HISTORY.md update for bzip upgrade (#6767 )

Summary: See https://github.com/facebook/rocksdb/issues/6714 and https://github.com/facebook/rocksdb/issues/6703 Pull Request resolved: https://github.com/facebook/rocksdb/pull/6767 Reviewed By: riversand963 Differential Revision: D21283307 Pulled By: pdillinger fbshipit-source-id: 8463bec725669d13846c728ad4b5bde43f9a84f8
Update RocksJava static version of bzip2 (#6714 )
2026-11-06 11:02:36 -05:00 · 2020-04-28 13:50:06 -07:00 · 2020-04-16 16:01:15 -07:00 · 2020-04-16 16:01:08 -07:00 · 2020-04-15 10:05:11 -07:00 · 2020-04-15 10:04:56 -07:00
965 changed files with 20030 additions and 11396 deletions
@@ -52,6 +52,8 @@ trace_analyzer
 trace_analyzer_test
 block_cache_trace_analyzer
 .DS_Store
+.vs
+.vscode

 java/out
 java/target
@@ -81,7 +81,9 @@ install:
      sudo apt-get install -y mingw-w64 ;
    fi
  - if [[ "${JOB_NAME}" == cmake* ]] && [ "${TRAVIS_OS_NAME}" == linux ]; then
-      mkdir cmake-dist && curl -sfSL https://github.com/Kitware/CMake/releases/download/v3.14.5/cmake-3.14.5-Linux-x86_64.tar.gz | tar --strip-components=1 -C cmake-dist -xz && export PATH=$PWD/cmake-dist/bin:$PATH;
+      CMAKE_DIST_URL="https://rocksdb-deps.s3-us-west-2.amazonaws.com/cmake/cmake-3.14.5-Linux-$(uname -m).tar.bz2";
+      TAR_OPT="--strip-components=1 -xj";
+      mkdir cmake-dist && curl --silent --fail --show-error --location "${CMAKE_DIST_URL}" | tar -C cmake-dist ${TAR_OPT} && export PATH=$PWD/cmake-dist/bin:$PATH;
    fi
  - if [[ "${JOB_NAME}" == java_test ]]; then
      java -version && echo "JAVA_HOME=${JAVA_HOME}";
@@ -103,7 +105,7 @@ script:
      OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=db_block_cache_test ROCKSDBTESTS_END=db_iter_test make -j4 check_some
      ;;
    2)
-      OPT=-DTRAVIS V=1 make -j4 tools && OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=db_iter_test ROCKSDBTESTS_END=options_file_test make -j4 check_some
+      OPT="-DTRAVIS -DROCKSDB_NAMESPACE=alternative_rocksdb_ns" V=1 make -j4 tools && OPT="-DTRAVIS -DROCKSDB_NAMESPACE=alternative_rocksdb_ns" V=1 ROCKSDBTESTS_START=db_iter_test ROCKSDBTESTS_END=options_file_test make -j4 check_some
      ;;
    3)
      OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=options_file_test ROCKSDBTESTS_END=write_prepared_transaction_test make -j4 check_some
@@ -665,6 +665,7 @@ set(SOURCES
        util/random.cc
        util/rate_limiter.cc
        util/slice.cc
+        util/file_checksum_helper.cc
        util/status.cc
        util/string_util.cc
        util/thread_local.cc
@@ -906,15 +907,15 @@ if(NOT WIN32 OR ROCKSDB_INSTALL_ON_WINDOWS)
  )
 endif()

-add_subdirectory(third-party/gtest-1.8.1/fused-src/gtest)
-add_library(testharness STATIC
-  test_util/testharness.cc)
-target_link_libraries(testharness gtest)
-
 # Tests are excluded from Release builds
 CMAKE_DEPENDENT_OPTION(WITH_TESTS "build with tests" ON
  "CMAKE_BUILD_TYPE STREQUAL Debug" OFF)
 if(WITH_TESTS)
+  add_subdirectory(third-party/gtest-1.8.1/fused-src/gtest)
+  add_library(testharness STATIC
+  test_util/testharness.cc)
+  target_link_libraries(testharness gtest)
+
  set(TESTS
        cache/cache_test.cc
        cache/lru_cache_test.cc
@@ -1025,6 +1026,7 @@ if(WITH_TESTS)
        util/bloom_test.cc
        util/coding_test.cc
        util/crc32c_test.cc
+        util/defer_test.cc
        util/dynamic_bloom_test.cc
        util/file_reader_writer_test.cc
        util/filelock_test.cc
@@ -1033,6 +1035,7 @@ if(WITH_TESTS)
        util/random_test.cc
        util/rate_limiter_test.cc
        util/repeatable_thread_test.cc
+        util/slice_test.cc
        util/slice_transform_test.cc
        util/timer_queue_test.cc
        util/thread_list_test.cc
@@ -1166,9 +1169,15 @@ if(WITH_BENCHMARK_TOOLS)
    ${ROCKSDB_LIB})
 endif()

+option(WITH_CORE_TOOLS "build with ldb and sst_dump" ON)
 option(WITH_TOOLS "build with tools" ON)
-if(WITH_TOOLS)
+if(WITH_CORE_TOOLS OR WITH_TOOLS)
  add_subdirectory(tools)
+  add_custom_target(core_tools
+    DEPENDS ${core_tool_deps})
+endif()
+
+if(WITH_TOOLS)
  add_subdirectory(db_stress_tool)
  add_custom_target(tools
    DEPENDS ${tool_deps})
@@ -1,5 +1,40 @@
 # Rocksdb Change Log
 ## Unreleased
+### Bug Fixes
+* Upgraded version of bzip library (1.0.6 -> 1.0.8) used with RocksJava to address potential vulnerabilities if an attacker can manipulate compressed data saved and loaded by RocksDB (not normal). See issue #6703.
+
+## 6.8.1 (03/30/2020)
+### Behavior changes
+* Since RocksDB 6.8.0, ttl-based FIFO compaction can drop a file whose oldest key becomes older than options.ttl while others have not. This fix reverts this and makes ttl-based FIFO compaction use the file's flush time as the criterion. This fix also requires that max_open_files = -1 and compaction_options_fifo.allow_compaction = false to function properly.
+
+## 6.8.0 (02/24/2020)
+### Java API Changes
+* Major breaking changes to Java comparators, toward standardizing on ByteBuffer for performant, locale-neutral operations on keys (#6252).
+* Added overloads of common API methods using direct ByteBuffers for keys and values (#2283).
+
+### Bug Fixes
+* Fix incorrect results while block-based table uses kHashSearch, together with Prev()/SeekForPrev().
+* Fix a bug that prevents opening a DB after two consecutive crash with TransactionDB, where the first crash recovers from a corrupted WAL with kPointInTimeRecovery but the second cannot.
+* Fixed issue #6316 that can cause a corruption of the MANIFEST file in the middle when writing to it fails due to no disk space.
+* Add DBOptions::skip_checking_sst_file_sizes_on_db_open. It disables potentially expensive checking of all sst file sizes in DB::Open().
+* BlobDB now ignores trivially moved files when updating the mapping between blob files and SSTs. This should mitigate issue #6338 where out of order flush/compaction notifications could trigger an assertion with the earlier code.
+* Batched MultiGet() ignores IO errors while reading data blocks, causing it to potentially continue looking for a key and returning stale results.
+* `WriteBatchWithIndex::DeleteRange` returns `Status::NotSupported`. Previously it returned success even though reads on the batch did not account for range tombstones. The corresponding language bindings now cannot be used. In C, that includes `rocksdb_writebatch_wi_delete_range`, `rocksdb_writebatch_wi_delete_range_cf`, `rocksdb_writebatch_wi_delete_rangev`, and `rocksdb_writebatch_wi_delete_rangev_cf`. In Java, that includes `WriteBatchWithIndex::deleteRange`.
+* Assign new MANIFEST file number when caller tries to create a new MANIFEST by calling LogAndApply(..., new_descriptor_log=true). This bug can cause MANIFEST being overwritten during recovery if options.write_dbid_to_manifest = true and there are WAL file(s).
+
+### Performance Improvements
+* Perfom readahead when reading from option files. Inside DB, options.log_readahead_size will be used as the readahead size. In other cases, a default 512KB is used.
+
+### Public API Change
+* The BlobDB garbage collector now emits the statistics `BLOB_DB_GC_NUM_FILES` (number of blob files obsoleted during GC), `BLOB_DB_GC_NUM_NEW_FILES` (number of new blob files generated during GC), `BLOB_DB_GC_FAILURES` (number of failed GC passes), `BLOB_DB_GC_NUM_KEYS_RELOCATED` (number of blobs relocated during GC), and `BLOB_DB_GC_BYTES_RELOCATED` (total size of blobs relocated during GC). On the other hand, the following statistics, which are not relevant for the new GC implementation, are now deprecated: `BLOB_DB_GC_NUM_KEYS_OVERWRITTEN`, `BLOB_DB_GC_NUM_KEYS_EXPIRED`, `BLOB_DB_GC_BYTES_OVERWRITTEN`, `BLOB_DB_GC_BYTES_EXPIRED`, and `BLOB_DB_GC_MICROS`.
+* Disable recycle_log_file_num when an inconsistent recovery modes are requested: kPointInTimeRecovery and kAbsoluteConsistency
+
+### New Features
+* Added the checksum for each SST file generated by Flush or Compaction. Added sst_file_checksum_func to Options such that user can plugin their own SST file checksum function via override the FileChecksumFunc class. If user does not set the sst_file_checksum_func, SST file checksum calculation will not be enabled. The checksum information inlcuding uint32_t checksum value and a checksum function name (string). The checksum information is stored in FileMetadata in version store and also logged to MANIFEST. A new tool is added to LDB such that user can dump out a list of file checksum information from MANIFEST (stored in an unordered_map).
+* `db_bench` now supports `value_size_distribution_type`, `value_size_min`, `value_size_max` options for generating random variable sized value. Added `blob_db_compression_type` option for BlobDB to enable blob compression.
+* Replace RocksDB namespace "rocksdb" with flag "ROCKSDB_NAMESPACE" which if is not defined, defined as "rocksdb" in header file rocksdb_namespace.h.
+
+## 6.7.0 (01/21/2020)
 ### Public API Change
 * Added a rocksdb::FileSystem class in include/rocksdb/file_system.h to encapsulate file creation/read/write operations, and an option DBOptions::file_system to allow a user to pass in an instance of rocksdb::FileSystem. If its a non-null value, this will take precendence over DBOptions::env for file operations. A new API rocksdb::FileSystem::Default() returns a platform default object. The DBOptions::env option and Env::Default() API will continue to be used for threading and other OS related functions, and where DBOptions::file_system is not specified, for file operations. For storage developers who are accustomed to rocksdb::Env, the interface in rocksdb::FileSystem is new and will probably undergo some changes as more storage systems are ported to it from rocksdb::Env. As of now, no env other than Posix has been ported to the new interface.
 * A new rocksdb::NewSstFileManager() API that allows the caller to pass in separate Env and FileSystem objects.
@@ -8,18 +43,35 @@

 ### Bug Fixes
 * Fix a bug that can cause unnecessary bg thread to be scheduled(#6104).
-* Fix a bug in which a snapshot read could be affected by a DeleteRange after the snapshot (#6062).
 * Fix crash caused by concurrent CF iterations and drops(#6147).
-* Fixed two performance issues related to memtable history trimming. First, a new SuperVersion is now created only if some memtables were actually trimmed. Second, trimming is only scheduled if there is at least one flushed memtable that is kept in memory for the purposes of transaction conflict checking.
-* Fix a bug in WriteBatchWithIndex::MultiGetFromBatchAndDB, which is called by Transaction::MultiGet, that causes due to stale pointer access when the number of keys is > 32
-* BlobDB no longer updates the SST to blob file mapping upon failed compactions.
-* Fixed a bug where BlobDB was comparing the `ColumnFamilyHandle` pointers themselves instead of only the column family IDs when checking whether an API call uses the default column family or not.
 * Fix a race condition for cfd->log_number_ between manifest switch and memtable switch (PR 6249) when number of column families is greater than 1.
+* Fix a bug on fractional cascading index when multiple files at the same level contain the same smallest user key, and those user keys are for merge operands. In this case, Get() the exact key may miss some merge operands.
+* Delcare kHashSearch index type feature-incompatible with index_block_restart_interval larger than 1.
+* Fixed an issue where the thread pools were not resized upon setting `max_background_jobs` dynamically through the `SetDBOptions` interface.
+* Fix a bug that can cause write threads to hang when a slowdown/stall happens and there is a mix of writers with WriteOptions::no_slowdown set/unset.
+* Fixed an issue where an incorrect "number of input records" value was used to compute the "records dropped" statistics for compactions.
+* Fix a regression bug that causes segfault when hash is used, max_open_files != -1 and total order seek is used and switched back.

 ### New Features
 * It is now possible to enable periodic compactions for the base DB when using BlobDB.
 * BlobDB now garbage collects non-TTL blobs when `enable_garbage_collection` is set to `true` in `BlobDBOptions`. Garbage collection is performed during compaction: any valid blobs located in the oldest N files (where N is the number of non-TTL blob files multiplied by the value of `BlobDBOptions::garbage_collection_cutoff`) encountered during compaction get relocated to new blob files, and old blob files are dropped once they are no longer needed. Note: we recommend enabling periodic compactions for the base DB when using this feature to deal with the case when some old blob files are kept alive by SSTs that otherwise do not get picked for compaction.
 * `db_bench` now supports the `garbage_collection_cutoff` option for BlobDB.
+* Introduce ReadOptions.auto_prefix_mode. When set to true, iterator will return the same result as total order seek, but may choose to use prefix seek internally based on seek key and iterator upper bound.
+* MultiGet() can use IO Uring to parallelize read from the same SST file. This featuer is by default disabled. It can be enabled with environment variable ROCKSDB_USE_IO_URING.
+
+## 6.6.2 (01/13/2020)
+### Bug Fixes
+* Fixed a bug where non-L0 compaction input files were not considered to compute the `creation_time` of new compaction outputs.
+
+## 6.6.1 (01/02/2020)
+### Bug Fixes
+* Fix a bug in WriteBatchWithIndex::MultiGetFromBatchAndDB, which is called by Transaction::MultiGet, that causes due to stale pointer access when the number of keys is > 32
+* Fixed two performance issues related to memtable history trimming. First, a new SuperVersion is now created only if some memtables were actually trimmed. Second, trimming is only scheduled if there is at least one flushed memtable that is kept in memory for the purposes of transaction conflict checking.
+* BlobDB no longer updates the SST to blob file mapping upon failed compactions.
+* Fix a bug in which a snapshot read through an iterator could be affected by a DeleteRange after the snapshot (#6062).
+* Fixed a bug where BlobDB was comparing the `ColumnFamilyHandle` pointers themselves instead of only the column family IDs when checking whether an API call uses the default column family or not.
+* Delete superversions in BackgroundCallPurge.
+* Fix use-after-free and double-deleting files in BackgroundCallPurge().

 ## 6.6.0 (11/25/2019)
 ### Bug Fixes
@@ -503,6 +503,7 @@ TESTS = \
 	data_block_hash_index_test \
 	cache_test \
 	corruption_test \
+	slice_test \
 	slice_transform_test \
 	dbformat_test \
 	fault_injection_test \
@@ -595,6 +596,7 @@ TESTS = \
 	db_secondary_test \
 	block_cache_tracer_test \
 	block_cache_trace_analyzer_test \
+	defer_test \

 ifeq ($(USE_FOLLY_DISTRIBUTED_MUTEX),1)
 	TESTS += folly_synchronization_distributed_mutex_test
@@ -1128,16 +1130,21 @@ unity_test: db/db_test.o db/db_test_util.o $(TESTHARNESS) $(TOOLLIBOBJECTS) unit
 rocksdb.h rocksdb.cc: build_tools/amalgamate.py Makefile $(LIB_SOURCES) unity.cc
 	build_tools/amalgamate.py -I. -i./include unity.cc -x include/rocksdb/c.h -H rocksdb.h -o rocksdb.cc

-clean: clean-ext-libraries-all clean-rocks
+clean: clean-ext-libraries-all clean-rocks clean-rocksjava

-clean-not-downloaded: clean-ext-libraries-bin clean-rocks
+clean-not-downloaded: clean-ext-libraries-bin clean-rocks clean-not-downloaded-rocksjava

 clean-rocks:
 	rm -f $(BENCHMARKS) $(TOOLS) $(TESTS) $(PARALLEL_TEST) $(LIBRARY) $(SHARED)
 	rm -rf $(CLEAN_FILES) ios-x86 ios-arm scan_build_report
 	$(FIND) . -name "*.[oda]" -exec rm -f {} \;
 	$(FIND) . -type f -regex ".*\.\(\(gcda\)\|\(gcno\)\)" -exec rm {} \;
-	cd java; $(MAKE) clean
+
+clean-rocksjava:
+	cd java && $(MAKE) clean
+
+clean-not-downloaded-rocksjava:
+	cd java && $(MAKE) clean-not-downloaded

 clean-ext-libraries-all:
 	rm -rf bzip2* snappy* zlib* lz4* zstd*
@@ -1286,6 +1293,9 @@ corruption_test: db/corruption_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARN
 crc32c_test: util/crc32c_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

+slice_test: util/slice_test.o $(LIBOBJECTS) $(TESTHARNESS)
+	$(AM_LINK)
+
 slice_transform_test: util/slice_transform_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

@@ -1705,6 +1715,9 @@ block_cache_tracer_test: trace_replay/block_cache_tracer_test.o trace_replay/blo
 block_cache_trace_analyzer_test: tools/block_cache_analyzer/block_cache_trace_analyzer_test.o tools/block_cache_analyzer/block_cache_trace_analyzer.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

+defer_test: util/defer_test.o $(LIBOBJECTS) $(TESTHARNESS)
+	$(AM_LINK)
+
 #-------------------------------------------------
 # make install related stuff
 INSTALL_PATH ?= /usr/local
@@ -1784,11 +1797,11 @@ SHA256_CMD = sha256sum
 ZLIB_VER ?= 1.2.11
 ZLIB_SHA256 ?= c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
 ZLIB_DOWNLOAD_BASE ?= http://zlib.net
-BZIP2_VER ?= 1.0.6
-BZIP2_SHA256 ?= a2848f34fcd5d6cf47def00461fcb528a0484d8edef8208d6d2e2909dc61d9cd
-BZIP2_DOWNLOAD_BASE ?= https://downloads.sourceforge.net/project/bzip2
-SNAPPY_VER ?= 1.1.7
-SNAPPY_SHA256 ?= 3dfa02e873ff51a11ee02b9ca391807f0c8ea0529a4924afa645fbf97163f9d4
+BZIP2_VER ?= 1.0.8
+BZIP2_SHA256 ?= ab5a03176ee106d3f0fa90e381da478ddae405918153cca248e682cd0c4a2269
+BZIP2_DOWNLOAD_BASE ?= https://sourceware.org/pub/bzip2
+SNAPPY_VER ?= 1.1.8
+SNAPPY_SHA256 ?= 16b677f07832a612b0836178db7f374e414f94657c138e6993cbfc5dcc58651f
 SNAPPY_DOWNLOAD_BASE ?= https://github.com/google/snappy/archive
 LZ4_VER ?= 1.9.2
 LZ4_SHA256 ?= 658ba6191fa44c92280d4aa2c271b0f4fbc0e34d249578dd05e50e76d0e5efcc
@@ -1834,7 +1847,7 @@ endif
 libz.a:
 	-rm -rf zlib-$(ZLIB_VER)
 ifeq (,$(wildcard ./zlib-$(ZLIB_VER).tar.gz))
-	curl --output zlib-$(ZLIB_VER).tar.gz -L ${ZLIB_DOWNLOAD_BASE}/zlib-$(ZLIB_VER).tar.gz
+	curl --fail --output zlib-$(ZLIB_VER).tar.gz --location ${ZLIB_DOWNLOAD_BASE}/zlib-$(ZLIB_VER).tar.gz
 endif
 	ZLIB_SHA256_ACTUAL=`$(SHA256_CMD) zlib-$(ZLIB_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(ZLIB_SHA256)" != "$$ZLIB_SHA256_ACTUAL" ]; then \
@@ -1848,7 +1861,7 @@ endif
 libbz2.a:
 	-rm -rf bzip2-$(BZIP2_VER)
 ifeq (,$(wildcard ./bzip2-$(BZIP2_VER).tar.gz))
-	curl --output bzip2-$(BZIP2_VER).tar.gz -L ${CURL_SSL_OPTS} ${BZIP2_DOWNLOAD_BASE}/bzip2-$(BZIP2_VER).tar.gz
+	curl --fail --output bzip2-$(BZIP2_VER).tar.gz --location ${CURL_SSL_OPTS} ${BZIP2_DOWNLOAD_BASE}/bzip2-$(BZIP2_VER).tar.gz
 endif
 	BZIP2_SHA256_ACTUAL=`$(SHA256_CMD) bzip2-$(BZIP2_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(BZIP2_SHA256)" != "$$BZIP2_SHA256_ACTUAL" ]; then \
@@ -1862,7 +1875,7 @@ endif
 libsnappy.a:
 	-rm -rf snappy-$(SNAPPY_VER)
 ifeq (,$(wildcard ./snappy-$(SNAPPY_VER).tar.gz))
-	curl --output snappy-$(SNAPPY_VER).tar.gz -L ${CURL_SSL_OPTS} ${SNAPPY_DOWNLOAD_BASE}/$(SNAPPY_VER).tar.gz
+	curl --fail --output snappy-$(SNAPPY_VER).tar.gz --location ${CURL_SSL_OPTS} ${SNAPPY_DOWNLOAD_BASE}/$(SNAPPY_VER).tar.gz
 endif
 	SNAPPY_SHA256_ACTUAL=`$(SHA256_CMD) snappy-$(SNAPPY_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(SNAPPY_SHA256)" != "$$SNAPPY_SHA256_ACTUAL" ]; then \
@@ -1877,7 +1890,7 @@ endif
 liblz4.a:
 	-rm -rf lz4-$(LZ4_VER)
 ifeq (,$(wildcard ./lz4-$(LZ4_VER).tar.gz))
-	curl --output lz4-$(LZ4_VER).tar.gz -L ${CURL_SSL_OPTS} ${LZ4_DOWNLOAD_BASE}/v$(LZ4_VER).tar.gz
+	curl --fail --output lz4-$(LZ4_VER).tar.gz --location ${CURL_SSL_OPTS} ${LZ4_DOWNLOAD_BASE}/v$(LZ4_VER).tar.gz
 endif
 	LZ4_SHA256_ACTUAL=`$(SHA256_CMD) lz4-$(LZ4_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(LZ4_SHA256)" != "$$LZ4_SHA256_ACTUAL" ]; then \
@@ -1891,7 +1904,7 @@ endif
 libzstd.a:
 	-rm -rf zstd-$(ZSTD_VER)
 ifeq (,$(wildcard ./zstd-$(ZSTD_VER).tar.gz))
-	curl --output zstd-$(ZSTD_VER).tar.gz -L ${CURL_SSL_OPTS} ${ZSTD_DOWNLOAD_BASE}/v$(ZSTD_VER).tar.gz
+	curl --fail --output zstd-$(ZSTD_VER).tar.gz --location ${CURL_SSL_OPTS} ${ZSTD_DOWNLOAD_BASE}/v$(ZSTD_VER).tar.gz
 endif
 	ZSTD_SHA256_ACTUAL=`$(SHA256_CMD) zstd-$(ZSTD_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(ZSTD_SHA256)" != "$$ZSTD_SHA256_ACTUAL" ]; then \
@@ -1961,35 +1974,35 @@ rocksdbjavastaticreleasedocker: rocksdbjavastatic rocksdbjavastaticdockerx86 roc

 rocksdbjavastaticdockerx86:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_x86-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos6_x86-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_x86-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos6_x86-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticdockerx86_64:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_x64-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos6_x64-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_x64-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos6_x64-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticdockerppc64le:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_ppc64le-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos7_ppc64le-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_ppc64le-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos7_ppc64le-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticdockerarm64v8:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_arm64v8-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos7_arm64v8-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_arm64v8-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos7_arm64v8-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticdockerx86musl:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_x86-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_x86-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_x86-musl-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_x86-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticdockerx86_64musl:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_x64-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_x64-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_x64-musl-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_x64-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticdockerppc64lemusl:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_ppc64le-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_ppc64le-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_ppc64le-musl-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_ppc64le-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticdockerarm64v8musl:
 	mkdir -p java/target
-	docker run --rm --name rocksdb_linux_arm64v8-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_arm64v8-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+	docker run --rm --name rocksdb_linux_arm64v8-musl-be --attach stdin --attach stdout --attach stderr --volume $(HOME)/.m2:/root/.m2:ro --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_arm64v8-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh

 rocksdbjavastaticpublish: rocksdbjavastaticrelease rocksdbjavastaticpublishcentral

@@ -26,14 +26,13 @@ ROCKSDB_EXTERNAL_DEPS = [
    ("lz4", None, "lz4"),
    ("zstd", None),
    ("tbb", None),
-    ("liburing", None, "uring"),
    ("googletest", None, "gtest"),
 ]

 ROCKSDB_OS_DEPS = [
    (
        "linux",
-        ["third-party//numa:numa"],
+        ["third-party//numa:numa", "third-party//liburing:uring"],
    ),
 ]

