         const EnvOptions& soptions) override {
-    if (!IsFilesystemActive()) {
-      return Status::Corruption("Not Active");
-    }
-    // Not allow overwriting files
-    Status s = target()->FileExists(fname);
-    if (s.ok()) {
-      return Status::Corruption("File already exists.");
-    } else if (!s.IsNotFound()) {
-      assert(s.IsIOError());
-      return s;
-    }
-    s = target()->NewWritableFile(fname, result, soptions);
-    if (s.ok()) {
-      result->reset(new TestWritableFile(fname, std::move(*result), this));
-      // WritableFileWriter* file is opened
-      // again then it will be truncated - so forget our saved state.
-      UntrackFile(fname);
-      MutexLock l(&mutex_);
-      open_files_.insert(fname);
-      auto dir_and_name = GetDirAndName(fname);
-      auto& list = dir_to_new_files_since_last_sync_[dir_and_name.first];
-      list.insert(dir_and_name.second);
-    }
-    return s;
-  }
-
-  virtual Status DeleteFile(const std::string& f) override {
-    if (!IsFilesystemActive()) {
-      return Status::Corruption("Not Active");
-    }
-    Status s = EnvWrapper::DeleteFile(f);
-    if (!s.ok()) {
-      fprintf(stderr, "Cannot delete file %s: %s\n", f.c_str(),
-              s.ToString().c_str());
-    }
-    EXPECT_OK(s);
-    if (s.ok()) {
-      UntrackFile(f);
-    }
-    return s;
-  }
-
-  virtual Status RenameFile(const std::string& s,
-                            const std::string& t) override {
-    if (!IsFilesystemActive()) {
-      return Status::Corruption("Not Active");
-    }
-    Status ret = EnvWrapper::RenameFile(s, t);
-
-    if (ret.ok()) {
-      MutexLock l(&mutex_);
-      if (db_file_state_.find(s) != db_file_state_.end()) {
-        db_file_state_[t] = db_file_state_[s];
-        db_file_state_.erase(s);
-      }
-
-      auto sdn = GetDirAndName(s);
-      auto tdn = GetDirAndName(t);
-      if (dir_to_new_files_since_last_sync_[sdn.first].erase(sdn.second) != 0) {
-        auto& tlist = dir_to_new_files_since_last_sync_[tdn.first];
-        assert(tlist.find(tdn.second) == tlist.end());
-        tlist.insert(tdn.second);
-      }
-    }
-
-    return ret;
-  }
-
-  void WritableFileClosed(const FileState& state) {
-    MutexLock l(&mutex_);
-    if (open_files_.find(state.filename_) != open_files_.end()) {
-      db_file_state_[state.filename_] = state;
-      open_files_.erase(state.filename_);
-    }
-  }
-
-  // For every file that is not fully synced, make a call to `func` with
-  // FileState of the file as the parameter.
-  Status DropFileData(std::function<Status(Env*, FileState)> func) {
-    Status s;
-    MutexLock l(&mutex_);
-    for (std::map<std::string, FileState>::const_iterator it =
-             db_file_state_.begin();
-         s.ok() && it != db_file_state_.end(); ++it) {
-      const FileState& state = it->second;
-      if (!state.IsFullySynced()) {
-        s = func(target(), state);
-      }
-    }
-    return s;
-  }
-
-  Status DropUnsyncedFileData() {
-    return DropFileData([&](Env* env, const FileState& state) {
-      return state.DropUnsyncedData(env);
-    });
-  }
-
-  Status DropRandomUnsyncedFileData(Random* rnd) {
-    return DropFileData([&](Env* env, const FileState& state) {
-      return state.DropRandomUnsyncedData(env, rnd);
-    });
-  }
-
-  Status DeleteFilesCreatedAfterLastDirSync() {
-    // Because DeleteFile access this container make a copy to avoid deadlock
-    std::map<std::string, std::set<std::string>> map_copy;
-    {
-      MutexLock l(&mutex_);
-      map_copy.insert(dir_to_new_files_since_last_sync_.begin(),
-                      dir_to_new_files_since_last_sync_.end());
-    }
-
-    for (auto& pair : map_copy) {
-      for (std::string name : pair.second) {
-        Status s = DeleteFile(pair.first + "/" + name);
-        if (!s.ok()) {
-          return s;
-        }
-      }
-    }
-    return Status::OK();
-  }
-  void ResetState() {
-    MutexLock l(&mutex_);
-    db_file_state_.clear();
-    dir_to_new_files_since_last_sync_.clear();
-    SetFilesystemActiveNoLock(true);
-  }
-
-  void UntrackFile(const std::string& f) {
-    MutexLock l(&mutex_);
-    auto dir_and_name = GetDirAndName(f);
-    dir_to_new_files_since_last_sync_[dir_and_name.first].erase(
-        dir_and_name.second);
-    db_file_state_.erase(f);
-    open_files_.erase(f);
-  }
-
-  void SyncDir(const std::string& dirname) {
-    MutexLock l(&mutex_);
-    dir_to_new_files_since_last_sync_.erase(dirname);
-  }
-
-  // Setting the filesystem to inactive is the test equivalent to simulating a
-  // system reset. Setting to inactive will freeze our saved filesystem state so
-  // that it will stop being recorded. It can then be reset back to the state at
-  // the time of the reset.
-  bool IsFilesystemActive() {
-    MutexLock l(&mutex_);
-    return filesystem_active_;
-  }
-  void SetFilesystemActiveNoLock(bool active) { filesystem_active_ = active; }
-  void SetFilesystemActive(bool active) {
-    MutexLock l(&mutex_);
-    SetFilesystemActiveNoLock(active);
-  }
-  void AssertNoOpenFile() { ASSERT_TRUE(open_files_.empty()); }
-
- private:
-  port::Mutex mutex_;
-  std::map<std::string, FileState> db_file_state_;
-  std::set<std::string> open_files_;
-  std::unordered_map<std::string, std::set<std::string>>
-      dir_to_new_files_since_last_sync_;
-  bool filesystem_active_;  // Record flushes, syncs, writes
-};
-
-Status FileState::DropUnsyncedData(Env* env) const {
-  ssize_t sync_pos = pos_at_last_sync_ == -1 ? 0 : pos_at_last_sync_;
-  return Truncate(env, filename_, sync_pos);
-}
-
-Status FileState::DropRandomUnsyncedData(Env* env, Random* rand) const {
-  ssize_t sync_pos = pos_at_last_sync_ == -1 ? 0 : pos_at_last_sync_;
-  assert(pos_ >= sync_pos);
-  int range = static_cast<int>(pos_ - sync_pos);
-  uint64_t truncated_size =
-      static_cast<uint64_t>(sync_pos) + rand->Uniform(range);
-  return Truncate(env, filename_, truncated_size);
-}
-
-Status TestDirectory::Fsync() {
-  env_->SyncDir(dirname_);
-  return dir_->Fsync();
-}
-
-TestWritableFile::TestWritableFile(const std::string& fname,
-                                   unique_ptr<WritableFile>&& f,
-                                   FaultInjectionTestEnv* env)
-      : state_(fname),
-        target_(std::move(f)),
-        writable_file_opened_(true),
-        env_(env) {
-  assert(target_ != nullptr);
-  state_.pos_ = 0;
-}
-
-TestWritableFile::~TestWritableFile() {
-  if (writable_file_opened_) {
-    Close();
-  }
-}
-
-Status TestWritableFile::Append(const Slice& data) {
-  if (!env_->IsFilesystemActive()) {
-    return Status::Corruption("Not Active");
-  }
-  Status s = target_->Append(data);
-  if (s.ok()) {
-    state_.pos_ += data.size();
-  }
-  return s;
-}
-
-Status TestWritableFile::Close() {
-  writable_file_opened_ = false;
-  Status s = target_->Close();
-  if (s.ok()) {
-    env_->WritableFileClosed(state_);
-  }
-  return s;
-}
-
-Status TestWritableFile::Flush() {
-  Status s = target_->Flush();
-  if (s.ok() && env_->IsFilesystemActive()) {
-    state_.pos_at_last_flush_ = state_.pos_;
-  }
-  return s;
-}
-
-Status TestWritableFile::Sync() {
-  if (!env_->IsFilesystemActive()) {
-    return Status::OK();
-  }
-  // No need to actual sync.
-  state_.pos_at_last_sync_ = state_.pos_;
-  return Status::OK();
-}
-
-class FaultInjectionTest : public testing::Test,
-                           public testing::WithParamInterface<bool> {
- protected:
-  enum OptionConfig {
-    kDefault,
-    kDifferentDataDir,
-    kWalDir,
-    kSyncWal,
-    kWalDirSyncWal,
-    kMultiLevels,
-    kEnd,
-  };
-  int option_config_;
-  // When need to make sure data is persistent, sync WAL
-  bool sync_use_wal_;
-  // When need to make sure data is persistent, call DB::CompactRange()
-  bool sync_use_compact_;
-
-  bool sequential_order_;
-
- protected:
- public:
-  enum ExpectedVerifResult { kValExpectFound, kValExpectNoError };
-  enum ResetMethod {
-    kResetDropUnsyncedData,
-    kResetDropRandomUnsyncedData,
-    kResetDeleteUnsyncedFiles,
-    kResetDropAndDeleteUnsynced
-  };
-
-  std::unique_ptr<Env> base_env_;
-  FaultInjectionTestEnv* env_;
-  std::string dbname_;
-  shared_ptr<Cache> tiny_cache_;
-  Options options_;
-  DB* db_;
-
-  FaultInjectionTest()
-      : option_config_(kDefault),
-        sync_use_wal_(false),
-        sync_use_compact_(true),
-        base_env_(nullptr),
-        env_(NULL),
-        db_(NULL) {
-  }
-
-  ~FaultInjectionTest() {
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-    rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
-  }
-
-  bool ChangeOptions() {
-    option_config_++;
-    if (option_config_ >= kEnd) {
-      return false;
-    } else {
-      if (option_config_ == kMultiLevels) {
-        base_env_.reset(new MockEnv(Env::Default()));
-      }
-      return true;
-    }
-  }
-
-  // Return the current option configuration.
-  Options CurrentOptions() {
-    sync_use_wal_ = false;
-    sync_use_compact_ = true;
-    Options options;
-    switch (option_config_) {
-      case kWalDir:
-        options.wal_dir = test::TmpDir(env_) + "/fault_test_wal";
-        break;
-      case kDifferentDataDir:
-        options.db_paths.emplace_back(test::TmpDir(env_) + "/fault_test_data",
-                                      1000000U);
-        break;
-      case kSyncWal:
-        sync_use_wal_ = true;
-        sync_use_compact_ = false;
-        break;
-      case kWalDirSyncWal:
-        options.wal_dir = test::TmpDir(env_) + "/fault_test_wal";
-        sync_use_wal_ = true;
-        sync_use_compact_ = false;
-        break;
-      case kMultiLevels:
-        options.write_buffer_size = 64 * 1024;
-        options.target_file_size_base = 64 * 1024;
-        options.level0_file_num_compaction_trigger = 2;
-        options.level0_slowdown_writes_trigger = 2;
-        options.level0_stop_writes_trigger = 4;
-        options.max_bytes_for_level_base = 128 * 1024;
-        options.max_write_buffer_number = 2;
-        options.max_background_compactions = 8;
-        options.max_background_flushes = 8;
-        sync_use_wal_ = true;
-        sync_use_compact_ = false;
-        break;
-      default:
-        break;
-    }
-    return options;
-  }
-
-  Status NewDB() {
-    assert(db_ == NULL);
-    assert(tiny_cache_ == nullptr);
-    assert(env_ == NULL);
-
-    env_ =
-        new FaultInjectionTestEnv(base_env_ ? base_env_.get() : Env::Default());
-
-    options_ = CurrentOptions();
-    options_.env = env_;
-    options_.paranoid_checks = true;
-
-    BlockBasedTableOptions table_options;
-    tiny_cache_ = NewLRUCache(100);
-    table_options.block_cache = tiny_cache_;
-    options_.table_factory.reset(NewBlockBasedTableFactory(table_options));
-
-    dbname_ = test::TmpDir() + "/fault_test";
-
-    EXPECT_OK(DestroyDB(dbname_, options_));
-
-    options_.create_if_missing = true;
-    Status s = OpenDB();
-    options_.create_if_missing = false;
-    return s;
-  }
-
-  void SetUp() override {
-    sequential_order_ = GetParam();
-    ASSERT_OK(NewDB());
-  }
-
-  void TearDown() override {
-    CloseDB();
-
-    Status s = DestroyDB(dbname_, options_);
-
-    delete env_;
-    env_ = NULL;
-
-    tiny_cache_.reset();
-
-    ASSERT_OK(s);
-  }
-
-  void Build(const WriteOptions& write_options, int start_idx, int num_vals) {
-    std::string key_space, value_space;
-    WriteBatch batch;
-    for (int i = start_idx; i < start_idx + num_vals; i++) {
-      Slice key = Key(i, &key_space);
-      batch.Clear();
-      batch.Put(key, Value(i, &value_space));
-      ASSERT_OK(db_->Write(write_options, &batch));
-    }
-  }
-
-  Status ReadValue(int i, std::string* val) const {
-    std::string key_space, value_space;
-    Slice key = Key(i, &key_space);
-    Value(i, &value_space);
-    ReadOptions options;
-    return db_->Get(options, key, val);
-  }
-
-  Status Verify(int start_idx, int num_vals,
-                ExpectedVerifResult expected) const {
-    std::string val;
-    std::string value_space;
-    Status s;
-    for (int i = start_idx; i < start_idx + num_vals && s.ok(); i++) {
-      Value(i, &value_space);
-      s = ReadValue(i, &val);
-      if (s.ok()) {
-        EXPECT_EQ(value_space, val);
-      }
-      if (expected == kValExpectFound) {
-        if (!s.ok()) {
-          fprintf(stderr, "Error when read %dth record (expect found): %s\n", i,
-                  s.ToString().c_str());
-          return s;
-        }
-      } else if (!s.ok() && !s.IsNotFound()) {
-        fprintf(stderr, "Error when read %dth record: %s\n", i,
-                s.ToString().c_str());
-        return s;
-      }
-    }
-    return Status::OK();
-  }
-
-  // Return the ith key
-  Slice Key(int i, std::string* storage) const {
-    int num = i;
-    if (!sequential_order_) {
-      // random transfer
-      const int m = 0x5bd1e995;
-      num *= m;
-      num ^= num << 24;
-    }
-    char buf[100];
-    snprintf(buf, sizeof(buf), "%016d", num);
-    storage->assign(buf, strlen(buf));
-    return Slice(*storage);
-  }
-
-  // Return the value to associate with the specified key
-  Slice Value(int k, std::string* storage) const {
-    Random r(k);
-    return test::RandomString(&r, kValueSize, storage);
-  }
-
-  Status OpenDB() {
-    delete db_;
-    db_ = NULL;
-    env_->ResetState();
-    return DB::Open(options_, dbname_, &db_);
-  }
-
-  void CloseDB() {
-    delete db_;
-    db_ = NULL;
-  }
-
-  void DeleteAllData() {
-    Iterator* iter = db_->NewIterator(ReadOptions());
-    WriteOptions options;
-    for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
-      ASSERT_OK(db_->Delete(WriteOptions(), iter->key()));
-    }
-
-    delete iter;
-
-    FlushOptions flush_options;
-    flush_options.wait = true;
-    db_->Flush(flush_options);
-  }
-
-  // rnd cannot be null for kResetDropRandomUnsyncedData
-  void ResetDBState(ResetMethod reset_method, Random* rnd = nullptr) {
-    env_->AssertNoOpenFile();
-    switch (reset_method) {
-      case kResetDropUnsyncedData:
-        ASSERT_OK(env_->DropUnsyncedFileData());
-        break;
-      case kResetDropRandomUnsyncedData:
-        ASSERT_OK(env_->DropRandomUnsyncedFileData(rnd));
-        break;
-      case kResetDeleteUnsyncedFiles:
-        ASSERT_OK(env_->DeleteFilesCreatedAfterLastDirSync());
-        break;
-      case kResetDropAndDeleteUnsynced:
-        ASSERT_OK(env_->DropUnsyncedFileData());
-        ASSERT_OK(env_->DeleteFilesCreatedAfterLastDirSync());
-        break;
-      default:
-        assert(false);
-    }
-  }
-
-  void PartialCompactTestPreFault(int num_pre_sync, int num_post_sync) {
-    DeleteAllData();
-
-    WriteOptions write_options;
-    write_options.sync = sync_use_wal_;
-
-    Build(write_options, 0, num_pre_sync);
-    if (sync_use_compact_) {
-      db_->CompactRange(CompactRangeOptions(), nullptr, nullptr);
-    }
-    write_options.sync = false;
-    Build(write_options, num_pre_sync, num_post_sync);
-  }
-
-  void PartialCompactTestReopenWithFault(ResetMethod reset_method,
-                                         int num_pre_sync, int num_post_sync,
-                                         Random* rnd = nullptr) {
-    env_->SetFilesystemActive(false);
-    CloseDB();
-    ResetDBState(reset_method, rnd);
-    ASSERT_OK(OpenDB());
-    ASSERT_OK(Verify(0, num_pre_sync, FaultInjectionTest::kValExpectFound));
-    ASSERT_OK(Verify(num_pre_sync, num_post_sync,
-                     FaultInjectionTest::kValExpectNoError));
-    WaitCompactionFinish();
-    ASSERT_OK(Verify(0, num_pre_sync, FaultInjectionTest::kValExpectFound));
-    ASSERT_OK(Verify(num_pre_sync, num_post_sync,
-                     FaultInjectionTest::kValExpectNoError));
-  }
-
-  void NoWriteTestPreFault() {
-  }
-
-  void NoWriteTestReopenWithFault(ResetMethod reset_method) {
-    CloseDB();
-    ResetDBState(reset_method);
-    ASSERT_OK(OpenDB());
-  }
-
-  void WaitCompactionFinish() {
-    static_cast<DBImpl*>(db_)->TEST_WaitForCompact();
-    ASSERT_OK(db_->Put(WriteOptions(), "", ""));
-  }
-};
-
-TEST_P(FaultInjectionTest, FaultTest) {
-  do {
-    Random rnd(301);
-
-    for (size_t idx = 0; idx < kNumIterations; idx++) {
-      int num_pre_sync = rnd.Uniform(kMaxNumValues);
-      int num_post_sync = rnd.Uniform(kMaxNumValues);
-
-      PartialCompactTestPreFault(num_pre_sync, num_post_sync);
-      PartialCompactTestReopenWithFault(kResetDropUnsyncedData, num_pre_sync,
-                                        num_post_sync);
-      NoWriteTestPreFault();
-      NoWriteTestReopenWithFault(kResetDropUnsyncedData);
-
-      PartialCompactTestPreFault(num_pre_sync, num_post_sync);
-      PartialCompactTestReopenWithFault(kResetDropRandomUnsyncedData,
-                                        num_pre_sync, num_post_sync, &rnd);
-      NoWriteTestPreFault();
-      NoWriteTestReopenWithFault(kResetDropUnsyncedData);
-
-      // Setting a separate data path won't pass the test as we don't sync
-      // it after creating new files,
-      PartialCompactTestPreFault(num_pre_sync, num_post_sync);
-      PartialCompactTestReopenWithFault(kResetDropAndDeleteUnsynced,
-                                        num_pre_sync, num_post_sync);
-      NoWriteTestPreFault();
-      NoWriteTestReopenWithFault(kResetDropAndDeleteUnsynced);
-
-      PartialCompactTestPreFault(num_pre_sync, num_post_sync);
-      // No new files created so we expect all values since no files will be
-      // dropped.
-      PartialCompactTestReopenWithFault(kResetDeleteUnsyncedFiles, num_pre_sync,
-                                        num_post_sync);
-      NoWriteTestPreFault();
-      NoWriteTestReopenWithFault(kResetDeleteUnsyncedFiles);
-    }
-  } while (ChangeOptions());
-}
-
-class SleepingBackgroundTask {
- public:
-  SleepingBackgroundTask()
-      : bg_cv_(&mutex_), should_sleep_(true), done_with_sleep_(false) {}
-  void DoSleep() {
-    MutexLock l(&mutex_);
-    while (should_sleep_) {
-      bg_cv_.Wait();
-    }
-    done_with_sleep_ = true;
-    bg_cv_.SignalAll();
-  }
-  void WakeUp() {
-    MutexLock l(&mutex_);
-    should_sleep_ = false;
-    bg_cv_.SignalAll();
-    while (!done_with_sleep_) {
-      bg_cv_.Wait();
-    }
-  }
-
-  static void DoSleepTask(void* arg) {
-    reinterpret_cast<SleepingBackgroundTask*>(arg)->DoSleep();
-  }
-
- private:
-  port::Mutex mutex_;
-  port::CondVar bg_cv_;  // Signalled when background work finishes
-  bool should_sleep_;
-  bool done_with_sleep_;
-};
-
-// Previous log file is not fsynced if sync is forced after log rolling.
-TEST_P(FaultInjectionTest, WriteOptionSyncTest) {
-  SleepingBackgroundTask sleeping_task_low;
-  env_->SetBackgroundThreads(1, Env::HIGH);
-  // Block the job queue to prevent flush job from running.
-  env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
-                 Env::Priority::HIGH);
-
-  WriteOptions write_options;
-  write_options.sync = false;
-
-  std::string key_space, value_space;
-  ASSERT_OK(
-      db_->Put(write_options, Key(1, &key_space), Value(1, &value_space)));
-  FlushOptions flush_options;
-  flush_options.wait = false;
-  ASSERT_OK(db_->Flush(flush_options));
-  write_options.sync = true;
-  ASSERT_OK(
-      db_->Put(write_options, Key(2, &key_space), Value(2, &value_space)));
-
-  env_->SetFilesystemActive(false);
-  NoWriteTestReopenWithFault(kResetDropAndDeleteUnsynced);
-  sleeping_task_low.WakeUp();
-
-  ASSERT_OK(OpenDB());
-  std::string val;
-  Value(2, &value_space);
-  ASSERT_OK(ReadValue(2, &val));
-  ASSERT_EQ(value_space, val);
-
-  Value(1, &value_space);
-  ASSERT_OK(ReadValue(1, &val));
-  ASSERT_EQ(value_space, val);
-}
-
-TEST_P(FaultInjectionTest, UninstalledCompaction) {
-  options_.target_file_size_base = 32 * 1024;
-  options_.write_buffer_size = 100 << 10;  // 100KB
-  options_.level0_file_num_compaction_trigger = 6;
-  options_.level0_stop_writes_trigger = 1 << 10;
-  options_.level0_slowdown_writes_trigger = 1 << 10;
-  options_.max_background_compactions = 1;
-  OpenDB();
-
-  if (!sequential_order_) {
-    rocksdb::SyncPoint::GetInstance()->LoadDependency({
-        {"FaultInjectionTest::FaultTest:0", "DBImpl::BGWorkCompaction"},
-        {"CompactionJob::Run():End", "FaultInjectionTest::FaultTest:1"},
-        {"FaultInjectionTest::FaultTest:2",
-         "DBImpl::BackgroundCompaction:NonTrivial:AfterRun"},
-    });
-  }
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-  int kNumKeys = 1000;
-  Build(WriteOptions(), 0, kNumKeys);
-  FlushOptions flush_options;
-  flush_options.wait = true;
-  db_->Flush(flush_options);
-  ASSERT_OK(db_->Put(WriteOptions(), "", ""));
-  TEST_SYNC_POINT("FaultInjectionTest::FaultTest:0");
-  TEST_SYNC_POINT("FaultInjectionTest::FaultTest:1");
-  env_->SetFilesystemActive(false);
-  TEST_SYNC_POINT("FaultInjectionTest::FaultTest:2");
-  CloseDB();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  ResetDBState(kResetDropUnsyncedData);
-
-  std::atomic<bool> opened(false);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "DBImpl::Open:Opened", [&](void* arg) { opened.store(true); });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "DBImpl::BGWorkCompaction",
-      [&](void* arg) { ASSERT_TRUE(opened.load()); });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  ASSERT_OK(OpenDB());
-  ASSERT_OK(Verify(0, kNumKeys, FaultInjectionTest::kValExpectFound));
-  WaitCompactionFinish();
-  ASSERT_OK(Verify(0, kNumKeys, FaultInjectionTest::kValExpectFound));
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
-}
-
-TEST_P(FaultInjectionTest, ManualLogSyncTest) {
-  SleepingBackgroundTask sleeping_task_low;
-  env_->SetBackgroundThreads(1, Env::HIGH);
-  // Block the job queue to prevent flush job from running.
-  env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
-                 Env::Priority::HIGH);
-
-  WriteOptions write_options;
-  write_options.sync = false;
-
-  std::string key_space, value_space;
-  ASSERT_OK(
-      db_->Put(write_options, Key(1, &key_space), Value(1, &value_space)));
-  FlushOptions flush_options;
-  flush_options.wait = false;
-  ASSERT_OK(db_->Flush(flush_options));
-  ASSERT_OK(
-      db_->Put(write_options, Key(2, &key_space), Value(2, &value_space)));
-  ASSERT_OK(db_->SyncWAL());
-
-  env_->SetFilesystemActive(false);
-  NoWriteTestReopenWithFault(kResetDropAndDeleteUnsynced);
-  sleeping_task_low.WakeUp();
-
-  ASSERT_OK(OpenDB());
-  std::string val;
-  Value(2, &value_space);
-  ASSERT_OK(ReadValue(2, &val));
-  ASSERT_EQ(value_space, val);
-
-  Value(1, &value_space);
-  ASSERT_OK(ReadValue(1, &val));
-  ASSERT_EQ(value_space, val);
-}
-
-INSTANTIATE_TEST_CASE_P(FaultTest, FaultInjectionTest, ::testing::Bool());
-
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -17,19 +17,17 @@ namespace rocksdb {
 FileIndexer::FileIndexer(const Comparator* ucmp)
    : num_levels_(0), ucmp_(ucmp), level_rb_(nullptr) {}

-size_t FileIndexer::NumLevelIndex() const { return next_level_index_.size(); }
+uint32_t FileIndexer::NumLevelIndex() const {
+  return next_level_index_.size();
+}

-size_t FileIndexer::LevelIndexSize(size_t level) const {
-  if (level >= next_level_index_.size()) {
-    return 0;
-  }
+uint32_t FileIndexer::LevelIndexSize(uint32_t level) const {
  return next_level_index_[level].num_index;
 }

-void FileIndexer::GetNextLevelIndex(const size_t level, const size_t file_index,
-                                    const int cmp_smallest,
-                                    const int cmp_largest, int32_t* left_bound,
-                                    int32_t* right_bound) const {
+void FileIndexer::GetNextLevelIndex(
+    const uint32_t level, const uint32_t file_index, const int cmp_smallest,
+    const int cmp_largest, int32_t* left_bound, int32_t* right_bound) const {
  assert(level > 0);

  // Last level, no hint
@@ -71,7 +69,7 @@ void FileIndexer::GetNextLevelIndex(const size_t level, const size_t file_index,
  assert(*right_bound <= level_rb_[level + 1]);
 }