@@ -49,6 +48,7 @@ ROCKSDB_OS_PREPROCESSOR_FLAGS = [
            "-DROCKSDB_SCHED_GETCPU_PRESENT",
            "-DROCKSDB_IOURING_PRESENT",
            "-DHAVE_SSE42",
+            "-DLIBURING",
            "-DNUMA",
        ],
    ),
@@ -72,7 +72,6 @@ ROCKSDB_PREPROCESSOR_FLAGS = [
    "-DZSTD_STATIC_LINKING_ONLY",
    "-DGFLAGS=gflags",
    "-DTBB",
-    "-DLIBURING",

    # Added missing flags from output of build_detect_platform
    "-DROCKSDB_BACKTRACE",
@@ -284,6 +283,7 @@ cpp_library(
        "util/concurrent_task_limiter_impl.cc",
        "util/crc32c.cc",
        "util/dynamic_bloom.cc",
+        "util/file_checksum_helper.cc",
        "util/hash.cc",
        "util/murmurhash.cc",
        "util/random.cc",
@@ -904,6 +904,13 @@ ROCKS_TESTS = [
        [],
        [],
    ],
+    [
+        "defer_test",
+        "util/defer_test.cc",
+        "serial",
+        [],
+        [],
+    ],
    [
        "delete_scheduler_test",
        "file/delete_scheduler_test.cc",
@@ -1310,6 +1317,13 @@ ROCKS_TESTS = [
        [],
        [],
    ],
+    [
+        "slice_test",
+        "util/slice_test.cc",
+        "serial",
+        [],
+        [],
+    ],
    [
        "slice_transform_test",
        "util/slice_transform_test.cc",
@@ -102,3 +102,7 @@ LzLabs is using RocksDB as a storage engine in their multi-database distributed
 
 ## Crux
 [Crux](https://github.com/juxt/crux) is a document database that uses RocksDB for local [EAV](https://en.wikipedia.org/wiki/Entity%E2%80%93attribute%E2%80%93value_model) index storage to enable point-in-time bitemporal Datalog queries. The "unbundled" architecture uses Kafka to provide horizontal scalability.
+
+## Nebula Graph
+
+[Nebula Graph](https://github.com/vesoft-inc/nebula) is a distributed, scalable, lightning-fast, open source graph database capable of hosting super large scale graphs with dozens of billions of vertices (nodes) and trillions of edges, with milliseconds of latency.
@@ -29,7 +29,7 @@ install:
  - md %THIRDPARTY_HOME%
  - echo "Building Snappy dependency..."
  - cd %THIRDPARTY_HOME%
-  - curl -fsSL -o snappy-1.1.7.zip https://github.com/google/snappy/archive/1.1.7.zip
+  - curl --fail --silent --show-error --output snappy-1.1.7.zip --location https://github.com/google/snappy/archive/1.1.7.zip
  - unzip snappy-1.1.7.zip
  - cd snappy-1.1.7
  - mkdir build
@@ -39,7 +39,7 @@ install:
  - msbuild Snappy.sln /p:Configuration=Release /p:Platform=x64
  - echo "Building LZ4 dependency..."
  - cd %THIRDPARTY_HOME%
-  - curl -fsSL -o lz4-1.8.3.zip https://github.com/lz4/lz4/archive/v1.8.3.zip
+  - curl --fail --silent --show-error --output lz4-1.8.3.zip --location https://github.com/lz4/lz4/archive/v1.8.3.zip
  - unzip lz4-1.8.3.zip
  - cd lz4-1.8.3\visual\VS2010
  - ps: $CMD="$Env:DEV_ENV"; & $CMD lz4.sln /upgrade
@@ -47,7 +47,7 @@ install:
  - msbuild lz4.sln /p:Configuration=Release /p:Platform=x64
  - echo "Building ZStd dependency..."
  - cd %THIRDPARTY_HOME%
-  - curl -fsSL -o zstd-1.4.0.zip https://github.com/facebook/zstd/archive/v1.4.0.zip
+  - curl --fail --silent --show-error --output zstd-1.4.0.zip --location https://github.com/facebook/zstd/archive/v1.4.0.zip
  - unzip zstd-1.4.0.zip
  - cd zstd-1.4.0\build\VS2010
  - ps: $CMD="$Env:DEV_ENV"; & $CMD zstd.sln /upgrade
@@ -32,14 +32,13 @@ ROCKSDB_EXTERNAL_DEPS = [
    ("lz4", None, "lz4"),
    ("zstd", None),
    ("tbb", None),
-    ("liburing", None, "uring"),
    ("googletest", None, "gtest"),
 ]

 ROCKSDB_OS_DEPS = [
    (
        "linux",
-        ["third-party//numa:numa"],
+        ["third-party//numa:numa", "third-party//liburing:uring"],
    ),
 ]

@@ -55,6 +54,7 @@ ROCKSDB_OS_PREPROCESSOR_FLAGS = [
            "-DROCKSDB_SCHED_GETCPU_PRESENT",
            "-DROCKSDB_IOURING_PRESENT",
            "-DHAVE_SSE42",
+            "-DLIBURING",
            "-DNUMA",
        ],
    ),
@@ -78,7 +78,6 @@ ROCKSDB_PREPROCESSOR_FLAGS = [
    "-DZSTD_STATIC_LINKING_ONLY",
    "-DGFLAGS=gflags",
    "-DTBB",
-    "-DLIBURING",

    # Added missing flags from output of build_detect_platform
    "-DROCKSDB_BACKTRACE",
@@ -150,18 +150,20 @@ case "$TARGET_OS" in
            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -latomic"
        fi
        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lpthread -lrt"
-        # check for liburing
-        $CXX $CFLAGS -x c++ - -luring -o /dev/null 2>/dev/null  <<EOF
-          #include <liburing.h>
-          int main() {
-            struct io_uring ring;
-            io_uring_queue_init(1, &ring, 0);
-            return 0;
-          }
+        if test $ROCKSDB_USE_IO_URING; then
+            # check for liburing
+            $CXX $CFLAGS -x c++ - -luring -o /dev/null 2>/dev/null  <<EOF
+              #include <liburing.h>
+              int main() {
+                struct io_uring ring;
+                io_uring_queue_init(1, &ring, 0);
+                return 0;
+              }
 EOF
-        if [ "$?" = 0 ]; then
-          PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -luring"
-          COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_IOURING_PRESENT"
+            if [ "$?" = 0 ]; then
+                PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -luring"
+                COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_IOURING_PRESENT"
+            fi
        fi
        if test -z "$USE_FOLLY_DISTRIBUTED_MUTEX"; then
          USE_FOLLY_DISTRIBUTED_MUTEX=1
@@ -378,7 +378,7 @@ function send_to_ods {
    echo >&2 "ERROR: Key $key doesn't have a value."
    return
  fi
-  curl -s "https://www.intern.facebook.com/intern/agent/ods_set.php?entity=rocksdb_build$git_br&key=$key&value=$value" \
+  curl --silent "https://www.intern.facebook.com/intern/agent/ods_set.php?entity=rocksdb_build$git_br&key=$key&value=$value" \
    --connect-timeout 60
 }

@@ -414,7 +414,8 @@ STRESS_CRASH_TEST_COMMANDS="[
                'shell':'$SHM $DEBUG $NON_TSAN_CRASH make J=1 crash_test || $CONTRUN_NAME=crash_test $TASK_CREATION_TOOL',
                'user':'root',
                $PARSER
-            }
+            },
+            $UPLOAD_DB_DIR,
        ],
        $REPORT
    }
@@ -542,6 +543,7 @@ ASAN_CRASH_TEST_COMMANDS="[
                'user':'root',
                $PARSER
            },
+            $UPLOAD_DB_DIR,
        ],
        $REPORT
    }
@@ -634,6 +636,7 @@ UBSAN_CRASH_TEST_COMMANDS="[
                'user':'root',
                $PARSER
            },
+            $UPLOAD_DB_DIR,
        ],
        $REPORT
    }
@@ -751,6 +754,7 @@ TSAN_CRASH_TEST_COMMANDS="[
                'user':'root',
                $PARSER
            },
+            $UPLOAD_DB_DIR,
        ],
        $REPORT
    }
@@ -880,7 +884,7 @@ run_regression()

  # parameters: $1 -- key, $2 -- value
  function send_size_to_ods {
-    curl -s "https://www.intern.facebook.com/intern/agent/ods_set.php?entity=rocksdb_build&key=rocksdb.build_size.$1&value=$2" \
+    curl --silent "https://www.intern.facebook.com/intern/agent/ods_set.php?entity=rocksdb_build&key=rocksdb.build_size.$1&value=$2" \
      --connect-timeout 60
  }

@@ -1059,5 +1063,6 @@ case $1 in
    ;;
  *)
    echo "Invalid determinator command"
+    exit 1
    ;;
 esac
@@ -45,7 +45,7 @@ DEFINE_int32(erase_percent, 10,

 DEFINE_bool(use_clock_cache, false, "");

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class CacheBench;
 namespace {
@@ -154,7 +154,7 @@ class CacheBench {
  }

  bool Run() {
-    rocksdb::Env* env = rocksdb::Env::Default();
+    ROCKSDB_NAMESPACE::Env* env = ROCKSDB_NAMESPACE::Env::Default();

    PrintEnv();
    SharedState shared(this);
@@ -257,7 +257,7 @@ class CacheBench {
    printf("----------------------------\n");
  }
 };
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ParseCommandLineFlags(&argc, &argv, true);
@@ -267,7 +267,7 @@ int main(int argc, char** argv) {
    exit(1);
  }

-  rocksdb::CacheBench bench;
+  ROCKSDB_NAMESPACE::CacheBench bench;
  if (FLAGS_populate_cache) {
    bench.PopulateCache();
  }
@@ -20,7 +20,7 @@
 #include "util/coding.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // Conversions between numeric keys/values and the types expected by Cache.
 static std::string EncodeKey(int k) {
@@ -765,7 +765,7 @@ INSTANTIATE_TEST_CASE_P(CacheTestInstance, CacheTest, testing::Values(kLRU));
 #endif  // SUPPORT_CLOCK_CACHE
 INSTANTIATE_TEST_CASE_P(CacheTestInstance, LRUCacheTest, testing::Values(kLRU));

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -11,7 +11,7 @@

 #ifndef SUPPORT_CLOCK_CACHE

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 std::shared_ptr<Cache> NewClockCache(
    size_t /*capacity*/, int /*num_shard_bits*/, bool /*strict_capacity_limit*/,
@@ -20,7 +20,7 @@ std::shared_ptr<Cache> NewClockCache(
  return nullptr;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #else

@@ -41,7 +41,7 @@ std::shared_ptr<Cache> NewClockCache(
 #include "util/autovector.h"
 #include "util/mutexlock.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 namespace {

@@ -756,6 +756,6 @@ std::shared_ptr<Cache> NewClockCache(
      capacity, num_shard_bits, strict_capacity_limit, metadata_charge_policy);
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // SUPPORT_CLOCK_CACHE
@@ -16,7 +16,7 @@

 #include "util/mutexlock.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 LRUHandleTable::LRUHandleTable() : list_(nullptr), length_(0), elems_(0) {
  Resize();
@@ -571,4 +571,4 @@ std::shared_ptr<Cache> NewLRUCache(
      std::move(memory_allocator), use_adaptive_mutex, metadata_charge_policy);
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -16,7 +16,7 @@
 #include "port/port.h"
 #include "util/autovector.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // LRU cache implementation. This class is not thread-safe.

@@ -336,4 +336,4 @@ class LRUCache
  int num_shards_ = 0;
 };

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -10,7 +10,7 @@
 #include "port/port.h"
 #include "test_util/testharness.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class LRUCacheTest : public testing::Test {
 public:
@@ -190,7 +190,7 @@ TEST_F(LRUCacheTest, EntriesWithPriority) {
  ValidateLRUList({"e", "f", "g", "Z", "d"}, 2);
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -13,7 +13,7 @@

 #include "util/mutexlock.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 ShardedCache::ShardedCache(size_t capacity, int num_shard_bits,
                           bool strict_capacity_limit,
@@ -159,4 +159,4 @@ int GetDefaultCacheShardBits(size_t capacity) {
  return num_shard_bits;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -16,7 +16,7 @@
 #include "rocksdb/cache.h"
 #include "util/hash.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // Single cache shard interface.
 class CacheShard {
@@ -108,4 +108,4 @@ class ShardedCache : public Cache {

 extern int GetDefaultCacheShardBits(size_t capacity);

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -16,7 +16,7 @@
 #include "table/iterator_wrapper.h"
 #include "util/user_comparator_wrapper.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 Status ArenaWrappedDBIter::GetProperty(std::string prop_name,
                                       std::string* prop) {
@@ -103,4 +103,4 @@ ArenaWrappedDBIter* NewArenaWrappedDbIterator(
  return iter;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -20,7 +20,7 @@
 #include "rocksdb/iterator.h"
 #include "util/autovector.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class Arena;

@@ -45,26 +45,26 @@ class ArenaWrappedDBIter : public Iterator {
  // Set the internal iterator wrapped inside the DB Iterator. Usually it is
  // a merging iterator.
  virtual void SetIterUnderDBIter(InternalIterator* iter) {
-    static_cast<DBIter*>(db_iter_)->SetIter(iter);
+    db_iter_->SetIter(iter);
  }

-  virtual bool Valid() const override { return db_iter_->Valid(); }
-  virtual void SeekToFirst() override { db_iter_->SeekToFirst(); }
-  virtual void SeekToLast() override { db_iter_->SeekToLast(); }
-  virtual void Seek(const Slice& target) override { db_iter_->Seek(target); }
-  virtual void SeekForPrev(const Slice& target) override {
+  bool Valid() const override { return db_iter_->Valid(); }
+  void SeekToFirst() override { db_iter_->SeekToFirst(); }
+  void SeekToLast() override { db_iter_->SeekToLast(); }
+  void Seek(const Slice& target) override { db_iter_->Seek(target); }
+  void SeekForPrev(const Slice& target) override {
    db_iter_->SeekForPrev(target);
  }
-  virtual void Next() override { db_iter_->Next(); }
-  virtual void Prev() override { db_iter_->Prev(); }
-  virtual Slice key() const override { return db_iter_->key(); }
-  virtual Slice value() const override { return db_iter_->value(); }
-  virtual Status status() const override { return db_iter_->status(); }
+  void Next() override { db_iter_->Next(); }
+  void Prev() override { db_iter_->Prev(); }
+  Slice key() const override { return db_iter_->key(); }
+  Slice value() const override { return db_iter_->value(); }
+  Status status() const override { return db_iter_->status(); }
  bool IsBlob() const { return db_iter_->IsBlob(); }

-  virtual Status GetProperty(std::string prop_name, std::string* prop) override;
+  Status GetProperty(std::string prop_name, std::string* prop) override;

-  virtual Status Refresh() override;
+  Status Refresh() override;

  void Init(Env* env, const ReadOptions& read_options,
            const ImmutableCFOptions& cf_options,
@@ -109,4 +109,4 @@ extern ArenaWrappedDBIter* NewArenaWrappedDbIterator(
    ReadCallback* read_callback, DBImpl* db_impl = nullptr,
    ColumnFamilyData* cfd = nullptr, bool allow_blob = false,
    bool allow_refresh = true);
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -12,7 +12,7 @@
 #include "util/coding.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // BlobIndex is a pointer to the blob and metadata of the blob. The index is
 // stored in base DB as ValueType::kTypeBlobIndex.
@@ -175,5 +175,5 @@ class BlobIndex {
  CompressionType compression_ = kNoCompression;
 };

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
 #endif  // ROCKSDB_LITE
@@ -37,7 +37,7 @@
 #include "test_util/sync_point.h"
 #include "util/stop_watch.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class TableFactory;

@@ -131,9 +131,10 @@ Status BuildTable(
      file->SetIOPriority(io_priority);
      file->SetWriteLifeTimeHint(write_hint);

-      file_writer.reset(
-          new WritableFileWriter(std::move(file), fname, file_options, env,
-                                 ioptions.statistics, ioptions.listeners));
+      file_writer.reset(new WritableFileWriter(
+          std::move(file), fname, file_options, env, ioptions.statistics,
+          ioptions.listeners, ioptions.sst_file_checksum_func));
+
      builder = NewTableBuilder(
          ioptions, mutable_cf_options, internal_comparator,
          int_tbl_prop_collector_factories, column_family_id,
@@ -199,6 +200,9 @@ Status BuildTable(
      if (table_properties) {
        *table_properties = tp;
      }
+      // Add the checksum information to file metadata.
+      meta->file_checksum = builder->GetFileChecksum();
+      meta->file_checksum_func_name = builder->GetFileChecksumFuncName();
    }
    delete builder;

@@ -256,4 +260,4 @@ Status BuildTable(
  return s;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -22,7 +22,7 @@
 #include "rocksdb/types.h"
 #include "table/scoped_arena_iterator.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 struct Options;
 struct FileMetaData;
@@ -85,4 +85,4 @@ extern Status BuildTable(
    Env::WriteLifeTimeHint write_hint = Env::WLTH_NOT_SET,
    const uint64_t file_creation_time = 0);

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -46,74 +46,74 @@
 #include <unordered_set>
 #include <map>

-using rocksdb::BytewiseComparator;
-using rocksdb::Cache;
-using rocksdb::ColumnFamilyDescriptor;
-using rocksdb::ColumnFamilyHandle;
-using rocksdb::ColumnFamilyOptions;
-using rocksdb::CompactionFilter;
-using rocksdb::CompactionFilterFactory;
-using rocksdb::CompactionFilterContext;
-using rocksdb::CompactionOptionsFIFO;
-using rocksdb::Comparator;
-using rocksdb::CompressionType;
-using rocksdb::WALRecoveryMode;
-using rocksdb::DB;
-using rocksdb::DBOptions;
-using rocksdb::DbPath;
-using rocksdb::Env;
-using rocksdb::EnvOptions;
-using rocksdb::InfoLogLevel;
-using rocksdb::FileLock;
-using rocksdb::FilterPolicy;
-using rocksdb::FlushOptions;
-using rocksdb::IngestExternalFileOptions;
-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::SstFileWriter;
-using rocksdb::Status;
-using rocksdb::WritableFile;
-using rocksdb::WriteBatch;
-using rocksdb::WriteBatchWithIndex;
-using rocksdb::WriteOptions;
-using rocksdb::LiveFileMetaData;
-using rocksdb::BackupEngine;
-using rocksdb::BackupableDBOptions;
-using rocksdb::BackupInfo;
-using rocksdb::BackupID;
-using rocksdb::RestoreOptions;
-using rocksdb::CompactRangeOptions;
-using rocksdb::BottommostLevelCompaction;
-using rocksdb::RateLimiter;
-using rocksdb::NewGenericRateLimiter;
-using rocksdb::PinnableSlice;
-using rocksdb::TransactionDBOptions;
-using rocksdb::TransactionDB;
-using rocksdb::TransactionOptions;
-using rocksdb::OptimisticTransactionDB;
-using rocksdb::OptimisticTransactionOptions;
-using rocksdb::Transaction;
-using rocksdb::Checkpoint;
-using rocksdb::TransactionLogIterator;
-using rocksdb::BatchResult;
-using rocksdb::PerfLevel;
-using rocksdb::PerfContext;
-using rocksdb::MemoryUtil;
+using ROCKSDB_NAMESPACE::BackupableDBOptions;
+using ROCKSDB_NAMESPACE::BackupEngine;
+using ROCKSDB_NAMESPACE::BackupID;
+using ROCKSDB_NAMESPACE::BackupInfo;
+using ROCKSDB_NAMESPACE::BatchResult;
+using ROCKSDB_NAMESPACE::BlockBasedTableOptions;
+using ROCKSDB_NAMESPACE::BottommostLevelCompaction;
+using ROCKSDB_NAMESPACE::BytewiseComparator;
+using ROCKSDB_NAMESPACE::Cache;
+using ROCKSDB_NAMESPACE::Checkpoint;
+using ROCKSDB_NAMESPACE::ColumnFamilyDescriptor;
+using ROCKSDB_NAMESPACE::ColumnFamilyHandle;
+using ROCKSDB_NAMESPACE::ColumnFamilyOptions;
+using ROCKSDB_NAMESPACE::CompactionFilter;
+using ROCKSDB_NAMESPACE::CompactionFilterContext;
+using ROCKSDB_NAMESPACE::CompactionFilterFactory;
+using ROCKSDB_NAMESPACE::CompactionOptionsFIFO;
+using ROCKSDB_NAMESPACE::CompactRangeOptions;
+using ROCKSDB_NAMESPACE::Comparator;
+using ROCKSDB_NAMESPACE::CompressionType;
+using ROCKSDB_NAMESPACE::CuckooTableOptions;
+using ROCKSDB_NAMESPACE::DB;
+using ROCKSDB_NAMESPACE::DBOptions;
+using ROCKSDB_NAMESPACE::DbPath;
+using ROCKSDB_NAMESPACE::Env;
+using ROCKSDB_NAMESPACE::EnvOptions;
+using ROCKSDB_NAMESPACE::FileLock;
+using ROCKSDB_NAMESPACE::FilterPolicy;
+using ROCKSDB_NAMESPACE::FlushOptions;
+using ROCKSDB_NAMESPACE::InfoLogLevel;
+using ROCKSDB_NAMESPACE::IngestExternalFileOptions;
+using ROCKSDB_NAMESPACE::Iterator;
+using ROCKSDB_NAMESPACE::LiveFileMetaData;
+using ROCKSDB_NAMESPACE::Logger;
+using ROCKSDB_NAMESPACE::MemoryUtil;
+using ROCKSDB_NAMESPACE::MergeOperator;
+using ROCKSDB_NAMESPACE::MergeOperators;
+using ROCKSDB_NAMESPACE::NewBloomFilterPolicy;
+using ROCKSDB_NAMESPACE::NewGenericRateLimiter;
+using ROCKSDB_NAMESPACE::NewLRUCache;
+using ROCKSDB_NAMESPACE::OptimisticTransactionDB;
+using ROCKSDB_NAMESPACE::OptimisticTransactionOptions;
+using ROCKSDB_NAMESPACE::Options;
+using ROCKSDB_NAMESPACE::PerfContext;
+using ROCKSDB_NAMESPACE::PerfLevel;
+using ROCKSDB_NAMESPACE::PinnableSlice;
+using ROCKSDB_NAMESPACE::RandomAccessFile;
+using ROCKSDB_NAMESPACE::Range;
+using ROCKSDB_NAMESPACE::RateLimiter;
+using ROCKSDB_NAMESPACE::ReadOptions;
+using ROCKSDB_NAMESPACE::RestoreOptions;
+using ROCKSDB_NAMESPACE::SequentialFile;
+using ROCKSDB_NAMESPACE::Slice;
+using ROCKSDB_NAMESPACE::SliceParts;
+using ROCKSDB_NAMESPACE::SliceTransform;
+using ROCKSDB_NAMESPACE::Snapshot;
+using ROCKSDB_NAMESPACE::SstFileWriter;
+using ROCKSDB_NAMESPACE::Status;
+using ROCKSDB_NAMESPACE::Transaction;
+using ROCKSDB_NAMESPACE::TransactionDB;
+using ROCKSDB_NAMESPACE::TransactionDBOptions;
+using ROCKSDB_NAMESPACE::TransactionLogIterator;
+using ROCKSDB_NAMESPACE::TransactionOptions;
+using ROCKSDB_NAMESPACE::WALRecoveryMode;
+using ROCKSDB_NAMESPACE::WritableFile;
+using ROCKSDB_NAMESPACE::WriteBatch;
+using ROCKSDB_NAMESPACE::WriteBatchWithIndex;
+using ROCKSDB_NAMESPACE::WriteOptions;

 using std::shared_ptr;
 using std::vector;
@@ -452,7 +452,7 @@ struct rocksdb_slicetransform_t : public SliceTransform {
 };

 struct rocksdb_universal_compaction_options_t {
-  rocksdb::CompactionOptionsUniversal *rep;
+  ROCKSDB_NAMESPACE::CompactionOptionsUniversal* rep;
 };

 static bool SaveError(char** errptr, const Status& s) {
@@ -494,8 +494,9 @@ rocksdb_t* rocksdb_open_with_ttl(
    const char* name,
    int ttl,
    char** errptr) {
-  rocksdb::DBWithTTL* db;
-  if (SaveError(errptr, rocksdb::DBWithTTL::Open(options->rep, std::string(name), &db, ttl))) {
+  ROCKSDB_NAMESPACE::DBWithTTL* db;
+  if (SaveError(errptr, ROCKSDB_NAMESPACE::DBWithTTL::Open(
+                            options->rep, std::string(name), &db, ttl))) {
    return nullptr;
  }
  rocksdb_t* result = new rocksdb_t;
@@ -664,17 +665,15 @@ void rocksdb_close(rocksdb_t* db) {
 }

 void rocksdb_options_set_uint64add_merge_operator(rocksdb_options_t* opt) {
-  opt->rep.merge_operator = rocksdb::MergeOperators::CreateUInt64AddOperator();
+  opt->rep.merge_operator =
+      ROCKSDB_NAMESPACE::MergeOperators::CreateUInt64AddOperator();
 }

 rocksdb_t* rocksdb_open_column_families(
-    const rocksdb_options_t* db_options,
-    const char* name,
-    int num_column_families,
-    const char** column_family_names,
-    const rocksdb_options_t** column_family_options,
-    rocksdb_column_family_handle_t** column_family_handles,
-    char** errptr) {
+    const rocksdb_options_t* db_options, const char* name,
+    int num_column_families, const char* const* column_family_names,
+    const rocksdb_options_t* const* column_family_options,
+    rocksdb_column_family_handle_t** column_family_handles, char** errptr) {
  std::vector<ColumnFamilyDescriptor> column_families;
  for (int i = 0; i < num_column_families; i++) {
    column_families.push_back(ColumnFamilyDescriptor(
@@ -700,14 +699,11 @@ rocksdb_t* rocksdb_open_column_families(
 }

 rocksdb_t* rocksdb_open_for_read_only_column_families(
-    const rocksdb_options_t* db_options,
-    const char* name,
-    int num_column_families,
-    const char** column_family_names,
-    const rocksdb_options_t** column_family_options,
+    const rocksdb_options_t* db_options, const char* name,
+    int num_column_families, const char* const* column_family_names,
+    const rocksdb_options_t* const* column_family_options,
    rocksdb_column_family_handle_t** column_family_handles,
-    unsigned char error_if_log_file_exist,
-    char** errptr) {
+    unsigned char error_if_log_file_exist, char** errptr) {
  std::vector<ColumnFamilyDescriptor> column_families;
  for (int i = 0; i < num_column_families; i++) {
    column_families.push_back(ColumnFamilyDescriptor(
@@ -735,8 +731,8 @@ rocksdb_t* rocksdb_open_for_read_only_column_families(
 rocksdb_t* rocksdb_open_as_secondary_column_families(
    const rocksdb_options_t* db_options, const char* name,
    const char* secondary_path, int num_column_families,
-    const char** column_family_names,
-    const rocksdb_options_t** column_family_options,
+    const char* const* column_family_names,
+    const rocksdb_options_t* const* column_family_options,
    rocksdb_column_family_handle_t** column_family_handles, char** errptr) {
  std::vector<ColumnFamilyDescriptor> column_families;
  for (int i = 0; i != num_column_families; ++i) {
@@ -2084,7 +2080,7 @@ void rocksdb_options_set_block_based_table_factory(
    rocksdb_block_based_table_options_t* table_options) {
  if (table_options) {
    opt->rep.table_factory.reset(
-        rocksdb::NewBlockBasedTableFactory(table_options->rep));
+        ROCKSDB_NAMESPACE::NewBlockBasedTableFactory(table_options->rep));
  }
 }