-void FileIndexer::UpdateIndex(Arena* arena, const size_t num_levels,
+void FileIndexer::UpdateIndex(Arena* arena, const uint32_t num_levels,
                              std::vector<FileMetaData*>* const files) {
  if (files == nullptr) {
    return;
@@ -92,11 +90,11 @@ void FileIndexer::UpdateIndex(Arena* arena, const size_t num_levels,
  }

  // L1 - Ln-1
-  for (size_t level = 1; level < num_levels_ - 1; ++level) {
+  for (uint32_t level = 1; level < num_levels_ - 1; ++level) {
    const auto& upper_files = files[level];
-    const int32_t upper_size = static_cast<int32_t>(upper_files.size());
+    const int32_t upper_size = upper_files.size();
    const auto& lower_files = files[level + 1];
-    level_rb_[level] = static_cast<int32_t>(upper_files.size()) - 1;
+    level_rb_[level] = upper_files.size() - 1;
    if (upper_size == 0) {
      continue;
    }
@@ -131,8 +129,7 @@ void FileIndexer::UpdateIndex(Arena* arena, const size_t num_levels,
        [](IndexUnit* index, int32_t f_idx) { index->largest_rb = f_idx; });
  }

-  level_rb_[num_levels_ - 1] =
-      static_cast<int32_t>(files[num_levels_ - 1].size()) - 1;
+  level_rb_[num_levels_ - 1] = files[num_levels_ - 1].size() - 1;
 }

 void FileIndexer::CalculateLB(
@@ -140,8 +137,8 @@ void FileIndexer::CalculateLB(
    const std::vector<FileMetaData*>& lower_files, IndexLevel* index_level,
    std::function<int(const FileMetaData*, const FileMetaData*)> cmp_op,
    std::function<void(IndexUnit*, int32_t)> set_index) {
-  const int32_t upper_size = static_cast<int32_t>(upper_files.size());
-  const int32_t lower_size = static_cast<int32_t>(lower_files.size());
+  const int32_t upper_size = upper_files.size();
+  const int32_t lower_size = lower_files.size();
  int32_t upper_idx = 0;
  int32_t lower_idx = 0;

@@ -178,8 +175,8 @@ void FileIndexer::CalculateRB(
    const std::vector<FileMetaData*>& lower_files, IndexLevel* index_level,
    std::function<int(const FileMetaData*, const FileMetaData*)> cmp_op,
    std::function<void(IndexUnit*, int32_t)> set_index) {
-  const int32_t upper_size = static_cast<int32_t>(upper_files.size());
-  const int32_t lower_size = static_cast<int32_t>(lower_files.size());
+  const int32_t upper_size = upper_files.size();
+  const int32_t lower_size = lower_files.size();
  int32_t upper_idx = upper_size - 1;
  int32_t lower_idx = lower_size - 1;

@@ -12,7 +12,6 @@
 #include <functional>
 #include <limits>
 #include <vector>
-#include "port/port.h"
 #include "util/arena.h"
 #include "util/autovector.h"

@@ -43,28 +42,27 @@ class FileIndexer {
 public:
  explicit FileIndexer(const Comparator* ucmp);

-  size_t NumLevelIndex() const;
+  uint32_t NumLevelIndex() const;

-  size_t LevelIndexSize(size_t level) const;
+  uint32_t LevelIndexSize(uint32_t level) const;

  // Return a file index range in the next level to search for a key based on
  // smallest and largest key comparision for the current file specified by
  // level and file_index. When *left_index < *right_index, both index should
  // be valid and fit in the vector size.
-  void GetNextLevelIndex(const size_t level, const size_t file_index,
-                         const int cmp_smallest, const int cmp_largest,
-                         int32_t* left_bound, int32_t* right_bound) const;
+  void GetNextLevelIndex(
+    const uint32_t level, const uint32_t file_index, const int cmp_smallest,
+    const int cmp_largest, int32_t* left_bound, int32_t* right_bound) const;

-  void UpdateIndex(Arena* arena, const size_t num_levels,
+  void UpdateIndex(Arena* arena, const uint32_t num_levels,
                   std::vector<FileMetaData*>* const files);

  enum {
-    // MSVC version 1800 still does not have constexpr for ::max()
-    kLevelMaxIndex = rocksdb::port::kMaxInt32
+    kLevelMaxIndex = std::numeric_limits<int32_t>::max()
  };

 private:
-  size_t num_levels_;
+  uint32_t num_levels_;
  const Comparator* ucmp_;

  struct IndexUnit {
@@ -11,7 +11,6 @@
 #include "db/file_indexer.h"
 #include "db/dbformat.h"
 #include "db/version_edit.h"
-#include "port/stack_trace.h"
 #include "rocksdb/comparator.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
@@ -20,29 +19,23 @@ namespace rocksdb {

 class IntComparator : public Comparator {
 public:
-  int Compare(const Slice& a, const Slice& b) const override {
+  int Compare(const Slice& a, const Slice& b) const {
    assert(a.size() == 8);
    assert(b.size() == 8);
-    int64_t diff = *reinterpret_cast<const int64_t*>(a.data()) -
-                   *reinterpret_cast<const int64_t*>(b.data());
-    if (diff < 0) {
-      return -1;
-    } else if (diff == 0) {
-      return 0;
-    } else {
-      return 1;
-    }
+    return *reinterpret_cast<const int64_t*>(a.data()) -
+      *reinterpret_cast<const int64_t*>(b.data());
  }

-  const char* Name() const override { return "IntComparator"; }
+  const char* Name() const {
+    return "IntComparator";
+  }

-  void FindShortestSeparator(std::string* start,
-                             const Slice& limit) const override {}
+  void FindShortestSeparator(std::string* start, const Slice& limit) const {}

-  void FindShortSuccessor(std::string* key) const override {}
+  void FindShortSuccessor(std::string* key) const {}
 };

-class FileIndexerTest : public testing::Test {
+struct FileIndexerTest {
 public:
  FileIndexerTest()
      : kNumLevels(4), files(new std::vector<FileMetaData*>[kNumLevels]) {}
@@ -91,7 +84,7 @@ class FileIndexerTest : public testing::Test {
 };

 // Case 0: Empty
-TEST_F(FileIndexerTest, Empty) {
+TEST(FileIndexerTest, Empty) {
  Arena arena;
  indexer = new FileIndexer(&ucmp);
  indexer->UpdateIndex(&arena, 0, files);
@@ -99,7 +92,7 @@ TEST_F(FileIndexerTest, Empty) {
 }

 // Case 1: no overlap, files are on the left of next level files
-TEST_F(FileIndexerTest, no_overlap_left) {
+TEST(FileIndexerTest, no_overlap_left) {
  Arena arena;
  indexer = new FileIndexer(&ucmp);
  // level 1
@@ -139,7 +132,7 @@ TEST_F(FileIndexerTest, no_overlap_left) {
 }

 // Case 2: no overlap, files are on the right of next level files
-TEST_F(FileIndexerTest, no_overlap_right) {
+TEST(FileIndexerTest, no_overlap_right) {
  Arena arena;
  indexer = new FileIndexer(&ucmp);
  // level 1
@@ -181,7 +174,7 @@ TEST_F(FileIndexerTest, no_overlap_right) {
 }

 // Case 3: empty L2
-TEST_F(FileIndexerTest, empty_L2) {
+TEST(FileIndexerTest, empty_L2) {
  Arena arena;
  indexer = new FileIndexer(&ucmp);
  for (uint32_t i = 1; i < kNumLevels; ++i) {
@@ -221,7 +214,7 @@ TEST_F(FileIndexerTest, empty_L2) {
 }

 // Case 4: mixed
-TEST_F(FileIndexerTest, mixed) {
+TEST(FileIndexerTest, mixed) {
  Arena arena;
  indexer = new FileIndexer(&ucmp);
  // level 1
@@ -344,7 +337,5 @@ TEST_F(FileIndexerTest, mixed) {
 }  // namespace rocksdb

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+  return rocksdb::test::RunAllTests();
 }
@@ -18,9 +18,7 @@
 #include <vector>
 #include "db/dbformat.h"
 #include "rocksdb/env.h"
-#include "util/file_reader_writer.h"
 #include "util/logging.h"
-#include "util/stop_watch.h"

 namespace rocksdb {

@@ -81,17 +79,6 @@ std::string MakeTableFileName(const std::string& path, uint64_t number) {
  return MakeFileName(path, number, "sst");
 }

-uint64_t TableFileNameToNumber(const std::string& name) {
-  uint64_t number = 0;
-  uint64_t base = 1;
-  int pos = static_cast<int>(name.find_last_of('.'));
-  while (--pos >= 0 && name[pos] >= '0' && name[pos] <= '9') {
-    number += (name[pos] - '0') * base;
-    base *= 10;
-  }
-  return number;
-}
-
 std::string TableFileName(const std::vector<DbPath>& db_paths, uint64_t number,
                          uint32_t path_id) {
  assert(number > 0);
@@ -104,6 +91,8 @@ std::string TableFileName(const std::vector<DbPath>& db_paths, uint64_t number,
  return MakeTableFileName(path, number);
 }

+const size_t kFormatFileNumberBufSize = 38;
+
 void FormatFileNumber(uint64_t number, uint32_t path_id, char* out_buf,
                      size_t out_buf_size) {
  if (path_id == 0) {
@@ -329,14 +318,4 @@ Status SetIdentityFile(Env* env, const std::string& dbname) {
  return s;
 }

-Status SyncManifest(Env* env, const DBOptions* db_options,
-                    WritableFileWriter* file) {
-  if (db_options->disableDataSync) {
-    return Status::OK();
-  } else {
-    StopWatch sw(env, db_options->statistics.get(), MANIFEST_FILE_SYNC_MICROS);
-    return file->Sync(db_options->use_fsync);
-  }
-}
-
 }  // namespace rocksdb
@@ -14,18 +14,15 @@
 #include <unordered_map>
 #include <string>
 #include <vector>
-
-#include "port/port.h"
-#include "rocksdb/options.h"
 #include "rocksdb/slice.h"
 #include "rocksdb/status.h"
 #include "rocksdb/transaction_log.h"
+#include "port/port.h"

 namespace rocksdb {

 class Env;
 class Directory;
-class WritableFileWriter;

 enum FileType {
  kLogFile,
@@ -39,6 +36,9 @@ enum FileType {
  kIdentityFile
 };

+// map from file number to path ID.
+typedef std::unordered_map<uint64_t, uint32_t> FileNumToPathIdMap;
+
 // Return the name of the log file with the specified number
 // in the db named by "dbname".  The result will be prefixed with
 // "dbname".
@@ -55,10 +55,6 @@ extern std::string ArchivedLogFileName(const std::string& dbname,

 extern std::string MakeTableFileName(const std::string& name, uint64_t number);

-// the reverse function of MakeTableFileName
-// TODO(yhchiang): could merge this function with ParseFileName()
-extern uint64_t TableFileNameToNumber(const std::string& name);
-
 // Return the name of the sstable with the specified number
 // in the db named by "dbname".  The result will be prefixed with
 // "dbname".
@@ -66,7 +62,7 @@ extern std::string TableFileName(const std::vector<DbPath>& db_paths,
                                 uint64_t number, uint32_t path_id);

 // Sufficient buffer size for FormatFileNumber.
-const size_t kFormatFileNumberBufSize = 38;
+extern const size_t kFormatFileNumberBufSize;

 extern void FormatFileNumber(uint64_t number, uint32_t path_id, char* out_buf,
                             size_t out_buf_size);
@@ -138,8 +134,4 @@ extern Status SetCurrentFile(Env* env, const std::string& dbname,
 // Make the IDENTITY file for the db
 extern Status SetIdentityFile(Env* env, const std::string& dbname);

-// Sync manifest file `file`.
-extern Status SyncManifest(Env* env, const DBOptions* db_options,
-                           WritableFileWriter* file);
-
 }  // namespace rocksdb
@@ -16,9 +16,9 @@

 namespace rocksdb {

-class FileNameTest : public testing::Test {};
+class FileNameTest { };

-TEST_F(FileNameTest, Parse) {
+TEST(FileNameTest, Parse) {
  Slice db;
  FileType type;
  uint64_t number;
@@ -105,7 +105,7 @@ TEST_F(FileNameTest, Parse) {
  };
 }

-TEST_F(FileNameTest, InfoLogFileName) {
+TEST(FileNameTest, InfoLogFileName) {
  std::string dbname = ("/data/rocksdb");
  std::string db_absolute_path;
  Env::Default()->GetAbsolutePath(dbname, &db_absolute_path);
@@ -121,7 +121,7 @@ TEST_F(FileNameTest, InfoLogFileName) {
      OldInfoLogFileName(dbname, 666u, db_absolute_path, "/data/rocksdb_log"));
 }

-TEST_F(FileNameTest, Construction) {
+TEST(FileNameTest, Construction) {
  uint64_t number;
  FileType type;
  std::string fname;
@@ -175,6 +175,5 @@ TEST_F(FileNameTest, Construction) {
 }  // namespace rocksdb

 int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+  return rocksdb::test::RunAllTests();
 }
@@ -20,7 +20,6 @@
 #include "db/builder.h"
 #include "db/db_iter.h"
 #include "db/dbformat.h"
-#include "db/event_helpers.h"
 #include "db/filename.h"
 #include "db/log_reader.h"
 #include "db/log_writer.h"
@@ -41,8 +40,6 @@
 #include "table/table_builder.h"
 #include "table/two_level_iterator.h"
 #include "util/coding.h"
-#include "util/event_logger.h"
-#include "util/file_util.h"
 #include "util/logging.h"
 #include "util/log_buffer.h"
 #include "util/mutexlock.h"
@@ -50,7 +47,6 @@
 #include "util/iostats_context_imp.h"
 #include "util/stop_watch.h"
 #include "util/sync_point.h"
-#include "util/thread_status_util.h"

 namespace rocksdb {

@@ -58,13 +54,11 @@ FlushJob::FlushJob(const std::string& dbname, ColumnFamilyData* cfd,
                   const DBOptions& db_options,
                   const MutableCFOptions& mutable_cf_options,
                   const EnvOptions& env_options, VersionSet* versions,
-                   InstrumentedMutex* db_mutex,
-                   std::atomic<bool>* shutting_down,
+                   port::Mutex* db_mutex, std::atomic<bool>* shutting_down,
+                   FileNumToPathIdMap* pending_outputs,
                   SequenceNumber newest_snapshot, JobContext* job_context,
                   LogBuffer* log_buffer, Directory* db_directory,
-                   Directory* output_file_directory,
-                   CompressionType output_compression, Statistics* stats,
-                   EventLogger* event_logger)
+                   CompressionType output_compression, Statistics* stats)
    : dbname_(dbname),
      cfd_(cfd),
      db_options_(db_options),
@@ -73,54 +67,17 @@ FlushJob::FlushJob(const std::string& dbname, ColumnFamilyData* cfd,
      versions_(versions),
      db_mutex_(db_mutex),
      shutting_down_(shutting_down),
+      pending_outputs_(pending_outputs),
      newest_snapshot_(newest_snapshot),
      job_context_(job_context),
      log_buffer_(log_buffer),
      db_directory_(db_directory),
-      output_file_directory_(output_file_directory),
      output_compression_(output_compression),
-      stats_(stats),
-      event_logger_(event_logger) {
-  // Update the thread status to indicate flush.
-  ReportStartedFlush();
-  TEST_SYNC_POINT("FlushJob::FlushJob()");
-}
+      stats_(stats) {}

-FlushJob::~FlushJob() {
-  TEST_SYNC_POINT("FlushJob::~FlushJob()");
-  ThreadStatusUtil::ResetThreadStatus();
-}
-
-void FlushJob::ReportStartedFlush() {
-  ThreadStatusUtil::SetColumnFamily(cfd_);
-  ThreadStatusUtil::SetThreadOperation(ThreadStatus::OP_FLUSH);
-  ThreadStatusUtil::SetThreadOperationProperty(
-      ThreadStatus::COMPACTION_JOB_ID,
-      job_context_->job_id);
-  IOSTATS_RESET(bytes_written);
-}
-
-void FlushJob::ReportFlushInputSize(const autovector<MemTable*>& mems) {
-  uint64_t input_size = 0;
-  for (auto* mem : mems) {
-    input_size += mem->ApproximateMemoryUsage();
-  }
-  ThreadStatusUtil::IncreaseThreadOperationProperty(
-      ThreadStatus::FLUSH_BYTES_MEMTABLES,
-      input_size);
-}
-
-void FlushJob::RecordFlushIOStats() {
-  ThreadStatusUtil::IncreaseThreadOperationProperty(
-      ThreadStatus::FLUSH_BYTES_WRITTEN, IOSTATS(bytes_written));
-  IOSTATS_RESET(bytes_written);
-}
-
-Status FlushJob::Run(FileMetaData* file_meta) {
-  AutoThreadOperationStageUpdater stage_run(
-      ThreadStatus::STAGE_FLUSH_RUN);
+Status FlushJob::Run() {
  // Save the contents of the earliest memtable as a new Table
-  FileMetaData meta;
+  uint64_t file_number;
  autovector<MemTable*> mems;
  cfd_->imm()->PickMemtablesToFlush(&mems);
  if (mems.empty()) {
@@ -129,8 +86,6 @@ Status FlushJob::Run(FileMetaData* file_meta) {
    return Status::OK();
  }

-  ReportFlushInputSize(mems);
-
  // entries mems are (implicitly) sorted in ascending order by their created
  // time. We will use the first memtable's `edit` to keep the meta info for
  // this flush.
@@ -143,7 +98,7 @@ Status FlushJob::Run(FileMetaData* file_meta) {
  edit->SetColumnFamily(cfd_->GetID());

  // This will release and re-acquire the mutex.
-  Status s = WriteLevel0Table(mems, edit, &meta);
+  Status s = WriteLevel0Table(mems, edit, &file_number);

  if (s.ok() &&
      (shutting_down_->load(std::memory_order_acquire) || cfd_->IsDropped())) {
@@ -152,42 +107,28 @@ Status FlushJob::Run(FileMetaData* file_meta) {
  }

  if (!s.ok()) {
-    cfd_->imm()->RollbackMemtableFlush(mems, meta.fd.GetNumber());
+    cfd_->imm()->RollbackMemtableFlush(mems, file_number, pending_outputs_);
  } else {
    // Replace immutable memtable with the generated Table
    s = cfd_->imm()->InstallMemtableFlushResults(
-        cfd_, mutable_cf_options_, mems, versions_, db_mutex_,
-        meta.fd.GetNumber(), &job_context_->memtables_to_free, db_directory_,
+        cfd_, mutable_cf_options_, mems, versions_, db_mutex_, file_number,
+        pending_outputs_, &job_context_->memtables_to_free, db_directory_,
        log_buffer_);
  }

-  if (s.ok() && file_meta != nullptr) {
-    *file_meta = meta;
-  }
-  RecordFlushIOStats();
-
-  auto stream = event_logger_->LogToBuffer(log_buffer_);
-  stream << "job" << job_context_->job_id << "event"
-         << "flush_finished";
-  stream << "lsm_state";
-  stream.StartArray();
-  auto vstorage = cfd_->current()->storage_info();
-  for (int level = 0; level < vstorage->num_levels(); ++level) {
-    stream << vstorage->NumLevelFiles(level);
-  }
-  stream.EndArray();
-
  return s;
 }

 Status FlushJob::WriteLevel0Table(const autovector<MemTable*>& mems,
-                                  VersionEdit* edit, FileMetaData* meta) {
-  AutoThreadOperationStageUpdater stage_updater(
-      ThreadStatus::STAGE_FLUSH_WRITE_L0);
+                                  VersionEdit* edit, uint64_t* filenumber) {
  db_mutex_->AssertHeld();
  const uint64_t start_micros = db_options_.env->NowMicros();
+  FileMetaData meta;
+
+  meta.fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
+  *filenumber = meta.fd.GetNumber();
  // path 0 for level 0 file.
-  meta->fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
+  pending_outputs_->insert({meta.fd.GetNumber(), 0});

  const SequenceNumber earliest_seqno_in_memtable =
      mems[0]->GetFirstSequenceNumber();
@@ -203,69 +144,34 @@ Status FlushJob::WriteLevel0Table(const autovector<MemTable*>& mems,
    ReadOptions ro;
    ro.total_order_seek = true;
    Arena arena;
-    uint64_t total_num_entries = 0, total_num_deletes = 0;
-    size_t total_memory_usage = 0;
    for (MemTable* m : mems) {
      Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-          "[%s] [JOB %d] Flushing memtable with next log file: %" PRIu64 "\n",
-          cfd_->GetName().c_str(), job_context_->job_id, m->GetNextLogNumber());
+          "[%s] Flushing memtable with next log file: %" PRIu64 "\n",
+          cfd_->GetName().c_str(), m->GetNextLogNumber());
      memtables.push_back(m->NewIterator(ro, &arena));
-      total_num_entries += m->num_entries();
-      total_num_deletes += m->num_deletes();
-      total_memory_usage += m->ApproximateMemoryUsage();
    }
-
-    event_logger_->Log() << "job" << job_context_->job_id << "event"
-                         << "flush_started"
-                         << "num_memtables" << mems.size() << "num_entries"
-                         << total_num_entries << "num_deletes"
-                         << total_num_deletes << "memory_usage"
-                         << total_memory_usage;
-    TableFileCreationInfo info;
    {
-      ScopedArenaIterator iter(
-          NewMergingIterator(&cfd_->internal_comparator(), &memtables[0],
-                             static_cast<int>(memtables.size()), &arena));
+      ScopedArenaIterator iter(NewMergingIterator(&cfd_->internal_comparator(),
+                                                  &memtables[0],
+                                                  memtables.size(), &arena));
      Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-          "[%s] [JOB %d] Level-0 flush table #%" PRIu64 ": started",
-          cfd_->GetName().c_str(), job_context_->job_id, meta->fd.GetNumber());
+          "[%s] Level-0 flush table #%" PRIu64 ": started",
+          cfd_->GetName().c_str(), meta.fd.GetNumber());

-      TEST_SYNC_POINT_CALLBACK("FlushJob::WriteLevel0Table:output_compression",
-                               &output_compression_);
      s = BuildTable(dbname_, db_options_.env, *cfd_->ioptions(), env_options_,
-                     cfd_->table_cache(), iter.get(), meta,
-                     cfd_->internal_comparator(),
-                     cfd_->int_tbl_prop_collector_factories(), newest_snapshot_,
+                     cfd_->table_cache(), iter.get(), &meta,
+                     cfd_->internal_comparator(), newest_snapshot_,
                     earliest_seqno_in_memtable, output_compression_,
-                     cfd_->ioptions()->compression_opts,
-                     mutable_cf_options_.paranoid_file_checks, Env::IO_HIGH,
-                     &info.table_properties);
+                     cfd_->ioptions()->compression_opts, Env::IO_HIGH);
      LogFlush(db_options_.info_log);
    }
    Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
-        "[%s] [JOB %d] Level-0 flush table #%" PRIu64 ": %" PRIu64
-        " bytes %s"
-        "%s",
-        cfd_->GetName().c_str(), job_context_->job_id, meta->fd.GetNumber(),
-        meta->fd.GetFileSize(), s.ToString().c_str(),
-        meta->marked_for_compaction ? " (needs compaction)" : "");
+        "[%s] Level-0 flush table #%" PRIu64 ": %" PRIu64 " bytes %s",
+        cfd_->GetName().c_str(), meta.fd.GetNumber(), meta.fd.GetFileSize(),
+        s.ToString().c_str());

-    // output to event logger
-    if (s.ok()) {
-      info.db_name = dbname_;
-      info.cf_name = cfd_->GetName();
-      info.file_path = TableFileName(db_options_.db_paths,
-                                     meta->fd.GetNumber(),
-                                     meta->fd.GetPathId());
-      info.file_size = meta->fd.GetFileSize();
-      info.job_id = job_context_->job_id;
-      EventHelpers::LogAndNotifyTableFileCreation(
-          event_logger_, db_options_.listeners,
-          meta->fd, info);
-    }
-
-    if (!db_options_.disableDataSync && output_file_directory_ != nullptr) {
-      output_file_directory_->Fsync();
+    if (!db_options_.disableDataSync && db_directory_ != nullptr) {
+      db_directory_->Fsync();
    }
    db_mutex_->Lock();
  }
@@ -274,27 +180,43 @@ Status FlushJob::WriteLevel0Table(const autovector<MemTable*>& mems,
  // re-acquire the most current version
  base = cfd_->current();

+  // There could be multiple threads writing to its own level-0 file.
+  // The pending_outputs cannot be cleared here, otherwise this newly
+  // created file might not be considered as a live-file by another
+  // compaction thread that is concurrently deleting obselete files.
+  // The pending_outputs can be cleared only after the new version is
+  // committed so that other threads can recognize this file as a
+  // valid one.
+  // pending_outputs_.erase(meta.number);
+
  // Note that if file_size is zero, the file has been deleted and
  // should not be added to the manifest.
-  if (s.ok() && meta->fd.GetFileSize() > 0) {
+  int level = 0;
+  if (s.ok() && meta.fd.GetFileSize() > 0) {
+    const Slice min_user_key = meta.smallest.user_key();
+    const Slice max_user_key = meta.largest.user_key();
    // if we have more than 1 background thread, then we cannot
    // insert files directly into higher levels because some other
    // threads could be concurrently producing compacted files for
    // that key range.
-    // Add file to L0
-    edit->AddFile(0 /* level */, meta->fd.GetNumber(), meta->fd.GetPathId(),
-                  meta->fd.GetFileSize(), meta->smallest, meta->largest,
-                  meta->smallest_seqno, meta->largest_seqno,
-                  meta->marked_for_compaction);
+    if (base != nullptr && db_options_.max_background_compactions <= 1 &&
+        db_options_.max_background_flushes == 0 &&
+        cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
+      level = base->storage_info()->PickLevelForMemTableOutput(
+          mutable_cf_options_, min_user_key, max_user_key);
+    }
+    edit->AddFile(level, meta.fd.GetNumber(), meta.fd.GetPathId(),
+                  meta.fd.GetFileSize(), meta.smallest, meta.largest,
+                  meta.smallest_seqno, meta.largest_seqno);
  }

  InternalStats::CompactionStats stats(1);
  stats.micros = db_options_.env->NowMicros() - start_micros;
-  stats.bytes_written = meta->fd.GetFileSize();
-  cfd_->internal_stats()->AddCompactionStats(0 /* level */, stats);
+  stats.bytes_written = meta.fd.GetFileSize();
+  cfd_->internal_stats()->AddCompactionStats(level, stats);
  cfd_->internal_stats()->AddCFStats(InternalStats::BYTES_FLUSHED,
-                                     meta->fd.GetFileSize());
-  RecordTick(stats_, COMPACT_WRITE_BYTES, meta->fd.GetFileSize());
+                                     meta.fd.GetFileSize());
+  RecordTick(stats_, COMPACT_WRITE_BYTES, meta.fd.GetFileSize());
  return s;
 }

@@ -28,8 +28,6 @@
 #include "rocksdb/memtablerep.h"
 #include "rocksdb/transaction_log.h"
 #include "util/autovector.h"
-#include "util/event_logger.h"
-#include "util/instrumented_mutex.h"
 #include "util/stop_watch.h"
 #include "util/thread_local.h"
 #include "util/scoped_arena_iterator.h"
@@ -56,38 +54,33 @@ class FlushJob {
           const DBOptions& db_options,
           const MutableCFOptions& mutable_cf_options,
           const EnvOptions& env_options, VersionSet* versions,
-           InstrumentedMutex* db_mutex, std::atomic<bool>* shutting_down,
-           SequenceNumber newest_snapshot, JobContext* job_context,
-           LogBuffer* log_buffer, Directory* db_directory,
-           Directory* output_file_directory, CompressionType output_compression,
-           Statistics* stats, EventLogger* event_logger);
+           port::Mutex* db_mutex, std::atomic<bool>* shutting_down,
+           FileNumToPathIdMap* pending_outputs, SequenceNumber newest_snapshot,
+           JobContext* job_context, LogBuffer* log_buffer,
+           Directory* db_directory, CompressionType output_compression,
+           Statistics* stats);
+  ~FlushJob() {}

-  ~FlushJob();
-
-  Status Run(FileMetaData* file_meta = nullptr);
+  Status Run();

 private:
-  void ReportStartedFlush();
-  void ReportFlushInputSize(const autovector<MemTable*>& mems);
-  void RecordFlushIOStats();
  Status WriteLevel0Table(const autovector<MemTable*>& mems, VersionEdit* edit,
-                          FileMetaData* meta);
+                          uint64_t* filenumber);
  const std::string& dbname_;
  ColumnFamilyData* cfd_;
  const DBOptions& db_options_;
  const MutableCFOptions& mutable_cf_options_;
  const EnvOptions& env_options_;
  VersionSet* versions_;
-  InstrumentedMutex* db_mutex_;
+  port::Mutex* db_mutex_;
  std::atomic<bool>* shutting_down_;
+  FileNumToPathIdMap* pending_outputs_;
  SequenceNumber newest_snapshot_;
  JobContext* job_context_;
  LogBuffer* log_buffer_;
  Directory* db_directory_;
-  Directory* output_file_directory_;
  CompressionType output_compression_;
  Statistics* stats_;
-  EventLogger* event_logger_;
 };

 }  // namespace rocksdb
@@ -9,10 +9,7 @@
 #include "db/flush_job.h"
 #include "db/column_family.h"
 #include "db/version_set.h"
-#include "db/writebuffer.h"
 #include "rocksdb/cache.h"
-#include "util/file_reader_writer.h"
-#include "util/string_util.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
 #include "table/mock_table.h"
@@ -22,19 +19,17 @@ namespace rocksdb {
 // TODO(icanadi) Mock out everything else:
 // 1. VersionSet
 // 2. Memtable
-class FlushJobTest : public testing::Test {
+class FlushJobTest {
 public:
  FlushJobTest()
      : env_(Env::Default()),
        dbname_(test::TmpDir() + "/flush_job_test"),
-        table_cache_(NewLRUCache(50000, 16)),
-        write_buffer_(db_options_.db_write_buffer_size),
+        table_cache_(NewLRUCache(50000, 16, 8)),
        versions_(new VersionSet(dbname_, &db_options_, env_options_,
-                                 table_cache_.get(), &write_buffer_,
-                                 &write_controller_)),
+                                 table_cache_.get(), &write_controller_)),
        shutting_down_(false),
-        mock_table_factory_(new mock::MockTableFactory()) {
-    EXPECT_OK(env_->CreateDirIfMissing(dbname_));
+        mock_table_factory_(new MockTableFactory()) {
+    ASSERT_OK(env_->CreateDirIfMissing(dbname_));
    db_options_.db_paths.emplace_back(dbname_,
                                      std::numeric_limits<uint64_t>::max());
    // TODO(icanadi) Remove this once we mock out VersionSet
@@ -43,7 +38,7 @@ class FlushJobTest : public testing::Test {
    cf_options_.table_factory = mock_table_factory_;
    column_families.emplace_back(kDefaultColumnFamilyName, cf_options_);

-    EXPECT_OK(versions_->Recover(column_families, false));
+    ASSERT_OK(versions_->Recover(column_families, false));
  }

  void NewDB() {
@@ -57,10 +52,8 @@ class FlushJobTest : public testing::Test {
    Status s = env_->NewWritableFile(
        manifest, &file, env_->OptimizeForManifestWrite(env_options_));
    ASSERT_OK(s);
-    unique_ptr<WritableFileWriter> file_writer(
-        new WritableFileWriter(std::move(file), EnvOptions()));
    {
-      log::Writer log(std::move(file_writer));
+      log::Writer log(std::move(file));
      std::string record;
      new_db.EncodeTo(&record);
      s = log.AddRecord(record);
@@ -76,64 +69,53 @@ class FlushJobTest : public testing::Test {
  std::shared_ptr<Cache> table_cache_;
  WriteController write_controller_;
  DBOptions db_options_;
-  WriteBuffer write_buffer_;
  ColumnFamilyOptions cf_options_;
  std::unique_ptr<VersionSet> versions_;
-  InstrumentedMutex mutex_;
+  port::Mutex mutex_;
  std::atomic<bool> shutting_down_;
-  std::shared_ptr<mock::MockTableFactory> mock_table_factory_;
+  FileNumToPathIdMap pending_outputs_;
+  std::shared_ptr<MockTableFactory> mock_table_factory_;
 };

-TEST_F(FlushJobTest, Empty) {
-  JobContext job_context(0);
+TEST(FlushJobTest, Empty) {
+  JobContext job_context;
  auto cfd = versions_->GetColumnFamilySet()->GetDefault();
-  EventLogger event_logger(db_options_.info_log.get());
  FlushJob flush_job(dbname_, versions_->GetColumnFamilySet()->GetDefault(),
                     db_options_, *cfd->GetLatestMutableCFOptions(),
                     env_options_, versions_.get(), &mutex_, &shutting_down_,
-                     SequenceNumber(), &job_context, nullptr, nullptr, nullptr,
-                     kNoCompression, nullptr, &event_logger);
+                     &pending_outputs_, SequenceNumber(), &job_context, nullptr,
+                     nullptr, kNoCompression, nullptr);
  ASSERT_OK(flush_job.Run());
-  job_context.Clean();
 }

-TEST_F(FlushJobTest, NonEmpty) {
-  JobContext job_context(0);
+TEST(FlushJobTest, NonEmpty) {
+  JobContext job_context;
  auto cfd = versions_->GetColumnFamilySet()->GetDefault();
-  auto new_mem = cfd->ConstructNewMemtable(*cfd->GetLatestMutableCFOptions(),
-                                           kMaxSequenceNumber);
+
+  auto new_mem = new MemTable(cfd->internal_comparator(), *cfd->ioptions(),
+                              *cfd->GetLatestMutableCFOptions());
  new_mem->Ref();
  std::map<std::string, std::string> inserted_keys;
  for (int i = 1; i < 10000; ++i) {
-    std::string key(ToString(i));
-    std::string value("value" + ToString(i));
+    std::string key(std::to_string(i));
+    std::string value("value" + std::to_string(i));
    new_mem->Add(SequenceNumber(i), kTypeValue, key, value);
    InternalKey internal_key(key, SequenceNumber(i), kTypeValue);
    inserted_keys.insert({internal_key.Encode().ToString(), value});
  }
+  cfd->imm()->Add(new_mem);

-  autovector<MemTable*> to_delete;
-  cfd->imm()->Add(new_mem, &to_delete);
-  for (auto& m : to_delete) {
-    delete m;
-  }
-
-  EventLogger event_logger(db_options_.info_log.get());
  FlushJob flush_job(dbname_, versions_->GetColumnFamilySet()->GetDefault(),
                     db_options_, *cfd->GetLatestMutableCFOptions(),
                     env_options_, versions_.get(), &mutex_, &shutting_down_,
-                     SequenceNumber(), &job_context, nullptr, nullptr, nullptr,
-                     kNoCompression, nullptr, &event_logger);
+                     &pending_outputs_, SequenceNumber(), &job_context, nullptr,
+                     nullptr, kNoCompression, nullptr);
  mutex_.Lock();
  ASSERT_OK(flush_job.Run());
  mutex_.Unlock();
  mock_table_factory_->AssertSingleFile(inserted_keys);
-  job_context.Clean();
 }

 }  // namespace rocksdb

-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
+int main(int argc, char** argv) { return rocksdb::test::RunAllTests(); }
@@ -23,7 +23,6 @@ class FlushScheduler {

  void ScheduleFlush(ColumnFamilyData* cfd);
  // Returns Ref()-ed column family. Client needs to Unref()
-  // REQUIRES: db mutex is held (exception is single-threaded recovery)
  ColumnFamilyData* GetNextColumnFamily();

  bool Empty();
@@ -53,7 +53,7 @@ class LevelIterator : public Iterator {
    status_ = Status::NotSupported("LevelIterator::SeekToLast()");
    valid_ = false;
  }
-  void Prev() override {
+  void Prev() {
    status_ = Status::NotSupported("LevelIterator::Prev()");
    valid_ = false;
  }
@@ -119,14 +119,12 @@ ForwardIterator::ForwardIterator(DBImpl* db, const ReadOptions& read_options,
    : db_(db),
      read_options_(read_options),
      cfd_(cfd),
-      prefix_extractor_(cfd->ioptions()->prefix_extractor),
+      prefix_extractor_(cfd->options()->prefix_extractor.get()),
      user_comparator_(cfd->user_comparator()),
      immutable_min_heap_(MinIterComparator(&cfd_->internal_comparator())),
      sv_(current_sv),
      mutable_iter_(nullptr),
      current_(nullptr),
-      status_(Status::OK()),
-      immutable_status_(Status::OK()),
      valid_(false),
      is_prev_set_(false),
      is_prev_inclusive_(false) {
@@ -158,9 +156,7 @@ void ForwardIterator::Cleanup(bool release_sv) {

  if (release_sv) {
    if (sv_ != nullptr && sv_->Unref()) {
-      // Job id == 0 means that this is not our background process, but rather
-      // user thread
-      JobContext job_context(0);
+      JobContext job_context;
      db_->mutex_.Lock();
      sv_->Cleanup();
      db_->FindObsoleteFiles(&job_context, false, true);
@@ -169,7 +165,6 @@ void ForwardIterator::Cleanup(bool release_sv) {
      if (job_context.HaveSomethingToDelete()) {
        db_->PurgeObsoleteFiles(job_context);
      }
-      job_context.Clean();
    }
  }
 }
@@ -182,7 +177,7 @@ void ForwardIterator::SeekToFirst() {
  if (sv_ == nullptr ||
      sv_ ->version_number != cfd_->GetSuperVersionNumber()) {
    RebuildIterators(true);
-  } else if (immutable_status_.IsIncomplete()) {
+  } else if (status_.IsIncomplete()) {
    ResetIncompleteIterators();
  }
  SeekInternal(Slice(), true);
@@ -192,7 +187,7 @@ void ForwardIterator::Seek(const Slice& internal_key) {
  if (sv_ == nullptr ||
      sv_ ->version_number != cfd_->GetSuperVersionNumber()) {
    RebuildIterators(true);
-  } else if (immutable_status_.IsIncomplete()) {
+  } else if (status_.IsIncomplete()) {
    ResetIncompleteIterators();
  }
  SeekInternal(internal_key, false);
@@ -210,16 +205,13 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
  // if it turns to need to seek immutable often. We probably want to have
  // an option to turn it off.
  if (seek_to_first || NeedToSeekImmutable(internal_key)) {
-    immutable_status_ = Status::OK();
    {
      auto tmp = MinIterHeap(MinIterComparator(&cfd_->internal_comparator()));
      immutable_min_heap_.swap(tmp);
    }
    for (auto* m : imm_iters_) {
      seek_to_first ? m->SeekToFirst() : m->Seek(internal_key);
-      if (!m->status().ok()) {
-        immutable_status_ = m->status();
-      } else if (m->Valid()) {
+      if (m->Valid()) {
        immutable_min_heap_.push(m);
      }
    }
@@ -243,8 +235,13 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
        l0_iters_[i]->Seek(internal_key);
      }

-      if (!l0_iters_[i]->status().ok()) {
-        immutable_status_ = l0_iters_[i]->status();
+      if (l0_iters_[i]->status().IsIncomplete()) {
+        // if any of the immutable iterators is incomplete (no-io option was
+        // used), we are unable to reliably find the smallest key
+        assert(read_options_.read_tier == kBlockCacheTier);
+        status_ = l0_iters_[i]->status();
+        valid_ = false;
+        return;
      } else if (l0_iters_[i]->Valid()) {
        immutable_min_heap_.push(l0_iters_[i]);
      }
@@ -267,11 +264,10 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
        if (search_left_bound == search_right_bound) {
          f_idx = search_left_bound;
        } else if (search_left_bound < search_right_bound) {
-          f_idx =
-              FindFileInRange(level_files, internal_key, search_left_bound,
-                              search_right_bound == FileIndexer::kLevelMaxIndex
-                                  ? static_cast<uint32_t>(level_files.size())
-                                  : search_right_bound);
+          f_idx = FindFileInRange(
+              level_files, internal_key, search_left_bound,
+              search_right_bound == FileIndexer::kLevelMaxIndex ?
+                level_files.size() : search_right_bound);
        } else {
          // search_left_bound > search_right_bound
          // There are only 2 cases this can happen:
@@ -315,8 +311,12 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
        seek_to_first ? level_iters_[level - 1]->SeekToFirst() :
                        level_iters_[level - 1]->Seek(internal_key);

-        if (!level_iters_[level - 1]->status().ok()) {
-          immutable_status_ = level_iters_[level - 1]->status();
+        if (level_iters_[level - 1]->status().IsIncomplete()) {
+          // see above
+          assert(read_options_.read_tier == kBlockCacheTier);
+          status_ = level_iters_[level - 1]->status();
+          valid_ = false;
+          return;
        } else if (level_iters_[level - 1]->Valid()) {
          immutable_min_heap_.push(level_iters_[level - 1]);
        }
@@ -371,8 +371,11 @@ void ForwardIterator::Next() {

  current_->Next();
  if (current_ != mutable_iter_) {
-    if (!current_->status().ok()) {
-      immutable_status_ = current_->status();
+    if (current_->status().IsIncomplete()) {
+      assert(read_options_.read_tier == kBlockCacheTier);
+      status_ = current_->status();
+      valid_ = false;
+      return;
    } else if (current_->Valid()) {
      immutable_min_heap_.push(current_);
    }
@@ -398,7 +401,23 @@ Status ForwardIterator::status() const {
    return mutable_iter_->status();
  }

-  return immutable_status_;
+  for (auto *it : imm_iters_) {
+    if (it && !it->status().ok()) {
+      return it->status();
+    }
+  }
+  for (auto *it : l0_iters_) {
+    if (it && !it->status().ok()) {
+      return it->status();
+    }
+  }
+  for (auto *it : level_iters_) {
+    if (it && !it->status().ok()) {
+      return it->status();
+    }
+  }
+
+  return Status::OK();
 }

 void ForwardIterator::RebuildIterators(bool refresh_sv) {
@@ -492,7 +511,7 @@ bool ForwardIterator::NeedToSeekImmutable(const Slice& target) {
  // 'target' belongs to that interval (immutable_min_heap_.top() is already
  // at the correct position).

-  if (!valid_ || !current_ || !is_prev_set_ || !immutable_status_.ok()) {
+  if (!valid_ || !current_ || !is_prev_set_) {
    return true;
  }
  Slice prev_key = prev_key_.GetKey();
@@ -58,7 +58,7 @@ class ForwardIterator : public Iterator {
    status_ = Status::NotSupported("ForwardIterator::SeekToLast()");
    valid_ = false;
  }
-  void Prev() override {
+  void Prev() {
    status_ = Status::NotSupported("ForwardIterator::Prev");
    valid_ = false;
  }
@@ -97,7 +97,6 @@ class ForwardIterator : public Iterator {
  Iterator* current_;
  // internal iterator status
  Status status_;
-  Status immutable_status_;
  bool valid_;

  IterKey prev_key_;
@@ -13,16 +13,12 @@
 #endif

 #include <inttypes.h>
-#include <algorithm>
 #include <vector>
 #include "db/column_family.h"
-
 #include "db/db_impl.h"
-#include "util/string_util.h"

 namespace rocksdb {

-#ifndef ROCKSDB_LITE
 namespace {
 const double kMB = 1048576.0;
 const double kGB = kMB * 1024;
@@ -31,143 +27,72 @@ void PrintLevelStatsHeader(char* buf, size_t len, const std::string& cf_name) {
  snprintf(
      buf, len,
      "\n** Compaction Stats [%s] **\n"
-      "Level    Files   Size(MB) Score Read(GB)  Rn(GB) Rnp1(GB) "
-      "Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) "
-      "Comp(sec) Comp(cnt) Avg(sec) "
-      "Stall(cnt)  KeyIn KeyDrop\n"
+      "Level   Files   Size(MB) Score Read(GB)  Rn(GB) Rnp1(GB) "
+      "Write(GB) Wnew(GB) RW-Amp W-Amp Rd(MB/s) Wr(MB/s)  Rn(cnt) "
+      "Rnp1(cnt) Wnp1(cnt) Wnew(cnt)  Comp(sec) Comp(cnt) Avg(sec) "
+      "Stall(sec) Stall(cnt) Avg(ms)     RecordIn   RecordDrop\n"
      "--------------------------------------------------------------------"
-      "-----------------------------------------------------------"
-      "--------------------------------------\n",
+      "--------------------------------------------------------------------"
+      "--------------------------------------------------------------------\n",
      cf_name.c_str());
 }

 void PrintLevelStats(char* buf, size_t len, const std::string& name,
    int num_files, int being_compacted, double total_file_size, double score,
-    double w_amp, uint64_t stalls,
+    double rw_amp, double w_amp, double stall_us, uint64_t stalls,
    const InternalStats::CompactionStats& stats) {
-  uint64_t bytes_read =
-      stats.bytes_read_non_output_levels + stats.bytes_read_output_level;
-  int64_t bytes_new =
-      stats.bytes_written - stats.bytes_read_output_level;
+  uint64_t bytes_read = stats.bytes_readn + stats.bytes_readnp1;
+  uint64_t bytes_new = stats.bytes_written - stats.bytes_readnp1;
  double elapsed = (stats.micros + 1) / 1000000.0;
-  std::string num_input_records = NumberToHumanString(stats.num_input_records);
-  std::string num_dropped_records =
-      NumberToHumanString(stats.num_dropped_records);

  snprintf(buf, len,
-           "%4s %6d/%-3d %8.0f %5.1f " /* Level, Files, Size(MB), Score */
+           "%4s %5d/%-3d %8.0f %5.1f " /* Level, Files, Size(MB), Score */
           "%8.1f "                    /* Read(GB) */
           "%7.1f "                    /* Rn(GB) */
           "%8.1f "                    /* Rnp1(GB) */
           "%9.1f "                    /* Write(GB) */
           "%8.1f "                    /* Wnew(GB) */
-           "%9.1f "                    /* Moved(GB) */
+           "%6.1f "                    /* RW-Amp */
           "%5.1f "                    /* W-Amp */
           "%8.1f "                    /* Rd(MB/s) */
           "%8.1f "                    /* Wr(MB/s) */
-           "%9.0f "                    /* Comp(sec) */
+           "%8d "                      /* Rn(cnt) */
+           "%9d "                      /* Rnp1(cnt) */
+           "%9d "                      /* Wnp1(cnt) */
+           "%9d "                      /* Wnew(cnt) */
+           "%10.0f "                   /* Comp(sec) */
           "%9d "                      /* Comp(cnt) */
           "%8.3f "                    /* Avg(sec) */
+           "%10.2f "                   /* Stall(sec) */
           "%10" PRIu64
           " "      /* Stall(cnt) */
-           "%7s "   /* KeyIn */
-           "%6s\n", /* KeyDrop */
+           "%7.2f " /* Avg(ms) */
+           "%12" PRIu64
+           " " /* input entries */
+           "%12" PRIu64 "\n" /* number of records reduced */,
           name.c_str(), num_files, being_compacted, total_file_size / kMB,
-           score, bytes_read / kGB, stats.bytes_read_non_output_levels / kGB,
-           stats.bytes_read_output_level / kGB, stats.bytes_written / kGB,
-           bytes_new / kGB, stats.bytes_moved / kGB,
-           w_amp, bytes_read / kMB / elapsed,
-           stats.bytes_written / kMB / elapsed, stats.micros / 1000000.0,
-           stats.count,
+           score, bytes_read / kGB, stats.bytes_readn / kGB,
+           stats.bytes_readnp1 / kGB, stats.bytes_written / kGB,
+           bytes_new / kGB, rw_amp, w_amp, bytes_read / kMB / elapsed,
+           stats.bytes_written / kMB / elapsed, stats.files_in_leveln,
+           stats.files_in_levelnp1, stats.files_out_levelnp1,
+           stats.files_out_levelnp1 - stats.files_in_levelnp1,
+           stats.micros / 1000000.0, stats.count,
           stats.count == 0 ? 0 : stats.micros / 1000000.0 / stats.count,
-           stalls,
-           num_input_records.c_str(), num_dropped_records.c_str());
-}
+           stall_us / 1000000.0, stalls,
+           stalls == 0 ? 0 : stall_us / 1000.0 / stalls,
+           stats.num_input_records, stats.num_dropped_records);
 }

-static const std::string rocksdb_prefix = "rocksdb.";

-static const std::string num_files_at_level_prefix = "num-files-at-level";
-static const std::string allstats = "stats";
-static const std::string sstables = "sstables";
-static const std::string cfstats = "cfstats";
-static const std::string dbstats = "dbstats";
-static const std::string levelstats = "levelstats";
-static const std::string num_immutable_mem_table = "num-immutable-mem-table";
-static const std::string num_immutable_mem_table_flushed =
-    "num-immutable-mem-table-flushed";
-static const std::string mem_table_flush_pending = "mem-table-flush-pending";
-static const std::string compaction_pending = "compaction-pending";
-static const std::string background_errors = "background-errors";
-static const std::string cur_size_active_mem_table =
-                          "cur-size-active-mem-table";
-static const std::string cur_size_all_mem_tables = "cur-size-all-mem-tables";
-static const std::string num_entries_active_mem_table =
-                          "num-entries-active-mem-table";
-static const std::string num_entries_imm_mem_tables =
-                          "num-entries-imm-mem-tables";
-static const std::string num_deletes_active_mem_table =
-                          "num-deletes-active-mem-table";
-static const std::string num_deletes_imm_mem_tables =
-                          "num-deletes-imm-mem-tables";
-static const std::string estimate_num_keys = "estimate-num-keys";
-static const std::string estimate_table_readers_mem =
-                          "estimate-table-readers-mem";
-static const std::string is_file_deletions_enabled =
-                          "is-file-deletions-enabled";
-static const std::string num_snapshots = "num-snapshots";
-static const std::string oldest_snapshot_time = "oldest-snapshot-time";
-static const std::string num_live_versions = "num-live-versions";
-static const std::string estimate_live_data_size = "estimate-live-data-size";
-static const std::string base_level = "base-level";
-
-const std::string DB::Properties::kNumFilesAtLevelPrefix =
-                      rocksdb_prefix + num_files_at_level_prefix;
-const std::string DB::Properties::kStats = rocksdb_prefix + allstats;
-const std::string DB::Properties::kSSTables = rocksdb_prefix + sstables;
-const std::string DB::Properties::kCFStats = rocksdb_prefix + cfstats;
-const std::string DB::Properties::kDBStats = rocksdb_prefix + dbstats;
-const std::string DB::Properties::kNumImmutableMemTable =
-                      rocksdb_prefix + num_immutable_mem_table;
-const std::string DB::Properties::kMemTableFlushPending =
-                      rocksdb_prefix + mem_table_flush_pending;
-const std::string DB::Properties::kCompactionPending =
-                      rocksdb_prefix + compaction_pending;
-const std::string DB::Properties::kBackgroundErrors =
-                      rocksdb_prefix + background_errors;
-const std::string DB::Properties::kCurSizeActiveMemTable =
-                      rocksdb_prefix + cur_size_active_mem_table;
-const std::string DB::Properties::kCurSizeAllMemTables =
-                      rocksdb_prefix + cur_size_all_mem_tables;
-const std::string DB::Properties::kNumEntriesActiveMemTable =
-                      rocksdb_prefix + num_entries_active_mem_table;
-const std::string DB::Properties::kNumEntriesImmMemTables =
-                      rocksdb_prefix + num_entries_imm_mem_tables;
-const std::string DB::Properties::kNumDeletesActiveMemTable =
-                      rocksdb_prefix + num_deletes_active_mem_table;
-const std::string DB::Properties::kNumDeletesImmMemTables =
-                      rocksdb_prefix + num_deletes_imm_mem_tables;
-const std::string DB::Properties::kEstimateNumKeys =
-                      rocksdb_prefix + estimate_num_keys;
-const std::string DB::Properties::kEstimateTableReadersMem =
-                      rocksdb_prefix + estimate_table_readers_mem;
-const std::string DB::Properties::kIsFileDeletionsEnabled =
-                      rocksdb_prefix + is_file_deletions_enabled;
-const std::string DB::Properties::kNumSnapshots =
-                      rocksdb_prefix + num_snapshots;
-const std::string DB::Properties::kOldestSnapshotTime =
-                      rocksdb_prefix + oldest_snapshot_time;
-const std::string DB::Properties::kNumLiveVersions =
-                      rocksdb_prefix + num_live_versions;
-const std::string DB::Properties::kEstimateLiveDataSize =
-                      rocksdb_prefix + estimate_live_data_size;
+}

 DBPropertyType GetPropertyType(const Slice& property, bool* is_int_property,
                               bool* need_out_of_mutex) {
  assert(is_int_property != nullptr);
  assert(need_out_of_mutex != nullptr);
  Slice in = property;
-  Slice prefix(rocksdb_prefix);
+  Slice prefix("rocksdb.");
  *need_out_of_mutex = false;
  *is_int_property = false;
  if (!in.starts_with(prefix)) {
@@ -175,61 +100,44 @@ DBPropertyType GetPropertyType(const Slice& property, bool* is_int_property,
  }
  in.remove_prefix(prefix.size());

-  if (in.starts_with(num_files_at_level_prefix)) {
+  if (in.starts_with("num-files-at-level")) {
    return kNumFilesAtLevel;
-  } else if (in == levelstats) {
+  } else if (in == "levelstats") {
    return kLevelStats;
-  } else if (in == allstats) {
+  } else if (in == "stats") {
    return kStats;
-  } else if (in == cfstats) {
+  } else if (in == "cfstats") {
    return kCFStats;
-  } else if (in == dbstats) {
+  } else if (in == "dbstats") {
    return kDBStats;
-  } else if (in == sstables) {
+  } else if (in == "sstables") {
    return kSsTables;
  }