@@ -2128,7 +2124,7 @@ void rocksdb_options_set_cuckoo_table_factory(
    rocksdb_cuckoo_table_options_t* table_options) {
  if (table_options) {
    opt->rep.table_factory.reset(
-        rocksdb::NewCuckooTableFactory(table_options->rep));
+        ROCKSDB_NAMESPACE::NewCuckooTableFactory(table_options->rep));
  }
 }

@@ -2318,7 +2314,7 @@ void rocksdb_options_set_max_bytes_for_level_multiplier_additional(
 }

 void rocksdb_options_enable_statistics(rocksdb_options_t* opt) {
-  opt->rep.statistics = rocksdb::CreateDBStatistics();
+  opt->rep.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
 }

 void rocksdb_options_set_skip_stats_update_on_db_open(rocksdb_options_t* opt,
@@ -2326,6 +2322,11 @@ void rocksdb_options_set_skip_stats_update_on_db_open(rocksdb_options_t* opt,
  opt->rep.skip_stats_update_on_db_open = val;
 }

+void rocksdb_options_set_skip_checking_sst_file_sizes_on_db_open(
+    rocksdb_options_t* opt, unsigned char val) {
+  opt->rep.skip_checking_sst_file_sizes_on_db_open = val;
+}
+
 void rocksdb_options_set_num_levels(rocksdb_options_t* opt, int n) {
  opt->rep.num_levels = n;
 }
@@ -2469,16 +2470,20 @@ void rocksdb_options_set_access_hint_on_compaction_start(
    rocksdb_options_t* opt, int v) {
  switch(v) {
    case 0:
-      opt->rep.access_hint_on_compaction_start = rocksdb::Options::NONE;
+      opt->rep.access_hint_on_compaction_start =
+          ROCKSDB_NAMESPACE::Options::NONE;
      break;
    case 1:
-      opt->rep.access_hint_on_compaction_start = rocksdb::Options::NORMAL;
+      opt->rep.access_hint_on_compaction_start =
+          ROCKSDB_NAMESPACE::Options::NORMAL;
      break;
    case 2:
-      opt->rep.access_hint_on_compaction_start = rocksdb::Options::SEQUENTIAL;
+      opt->rep.access_hint_on_compaction_start =
+          ROCKSDB_NAMESPACE::Options::SEQUENTIAL;
      break;
    case 3:
-      opt->rep.access_hint_on_compaction_start = rocksdb::Options::WILLNEED;
+      opt->rep.access_hint_on_compaction_start =
+          ROCKSDB_NAMESPACE::Options::WILLNEED;
      break;
  }
 }
@@ -2644,7 +2649,7 @@ void rocksdb_options_prepare_for_bulk_load(rocksdb_options_t* opt) {
 }

 void rocksdb_options_set_memtable_vector_rep(rocksdb_options_t *opt) {
-  opt->rep.memtable_factory.reset(new rocksdb::VectorRepFactory);
+  opt->rep.memtable_factory.reset(new ROCKSDB_NAMESPACE::VectorRepFactory);
 }

 void rocksdb_options_set_memtable_prefix_bloom_size_ratio(
@@ -2660,26 +2665,29 @@ void rocksdb_options_set_memtable_huge_page_size(rocksdb_options_t* opt,
 void rocksdb_options_set_hash_skip_list_rep(
    rocksdb_options_t *opt, size_t bucket_count,
    int32_t skiplist_height, int32_t skiplist_branching_factor) {
-  rocksdb::MemTableRepFactory* factory = rocksdb::NewHashSkipListRepFactory(
-      bucket_count, skiplist_height, skiplist_branching_factor);
+  ROCKSDB_NAMESPACE::MemTableRepFactory* factory =
+      ROCKSDB_NAMESPACE::NewHashSkipListRepFactory(
+          bucket_count, skiplist_height, skiplist_branching_factor);
  opt->rep.memtable_factory.reset(factory);
 }

 void rocksdb_options_set_hash_link_list_rep(
    rocksdb_options_t *opt, size_t bucket_count) {
-  opt->rep.memtable_factory.reset(rocksdb::NewHashLinkListRepFactory(bucket_count));
+  opt->rep.memtable_factory.reset(
+      ROCKSDB_NAMESPACE::NewHashLinkListRepFactory(bucket_count));
 }

 void rocksdb_options_set_plain_table_factory(
    rocksdb_options_t *opt, uint32_t user_key_len, int bloom_bits_per_key,
    double hash_table_ratio, size_t index_sparseness) {
-  rocksdb::PlainTableOptions options;
+  ROCKSDB_NAMESPACE::PlainTableOptions options;
  options.user_key_len = user_key_len;
  options.bloom_bits_per_key = bloom_bits_per_key;
  options.hash_table_ratio = hash_table_ratio;
  options.index_sparseness = index_sparseness;

-  rocksdb::TableFactory* factory = rocksdb::NewPlainTableFactory(options);
+  ROCKSDB_NAMESPACE::TableFactory* factory =
+      ROCKSDB_NAMESPACE::NewPlainTableFactory(options);
  opt->rep.table_factory.reset(factory);
 }

@@ -2709,7 +2717,8 @@ void rocksdb_options_set_report_bg_io_stats(
 }

 void rocksdb_options_set_compaction_style(rocksdb_options_t *opt, int style) {
-  opt->rep.compaction_style = static_cast<rocksdb::CompactionStyle>(style);
+  opt->rep.compaction_style =
+      static_cast<ROCKSDB_NAMESPACE::CompactionStyle>(style);
 }

 void rocksdb_options_set_universal_compaction_options(rocksdb_options_t *opt, rocksdb_universal_compaction_options_t *uco) {
@@ -2723,7 +2732,7 @@ void rocksdb_options_set_fifo_compaction_options(
 }

 char *rocksdb_options_statistics_get_string(rocksdb_options_t *opt) {
-  rocksdb::Statistics *statistics = opt->rep.statistics.get();
+  ROCKSDB_NAMESPACE::Statistics* statistics = opt->rep.statistics.get();
  if (statistics) {
    return strdup(statistics->ToString().c_str());
  }
@@ -2736,6 +2745,11 @@ void rocksdb_options_set_ratelimiter(rocksdb_options_t *opt, rocksdb_ratelimiter
  }
 }

+void rocksdb_options_set_atomic_flush(rocksdb_options_t* opt,
+                                      unsigned char atomic_flush) {
+  opt->rep.atomic_flush = atomic_flush;
+}
+
 rocksdb_ratelimiter_t* rocksdb_ratelimiter_create(
    int64_t rate_bytes_per_sec,
    int64_t refill_period_us,
@@ -2751,6 +2765,12 @@ void rocksdb_ratelimiter_destroy(rocksdb_ratelimiter_t *limiter) {
  delete limiter;
 }

+void rocksdb_options_set_row_cache(rocksdb_options_t* opt, rocksdb_cache_t* cache) {
+  if(cache) {
+    opt->rep.row_cache = cache->rep;
+  }
+}
+
 void rocksdb_set_perf_level(int v) {
  PerfLevel level = static_cast<PerfLevel>(v);
  SetPerfLevel(level);
@@ -2758,7 +2778,7 @@ void rocksdb_set_perf_level(int v) {

 rocksdb_perfcontext_t* rocksdb_perfcontext_create() {
  rocksdb_perfcontext_t* context = new rocksdb_perfcontext_t;
-  context->rep = rocksdb::get_perf_context();
+  context->rep = ROCKSDB_NAMESPACE::get_perf_context();
  return context;
 }

@@ -3060,11 +3080,12 @@ rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom_format(int bits_per_ke
      return rep_->KeyMayMatch(key, filter);
    }
    // No need to override GetFilterBitsBuilder if this one is overridden
-    rocksdb::FilterBitsBuilder* GetBuilderWithContext(
-        const rocksdb::FilterBuildingContext& context) const override {
+    ROCKSDB_NAMESPACE::FilterBitsBuilder* GetBuilderWithContext(
+        const ROCKSDB_NAMESPACE::FilterBuildingContext& context)
+        const override {
      return rep_->GetBuilderWithContext(context);
    }
-    rocksdb::FilterBitsReader* GetFilterBitsReader(
+    ROCKSDB_NAMESPACE::FilterBitsReader* GetFilterBitsReader(
        const Slice& contents) const override {
      return rep_->GetFilterBitsReader(contents);
    }
@@ -3166,7 +3187,7 @@ void rocksdb_readoptions_set_iterate_lower_bound(

 void rocksdb_readoptions_set_read_tier(
    rocksdb_readoptions_t* opt, int v) {
-  opt->rep.read_tier = static_cast<rocksdb::ReadTier>(v);
+  opt->rep.read_tier = static_cast<ROCKSDB_NAMESPACE::ReadTier>(v);
 }

 void rocksdb_readoptions_set_tailing(
@@ -3338,7 +3359,7 @@ rocksdb_env_t* rocksdb_create_default_env() {

 rocksdb_env_t* rocksdb_create_mem_env() {
  rocksdb_env_t* result = new rocksdb_env_t;
-  result->rep = rocksdb::NewMemEnv(Env::Default());
+  result->rep = ROCKSDB_NAMESPACE::NewMemEnv(Env::Default());
  result->is_default = false;
  return result;
 }
@@ -3553,7 +3574,7 @@ struct Wrapper : public rocksdb_slicetransform_t {

 rocksdb_slicetransform_t* rocksdb_slicetransform_create_fixed_prefix(size_t prefixLen) {
  Wrapper* wrapper = new Wrapper;
-  wrapper->rep_ = rocksdb::NewFixedPrefixTransform(prefixLen);
+  wrapper->rep_ = ROCKSDB_NAMESPACE::NewFixedPrefixTransform(prefixLen);
  wrapper->state_ = nullptr;
  wrapper->destructor_ = &Wrapper::DoNothing;
  return wrapper;
@@ -3561,7 +3582,7 @@ rocksdb_slicetransform_t* rocksdb_slicetransform_create_fixed_prefix(size_t pref

 rocksdb_slicetransform_t* rocksdb_slicetransform_create_noop() {
  Wrapper* wrapper = new Wrapper;
-  wrapper->rep_ = rocksdb::NewNoopTransform();
+  wrapper->rep_ = ROCKSDB_NAMESPACE::NewNoopTransform();
  wrapper->state_ = nullptr;
  wrapper->destructor_ = &Wrapper::DoNothing;
  return wrapper;
@@ -3569,7 +3590,7 @@ rocksdb_slicetransform_t* rocksdb_slicetransform_create_noop() {

 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;
+  result->rep = new ROCKSDB_NAMESPACE::CompactionOptionsUniversal;
  return result;
 }

@@ -3600,7 +3621,8 @@ void rocksdb_universal_compaction_options_set_compression_size_percent(

 void rocksdb_universal_compaction_options_set_stop_style(
  rocksdb_universal_compaction_options_t* uco, int style) {
-  uco->rep->stop_style = static_cast<rocksdb::CompactionStopStyle>(style);
+  uco->rep->stop_style =
+      static_cast<ROCKSDB_NAMESPACE::CompactionStopStyle>(style);
 }

 void rocksdb_universal_compaction_options_destroy(
@@ -3630,7 +3652,7 @@ void rocksdb_options_set_min_level_to_compress(rocksdb_options_t* opt, int level
    assert(level <= opt->rep.num_levels);
    opt->rep.compression_per_level.resize(opt->rep.num_levels);
    for (int i = 0; i < level; i++) {
-      opt->rep.compression_per_level[i] = rocksdb::kNoCompression;
+      opt->rep.compression_per_level[i] = ROCKSDB_NAMESPACE::kNoCompression;
    }
    for (int i = level; i < opt->rep.num_levels; i++) {
      opt->rep.compression_per_level[i] = opt->rep.compression;
@@ -3837,8 +3859,8 @@ rocksdb_transactiondb_t* rocksdb_transactiondb_open(
 rocksdb_transactiondb_t* rocksdb_transactiondb_open_column_families(
    const rocksdb_options_t* options,
    const rocksdb_transactiondb_options_t* txn_db_options, const char* name,
-    int num_column_families, const char** column_family_names,
-    const rocksdb_options_t** column_family_options,
+    int num_column_families, const char* const* column_family_names,
+    const rocksdb_options_t* const* column_family_options,
    rocksdb_column_family_handle_t** column_family_handles, char** errptr) {
  std::vector<ColumnFamilyDescriptor> column_families;
  for (int i = 0; i < num_column_families; i++) {
@@ -4215,8 +4237,8 @@ rocksdb_optimistictransactiondb_t* rocksdb_optimistictransactiondb_open(
 rocksdb_optimistictransactiondb_t*
 rocksdb_optimistictransactiondb_open_column_families(
    const rocksdb_options_t* db_options, const char* name,
-    int num_column_families, const char** column_family_names,
-    const rocksdb_options_t** column_family_options,
+    int num_column_families, const char* const* column_family_names,
+    const rocksdb_options_t* const* column_family_options,
    rocksdb_column_family_handle_t** column_family_handles, char** errptr) {
  std::vector<ColumnFamilyDescriptor> column_families;
  for (int i = 0; i < num_column_families; i++) {
@@ -4332,7 +4354,8 @@ const char* rocksdb_pinnableslice_value(const rocksdb_pinnableslice_t* v,
  return v->rep.data();
 }

-// container to keep databases and caches in order to use rocksdb::MemoryUtil
+// container to keep databases and caches in order to use
+// ROCKSDB_NAMESPACE::MemoryUtil
 struct rocksdb_memory_consumers_t {
  std::vector<rocksdb_t*> dbs;
  std::unordered_set<rocksdb_cache_t*> caches;
@@ -4360,7 +4383,7 @@ void rocksdb_memory_consumers_destroy(rocksdb_memory_consumers_t* consumers) {
  delete consumers;
 }

-// contains memory usage statistics provided by rocksdb::MemoryUtil
+// contains memory usage statistics provided by ROCKSDB_NAMESPACE::MemoryUtil
 struct rocksdb_memory_usage_t {
  uint64_t mem_table_total;
  uint64_t mem_table_unflushed;
@@ -4382,7 +4405,7 @@ rocksdb_memory_usage_t* rocksdb_approximate_memory_usage_create(
    cache_set.insert(const_cast<const Cache*>(cache->rep.get()));
  }

-  std::map<rocksdb::MemoryUtil::UsageType, uint64_t> usage_by_type;
+  std::map<ROCKSDB_NAMESPACE::MemoryUtil::UsageType, uint64_t> usage_by_type;

  auto status = MemoryUtil::GetApproximateMemoryUsageByType(dbs, cache_set,
                                                            &usage_by_type);
@@ -835,23 +835,6 @@ int main(int argc, char** argv) {
    rocksdb_writebatch_wi_iterate(wbi, &pos, CheckPut, CheckDel);
    CheckCondition(pos == 3);
    rocksdb_writebatch_wi_clear(wbi);
-    rocksdb_writebatch_wi_put(wbi, "bar", 3, "b", 1);
-    rocksdb_writebatch_wi_put(wbi, "bay", 3, "d", 1);
-    rocksdb_writebatch_wi_delete_range(wbi, "bar", 3, "bay", 3);
-    rocksdb_write_writebatch_wi(db, woptions, wbi, &err);
-    CheckNoError(err);
-    CheckGet(db, roptions, "bar", NULL);
-    CheckGet(db, roptions, "bay", "d");
-    rocksdb_writebatch_wi_clear(wbi);
-    const char* start_list[1] = {"bay"};
-    const size_t start_sizes[1] = {3};
-    const char* end_list[1] = {"baz"};
-    const size_t end_sizes[1] = {3};
-    rocksdb_writebatch_wi_delete_rangev(wbi, 1, start_list, start_sizes, end_list,
-                                     end_sizes);
-    rocksdb_write_writebatch_wi(db, woptions, wbi, &err);
-    CheckNoError(err);
-    CheckGet(db, roptions, "bay", NULL);
    rocksdb_writebatch_wi_destroy(wbi);
  }

@@ -36,7 +36,7 @@
 #include "util/autovector.h"
 #include "util/compression.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 ColumnFamilyHandleImpl::ColumnFamilyHandleImpl(
    ColumnFamilyData* column_family_data, DBImpl* db, InstrumentedMutex* mutex)
@@ -160,11 +160,6 @@ Status CheckConcurrentWritesSupported(const ColumnFamilyOptions& cf_options) {
    return Status::InvalidArgument(
        "Memtable doesn't concurrent writes (allow_concurrent_memtable_write)");
  }
-  if (cf_options.max_successive_merges != 0) {
-    return Status::InvalidArgument(
-        "max_successive_merges > 0 is incompatible "
-        "with concurrent writes (allow_concurrent_memtable_write)");
-  }
  return Status::OK();
 }

@@ -1252,6 +1247,11 @@ Status ColumnFamilyData::ValidateOptions(
  if (s.ok() && db_options.allow_concurrent_memtable_write) {
    s = CheckConcurrentWritesSupported(cf_options);
  }
+  if (s.ok() && db_options.unordered_write &&
+      cf_options.max_successive_merges != 0) {
+    s = Status::InvalidArgument(
+        "max_successive_merges > 0 is incompatible with unordered_write");
+  }
  if (s.ok()) {
    s = CheckCFPathsSupported(db_options, cf_options);
  }
@@ -1320,17 +1320,26 @@ Env::WriteLifeTimeHint ColumnFamilyData::CalculateSSTWriteHint(int level) {
                            static_cast<int>(Env::WLTH_MEDIUM));
 }

-Status ColumnFamilyData::AddDirectories() {
+Status ColumnFamilyData::AddDirectories(
+    std::map<std::string, std::shared_ptr<Directory>>* created_dirs) {
  Status s;
+  assert(created_dirs != nullptr);
  assert(data_dirs_.empty());
  for (auto& p : ioptions_.cf_paths) {
-    std::unique_ptr<Directory> path_directory;
-    s = DBImpl::CreateAndNewDirectory(ioptions_.env, p.path, &path_directory);
-    if (!s.ok()) {
-      return s;
+    auto existing_dir = created_dirs->find(p.path);
+
+    if (existing_dir == created_dirs->end()) {
+      std::unique_ptr<Directory> path_directory;
+      s = DBImpl::CreateAndNewDirectory(ioptions_.env, p.path, &path_directory);
+      if (!s.ok()) {
+        return s;
+      }
+      assert(path_directory != nullptr);
+      data_dirs_.emplace_back(path_directory.release());
+      (*created_dirs)[p.path] = data_dirs_.back();
+    } else {
+      data_dirs_.emplace_back(existing_dir->second);
    }
-    assert(path_directory != nullptr);
-    data_dirs_.emplace_back(path_directory.release());
  }
  assert(data_dirs_.size() == ioptions_.cf_paths.size());
  return s;
@@ -1511,4 +1520,4 @@ const Comparator* GetColumnFamilyUserComparator(
  return nullptr;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -27,7 +27,7 @@
 #include "trace_replay/block_cache_tracer.h"
 #include "util/thread_local.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class Version;
 class VersionSet;
@@ -497,7 +497,10 @@ class ColumnFamilyData {

  Env::WriteLifeTimeHint CalculateSSTWriteHint(int level);

-  Status AddDirectories();
+  // created_dirs remembers directory created, so that we don't need to call
+  // the same data creation operation again.
+  Status AddDirectories(
+      std::map<std::string, std::shared_ptr<Directory>>* created_dirs);

  Directory* GetDataDir(size_t path_id) const;

@@ -589,7 +592,7 @@ class ColumnFamilyData {
  std::atomic<uint64_t> last_memtable_id_;

  // Directories corresponding to cf_paths.
-  std::vector<std::unique_ptr<Directory>> data_dirs_;
+  std::vector<std::shared_ptr<Directory>> data_dirs_;
 };

 // ColumnFamilySet has interesting thread-safety requirements
@@ -751,4 +754,4 @@ extern uint32_t GetColumnFamilyID(ColumnFamilyHandle* column_family);
 extern const Comparator* GetColumnFamilyUserComparator(
    ColumnFamilyHandle* column_family);

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -30,7 +30,7 @@
 #include "util/string_util.h"
 #include "utilities/merge_operators.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 static const int kValueSize = 1000;

@@ -91,7 +91,7 @@ class ColumnFamilyTestBase : public testing::Test {
      column_families.push_back(cfdescriptor);
    }
    Close();
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
    Destroy(column_families);
    delete env_;
  }
@@ -595,14 +595,15 @@ TEST_P(ColumnFamilyTest, DontReuseColumnFamilyID) {
 TEST_P(ColumnFamilyTest, CreateCFRaceWithGetAggProperty) {
  Open();

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBImpl::WriteOptionsFile:1",
        "ColumnFamilyTest.CreateCFRaceWithGetAggProperty:1"},
       {"ColumnFamilyTest.CreateCFRaceWithGetAggProperty:2",
        "DBImpl::WriteOptionsFile:2"}});
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

-  rocksdb::port::Thread thread([&] { CreateColumnFamilies({"one"}); });
+  ROCKSDB_NAMESPACE::port::Thread thread(
+      [&] { CreateColumnFamilies({"one"}); });

  TEST_SYNC_POINT("ColumnFamilyTest.CreateCFRaceWithGetAggProperty:1");
  uint64_t pv;
@@ -611,7 +612,7 @@ TEST_P(ColumnFamilyTest, CreateCFRaceWithGetAggProperty) {

  thread.join();

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }
 #endif  // !ROCKSDB_LITE

@@ -1253,13 +1254,14 @@ TEST_P(ColumnFamilyTest, DifferentWriteBufferSizes) {
 // #endif  // !ROCKSDB_LITE

 class TestComparator : public Comparator {
-  int Compare(const rocksdb::Slice& /*a*/,
-              const rocksdb::Slice& /*b*/) const override {
+  int Compare(const ROCKSDB_NAMESPACE::Slice& /*a*/,
+              const ROCKSDB_NAMESPACE::Slice& /*b*/) const override {
    return 0;
  }
  const char* Name() const override { return "Test"; }
-  void FindShortestSeparator(std::string* /*start*/,
-                             const rocksdb::Slice& /*limit*/) const override {}
+  void FindShortestSeparator(
+      std::string* /*start*/,
+      const ROCKSDB_NAMESPACE::Slice& /*limit*/) const override {}
  void FindShortSuccessor(std::string* /*key*/) const override {}
 };

@@ -1427,11 +1429,11 @@ TEST_P(ColumnFamilyTest, MultipleManualCompactions) {
    AssertFilesPerLevel(ToString(i + 1), 1);
  }
  bool cf_1_1 = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"ColumnFamilyTest::MultiManual:4", "ColumnFamilyTest::MultiManual:1"},
       {"ColumnFamilyTest::MultiManual:2", "ColumnFamilyTest::MultiManual:5"},
       {"ColumnFamilyTest::MultiManual:2", "ColumnFamilyTest::MultiManual:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (cf_1_1) {
          TEST_SYNC_POINT("ColumnFamilyTest::MultiManual:4");
@@ -1440,7 +1442,7 @@ TEST_P(ColumnFamilyTest, MultipleManualCompactions) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  std::vector<port::Thread> threads;
  threads.emplace_back([&] {
    CompactRangeOptions compact_options;
@@ -1483,8 +1485,8 @@ TEST_P(ColumnFamilyTest, MultipleManualCompactions) {
    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
    key_iter++;
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
  Close();
 }