  *is_int_property = true;
-  if (in == num_immutable_mem_table) {
+  if (in == "num-immutable-mem-table") {
    return kNumImmutableMemTable;
-  } else if (in == num_immutable_mem_table_flushed) {
-    return kNumImmutableMemTableFlushed;
-  } else if (in == mem_table_flush_pending) {
+  } else if (in == "mem-table-flush-pending") {
    return kMemtableFlushPending;
-  } else if (in == compaction_pending) {
+  } else if (in == "compaction-pending") {
    return kCompactionPending;
-  } else if (in == background_errors) {
+  } else if (in == "background-errors") {
    return kBackgroundErrors;
-  } else if (in == cur_size_active_mem_table) {
+  } else if (in == "cur-size-active-mem-table") {
    return kCurSizeActiveMemTable;
-  } else if (in == cur_size_all_mem_tables) {
+  } else if (in == "cur-size-all-mem-tables") {
    return kCurSizeAllMemTables;
-  } else if (in == num_entries_active_mem_table) {
+  } else if (in == "num-entries-active-mem-table") {
    return kNumEntriesInMutableMemtable;
-  } else if (in == num_entries_imm_mem_tables) {
+  } else if (in == "num-entries-imm-mem-tables") {
    return kNumEntriesInImmutableMemtable;
-  } else if (in == num_deletes_active_mem_table) {
-    return kNumDeletesInMutableMemtable;
-  } else if (in == num_deletes_imm_mem_tables) {
-    return kNumDeletesInImmutableMemtable;
-  } else if (in == estimate_num_keys) {
+  } else if (in == "estimate-num-keys") {
    return kEstimatedNumKeys;
-  } else if (in == estimate_table_readers_mem) {
+  } else if (in == "estimate-table-readers-mem") {
    *need_out_of_mutex = true;
    return kEstimatedUsageByTableReaders;
-  } else if (in == is_file_deletions_enabled) {
+  } else if (in == "is-file-deletions-enabled") {
    return kIsFileDeletionEnabled;
-  } else if (in == num_snapshots) {
-    return kNumSnapshots;
-  } else if (in == oldest_snapshot_time) {
-    return kOldestSnapshotTime;
-  } else if (in == num_live_versions) {
-    return kNumLiveVersions;
-  } else if (in == estimate_live_data_size) {
-    *need_out_of_mutex = true;
-    return kEstimateLiveDataSize;
-  } else if (in == base_level) {
-    return kBaseLevel;
  }
  return kUnknown;
 }
@@ -238,19 +146,15 @@ bool InternalStats::GetIntPropertyOutOfMutex(DBPropertyType property_type,
                                             Version* version,
                                             uint64_t* value) const {
  assert(value != nullptr);
-  const auto* vstorage = cfd_->current()->storage_info();
-
-  switch (property_type) {
-    case kEstimatedUsageByTableReaders:
-      *value = (version == nullptr) ?
-        0 : version->GetMemoryUsageByTableReaders();
-      return true;
-    case kEstimateLiveDataSize:
-      *value = vstorage->EstimateLiveDataSize();
-      return true;
-    default:
-      return false;
+  if (property_type != kEstimatedUsageByTableReaders) {
+    return false;
  }
+  if (version == nullptr) {
+    *value = 0;
+  } else {
+    *value = version->GetMemoryUsageByTableReaders();
+  }
+  return true;
 }

 bool InternalStats::GetStringProperty(DBPropertyType property_type,
@@ -292,10 +196,10 @@ bool InternalStats::GetStringProperty(DBPropertyType property_type,
      return true;
    }
    case kStats: {
-      if (!GetStringProperty(kCFStats, DB::Properties::kCFStats, value)) {
+      if (!GetStringProperty(kCFStats, "rocksdb.cfstats", value)) {
        return false;
      }
-      if (!GetStringProperty(kDBStats, DB::Properties::kDBStats, value)) {
+      if (!GetStringProperty(kDBStats, "rocksdb.dbstats", value)) {
        return false;
      }
      return true;
@@ -318,15 +222,11 @@ bool InternalStats::GetStringProperty(DBPropertyType property_type,

 bool InternalStats::GetIntProperty(DBPropertyType property_type,
                                   uint64_t* value, DBImpl* db) const {
-  db->mutex_.AssertHeld();
  const auto* vstorage = cfd_->current()->storage_info();

  switch (property_type) {
    case kNumImmutableMemTable:
-      *value = cfd_->imm()->NumNotFlushed();
-      return true;
-    case kNumImmutableMemTableFlushed:
-      *value = cfd_->imm()->NumFlushed();
+      *value = cfd_->imm()->size();
      return true;
    case kMemtableFlushPending:
      // Return number of mem tables that are ready to flush (made immutable)
@@ -335,7 +235,7 @@ bool InternalStats::GetIntProperty(DBPropertyType property_type,
    case kCompactionPending:
      // 1 if the system already determines at least one compacdtion is needed.
      // 0 otherwise,
-      *value = (cfd_->compaction_picker()->NeedsCompaction(vstorage) ? 1 : 0);
+      *value = (vstorage->NeedsCompaction() ? 1 : 0);
      return true;
    case kBackgroundErrors:
      // Accumulated number of  errors in background flushes or compactions.
@@ -352,47 +252,24 @@ bool InternalStats::GetIntProperty(DBPropertyType property_type,
      return true;
    case kNumEntriesInMutableMemtable:
      // Current number of entires in the active memtable
-      *value = cfd_->mem()->num_entries();
+      *value = cfd_->mem()->GetNumEntries();
      return true;
    case kNumEntriesInImmutableMemtable:
      // Current number of entries in the immutable memtables
      *value = cfd_->imm()->current()->GetTotalNumEntries();
      return true;
-    case kNumDeletesInMutableMemtable:
-      // Current number of entires in the active memtable
-      *value = cfd_->mem()->num_deletes();
-      return true;
-    case kNumDeletesInImmutableMemtable:
-      // Current number of entries in the immutable memtables
-      *value = cfd_->imm()->current()->GetTotalNumDeletes();
-      return true;
    case kEstimatedNumKeys:
      // Estimate number of entries in the column family:
      // Use estimated entries in tables + total entries in memtables.
-      *value = cfd_->mem()->num_entries() +
-               cfd_->imm()->current()->GetTotalNumEntries() -
-               (cfd_->mem()->num_deletes() +
-                cfd_->imm()->current()->GetTotalNumDeletes()) *
-                   2 +
+      *value = cfd_->mem()->GetNumEntries() +
+               cfd_->imm()->current()->GetTotalNumEntries() +
               vstorage->GetEstimatedActiveKeys();
      return true;
-    case kNumSnapshots:
-      *value = db->snapshots().count();
-      return true;
-    case kOldestSnapshotTime:
-      *value = static_cast<uint64_t>(db->snapshots().GetOldestSnapshotTime());
-      return true;
-    case kNumLiveVersions:
-      *value = cfd_->GetNumLiveVersions();
-      return true;
 #ifndef ROCKSDB_LITE
    case kIsFileDeletionEnabled:
      *value = db->IsFileDeletionsEnabled();
      return true;
 #endif
-    case kBaseLevel:
-      *value = vstorage->base_level();
-      return true;
    default:
      return false;
  }
@@ -415,14 +292,6 @@ void InternalStats::DumpDBStats(std::string* value) {
  uint64_t wal_bytes = db_stats_[InternalStats::WAL_FILE_BYTES];
  uint64_t wal_synced = db_stats_[InternalStats::WAL_FILE_SYNCED];
  uint64_t write_with_wal = db_stats_[InternalStats::WRITE_WITH_WAL];
-  uint64_t write_stall_micros = db_stats_[InternalStats::WRITE_STALL_MICROS];
-  uint64_t compact_bytes_read = 0;
-  uint64_t compact_bytes_write = 0;
-  uint64_t compact_micros = 0;
-
-  const int kHumanMicrosLen = 32;
-  char human_micros[kHumanMicrosLen];
-
  // Data
  // writes: total number of write requests.
  // keys: total number of key updates issued by all the write requests
@@ -433,46 +302,19 @@ void InternalStats::DumpDBStats(std::string* value) {
  //
  // The format is the same for interval stats.
  snprintf(buf, sizeof(buf),
-           "Cumulative writes: %s writes, %s keys, %s batches, "
-           "%.1f writes per batch, ingest: %.2f GB, %.2f MB/s\n",
-           NumberToHumanString(write_other + write_self).c_str(),
-           NumberToHumanString(num_keys_written).c_str(),
-           NumberToHumanString(write_self).c_str(),
+           "Cumulative writes: %" PRIu64 " writes, %" PRIu64 " keys, %" PRIu64
+           " batches, %.1f writes per batch, %.2f GB user ingest\n",
+           write_other + write_self, num_keys_written, write_self,
           (write_other + write_self) / static_cast<double>(write_self + 1),
-           user_bytes_written / kGB, user_bytes_written / kMB / seconds_up);
+           user_bytes_written / kGB);
  value->append(buf);
  // WAL
  snprintf(buf, sizeof(buf),
-           "Cumulative WAL: %s writes, %s syncs, "
-           "%.2f writes per sync, written: %.2f GB, %.2f MB/s\n",
-           NumberToHumanString(write_with_wal).c_str(),
-           NumberToHumanString(wal_synced).c_str(),
+           "Cumulative WAL: %" PRIu64 " writes, %" PRIu64 " syncs, "
+           "%.2f writes per sync, %.2f GB written\n",
+           write_with_wal, wal_synced,
           write_with_wal / static_cast<double>(wal_synced + 1),
-           wal_bytes / kGB, wal_bytes / kMB / seconds_up);
-  value->append(buf);
-  // Compact
-  for (int level = 0; level < number_levels_; level++) {
-    compact_bytes_read += comp_stats_[level].bytes_read_output_level +
-                          comp_stats_[level].bytes_read_non_output_levels;
-    compact_bytes_write += comp_stats_[level].bytes_written;
-    compact_micros += comp_stats_[level].micros;
-  }
-  snprintf(buf, sizeof(buf),
-           "Cumulative compaction: %.2f GB write, %.2f MB/s write, "
-           "%.2f GB read, %.2f MB/s read, %.1f seconds\n",
-           compact_bytes_write / kGB,
-           compact_bytes_write / kMB / seconds_up,
-           compact_bytes_read / kGB,
-           compact_bytes_read / kMB / seconds_up,
-           compact_micros / 1000000.0);
-  value->append(buf);
-  // Stall
-  AppendHumanMicros(write_stall_micros, human_micros, kHumanMicrosLen, true);
-  snprintf(buf, sizeof(buf),
-           "Cumulative stall: %s, %.1f percent\n",
-           human_micros,
-           // 10000 = divide by 1M to get secs, then multiply by 100 for pct
-           write_stall_micros / 10000.0 / std::max(seconds_up, 0.001));
+           wal_bytes / kGB);
  value->append(buf);

  // Interval
@@ -481,17 +323,13 @@ void InternalStats::DumpDBStats(std::string* value) {
  uint64_t interval_num_keys_written =
      num_keys_written - db_stats_snapshot_.num_keys_written;
  snprintf(buf, sizeof(buf),
-           "Interval writes: %s writes, %s keys, %s batches, "
-           "%.1f writes per batch, ingest: %.2f MB, %.2f MB/s\n",
-           NumberToHumanString(
-               interval_write_other + interval_write_self).c_str(),
-           NumberToHumanString(interval_num_keys_written).c_str(),
-           NumberToHumanString(interval_write_self).c_str(),
+           "Interval writes: %" PRIu64 " writes, %" PRIu64 " keys, %" PRIu64
+           " batches, %.1f writes per batch, %.1f MB user ingest\n",
+           interval_write_other + interval_write_self,
+           interval_num_keys_written, interval_write_self,
           static_cast<double>(interval_write_other + interval_write_self) /
               (interval_write_self + 1),
-           (user_bytes_written - db_stats_snapshot_.ingest_bytes) / kMB,
-           (user_bytes_written - db_stats_snapshot_.ingest_bytes) / kMB /
-               std::max(interval_seconds_up, 0.001)),
+           (user_bytes_written - db_stats_snapshot_.ingest_bytes) / kMB);
  value->append(buf);

  uint64_t interval_write_with_wal =
@@ -500,46 +338,13 @@ void InternalStats::DumpDBStats(std::string* value) {
  uint64_t interval_wal_bytes = wal_bytes - db_stats_snapshot_.wal_bytes;

  snprintf(buf, sizeof(buf),
-           "Interval WAL: %s writes, %s syncs, "
-           "%.2f writes per sync, written: %.2f MB, %.2f MB/s\n",
-           NumberToHumanString(interval_write_with_wal).c_str(),
-           NumberToHumanString(interval_wal_synced).c_str(),
+           "Interval WAL: %" PRIu64 " writes, %" PRIu64 " syncs, "
+           "%.2f writes per sync, %.2f MB written\n",
+           interval_write_with_wal,
+           interval_wal_synced,
           interval_write_with_wal /
              static_cast<double>(interval_wal_synced + 1),
-           interval_wal_bytes / kGB,
-           interval_wal_bytes / kMB / std::max(interval_seconds_up, 0.001));
-  value->append(buf);
-
-  // Compaction
-  uint64_t interval_compact_bytes_write =
-      compact_bytes_write - db_stats_snapshot_.compact_bytes_write;
-  uint64_t interval_compact_bytes_read =
-      compact_bytes_read - db_stats_snapshot_.compact_bytes_read;
-  uint64_t interval_compact_micros =
-      compact_micros - db_stats_snapshot_.compact_micros;
-
-  snprintf(buf, sizeof(buf),
-           "Interval compaction: %.2f GB write, %.2f MB/s write, "
-           "%.2f GB read, %.2f MB/s read, %.1f seconds\n",
-           interval_compact_bytes_write / kGB,
-           interval_compact_bytes_write / kMB /
-               std::max(interval_seconds_up, 0.001),
-           interval_compact_bytes_read / kGB,
-           interval_compact_bytes_read / kMB /
-               std::max(interval_seconds_up, 0.001),
-           interval_compact_micros / 1000000.0);
-  value->append(buf);
-
-  // Stall
-  AppendHumanMicros(
-      write_stall_micros - db_stats_snapshot_.write_stall_micros,
-      human_micros, kHumanMicrosLen, true);
-  snprintf(buf, sizeof(buf),
-           "Interval stall: %s, %.1f percent\n",
-           human_micros,
-           // 10000 = divide by 1M to get secs, then multiply by 100 for pct
-           (write_stall_micros - db_stats_snapshot_.write_stall_micros) /
-               10000.0 / std::max(interval_seconds_up, 0.001));
+           interval_wal_bytes / kGB);
  value->append(buf);

  db_stats_snapshot_.seconds_up = seconds_up;
@@ -550,17 +355,14 @@ void InternalStats::DumpDBStats(std::string* value) {
  db_stats_snapshot_.wal_bytes = wal_bytes;
  db_stats_snapshot_.wal_synced = wal_synced;
  db_stats_snapshot_.write_with_wal = write_with_wal;
-  db_stats_snapshot_.write_stall_micros = write_stall_micros;
-  db_stats_snapshot_.compact_bytes_write = compact_bytes_write;
-  db_stats_snapshot_.compact_bytes_read = compact_bytes_read;
-  db_stats_snapshot_.compact_micros = compact_micros;
 }

 void InternalStats::DumpCFStats(std::string* value) {
  const VersionStorageInfo* vstorage = cfd_->current()->storage_info();

  int num_levels_to_check =
-      (cfd_->ioptions()->compaction_style != kCompactionStyleFIFO)
+      (cfd_->options()->compaction_style != kCompactionStyleUniversal &&
+       cfd_->options()->compaction_style != kCompactionStyleFIFO)
          ? vstorage->num_levels() - 1
          : 1;

@@ -573,7 +375,7 @@ void InternalStats::DumpCFStats(std::string* value) {
  }
  // Count # of files being compacted for each level
  std::vector<int> files_being_compacted(number_levels_, 0);
-  for (int level = 0; level < number_levels_; ++level) {
+  for (int level = 0; level < num_levels_to_check; ++level) {
    for (auto* f : vstorage->LevelFiles(level)) {
      if (f->being_compacted) {
        ++files_being_compacted[level];
@@ -590,9 +392,12 @@ void InternalStats::DumpCFStats(std::string* value) {
  int total_files = 0;
  int total_files_being_compacted = 0;
  double total_file_size = 0;
+  uint64_t total_slowdown_soft = 0;
  uint64_t total_slowdown_count_soft = 0;
+  uint64_t total_slowdown_hard = 0;
  uint64_t total_slowdown_count_hard = 0;
  uint64_t total_stall_count = 0;
+  double total_stall_us = 0;
  for (int level = 0; level < number_levels_; level++) {
    int files = vstorage->NumLevelFiles(level);
    total_files += files;
@@ -605,45 +410,74 @@ void InternalStats::DumpCFStats(std::string* value) {
        : (stall_leveln_slowdown_count_soft_[level] +
           stall_leveln_slowdown_count_hard_[level]);

+      double stall_us = level == 0 ?
+         (cf_stats_value_[LEVEL0_SLOWDOWN] +
+          cf_stats_value_[LEVEL0_NUM_FILES] +
+          cf_stats_value_[MEMTABLE_COMPACTION])
+         : (stall_leveln_slowdown_soft_[level] +
+            stall_leveln_slowdown_hard_[level]);
+
      stats_sum.Add(comp_stats_[level]);
      total_file_size += vstorage->NumLevelBytes(level);
+      total_stall_us += stall_us;
      total_stall_count += stalls;
+      total_slowdown_soft += stall_leveln_slowdown_soft_[level];
      total_slowdown_count_soft += stall_leveln_slowdown_count_soft_[level];
+      total_slowdown_hard += stall_leveln_slowdown_hard_[level];
      total_slowdown_count_hard += stall_leveln_slowdown_count_hard_[level];
-      double w_amp =
-          (comp_stats_[level].bytes_read_non_output_levels == 0) ? 0.0
-          : static_cast<double>(comp_stats_[level].bytes_written) /
-            comp_stats_[level].bytes_read_non_output_levels;
-      PrintLevelStats(buf, sizeof(buf), "L" + ToString(level), files,
+      int64_t bytes_read = comp_stats_[level].bytes_readn +
+                           comp_stats_[level].bytes_readnp1;
+      double rw_amp = (comp_stats_[level].bytes_readn == 0) ? 0.0
+          : (comp_stats_[level].bytes_written + bytes_read) /
+            static_cast<double>(comp_stats_[level].bytes_readn);
+      double w_amp = (comp_stats_[level].bytes_readn == 0) ? 0.0
+          : comp_stats_[level].bytes_written /
+            static_cast<double>(comp_stats_[level].bytes_readn);
+      PrintLevelStats(buf, sizeof(buf), "L" + std::to_string(level), files,
                      files_being_compacted[level],
                      vstorage->NumLevelBytes(level), compaction_score[level],
-                      w_amp, stalls, comp_stats_[level]);
+                      rw_amp, w_amp, stall_us, stalls, comp_stats_[level]);
      value->append(buf);
    }
  }
  uint64_t curr_ingest = cf_stats_value_[BYTES_FLUSHED];
  // Cumulative summary
+  double rw_amp = (stats_sum.bytes_written + stats_sum.bytes_readn +
+      stats_sum.bytes_readnp1) / static_cast<double>(curr_ingest + 1);
  double w_amp = stats_sum.bytes_written / static_cast<double>(curr_ingest + 1);
  // Stats summary across levels
  PrintLevelStats(buf, sizeof(buf), "Sum", total_files,
-      total_files_being_compacted, total_file_size, 0, w_amp,
-      total_stall_count, stats_sum);
+      total_files_being_compacted, total_file_size, 0, rw_amp, w_amp,
+      total_stall_us, total_stall_count, stats_sum);
  value->append(buf);
  // Interval summary
  uint64_t interval_ingest =
      curr_ingest - cf_stats_snapshot_.ingest_bytes + 1;
  CompactionStats interval_stats(stats_sum);
  interval_stats.Subtract(cf_stats_snapshot_.comp_stats);
+  rw_amp = (interval_stats.bytes_written +
+      interval_stats.bytes_readn + interval_stats.bytes_readnp1) /
+      static_cast<double>(interval_ingest);
  w_amp = interval_stats.bytes_written / static_cast<double>(interval_ingest);
  PrintLevelStats(buf, sizeof(buf), "Int", 0, 0, 0, 0,
-      w_amp, total_stall_count - cf_stats_snapshot_.stall_count,
-      interval_stats);
+      rw_amp, w_amp, total_stall_us - cf_stats_snapshot_.stall_us,
+      total_stall_count - cf_stats_snapshot_.stall_count, interval_stats);
  value->append(buf);

  snprintf(buf, sizeof(buf),
-           "Flush(GB): cumulative %.3f, interval %.3f\n",
+           "Flush(GB): accumulative %.3f, interval %.3f\n",
           curr_ingest / kGB, interval_ingest / kGB);
  value->append(buf);
+  snprintf(buf, sizeof(buf),
+           "Stalls(secs): %.3f level0_slowdown, %.3f level0_numfiles, "
+           "%.3f memtable_compaction, %.3f leveln_slowdown_soft, "
+           "%.3f leveln_slowdown_hard\n",
+           cf_stats_value_[LEVEL0_SLOWDOWN] / 1000000.0,
+           cf_stats_value_[LEVEL0_NUM_FILES] / 1000000.0,
+           cf_stats_value_[MEMTABLE_COMPACTION] / 1000000.0,
+           total_slowdown_soft / 1000000.0,
+           total_slowdown_hard / 1000000.0);
+  value->append(buf);

  snprintf(buf, sizeof(buf),
           "Stalls(count): %" PRIu64 " level0_slowdown, "
@@ -658,17 +492,8 @@ void InternalStats::DumpCFStats(std::string* value) {

  cf_stats_snapshot_.ingest_bytes = curr_ingest;
  cf_stats_snapshot_.comp_stats = stats_sum;
+  cf_stats_snapshot_.stall_us = total_stall_us;
  cf_stats_snapshot_.stall_count = total_stall_count;
 }

-
-#else
-
-DBPropertyType GetPropertyType(const Slice& property, bool* is_int_property,
-                               bool* need_out_of_mutex) {
-  return kUnknown;
-}
-
-#endif  // !ROCKSDB_LITE
-
 }  // namespace rocksdb
@@ -21,8 +21,6 @@ namespace rocksdb {
 class MemTableList;
 class DBImpl;

-// IMPORTANT: If you add a new property here, also add it to the list in
-//            include/rocksdb/db.h
 enum DBPropertyType : uint32_t {
  kUnknown,
  kNumFilesAtLevel,  // Number of files at a specific level
@@ -32,42 +30,28 @@ enum DBPropertyType : uint32_t {
  kStats,            // Return general statitistics of both DB and CF
  kSsTables,         // Return a human readable string of current SST files
  kStartIntTypes,    // ---- Dummy value to indicate the start of integer values
-  kNumImmutableMemTable,         // Return number of immutable mem tables that
-                                 // have not been flushed.
-  kNumImmutableMemTableFlushed,  // Return number of immutable mem tables
-                                 // in memory that have already been flushed
-  kMemtableFlushPending,         // Return 1 if mem table flushing is pending,
-                                 // otherwise 0.
+  kNumImmutableMemTable,   // Return number of immutable mem tables
+  kMemtableFlushPending,   // Return 1 if mem table flushing is pending,
+                           // otherwise 0.
  kCompactionPending,      // Return 1 if a compaction is pending. Otherwise 0.
  kBackgroundErrors,       // Return accumulated background errors encountered.
  kCurSizeActiveMemTable,  // Return current size of the active memtable
  kCurSizeAllMemTables,    // Return current size of all (active + immutable)
                           // memtables
-  kNumEntriesInMutableMemtable,    // Return number of deletes in the mutable
+  kNumEntriesInMutableMemtable,    // Return number of entries in the mutable
                                   // memtable.
  kNumEntriesInImmutableMemtable,  // Return sum of number of entries in all
                                   // the immutable mem tables.
-  kNumDeletesInMutableMemtable,    // Return number of entries in the mutable
-                                   // memtable.
-  kNumDeletesInImmutableMemtable,  // Return sum of number of deletes in all
-                                   // the immutable mem tables.
  kEstimatedNumKeys,  // Estimated total number of keys in the database.
  kEstimatedUsageByTableReaders,  // Estimated memory by table readers.
  kIsFileDeletionEnabled,         // Equals disable_delete_obsolete_files_,
                                  // 0 means file deletions enabled
-  kNumSnapshots,                  // Number of snapshots in the system
-  kOldestSnapshotTime,            // Unix timestamp of the first snapshot
-  kNumLiveVersions,
-  kEstimateLiveDataSize,          // Estimated amount of live data in bytes
-  kBaseLevel,  // The level that L0 data is compacted to
 };

 extern DBPropertyType GetPropertyType(const Slice& property,
                                      bool* is_int_property,
                                      bool* need_out_of_mutex);

-
-#ifndef ROCKSDB_LITE
 class InternalStats {
 public:
  enum InternalCFStatsType {
@@ -87,7 +71,6 @@ class InternalStats {
    WRITE_DONE_BY_OTHER,
    WRITE_DONE_BY_SELF,
    WRITE_WITH_WAL,
-    WRITE_STALL_MICROS,
    INTERNAL_DB_STATS_ENUM_MAX,
  };

@@ -96,7 +79,9 @@ class InternalStats {
        cf_stats_value_(INTERNAL_CF_STATS_ENUM_MAX),
        cf_stats_count_(INTERNAL_CF_STATS_ENUM_MAX),
        comp_stats_(num_levels),
+        stall_leveln_slowdown_hard_(num_levels),
        stall_leveln_slowdown_count_hard_(num_levels),
+        stall_leveln_slowdown_soft_(num_levels),
        stall_leveln_slowdown_count_soft_(num_levels),
        bg_error_count_(0),
        number_levels_(num_levels),
@@ -111,7 +96,9 @@ class InternalStats {
      cf_stats_count_[i] = 0;
    }
    for (int i = 0; i < num_levels; ++i) {
+      stall_leveln_slowdown_hard_[i] = 0;
      stall_leveln_slowdown_count_hard_[i] = 0;
+      stall_leveln_slowdown_soft_[i] = 0;
      stall_leveln_slowdown_count_soft_[i] = 0;
    }
  }
@@ -121,26 +108,23 @@ class InternalStats {
  struct CompactionStats {
    uint64_t micros;

-    // The number of bytes read from all non-output levels
-    uint64_t bytes_read_non_output_levels;
+    // Bytes read from level N during compaction between levels N and N+1
+    uint64_t bytes_readn;

-    // The number of bytes read from the compaction output level.
-    uint64_t bytes_read_output_level;
+    // Bytes read from level N+1 during compaction between levels N and N+1
+    uint64_t bytes_readnp1;

-    // Total number of bytes written during compaction
+    // Total bytes written during compaction between levels N and N+1
    uint64_t bytes_written;

-    // Total number of bytes moved to the output level
-    uint64_t bytes_moved;
+    // Files read from level N during compaction between levels N and N+1
+    int files_in_leveln;

-    // The number of compaction input files in all non-output levels.
-    int num_input_files_in_non_output_levels;
+    // Files read from level N+1 during compaction between levels N and N+1
+    int files_in_levelnp1;

-    // The number of compaction input files in the output level.
-    int num_input_files_in_output_level;
-
-    // The number of compaction output files.
-    int num_output_files;
+    // Files written during compaction between levels N and N+1
+    int files_out_levelnp1;

    // Total incoming entries during compaction between levels N and N+1
    uint64_t num_input_records;
@@ -154,43 +138,36 @@ class InternalStats {

    explicit CompactionStats(int _count = 0)
        : micros(0),
-          bytes_read_non_output_levels(0),
-          bytes_read_output_level(0),
+          bytes_readn(0),
+          bytes_readnp1(0),
          bytes_written(0),
-          bytes_moved(0),
-          num_input_files_in_non_output_levels(0),
-          num_input_files_in_output_level(0),
-          num_output_files(0),
+          files_in_leveln(0),
+          files_in_levelnp1(0),
+          files_out_levelnp1(0),
          num_input_records(0),
          num_dropped_records(0),
          count(_count) {}

    explicit CompactionStats(const CompactionStats& c)
        : micros(c.micros),
-          bytes_read_non_output_levels(c.bytes_read_non_output_levels),
-          bytes_read_output_level(c.bytes_read_output_level),
+          bytes_readn(c.bytes_readn),
+          bytes_readnp1(c.bytes_readnp1),
          bytes_written(c.bytes_written),
-          bytes_moved(c.bytes_moved),
-          num_input_files_in_non_output_levels(
-              c.num_input_files_in_non_output_levels),
-          num_input_files_in_output_level(
-              c.num_input_files_in_output_level),
-          num_output_files(c.num_output_files),
+          files_in_leveln(c.files_in_leveln),
+          files_in_levelnp1(c.files_in_levelnp1),
+          files_out_levelnp1(c.files_out_levelnp1),
          num_input_records(c.num_input_records),
          num_dropped_records(c.num_dropped_records),
          count(c.count) {}

    void Add(const CompactionStats& c) {
      this->micros += c.micros;
-      this->bytes_read_non_output_levels += c.bytes_read_non_output_levels;
-      this->bytes_read_output_level += c.bytes_read_output_level;
+      this->bytes_readn += c.bytes_readn;
+      this->bytes_readnp1 += c.bytes_readnp1;
      this->bytes_written += c.bytes_written;
-      this->bytes_moved += c.bytes_moved;
-      this->num_input_files_in_non_output_levels +=
-          c.num_input_files_in_non_output_levels;
-      this->num_input_files_in_output_level +=
-          c.num_input_files_in_output_level;
-      this->num_output_files += c.num_output_files;
+      this->files_in_leveln += c.files_in_leveln;
+      this->files_in_levelnp1 += c.files_in_levelnp1;
+      this->files_out_levelnp1 += c.files_out_levelnp1;
      this->num_input_records += c.num_input_records;
      this->num_dropped_records += c.num_dropped_records;
      this->count += c.count;
@@ -198,15 +175,12 @@ class InternalStats {

    void Subtract(const CompactionStats& c) {
      this->micros -= c.micros;
-      this->bytes_read_non_output_levels -= c.bytes_read_non_output_levels;
-      this->bytes_read_output_level -= c.bytes_read_output_level;
+      this->bytes_readn -= c.bytes_readn;
+      this->bytes_readnp1 -= c.bytes_readnp1;
      this->bytes_written -= c.bytes_written;
-      this->bytes_moved -= c.bytes_moved;
-      this->num_input_files_in_non_output_levels -=
-          c.num_input_files_in_non_output_levels;
-      this->num_input_files_in_output_level -=
-          c.num_input_files_in_output_level;
-      this->num_output_files -= c.num_output_files;
+      this->files_in_leveln -= c.files_in_leveln;
+      this->files_in_levelnp1 -= c.files_in_levelnp1;
+      this->files_out_levelnp1 -= c.files_out_levelnp1;
      this->num_input_records -= c.num_input_records;
      this->num_dropped_records -= c.num_dropped_records;
      this->count -= c.count;
@@ -217,14 +191,12 @@ class InternalStats {
    comp_stats_[level].Add(stats);
  }

-  void IncBytesMoved(int level, uint64_t amount) {
-    comp_stats_[level].bytes_moved += amount;
-  }
-
-  void RecordLevelNSlowdown(int level, bool soft) {
+  void RecordLevelNSlowdown(int level, uint64_t micros, bool soft) {
    if (soft) {
+      stall_leveln_slowdown_soft_[level] += micros;
      ++stall_leveln_slowdown_count_soft_[level];
    } else {
+      stall_leveln_slowdown_hard_[level] += micros;
      ++stall_leveln_slowdown_count_hard_[level];
    }
  }
@@ -263,7 +235,9 @@ class InternalStats {
  // Per-ColumnFamily/level compaction stats
  std::vector<CompactionStats> comp_stats_;
  // These count the number of microseconds for which MakeRoomForWrite stalls.
+  std::vector<uint64_t> stall_leveln_slowdown_hard_;
  std::vector<uint64_t> stall_leveln_slowdown_count_hard_;
+  std::vector<uint64_t> stall_leveln_slowdown_soft_;
  std::vector<uint64_t> stall_leveln_slowdown_count_soft_;

  // Used to compute per-interval statistics
@@ -271,11 +245,13 @@ class InternalStats {
    // ColumnFamily-level stats
    CompactionStats comp_stats;
    uint64_t ingest_bytes;            // Bytes written to L0
+    uint64_t stall_us;                // Stall time in micro-seconds
    uint64_t stall_count;             // Stall count

    CFStatsSnapshot()
        : comp_stats(0),
          ingest_bytes(0),
+          stall_us(0),
          stall_count(0) {}
  } cf_stats_snapshot_;

@@ -289,17 +265,11 @@ class InternalStats {
    // another thread.
    uint64_t write_other;
    uint64_t write_self;
-    // Stats from compaction jobs - bytes written, bytes read, duration.
-    uint64_t compact_bytes_write;
-    uint64_t compact_bytes_read;
-    uint64_t compact_micros;
    // Total number of keys written. write_self and write_other measure number
    // of write requests written, Each of the write request can contain updates
    // to multiple keys. num_keys_written is total number of keys updated by all
    // those writes.
    uint64_t num_keys_written;
-    // Total time writes delayed by stalls.
-    uint64_t write_stall_micros;
    double seconds_up;

    DBStatsSnapshot()
@@ -309,11 +279,7 @@ class InternalStats {
          write_with_wal(0),
          write_other(0),
          write_self(0),
-          compact_bytes_write(0),
-          compact_bytes_read(0),
-          compact_micros(0),
          num_keys_written(0),
-          write_stall_micros(0),
          seconds_up(0) {}
  } db_stats_snapshot_;

@@ -330,78 +296,4 @@ class InternalStats {
  const uint64_t started_at_;
 };

-#else
-
-class InternalStats {
- public:
-  enum InternalCFStatsType {
-    LEVEL0_SLOWDOWN,
-    MEMTABLE_COMPACTION,
-    LEVEL0_NUM_FILES,
-    WRITE_STALLS_ENUM_MAX,
-    BYTES_FLUSHED,
-    INTERNAL_CF_STATS_ENUM_MAX,
-  };
-
-  enum InternalDBStatsType {
-    WAL_FILE_BYTES,
-    WAL_FILE_SYNCED,
-    BYTES_WRITTEN,
-    NUMBER_KEYS_WRITTEN,
-    WRITE_DONE_BY_OTHER,
-    WRITE_DONE_BY_SELF,
-    WRITE_WITH_WAL,
-    WRITE_STALL_MICROS,
-    INTERNAL_DB_STATS_ENUM_MAX,
-  };
-
-  InternalStats(int num_levels, Env* env, ColumnFamilyData* cfd) {}
-
-  struct CompactionStats {
-    uint64_t micros;
-    uint64_t bytes_read_non_output_levels;
-    uint64_t bytes_read_output_level;
-    uint64_t bytes_written;
-    uint64_t bytes_moved;
-    int num_input_files_in_non_output_levels;
-    int num_input_files_in_output_level;
-    int num_output_files;
-    uint64_t num_input_records;
-    uint64_t num_dropped_records;
-    int count;
-
-    explicit CompactionStats(int _count = 0) {}
-
-    explicit CompactionStats(const CompactionStats& c) {}
-
-    void Add(const CompactionStats& c) {}
-
-    void Subtract(const CompactionStats& c) {}
-  };
-
-  void AddCompactionStats(int level, const CompactionStats& stats) {}
-
-  void IncBytesMoved(int level, uint64_t amount) {}
-
-  void RecordLevelNSlowdown(int level, bool soft) {}
-
-  void AddCFStats(InternalCFStatsType type, uint64_t value) {}
-
-  void AddDBStats(InternalDBStatsType type, uint64_t value) {}
-
-  uint64_t GetBackgroundErrorCount() const { return 0; }
-
-  uint64_t BumpAndGetBackgroundErrorCount() { return 0; }
-
-  bool GetStringProperty(DBPropertyType property_type, const Slice& property,
-                         std::string* value) { return false; }
-
-  bool GetIntProperty(DBPropertyType property_type, uint64_t* value,
-                      DBImpl* db) const { return false; }
-
-  bool GetIntPropertyOutOfMutex(DBPropertyType property_type, Version* version,
-                                uint64_t* value) const { return false; }
-};
-#endif  // !ROCKSDB_LITE
-
 }  // namespace rocksdb
@@ -13,7 +13,6 @@
 #include <vector>

 #include "db/column_family.h"
-#include "db/log_writer.h"

 namespace rocksdb {

@@ -21,10 +20,8 @@ class MemTable;

 struct JobContext {
  inline bool HaveSomethingToDelete() const {
-    return full_scan_candidate_files.size() || sst_delete_files.size() ||
-           log_delete_files.size() || new_superversion != nullptr ||
-           superversions_to_free.size() > 0 || memtables_to_free.size() > 0 ||
-           logs_to_free.size() > 0;
+    return candidate_files.size() || sst_delete_files.size() ||
+           log_delete_files.size();
  }

  // Structure to store information for candidate files to delete.
@@ -38,14 +35,10 @@ struct JobContext {
    }
  };

-  // Unique job id
-  int job_id;
-
  // a list of all files that we'll consider deleting
  // (every once in a while this is filled up with all files
  // in the DB directory)
-  // (filled only if we're doing full scan)
-  std::vector<CandidateFileInfo> full_scan_candidate_files;
+  std::vector<CandidateFileInfo> candidate_files;

  // the list of all live sst files that cannot be deleted
  std::vector<FileDescriptor> sst_live;
@@ -61,21 +54,14 @@ struct JobContext {

  autovector<SuperVersion*> superversions_to_free;

-  autovector<log::Writer*> logs_to_free;
-
  SuperVersion* new_superversion;  // if nullptr no new superversion

  // the current manifest_file_number, log_number and prev_log_number
  // that corresponds to the set of files in 'live'.
-  uint64_t manifest_file_number;
-  uint64_t pending_manifest_file_number;
-  uint64_t log_number;
-  uint64_t prev_log_number;
+  uint64_t manifest_file_number, pending_manifest_file_number, log_number,
+      prev_log_number;

-  uint64_t min_pending_output = 0;
-
-  explicit JobContext(int _job_id, bool create_superversion = false) {
-    job_id = _job_id;
+  explicit JobContext(bool create_superversion = false) {
    manifest_file_number = 0;
    pending_manifest_file_number = 0;
    log_number = 0;
@@ -83,11 +69,7 @@ struct JobContext {
    new_superversion = create_superversion ? new SuperVersion() : nullptr;
  }

-  // For non-empty JobContext Clean() has to be called at least once before
-  // before destruction (see asserts in ~JobContext()). Should be called with
-  // unlocked DB mutex. Destructor doesn't call Clean() to avoid accidentally
-  // doing potentially slow Clean() with locked DB mutex.
-  void Clean() {
+  ~JobContext() {
    // free pending memtables
    for (auto m : memtables_to_free) {
      delete m;
@@ -96,24 +78,9 @@ struct JobContext {
    for (auto s : superversions_to_free) {
      delete s;
    }
-    for (auto l : logs_to_free) {
-      delete l;
-    }
    // if new_superversion was not used, it will be non-nullptr and needs
    // to be freed here
    delete new_superversion;
-
-    memtables_to_free.clear();
-    superversions_to_free.clear();
-    logs_to_free.clear();
-    new_superversion = nullptr;
-  }
-
-  ~JobContext() {
-    assert(memtables_to_free.size() == 0);
-    assert(superversions_to_free.size() == 0);
-    assert(new_superversion == nullptr);
-    assert(logs_to_free.size() == 0);
  }
 };

@@ -1,477 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-#include "db/dbformat.h"
-#include "db/db_impl.h"
-#include "db/filename.h"
-#include "db/version_set.h"
-#include "db/write_batch_internal.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/compaction_filter.h"
-#include "rocksdb/db.h"
-#include "rocksdb/env.h"
-#include "rocksdb/filter_policy.h"
-#include "rocksdb/perf_context.h"
-#include "rocksdb/slice.h"
-#include "rocksdb/slice_transform.h"
-#include "rocksdb/table.h"
-#include "rocksdb/options.h"
-#include "rocksdb/table_properties.h"
-#include "table/block_based_table_factory.h"
-#include "table/plain_table_factory.h"
-#include "util/hash.h"
-#include "util/hash_linklist_rep.h"
-#include "utilities/merge_operators.h"
-#include "util/logging.h"
-#include "util/mutexlock.h"
-#include "util/rate_limiter.h"
-#include "util/statistics.h"
-#include "util/string_util.h"
-#include "util/testharness.h"
-#include "util/sync_point.h"
-#include "util/testutil.h"
-
-#ifndef ROCKSDB_LITE
-
-namespace rocksdb {
-
-class EventListenerTest : public testing::Test {
- public:
-  EventListenerTest() {
-    dbname_ = test::TmpDir() + "/listener_test";
-    EXPECT_OK(DestroyDB(dbname_, Options()));
-    db_ = nullptr;
-    Reopen();
-  }
-
-  ~EventListenerTest() {
-    Close();
-    Options options;
-    options.db_paths.emplace_back(dbname_, 0);
-    options.db_paths.emplace_back(dbname_ + "_2", 0);
-    options.db_paths.emplace_back(dbname_ + "_3", 0);
-    options.db_paths.emplace_back(dbname_ + "_4", 0);
-    EXPECT_OK(DestroyDB(dbname_, options));
-  }
-
-  void CreateColumnFamilies(const std::vector<std::string>& cfs,
-                            const ColumnFamilyOptions* options = nullptr) {
-    ColumnFamilyOptions cf_opts;
-    cf_opts = ColumnFamilyOptions(Options());
-    size_t cfi = handles_.size();
-    handles_.resize(cfi + cfs.size());
-    for (auto cf : cfs) {
-      ASSERT_OK(db_->CreateColumnFamily(cf_opts, cf, &handles_[cfi++]));
-    }
-  }
-
-  void Close() {
-    for (auto h : handles_) {
-      delete h;
-    }
-    handles_.clear();
-    delete db_;
-    db_ = nullptr;
-  }
-
-  void ReopenWithColumnFamilies(const std::vector<std::string>& cfs,
-                                const Options* options = nullptr) {
-    ASSERT_OK(TryReopenWithColumnFamilies(cfs, options));
-  }
-
-  Status TryReopenWithColumnFamilies(const std::vector<std::string>& cfs,
-                                     const Options* options = nullptr) {
-    Close();
-    Options opts = (options == nullptr) ? Options() : *options;
-    std::vector<const Options*> v_opts(cfs.size(), &opts);
-    return TryReopenWithColumnFamilies(cfs, v_opts);
-  }
-
-  Status TryReopenWithColumnFamilies(
-      const std::vector<std::string>& cfs,
-      const std::vector<const Options*>& options) {
-    Close();
-    EXPECT_EQ(cfs.size(), options.size());
-    std::vector<ColumnFamilyDescriptor> column_families;
-    for (size_t i = 0; i < cfs.size(); ++i) {
-      column_families.push_back(ColumnFamilyDescriptor(cfs[i], *options[i]));
-    }
-    DBOptions db_opts = DBOptions(*options[0]);
-    return DB::Open(db_opts, dbname_, column_families, &handles_, &db_);
-  }
-
-  Status TryReopen(Options* options = nullptr) {
-    Close();
-    Options opts;
-    if (options != nullptr) {
-      opts = *options;
-    } else {
-      opts.create_if_missing = true;
-    }
-
-    return DB::Open(opts, dbname_, &db_);
-  }
-
-  void Reopen(Options* options = nullptr) {
-    ASSERT_OK(TryReopen(options));
-  }
-
-  void CreateAndReopenWithCF(const std::vector<std::string>& cfs,
-                             const Options* options = nullptr) {
-    CreateColumnFamilies(cfs, options);
-    std::vector<std::string> cfs_plus_default = cfs;
-    cfs_plus_default.insert(cfs_plus_default.begin(), kDefaultColumnFamilyName);
-    ReopenWithColumnFamilies(cfs_plus_default, options);
-  }
-
-  DBImpl* dbfull() {
-    return reinterpret_cast<DBImpl*>(db_);
-  }
-
-  Status Put(int cf, const Slice& k, const Slice& v,
-             WriteOptions wo = WriteOptions()) {
-    return db_->Put(wo, handles_[cf], k, v);
-  }
-
-  Status Flush(int cf = 0) {
-    FlushOptions opt = FlushOptions();
-    opt.wait = true;
-    if (cf == 0) {
-      return db_->Flush(opt);
-    } else {
-      return db_->Flush(opt, handles_[cf]);
-    }
-  }
-
-  DB* db_;
-  std::string dbname_;
-  std::vector<ColumnFamilyHandle*> handles_;
-};
-
-class TestCompactionListener : public EventListener {
- public:
-  void OnCompactionCompleted(DB *db, const CompactionJobInfo& ci) override {
-    std::lock_guard<std::mutex> lock(mutex_);
-    compacted_dbs_.push_back(db);
-    ASSERT_GT(ci.input_files.size(), 0U);
-    ASSERT_GT(ci.output_files.size(), 0U);
-    ASSERT_EQ(db->GetEnv()->GetThreadID(), ci.thread_id);
-    ASSERT_GT(ci.thread_id, 0U);
-  }
-
-  std::vector<DB*> compacted_dbs_;
-  std::mutex mutex_;
-};
-
-TEST_F(EventListenerTest, OnSingleDBCompactionTest) {
-  const int kTestKeySize = 16;
-  const int kTestValueSize = 984;
-  const int kEntrySize = kTestKeySize + kTestValueSize;
-  const int kEntriesPerBuffer = 100;
-  const int kNumL0Files = 4;
-
-  Options options;
-  options.create_if_missing = true;
-  options.write_buffer_size = kEntrySize * kEntriesPerBuffer;
-  options.compaction_style = kCompactionStyleLevel;
-  options.target_file_size_base = options.write_buffer_size;
-  options.max_bytes_for_level_base = options.target_file_size_base * 2;
-  options.max_bytes_for_level_multiplier = 2;
-  options.compression = kNoCompression;
-#if ROCKSDB_USING_THREAD_STATUS
-  options.enable_thread_tracking = true;
-#endif  // ROCKSDB_USING_THREAD_STATUS
-  options.level0_file_num_compaction_trigger = kNumL0Files;
-
-  TestCompactionListener* listener = new TestCompactionListener();
-  options.listeners.emplace_back(listener);
-  std::vector<std::string> cf_names = {
-      "pikachu", "ilya", "muromec", "dobrynia",
-      "nikitich", "alyosha", "popovich"};
-  CreateAndReopenWithCF(cf_names, &options);
-  ASSERT_OK(Put(1, "pikachu", std::string(90000, 'p')));
-  ASSERT_OK(Put(2, "ilya", std::string(90000, 'i')));
-  ASSERT_OK(Put(3, "muromec", std::string(90000, 'm')));
-  ASSERT_OK(Put(4, "dobrynia", std::string(90000, 'd')));
-  ASSERT_OK(Put(5, "nikitich", std::string(90000, 'n')));
-  ASSERT_OK(Put(6, "alyosha", std::string(90000, 'a')));
-  ASSERT_OK(Put(7, "popovich", std::string(90000, 'p')));
-  for (size_t i = 1; i < 8; ++i) {
-    ASSERT_OK(Flush(static_cast<int>(i)));
-    const Slice kStart = "a";
-    const Slice kEnd = "z";
-    ASSERT_OK(dbfull()->CompactRange(CompactRangeOptions(), handles_[i],
-                                     &kStart, &kEnd));
-    dbfull()->TEST_WaitForFlushMemTable();
-    dbfull()->TEST_WaitForCompact();
-  }
-
-  ASSERT_EQ(listener->compacted_dbs_.size(), cf_names.size());
-  for (size_t i = 0; i < cf_names.size(); ++i) {
-    ASSERT_EQ(listener->compacted_dbs_[i], db_);
-  }
-}
-
-// This simple Listener can only handle one flush at a time.
-class TestFlushListener : public EventListener {
- public:
-  explicit TestFlushListener(Env* env)
-      : slowdown_count(0), stop_count(0), db_closed(), env_(env) {
-    db_closed = false;
-  }
-  void OnTableFileCreated(
-      const TableFileCreationInfo& info) override {
-    // remember the info for later checking the FlushJobInfo.
-    prev_fc_info_ = info;
-    ASSERT_GT(info.db_name.size(), 0U);
-    ASSERT_GT(info.cf_name.size(), 0U);
-    ASSERT_GT(info.file_path.size(), 0U);
-    ASSERT_GT(info.job_id, 0);
-    ASSERT_GT(info.table_properties.data_size, 0U);
-    ASSERT_GT(info.table_properties.raw_key_size, 0U);
-    ASSERT_GT(info.table_properties.raw_value_size, 0U);
-    ASSERT_GT(info.table_properties.num_data_blocks, 0U);
-    ASSERT_GT(info.table_properties.num_entries, 0U);
-
-#if ROCKSDB_USING_THREAD_STATUS
-    // Verify the id of the current thread that created this table
-    // file matches the id of any active flush or compaction thread.
-    uint64_t thread_id = env_->GetThreadID();
-    std::vector<ThreadStatus> thread_list;
-    ASSERT_OK(env_->GetThreadList(&thread_list));
-    bool found_match = false;
-    for (auto thread_status : thread_list) {
-      if (thread_status.operation_type == ThreadStatus::OP_FLUSH ||
-          thread_status.operation_type == ThreadStatus::OP_COMPACTION) {
-        if (thread_id == thread_status.thread_id) {
-          found_match = true;
-          break;
-        }
-      }
-    }
-    ASSERT_TRUE(found_match);
-#endif  // ROCKSDB_USING_THREAD_STATUS
-  }
-
-  void OnFlushCompleted(
-      DB* db, const FlushJobInfo& info) override {
-    flushed_dbs_.push_back(db);
-    flushed_column_family_names_.push_back(info.cf_name);
-    if (info.triggered_writes_slowdown) {
-      slowdown_count++;
-    }
-    if (info.triggered_writes_stop) {
-      stop_count++;
-    }
-    // verify whether the previously created file matches the flushed file.
-    ASSERT_EQ(prev_fc_info_.db_name, db->GetName());
-    ASSERT_EQ(prev_fc_info_.cf_name, info.cf_name);
-    ASSERT_EQ(prev_fc_info_.job_id, info.job_id);
-    ASSERT_EQ(prev_fc_info_.file_path, info.file_path);
-    ASSERT_EQ(db->GetEnv()->GetThreadID(), info.thread_id);
-    ASSERT_GT(info.thread_id, 0U);
-  }
-
-  std::vector<std::string> flushed_column_family_names_;
-  std::vector<DB*> flushed_dbs_;
-  int slowdown_count;
-  int stop_count;
-  bool db_closing;
-  std::atomic_bool db_closed;
-  TableFileCreationInfo prev_fc_info_;
-
- protected:
-  Env* env_;
-};
-
-TEST_F(EventListenerTest, OnSingleDBFlushTest) {
-  Options options;
-  options.write_buffer_size = 100000;
-#if ROCKSDB_USING_THREAD_STATUS
-  options.enable_thread_tracking = true;
-#endif  // ROCKSDB_USING_THREAD_STATUS
-  TestFlushListener* listener = new TestFlushListener(options.env);
-  options.listeners.emplace_back(listener);
-  std::vector<std::string> cf_names = {
-      "pikachu", "ilya", "muromec", "dobrynia",
-      "nikitich", "alyosha", "popovich"};
-  CreateAndReopenWithCF(cf_names, &options);
-
-  ASSERT_OK(Put(1, "pikachu", std::string(90000, 'p')));
-  ASSERT_OK(Put(2, "ilya", std::string(90000, 'i')));
-  ASSERT_OK(Put(3, "muromec", std::string(90000, 'm')));
-  ASSERT_OK(Put(4, "dobrynia", std::string(90000, 'd')));
-  ASSERT_OK(Put(5, "nikitich", std::string(90000, 'n')));
-  ASSERT_OK(Put(6, "alyosha", std::string(90000, 'a')));
-  ASSERT_OK(Put(7, "popovich", std::string(90000, 'p')));
-  for (size_t i = 1; i < 8; ++i) {
-    ASSERT_OK(Flush(static_cast<int>(i)));
-    dbfull()->TEST_WaitForFlushMemTable();
-    ASSERT_EQ(listener->flushed_dbs_.size(), i);
-    ASSERT_EQ(listener->flushed_column_family_names_.size(), i);
-  }
-
-  // make sure call-back functions are called in the right order
-  for (size_t i = 0; i < cf_names.size(); ++i) {
-    ASSERT_EQ(listener->flushed_dbs_[i], db_);
-    ASSERT_EQ(listener->flushed_column_family_names_[i], cf_names[i]);
-  }
-}
-
-TEST_F(EventListenerTest, MultiCF) {
-  Options options;
-  options.write_buffer_size = 100000;
-#if ROCKSDB_USING_THREAD_STATUS
-  options.enable_thread_tracking = true;
-#endif  // ROCKSDB_USING_THREAD_STATUS
-  TestFlushListener* listener = new TestFlushListener(options.env);
-  options.listeners.emplace_back(listener);
-  std::vector<std::string> cf_names = {
-      "pikachu", "ilya", "muromec", "dobrynia",
-      "nikitich", "alyosha", "popovich"};
-  CreateAndReopenWithCF(cf_names, &options);
-
-  ASSERT_OK(Put(1, "pikachu", std::string(90000, 'p')));
-  ASSERT_OK(Put(2, "ilya", std::string(90000, 'i')));
-  ASSERT_OK(Put(3, "muromec", std::string(90000, 'm')));
-  ASSERT_OK(Put(4, "dobrynia", std::string(90000, 'd')));
-  ASSERT_OK(Put(5, "nikitich", std::string(90000, 'n')));
-  ASSERT_OK(Put(6, "alyosha", std::string(90000, 'a')));
-  ASSERT_OK(Put(7, "popovich", std::string(90000, 'p')));
-  for (size_t i = 1; i < 8; ++i) {
-    ASSERT_OK(Flush(static_cast<int>(i)));
-    ASSERT_EQ(listener->flushed_dbs_.size(), i);
-    ASSERT_EQ(listener->flushed_column_family_names_.size(), i);
-  }
-
-  // make sure call-back functions are called in the right order
-  for (size_t i = 0; i < cf_names.size(); i++) {
-    ASSERT_EQ(listener->flushed_dbs_[i], db_);
-    ASSERT_EQ(listener->flushed_column_family_names_[i], cf_names[i]);
-  }
-}
-
-TEST_F(EventListenerTest, MultiDBMultiListeners) {
-  Options options;
-#if ROCKSDB_USING_THREAD_STATUS
-  options.enable_thread_tracking = true;
-#endif  // ROCKSDB_USING_THREAD_STATUS
-  std::vector<TestFlushListener*> listeners;
-  const int kNumDBs = 5;
-  const int kNumListeners = 10;
-  for (int i = 0; i < kNumListeners; ++i) {
-    listeners.emplace_back(new TestFlushListener(options.env));
-  }
-
-  std::vector<std::string> cf_names = {
-      "pikachu", "ilya", "muromec", "dobrynia",
-      "nikitich", "alyosha", "popovich"};
-
-  options.create_if_missing = true;
-  for (int i = 0; i < kNumListeners; ++i) {
-    options.listeners.emplace_back(listeners[i]);
-  }
-  DBOptions db_opts(options);
-  ColumnFamilyOptions cf_opts(options);
-
-  std::vector<DB*> dbs;
-  std::vector<std::vector<ColumnFamilyHandle *>> vec_handles;
-
-  for (int d = 0; d < kNumDBs; ++d) {
-    ASSERT_OK(DestroyDB(dbname_ + ToString(d), options));
-    DB* db;
-    std::vector<ColumnFamilyHandle*> handles;
-    ASSERT_OK(DB::Open(options, dbname_ + ToString(d), &db));
-    for (size_t c = 0; c < cf_names.size(); ++c) {
-      ColumnFamilyHandle* handle;
-      db->CreateColumnFamily(cf_opts, cf_names[c], &handle);
-      handles.push_back(handle);
-    }
-
-    vec_handles.push_back(std::move(handles));
-    dbs.push_back(db);
-  }
-
-  for (int d = 0; d < kNumDBs; ++d) {
-    for (size_t c = 0; c < cf_names.size(); ++c) {
-      ASSERT_OK(dbs[d]->Put(WriteOptions(), vec_handles[d][c],
-                cf_names[c], cf_names[c]));
-    }
-  }
-
-  for (size_t c = 0; c < cf_names.size(); ++c) {
-    for (int d = 0; d < kNumDBs; ++d) {
-      ASSERT_OK(dbs[d]->Flush(FlushOptions(), vec_handles[d][c]));
-      reinterpret_cast<DBImpl*>(dbs[d])->TEST_WaitForFlushMemTable();
-    }
-  }
-
-  for (auto* listener : listeners) {
-    int pos = 0;
-    for (size_t c = 0; c < cf_names.size(); ++c) {
-      for (int d = 0; d < kNumDBs; ++d) {
-        ASSERT_EQ(listener->flushed_dbs_[pos], dbs[d]);
-        ASSERT_EQ(listener->flushed_column_family_names_[pos], cf_names[c]);
-        pos++;
-      }
-    }
-  }
-
-
-  for (auto handles : vec_handles) {
-    for (auto h : handles) {
-      delete h;
-    }
-    handles.clear();
-  }
-  vec_handles.clear();
-
-  for (auto db : dbs) {
-    delete db;
-  }
-}
-
-TEST_F(EventListenerTest, DisableBGCompaction) {
-  Options options;
-#if ROCKSDB_USING_THREAD_STATUS
-  options.enable_thread_tracking = true;
-#endif  // ROCKSDB_USING_THREAD_STATUS
-  TestFlushListener* listener = new TestFlushListener(options.env);
-  const int kCompactionTrigger = 1;
-  const int kSlowdownTrigger = 5;
-  const int kStopTrigger = 100;
-  options.level0_file_num_compaction_trigger = kCompactionTrigger;
-  options.level0_slowdown_writes_trigger = kSlowdownTrigger;
-  options.level0_stop_writes_trigger = kStopTrigger;
-  options.max_write_buffer_number = 10;
-  options.listeners.emplace_back(listener);
-  // BG compaction is disabled.  Number of L0 files will simply keeps
-  // increasing in this test.
-  options.compaction_style = kCompactionStyleNone;
-  options.compression = kNoCompression;
-  options.write_buffer_size = 100000;  // Small write buffer
-
-  CreateAndReopenWithCF({"pikachu"}, &options);
-  ColumnFamilyMetaData cf_meta;
-  db_->GetColumnFamilyMetaData(handles_[1], &cf_meta);
-
-  // keep writing until writes are forced to stop.
-  for (int i = 0; static_cast<int>(cf_meta.file_count) < kSlowdownTrigger * 10;
-       ++i) {
-    Put(1, ToString(i), std::string(10000, 'x'), WriteOptions());
-    db_->Flush(FlushOptions(), handles_[1]);
-    db_->GetColumnFamilyMetaData(handles_[1], &cf_meta);
-  }
-  ASSERT_GE(listener->slowdown_count, kSlowdownTrigger * 9);
-}
-
-}  // namespace rocksdb
-
-#endif  // ROCKSDB_LITE
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
-
@@ -0,0 +1,89 @@
+//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+
+
+#include <vector>
+
+#include "util/testharness.h"
+#include "util/benchharness.h"
+#include "db/version_set.h"
+#include "db/write_controller.h"
+#include "util/mutexlock.h"
+
+namespace rocksdb {
+
+std::string MakeKey(unsigned int num) {
+  char buf[30];
+  snprintf(buf, sizeof(buf), "%016u", num);
+  return std::string(buf);
+}
+
+void BM_LogAndApply(int iters, int num_base_files) {
+  VersionSet* vset;
+  WriteController wc;
+  ColumnFamilyData* default_cfd;
+  uint64_t fnum = 1;
+  port::Mutex mu;
+  MutexLock l(&mu);
+
+  BENCHMARK_SUSPEND {
+    std::string dbname = test::TmpDir() + "/rocksdb_test_benchmark";
+    ASSERT_OK(DestroyDB(dbname, Options()));
+
+    DB* db = nullptr;
+    Options opts;
+    opts.create_if_missing = true;
+    Status s = DB::Open(opts, dbname, &db);
+    ASSERT_OK(s);
+    ASSERT_TRUE(db != nullptr);
+
+    delete db;
+    db = nullptr;
+
+    Options options;
+    EnvOptions sopt;
+    // Notice we are using the default options not through SanitizeOptions().
+    // We might want to initialize some options manually if needed.
+    options.db_paths.emplace_back(dbname, 0);
+    // The parameter of table cache is passed in as null, so any file I/O
+    // operation is likely to fail.
+    vset = new VersionSet(dbname, &options, sopt, nullptr, &wc);
+    std::vector<ColumnFamilyDescriptor> dummy;
+    dummy.push_back(ColumnFamilyDescriptor());
+    ASSERT_OK(vset->Recover(dummy));
+    default_cfd = vset->GetColumnFamilySet()->GetDefault();
+    VersionEdit vbase;
+    for (int i = 0; i < num_base_files; i++) {
+      InternalKey start(MakeKey(2 * fnum), 1, kTypeValue);
+      InternalKey limit(MakeKey(2 * fnum + 1), 1, kTypeDeletion);
+      vbase.AddFile(2, ++fnum, 0, 1 /* file size */, start, limit, 1, 1);
+    }
+    ASSERT_OK(vset->LogAndApply(default_cfd,
+          *default_cfd->GetLatestMutableCFOptions(), &vbase, &mu));
+  }
+
+  for (int i = 0; i < iters; i++) {
+    VersionEdit vedit;
+    vedit.DeleteFile(2, fnum);
+    InternalKey start(MakeKey(2 * fnum), 1, kTypeValue);
+    InternalKey limit(MakeKey(2 * fnum + 1), 1, kTypeDeletion);
+    vedit.AddFile(2, ++fnum, 0, 1 /* file size */, start, limit, 1, 1);
+    vset->LogAndApply(default_cfd, *default_cfd->GetLatestMutableCFOptions(),
+                      &vedit, &mu);
+  }
+  delete vset;
+}
+
+BENCHMARK_NAMED_PARAM(BM_LogAndApply, 1000_iters_1_file, 1000, 1)
+BENCHMARK_NAMED_PARAM(BM_LogAndApply, 1000_iters_100_files, 1000, 100)
+BENCHMARK_NAMED_PARAM(BM_LogAndApply, 1000_iters_10000_files, 1000, 10000)
+BENCHMARK_NAMED_PARAM(BM_LogAndApply, 100_iters_100000_files, 100, 100000)
+
+}  // namespace rocksdb
+
+int main(int argc, char** argv) {
+  rocksdb::benchmark::RunBenchmarks();
+  return 0;
+}
@@ -13,7 +13,6 @@
 #include "rocksdb/env.h"
 #include "util/coding.h"
 #include "util/crc32c.h"
-#include "util/file_reader_writer.h"