@@ -1523,11 +1525,11 @@ TEST_P(ColumnFamilyTest, AutomaticAndManualCompactions) {
      dbfull()->TEST_write_controler().GetCompactionPressureToken();

  bool cf_1_1 = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"ColumnFamilyTest::AutoManual:4", "ColumnFamilyTest::AutoManual:1"},
       {"ColumnFamilyTest::AutoManual:2", "ColumnFamilyTest::AutoManual:5"},
       {"ColumnFamilyTest::AutoManual:2", "ColumnFamilyTest::AutoManual:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (cf_1_1) {
          cf_1_1 = false;
@@ -1535,7 +1537,7 @@ TEST_P(ColumnFamilyTest, AutomaticAndManualCompactions) {
          TEST_SYNC_POINT("ColumnFamilyTest::AutoManual:3");
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  // SETUP column family "one" -- universal style
  for (int i = 0; i < one.level0_file_num_compaction_trigger; ++i) {
    PutRandomData(1, 10, 12000, true);
@@ -1553,7 +1555,7 @@ TEST_P(ColumnFamilyTest, AutomaticAndManualCompactions) {
    WaitForFlush(2);
    AssertFilesPerLevel(ToString(i + 1), 2);
  }
-  rocksdb::port::Thread threads([&] {
+  ROCKSDB_NAMESPACE::port::Thread threads([&] {
    CompactRangeOptions compact_options;
    compact_options.exclusive_manual_compaction = false;
    ASSERT_OK(
@@ -1580,8 +1582,8 @@ TEST_P(ColumnFamilyTest, AutomaticAndManualCompactions) {
    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
    key_iter++;
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }

 TEST_P(ColumnFamilyTest, ManualAndAutomaticCompactions) {
@@ -1627,11 +1629,11 @@ TEST_P(ColumnFamilyTest, ManualAndAutomaticCompactions) {
  }
  bool cf_1_1 = true;
  bool cf_1_2 = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"ColumnFamilyTest::ManualAuto:4", "ColumnFamilyTest::ManualAuto:1"},
       {"ColumnFamilyTest::ManualAuto:5", "ColumnFamilyTest::ManualAuto:2"},
       {"ColumnFamilyTest::ManualAuto:2", "ColumnFamilyTest::ManualAuto:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (cf_1_1) {
          TEST_SYNC_POINT("ColumnFamilyTest::ManualAuto:4");
@@ -1643,8 +1645,8 @@ TEST_P(ColumnFamilyTest, ManualAndAutomaticCompactions) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  rocksdb::port::Thread threads([&] {
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::port::Thread threads([&] {
    CompactRangeOptions compact_options;
    compact_options.exclusive_manual_compaction = false;
    ASSERT_OK(
@@ -1679,8 +1681,8 @@ TEST_P(ColumnFamilyTest, ManualAndAutomaticCompactions) {
    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
    key_iter++;
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }

 TEST_P(ColumnFamilyTest, SameCFManualManualCompactions) {
@@ -1721,13 +1723,13 @@ TEST_P(ColumnFamilyTest, SameCFManualManualCompactions) {
  }
  bool cf_1_1 = true;
  bool cf_1_2 = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"ColumnFamilyTest::ManualManual:4", "ColumnFamilyTest::ManualManual:2"},
       {"ColumnFamilyTest::ManualManual:4", "ColumnFamilyTest::ManualManual:5"},
       {"ColumnFamilyTest::ManualManual:1", "ColumnFamilyTest::ManualManual:2"},
       {"ColumnFamilyTest::ManualManual:1",
        "ColumnFamilyTest::ManualManual:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (cf_1_1) {
          TEST_SYNC_POINT("ColumnFamilyTest::ManualManual:4");
@@ -1739,8 +1741,8 @@ TEST_P(ColumnFamilyTest, SameCFManualManualCompactions) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  rocksdb::port::Thread threads([&] {
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::port::Thread threads([&] {
    CompactRangeOptions compact_options;
    compact_options.exclusive_manual_compaction = true;
    ASSERT_OK(
@@ -1760,7 +1762,7 @@ TEST_P(ColumnFamilyTest, SameCFManualManualCompactions) {
                        1);
  }

-  rocksdb::port::Thread threads1([&] {
+  ROCKSDB_NAMESPACE::port::Thread threads1([&] {
    CompactRangeOptions compact_options;
    compact_options.exclusive_manual_compaction = false;
    ASSERT_OK(
@@ -1781,8 +1783,8 @@ TEST_P(ColumnFamilyTest, SameCFManualManualCompactions) {
    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
    key_iter++;
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }

 TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactions) {
@@ -1823,12 +1825,12 @@ TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactions) {
  }
  bool cf_1_1 = true;
  bool cf_1_2 = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"ColumnFamilyTest::ManualAuto:4", "ColumnFamilyTest::ManualAuto:2"},
       {"ColumnFamilyTest::ManualAuto:4", "ColumnFamilyTest::ManualAuto:5"},
       {"ColumnFamilyTest::ManualAuto:1", "ColumnFamilyTest::ManualAuto:2"},
       {"ColumnFamilyTest::ManualAuto:1", "ColumnFamilyTest::ManualAuto:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (cf_1_1) {
          TEST_SYNC_POINT("ColumnFamilyTest::ManualAuto:4");
@@ -1840,8 +1842,8 @@ TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactions) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  rocksdb::port::Thread threads([&] {
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::port::Thread threads([&] {
    CompactRangeOptions compact_options;
    compact_options.exclusive_manual_compaction = false;
    ASSERT_OK(
@@ -1874,8 +1876,8 @@ TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactions) {
    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
    key_iter++;
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }

 TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactionsLevel) {
@@ -1916,14 +1918,14 @@ TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactionsLevel) {
  }
  bool cf_1_1 = true;
  bool cf_1_2 = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"ColumnFamilyTest::ManualAuto:4", "ColumnFamilyTest::ManualAuto:2"},
       {"ColumnFamilyTest::ManualAuto:4", "ColumnFamilyTest::ManualAuto:5"},
       {"ColumnFamilyTest::ManualAuto:3", "ColumnFamilyTest::ManualAuto:2"},
       {"LevelCompactionPicker::PickCompactionBySize:0",
        "ColumnFamilyTest::ManualAuto:3"},
       {"ColumnFamilyTest::ManualAuto:1", "ColumnFamilyTest::ManualAuto:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (cf_1_1) {
          TEST_SYNC_POINT("ColumnFamilyTest::ManualAuto:4");
@@ -1935,8 +1937,8 @@ TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactionsLevel) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  rocksdb::port::Thread threads([&] {
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::port::Thread threads([&] {
    CompactRangeOptions compact_options;
    compact_options.exclusive_manual_compaction = false;
    ASSERT_OK(
@@ -1967,8 +1969,8 @@ TEST_P(ColumnFamilyTest, SameCFManualAutomaticCompactionsLevel) {
    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
    key_iter++;
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }

 // In this test, we generate enough files to trigger automatic compactions.
@@ -2008,12 +2010,12 @@ TEST_P(ColumnFamilyTest, SameCFAutomaticManualCompactions) {

  bool cf_1_1 = true;
  bool cf_1_2 = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"ColumnFamilyTest::AutoManual:4", "ColumnFamilyTest::AutoManual:2"},
       {"ColumnFamilyTest::AutoManual:4", "ColumnFamilyTest::AutoManual:5"},
       {"CompactionPicker::CompactRange:Conflict",
        "ColumnFamilyTest::AutoManual:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (cf_1_1) {
          TEST_SYNC_POINT("ColumnFamilyTest::AutoManual:4");
@@ -2025,7 +2027,7 @@ TEST_P(ColumnFamilyTest, SameCFAutomaticManualCompactions) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // SETUP column family "one" -- universal style
  for (int i = 0; i < one.level0_file_num_compaction_trigger; ++i) {
@@ -2059,8 +2061,8 @@ TEST_P(ColumnFamilyTest, SameCFAutomaticManualCompactions) {
    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
    key_iter++;
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }
 #endif  // !ROCKSDB_LITE

@@ -2415,7 +2417,7 @@ TEST_P(ColumnFamilyTest, FlushAndDropRaceCondition) {
  options.write_buffer_size = 100000;  // small write buffer size
  Reopen({options, options});

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"VersionSet::LogAndApply::ColumnFamilyDrop:0",
        "FlushJob::WriteLevel0Table"},
       {"VersionSet::LogAndApply::ColumnFamilyDrop:1",
@@ -2423,7 +2425,7 @@ TEST_P(ColumnFamilyTest, FlushAndDropRaceCondition) {
       {"FlushJob::InstallResults",
        "VersionSet::LogAndApply::ColumnFamilyDrop:2"}});

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  test::SleepingBackgroundTask sleeping_task;

  env_->Schedule(&test::SleepingBackgroundTask::DoSleepTask, &sleeping_task,
@@ -2502,21 +2504,21 @@ TEST_P(ColumnFamilyTest, CreateAndDropRace) {

  auto main_thread_id = std::this_thread::get_id();

-  rocksdb::SyncPoint::GetInstance()->SetCallBack("PersistRocksDBOptions:start",
-                                                 [&](void* /*arg*/) {
-    auto current_thread_id = std::this_thread::get_id();
-    // If it's the main thread hitting this sync-point, then it
-    // will be blocked until some other thread update the test_stage.
-    if (main_thread_id == current_thread_id) {
-      test_stage = kMainThreadStartPersistingOptionsFile;
-      while (test_stage < kChildThreadFinishDroppingColumnFamily &&
-             !ordered_by_writethread) {
-        Env::Default()->SleepForMicroseconds(100);
-      }
-    }
-  });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "PersistRocksDBOptions:start", [&](void* /*arg*/) {
+        auto current_thread_id = std::this_thread::get_id();
+        // If it's the main thread hitting this sync-point, then it
+        // will be blocked until some other thread update the test_stage.
+        if (main_thread_id == current_thread_id) {
+          test_stage = kMainThreadStartPersistingOptionsFile;
+          while (test_stage < kChildThreadFinishDroppingColumnFamily &&
+                 !ordered_by_writethread) {
+            Env::Default()->SleepForMicroseconds(100);
+          }
+        }
+      });

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "WriteThread::EnterUnbatched:Wait", [&](void* /*arg*/) {
        // This means a thread doing DropColumnFamily() is waiting for
        // other thread to finish persisting options.
@@ -2528,12 +2530,12 @@ TEST_P(ColumnFamilyTest, CreateAndDropRace) {
  Open({"default", "one", "two", "three"},
       {cf_opts[0], cf_opts[1], cf_opts[2], cf_opts[3]});

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Start a thread that will drop the first column family
  // and its comparator
-  rocksdb::port::Thread drop_cf_thread(DropSingleColumnFamily, this, 1,
-                                       &comparators);
+  ROCKSDB_NAMESPACE::port::Thread drop_cf_thread(DropSingleColumnFamily, this,
+                                                 1, &comparators);

  DropColumnFamilies({2});

@@ -2546,8 +2548,8 @@ TEST_P(ColumnFamilyTest, CreateAndDropRace) {
    }
  }

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }
 #endif  // !ROCKSDB_LITE

@@ -2982,10 +2984,10 @@ TEST_P(ColumnFamilyTest, FlushCloseWALFiles) {
  ASSERT_OK(Put(0, "fodor", "mirko"));
  ASSERT_OK(Put(1, "fodor", "mirko"));

-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"DBImpl::BGWorkFlush:done", "FlushCloseWALFiles:0"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Block flush jobs from running
  test::SleepingBackgroundTask sleeping_task;
@@ -3001,7 +3003,7 @@ TEST_P(ColumnFamilyTest, FlushCloseWALFiles) {
  sleeping_task.WakeUp();
  sleeping_task.WaitUntilDone();
  TEST_SYNC_POINT("FlushCloseWALFiles:0");
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  ASSERT_EQ(1, env.num_open_wal_file_.load());

  Reopen();
@@ -3079,14 +3081,14 @@ TEST_P(ColumnFamilyTest, IteratorCloseWALFile2) {
  ASSERT_OK(Put(0, "fodor", "mirko"));
  ASSERT_OK(Put(1, "fodor", "mirko"));

-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"ColumnFamilyTest::IteratorCloseWALFile2:0",
       "DBImpl::BGWorkPurge:start"},
      {"ColumnFamilyTest::IteratorCloseWALFile2:2",
       "DBImpl::BackgroundCallFlush:start"},
      {"DBImpl::BGWorkPurge:end", "ColumnFamilyTest::IteratorCloseWALFile2:1"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  WriteOptions wo;
  wo.sync = true;
@@ -3104,7 +3106,7 @@ TEST_P(ColumnFamilyTest, IteratorCloseWALFile2) {
  TEST_SYNC_POINT("ColumnFamilyTest::IteratorCloseWALFile2:2");
  WaitForFlush(1);
  ASSERT_EQ(1, env.num_open_wal_file_.load());
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  Reopen();
  ASSERT_EQ("mirko", Get(0, "fodor"));
@@ -3148,14 +3150,14 @@ TEST_P(ColumnFamilyTest, ForwardIteratorCloseWALFile) {
  ASSERT_OK(Put(0, "fodor", "mirko"));
  ASSERT_OK(Put(1, "fodor", "mirko"));

-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"ColumnFamilyTest::IteratorCloseWALFile2:0",
       "DBImpl::BGWorkPurge:start"},
      {"ColumnFamilyTest::IteratorCloseWALFile2:2",
       "DBImpl::BackgroundCallFlush:start"},
      {"DBImpl::BGWorkPurge:end", "ColumnFamilyTest::IteratorCloseWALFile2:1"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  WriteOptions wo;
  wo.sync = true;
@@ -3179,7 +3181,7 @@ TEST_P(ColumnFamilyTest, ForwardIteratorCloseWALFile) {
  ASSERT_EQ(1, env.delete_count_.load());

  delete it;
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  Reopen();
  ASSERT_EQ("mirko", Get(0, "fodor"));
@@ -3199,15 +3201,15 @@ TEST_P(ColumnFamilyTest, LogSyncConflictFlush) {
  Put(0, "", "");
  Put(1, "foo", "bar");

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBImpl::SyncWAL:BeforeMarkLogsSynced:1",
        "ColumnFamilyTest::LogSyncConflictFlush:1"},
       {"ColumnFamilyTest::LogSyncConflictFlush:2",
        "DBImpl::SyncWAL:BeforeMarkLogsSynced:2"}});

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

-  rocksdb::port::Thread thread([&] { db_->SyncWAL(); });
+  ROCKSDB_NAMESPACE::port::Thread thread([&] { db_->SyncWAL(); });

  TEST_SYNC_POINT("ColumnFamilyTest::LogSyncConflictFlush:1");
  Flush(1);
@@ -3218,7 +3220,7 @@ TEST_P(ColumnFamilyTest, LogSyncConflictFlush) {

  thread.join();

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  Close();
 }
 #endif
@@ -3367,7 +3369,7 @@ TEST_P(ColumnFamilyTest, MultipleCFPathsTest) {
  }
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #ifdef ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS
 extern "C" {
@@ -3378,7 +3380,7 @@ void RegisterCustomObjects(int /*argc*/, char** /*argv*/) {}
 #endif  // !ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  RegisterCustomObjects(argc, argv);
  return RUN_ALL_TESTS();
@@ -18,7 +18,7 @@
 #include "test_util/testharness.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class CompactFilesTest : public testing::Test {
 public:
@@ -81,11 +81,11 @@ TEST_F(CompactFilesTest, L0ConflictsFiles) {
  assert(s.ok());
  assert(db);

-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"CompactFilesImpl:0", "BackgroundCallCompaction:0"},
      {"BackgroundCallCompaction:1", "CompactFilesImpl:1"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // create couple files
  // Background compaction starts and waits in BackgroundCallCompaction:0
@@ -95,7 +95,7 @@ TEST_F(CompactFilesTest, L0ConflictsFiles) {
    db->Flush(FlushOptions());
  }

-  rocksdb::ColumnFamilyMetaData meta;
+  ROCKSDB_NAMESPACE::ColumnFamilyMetaData meta;
  db->GetColumnFamilyMetaData(&meta);
  std::string file1;
  for (auto& file : meta.levels[0].files) {
@@ -108,12 +108,12 @@ TEST_F(CompactFilesTest, L0ConflictsFiles) {
      // The background compaction then notices that there is an L0 compaction
      // already in progress and doesn't do an L0 compaction
      // Once the background compaction finishes, the compact files finishes
-      ASSERT_OK(
-          db->CompactFiles(rocksdb::CompactionOptions(), {file1, file2}, 0));
+      ASSERT_OK(db->CompactFiles(ROCKSDB_NAMESPACE::CompactionOptions(),
+                                 {file1, file2}, 0));
      break;
    }
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  delete db;
 }

@@ -224,14 +224,14 @@ TEST_F(CompactFilesTest, CapturingPendingFiles) {
  auto l0_files = collector->GetFlushedFiles();
  EXPECT_EQ(5, l0_files.size());

-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"CompactFilesImpl:2", "CompactFilesTest.CapturingPendingFiles:0"},
      {"CompactFilesTest.CapturingPendingFiles:1", "CompactFilesImpl:3"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Start compacting files.
-  rocksdb::port::Thread compaction_thread(
+  ROCKSDB_NAMESPACE::port::Thread compaction_thread(
      [&] { EXPECT_OK(db->CompactFiles(CompactionOptions(), l0_files, 1)); });

  // In the meantime flush another file.
@@ -242,7 +242,7 @@ TEST_F(CompactFilesTest, CapturingPendingFiles) {

  compaction_thread.join();

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  delete db;

@@ -296,12 +296,12 @@ TEST_F(CompactFilesTest, CompactionFilterWithGetSv) {
  db->Flush(FlushOptions());

  // Compact all L0 files using CompactFiles
-  rocksdb::ColumnFamilyMetaData meta;
+  ROCKSDB_NAMESPACE::ColumnFamilyMetaData meta;
  db->GetColumnFamilyMetaData(&meta);
  for (auto& file : meta.levels[0].files) {
    std::string fname = file.db_path + "/" + file.name;
    ASSERT_OK(
-        db->CompactFiles(rocksdb::CompactionOptions(), {fname}, 0));
+        db->CompactFiles(ROCKSDB_NAMESPACE::CompactionOptions(), {fname}, 0));
  }


@@ -347,7 +347,7 @@ TEST_F(CompactFilesTest, SentinelCompressionType) {
    compaction_opts.compression = CompressionType::kDisableCompressionOption;
    ASSERT_OK(db->CompactFiles(compaction_opts, l0_files, 1));

-    rocksdb::TablePropertiesCollection all_tables_props;
+    ROCKSDB_NAMESPACE::TablePropertiesCollection all_tables_props;
    ASSERT_OK(db->GetPropertiesOfAllTables(&all_tables_props));
    for (const auto& name_and_table_props : all_tables_props) {
      ASSERT_EQ(CompressionTypeToString(CompressionType::kZlibCompression),
@@ -402,7 +402,7 @@ TEST_F(CompactFilesTest, GetCompactionJobInfo) {
  delete db;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -9,7 +9,7 @@
 #include "db/version_set.h"
 #include "table/get_context.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 extern void MarkKeyMayExist(void* arg);
 extern bool SaveValue(void* arg, const ParsedInternalKey& parsed_key,
@@ -156,5 +156,5 @@ Status CompactedDBImpl::Open(const Options& options,
  return s;
 }

-}   // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
 #endif  // ROCKSDB_LITE
@@ -9,7 +9,7 @@
 #include <vector>
 #include "db/db_impl/db_impl.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class CompactedDBImpl : public DBImpl {
 public:
@@ -109,5 +109,5 @@ class CompactedDBImpl : public DBImpl {
  const Comparator* user_comparator_;
  LevelFilesBrief files_;
 };
-}
+}  // namespace ROCKSDB_NAMESPACE
 #endif  // ROCKSDB_LITE
@@ -16,7 +16,7 @@
 #include "test_util/sync_point.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 const uint64_t kRangeTombstoneSentinel =
    PackSequenceAndType(kMaxSequenceNumber, kTypeRangeDeletion);
@@ -545,11 +545,13 @@ bool Compaction::ShouldFormSubcompactions() const {

 uint64_t Compaction::MinInputFileOldestAncesterTime() const {
  uint64_t min_oldest_ancester_time = port::kMaxUint64;
-  for (const auto& file : inputs_[0].files) {
-    uint64_t oldest_ancester_time = file->TryGetOldestAncesterTime();
-    if (oldest_ancester_time != 0) {
-      min_oldest_ancester_time =
-          std::min(min_oldest_ancester_time, oldest_ancester_time);
+  for (const auto& level_files : inputs_) {
+    for (const auto& file : level_files.files) {
+      uint64_t oldest_ancester_time = file->TryGetOldestAncesterTime();
+      if (oldest_ancester_time != 0) {
+        min_oldest_ancester_time =
+            std::min(min_oldest_ancester_time, oldest_ancester_time);
+      }
    }
  }
  return min_oldest_ancester_time;
@@ -559,4 +561,4 @@ int Compaction::GetInputBaseLevel() const {
  return input_vstorage_->base_level();
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -13,7 +13,7 @@
 #include "options/cf_options.h"
 #include "util/autovector.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 // The file contains class Compaction, as well as some helper functions
 // and data structures used by the class.

@@ -381,4 +381,4 @@ class Compaction {
 // Return sum of sizes of all files in `files`.
 extern uint64_t TotalFileSize(const std::vector<FileMetaData*>& files);

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -5,6 +5,8 @@

 #pragma once

+#include "rocksdb/rocksdb_namespace.h"
+
 struct CompactionIterationStats {
  // Compaction statistics

@@ -28,7 +28,7 @@
  ((seq) <= earliest_snapshot_ && \
   (snapshot_checker_ == nullptr || LIKELY(IsInEarliestSnapshot(seq))))

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 CompactionIterator::CompactionIterator(
    InternalIterator* input, const Comparator* cmp, MergeHelper* merge_helper,
@@ -771,4 +771,4 @@ bool CompactionIterator::IsInEarliestSnapshot(SequenceNumber sequence) {
  return in_snapshot == SnapshotCheckerResult::kInSnapshot;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -19,7 +19,7 @@
 #include "options/cf_options.h"
 #include "rocksdb/compaction_filter.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class CompactionIterator {
 public:
@@ -237,4 +237,4 @@ class CompactionIterator {
           manual_compaction_paused_->load(std::memory_order_relaxed);
  }
 };
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -14,7 +14,7 @@
 #include "util/string_util.h"
 #include "utilities/merge_operators.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // Expects no merging attempts.
 class NoMergingMergeOp : public MergeOperator {
@@ -494,7 +494,7 @@ TEST_P(CompactionIteratorTest, ShuttingDownInFilter) {
  compaction_proxy_->key_not_exists_beyond_output_level = true;

  std::atomic<bool> seek_done{false};
-  rocksdb::port::Thread compaction_thread([&] {
+  ROCKSDB_NAMESPACE::port::Thread compaction_thread([&] {
    c_iter_->SeekToFirst();
    EXPECT_FALSE(c_iter_->Valid());
    EXPECT_TRUE(c_iter_->status().IsShutdownInProgress());
@@ -531,7 +531,7 @@ TEST_P(CompactionIteratorTest, ShuttingDownInMerge) {
  compaction_proxy_->key_not_exists_beyond_output_level = true;

  std::atomic<bool> seek_done{false};
-  rocksdb::port::Thread compaction_thread([&] {
+  ROCKSDB_NAMESPACE::port::Thread compaction_thread([&] {
    c_iter_->SeekToFirst();
    ASSERT_FALSE(c_iter_->Valid());
    ASSERT_TRUE(c_iter_->status().IsShutdownInProgress());
@@ -968,7 +968,7 @@ TEST_F(CompactionIteratorWithSnapshotCheckerTest, CompactionFilter_FullMerge) {
      compaction_filter.get());
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -59,7 +59,7 @@
 #include "util/stop_watch.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 const char* GetCompactionReasonString(CompactionReason compaction_reason) {
  switch (compaction_reason) {
@@ -144,7 +144,6 @@ struct CompactionJob::SubcompactionState {

  // State during the subcompaction
  uint64_t total_bytes;
-  uint64_t num_input_records;
  uint64_t num_output_records;
  CompactionJobStats compaction_job_stats;
  uint64_t approx_size;
@@ -165,7 +164,6 @@ struct CompactionJob::SubcompactionState {
        builder(nullptr),
        current_output_file_size(0),
        total_bytes(0),
-        num_input_records(0),
        num_output_records(0),
        approx_size(size),
        grandparent_index(0),
@@ -186,7 +184,6 @@ struct CompactionJob::SubcompactionState {
    builder = std::move(o.builder);
    current_output_file_size = std::move(o.current_output_file_size);
    total_bytes = std::move(o.total_bytes);
-    num_input_records = std::move(o.num_input_records);
    num_output_records = std::move(o.num_output_records);
    compaction_job_stats = std::move(o.compaction_job_stats);
    approx_size = std::move(o.approx_size);
@@ -245,13 +242,11 @@ struct CompactionJob::CompactionState {
  Status status;

  uint64_t total_bytes;
-  uint64_t num_input_records;
  uint64_t num_output_records;

  explicit CompactionState(Compaction* c)
      : compaction(c),
        total_bytes(0),
-        num_input_records(0),
        num_output_records(0) {}

  size_t NumOutputFiles() {
@@ -289,7 +284,6 @@ struct CompactionJob::CompactionState {
 void CompactionJob::AggregateStatistics() {
  for (SubcompactionState& sc : compact_->sub_compact_states) {
    compact_->total_bytes += sc.total_bytes;
-    compact_->num_input_records += sc.num_input_records;
    compact_->num_output_records += sc.num_output_records;
  }
  if (compaction_job_stats_) {
@@ -770,12 +764,12 @@ Status CompactionJob::Install(const MutableCFOptions& mutable_cf_options) {
  auto stream = event_logger_->LogToBuffer(log_buffer_);
  stream << "job" << job_id_ << "event"
         << "compaction_finished"
-         << "compaction_time_micros" << compaction_stats_.micros
-         << "compaction_time_cpu_micros" << compaction_stats_.cpu_micros
-         << "output_level" << compact_->compaction->output_level()
-         << "num_output_files" << compact_->NumOutputFiles()
-         << "total_output_size" << compact_->total_bytes << "num_input_records"
-         << compact_->num_input_records << "num_output_records"
+         << "compaction_time_micros" << stats.micros
+         << "compaction_time_cpu_micros" << stats.cpu_micros << "output_level"
+         << compact_->compaction->output_level() << "num_output_files"
+         << compact_->NumOutputFiles() << "total_output_size"
+         << compact_->total_bytes << "num_input_records"
+         << stats.num_input_records << "num_output_records"
         << compact_->num_output_records << "num_subcompactions"
         << compact_->sub_compact_states.size() << "output_compression"
         << CompressionTypeToString(compact_->compaction->output_compression());
@@ -991,7 +985,6 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
    }
  }