 namespace rocksdb {
 namespace log {
@@ -21,7 +20,7 @@ namespace log {
 Reader::Reporter::~Reporter() {
 }

-Reader::Reader(unique_ptr<SequentialFileReader>&& _file, Reporter* reporter,
+Reader::Reader(unique_ptr<SequentialFile>&& _file, Reporter* reporter,
               bool checksum, uint64_t initial_offset)
    : file_(std::move(_file)),
      reporter_(reporter),
@@ -40,11 +39,12 @@ Reader::~Reader() {
 }

 bool Reader::SkipToInitialBlock() {
-  size_t initial_offset_in_block = initial_offset_ % kBlockSize;
-  uint64_t block_start_location = initial_offset_ - initial_offset_in_block;
+  size_t offset_in_block = initial_offset_ % kBlockSize;
+  uint64_t block_start_location = initial_offset_ - offset_in_block;

  // Don't search a block if we'd be in the trailer
-  if (initial_offset_in_block > kBlockSize - 6) {
+  if (offset_in_block > kBlockSize - 6) {
+    offset_in_block = 0;
    block_start_location += kBlockSize;
  }

@@ -54,7 +54,7 @@ bool Reader::SkipToInitialBlock() {
  if (block_start_location > 0) {
    Status skip_status = file_->Skip(block_start_location);
    if (!skip_status.ok()) {
-      ReportDrop(static_cast<size_t>(block_start_location), skip_status);
+      ReportDrop(block_start_location, skip_status);
      return false;
    }
  }
@@ -62,8 +62,7 @@ bool Reader::SkipToInitialBlock() {
  return true;
 }

-bool Reader::ReadRecord(Slice* record, std::string* scratch,
-                        const bool report_eof_inconsistency) {
+bool Reader::ReadRecord(Slice* record, std::string* scratch) {
  if (last_record_offset_ < initial_offset_) {
    if (!SkipToInitialBlock()) {
      return false;
@@ -80,16 +79,19 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
  Slice fragment;
  while (true) {
    uint64_t physical_record_offset = end_of_buffer_offset_ - buffer_.size();
-    const unsigned int record_type =
-        ReadPhysicalRecord(&fragment, report_eof_inconsistency);
+    const unsigned int record_type = ReadPhysicalRecord(&fragment);
    switch (record_type) {
      case kFullType:
-        if (in_fragmented_record && !scratch->empty()) {
+        if (in_fragmented_record) {
          // Handle bug in earlier versions of log::Writer where
          // it could emit an empty kFirstType record at the tail end
          // of a block followed by a kFullType or kFirstType record
          // at the beginning of the next block.
-          ReportCorruption(scratch->size(), "partial record without end(1)");
+          if (scratch->empty()) {
+            in_fragmented_record = false;
+          } else {
+            ReportCorruption(scratch->size(), "partial record without end(1)");
+          }
        }
        prospective_record_offset = physical_record_offset;
        scratch->clear();
@@ -98,12 +100,16 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
        return true;

      case kFirstType:
-        if (in_fragmented_record && !scratch->empty()) {
+        if (in_fragmented_record) {
          // Handle bug in earlier versions of log::Writer where
          // it could emit an empty kFirstType record at the tail end
          // of a block followed by a kFullType or kFirstType record
          // at the beginning of the next block.
-          ReportCorruption(scratch->size(), "partial record without end(2)");
+          if (scratch->empty()) {
+            in_fragmented_record = false;
+          } else {
+            ReportCorruption(scratch->size(), "partial record without end(2)");
+          }
        }
        prospective_record_offset = physical_record_offset;
        scratch->assign(fragment.data(), fragment.size());
@@ -133,9 +139,6 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,

      case kEof:
        if (in_fragmented_record) {
-          if (report_eof_inconsistency) {
-            ReportCorruption(scratch->size(), "error reading trailing data");
-          }
          // This can be caused by the writer dying immediately after
          //  writing a physical record but before completing the next; don't
          //  treat it as a corruption, just ignore the entire logical record.
@@ -244,8 +247,7 @@ void Reader::ReportDrop(size_t bytes, const Status& reason) {
  }
 }

-unsigned int Reader::ReadPhysicalRecord(Slice* result,
-                                        const bool report_eof_inconsistency) {
+unsigned int Reader::ReadPhysicalRecord(Slice* result) {
  while (true) {
    if (buffer_.size() < (size_t)kHeaderSize) {
      if (!eof_ && !read_error_) {
@@ -266,11 +268,8 @@ unsigned int Reader::ReadPhysicalRecord(Slice* result,
      } else {
        // Note that if buffer_ is non-empty, we have a truncated header at the
        //  end of the file, which can be caused by the writer crashing in the
-        //  middle of writing the header. Unless explicitly requested we don't
-        //  considering this an error, just report EOF.
-        if (buffer_.size() && report_eof_inconsistency) {
-          ReportCorruption(buffer_.size(), "truncated header");
-        }
+        //  middle of writing the header. Instead of considering this an error,
+        //  just report EOF.
        buffer_.clear();
        return kEof;
      }
@@ -291,10 +290,7 @@ unsigned int Reader::ReadPhysicalRecord(Slice* result,
      }
      // If the end of the file has been reached without reading |length| bytes
      // of payload, assume the writer died in the middle of writing the record.
-      // Don't report a corruption unless requested.
-      if (drop_size && report_eof_inconsistency) {
-        ReportCorruption(drop_size, "truncated header");
-      }
+      // Don't report a corruption.
      return kEof;
    }

@@ -17,17 +17,11 @@

 namespace rocksdb {

-class SequentialFileReader;
+class SequentialFile;
 using std::unique_ptr;

 namespace log {

-/**
- * Reader is a general purpose log stream reader implementation. The actual job
- * of reading from the device is implemented by the SequentialFile interface.
- *
- * Please see Writer for details on the file and record layout.
- */
 class Reader {
 public:
  // Interface for reporting errors.
@@ -51,7 +45,7 @@ class Reader {
  //
  // The Reader will start reading at the first record located at physical
  // position >= initial_offset within the file.
-  Reader(unique_ptr<SequentialFileReader>&& file, Reporter* reporter,
+  Reader(unique_ptr<SequentialFile>&& file, Reporter* reporter,
         bool checksum, uint64_t initial_offset);

  ~Reader();
@@ -61,8 +55,7 @@ class Reader {
  // "*scratch" as temporary storage.  The contents filled in *record
  // will only be valid until the next mutating operation on this
  // reader or the next mutation to *scratch.
-  bool ReadRecord(Slice* record, std::string* scratch,
-                  bool report_eof_inconsistency = false);
+  bool ReadRecord(Slice* record, std::string* scratch);

  // Returns the physical offset of the last record returned by ReadRecord.
  //
@@ -81,10 +74,10 @@ class Reader {
  // block that was partially read.
  void UnmarkEOF();

-  SequentialFileReader* file() { return file_.get(); }
+  SequentialFile* file() { return file_.get(); }

 private:
-  const unique_ptr<SequentialFileReader> file_;
+  const unique_ptr<SequentialFile> file_;
  Reporter* const reporter_;
  bool const checksum_;
  char* const backing_store_;
@@ -121,8 +114,7 @@ class Reader {
  bool SkipToInitialBlock();

  // Return type, or one of the preceding special values
-  unsigned int ReadPhysicalRecord(Slice* result,
-                                  bool report_eof_inconsistency = false);
+  unsigned int ReadPhysicalRecord(Slice* result);

  // Reports dropped bytes to the reporter.
  // buffer_ must be updated to remove the dropped bytes prior to invocation.
@@ -12,10 +12,8 @@
 #include "rocksdb/env.h"
 #include "util/coding.h"
 #include "util/crc32c.h"
-#include "util/file_reader_writer.h"
 #include "util/random.h"
 #include "util/testharness.h"
-#include "util/testutil.h"

 namespace rocksdb {
 namespace log {
@@ -43,8 +41,48 @@ static std::string RandomSkewedString(int i, Random* rnd) {
  return BigString(NumberString(i), rnd->Skewed(17));
 }

-class LogTest : public testing::Test {
+class LogTest {
 private:
+  class StringDest : public WritableFile {
+   public:
+    std::string contents_;
+
+    explicit StringDest(Slice& reader_contents) :
+      WritableFile(),
+      contents_(""),
+      reader_contents_(reader_contents),
+      last_flush_(0) {
+      reader_contents_ = Slice(contents_.data(), 0);
+    };
+
+    virtual Status Close() { return Status::OK(); }
+    virtual Status Flush() {
+      ASSERT_TRUE(reader_contents_.size() <= last_flush_);
+      size_t offset = last_flush_ - reader_contents_.size();
+      reader_contents_ = Slice(
+          contents_.data() + offset,
+          contents_.size() - offset);
+      last_flush_ = contents_.size();
+
+      return Status::OK();
+    }
+    virtual Status Sync() { return Status::OK(); }
+    virtual Status Append(const Slice& slice) {
+      contents_.append(slice.data(), slice.size());
+      return Status::OK();
+    }
+    void Drop(size_t bytes) {
+      contents_.resize(contents_.size() - bytes);
+      reader_contents_ = Slice(
+          reader_contents_.data(), reader_contents_.size() - bytes);
+      last_flush_ = contents_.size();
+    }
+
+   private:
+    Slice& reader_contents_;
+    size_t last_flush_;
+  };
+
  class StringSource : public SequentialFile {
   public:
    Slice& contents_;
@@ -61,8 +99,8 @@ class LogTest : public testing::Test {
      force_eof_position_(0),
      returned_partial_(false) { }

-    virtual Status Read(size_t n, Slice* result, char* scratch) override {
-      EXPECT_TRUE(!returned_partial_) << "must not Read() after eof/error";
+    virtual Status Read(size_t n, Slice* result, char* scratch) {
+      ASSERT_TRUE(!returned_partial_) << "must not Read() after eof/error";

      if (force_error_) {
        if (force_error_position_ >= n) {
@@ -100,7 +138,7 @@ class LogTest : public testing::Test {
      return Status::OK();
    }

-    virtual Status Skip(uint64_t n) override {
+    virtual Status Skip(uint64_t n) {
      if (n > contents_.size()) {
        contents_.clear();
        return Status::NotFound("in-memory file skipepd past end");
@@ -118,35 +156,33 @@ class LogTest : public testing::Test {
    std::string message_;

    ReportCollector() : dropped_bytes_(0) { }
-    virtual void Corruption(size_t bytes, const Status& status) override {
+    virtual void Corruption(size_t bytes, const Status& status) {
      dropped_bytes_ += bytes;
      message_.append(status.ToString());
    }
  };

  std::string& dest_contents() {
-    auto dest =
-      dynamic_cast<test::StringSink*>(writer_.file()->writable_file());
+    auto dest = dynamic_cast<StringDest*>(writer_.file());
    assert(dest);
    return dest->contents_;
  }

  const std::string& dest_contents() const {
-    auto dest =
-      dynamic_cast<const test::StringSink*>(writer_.file()->writable_file());
+    auto dest = dynamic_cast<const StringDest*>(writer_.file());
    assert(dest);
    return dest->contents_;
  }

  void reset_source_contents() {
-    auto src = dynamic_cast<StringSource*>(reader_.file()->file());
+    auto src = dynamic_cast<StringSource*>(reader_.file());
    assert(src);
    src->contents_ = dest_contents();
  }

  Slice reader_contents_;
-  unique_ptr<WritableFileWriter> dest_holder_;
-  unique_ptr<SequentialFileReader> source_holder_;
+  unique_ptr<StringDest> dest_holder_;
+  unique_ptr<StringSource> source_holder_;
  ReportCollector report_;
  Writer writer_;
  Reader reader_;
@@ -156,16 +192,13 @@ class LogTest : public testing::Test {
  static uint64_t initial_offset_last_record_offsets_[];

 public:
-  LogTest()
-      : reader_contents_(),
-        dest_holder_(
-            test::GetWritableFileWriter(
-              new test::StringSink(&reader_contents_))),
-        source_holder_(
-            test::GetSequentialFileReader(new StringSource(reader_contents_))),
-        writer_(std::move(dest_holder_)),
-        reader_(std::move(source_holder_), &report_, true /*checksum*/,
-                0 /*initial_offset*/) {}
+  LogTest() : reader_contents_(),
+              dest_holder_(new StringDest(reader_contents_)),
+              source_holder_(new StringSource(reader_contents_)),
+              writer_(std::move(dest_holder_)),
+              reader_(std::move(source_holder_), &report_, true/*checksum*/,
+                      0/*initial_offset*/) {
+  }

  void Write(const std::string& msg) {
    writer_.AddRecord(Slice(msg));
@@ -175,10 +208,10 @@ class LogTest : public testing::Test {
    return dest_contents().size();
  }

-  std::string Read(const bool report_eof_inconsistency = false) {
+  std::string Read() {
    std::string scratch;
    Slice record;
-    if (reader_.ReadRecord(&record, &scratch, report_eof_inconsistency)) {
+    if (reader_.ReadRecord(&record, &scratch)) {
      return record.ToString();
    } else {
      return "EOF";
@@ -194,8 +227,7 @@ class LogTest : public testing::Test {
  }

  void ShrinkSize(int bytes) {
-    auto dest =
-      dynamic_cast<test::StringSink*>(writer_.file()->writable_file());
+    auto dest = dynamic_cast<StringDest*>(writer_.file());
    assert(dest);
    dest->Drop(bytes);
  }
@@ -208,7 +240,7 @@ class LogTest : public testing::Test {
  }

  void ForceError(size_t position = 0) {
-    auto src = dynamic_cast<StringSource*>(reader_.file()->file());
+    auto src = dynamic_cast<StringSource*>(reader_.file());
    src->force_error_ = true;
    src->force_error_position_ = position;
  }
@@ -222,13 +254,13 @@ class LogTest : public testing::Test {
  }

  void ForceEOF(size_t position = 0) {
-    auto src = dynamic_cast<StringSource*>(reader_.file()->file());
+    auto src = dynamic_cast<StringSource*>(reader_.file());
    src->force_eof_ = true;
    src->force_eof_position_ = position;
  }

  void UnmarkEOF() {
-    auto src = dynamic_cast<StringSource*>(reader_.file()->file());
+    auto src = dynamic_cast<StringSource*>(reader_.file());
    src->returned_partial_ = false;
    reader_.UnmarkEOF();
  }
@@ -256,11 +288,10 @@ class LogTest : public testing::Test {

  void CheckOffsetPastEndReturnsNoRecords(uint64_t offset_past_end) {
    WriteInitialOffsetLog();
-    unique_ptr<SequentialFileReader> file_reader(
-        test::GetSequentialFileReader(new StringSource(reader_contents_)));
+    unique_ptr<StringSource> source(new StringSource(reader_contents_));
    unique_ptr<Reader> offset_reader(
-        new Reader(std::move(file_reader), &report_, true /*checksum*/,
-                   WrittenBytes() + offset_past_end));
+      new Reader(std::move(source), &report_, true/*checksum*/,
+                 WrittenBytes() + offset_past_end));
    Slice record;
    std::string scratch;
    ASSERT_TRUE(!offset_reader->ReadRecord(&record, &scratch));
@@ -269,10 +300,10 @@ class LogTest : public testing::Test {
  void CheckInitialOffsetRecord(uint64_t initial_offset,
                                int expected_record_offset) {
    WriteInitialOffsetLog();
-    unique_ptr<SequentialFileReader> file_reader(
-        test::GetSequentialFileReader(new StringSource(reader_contents_)));
-    unique_ptr<Reader> offset_reader(new Reader(
-        std::move(file_reader), &report_, true /*checksum*/, initial_offset));
+    unique_ptr<StringSource> source(new StringSource(reader_contents_));
+    unique_ptr<Reader> offset_reader(
+      new Reader(std::move(source), &report_, true/*checksum*/,
+                 initial_offset));
    Slice record;
    std::string scratch;
    ASSERT_TRUE(offset_reader->ReadRecord(&record, &scratch));
@@ -298,9 +329,12 @@ uint64_t LogTest::initial_offset_last_record_offsets_[] =
     2 * (kHeaderSize + 10000) +
         (2 * log::kBlockSize - 1000) + 3 * kHeaderSize};

-TEST_F(LogTest, Empty) { ASSERT_EQ("EOF", Read()); }

-TEST_F(LogTest, ReadWrite) {
+TEST(LogTest, Empty) {
+  ASSERT_EQ("EOF", Read());
+}
+
+TEST(LogTest, ReadWrite) {
  Write("foo");
  Write("bar");
  Write("");
@@ -313,7 +347,7 @@ TEST_F(LogTest, ReadWrite) {
  ASSERT_EQ("EOF", Read());  // Make sure reads at eof work
 }

-TEST_F(LogTest, ManyBlocks) {
+TEST(LogTest, ManyBlocks) {
  for (int i = 0; i < 100000; i++) {
    Write(NumberString(i));
  }
@@ -323,7 +357,7 @@ TEST_F(LogTest, ManyBlocks) {
  ASSERT_EQ("EOF", Read());
 }

-TEST_F(LogTest, Fragmentation) {
+TEST(LogTest, Fragmentation) {
  Write("small");
  Write(BigString("medium", 50000));
  Write(BigString("large", 100000));
@@ -333,7 +367,7 @@ TEST_F(LogTest, Fragmentation) {
  ASSERT_EQ("EOF", Read());
 }

-TEST_F(LogTest, MarginalTrailer) {
+TEST(LogTest, MarginalTrailer) {
  // Make a trailer that is exactly the same length as an empty record.
  const int n = kBlockSize - 2*kHeaderSize;
  Write(BigString("foo", n));
@@ -346,7 +380,7 @@ TEST_F(LogTest, MarginalTrailer) {
  ASSERT_EQ("EOF", Read());
 }

-TEST_F(LogTest, MarginalTrailer2) {
+TEST(LogTest, MarginalTrailer2) {
  // Make a trailer that is exactly the same length as an empty record.
  const int n = kBlockSize - 2*kHeaderSize;
  Write(BigString("foo", n));
@@ -359,7 +393,7 @@ TEST_F(LogTest, MarginalTrailer2) {
  ASSERT_EQ("", ReportMessage());
 }

-TEST_F(LogTest, ShortTrailer) {
+TEST(LogTest, ShortTrailer) {
  const int n = kBlockSize - 2*kHeaderSize + 4;
  Write(BigString("foo", n));
  ASSERT_EQ((unsigned int)(kBlockSize - kHeaderSize + 4), WrittenBytes());
@@ -371,7 +405,7 @@ TEST_F(LogTest, ShortTrailer) {
  ASSERT_EQ("EOF", Read());
 }