-  sub_compact->num_input_records = c_iter_stats.num_input_records;
  sub_compact->compaction_job_stats.num_input_deletion_records =
      c_iter_stats.num_input_deletion_records;
  sub_compact->compaction_job_stats.num_corrupt_keys =
@@ -1303,6 +1296,11 @@ Status CompactionJob::FinishCompactionOutputFile(
  }
  const uint64_t current_bytes = sub_compact->builder->FileSize();
  if (s.ok()) {
+    // Add the checksum information to file metadata.
+    meta->file_checksum = sub_compact->builder->GetFileChecksum();
+    meta->file_checksum_func_name =
+        sub_compact->builder->GetFileChecksumFuncName();
+
    meta->fd.file_size = current_bytes;
  }
  sub_compact->current_output()->finished = true;
@@ -1515,7 +1513,8 @@ Status CompactionJob::OpenCompactionOutputFile(
      sub_compact->compaction->immutable_cf_options()->listeners;
  sub_compact->outfile.reset(
      new WritableFileWriter(std::move(writable_file), fname, file_options_,
-                             env_, db_options_.statistics.get(), listeners));
+                             env_, db_options_.statistics.get(), listeners,
+                             db_options_.sst_file_checksum_func.get()));

  // If the Column family flag is to only optimize filters for hits,
  // we can skip creating filters if this is the bottommost_level where
@@ -1589,6 +1588,8 @@ void CompactionJob::UpdateCompactionStats() {
    }
  }

+  uint64_t num_output_records = 0;
+
  for (const auto& sub_compact : compact_->sub_compact_states) {
    size_t num_output_files = sub_compact.outputs.size();
    if (sub_compact.builder != nullptr) {
@@ -1598,13 +1599,16 @@ void CompactionJob::UpdateCompactionStats() {
    }
    compaction_stats_.num_output_files += static_cast<int>(num_output_files);

+    num_output_records += sub_compact.num_output_records;
+
    for (const auto& out : sub_compact.outputs) {
      compaction_stats_.bytes_written += out.meta.fd.file_size;
    }
-    if (sub_compact.num_input_records > sub_compact.num_output_records) {
-      compaction_stats_.num_dropped_records +=
-          sub_compact.num_input_records - sub_compact.num_output_records;
-    }
+  }
+
+  if (compaction_stats_.num_input_records > num_output_records) {
+    compaction_stats_.num_dropped_records =
+        compaction_stats_.num_input_records - num_output_records;
  }
 }

@@ -1632,7 +1636,7 @@ void CompactionJob::UpdateCompactionJobStats(
    // input information
    compaction_job_stats_->total_input_bytes =
        stats.bytes_read_non_output_levels + stats.bytes_read_output_level;
-    compaction_job_stats_->num_input_records = compact_->num_input_records;
+    compaction_job_stats_->num_input_records = stats.num_input_records;
    compaction_job_stats_->num_input_files =
        stats.num_input_files_in_non_output_levels +
        stats.num_input_files_in_output_level;
@@ -1693,4 +1697,4 @@ void CompactionJob::LogCompaction() {
  }
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -44,7 +44,7 @@
 #include "util/stop_watch.h"
 #include "util/thread_local.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class Arena;
 class ErrorHandler;
@@ -195,4 +195,4 @@ class CompactionJob {
  Env::Priority thread_pri_;
 };

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -61,7 +61,7 @@

 #if !defined(IOS_CROSS_COMPILE)
 #ifndef ROCKSDB_LITE
-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 static std::string RandomString(Random* rnd, int len, double ratio) {
  std::string r;
@@ -110,9 +110,9 @@ class CompactionJobStatsTest : public testing::Test,
  }

  ~CompactionJobStatsTest() override {
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-    rocksdb::SyncPoint::GetInstance()->LoadDependency({});
-    rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({});
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
    Close();
    Options options;
    options.db_paths.emplace_back(dbname_, 0);
@@ -801,7 +801,7 @@ TEST_P(CompactionJobStatsTest, CompactionJobStatsTest) {

    stats_checker->set_verify_next_comp_io_stats(true);
    std::atomic<bool> first_prepare_write(true);
-    rocksdb::SyncPoint::GetInstance()->SetCallBack(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
        "WritableFileWriter::Append:BeforePrepareWrite", [&](void* /*arg*/) {
          if (first_prepare_write.load()) {
            options.env->SleepForMicroseconds(3);
@@ -810,7 +810,7 @@ TEST_P(CompactionJobStatsTest, CompactionJobStatsTest) {
        });

    std::atomic<bool> first_flush(true);
-    rocksdb::SyncPoint::GetInstance()->SetCallBack(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
        "WritableFileWriter::Flush:BeforeAppend", [&](void* /*arg*/) {
          if (first_flush.load()) {
            options.env->SleepForMicroseconds(3);
@@ -819,7 +819,7 @@ TEST_P(CompactionJobStatsTest, CompactionJobStatsTest) {
        });

    std::atomic<bool> first_sync(true);
-    rocksdb::SyncPoint::GetInstance()->SetCallBack(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
        "WritableFileWriter::SyncInternal:0", [&](void* /*arg*/) {
          if (first_sync.load()) {
            options.env->SleepForMicroseconds(3);
@@ -828,14 +828,14 @@ TEST_P(CompactionJobStatsTest, CompactionJobStatsTest) {
        });

    std::atomic<bool> first_range_sync(true);
-    rocksdb::SyncPoint::GetInstance()->SetCallBack(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
        "WritableFileWriter::RangeSync:0", [&](void* /*arg*/) {
          if (first_range_sync.load()) {
            options.env->SleepForMicroseconds(3);
            first_range_sync.store(false);
          }
        });
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    Compact(1, smallest_key, largest_key);

@@ -844,7 +844,7 @@ TEST_P(CompactionJobStatsTest, CompactionJobStatsTest) {
    ASSERT_TRUE(!first_flush.load());
    ASSERT_TRUE(!first_sync.load());
    ASSERT_TRUE(!first_range_sync.load());
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
  ASSERT_EQ(stats_checker->NumberOfUnverifiedStats(), 0U);
 }
@@ -1019,10 +1019,10 @@ TEST_P(CompactionJobStatsTest, UniversalCompactionTest) {

 INSTANTIATE_TEST_CASE_P(CompactionJobStatsTest, CompactionJobStatsTest,
                        ::testing::Values(1, 4));
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -29,7 +29,7 @@
 #include "util/string_util.h"
 #include "utilities/merge_operators.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 namespace {

@@ -187,7 +187,8 @@ class CompactionJobTest : public testing::Test {
    VersionEdit edit;
    edit.AddFile(level, file_number, 0, 10, smallest_key, largest_key,
                 smallest_seqno, largest_seqno, false, oldest_blob_file_number,
-                 kUnknownOldestAncesterTime, kUnknownFileCreationTime);
+                 kUnknownOldestAncesterTime, kUnknownFileCreationTime,
+                 kUnknownFileChecksum, kUnknownFileChecksumFuncName);

    mutex_.Lock();
    versions_->LogAndApply(versions_->GetColumnFamilySet()->GetDefault(),
@@ -1062,7 +1063,7 @@ TEST_F(CompactionJobTest, OldestBlobFileNumber) {
                /* expected_oldest_blob_file_number */ 19);
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -23,7 +23,7 @@
 #include "util/random.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 namespace {
 uint64_t TotalCompensatedFileSize(const std::vector<FileMetaData*>& files) {
@@ -1128,4 +1128,4 @@ bool CompactionPicker::GetOverlappingL0Files(
  return true;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -22,7 +22,7 @@
 #include "rocksdb/options.h"
 #include "rocksdb/status.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // The file contains an abstract class CompactionPicker, and its two
 // sub-classes LevelCompactionPicker and NullCompactionPicker, as
@@ -310,4 +310,4 @@ CompressionOptions GetCompressionOptions(const ImmutableCFOptions& ioptions,
                                         int level,
                                         const bool enable_compression = true);

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -17,7 +17,7 @@
 #include "logging/log_buffer.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 namespace {
 uint64_t GetTotalFilesSize(const std::vector<FileMetaData*>& files) {
  uint64_t total_size = 0;
@@ -70,10 +70,9 @@ Compaction* FIFOCompactionPicker::PickTTLCompaction(
  // avoid underflow
  if (current_time > mutable_cf_options.ttl) {
    for (auto ritr = level_files.rbegin(); ritr != level_files.rend(); ++ritr) {
-      auto f = *ritr;
-      if (f->fd.table_reader != nullptr &&
-          f->fd.table_reader->GetTableProperties() != nullptr) {
-        auto creation_time =
+      FileMetaData* f = *ritr;
+      if (f->fd.table_reader && f->fd.table_reader->GetTableProperties()) {
+        uint64_t creation_time =
            f->fd.table_reader->GetTableProperties()->creation_time;
        if (creation_time == 0 ||
            creation_time >= (current_time - mutable_cf_options.ttl)) {
@@ -96,11 +95,14 @@ Compaction* FIFOCompactionPicker::PickTTLCompaction(
  }

  for (const auto& f : inputs[0].files) {
+    uint64_t creation_time = 0;
+    if (f && f->fd.table_reader && f->fd.table_reader->GetTableProperties()) {
+      creation_time = f->fd.table_reader->GetTableProperties()->creation_time;
+    }
    ROCKS_LOG_BUFFER(log_buffer,
                     "[%s] FIFO compaction: picking file %" PRIu64
                     " with creation time %" PRIu64 " for deletion",
-                     cf_name.c_str(), f->fd.GetNumber(),
-                     f->fd.table_reader->GetTableProperties()->creation_time);
+                     cf_name.c_str(), f->fd.GetNumber(), creation_time);
  }

  Compaction* c = new Compaction(
@@ -238,5 +240,5 @@ Compaction* FIFOCompactionPicker::CompactRange(
  return c;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
 #endif  // !ROCKSDB_LITE
@@ -12,7 +12,7 @@

 #include "db/compaction/compaction_picker.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 class FIFOCompactionPicker : public CompactionPicker {
 public:
  FIFOCompactionPicker(const ImmutableCFOptions& ioptions,
@@ -49,5 +49,5 @@ class FIFOCompactionPicker : public CompactionPicker {
                                 VersionStorageInfo* version,
                                 LogBuffer* log_buffer);
 };
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
 #endif  // !ROCKSDB_LITE
@@ -15,7 +15,7 @@
 #include "logging/log_buffer.h"
 #include "test_util/sync_point.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 bool LevelCompactionPicker::NeedsCompaction(
    const VersionStorageInfo* vstorage) const {
@@ -555,4 +555,4 @@ Compaction* LevelCompactionPicker::PickCompaction(
                                 log_buffer, mutable_cf_options, ioptions_);
  return builder.PickCompaction();
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -11,7 +11,7 @@

 #include "db/compaction/compaction_picker.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 // Picking compactions for leveled compaction. See wiki page
 // https://github.com/facebook/rocksdb/wiki/Leveled-Compaction
 // for description of Leveled compaction.
@@ -29,4 +29,4 @@ class LevelCompactionPicker : public CompactionPicker {
      const VersionStorageInfo* vstorage) const override;
 };

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -17,7 +17,7 @@
 #include "test_util/testutil.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class CountingLogger : public Logger {
 public:
@@ -95,7 +95,8 @@ class CompactionPickerTest : public testing::Test {
        InternalKey(smallest, smallest_seq, kTypeValue),
        InternalKey(largest, largest_seq, kTypeValue), smallest_seq,
        largest_seq, /* marked_for_compact */ false, kInvalidBlobFileNumber,
-        kUnknownOldestAncesterTime, kUnknownFileCreationTime);
+        kUnknownOldestAncesterTime, kUnknownFileCreationTime,
+        kUnknownFileChecksum, kUnknownFileChecksumFuncName);
    f->compensated_file_size =
        (compensated_file_size != 0) ? compensated_file_size : file_size;
    vstorage_->AddFile(level, f);
@@ -1732,7 +1733,7 @@ TEST_F(CompactionPickerTest, IntraL0ForEarliestSeqno) {
  ASSERT_EQ(0, compaction->output_level());
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -23,7 +23,7 @@
 #include "util/random.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 namespace {
 // A helper class that form universal compactions. The class is used by
 // UniversalCompactionPicker::PickCompaction().
@@ -1100,6 +1100,6 @@ Compaction* UniversalCompactionBuilder::PickPeriodicCompaction() {

  return c;
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // !ROCKSDB_LITE
@@ -12,7 +12,7 @@

 #include "db/compaction/compaction_picker.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 class UniversalCompactionPicker : public CompactionPicker {
 public:
  UniversalCompactionPicker(const ImmutableCFOptions& ioptions,
@@ -27,5 +27,5 @@ class UniversalCompactionPicker : public CompactionPicker {
  virtual bool NeedsCompaction(
      const VersionStorageInfo* vstorage) const override;
 };
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
 #endif  // !ROCKSDB_LITE
@@ -18,10 +18,10 @@

 using std::unique_ptr;

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 namespace {

-static const Comparator* comparator;
+static const Comparator* kTestComparator = nullptr;

 class KVIter : public Iterator {
 public:
@@ -74,7 +74,7 @@ void AssertItersEqual(Iterator* iter1, Iterator* iter2) {
 void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
                            Random* rnd, int num_writes, int num_iter_ops,
                            int num_trigger_flush) {
-  stl_wrappers::KVMap map((stl_wrappers::LessOfComparator(comparator)));
+  stl_wrappers::KVMap map((stl_wrappers::LessOfComparator(kTestComparator)));

  for (int i = 0; i < num_writes; i++) {
    if (num_trigger_flush > 0 && i != 0 && i % num_trigger_flush == 0) {
@@ -263,19 +263,19 @@ class ComparatorDBTest

 public:
  ComparatorDBTest() : env_(Env::Default()), db_(nullptr) {
-    comparator = BytewiseComparator();
+    kTestComparator = BytewiseComparator();
    dbname_ = test::PerThreadDBPath("comparator_db_test");
    BlockBasedTableOptions toptions;
    toptions.format_version = GetParam();
    last_options_.table_factory.reset(
-        rocksdb::NewBlockBasedTableFactory(toptions));
+        ROCKSDB_NAMESPACE::NewBlockBasedTableFactory(toptions));
    EXPECT_OK(DestroyDB(dbname_, last_options_));
  }

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

  DB* GetDB() { return db_; }
@@ -286,7 +286,7 @@ class ComparatorDBTest
    } else {
      comparator_guard.reset();
    }
-    comparator = cmp;
+    kTestComparator = cmp;
    last_options_.comparator = cmp;
  }

@@ -334,7 +334,7 @@ TEST_P(ComparatorDBTest, SimpleSuffixReverseComparator) {

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
    Options* opt = GetOptions();
-    opt->comparator = comparator;
+    opt->comparator = kTestComparator;
    DestroyAndReopen();
    Random rnd(rnd_seed);

@@ -360,7 +360,7 @@ TEST_P(ComparatorDBTest, Uint64Comparator) {

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
    Options* opt = GetOptions();
-    opt->comparator = comparator;
+    opt->comparator = kTestComparator;
    DestroyAndReopen();
    Random rnd(rnd_seed);
    Random64 rnd64(rnd_seed);
@@ -384,7 +384,7 @@ TEST_P(ComparatorDBTest, DoubleComparator) {

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
    Options* opt = GetOptions();
-    opt->comparator = comparator;
+    opt->comparator = kTestComparator;
    DestroyAndReopen();
    Random rnd(rnd_seed);

@@ -409,7 +409,7 @@ TEST_P(ComparatorDBTest, HashComparator) {

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
    Options* opt = GetOptions();
-    opt->comparator = comparator;
+    opt->comparator = kTestComparator;
    DestroyAndReopen();
    Random rnd(rnd_seed);

@@ -428,7 +428,7 @@ TEST_P(ComparatorDBTest, TwoStrComparator) {

  for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
    Options* opt = GetOptions();
-    opt->comparator = comparator;
+    opt->comparator = kTestComparator;
    DestroyAndReopen();
    Random rnd(rnd_seed);

@@ -652,7 +652,7 @@ TEST_P(ComparatorDBTest, SeparatorSuccessorRandomizeTest) {
  }
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -11,7 +11,7 @@
 #include "db/db_impl/db_impl.h"
 #include "util/cast_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 void CancelAllBackgroundWork(DB* db, bool wait) {
  (static_cast_with_check<DBImpl, DB>(db->GetRootDB()))
@@ -72,6 +72,6 @@ Status VerifySstFileChecksum(const Options& options,
  return s;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // ROCKSDB_LITE
@@ -33,7 +33,7 @@
 #include "test_util/testutil.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 static const int kValueSize = 1000;

@@ -98,7 +98,7 @@ class CorruptionTest : public testing::Test {
  void RepairDB() {
    delete db_;
    db_ = nullptr;
-    ASSERT_OK(::rocksdb::RepairDB(dbname_, options_));
+    ASSERT_OK(::ROCKSDB_NAMESPACE::RepairDB(dbname_, options_));
  }

  void Build(int n, int flush_every = 0) {
@@ -393,12 +393,16 @@ TEST_F(CorruptionTest, TableFileIndexData) {

  // corrupt an index block of an entire file
  Corrupt(kTableFile, -2000, 500);
-  Reopen();
+  options.paranoid_checks = false;
+  Reopen(&options);
  dbi = reinterpret_cast<DBImpl*>(db_);
  // one full file may be readable, since only one was corrupted
  // the other file should be fully non-readable, since index was corrupted
  Check(0, 5000);
  ASSERT_NOK(dbi->VerifyChecksum());
+
+  // In paranoid mode, the db cannot be opened due to the corrupted file.
+  ASSERT_TRUE(TryReopen().IsCorruption());
 }

 TEST_F(CorruptionTest, MissingDescriptor) {
@@ -554,13 +558,7 @@ TEST_F(CorruptionTest, RangeDeletionCorrupted) {

  ASSERT_OK(TryReopen());
  CorruptFile(filename, static_cast<int>(range_del_handle.offset()), 1);
-  // The test case does not fail on TryReopen because failure to preload table
-  // handlers is not considered critical.
-  ASSERT_OK(TryReopen());
-  std::string val;
-  // However, it does fail on any read involving that file since that file
-  // cannot be opened with a corrupt range deletion meta-block.
-  ASSERT_TRUE(db_->Get(ReadOptions(), "a", &val).IsCorruption());
+  ASSERT_TRUE(TryReopen().IsCorruption());
 }

 TEST_F(CorruptionTest, FileSystemStateCorrupted) {
@@ -585,18 +583,19 @@ TEST_F(CorruptionTest, FileSystemStateCorrupted) {
      env_.NewWritableFile(filename, &file, EnvOptions());
      file->Append(Slice("corrupted sst"));
      file.reset();
+      Status x = TryReopen(&options);
+      ASSERT_TRUE(x.IsCorruption());
    } else {  // delete the file
      env_.DeleteFile(filename);
+      Status x = TryReopen(&options);
+      ASSERT_TRUE(x.IsPathNotFound());
    }

-    Status x = TryReopen(&options);
-    ASSERT_TRUE(x.IsCorruption());
    DestroyDB(dbname_, options_);
-    Reopen(&options);
  }
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -15,7 +15,7 @@
 #include "test_util/testutil.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class CuckooTableDBTest : public testing::Test {
 private:
@@ -298,17 +298,25 @@ TEST_F(CuckooTableDBTest, AdaptiveTable) {
  dbfull()->TEST_FlushMemTable();

  // Write some keys using plain table.
+  std::shared_ptr<TableFactory> block_based_factory(
+      NewBlockBasedTableFactory());
+  std::shared_ptr<TableFactory> plain_table_factory(
+      NewPlainTableFactory());
+  std::shared_ptr<TableFactory> cuckoo_table_factory(
+      NewCuckooTableFactory());
  options.create_if_missing = false;
-  options.table_factory.reset(NewPlainTableFactory());
+  options.table_factory.reset(NewAdaptiveTableFactory(
+    plain_table_factory, block_based_factory, plain_table_factory,
+    cuckoo_table_factory));
  Reopen(&options);
  ASSERT_OK(Put("key4", "v4"));
  ASSERT_OK(Put("key1", "v5"));
  dbfull()->TEST_FlushMemTable();

  // Write some keys using block based table.
-  std::shared_ptr<TableFactory> block_based_factory(
-      NewBlockBasedTableFactory());
-  options.table_factory.reset(NewAdaptiveTableFactory(block_based_factory));
+  options.table_factory.reset(NewAdaptiveTableFactory(
+    block_based_factory, block_based_factory, plain_table_factory,
+    cuckoo_table_factory));
  Reopen(&options);
  ASSERT_OK(Put("key5", "v6"));
  ASSERT_OK(Put("key2", "v7"));
@@ -320,14 +328,13 @@ TEST_F(CuckooTableDBTest, AdaptiveTable) {
  ASSERT_EQ("v4", Get("key4"));
  ASSERT_EQ("v6", Get("key5"));
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  if (rocksdb::port::kLittleEndian) {
+  if (ROCKSDB_NAMESPACE::port::kLittleEndian) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
-  }
-  else {
+  } else {
    fprintf(stderr, "SKIPPED as Cuckoo table doesn't support Big Endian\n");
    return 0;
  }
@@ -17,7 +17,7 @@
 #include "test_util/sync_point.h"
 #endif

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBBasicTest : public DBTestBase {
 public:
@@ -27,8 +27,8 @@ class DBBasicTest : public DBTestBase {
 TEST_F(DBBasicTest, OpenWhenOpen) {
  Options options = CurrentOptions();
  options.env = env_;
-  rocksdb::DB* db2 = nullptr;
-  rocksdb::Status s = DB::Open(options, dbname_, &db2);
+  ROCKSDB_NAMESPACE::DB* db2 = nullptr;
+  ROCKSDB_NAMESPACE::Status s = DB::Open(options, dbname_, &db2);

  ASSERT_EQ(Status::Code::kIOError, s.code());
  ASSERT_EQ(Status::SubCode::kNone, s.subcode());
@@ -1048,8 +1048,8 @@ TEST_P(DBMultiGetTestWithParam, MultiGetMultiCF) {
  }

  int get_sv_count = 0;
-  rocksdb::DBImpl* db = reinterpret_cast<DBImpl*>(db_);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::DBImpl* db = reinterpret_cast<DBImpl*>(db_);
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::MultiGet::AfterRefSV", [&](void* /*arg*/) {
        if (++get_sv_count == 2) {
          // After MultiGet refs a couple of CFs, flush all CFs so MultiGet
@@ -1073,7 +1073,7 @@ TEST_P(DBMultiGetTestWithParam, MultiGetMultiCF) {
          }
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  std::vector<int> cfs;
  std::vector<std::string> keys;
@@ -1139,12 +1139,12 @@ TEST_P(DBMultiGetTestWithParam, MultiGetMultiCFMutex) {
  int get_sv_count = 0;
  int retries = 0;
  bool last_try = false;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::MultiGet::LastTry", [&](void* /*arg*/) {
        last_try = true;
-        rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+        ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::MultiGet::AfterRefSV", [&](void* /*arg*/) {
        if (last_try) {
          return;
@@ -1160,7 +1160,7 @@ TEST_P(DBMultiGetTestWithParam, MultiGetMultiCFMutex) {
          }
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  std::vector<int> cfs;
  std::vector<std::string> keys;
@@ -1198,8 +1198,8 @@ TEST_P(DBMultiGetTestWithParam, MultiGetMultiCFSnapshot) {
  }

  int get_sv_count = 0;
-  rocksdb::DBImpl* db = reinterpret_cast<DBImpl*>(db_);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::DBImpl* db = reinterpret_cast<DBImpl*>(db_);
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::MultiGet::AfterRefSV", [&](void* /*arg*/) {
        if (++get_sv_count == 2) {
          for (int i = 0; i < 8; ++i) {
@@ -1219,7 +1219,7 @@ TEST_P(DBMultiGetTestWithParam, MultiGetMultiCFSnapshot) {
          }
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  std::vector<int> cfs;
  std::vector<std::string> keys;
@@ -1405,6 +1405,91 @@ TEST_F(DBBasicTest, MultiGetBatchedMultiLevel) {
  }
 }

+TEST_F(DBBasicTest, MultiGetBatchedMultiLevelMerge) {
+  Options options = CurrentOptions();
+  options.disable_auto_compactions = true;
+  options.merge_operator = MergeOperators::CreateStringAppendOperator();
+  BlockBasedTableOptions bbto;
+  bbto.filter_policy.reset(NewBloomFilterPolicy(10, false));
+  options.table_factory.reset(NewBlockBasedTableFactory(bbto));
+  Reopen(options);
+  int num_keys = 0;
+
+  for (int i = 0; i < 128; ++i) {
+    ASSERT_OK(Put("key_" + std::to_string(i), "val_l2_" + std::to_string(i)));
+    num_keys++;
+    if (num_keys == 8) {
+      Flush();
+      num_keys = 0;
+    }
+  }
+  if (num_keys > 0) {
+    Flush();
+    num_keys = 0;
+  }
+  MoveFilesToLevel(2);
+
+  for (int i = 0; i < 128; i += 3) {
+    ASSERT_OK(Merge("key_" + std::to_string(i), "val_l1_" + std::to_string(i)));
+    num_keys++;
+    if (num_keys == 8) {
+      Flush();
+      num_keys = 0;
+    }
+  }
+  if (num_keys > 0) {
+    Flush();
+    num_keys = 0;
+  }
+  MoveFilesToLevel(1);
+
+  for (int i = 0; i < 128; i += 5) {
+    ASSERT_OK(Merge("key_" + std::to_string(i), "val_l0_" + std::to_string(i)));
+    num_keys++;
+    if (num_keys == 8) {
+      Flush();
+      num_keys = 0;
+    }
+  }
+  if (num_keys > 0) {
+    Flush();
+    num_keys = 0;
+  }
+  ASSERT_EQ(0, num_keys);
+
+  for (int i = 0; i < 128; i += 9) {
+    ASSERT_OK(Merge("key_" + std::to_string(i), "val_mem_" + std::to_string(i)));
+  }
+
+  std::vector<std::string> keys;
+  std::vector<std::string> values;
+
+  for (int i = 32; i < 80; ++i) {
+    keys.push_back("key_" + std::to_string(i));
+  }
+
+  values = MultiGet(keys, nullptr);
+  ASSERT_EQ(values.size(), keys.size());
+  for (unsigned int j = 0; j < 48; ++j) {
+    int key = j + 32;
+    std::string value;
+    value.append("val_l2_" + std::to_string(key));
+    if (key % 3 == 0) {
+      value.append(",");
+      value.append("val_l1_" + std::to_string(key));
+    }
+    if (key % 5 == 0) {
+      value.append(",");
+      value.append("val_l0_" + std::to_string(key));
+    }
+    if (key % 9 == 0) {
+      value.append(",");
+      value.append("val_mem_" + std::to_string(key));
+    }
+    ASSERT_EQ(values[j], value);
+  }
+}
+
 // Test class for batched MultiGet with prefix extractor
 // Param bool - If true, use partitioned filters
 //              If false, use full filter block
@@ -1473,7 +1558,7 @@ TEST_P(DBMultiGetRowCacheTest, MultiGetBatched) {
  do {
    option_config_ = kRowCache;
    Options options = CurrentOptions();
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    CreateAndReopenWithCF({"pikachu"}, options);
    SetPerfLevel(kEnableCount);
    ASSERT_OK(Put(1, "k1", "v1"));
@@ -1579,13 +1664,13 @@ TEST_F(DBBasicTest, GetAllKeyVersions) {
    ASSERT_OK(Delete(std::to_string(i)));
  }
  std::vector<KeyVersion> key_versions;
-  ASSERT_OK(rocksdb::GetAllKeyVersions(db_, Slice(), Slice(),
-                                       std::numeric_limits<size_t>::max(),
-                                       &key_versions));
+  ASSERT_OK(ROCKSDB_NAMESPACE::GetAllKeyVersions(
+      db_, Slice(), Slice(), std::numeric_limits<size_t>::max(),
+      &key_versions));
  ASSERT_EQ(kNumInserts + kNumDeletes + kNumUpdates, key_versions.size());
-  ASSERT_OK(rocksdb::GetAllKeyVersions(db_, handles_[0], Slice(), Slice(),
-                                       std::numeric_limits<size_t>::max(),
-                                       &key_versions));
+  ASSERT_OK(ROCKSDB_NAMESPACE::GetAllKeyVersions(
+      db_, handles_[0], Slice(), Slice(), std::numeric_limits<size_t>::max(),
+      &key_versions));
  ASSERT_EQ(kNumInserts + kNumDeletes + kNumUpdates, key_versions.size());

  // Check non-default column family
@@ -1598,9 +1683,9 @@ TEST_F(DBBasicTest, GetAllKeyVersions) {
  for (size_t i = 0; i != kNumDeletes - 1; ++i) {
    ASSERT_OK(Delete(1, std::to_string(i)));
  }
-  ASSERT_OK(rocksdb::GetAllKeyVersions(db_, handles_[1], Slice(), Slice(),
-                                       std::numeric_limits<size_t>::max(),
-                                       &key_versions));
+  ASSERT_OK(ROCKSDB_NAMESPACE::GetAllKeyVersions(
+      db_, handles_[1], Slice(), Slice(), std::numeric_limits<size_t>::max(),
+      &key_versions));
  ASSERT_EQ(kNumInserts + kNumDeletes + kNumUpdates - 3, key_versions.size());
 }
 #endif  // !ROCKSDB_LITE
@@ -2011,6 +2096,90 @@ TEST_P(DBBasicTestWithParallelIO, MultiGet) {
  }
 }

+TEST_P(DBBasicTestWithParallelIO, MultiGetWithChecksumMismatch) {
+  std::vector<std::string> key_data(10);
+  std::vector<Slice> keys;
+  // We cannot resize a PinnableSlice vector, so just set initial size to
+  // largest we think we will need
+  std::vector<PinnableSlice> values(10);
+  std::vector<Status> statuses;
+  int read_count = 0;
+  ReadOptions ro;
+  ro.fill_cache = fill_cache();
+
+  SyncPoint::GetInstance()->SetCallBack(
+      "RetrieveMultipleBlocks:VerifyChecksum", [&](void *status) {
+      Status* s = static_cast<Status*>(status);
+      read_count++;
+      if (read_count == 2) {
+        *s = Status::Corruption();
+      }
+    });
+  SyncPoint::GetInstance()->EnableProcessing();
+
+  // Warm up the cache first
+  key_data.emplace_back(Key(0));
+  keys.emplace_back(Slice(key_data.back()));
+  key_data.emplace_back(Key(50));
+  keys.emplace_back(Slice(key_data.back()));
+  statuses.resize(keys.size());
+
+  dbfull()->MultiGet(ro, dbfull()->DefaultColumnFamily(), keys.size(),
+                     keys.data(), values.data(), statuses.data(), true);
+  ASSERT_TRUE(CheckValue(0, values[0].ToString()));
+  //ASSERT_TRUE(CheckValue(50, values[1].ToString()));
+  ASSERT_EQ(statuses[0], Status::OK());
+  ASSERT_EQ(statuses[1], Status::Corruption());
+
+  SyncPoint::GetInstance()->DisableProcessing();
+}
+
+TEST_P(DBBasicTestWithParallelIO, MultiGetWithMissingFile) {
+  std::vector<std::string> key_data(10);
+  std::vector<Slice> keys;
+  // We cannot resize a PinnableSlice vector, so just set initial size to
+  // largest we think we will need
+  std::vector<PinnableSlice> values(10);
+  std::vector<Status> statuses;
+  ReadOptions ro;
+  ro.fill_cache = fill_cache();
+
+  SyncPoint::GetInstance()->SetCallBack(
+      "TableCache::MultiGet:FindTable", [&](void *status) {
+      Status* s = static_cast<Status*>(status);
+      *s = Status::IOError();
+    });
+  // DB open will create table readers unless we reduce the table cache
+  // capacity.
+  // SanitizeOptions will set max_open_files to minimum of 20. Table cache
+  // is allocated with max_open_files - 10 as capacity. So override
+  // max_open_files to 11 so table cache capacity will become 1. This will
+  // prevent file open during DB open and force the file to be opened
+  // during MultiGet
+  SyncPoint::GetInstance()->SetCallBack(
+      "SanitizeOptions::AfterChangeMaxOpenFiles", [&](void *arg) {
+      int* max_open_files = (int*)arg;
+      *max_open_files = 11;
+    });
+  SyncPoint::GetInstance()->EnableProcessing();
+
+  Reopen(CurrentOptions());
+
+  // Warm up the cache first
+  key_data.emplace_back(Key(0));
+  keys.emplace_back(Slice(key_data.back()));
+  key_data.emplace_back(Key(50));
+  keys.emplace_back(Slice(key_data.back()));
+  statuses.resize(keys.size());
+
+  dbfull()->MultiGet(ro, dbfull()->DefaultColumnFamily(), keys.size(),
+                     keys.data(), values.data(), statuses.data(), true);
+  ASSERT_EQ(statuses[0], Status::IOError());
+  ASSERT_EQ(statuses[1], Status::IOError());
+
+  SyncPoint::GetInstance()->DisableProcessing();
+}
+
 INSTANTIATE_TEST_CASE_P(
    ParallelIO, DBBasicTestWithParallelIO,
    // Params are as follows -
@@ -2021,23 +2190,15 @@ INSTANTIATE_TEST_CASE_P(
    ::testing::Combine(::testing::Bool(), ::testing::Bool(),
                       ::testing::Bool(), ::testing::Bool()));

-class DBBasicTestWithTimestampWithParam
-    : public DBTestBase,
-      public testing::WithParamInterface<bool> {
+class DBBasicTestWithTimestampBase : public DBTestBase {
 public:
-  DBBasicTestWithTimestampWithParam()
-      : DBTestBase("/db_basic_test_with_timestamp") {}
+  explicit DBBasicTestWithTimestampBase(const std::string& dbname)
+      : DBTestBase(dbname) {}

 protected:
-  class TestComparator : public Comparator {
-   private:
-    const Comparator* cmp_without_ts_;
-
+  class TestComparatorBase : public Comparator {
   public:
-    explicit TestComparator(size_t ts_sz)
-        : Comparator(ts_sz), cmp_without_ts_(nullptr) {
-      cmp_without_ts_ = BytewiseComparator();
-    }
+    explicit TestComparatorBase(size_t ts_sz) : Comparator(ts_sz) {}

    const char* Name() const override { return "TestComparator"; }

@@ -2055,13 +2216,15 @@ class DBBasicTestWithTimestampWithParam
          Slice(b.data() + b.size() - timestamp_size(), timestamp_size()));
    }

+    virtual int CompareImpl(const Slice& a, const Slice& b) const = 0;
+
    int CompareWithoutTimestamp(const Slice& a, const Slice& b) const override {
      assert(a.size() >= timestamp_size());
      assert(b.size() >= timestamp_size());
      Slice k1 = StripTimestampFromUserKey(a, timestamp_size());
      Slice k2 = StripTimestampFromUserKey(b, timestamp_size());

-      return cmp_without_ts_->Compare(k1, k2);
+      return CompareImpl(k1, k2);
    }

    int CompareTimestamp(const Slice& ts1, const Slice& ts2) const override {
@@ -2107,6 +2270,166 @@ class DBBasicTestWithTimestampWithParam
  }
 };

+class DBBasicTestWithTimestamp : public DBBasicTestWithTimestampBase {
+ public:
+  DBBasicTestWithTimestamp()
+      : DBBasicTestWithTimestampBase("/db_basic_test_with_timestamp") {}
+
+ protected:
+  class TestComparator : public TestComparatorBase {
+   public:
+    const int kKeyPrefixLength =
+        3;  // 3: length of "key" in generated keys ("key" + std::to_string(j))
+    explicit TestComparator(size_t ts_sz) : TestComparatorBase(ts_sz) {}
+
+    int CompareImpl(const Slice& a, const Slice& b) const override {
+      int n1 = atoi(
+          std::string(a.data() + kKeyPrefixLength, a.size() - kKeyPrefixLength)
+              .c_str());
+      int n2 = atoi(
+          std::string(b.data() + kKeyPrefixLength, b.size() - kKeyPrefixLength)
+              .c_str());
+      return (n1 < n2) ? -1 : (n1 > n2) ? 1 : 0;
+    }
+  };
+};
+
+#ifndef ROCKSDB_LITE
+// A class which remembers the name of each flushed file.
+class FlushedFileCollector : public EventListener {
+ public:
+  FlushedFileCollector() {}
+  ~FlushedFileCollector() override {}
+
+  void OnFlushCompleted(DB* /*db*/, const FlushJobInfo& info) override {
+    InstrumentedMutexLock lock(&mutex_);
+    flushed_files_.push_back(info.file_path);
+  }
+
+  std::vector<std::string> GetFlushedFiles() {
+    std::vector<std::string> result;
+    {
+      InstrumentedMutexLock lock(&mutex_);
+      result = flushed_files_;
+    }
+    return result;
+  }
+
+  void ClearFlushedFiles() {
+    InstrumentedMutexLock lock(&mutex_);
+    flushed_files_.clear();
+  }
+
+ private:
+  std::vector<std::string> flushed_files_;
+  InstrumentedMutex mutex_;
+};
+
+TEST_F(DBBasicTestWithTimestamp, PutAndGetWithCompaction) {
+  const int kNumKeysPerFile = 8192;
+  const size_t kNumTimestamps = 2;
+  const size_t kNumKeysPerTimestamp = (kNumKeysPerFile - 1) / kNumTimestamps;
+  const size_t kSplitPosBase = kNumKeysPerTimestamp / 2;
+  Options options = CurrentOptions();
+  options.create_if_missing = true;
+  options.env = env_;
+  options.memtable_factory.reset(new SpecialSkipListFactory(kNumKeysPerFile));
+
+  FlushedFileCollector* collector = new FlushedFileCollector();
+  options.listeners.emplace_back(collector);
+
+  std::string tmp;
+  size_t ts_sz = EncodeTimestamp(0, 0, &tmp).size();
+  TestComparator test_cmp(ts_sz);
+  options.comparator = &test_cmp;
+  BlockBasedTableOptions bbto;
+  bbto.filter_policy.reset(NewBloomFilterPolicy(
+      10 /*bits_per_key*/, false /*use_block_based_builder*/));
+  bbto.whole_key_filtering = true;
+  options.table_factory.reset(NewBlockBasedTableFactory(bbto));
+  DestroyAndReopen(options);
+  CreateAndReopenWithCF({"pikachu"}, options);
+  size_t num_cfs = handles_.size();
+  ASSERT_EQ(2, num_cfs);
+  std::vector<std::string> write_ts_strs(kNumTimestamps);
+  std::vector<std::string> read_ts_strs(kNumTimestamps);
+  std::vector<Slice> write_ts_list;
+  std::vector<Slice> read_ts_list;
+
+  for (size_t i = 0; i != kNumTimestamps; ++i) {
+    write_ts_list.emplace_back(EncodeTimestamp(i * 2, 0, &write_ts_strs[i]));
+    read_ts_list.emplace_back(EncodeTimestamp(1 + i * 2, 0, &read_ts_strs[i]));
+    const Slice& write_ts = write_ts_list.back();
+    WriteOptions wopts;
+    wopts.timestamp = &write_ts;
+    for (int cf = 0; cf != static_cast<int>(num_cfs); ++cf) {
+      for (size_t j = 0; j != kNumKeysPerTimestamp; ++j) {
+        ASSERT_OK(Put(cf, "key" + std::to_string(j),
+                      "value_" + std::to_string(j) + "_" + std::to_string(i),
+                      wopts));
+        if (j == kSplitPosBase + i || j == kNumKeysPerTimestamp - 1) {
+          // flush all keys with the same timestamp to two sst files, split at
+          // incremental positions such that lowerlevel[1].smallest.userkey ==
+          // higherlevel[0].largest.userkey
+          ASSERT_OK(Flush(cf));
+
+          // compact files (2 at each level) to a lower level such that all keys
+          // with the same timestamp is at one level, with newer versions at
+          // higher levels.
+          CompactionOptions compact_opt;
+          compact_opt.compression = kNoCompression;
+          db_->CompactFiles(compact_opt, handles_[cf],
+                            collector->GetFlushedFiles(),
+                            static_cast<int>(kNumTimestamps - i));
+          collector->ClearFlushedFiles();
+        }
+      }
+    }
+  }
+  const auto& verify_db_func = [&]() {
+    for (size_t i = 0; i != kNumTimestamps; ++i) {
+      ReadOptions ropts;
+      ropts.timestamp = &read_ts_list[i];
+      for (int cf = 0; cf != static_cast<int>(num_cfs); ++cf) {
+        ColumnFamilyHandle* cfh = handles_[cf];
+        for (size_t j = 0; j != kNumKeysPerTimestamp; ++j) {
+          std::string value;
+          ASSERT_OK(db_->Get(ropts, cfh, "key" + std::to_string(j), &value));
+          ASSERT_EQ("value_" + std::to_string(j) + "_" + std::to_string(i),
+                    value);
+        }
+      }
+    }
+  };
+  verify_db_func();
+}
+#endif  // !ROCKSDB_LITE
+
+class DBBasicTestWithTimestampWithParam
+    : public DBBasicTestWithTimestampBase,
+      public testing::WithParamInterface<bool> {
+ public:
+  DBBasicTestWithTimestampWithParam()
+      : DBBasicTestWithTimestampBase(
+            "/db_basic_test_with_timestamp_with_param") {}
+
+ protected:
+  class TestComparator : public TestComparatorBase {
+   private:
+    const Comparator* cmp_without_ts_;
+
+   public:
+    explicit TestComparator(size_t ts_sz)
+        : TestComparatorBase(ts_sz), cmp_without_ts_(nullptr) {
+      cmp_without_ts_ = BytewiseComparator();
+    }
+
+    int CompareImpl(const Slice& a, const Slice& b) const override {
+      return cmp_without_ts_->Compare(a, b);
+    }
+  };
+};
+
 TEST_P(DBBasicTestWithTimestampWithParam, PutAndGet) {
  const int kNumKeysPerFile = 8192;
  const size_t kNumTimestamps = 6;
@@ -2204,7 +2527,7 @@ TEST_P(DBBasicTestWithTimestampWithParam, PutAndGet) {
 INSTANTIATE_TEST_CASE_P(Timestamp, DBBasicTestWithTimestampWithParam,
                        ::testing::Bool());

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #ifdef ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS
 extern "C" {
@@ -2215,7 +2538,7 @@ void RegisterCustomObjects(int /*argc*/, char** /*argv*/) {}
 #endif  // !ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  RegisterCustomObjects(argc, argv);
  return RUN_ALL_TESTS();
@@ -23,7 +23,7 @@
 #include "util/string_util.h"
 #include "utilities/merge_operators.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // kTypeBlobIndex is a value type used by BlobDB only. The base rocksdb
 // should accept the value type on write, and report not supported value
@@ -427,10 +427,10 @@ TEST_F(DBBlobIndexTest, Iterate) {
  }
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -12,7 +12,7 @@
 #include "port/stack_trace.h"
 #include "util/compression.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBBlockCacheTest : public DBTestBase {
 private:
@@ -46,7 +46,7 @@ class DBBlockCacheTest : public DBTestBase {
    options.create_if_missing = true;
    options.avoid_flush_during_recovery = false;
    // options.compression = kNoCompression;
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    options.table_factory.reset(new BlockBasedTableFactory(table_options));
    return options;
  }
@@ -292,7 +292,7 @@ TEST_F(DBBlockCacheTest, TestWithCompressedBlockCache) {
 TEST_F(DBBlockCacheTest, IndexAndFilterBlocksOfNewTableAddedToCache) {
  Options options = CurrentOptions();
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  BlockBasedTableOptions table_options;
  table_options.cache_index_and_filter_blocks = true;
  table_options.filter_policy.reset(NewBloomFilterPolicy(20));
@@ -378,7 +378,7 @@ TEST_F(DBBlockCacheTest, FillCacheAndIterateDB) {
 TEST_F(DBBlockCacheTest, IndexAndFilterBlocksStats) {
  Options options = CurrentOptions();
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  BlockBasedTableOptions table_options;
  table_options.cache_index_and_filter_blocks = true;
  LRUCacheOptions co;
@@ -464,7 +464,7 @@ TEST_F(DBBlockCacheTest, IndexAndFilterBlocksCachePriority) {
  for (auto priority : {Cache::Priority::LOW, Cache::Priority::HIGH}) {
    Options options = CurrentOptions();
    options.create_if_missing = true;
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    BlockBasedTableOptions table_options;
    table_options.cache_index_and_filter_blocks = true;
    table_options.block_cache.reset(new MockCache());
@@ -520,7 +520,7 @@ TEST_F(DBBlockCacheTest, IndexAndFilterBlocksCachePriority) {
 TEST_F(DBBlockCacheTest, ParanoidFileChecks) {
  Options options = CurrentOptions();
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.level0_file_num_compaction_trigger = 2;
  options.paranoid_file_checks = true;
  BlockBasedTableOptions table_options;
@@ -576,7 +576,7 @@ TEST_F(DBBlockCacheTest, CompressedCache) {
  for (int iter = 0; iter < 4; iter++) {
    Options options = CurrentOptions();
    options.write_buffer_size = 64 * 1024;  // small write buffer
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();

    BlockBasedTableOptions table_options;
    switch (iter) {
@@ -705,7 +705,7 @@ TEST_F(DBBlockCacheTest, CacheCompressionDict) {
    options.compression_opts.max_dict_bytes = 4096;
    options.create_if_missing = true;
    options.num_levels = 2;
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    options.target_file_size_base = kNumEntriesPerFile * kNumBytesPerEntry;
    BlockBasedTableOptions table_options;
    table_options.cache_index_and_filter_blocks = true;
@@ -752,10 +752,10 @@ TEST_F(DBBlockCacheTest, CacheCompressionDict) {

 #endif  // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -12,16 +12,10 @@
 #include "rocksdb/perf_context.h"
 #include "table/block_based/filter_policy_internal.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 namespace {
 using BFP = BloomFilterPolicy;
-
-namespace BFP2 {
-// Extends BFP::Mode with option to use Plain table
-using PseudoMode = int;
-static constexpr PseudoMode kPlainTable = -1;
-}  // namespace BFP2
 }  // namespace

 // DB tests related to bloom filter.
@@ -94,7 +88,7 @@ TEST_P(DBBloomFilterTestDefFormatVersion, KeyMayExist) {
      // indexes
      continue;
    }
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    CreateAndReopenWithCF({"pikachu"}, options);

    ASSERT_TRUE(!db_->KeyMayExist(ropts, handles_[1], "a", &value));
@@ -156,7 +150,7 @@ TEST_F(DBBloomFilterTest, GetFilterByPrefixBloomCustomPrefixExtractor) {
    Options options = last_options_;
    options.prefix_extractor =
        std::make_shared<SliceTransformLimitedDomainGeneric>();
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    get_perf_context()->EnablePerLevelPerfContext();
    BlockBasedTableOptions bbto;
    bbto.filter_policy.reset(NewBloomFilterPolicy(10, false));
@@ -222,7 +216,7 @@ TEST_F(DBBloomFilterTest, GetFilterByPrefixBloom) {
  for (bool partition_filters : {true, false}) {
    Options options = last_options_;
    options.prefix_extractor.reset(NewFixedPrefixTransform(8));
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    get_perf_context()->EnablePerLevelPerfContext();
    BlockBasedTableOptions bbto;
    bbto.filter_policy.reset(NewBloomFilterPolicy(10, false));
@@ -273,7 +267,7 @@ TEST_F(DBBloomFilterTest, WholeKeyFilterProp) {
  for (bool partition_filters : {true, false}) {
    Options options = last_options_;
    options.prefix_extractor.reset(NewFixedPrefixTransform(3));
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    get_perf_context()->EnablePerLevelPerfContext();

    BlockBasedTableOptions bbto;
@@ -537,7 +531,7 @@ INSTANTIATE_TEST_CASE_P(
 TEST_F(DBBloomFilterTest, BloomFilterRate) {
  while (ChangeFilterOptions()) {
    Options options = CurrentOptions();
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    get_perf_context()->EnablePerLevelPerfContext();
    CreateAndReopenWithCF({"pikachu"}, options);

@@ -569,7 +563,7 @@ TEST_F(DBBloomFilterTest, BloomFilterRate) {

 TEST_F(DBBloomFilterTest, BloomFilterCompatibility) {
  Options options = CurrentOptions();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  BlockBasedTableOptions table_options;
  table_options.filter_policy.reset(NewBloomFilterPolicy(10, true));
  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
@@ -613,7 +607,7 @@ TEST_F(DBBloomFilterTest, BloomFilterCompatibility) {
 TEST_F(DBBloomFilterTest, BloomFilterReverseCompatibility) {
  for (bool partition_filters : {true, false}) {
    Options options = CurrentOptions();
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    BlockBasedTableOptions table_options;
    if (partition_filters) {
      table_options.partition_filters = true;
@@ -660,17 +654,18 @@ class TestingWrappedBlockBasedFilterPolicy : public FilterPolicy {
    return "TestingWrappedBlockBasedFilterPolicy";
  }