-TEST_F(LogTest, AlignedEof) {
+TEST(LogTest, AlignedEof) {
  const int n = kBlockSize - 2*kHeaderSize + 4;
  Write(BigString("foo", n));
  ASSERT_EQ((unsigned int)(kBlockSize - kHeaderSize + 4), WrittenBytes());
@@ -379,7 +413,7 @@ TEST_F(LogTest, AlignedEof) {
  ASSERT_EQ("EOF", Read());
 }

-TEST_F(LogTest, RandomRead) {
+TEST(LogTest, RandomRead) {
  const int N = 500;
  Random write_rnd(301);
  for (int i = 0; i < N; i++) {
@@ -394,7 +428,7 @@ TEST_F(LogTest, RandomRead) {

 // Tests of all the error paths in log_reader.cc follow:

-TEST_F(LogTest, ReadError) {
+TEST(LogTest, ReadError) {
  Write("foo");
  ForceError();
  ASSERT_EQ("EOF", Read());
@@ -402,7 +436,7 @@ TEST_F(LogTest, ReadError) {
  ASSERT_EQ("OK", MatchError("read error"));
 }

-TEST_F(LogTest, BadRecordType) {
+TEST(LogTest, BadRecordType) {
  Write("foo");
  // Type is stored in header[6]
  IncrementByte(6, 100);
@@ -412,7 +446,7 @@ TEST_F(LogTest, BadRecordType) {
  ASSERT_EQ("OK", MatchError("unknown record type"));
 }

-TEST_F(LogTest, TruncatedTrailingRecordIsIgnored) {
+TEST(LogTest, TruncatedTrailingRecordIsIgnored) {
  Write("foo");
  ShrinkSize(4);   // Drop all payload as well as a header byte
  ASSERT_EQ("EOF", Read());
@@ -421,16 +455,7 @@ TEST_F(LogTest, TruncatedTrailingRecordIsIgnored) {
  ASSERT_EQ("", ReportMessage());
 }

-TEST_F(LogTest, TruncatedTrailingRecordIsNotIgnored) {
-  Write("foo");
-  ShrinkSize(4);  // Drop all payload as well as a header byte
-  ASSERT_EQ("EOF", Read(/*report_eof_inconsistency*/ true));
-  // Truncated last record is ignored, not treated as an error
-  ASSERT_GT(DroppedBytes(), 0U);
-  ASSERT_EQ("OK", MatchError("Corruption: truncated header"));
-}
-
-TEST_F(LogTest, BadLength) {
+TEST(LogTest, BadLength) {
  const int kPayloadSize = kBlockSize - kHeaderSize;
  Write(BigString("bar", kPayloadSize));
  Write("foo");
@@ -441,7 +466,7 @@ TEST_F(LogTest, BadLength) {
  ASSERT_EQ("OK", MatchError("bad record length"));
 }

-TEST_F(LogTest, BadLengthAtEndIsIgnored) {
+TEST(LogTest, BadLengthAtEndIsIgnored) {
  Write("foo");
  ShrinkSize(1);
  ASSERT_EQ("EOF", Read());
@@ -449,15 +474,7 @@ TEST_F(LogTest, BadLengthAtEndIsIgnored) {
  ASSERT_EQ("", ReportMessage());
 }

-TEST_F(LogTest, BadLengthAtEndIsNotIgnored) {
-  Write("foo");
-  ShrinkSize(1);
-  ASSERT_EQ("EOF", Read(/*report_eof_inconsistency=*/true));
-  ASSERT_GT(DroppedBytes(), 0U);
-  ASSERT_EQ("OK", MatchError("Corruption: truncated header"));
-}
-
-TEST_F(LogTest, ChecksumMismatch) {
+TEST(LogTest, ChecksumMismatch) {
  Write("foo");
  IncrementByte(0, 10);
  ASSERT_EQ("EOF", Read());
@@ -465,7 +482,7 @@ TEST_F(LogTest, ChecksumMismatch) {
  ASSERT_EQ("OK", MatchError("checksum mismatch"));
 }

-TEST_F(LogTest, UnexpectedMiddleType) {
+TEST(LogTest, UnexpectedMiddleType) {
  Write("foo");
  SetByte(6, kMiddleType);
  FixChecksum(0, 3);
@@ -474,7 +491,7 @@ TEST_F(LogTest, UnexpectedMiddleType) {
  ASSERT_EQ("OK", MatchError("missing start"));
 }

-TEST_F(LogTest, UnexpectedLastType) {
+TEST(LogTest, UnexpectedLastType) {
  Write("foo");
  SetByte(6, kLastType);
  FixChecksum(0, 3);
@@ -483,7 +500,7 @@ TEST_F(LogTest, UnexpectedLastType) {
  ASSERT_EQ("OK", MatchError("missing start"));
 }

-TEST_F(LogTest, UnexpectedFullType) {
+TEST(LogTest, UnexpectedFullType) {
  Write("foo");
  Write("bar");
  SetByte(6, kFirstType);
@@ -494,7 +511,7 @@ TEST_F(LogTest, UnexpectedFullType) {
  ASSERT_EQ("OK", MatchError("partial record without end"));
 }

-TEST_F(LogTest, UnexpectedFirstType) {
+TEST(LogTest, UnexpectedFirstType) {
  Write("foo");
  Write(BigString("bar", 100000));
  SetByte(6, kFirstType);
@@ -505,7 +522,7 @@ TEST_F(LogTest, UnexpectedFirstType) {
  ASSERT_EQ("OK", MatchError("partial record without end"));
 }

-TEST_F(LogTest, MissingLastIsIgnored) {
+TEST(LogTest, MissingLastIsIgnored) {
  Write(BigString("bar", kBlockSize));
  // Remove the LAST block, including header.
  ShrinkSize(14);
@@ -514,16 +531,7 @@ TEST_F(LogTest, MissingLastIsIgnored) {
  ASSERT_EQ(0U, DroppedBytes());
 }

-TEST_F(LogTest, MissingLastIsNotIgnored) {
-  Write(BigString("bar", kBlockSize));
-  // Remove the LAST block, including header.
-  ShrinkSize(14);
-  ASSERT_EQ("EOF", Read(/*report_eof_inconsistency=*/true));
-  ASSERT_GT(DroppedBytes(), 0U);
-  ASSERT_EQ("OK", MatchError("Corruption: error reading trailing data"));
-}
-
-TEST_F(LogTest, PartialLastIsIgnored) {
+TEST(LogTest, PartialLastIsIgnored) {
  Write(BigString("bar", kBlockSize));
  // Cause a bad record length in the LAST block.
  ShrinkSize(1);
@@ -532,18 +540,7 @@ TEST_F(LogTest, PartialLastIsIgnored) {
  ASSERT_EQ(0U, DroppedBytes());
 }

-TEST_F(LogTest, PartialLastIsNotIgnored) {
-  Write(BigString("bar", kBlockSize));
-  // Cause a bad record length in the LAST block.
-  ShrinkSize(1);
-  ASSERT_EQ("EOF", Read(/*report_eof_inconsistency=*/true));
-  ASSERT_GT(DroppedBytes(), 0U);
-  ASSERT_EQ("OK", MatchError(
-                      "Corruption: truncated headerCorruption: "
-                      "error reading trailing data"));
-}
-
-TEST_F(LogTest, ErrorJoinsRecords) {
+TEST(LogTest, ErrorJoinsRecords) {
  // Consider two fragmented records:
  //    first(R1) last(R1) first(R2) last(R2)
  // where the middle two fragments disappear.  We do not want
@@ -561,48 +558,66 @@ TEST_F(LogTest, ErrorJoinsRecords) {

  ASSERT_EQ("correct", Read());
  ASSERT_EQ("EOF", Read());
-  size_t dropped = DroppedBytes();
-  ASSERT_LE(dropped, 2 * kBlockSize + 100);
-  ASSERT_GE(dropped, 2 * kBlockSize);
+  const unsigned int dropped = DroppedBytes();
+  ASSERT_LE(dropped, 2*kBlockSize + 100);
+  ASSERT_GE(dropped, 2*kBlockSize);
 }

-TEST_F(LogTest, ReadStart) { CheckInitialOffsetRecord(0, 0); }
+TEST(LogTest, ReadStart) {
+  CheckInitialOffsetRecord(0, 0);
+}

-TEST_F(LogTest, ReadSecondOneOff) { CheckInitialOffsetRecord(1, 1); }
+TEST(LogTest, ReadSecondOneOff) {
+  CheckInitialOffsetRecord(1, 1);
+}

-TEST_F(LogTest, ReadSecondTenThousand) { CheckInitialOffsetRecord(10000, 1); }
+TEST(LogTest, ReadSecondTenThousand) {
+  CheckInitialOffsetRecord(10000, 1);
+}

-TEST_F(LogTest, ReadSecondStart) { CheckInitialOffsetRecord(10007, 1); }
+TEST(LogTest, ReadSecondStart) {
+  CheckInitialOffsetRecord(10007, 1);
+}

-TEST_F(LogTest, ReadThirdOneOff) { CheckInitialOffsetRecord(10008, 2); }
+TEST(LogTest, ReadThirdOneOff) {
+  CheckInitialOffsetRecord(10008, 2);
+}

-TEST_F(LogTest, ReadThirdStart) { CheckInitialOffsetRecord(20014, 2); }
+TEST(LogTest, ReadThirdStart) {
+  CheckInitialOffsetRecord(20014, 2);
+}

-TEST_F(LogTest, ReadFourthOneOff) { CheckInitialOffsetRecord(20015, 3); }
+TEST(LogTest, ReadFourthOneOff) {
+  CheckInitialOffsetRecord(20015, 3);
+}

-TEST_F(LogTest, ReadFourthFirstBlockTrailer) {
+TEST(LogTest, ReadFourthFirstBlockTrailer) {
  CheckInitialOffsetRecord(log::kBlockSize - 4, 3);
 }

-TEST_F(LogTest, ReadFourthMiddleBlock) {
+TEST(LogTest, ReadFourthMiddleBlock) {
  CheckInitialOffsetRecord(log::kBlockSize + 1, 3);
 }

-TEST_F(LogTest, ReadFourthLastBlock) {
+TEST(LogTest, ReadFourthLastBlock) {
  CheckInitialOffsetRecord(2 * log::kBlockSize + 1, 3);
 }

-TEST_F(LogTest, ReadFourthStart) {
+TEST(LogTest, ReadFourthStart) {
  CheckInitialOffsetRecord(
      2 * (kHeaderSize + 1000) + (2 * log::kBlockSize - 1000) + 3 * kHeaderSize,
      3);
 }

-TEST_F(LogTest, ReadEnd) { CheckOffsetPastEndReturnsNoRecords(0); }
+TEST(LogTest, ReadEnd) {
+  CheckOffsetPastEndReturnsNoRecords(0);
+}

-TEST_F(LogTest, ReadPastEnd) { CheckOffsetPastEndReturnsNoRecords(5); }
+TEST(LogTest, ReadPastEnd) {
+  CheckOffsetPastEndReturnsNoRecords(5);
+}

-TEST_F(LogTest, ClearEofSingleBlock) {
+TEST(LogTest, ClearEofSingleBlock) {
  Write("foo");
  Write("bar");
  ForceEOF(3 + kHeaderSize + 2);
@@ -617,7 +632,7 @@ TEST_F(LogTest, ClearEofSingleBlock) {
  ASSERT_TRUE(IsEOF());
 }

-TEST_F(LogTest, ClearEofMultiBlock) {
+TEST(LogTest, ClearEofMultiBlock) {
  size_t num_full_blocks = 5;
  size_t n = (kBlockSize - kHeaderSize) * num_full_blocks + 25;
  Write(BigString("foo", n));
@@ -634,7 +649,7 @@ TEST_F(LogTest, ClearEofMultiBlock) {
  ASSERT_TRUE(IsEOF());
 }

-TEST_F(LogTest, ClearEofError) {
+TEST(LogTest, ClearEofError) {
  // If an error occurs during Read() in UnmarkEOF(), the records contained
  // in the buffer should be returned on subsequent calls of ReadRecord()
  // until no more full records are left, whereafter ReadRecord() should return
@@ -652,7 +667,7 @@ TEST_F(LogTest, ClearEofError) {
  ASSERT_EQ("EOF", Read());
 }

-TEST_F(LogTest, ClearEofError2) {
+TEST(LogTest, ClearEofError2) {
  Write("foo");
  Write("bar");
  UnmarkEOF();
@@ -670,6 +685,5 @@ TEST_F(LogTest, ClearEofError2) {
 }  // namespace rocksdb

 int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+  return rocksdb::test::RunAllTests();
 }
@@ -13,13 +13,13 @@
 #include "rocksdb/env.h"
 #include "util/coding.h"
 #include "util/crc32c.h"
-#include "util/file_reader_writer.h"

 namespace rocksdb {
 namespace log {

-Writer::Writer(unique_ptr<WritableFileWriter>&& dest)
-    : dest_(std::move(dest)), block_offset_(0) {
+Writer::Writer(unique_ptr<WritableFile>&& dest)
+    : dest_(std::move(dest)),
+      block_offset_(0) {
  for (int i = 0; i <= kMaxRecordType; i++) {
    char t = static_cast<char>(i);
    type_crc_[i] = crc32c::Value(&t, 1);
@@ -52,7 +52,7 @@ Status Writer::AddRecord(const Slice& slice) {
    }

    // Invariant: we never leave < kHeaderSize bytes in a block.
-    assert(static_cast<int>(kBlockSize) - block_offset_ >= kHeaderSize);
+    assert(kBlockSize - block_offset_ - kHeaderSize >= 0);

    const size_t avail = kBlockSize - block_offset_ - kHeaderSize;
    const size_t fragment_length = (left < avail) ? left : avail;
@@ -16,61 +16,27 @@

 namespace rocksdb {

-class WritableFileWriter;
+class WritableFile;

 using std::unique_ptr;

 namespace log {

-/**
- * Writer is a general purpose log stream writer. It provides an append-only
- * abstraction for writing data. The details of the how the data is written is
- * handled by the WriteableFile sub-class implementation.
- *
- * File format:
- *
- * File is broken down into variable sized records. The format of each record
- * is described below.
- *       +-----+-------------+--+----+----------+------+-- ... ----+
- * File  | r0  |        r1   |P | r2 |    r3    |  r4  |           |
- *       +-----+-------------+--+----+----------+------+-- ... ----+
- *       <--- kBlockSize ------>|<-- kBlockSize ------>|
- *  rn = variable size records
- *  P = Padding
- *
- * Data is written out in kBlockSize chunks. If next record does not fit
- * into the space left, the leftover space will be padded with \0.
- *
- * Record format:
- *
- * +---------+-----------+-----------+--- ... ---+
- * |CRC (4B) | Size (2B) | Type (1B) | Payload   |
- * +---------+-----------+-----------+--- ... ---+
- *
- * CRC = 32bit hash computed over the payload using CRC
- * Size = Length of the payload data
- * Type = Type of record
- *        (kZeroType, kFullType, kFirstType, kLastType, kMiddleType )
- *        The type is used to group a bunch of records together to represent
- *        blocks that are larger than kBlockSize
- * Payload = Byte stream as long as specified by the payload size
- *
- */
 class Writer {
 public:
  // Create a writer that will append data to "*dest".
  // "*dest" must be initially empty.
  // "*dest" must remain live while this Writer is in use.
-  explicit Writer(unique_ptr<WritableFileWriter>&& dest);
+  explicit Writer(unique_ptr<WritableFile>&& dest);
  ~Writer();

  Status AddRecord(const Slice& slice);

-  WritableFileWriter* file() { return dest_.get(); }
-  const WritableFileWriter* file() const { return dest_.get(); }
+  WritableFile* file() { return dest_.get(); }
+  const WritableFile* file() const { return dest_.get(); }

 private:
-  unique_ptr<WritableFileWriter> dest_;
+  unique_ptr<WritableFile> dest_;
  int block_offset_;       // Current offset in block

  // crc32c values for all supported record types.  These are
@@ -1,257 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-
-#ifndef ROCKSDB_LITE
-
-#include <limits>
-#include <string>
-#include <utility>
-
-#include "db/column_family.h"
-#include "db/db_impl.h"
-#include "db/db_iter.h"
-#include "db/dbformat.h"
-#include "db/managed_iterator.h"
-#include "rocksdb/env.h"
-#include "rocksdb/slice.h"
-#include "rocksdb/slice_transform.h"
-#include "table/merger.h"
-#include "util/xfunc.h"
-
-namespace rocksdb {
-
-namespace {
-// Helper class that locks a mutex on construction and unlocks the mutex when
-// the destructor of the MutexLock object is invoked.
-//
-// Typical usage:
-//
-//   void MyClass::MyMethod() {
-//     MILock l(&mu_);       // mu_ is an instance variable
-//     ... some complex code, possibly with multiple return paths ...
-//   }
-
-class MILock {
- public:
-  explicit MILock(std::mutex* mu, ManagedIterator* mi) : mu_(mu), mi_(mi) {
-    this->mu_->lock();
-  }
-  ~MILock() {
-    this->mu_->unlock();
-    XFUNC_TEST("managed_xftest_release", "managed_unlock", managed_unlock1,
-               xf_manage_release, mi_);
-  }
-  ManagedIterator* GetManagedIterator() { return mi_; }
-
- private:
-  std::mutex* const mu_;
-  ManagedIterator* mi_;
-  // No copying allowed
-  MILock(const MILock&) = delete;
-  void operator=(const MILock&) = delete;
-};
-}  // anonymous namespace
-
-//
-// Synchronization between modifiers, releasers, creators
-// If iterator operation, wait till (!in_use), set in_use, do op, reset in_use
-//  if modifying mutable_iter, atomically exchange in_use:
-//  return if in_use set / otherwise set in use,
-//  atomically replace new iter with old , reset in use
-//  The releaser is the new operation and it holds a lock for a very short time
-//  The existing non-const iterator operations are supposed to be single
-//  threaded and hold the lock for the duration of the operation
-//  The existing const iterator operations use the cached key/values
-//  and don't do any locking.
-ManagedIterator::ManagedIterator(DBImpl* db, const ReadOptions& read_options,
-                                 ColumnFamilyData* cfd)
-    : db_(db),
-      read_options_(read_options),
-      cfd_(cfd),
-      svnum_(cfd->GetSuperVersionNumber()),
-      mutable_iter_(nullptr),
-      valid_(false),
-      snapshot_created_(false),
-      release_supported_(true) {
-  read_options_.managed = false;
-  if ((!read_options_.tailing) && (read_options_.snapshot == nullptr)) {
-    assert(read_options_.snapshot = db_->GetSnapshot());
-    snapshot_created_ = true;
-  }
-  cfh_.SetCFD(cfd);
-  mutable_iter_ = unique_ptr<Iterator>(db->NewIterator(read_options_, &cfh_));
-  XFUNC_TEST("managed_xftest_dropold", "managed_create", xf_managed_create1,
-             xf_manage_create, this);
-}
-
-ManagedIterator::~ManagedIterator() {
-  Lock();
-  if (snapshot_created_) {
-    db_->ReleaseSnapshot(read_options_.snapshot);
-    snapshot_created_ = false;
-    read_options_.snapshot = nullptr;
-  }
-  UnLock();
-}
-
-bool ManagedIterator::Valid() const { return valid_; }
-
-void ManagedIterator::SeekToLast() {
-  MILock l(&in_use_, this);
-  if (NeedToRebuild()) {
-    RebuildIterator();
-  }
-  assert(mutable_iter_ != nullptr);
-  mutable_iter_->SeekToLast();
-  if (mutable_iter_->status().ok()) {
-    UpdateCurrent();
-  }
-}
-
-void ManagedIterator::SeekToFirst() {
-  MILock l(&in_use_, this);
-  SeekInternal(Slice(), true);
-}
-
-void ManagedIterator::Seek(const Slice& user_key) {
-  MILock l(&in_use_, this);
-  SeekInternal(user_key, false);
-}
-
-void ManagedIterator::SeekInternal(const Slice& user_key, bool seek_to_first) {
-  if (NeedToRebuild()) {
-    RebuildIterator();
-  }
-  assert(mutable_iter_ != nullptr);
-  if (seek_to_first) {
-    mutable_iter_->SeekToFirst();
-  } else {
-    mutable_iter_->Seek(user_key);
-  }
-  UpdateCurrent();
-}
-
-void ManagedIterator::Prev() {
-  if (!valid_) {
-    status_ = Status::InvalidArgument("Iterator value invalid");
-    return;
-  }
-  MILock l(&in_use_, this);
-  if (NeedToRebuild()) {
-    std::string current_key = key().ToString();
-    Slice old_key(current_key);
-    RebuildIterator();
-    SeekInternal(old_key, false);
-    UpdateCurrent();
-    if (!valid_) {
-      return;
-    }
-    if (key().compare(old_key) != 0) {
-      valid_ = false;
-      status_ = Status::Incomplete("Cannot do Prev now");
-      return;
-    }
-  }
-  mutable_iter_->Prev();
-  if (mutable_iter_->status().ok()) {
-    UpdateCurrent();
-    status_ = Status::OK();
-  } else {
-    status_ = mutable_iter_->status();
-  }
-}
-
-void ManagedIterator::Next() {
-  if (!valid_) {
-    status_ = Status::InvalidArgument("Iterator value invalid");
-    return;
-  }
-  MILock l(&in_use_, this);
-  if (NeedToRebuild()) {
-    std::string current_key = key().ToString();
-    Slice old_key(current_key.data(), cached_key_.Size());
-    RebuildIterator();
-    SeekInternal(old_key, false);
-    UpdateCurrent();
-    if (!valid_) {
-      return;
-    }
-    if (key().compare(old_key) != 0) {
-      valid_ = false;
-      status_ = Status::Incomplete("Cannot do Next now");
-      return;
-    }
-  }
-  mutable_iter_->Next();
-  UpdateCurrent();
-}
-
-Slice ManagedIterator::key() const {
-  assert(valid_);
-  return cached_key_.GetKey();
-}
-
-Slice ManagedIterator::value() const {
-  assert(valid_);
-  return cached_value_.GetKey();
-}
-
-Status ManagedIterator::status() const { return status_; }
-
-void ManagedIterator::RebuildIterator() {
-  svnum_ = cfd_->GetSuperVersionNumber();
-  mutable_iter_ = unique_ptr<Iterator>(db_->NewIterator(read_options_, &cfh_));
-}
-
-void ManagedIterator::UpdateCurrent() {
-  assert(mutable_iter_ != nullptr);
-
-  if (!(valid_ = mutable_iter_->Valid())) {
-    status_ = mutable_iter_->status();
-    return;
-  }
-
-  status_ = Status::OK();
-  cached_key_.SetKey(mutable_iter_->key());
-  cached_value_.SetKey(mutable_iter_->value());
-}
-
-void ManagedIterator::ReleaseIter(bool only_old) {
-  if ((mutable_iter_ == nullptr) || (!release_supported_)) {
-    return;
-  }
-  if (svnum_ != cfd_->GetSuperVersionNumber() || !only_old) {
-    if (!TryLock()) {  // Don't release iter if in use
-      return;
-    }
-    mutable_iter_ = nullptr;  // in_use for a very short time
-    UnLock();
-  }
-}
-
-bool ManagedIterator::NeedToRebuild() {
-  if ((mutable_iter_ == nullptr) || (status_.IsIncomplete()) ||
-      (!only_drop_old_ && (svnum_ != cfd_->GetSuperVersionNumber()))) {
-    return true;
-  }
-  return false;
-}
-
-void ManagedIterator::Lock() {
-  in_use_.lock();
-  return;
-}
-
-bool ManagedIterator::TryLock() { return in_use_.try_lock(); }
-
-void ManagedIterator::UnLock() {
-  in_use_.unlock();
-  XFUNC_TEST("managed_xftest_release", "managed_unlock", managed_unlock1,
-             xf_manage_release, this);
-}
-
-}  // namespace rocksdb
-
-#endif  // ROCKSDB_LITE
@@ -1,84 +0,0 @@
-//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-#pragma once
-
-#ifndef ROCKSDB_LITE
-
-#include <mutex>
-#include <queue>
-#include <string>
-#include <vector>
-
-#include "db/column_family.h"
-#include "rocksdb/db.h"
-#include "rocksdb/iterator.h"
-#include "rocksdb/options.h"
-#include "util/arena.h"
-
-namespace rocksdb {
-
-class DBImpl;
-struct SuperVersion;
-class ColumnFamilyData;
-
-/**
- * ManagedIterator is a special type of iterator that supports freeing the
- * underlying iterator and still being able to access the current key/value
- * pair.  This is done by copying the key/value pair so that clients can
- * continue to access the data without getting a SIGSEGV.
- * The underlying iterator can be freed manually through the  call to
- * ReleaseIter or automatically (as needed on space pressure or age.)
- * The iterator is recreated using the saved original arguments.
- */
-class ManagedIterator : public Iterator {
- public:
-  ManagedIterator(DBImpl* db, const ReadOptions& read_options,
-                  ColumnFamilyData* cfd);
-  virtual ~ManagedIterator();
-
-  virtual void SeekToLast() override;
-  virtual void Prev() override;
-  virtual bool Valid() const override;
-  void SeekToFirst() override;
-  virtual void Seek(const Slice& target) override;
-  virtual void Next() override;
-  virtual Slice key() const override;
-  virtual Slice value() const override;
-  virtual Status status() const override;
-  void ReleaseIter(bool only_old);
-  void SetDropOld(bool only_old) {
-    only_drop_old_ = read_options_.tailing || only_old;
-  }
-
- private:
-  void RebuildIterator();
-  void UpdateCurrent();
-  void SeekInternal(const Slice& user_key, bool seek_to_first);
-  bool NeedToRebuild();
-  void Lock();
-  bool TryLock();
-  void UnLock();
-  DBImpl* const db_;
-  ReadOptions read_options_;
-  ColumnFamilyData* const cfd_;
-  ColumnFamilyHandleInternal cfh_;
-
-  uint64_t svnum_;
-  std::unique_ptr<Iterator> mutable_iter_;
-  // internal iterator status
-  Status status_;
-  bool valid_;
-
-  IterKey cached_key_;
-  IterKey cached_value_;
-
-  bool only_drop_old_ = true;
-  bool snapshot_created_;
-  bool release_supported_;
-  std::mutex in_use_;  // is managed iterator in use
-};
-
-}  // namespace rocksdb
-#endif  // !ROCKSDB_LITE
@@ -15,7 +15,6 @@

 #include "db/dbformat.h"
 #include "db/merge_context.h"
-#include "db/writebuffer.h"
 #include "rocksdb/comparator.h"
 #include "rocksdb/env.h"
 #include "rocksdb/iterator.h"
@@ -53,39 +52,31 @@ MemTableOptions::MemTableOptions(