-  void CreateFilter(const rocksdb::Slice* keys, int n,
+  void CreateFilter(const ROCKSDB_NAMESPACE::Slice* keys, int n,
                    std::string* dst) const override {
-    std::unique_ptr<rocksdb::Slice[]> user_keys(new rocksdb::Slice[n]);
+    std::unique_ptr<ROCKSDB_NAMESPACE::Slice[]> user_keys(
+        new ROCKSDB_NAMESPACE::Slice[n]);
    for (int i = 0; i < n; ++i) {
      user_keys[i] = convertKey(keys[i]);
    }
    return filter_->CreateFilter(user_keys.get(), n, dst);
  }

-  bool KeyMayMatch(const rocksdb::Slice& key,
-                   const rocksdb::Slice& filter) const override {
+  bool KeyMayMatch(const ROCKSDB_NAMESPACE::Slice& key,
+                   const ROCKSDB_NAMESPACE::Slice& filter) const override {
    counter_++;
    return filter_->KeyMayMatch(convertKey(key), filter);
  }
@@ -681,13 +676,16 @@ class TestingWrappedBlockBasedFilterPolicy : public FilterPolicy {
  const FilterPolicy* filter_;
  mutable uint32_t counter_;

-  rocksdb::Slice convertKey(const rocksdb::Slice& key) const { return key; }
+  ROCKSDB_NAMESPACE::Slice convertKey(
+      const ROCKSDB_NAMESPACE::Slice& key) const {
+    return key;
+  }
 };
 }  // namespace

 TEST_F(DBBloomFilterTest, WrappedBlockBasedFilterPolicy) {
  Options options = CurrentOptions();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();

  BlockBasedTableOptions table_options;
  TestingWrappedBlockBasedFilterPolicy* policy =
@@ -803,7 +801,7 @@ class TestingContextCustomFilterPolicy
 TEST_F(DBBloomFilterTest, ContextCustomFilterPolicy) {
  for (bool fifo : {true, false}) {
    Options options = CurrentOptions();
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    options.compaction_style =
        fifo ? kCompactionStyleFIFO : kCompactionStyleLevel;

@@ -902,7 +900,7 @@ class SliceTransformLimitedDomain : public SliceTransform {
 TEST_F(DBBloomFilterTest, PrefixExtractorFullFilter) {
  BlockBasedTableOptions bbto;
  // Full Filter Block
-  bbto.filter_policy.reset(rocksdb::NewBloomFilterPolicy(10, false));
+  bbto.filter_policy.reset(ROCKSDB_NAMESPACE::NewBloomFilterPolicy(10, false));
  bbto.whole_key_filtering = false;

  Options options = CurrentOptions();
@@ -931,7 +929,7 @@ TEST_F(DBBloomFilterTest, PrefixExtractorFullFilter) {
 TEST_F(DBBloomFilterTest, PrefixExtractorBlockFilter) {
  BlockBasedTableOptions bbto;
  // Block Filter Block
-  bbto.filter_policy.reset(rocksdb::NewBloomFilterPolicy(10, true));
+  bbto.filter_policy.reset(ROCKSDB_NAMESPACE::NewBloomFilterPolicy(10, true));

  Options options = CurrentOptions();
  options.prefix_extractor = std::make_shared<SliceTransformLimitedDomain>();
@@ -970,7 +968,8 @@ TEST_F(DBBloomFilterTest, MemtableWholeKeyBloomFilter) {
  Options options = CurrentOptions();
  options.memtable_prefix_bloom_size_ratio =
      static_cast<double>(kMemtablePrefixFilterSize) / kMemtableSize;
-  options.prefix_extractor.reset(rocksdb::NewFixedPrefixTransform(kPrefixLen));
+  options.prefix_extractor.reset(
+      ROCKSDB_NAMESPACE::NewFixedPrefixTransform(kPrefixLen));
  options.write_buffer_size = kMemtableSize;
  options.memtable_whole_key_filtering = false;
  Reopen(options);
@@ -1031,6 +1030,14 @@ TEST_F(DBBloomFilterTest, MemtablePrefixBloomOutOfDomain) {
 }

 #ifndef ROCKSDB_LITE
+namespace {
+namespace BFP2 {
+// Extends BFP::Mode with option to use Plain table
+using PseudoMode = int;
+static constexpr PseudoMode kPlainTable = -1;
+}  // namespace BFP2
+}  // namespace
+
 class BloomStatsTestWithParam
    : public DBBloomFilterTest,
      public testing::WithParamInterface<std::tuple<BFP2::PseudoMode, bool>> {
@@ -1040,7 +1047,8 @@ class BloomStatsTestWithParam
    partition_filters_ = std::get<1>(GetParam());

    options_.create_if_missing = true;
-    options_.prefix_extractor.reset(rocksdb::NewFixedPrefixTransform(4));
+    options_.prefix_extractor.reset(
+        ROCKSDB_NAMESPACE::NewFixedPrefixTransform(4));
    options_.memtable_prefix_bloom_size_ratio =
        8.0 * 1024.0 / static_cast<double>(options_.write_buffer_size);
    if (bfp_impl_ == BFP2::kPlainTable) {
@@ -1321,7 +1329,7 @@ TEST_F(DBBloomFilterTest, OptimizeFiltersForHits) {
  bbto.whole_key_filtering = true;
  options.table_factory.reset(NewBlockBasedTableFactory(bbto));
  options.optimize_filters_for_hits = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  get_perf_context()->Reset();
  get_perf_context()->EnablePerLevelPerfContext();
  CreateAndReopenWithCF({"mypikachu"}, options);
@@ -1447,13 +1455,13 @@ TEST_F(DBBloomFilterTest, OptimizeFiltersForHits) {

  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  CompactRangeOptions compact_options;
  compact_options.bottommost_level_compaction =
@@ -1893,10 +1901,10 @@ TEST_F(DBBloomFilterTest, DynamicBloomFilterOptions) {

 #endif  // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -10,7 +10,7 @@
 #include "db/db_test_util.h"
 #include "port/stack_trace.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 static int cfilter_count = 0;
 static int cfilter_skips = 0;
@@ -47,8 +47,7 @@ class DBTestCompactionFilterWithCompactParam

 #ifndef ROCKSDB_VALGRIND_RUN
 INSTANTIATE_TEST_CASE_P(
-    DBTestCompactionFilterWithCompactOption,
-    DBTestCompactionFilterWithCompactParam,
+    CompactionFilterWithOption, DBTestCompactionFilterWithCompactParam,
    ::testing::Values(DBTestBase::OptionConfig::kDefault,
                      DBTestBase::OptionConfig::kUniversalCompaction,
                      DBTestBase::OptionConfig::kUniversalCompactionMultiLevel,
@@ -56,7 +55,7 @@ INSTANTIATE_TEST_CASE_P(
                      DBTestBase::OptionConfig::kUniversalSubcompactions));
 #else
 // Run fewer cases in valgrind
-INSTANTIATE_TEST_CASE_P(DBTestCompactionFilterWithCompactOption,
+INSTANTIATE_TEST_CASE_P(CompactionFilterWithOption,
                        DBTestCompactionFilterWithCompactParam,
                        ::testing::Values(DBTestBase::OptionConfig::kDefault));
 #endif  // ROCKSDB_VALGRIND_RUN
@@ -864,10 +863,10 @@ TEST_F(DBTestCompactionFilter, IgnoreSnapshotsFalse) {
  delete options.compaction_filter;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -18,7 +18,7 @@
 #include "test_util/sync_point.h"
 #include "util/concurrent_task_limiter_impl.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // SYNC_POINT is not supported in released Windows mode.
 #if !defined(ROCKSDB_LITE)
@@ -400,6 +400,7 @@ TEST_F(DBCompactionTest, SkipStatsUpdateTest) {
  // The test will need to be updated if the internal behavior changes.

  Options options = DeletionTriggerOptions(CurrentOptions());
+  options.disable_auto_compactions = true;
  options.env = env_;
  DestroyAndReopen(options);
  Random rnd(301);
@@ -410,31 +411,33 @@ TEST_F(DBCompactionTest, SkipStatsUpdateTest) {
    values.push_back(RandomString(&rnd, kCDTValueSize));
    ASSERT_OK(Put(Key(k), values[k]));
  }
-  dbfull()->TEST_WaitForFlushMemTable();
-  dbfull()->TEST_WaitForCompact();
+
+  ASSERT_OK(Flush());
+
+  Close();
+
+  int update_acc_stats_called = 0;
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "VersionStorageInfo::UpdateAccumulatedStats",
+      [&](void* /* arg */) { ++update_acc_stats_called; });
+  SyncPoint::GetInstance()->EnableProcessing();

  // Reopen the DB with stats-update disabled
  options.skip_stats_update_on_db_open = true;
  options.max_open_files = 20;
-  env_->random_file_open_counter_.store(0);
  Reopen(options);

-  // As stats-update is disabled, we expect a very low number of
-  // random file open.
-  // Note that this number must be changed accordingly if we change
-  // the number of files needed to be opened in the DB::Open process.
-  const int kMaxFileOpenCount = 10;
-  ASSERT_LT(env_->random_file_open_counter_.load(), kMaxFileOpenCount);
+  ASSERT_EQ(update_acc_stats_called, 0);

  // Repeat the reopen process, but this time we enable
  // stats-update.
  options.skip_stats_update_on_db_open = false;
-  env_->random_file_open_counter_.store(0);
  Reopen(options);

-  // Since we do a normal stats update on db-open, there
-  // will be more random open files.
-  ASSERT_GT(env_->random_file_open_counter_.load(), kMaxFileOpenCount);
+  ASSERT_GT(update_acc_stats_called, 0);
+
+  SyncPoint::GetInstance()->ClearAllCallBacks();
+  SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBCompactionTest, TestTableReaderForCompaction) {
@@ -448,7 +451,7 @@ TEST_F(DBCompactionTest, TestTableReaderForCompaction) {

  int num_table_cache_lookup = 0;
  int num_new_table_reader = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "TableCache::FindTable:0", [&](void* arg) {
        assert(arg != nullptr);
        bool no_io = *(reinterpret_cast<bool*>(arg));
@@ -457,10 +460,10 @@ TEST_F(DBCompactionTest, TestTableReaderForCompaction) {
          num_table_cache_lookup++;
        }
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "TableCache::GetTableReader:0",
      [&](void* /*arg*/) { num_new_table_reader++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  for (int k = 0; k < options.level0_file_num_compaction_trigger; ++k) {
    ASSERT_OK(Put(Key(k), Key(k)));
@@ -530,7 +533,7 @@ TEST_F(DBCompactionTest, TestTableReaderForCompaction) {
  ASSERT_EQ(num_table_cache_lookup + old_num_table_cache_lookup2, 3);
  ASSERT_EQ(num_new_table_reader, 0);

-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
 }

 TEST_P(DBCompactionTestWithParam, CompactionDeletionTriggerReopen) {
@@ -1020,10 +1023,10 @@ TEST_F(DBCompactionTest, RecoverDuringMemtableCompaction) {

 TEST_P(DBCompactionTestWithParam, TrivialMoveOneFile) {
  int32_t trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
  options.write_buffer_size = 100000000;
@@ -1071,19 +1074,19 @@ TEST_P(DBCompactionTestWithParam, TrivialMoveOneFile) {
  }

  ASSERT_EQ(trivial_move, 1);
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_P(DBCompactionTestWithParam, TrivialMoveNonOverlappingFiles) {
  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
  options.disable_auto_compactions = true;
@@ -1170,19 +1173,19 @@ TEST_P(DBCompactionTestWithParam, TrivialMoveNonOverlappingFiles) {
  ASSERT_EQ(trivial_move, 0);
  ASSERT_EQ(non_trivial_move, 1);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_P(DBCompactionTestWithParam, TrivialMoveTargetLevel) {
  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
  options.disable_auto_compactions = true;
@@ -1235,10 +1238,10 @@ TEST_P(DBCompactionTestWithParam, TrivialMoveTargetLevel) {
 TEST_P(DBCompactionTestWithParam, ManualCompactionPartial) {
  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial_move++; });
  bool first = true;
@@ -1246,11 +1249,11 @@ TEST_P(DBCompactionTestWithParam, ManualCompactionPartial) {
  // 4 -> 1: ensure the order of two non-trivial compactions
  // 5 -> 2 and 5 -> 3: ensure we do a check before two non-trivial compactions
  // are installed
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBCompaction::ManualPartial:4", "DBCompaction::ManualPartial:1"},
       {"DBCompaction::ManualPartial:5", "DBCompaction::ManualPartial:2"},
       {"DBCompaction::ManualPartial:5", "DBCompaction::ManualPartial:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (first) {
          first = false;
@@ -1261,7 +1264,7 @@ TEST_P(DBCompactionTestWithParam, ManualCompactionPartial) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
  options.write_buffer_size = 10 * 1024 * 1024;
@@ -1326,7 +1329,7 @@ TEST_P(DBCompactionTestWithParam, ManualCompactionPartial) {
  ASSERT_EQ(trivial_move, 6);
  ASSERT_EQ(non_trivial_move, 0);

-  rocksdb::port::Thread threads([&] {
+  ROCKSDB_NAMESPACE::port::Thread threads([&] {
    compact_options.change_level = false;
    compact_options.exclusive_manual_compaction = false;
    std::string begin_string = Key(0);
@@ -1380,18 +1383,18 @@ TEST_P(DBCompactionTestWithParam, ManualCompactionPartial) {
 TEST_F(DBCompactionTest, DISABLED_ManualPartialFill) {
  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial_move++; });
  bool first = true;
  bool second = true;
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBCompaction::PartialFill:4", "DBCompaction::PartialFill:1"},
       {"DBCompaction::PartialFill:2", "DBCompaction::PartialFill:3"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* /*arg*/) {
        if (first) {
          TEST_SYNC_POINT("DBCompaction::PartialFill:4");
@@ -1401,7 +1404,7 @@ TEST_F(DBCompactionTest, DISABLED_ManualPartialFill) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
  options.write_buffer_size = 10 * 1024 * 1024;
@@ -1462,7 +1465,7 @@ TEST_F(DBCompactionTest, DISABLED_ManualPartialFill) {
  ASSERT_EQ(trivial_move, 2);
  ASSERT_EQ(non_trivial_move, 0);

-  rocksdb::port::Thread threads([&] {
+  ROCKSDB_NAMESPACE::port::Thread threads([&] {
    compact_options.change_level = false;
    compact_options.exclusive_manual_compaction = false;
    std::string begin_string = Key(0);
@@ -1504,7 +1507,7 @@ TEST_F(DBCompactionTest, DISABLED_ManualPartialFill) {
 }

 TEST_F(DBCompactionTest, ManualCompactionWithUnorderedWrite) {
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBImpl::WriteImpl:UnorderedWriteAfterWriteWAL",
        "DBCompactionTest::ManualCompactionWithUnorderedWrite:WaitWriteWAL"},
       {"DBImpl::WaitForPendingWrites:BeforeBlock",
@@ -1517,7 +1520,7 @@ TEST_F(DBCompactionTest, ManualCompactionWithUnorderedWrite) {
  ASSERT_OK(Flush());

  Put("bar", "v1");
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  port::Thread writer([&]() { Put("foo", "v2"); });

  TEST_SYNC_POINT(
@@ -1828,13 +1831,13 @@ TEST_F(DBCompactionTest, DeleteFileRangeFileEndpointsOverlapBug) {
 TEST_P(DBCompactionTestWithParam, TrivialMoveToLastLevelWithFiles) {
  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
  options.write_buffer_size = 100000000;
@@ -1883,7 +1886,7 @@ TEST_P(DBCompactionTestWithParam, TrivialMoveToLastLevelWithFiles) {
    ASSERT_EQ(Get(Key(i)), values[i]);
  }

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_P(DBCompactionTestWithParam, LevelCompactionThirdPath) {
@@ -2396,12 +2399,12 @@ TEST_F(DBCompactionTest, L0_CompactionBug_Issue44_b) {

 TEST_F(DBCompactionTest, ManualAutoRace) {
  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBImpl::BGWorkCompaction", "DBCompactionTest::ManualAutoRace:1"},
       {"DBImpl::RunManualCompaction:WaitScheduled",
        "BackgroundCallCompaction:0"}});

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Put(1, "foo", "");
  Put(1, "bar", "");
@@ -2432,13 +2435,13 @@ TEST_F(DBCompactionTest, ManualAutoRace) {
  // Eventually the cancelled compaction will be rescheduled and executed.
  dbfull()->TEST_WaitForCompact();
  ASSERT_EQ("0,1", FilesPerLevel(0));
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_P(DBCompactionTestWithParam, ManualCompaction) {
  Options options = CurrentOptions();
  options.max_subcompactions = max_subcompactions_;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  CreateAndReopenWithCF({"pikachu"}, options);

  // iter - 0 with 7 levels
@@ -2486,7 +2489,7 @@ TEST_P(DBCompactionTestWithParam, ManualCompaction) {
      options = CurrentOptions();
      options.num_levels = 3;
      options.create_if_missing = true;
-      options.statistics = rocksdb::CreateDBStatistics();
+      options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
      DestroyAndReopen(options);
      CreateAndReopenWithCF({"pikachu"}, options);
    }
@@ -2833,19 +2836,19 @@ TEST_P(DBCompactionTestWithParam, CompressLevelCompaction) {
                                   kZlibCompression};
  int matches = 0, didnt_match = 0, trivial_move = 0, non_trivial = 0;

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "Compaction::InputCompressionMatchesOutput:Matches",
      [&](void* /*arg*/) { matches++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "Compaction::InputCompressionMatchesOutput:DidntMatch",
      [&](void* /*arg*/) { didnt_match++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Reopen(options);

@@ -2906,7 +2909,7 @@ TEST_P(DBCompactionTestWithParam, CompressLevelCompaction) {
  ASSERT_EQ(trivial_move, 12);
  ASSERT_EQ(non_trivial, 8);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  for (int i = 0; i < key_idx; i++) {
    auto v = Get(Key(i));
@@ -2968,13 +2971,13 @@ TEST_F(DBCompactionTest, SuggestCompactRangeNoTwoLevel0Compactions) {
  }
  db_->CompactRange(CompactRangeOptions(), nullptr, nullptr);

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"CompactionJob::Run():Start",
        "DBCompactionTest::SuggestCompactRangeNoTwoLevel0Compactions:1"},
       {"DBCompactionTest::SuggestCompactRangeNoTwoLevel0Compactions:2",
        "CompactionJob::Run():End"}});

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // trigger L0 compaction
  for (int num = 0; num < options.level0_file_num_compaction_trigger + 1;
@@ -3010,25 +3013,26 @@ static std::string ShortKey(int i) {
 TEST_P(DBCompactionTestWithParam, ForceBottommostLevelCompaction) {
  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:TrivialMove",
      [&](void* /*arg*/) { trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial_move++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // The key size is guaranteed to be <= 8
  class ShortKeyComparator : public Comparator {
-    int Compare(const rocksdb::Slice& a,
-                const rocksdb::Slice& b) const override {
+    int Compare(const ROCKSDB_NAMESPACE::Slice& a,
+                const ROCKSDB_NAMESPACE::Slice& b) const override {
      assert(a.size() <= 8);
      assert(b.size() <= 8);
      return BytewiseComparator()->Compare(a, b);
    }
    const char* Name() const override { return "ShortKeyComparator"; }
-    void FindShortestSeparator(std::string* start,
-                               const rocksdb::Slice& limit) const override {
+    void FindShortestSeparator(
+        std::string* start,
+        const ROCKSDB_NAMESPACE::Slice& limit) const override {
      return BytewiseComparator()->FindShortestSeparator(start, limit);
    }
    void FindShortSuccessor(std::string* key) const override {
@@ -3105,7 +3109,7 @@ TEST_P(DBCompactionTestWithParam, ForceBottommostLevelCompaction) {
    ASSERT_EQ(Get(ShortKey(i)), values[i]);
  }

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_P(DBCompactionTestWithParam, IntraL0Compaction) {
@@ -3120,10 +3124,10 @@ TEST_P(DBCompactionTestWithParam, IntraL0Compaction) {
  Random rnd(301);
  std::string value(RandomString(&rnd, kValueSize));

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"LevelCompactionPicker::PickCompactionBySize:0",
        "CompactionJob::Run():Start"}});
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // index:   0   1   2   3   4   5   6   7   8   9
  // size:  1MB 1MB 1MB 1MB 1MB 2MB 1MB 1MB 1MB 1MB
@@ -3146,7 +3150,7 @@ TEST_P(DBCompactionTestWithParam, IntraL0Compaction) {
    ASSERT_OK(Flush());
  }
  dbfull()->TEST_WaitForCompact();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  std::vector<std::vector<FileMetaData>> level_to_files;
  dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
@@ -3174,10 +3178,10 @@ TEST_P(DBCompactionTestWithParam, IntraL0CompactionDoesNotObsoleteDeletions) {
  Random rnd(301);
  std::string value(RandomString(&rnd, kValueSize));

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"LevelCompactionPicker::PickCompactionBySize:0",
        "CompactionJob::Run():Start"}});
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // index:   0   1   2   3   4    5    6   7   8   9
  // size:  1MB 1MB 1MB 1MB 1MB  1MB  1MB 1MB 1MB 1MB
@@ -3203,7 +3207,7 @@ TEST_P(DBCompactionTestWithParam, IntraL0CompactionDoesNotObsoleteDeletions) {
    ASSERT_OK(Flush());
  }
  dbfull()->TEST_WaitForCompact();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  std::vector<std::vector<FileMetaData>> level_to_files;
  dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
@@ -3256,7 +3260,7 @@ TEST_P(DBCompactionTestWithParam, FullCompactionInBottomPriThreadPool) {

    // Verify that size amplification did occur
    ASSERT_EQ(NumSortedRuns(), 1);
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
  Env::Default()->SetBackgroundThreads(0, Env::Priority::BOTTOM);
 }
@@ -3267,7 +3271,7 @@ TEST_F(DBCompactionTest, OptimizedDeletionObsoleting) {
  const int kNumL0Files = 4;
  Options options = CurrentOptions();
  options.level0_file_num_compaction_trigger = kNumL0Files;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  DestroyAndReopen(options);

  // put key 1 and 3 in separate L1, L2 files.
@@ -3312,12 +3316,12 @@ TEST_F(DBCompactionTest, CompactFilesPendingL0Bug) {
  options.max_background_compactions = 2;
  DestroyAndReopen(options);

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"LevelCompactionPicker::PickCompaction:Return",
        "DBCompactionTest::CompactFilesPendingL0Bug:Picked"},
       {"DBCompactionTest::CompactFilesPendingL0Bug:ManualCompacted",
        "DBImpl::BackgroundCompaction:NonTrivial:AfterRun"}});
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  auto schedule_multi_compaction_token =
      dbfull()->TEST_write_controler().GetCompactionPressureToken();
@@ -3347,7 +3351,7 @@ TEST_F(DBCompactionTest, CompactFilesPendingL0Bug) {
                  ->CompactFiles(CompactionOptions(), input_filenames,
                                 0 /* output_level */));
  TEST_SYNC_POINT("DBCompactionTest::CompactFilesPendingL0Bug:ManualCompacted");
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBCompactionTest, CompactFilesOverlapInL0Bug) {
@@ -3421,13 +3425,13 @@ TEST_F(DBCompactionTest, CompactBottomLevelFilesWithDeletions) {
  // file without changing file count.
  db_->ReleaseSnapshot(snapshot);
  ASSERT_EQ(kMaxSequenceNumber, dbfull()->bottommost_files_mark_threshold_);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        ASSERT_TRUE(compaction->compaction_reason() ==
                    CompactionReason::kBottommostFiles);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  dbfull()->TEST_WaitForCompact();
  db_->GetLiveFilesMetaData(&post_release_metadata);
  ASSERT_EQ(pre_release_metadata.size(), post_release_metadata.size());
@@ -3441,7 +3445,7 @@ TEST_F(DBCompactionTest, CompactBottomLevelFilesWithDeletions) {
    // deletion markers/deleted keys.
    ASSERT_LT(post_file.size, pre_file.size);
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBCompactionTest, LevelCompactExpiredTtlFiles) {
@@ -3490,16 +3494,16 @@ TEST_F(DBCompactionTest, LevelCompactExpiredTtlFiles) {
  // compacted.
  ASSERT_OK(Put("a", "1"));
  Flush();
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        ASSERT_TRUE(compaction->compaction_reason() == CompactionReason::kTtl);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  dbfull()->TEST_WaitForCompact();
  // All non-L0 files are deleted, as they contained only deleted data.
  ASSERT_EQ("1", FilesPerLevel());
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  // Test dynamically changing ttl.