 MemTable::MemTable(const InternalKeyComparator& cmp,
                   const ImmutableCFOptions& ioptions,
-                   const MutableCFOptions& mutable_cf_options,
-                   WriteBuffer* write_buffer, SequenceNumber earliest_seq)
+                   const MutableCFOptions& mutable_cf_options)
    : comparator_(cmp),
      moptions_(ioptions, mutable_cf_options),
      refs_(0),
      kArenaBlockSize(OptimizeBlockSize(moptions_.arena_block_size)),
      arena_(moptions_.arena_block_size),
-      allocator_(&arena_, write_buffer),
      table_(ioptions.memtable_factory->CreateMemTableRep(
-          comparator_, &allocator_, ioptions.prefix_extractor,
-          ioptions.info_log)),
-      data_size_(0),
+          comparator_, &arena_, ioptions.prefix_extractor, ioptions.info_log)),
      num_entries_(0),
-      num_deletes_(0),
      flush_in_progress_(false),
      flush_completed_(false),
      file_number_(0),
      first_seqno_(0),
-      earliest_seqno_(earliest_seq),
      mem_next_logfile_number_(0),
-      locks_(moptions_.inplace_update_support
-                 ? moptions_.inplace_update_num_locks
-                 : 0),
+      locks_(moptions_.inplace_update_support ?
+             moptions_.inplace_update_num_locks : 0),
      prefix_extractor_(ioptions.prefix_extractor),
      should_flush_(ShouldFlushNow()),
-      flush_scheduled_(false),
-      env_(ioptions.env) {
+      flush_scheduled_(false) {
  // if should_flush_ == true without an entry inserted, something must have
  // gone wrong already.
  assert(!should_flush_);
  if (prefix_extractor_ && moptions_.memtable_prefix_bloom_bits > 0) {
    prefix_bloom_.reset(new DynamicBloom(
-        &allocator_,
+        &arena_,
        moptions_.memtable_prefix_bloom_bits, ioptions.bloom_locality,
        moptions_.memtable_prefix_bloom_probes, nullptr,
        moptions_.memtable_prefix_bloom_huge_page_tlb_size,
@@ -188,7 +179,7 @@ Slice MemTableRep::UserKey(const char* key) const {
 }

 KeyHandle MemTableRep::Allocate(const size_t len, char** buf) {
-  *buf = allocator_->Allocate(len);
+  *buf = arena_->Allocate(len);
  return static_cast<KeyHandle>(*buf);
 }

@@ -197,7 +188,7 @@ KeyHandle MemTableRep::Allocate(const size_t len, char** buf) {
 // into this scratch space.
 const char* EncodeKey(std::string* scratch, const Slice& target) {
  scratch->clear();
-  PutVarint32(scratch, static_cast<uint32_t>(target.size()));
+  PutVarint32(scratch, target.size());
  scratch->append(target.data(), target.size());
  return scratch->data();
 }
@@ -226,10 +217,8 @@ class MemTableIterator: public Iterator {
    }
  }

-  virtual bool Valid() const override { return valid_; }
-  virtual void Seek(const Slice& k) override {
-    PERF_TIMER_GUARD(seek_on_memtable_time);
-    PERF_COUNTER_ADD(seek_on_memtable_count, 1);
+  virtual bool Valid() const { return valid_; }
+  virtual void Seek(const Slice& k) {
    if (bloom_ != nullptr &&
        !bloom_->MayContain(prefix_extractor_->Transform(ExtractUserKey(k)))) {
      valid_ = false;
@@ -238,35 +227,35 @@ class MemTableIterator: public Iterator {
    iter_->Seek(k, nullptr);
    valid_ = iter_->Valid();
  }
-  virtual void SeekToFirst() override {
+  virtual void SeekToFirst() {
    iter_->SeekToFirst();
    valid_ = iter_->Valid();
  }
-  virtual void SeekToLast() override {
+  virtual void SeekToLast() {
    iter_->SeekToLast();
    valid_ = iter_->Valid();
  }
-  virtual void Next() override {
+  virtual void Next() {
    assert(Valid());
    iter_->Next();
    valid_ = iter_->Valid();
  }
-  virtual void Prev() override {
+  virtual void Prev() {
    assert(Valid());
    iter_->Prev();
    valid_ = iter_->Valid();
  }
-  virtual Slice key() const override {
+  virtual Slice key() const {
    assert(Valid());
    return GetLengthPrefixedSlice(iter_->key());
  }
-  virtual Slice value() const override {
+  virtual Slice value() const {
    assert(Valid());
    Slice key_slice = GetLengthPrefixedSlice(iter_->key());
    return GetLengthPrefixedSlice(key_slice.data() + key_slice.size());
  }

-  virtual Status status() const override { return Status::OK(); }
+  virtual Status status() const { return Status::OK(); }

 private:
  DynamicBloom* bloom_;
@@ -291,26 +280,6 @@ port::RWMutex* MemTable::GetLock(const Slice& key) {
  return &locks_[hash(key) % locks_.size()];
 }

-uint64_t MemTable::ApproximateSize(const Slice& start_ikey,
-                                   const Slice& end_ikey) {
-  uint64_t entry_count = table_->ApproximateNumEntries(start_ikey, end_ikey);
-  if (entry_count == 0) {
-    return 0;
-  }
-  uint64_t n = num_entries_.load(std::memory_order_relaxed);
-  if (n == 0) {
-    return 0;
-  }
-  if (entry_count > n) {
-    // table_->ApproximateNumEntries() is just an estimate so it can be larger
-    // than actual entries we have. Cap it to entries we have to limit the
-    // inaccuracy.
-    entry_count = n;
-  }
-  uint64_t data_size = data_size_.load(std::memory_order_relaxed);
-  return entry_count * (data_size / n);
-}
-
 void MemTable::Add(SequenceNumber s, ValueType type,
                   const Slice& key, /* user key */
                   const Slice& value) {
@@ -319,32 +288,25 @@ void MemTable::Add(SequenceNumber s, ValueType type,
  //  key bytes    : char[internal_key.size()]
  //  value_size   : varint32 of value.size()
  //  value bytes  : char[value.size()]
-  uint32_t key_size = static_cast<uint32_t>(key.size());
-  uint32_t val_size = static_cast<uint32_t>(value.size());
-  uint32_t internal_key_size = key_size + 8;
-  const uint32_t encoded_len = VarintLength(internal_key_size) +
-                               internal_key_size + VarintLength(val_size) +
-                               val_size;
+  size_t key_size = key.size();
+  size_t val_size = value.size();
+  size_t internal_key_size = key_size + 8;
+  const size_t encoded_len =
+      VarintLength(internal_key_size) + internal_key_size +
+      VarintLength(val_size) + val_size;
  char* buf = nullptr;
  KeyHandle handle = table_->Allocate(encoded_len, &buf);
  assert(buf != nullptr);
  char* p = EncodeVarint32(buf, internal_key_size);
  memcpy(p, key.data(), key_size);
  p += key_size;
-  uint64_t packed = PackSequenceAndType(s, type);
-  EncodeFixed64(p, packed);
+  EncodeFixed64(p, (s << 8) | type);
  p += 8;
  p = EncodeVarint32(p, val_size);
  memcpy(p, value.data(), val_size);
  assert((unsigned)(p + val_size - buf) == (unsigned)encoded_len);
  table_->Insert(handle);
-  num_entries_.store(num_entries_.load(std::memory_order_relaxed) + 1,
-                     std::memory_order_relaxed);
-  data_size_.store(data_size_.load(std::memory_order_relaxed) + encoded_len,
-                   std::memory_order_relaxed);
-  if (type == kTypeDeletion) {
-    num_deletes_++;
-  }
+  num_entries_++;

  if (prefix_bloom_) {
    assert(prefix_extractor_);
@@ -355,11 +317,6 @@ void MemTable::Add(SequenceNumber s, ValueType type,
  assert(first_seqno_ == 0 || s > first_seqno_);
  if (first_seqno_ == 0) {
    first_seqno_ = s;
-
-    if (earliest_seqno_ == kMaxSequenceNumber) {
-      earliest_seqno_ = first_seqno_;
-    }
-    assert(first_seqno_ >= earliest_seqno_);
  }

  should_flush_ = ShouldFlushNow();
@@ -374,7 +331,6 @@ struct Saver {
  bool* found_final_value;  // Is value set correctly? Used by KeyMayExist
  bool* merge_in_progress;
  std::string* value;
-  SequenceNumber seq;
  const MergeOperator* merge_operator;
  // the merge operations encountered;
  MergeContext* merge_context;
@@ -382,7 +338,6 @@ struct Saver {
  Logger* logger;
  Statistics* statistics;
  bool inplace_update_support;
-  Env* env_;
 };
 }  // namespace

@@ -408,10 +363,7 @@ static bool SaveValue(void* arg, const char* entry) {
          Slice(key_ptr, key_length - 8), s->key->user_key()) == 0) {
    // Correct user key
    const uint64_t tag = DecodeFixed64(key_ptr + key_length - 8);
-    ValueType type;
-    UnPackSequenceAndType(tag, &s->seq, &type);
-
-    switch (type) {
+    switch (static_cast<ValueType>(tag & 0xff)) {
      case kTypeValue: {
        if (s->inplace_update_support) {
          s->mem->GetLock(s->key->user_key())->ReadLock();
@@ -420,17 +372,9 @@ static bool SaveValue(void* arg, const char* entry) {
        *(s->status) = Status::OK();
        if (*(s->merge_in_progress)) {
          assert(merge_operator);
-          bool merge_success = false;
-          {
-            StopWatchNano timer(s->env_, s->statistics != nullptr);
-            PERF_TIMER_GUARD(merge_operator_time_nanos);
-            merge_success = merge_operator->FullMerge(
-                s->key->user_key(), &v, merge_context->GetOperands(), s->value,
-                s->logger);
-            RecordTick(s->statistics, MERGE_OPERATION_TOTAL_TIME,
-                       timer.ElapsedNanos());
-          }
-          if (!merge_success) {
+          if (!merge_operator->FullMerge(s->key->user_key(), &v,
+                                         merge_context->GetOperands(), s->value,
+                                         s->logger)) {
            RecordTick(s->statistics, NUMBER_MERGE_FAILURES);
            *(s->status) =
                Status::Corruption("Error: Could not perform merge.");
@@ -448,17 +392,9 @@ static bool SaveValue(void* arg, const char* entry) {
        if (*(s->merge_in_progress)) {
          assert(merge_operator);
          *(s->status) = Status::OK();
-          bool merge_success = false;
-          {
-            StopWatchNano timer(s->env_, s->statistics != nullptr);
-            PERF_TIMER_GUARD(merge_operator_time_nanos);
-            merge_success = merge_operator->FullMerge(
-                s->key->user_key(), nullptr, merge_context->GetOperands(),
-                s->value, s->logger);
-            RecordTick(s->statistics, MERGE_OPERATION_TOTAL_TIME,
-                       timer.ElapsedNanos());
-          }
-          if (!merge_success) {
+          if (!merge_operator->FullMerge(s->key->user_key(), nullptr,
+                                         merge_context->GetOperands(), s->value,
+                                         s->logger)) {
            RecordTick(s->statistics, NUMBER_MERGE_FAILURES);
            *(s->status) =
                Status::Corruption("Error: Could not perform merge.");
@@ -496,7 +432,7 @@ static bool SaveValue(void* arg, const char* entry) {
 }

 bool MemTable::Get(const LookupKey& key, std::string* value, Status* s,
-                   MergeContext* merge_context, SequenceNumber* seq) {
+                   MergeContext* merge_context) {
  // The sequence number is updated synchronously in version_set.h
  if (IsEmpty()) {
    // Avoiding recording stats for speed.
@@ -511,7 +447,6 @@ bool MemTable::Get(const LookupKey& key, std::string* value, Status* s,
  if (prefix_bloom_ &&
      !prefix_bloom_->MayContain(prefix_extractor_->Transform(user_key))) {
    // iter is null if prefix bloom says the key does not exist
-    *seq = kMaxSequenceNumber;
  } else {
    Saver saver;
    saver.status = s;
@@ -519,17 +454,14 @@ bool MemTable::Get(const LookupKey& key, std::string* value, Status* s,
    saver.merge_in_progress = &merge_in_progress;
    saver.key = &key;
    saver.value = value;
-    saver.seq = kMaxSequenceNumber;
+    saver.status = s;
    saver.mem = this;
    saver.merge_context = merge_context;
    saver.merge_operator = moptions_.merge_operator;
    saver.logger = moptions_.info_log;
    saver.inplace_update_support = moptions_.inplace_update_support;
    saver.statistics = moptions_.statistics;
-    saver.env_ = env_;
    table_->Get(key, &saver, SaveValue);
-
-    *seq = saver.seq;
  }

  // No change to value, since we have not yet found a Put/Delete
@@ -567,14 +499,11 @@ void MemTable::Update(SequenceNumber seq,
        Slice(key_ptr, key_length - 8), lkey.user_key()) == 0) {
      // Correct user key
      const uint64_t tag = DecodeFixed64(key_ptr + key_length - 8);
-      ValueType type;
-      SequenceNumber unused;
-      UnPackSequenceAndType(tag, &unused, &type);
-      switch (type) {
+      switch (static_cast<ValueType>(tag & 0xff)) {
        case kTypeValue: {
          Slice prev_value = GetLengthPrefixedSlice(key_ptr + key_length);
-          uint32_t prev_size = static_cast<uint32_t>(prev_value.size());
-          uint32_t new_size = static_cast<uint32_t>(value.size());
+          uint32_t prev_size = prev_value.size();
+          uint32_t new_size = value.size();

          // Update value, if new value size  <= previous value size
          if (new_size <= prev_size ) {
@@ -628,16 +557,13 @@ bool MemTable::UpdateCallback(SequenceNumber seq,
        Slice(key_ptr, key_length - 8), lkey.user_key()) == 0) {
      // Correct user key
      const uint64_t tag = DecodeFixed64(key_ptr + key_length - 8);
-      ValueType type;
-      uint64_t unused;
-      UnPackSequenceAndType(tag, &unused, &type);
-      switch (type) {
+      switch (static_cast<ValueType>(tag & 0xff)) {
        case kTypeValue: {
          Slice prev_value = GetLengthPrefixedSlice(key_ptr + key_length);
-          uint32_t prev_size = static_cast<uint32_t>(prev_value.size());
+          uint32_t  prev_size = prev_value.size();

          char* prev_buffer = const_cast<char*>(prev_value.data());
-          uint32_t new_prev_size = prev_size;
+          uint32_t  new_prev_size = prev_size;

          std::string str_value;
          WriteLock wl(GetLock(lkey.user_key()));
@@ -701,10 +627,7 @@ size_t MemTable::CountSuccessiveMergeEntries(const LookupKey& key) {
    }

    const uint64_t tag = DecodeFixed64(iter_key_ptr + key_length - 8);
-    ValueType type;
-    uint64_t unused;
-    UnPackSequenceAndType(tag, &unused, &type);
-    if (type != kTypeMerge) {
+    if (static_cast<ValueType>(tag & 0xff) != kTypeMerge) {
      break;
    }

@@ -17,20 +17,18 @@
 #include "db/skiplist.h"
 #include "db/version_edit.h"
 #include "rocksdb/db.h"
-#include "rocksdb/env.h"
 #include "rocksdb/memtablerep.h"
 #include "rocksdb/immutable_options.h"
-#include "db/memtable_allocator.h"
 #include "util/arena.h"
 #include "util/dynamic_bloom.h"
 #include "util/mutable_cf_options.h"

 namespace rocksdb {

+class Arena;
 class Mutex;
 class MemTableIterator;
 class MergeContext;
-class WriteBuffer;

 struct MemTableOptions {
  explicit MemTableOptions(
@@ -54,56 +52,30 @@ struct MemTableOptions {
  Logger* info_log;
 };

-// Note:  Many of the methods in this class have comments indicating that
-// external synchromization is required as these methods are not thread-safe.
-// It is up to higher layers of code to decide how to prevent concurrent
-// invokation of these methods.  This is usually done by acquiring either
-// the db mutex or the single writer thread.
-//
-// Some of these methods are documented to only require external
-// synchronization if this memtable is immutable.  Calling MarkImmutable() is
-// not sufficient to guarantee immutability.  It is up to higher layers of
-// code to determine if this MemTable can still be modified by other threads.
-// Eg: The Superversion stores a pointer to the current MemTable (that can
-// be modified) and a separate list of the MemTables that can no longer be
-// written to (aka the 'immutable memtables').
 class MemTable {
 public:
  struct KeyComparator : public MemTableRep::KeyComparator {
    const InternalKeyComparator comparator;
    explicit KeyComparator(const InternalKeyComparator& c) : comparator(c) { }
    virtual int operator()(const char* prefix_len_key1,
-                           const char* prefix_len_key2) const override;
+                           const char* prefix_len_key2) const;
    virtual int operator()(const char* prefix_len_key,
                           const Slice& key) const override;
  };

  // MemTables are reference counted.  The initial reference count
  // is zero and the caller must call Ref() at least once.
-  //
-  // earliest_seq should be the current SequenceNumber in the db such that any
-  // key inserted into this memtable will have an equal or larger seq number.
-  // (When a db is first created, the earliest sequence number will be 0).
-  // If the earliest sequence number is not known, kMaxSequenceNumber may be
-  // used, but this may prevent some transactions from succeeding until the
-  // first key is inserted into the memtable.
  explicit MemTable(const InternalKeyComparator& comparator,
                    const ImmutableCFOptions& ioptions,
-                    const MutableCFOptions& mutable_cf_options,
-                    WriteBuffer* write_buffer, SequenceNumber earliest_seq);
+                    const MutableCFOptions& mutable_cf_options);

-  // Do not delete this MemTable unless Unref() indicates it not in use.
  ~MemTable();

  // Increase reference count.
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
  void Ref() { ++refs_; }

  // Drop reference count.
-  // If the refcount goes to zero return this memtable, otherwise return null.
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
+  // If the refcount goes to zero return this memtable, otherwise return null
  MemTable* Unref() {
    --refs_;
    assert(refs_ >= 0);
@@ -117,7 +89,7 @@ class MemTable {
  // data structure.
  //
  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable (unless this Memtable is immutable).
+  // operations on the same MemTable.
  size_t ApproximateMemoryUsage();

  // This method heuristically determines if the memtable should continue to
@@ -145,9 +117,6 @@ class MemTable {
  // Add an entry into memtable that maps key to value at the
  // specified sequence number and with the specified type.
  // Typically value will be empty if type==kTypeDeletion.
-  //
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
  void Add(SequenceNumber seq, ValueType type,
           const Slice& key,
           const Slice& value);
@@ -160,19 +129,8 @@ class MemTable {
  //   prepend the current merge operand to *operands.
  //   store MergeInProgress in s, and return false.
  // Else, return false.
-  // If any operation was found, its most recent sequence number
-  // will be stored in *seq on success (regardless of whether true/false is
-  // returned).  Otherwise, *seq will be set to kMaxSequenceNumber.
-  // On success, *s may be set to OK, NotFound, or MergeInProgress.  Any other
-  // status returned indicates a corruption or other unexpected error.
  bool Get(const LookupKey& key, std::string* value, Status* s,
-           MergeContext* merge_context, SequenceNumber* seq);
-
-  bool Get(const LookupKey& key, std::string* value, Status* s,
-           MergeContext* merge_context) {
-    SequenceNumber seq;
-    return Get(key, value, s, merge_context, &seq);
-  }
+           MergeContext* merge_context);

  // Attempts to update the new_value inplace, else does normal Add
  // Pseudocode
@@ -181,9 +139,6 @@ class MemTable {
  //       update inplace
  //     else add(key, new_value)
  //   else add(key, new_value)
-  //
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
  void Update(SequenceNumber seq,
              const Slice& key,
              const Slice& value);
@@ -197,9 +152,6 @@ class MemTable {
  //       update inplace
  //     else add(key, new_value)
  //   else return false
-  //
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
  bool UpdateCallback(SequenceNumber seq,
                      const Slice& key,
                      const Slice& delta);
@@ -210,61 +162,28 @@ class MemTable {
  size_t CountSuccessiveMergeEntries(const LookupKey& key);

  // Get total number of entries in the mem table.
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable (unless this Memtable is immutable).
-  uint64_t num_entries() const {
-    return num_entries_.load(std::memory_order_relaxed);
-  }
-
-  // Get total number of deletes in the mem table.
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable (unless this Memtable is immutable).
-  uint64_t num_deletes() const { return num_deletes_; }
+  uint64_t GetNumEntries() const { return num_entries_; }

  // Returns the edits area that is needed for flushing the memtable
  VersionEdit* GetEdits() { return &edit_; }

  // Returns if there is no entry inserted to the mem table.
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable (unless this Memtable is immutable).
  bool IsEmpty() const { return first_seqno_ == 0; }

  // Returns the sequence number of the first element that was inserted
-  // into the memtable.
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable (unless this Memtable is immutable).
+  // into the memtable
  SequenceNumber GetFirstSequenceNumber() { return first_seqno_; }

-  // Returns the sequence number that is guaranteed to be smaller than or equal
-  // to the sequence number of any key that could be inserted into this
-  // memtable. It can then be assumed that any write with a larger(or equal)
-  // sequence number will be present in this memtable or a later memtable.
-  //
-  // If the earliest sequence number could not be determined,
-  // kMaxSequenceNumber will be returned.
-  SequenceNumber GetEarliestSequenceNumber() { return earliest_seqno_; }
-
  // Returns the next active logfile number when this memtable is about to
  // be flushed to storage
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
  uint64_t GetNextLogNumber() { return mem_next_logfile_number_; }

  // Sets the next active logfile number when this memtable is about to
  // be flushed to storage
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
  void SetNextLogNumber(uint64_t num) { mem_next_logfile_number_ = num; }

-  // Notify the underlying storage that no more items will be added.
-  // REQUIRES: external synchronization to prevent simultaneous
-  // operations on the same MemTable.
-  // After MarkImmutable() is called, you should not attempt to
-  // write anything to this MemTable().  (Ie. do not call Add() or Update()).
-  void MarkImmutable() {
-    table_->MarkReadOnly();
-    allocator_.DoneAllocating();
-  }
+  // Notify the underlying storage that no more items will be added
+  void MarkImmutable() { table_->MarkReadOnly(); }

  // return true if the current MemTableRep supports merge operator.
  bool IsMergeOperatorSupported() const {
@@ -272,12 +191,7 @@ class MemTable {
  }

  // return true if the current MemTableRep supports snapshots.
-  // inplace update prevents snapshots,
-  bool IsSnapshotSupported() const {
-    return table_->IsSnapshotSupported() && !moptions_.inplace_update_support;
-  }
-
-  uint64_t ApproximateSize(const Slice& start_ikey, const Slice& end_ikey);
+  bool IsSnapshotSupported() const { return table_->IsSnapshotSupported(); }

  // Get the lock associated for the key
  port::RWMutex* GetLock(const Slice& key);
@@ -286,6 +200,8 @@ class MemTable {
    return comparator_.comparator;
  }

+  const Arena& TEST_GetArena() const { return arena_; }
+
  const MemTableOptions* GetMemTableOptions() const { return &moptions_; }

 private:
@@ -301,13 +217,9 @@ class MemTable {
  int refs_;
  const size_t kArenaBlockSize;
  Arena arena_;
-  MemTableAllocator allocator_;
  unique_ptr<MemTableRep> table_;

-  // Total data size of all data inserted
-  std::atomic<uint64_t> data_size_;
-  std::atomic<uint64_t> num_entries_;
-  uint64_t num_deletes_;
+  uint64_t num_entries_;

  // These are used to manage memtable flushes to storage
  bool flush_in_progress_; // started the flush
@@ -321,10 +233,6 @@ class MemTable {
  // The sequence number of the kv that was inserted first
  SequenceNumber first_seqno_;

-  // The db sequence number at the time of creation or kMaxSequenceNumber
-  // if not set.
-  SequenceNumber earliest_seqno_;
-
  // The log files earlier than this number can be deleted.
  uint64_t mem_next_logfile_number_;

@@ -343,7 +251,6 @@ class MemTable {

  // a flag indicating if flush has been scheduled
  bool flush_scheduled_;
-  Env* env_;
 };

 extern const char* EncodeKey(std::string* scratch, const Slice& target);
@@ -1,52 +0,0 @@
-//  Copyright (c) 2014, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#include <assert.h>
-
-#include "db/memtable_allocator.h"
-#include "db/writebuffer.h"
-#include "util/arena.h"
-
-namespace rocksdb {
-
-MemTableAllocator::MemTableAllocator(Arena* arena, WriteBuffer* write_buffer)
-    : arena_(arena), write_buffer_(write_buffer), bytes_allocated_(0) {
-}
-
-MemTableAllocator::~MemTableAllocator() {
-  DoneAllocating();
-}
-
-char* MemTableAllocator::Allocate(size_t bytes) {
-  assert(write_buffer_ != nullptr);
-  bytes_allocated_ += bytes;
-  write_buffer_->ReserveMem(bytes);
-  return arena_->Allocate(bytes);
-}
-
-char* MemTableAllocator::AllocateAligned(size_t bytes, size_t huge_page_size,
-                                         Logger* logger) {
-  assert(write_buffer_ != nullptr);
-  bytes_allocated_ += bytes;
-  write_buffer_->ReserveMem(bytes);
-  return arena_->AllocateAligned(bytes, huge_page_size, logger);
-}
-
-void MemTableAllocator::DoneAllocating() {
-  if (write_buffer_ != nullptr) {
-    write_buffer_->FreeMem(bytes_allocated_);
-    write_buffer_ = nullptr;
-  }
-}
-
-size_t MemTableAllocator::BlockSize() const {
-  return arena_->BlockSize();
-}
-
-}  // namespace rocksdb
@@ -1,47 +0,0 @@
-//  Copyright (c) 2014, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under the BSD-style license found in the
-//  LICENSE file in the root directory of this source tree. An additional grant
-//  of patent rights can be found in the PATENTS file in the same directory.
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-//
-// This is used by the MemTable to allocate write buffer memory. It connects
-// to WriteBuffer so we can track and enforce overall write buffer limits.
-
-#pragma once
-#include "util/allocator.h"
-
-namespace rocksdb {
-
-class Arena;
-class Logger;
-class WriteBuffer;
-
-class MemTableAllocator : public Allocator {
- public:
-  explicit MemTableAllocator(Arena* arena, WriteBuffer* write_buffer);
-  ~MemTableAllocator();
-
-  // Allocator interface
-  char* Allocate(size_t bytes) override;
-  char* AllocateAligned(size_t bytes, size_t huge_page_size = 0,
-                        Logger* logger = nullptr) override;
-  size_t BlockSize() const override;
-
-  // Call when we're finished allocating memory so we can free it from
-  // the write buffer's limit.
-  void DoneAllocating();
-
- private:
-  Arena* arena_;
-  WriteBuffer* write_buffer_;
-  size_t bytes_allocated_;
-
-  // No copying allowed
-  MemTableAllocator(const MemTableAllocator&);
-  void operator=(const MemTableAllocator&);
-};
-
-}  // namespace rocksdb
Author	SHA1	Message	Date
sdong	22c7a01c2c	One more include<functional>	2019-10-31 14:53:20 -07:00
sdong	f0db718ac7	Disable warning as error	2019-10-31 14:53:04 -07:00
sdong	495253ca73	Add some include<functional>	2019-10-31 14:52:49 -07:00
sdong	cc34f73a08	[FB Internal] Point to the latest tool chain.	2019-10-31 14:52:49 -07:00
sdong	7affe40309	[FB Only] use gcc-5	2017-07-17 21:07:44 -07:00