@@ -3537,12 +3541,12 @@ TEST_F(DBCompactionTest, LevelCompactExpiredTtlFiles) {
  dbfull()->TEST_WaitForCompact();
  ASSERT_EQ("1,2,0,2", FilesPerLevel());

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        ASSERT_TRUE(compaction->compaction_reason() == CompactionReason::kTtl);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Dynamically change ttl to 10 hours.
  // This should trigger a ttl compaction, as 12 hours have already passed.
@@ -3550,7 +3554,7 @@ TEST_F(DBCompactionTest, LevelCompactExpiredTtlFiles) {
  dbfull()->TEST_WaitForCompact();
  // All non-L0 files are deleted, as they contained only deleted data.
  ASSERT_EQ("1", FilesPerLevel());
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
@@ -3567,7 +3571,7 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
        options.max_open_files = 20;
      }
      // RocksDB sanitize max open files to at least 20. Modify it back.
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "SanitizeOptions::AfterChangeMaxOpenFiles", [&](void* arg) {
            int* max_open_files = static_cast<int*>(arg);
            *max_open_files = 2;
@@ -3575,7 +3579,7 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
      // In the case where all files are opened and doing DB restart
      // forcing the oldest ancester time in manifest file to be 0 to
      // simulate the case of reading from an old version.
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "VersionEdit::EncodeTo:VarintOldestAncesterTime", [&](void* arg) {
            if (if_restart && if_open_all_files) {
              std::string* encoded_fieled = static_cast<std::string*>(arg);
@@ -3591,7 +3595,7 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
      DestroyAndReopen(options);

      int ttl_compactions = 0;
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
            Compaction* compaction = reinterpret_cast<Compaction*>(arg);
            auto compaction_reason = compaction->compaction_reason();
@@ -3599,7 +3603,7 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
              ttl_compactions++;
            }
          });
-      rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

      // Add two L6 files with key ranges: [1 .. 100], [101 .. 200].
      Random rnd(301);
@@ -3607,6 +3611,15 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
        ASSERT_OK(Put(Key(i), RandomString(&rnd, kValueSize)));
      }
      Flush();
+      // Get the first file's creation time. This will be the oldest file in the
+      // DB. Compactions inolving this file's descendents should keep getting
+      // this time.
+      std::vector<std::vector<FileMetaData>> level_to_files;
+      dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
+                                      &level_to_files);
+      uint64_t oldest_time = level_to_files[0][0].oldest_ancester_time;
+      // Add 1 hour and do another flush.
+      env_->addon_time_.fetch_add(1 * 60 * 60);
      for (int i = 101; i <= 200; ++i) {
        ASSERT_OK(Put(Key(i), RandomString(&rnd, kValueSize)));
      }
@@ -3614,11 +3627,13 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
      MoveFilesToLevel(6);
      ASSERT_EQ("0,0,0,0,0,0,2", FilesPerLevel());

+      env_->addon_time_.fetch_add(1 * 60 * 60);
      // Add two L4 files with key ranges: [1 .. 50], [51 .. 150].
      for (int i = 1; i <= 50; ++i) {
        ASSERT_OK(Put(Key(i), RandomString(&rnd, kValueSize)));
      }
      Flush();
+      env_->addon_time_.fetch_add(1 * 60 * 60);
      for (int i = 51; i <= 150; ++i) {
        ASSERT_OK(Put(Key(i), RandomString(&rnd, kValueSize)));
      }
@@ -3626,6 +3641,7 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
      MoveFilesToLevel(4);
      ASSERT_EQ("0,0,0,0,2,0,2", FilesPerLevel());

+      env_->addon_time_.fetch_add(1 * 60 * 60);
      // Add one L1 file with key range: [26, 75].
      for (int i = 26; i <= 75; ++i) {
        ASSERT_OK(Put(Key(i), RandomString(&rnd, kValueSize)));
@@ -3667,6 +3683,10 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
      ASSERT_EQ("1,0,0,0,0,0,1", FilesPerLevel());
      ASSERT_EQ(5, ttl_compactions);

+      dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
+                                      &level_to_files);
+      ASSERT_EQ(oldest_time, level_to_files[6][0].oldest_ancester_time);
+
      env_->addon_time_.fetch_add(25 * 60 * 60);
      ASSERT_OK(Put(Key(2), "1"));
      if (if_restart) {
@@ -3678,7 +3698,7 @@ TEST_F(DBCompactionTest, LevelTtlCascadingCompactions) {
      ASSERT_EQ("1,0,0,0,0,0,1", FilesPerLevel());
      ASSERT_GE(ttl_compactions, 6);

-      rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
    }
  }
 }
@@ -3698,7 +3718,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompaction) {
        options.max_open_files = 20;
      }
      // RocksDB sanitize max open files to at least 20. Modify it back.
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "SanitizeOptions::AfterChangeMaxOpenFiles", [&](void* arg) {
            int* max_open_files = static_cast<int*>(arg);
            *max_open_files = 0;
@@ -3706,7 +3726,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompaction) {
      // In the case where all files are opened and doing DB restart
      // forcing the file creation time in manifest file to be 0 to
      // simulate the case of reading from an old version.
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "VersionEdit::EncodeTo:VarintFileCreationTime", [&](void* arg) {
            if (if_restart && if_open_all_files) {
              std::string* encoded_fieled = static_cast<std::string*>(arg);
@@ -3722,7 +3742,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompaction) {
      DestroyAndReopen(options);

      int periodic_compactions = 0;
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
            Compaction* compaction = reinterpret_cast<Compaction*>(arg);
            auto compaction_reason = compaction->compaction_reason();
@@ -3730,7 +3750,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompaction) {
              periodic_compactions++;
            }
          });
-      rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

      Random rnd(301);
      for (int i = 0; i < kNumLevelFiles; ++i) {
@@ -3782,7 +3802,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompaction) {
      // + 4.
      ASSERT_EQ(9, periodic_compactions);

-      rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
    }
  }
 }
@@ -3806,7 +3826,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompactionWithOldDB) {
  int periodic_compactions = 0;
  bool set_file_creation_time_to_zero = true;
  bool set_creation_time_to_zero = true;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        auto compaction_reason = compaction->compaction_reason();
@@ -3814,7 +3834,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompactionWithOldDB) {
          periodic_compactions++;
        }
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "PropertyBlockBuilder::AddTableProperty:Start", [&](void* arg) {
        TableProperties* props = reinterpret_cast<TableProperties*>(arg);
        if (set_file_creation_time_to_zero) {
@@ -3824,7 +3844,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompactionWithOldDB) {
          props->creation_time = 0;
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);
  for (int i = 0; i < kNumFiles; ++i) {
@@ -3857,7 +3877,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompactionWithOldDB) {
  // Make sure that all files go through periodic compaction.
  ASSERT_EQ(kNumFiles, periodic_compactions);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBCompactionTest, LevelPeriodicAndTtlCompaction) {
@@ -3877,7 +3897,7 @@ TEST_F(DBCompactionTest, LevelPeriodicAndTtlCompaction) {

  int periodic_compactions = 0;
  int ttl_compactions = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        auto compaction_reason = compaction->compaction_reason();
@@ -3887,7 +3907,7 @@ TEST_F(DBCompactionTest, LevelPeriodicAndTtlCompaction) {
          ttl_compactions++;
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);
  for (int i = 0; i < kNumLevelFiles; ++i) {
@@ -3938,7 +3958,7 @@ TEST_F(DBCompactionTest, LevelPeriodicAndTtlCompaction) {
  ASSERT_EQ(6, periodic_compactions);
  ASSERT_EQ(6, ttl_compactions);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBCompactionTest, LevelPeriodicCompactionWithCompactionFilters) {
@@ -3991,7 +4011,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompactionWithCompactionFilters) {
              dbfull()->GetOptions().periodic_compaction_seconds);

    int periodic_compactions = 0;
-    rocksdb::SyncPoint::GetInstance()->SetCallBack(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
        "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
          Compaction* compaction = reinterpret_cast<Compaction*>(arg);
          auto compaction_reason = compaction->compaction_reason();
@@ -3999,7 +4019,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompactionWithCompactionFilters) {
            periodic_compactions++;
          }
        });
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    for (int i = 0; i < kNumLevelFiles; ++i) {
      for (int j = 0; j < kNumKeysPerFile; ++j) {
@@ -4023,7 +4043,7 @@ TEST_F(DBCompactionTest, LevelPeriodicCompactionWithCompactionFilters) {
    // The two old files go through the periodic compaction process
    ASSERT_EQ(2, periodic_compactions);

-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
 }

@@ -4049,16 +4069,17 @@ TEST_F(DBCompactionTest, CompactRangeDelayedByL0FileCount) {
    if (i == 0) {
      // ensure the auto compaction doesn't finish until manual compaction has
      // had a chance to be delayed.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
          {{"DBImpl::WaitUntilFlushWouldNotStallWrites:StallWait",
            "CompactionJob::Run():End"}});
    } else {
      // ensure the auto-compaction doesn't finish until manual compaction has
      // continued without delay.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
-          {{"DBImpl::FlushMemTable:StallWaitDone", "CompactionJob::Run():End"}});
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
+          {{"DBImpl::FlushMemTable:StallWaitDone",
+            "CompactionJob::Run():End"}});
    }
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    Random rnd(301);
    for (int j = 0; j < kNumL0FilesLimit - 1; ++j) {
@@ -4077,7 +4098,7 @@ TEST_F(DBCompactionTest, CompactRangeDelayedByL0FileCount) {
    dbfull()->TEST_WaitForCompact();
    ASSERT_EQ(0, NumTableFilesAtLevel(0));
    ASSERT_GT(NumTableFilesAtLevel(1), 0);
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
 }

@@ -4103,17 +4124,17 @@ TEST_F(DBCompactionTest, CompactRangeDelayedByImmMemTableCount) {
    if (i == 0) {
      // ensure the flush doesn't finish until manual compaction has had a
      // chance to be delayed.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
          {{"DBImpl::WaitUntilFlushWouldNotStallWrites:StallWait",
            "FlushJob::WriteLevel0Table"}});
    } else {
      // ensure the flush doesn't finish until manual compaction has continued
      // without delay.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
          {{"DBImpl::FlushMemTable:StallWaitDone",
            "FlushJob::WriteLevel0Table"}});
    }
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    Random rnd(301);
    for (int j = 0; j < kNumImmMemTableLimit - 1; ++j) {
@@ -4134,7 +4155,7 @@ TEST_F(DBCompactionTest, CompactRangeDelayedByImmMemTableCount) {
    dbfull()->TEST_WaitForFlushMemTable();
    ASSERT_EQ(0, NumTableFilesAtLevel(0));
    ASSERT_GT(NumTableFilesAtLevel(1), 0);
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
 }

@@ -4155,12 +4176,12 @@ TEST_F(DBCompactionTest, CompactRangeShutdownWhileDelayed) {
    // The calls to close CF/DB wait until the manual compaction stalls.
    // The auto-compaction waits until the manual compaction finishes to ensure
    // the signal comes from closing CF/DB, not from compaction making progress.
-    rocksdb::SyncPoint::GetInstance()->LoadDependency(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
        {{"DBImpl::WaitUntilFlushWouldNotStallWrites:StallWait",
          "DBCompactionTest::CompactRangeShutdownWhileDelayed:PreShutdown"},
         {"DBCompactionTest::CompactRangeShutdownWhileDelayed:PostManual",
          "CompactionJob::Run():End"}});
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    Random rnd(301);
    for (int j = 0; j < kNumL0FilesLimit - 1; ++j) {
@@ -4193,7 +4214,7 @@ TEST_F(DBCompactionTest, CompactRangeShutdownWhileDelayed) {
    TEST_SYNC_POINT(
        "DBCompactionTest::CompactRangeShutdownWhileDelayed:PostManual");
    dbfull()->TEST_WaitForCompact();
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
 }

@@ -4212,13 +4233,13 @@ TEST_F(DBCompactionTest, CompactRangeSkipFlushAfterDelay) {
  // The manual flush includes the memtable that was active when CompactRange
  // began. So it unblocks CompactRange and precludes its flush. Throughout the
  // test, stall conditions are upheld via high L0 file count.
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBImpl::WaitUntilFlushWouldNotStallWrites:StallWait",
        "DBCompactionTest::CompactRangeSkipFlushAfterDelay:PreFlush"},
       {"DBCompactionTest::CompactRangeSkipFlushAfterDelay:PostFlush",
        "DBImpl::FlushMemTable:StallWaitDone"},
       {"DBImpl::FlushMemTable:StallWaitDone", "CompactionJob::Run():End"}});
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  //used for the delayable flushes
  FlushOptions flush_opts;
@@ -4248,7 +4269,7 @@ TEST_F(DBCompactionTest, CompactRangeSkipFlushAfterDelay) {
  db_->GetProperty(DB::Properties::kNumEntriesActiveMemTable, &num_keys_in_memtable);
  ASSERT_EQ(ToString(1), num_keys_in_memtable);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBCompactionTest, CompactRangeFlushOverlappingMemtable) {
@@ -4490,29 +4511,29 @@ TEST_F(DBCompactionTest, CompactionLimiter) {

  port::Mutex mutex;

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-    "DBImpl::BackgroundCompaction:BeforeCompaction", [&](void* arg) {
-      const auto& cf_name = static_cast<ColumnFamilyData*>(arg)->GetName();
-      auto iter = cf_to_limiter.find(cf_name);
-      if (iter != cf_to_limiter.end()) {
-        MutexLock l(&mutex);
-        ASSERT_GE(iter->second->limit_tasks, ++iter->second->tasks);
-        iter->second->max_tasks = std::max(iter->second->max_tasks,
-              iter->second->limit_tasks);
-      }
-    });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::BackgroundCompaction:BeforeCompaction", [&](void* arg) {
+        const auto& cf_name = static_cast<ColumnFamilyData*>(arg)->GetName();
+        auto iter = cf_to_limiter.find(cf_name);
+        if (iter != cf_to_limiter.end()) {
+          MutexLock l(&mutex);
+          ASSERT_GE(iter->second->limit_tasks, ++iter->second->tasks);
+          iter->second->max_tasks =
+              std::max(iter->second->max_tasks, iter->second->limit_tasks);
+        }
+      });

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-    "DBImpl::BackgroundCompaction:AfterCompaction", [&](void* arg) {
-      const auto& cf_name = static_cast<ColumnFamilyData*>(arg)->GetName();
-      auto iter = cf_to_limiter.find(cf_name);
-      if (iter != cf_to_limiter.end()) {
-        MutexLock l(&mutex);
-        ASSERT_GE(--iter->second->tasks, 0);
-      }
-    });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::BackgroundCompaction:AfterCompaction", [&](void* arg) {
+        const auto& cf_name = static_cast<ColumnFamilyData*>(arg)->GetName();
+        auto iter = cf_to_limiter.find(cf_name);
+        if (iter != cf_to_limiter.end()) {
+          MutexLock l(&mutex);
+          ASSERT_GE(--iter->second->tasks, 0);
+        }
+      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Block all compact threads in thread pool.
  const size_t kTotalFlushTasks = kMaxBackgroundThreads / 4;
@@ -4850,12 +4871,10 @@ TEST_F(DBCompactionTest, CompactionDuringShutdown) {
    Flush();
  }

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:BeforeRun",
-      [&](void* /*arg*/) {
-    dbfull()->shutting_down_.store(true);
-  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+      [&](void* /*arg*/) { dbfull()->shutting_down_.store(true); });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
  ASSERT_OK(dbfull()->error_handler_.GetBGError());
 }
@@ -4941,7 +4960,7 @@ TEST_F(DBCompactionTest, ConsistencyFailTest) {
  Options options = CurrentOptions();
  DestroyAndReopen(options);

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "VersionBuilder::CheckConsistency", [&](void* arg) {
        auto p =
            reinterpret_cast<std::pair<FileMetaData**, FileMetaData**>*>(arg);
@@ -4952,7 +4971,7 @@ TEST_F(DBCompactionTest, ConsistencyFailTest) {
        *(p->second) = temp;
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  for (int k = 0; k < 2; ++k) {
    ASSERT_OK(Put("foo", "bar"));
@@ -4960,7 +4979,7 @@ TEST_F(DBCompactionTest, ConsistencyFailTest) {
  }

  ASSERT_NOK(Put("foo", "bar"));
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 void IngestOneKeyValue(DBImpl* db, const std::string& key,
@@ -4968,7 +4987,7 @@ void IngestOneKeyValue(DBImpl* db, const std::string& key,
  ExternalSstFileInfo info;
  std::string f = test::PerThreadDBPath("sst_file" + key);
  EnvOptions env;
-  rocksdb::SstFileWriter writer(env, options);
+  ROCKSDB_NAMESPACE::SstFileWriter writer(env, options);
  auto s = writer.Open(f);
  ASSERT_OK(s);
  // ASSERT_OK(writer.Put(Key(), ""));
@@ -4995,14 +5014,14 @@ TEST_P(DBCompactionTestWithParam,
  std::atomic<int> pick_intra_l0_count(0);
  std::string value(RandomString(&rnd, kValueSize));

-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBCompactionTestWithParam::FlushAfterIntraL0:1",
        "CompactionJob::Run():Start"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "FindIntraL0Compaction",
      [&](void* /*arg*/) { pick_intra_l0_count.fetch_add(1); });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // prevents trivial move
  for (int i = 0; i < 10; ++i) {
@@ -5037,7 +5056,7 @@ TEST_P(DBCompactionTestWithParam,
  ASSERT_OK(Put(Key(2), "b"));
  ASSERT_EQ(10, NumTableFilesAtLevel(0));
  dbfull()->TEST_WaitForCompact();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  std::vector<std::vector<FileMetaData>> level_to_files;
  dbfull()->TEST_GetFilesMetaData(dbfull()->DefaultColumnFamily(),
                                  &level_to_files);
@@ -5074,13 +5093,13 @@ TEST_P(DBCompactionTestWithParam,
  ASSERT_EQ(0, NumTableFilesAtLevel(0));

  std::atomic<int> pick_intra_l0_count(0);
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBCompactionTestWithParam::IntraL0CompactionAfterFlush:1",
        "CompactionJob::Run():Start"}});
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "FindIntraL0Compaction",
      [&](void* /*arg*/) { pick_intra_l0_count.fetch_add(1); });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  // Make 6 L0 sst.
  for (int i = 0; i < 6; ++i) {
    if (i % 2 == 0) {
@@ -5118,7 +5137,7 @@ TEST_P(DBCompactionTestWithParam,
  sleeping_tasks.WaitUntilDone();
  TEST_SYNC_POINT("DBCompactionTestWithParam::IntraL0CompactionAfterFlush:1");
  dbfull()->TEST_WaitForCompact();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  uint64_t error_count = 0;
  db_->GetIntProperty("rocksdb.background-errors", &error_count);
@@ -5133,11 +5152,11 @@ TEST_P(DBCompactionTestWithParam,
 }

 #endif // !defined(ROCKSDB_LITE)
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
 #if !defined(ROCKSDB_LITE)
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 #else
@@ -16,7 +16,7 @@
 #include "port/port.h"
 #include "port/stack_trace.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 class DBTestDynamicLevel : public DBTestBase {
 public:
  DBTestDynamicLevel() : DBTestBase("/db_dynamic_level_test") {}
@@ -221,10 +221,10 @@ TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBase2) {

  // Make sure that the compaction starts before the last bit of data is
  // flushed, so that the base level isn't raised to L1.
-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"CompactionJob::Run():Start", "DynamicLevelMaxBytesBase2:0"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  ASSERT_OK(dbfull()->SetOptions({
      {"disable_auto_compactions", "false"},
@@ -235,20 +235,20 @@ TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBase2) {
  dbfull()->TEST_WaitForCompact();
  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
  ASSERT_EQ(2U, int_prop);
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();

  // Write more data until the base level changes to L1. There will be
  // a manual compaction going on at the same time.
-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"CompactionJob::Run():Start", "DynamicLevelMaxBytesBase2:1"},
      {"DynamicLevelMaxBytesBase2:2", "CompactionJob::Run():End"},
      {"DynamicLevelMaxBytesBase2:compact_range_finish",
       "FlushJob::WriteLevel0Table"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

-  rocksdb::port::Thread thread([this] {
+  ROCKSDB_NAMESPACE::port::Thread thread([this] {
    TEST_SYNC_POINT("DynamicLevelMaxBytesBase2:compact_range_start");
    ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
    TEST_SYNC_POINT("DynamicLevelMaxBytesBase2:compact_range_finish");
@@ -265,8 +265,8 @@ TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBase2) {

  thread.join();

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();

  ASSERT_TRUE(db_->GetIntProperty("rocksdb.base-level", &int_prop));
  ASSERT_EQ(1U, int_prop);
@@ -329,16 +329,16 @@ TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesCompactRange) {
  ASSERT_TRUE(db_->GetProperty("rocksdb.num-files-at-level2", &str_prop));
  ASSERT_EQ("0", str_prop);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();

  std::set<int> output_levels;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "CompactionPicker::CompactRange:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        output_levels.insert(compaction->output_level());
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
  ASSERT_EQ(output_levels.size(), 2);
@@ -373,10 +373,10 @@ TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBaseInc) {
  DestroyAndReopen(options);

  int non_trivial = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial",
      [&](void* /*arg*/) { non_trivial++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);
  const int total_keys = 3000;
@@ -388,7 +388,7 @@ TEST_F(DBTestDynamicLevel, DynamicLevelMaxBytesBaseInc) {
  }
  Flush();
  dbfull()->TEST_WaitForCompact();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  ASSERT_EQ(non_trivial, 0);

@@ -457,7 +457,7 @@ TEST_F(DBTestDynamicLevel, DISABLED_MigrateToDynamicLevelMaxBytesBase) {
  compaction_finished = false;
  // Issue manual compaction in one thread and still verify DB state
  // in main thread.
-  rocksdb::port::Thread t([&]() {
+  ROCKSDB_NAMESPACE::port::Thread t([&]() {
    CompactRangeOptions compact_options;
    compact_options.change_level = true;
    compact_options.target_level = options.num_levels - 1;
@@ -488,13 +488,13 @@ TEST_F(DBTestDynamicLevel, DISABLED_MigrateToDynamicLevelMaxBytesBase) {
  ASSERT_EQ(NumTableFilesAtLevel(1), 0);
  ASSERT_EQ(NumTableFilesAtLevel(2), 0);
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // !defined(ROCKSDB_LITE)

 int main(int argc, char** argv) {
 #if !defined(ROCKSDB_LITE)
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 #else
@@ -12,7 +12,7 @@
 #include <iostream>
 #include <string>

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBEncryptionTest : public DBTestBase {
 public:
@@ -113,10 +113,10 @@ TEST_F(DBEncryptionTest, ReadEmptyFile) {

 #endif // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -21,7 +21,7 @@
 #include "test_util/sync_point.h"
 #include "util/mutexlock.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 Status DBImpl::DisableFileDeletions() {
  InstrumentedMutexLock l(&mutex_);
@@ -172,6 +172,6 @@ Status DBImpl::GetCurrentWalFile(std::unique_ptr<LogFile>* current_log_file) {

  return wal_manager_.GetLiveWalFile(current_logfile_number, current_log_file);
 }
-}
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // ROCKSDB_LITE
@@ -18,7 +18,7 @@
 #include "util/cast_util.h"
 #include "util/mutexlock.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBFlushTest : public DBTestBase {
 public:
@@ -741,15 +741,44 @@ TEST_P(DBAtomicFlushTest, CFDropRaceWithWaitForFlushMemTables) {
  SyncPoint::GetInstance()->DisableProcessing();
 }

+TEST_P(DBAtomicFlushTest, RollbackAfterFailToInstallResults) {
+  bool atomic_flush = GetParam();
+  if (!atomic_flush) {
+    return;
+  }
+  auto fault_injection_env = std::make_shared<FaultInjectionTestEnv>(env_);
+  Options options = CurrentOptions();
+  options.env = fault_injection_env.get();
+  options.create_if_missing = true;
+  options.atomic_flush = atomic_flush;
+  CreateAndReopenWithCF({"pikachu"}, options);
+  ASSERT_EQ(2, handles_.size());
+  for (size_t cf = 0; cf < handles_.size(); ++cf) {
+    ASSERT_OK(Put(static_cast<int>(cf), "a", "value"));
+  }
+  SyncPoint::GetInstance()->DisableProcessing();
+  SyncPoint::GetInstance()->ClearAllCallBacks();
+  SyncPoint::GetInstance()->SetCallBack(
+      "VersionSet::ProcessManifestWrites:BeforeWriteLastVersionEdit:0",
+      [&](void* /*arg*/) { fault_injection_env->SetFilesystemActive(false); });
+  SyncPoint::GetInstance()->EnableProcessing();
+  FlushOptions flush_opts;
+  Status s = db_->Flush(flush_opts, handles_);
+  ASSERT_NOK(s);
+  fault_injection_env->SetFilesystemActive(true);
+  Close();
+  SyncPoint::GetInstance()->ClearAllCallBacks();
+}
+
 INSTANTIATE_TEST_CASE_P(DBFlushDirectIOTest, DBFlushDirectIOTest,
                        testing::Bool());

 INSTANTIATE_TEST_CASE_P(DBAtomicFlushTest, DBAtomicFlushTest, testing::Bool());

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -102,7 +102,7 @@
 #include "util/stop_watch.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 const std::string kDefaultColumnFamilyName("default");
 const std::string kPersistentStatsColumnFamilyName(
@@ -644,7 +644,7 @@ void DBImpl::StartTimedTasks() {
    stats_dump_period_sec = mutable_db_options_.stats_dump_period_sec;
    if (stats_dump_period_sec > 0) {
      if (!thread_dump_stats_) {
-        thread_dump_stats_.reset(new rocksdb::RepeatableThread(
+        thread_dump_stats_.reset(new ROCKSDB_NAMESPACE::RepeatableThread(
            [this]() { DBImpl::DumpStats(); }, "dump_st", env_,
            static_cast<uint64_t>(stats_dump_period_sec) * kMicrosInSecond));
      }
@@ -652,7 +652,7 @@ void DBImpl::StartTimedTasks() {
    stats_persist_period_sec = mutable_db_options_.stats_persist_period_sec;
    if (stats_persist_period_sec > 0) {
      if (!thread_persist_stats_) {
-        thread_persist_stats_.reset(new rocksdb::RepeatableThread(
+        thread_persist_stats_.reset(new ROCKSDB_NAMESPACE::RepeatableThread(
            [this]() { DBImpl::PersistStats(); }, "pst_st", env_,
            static_cast<uint64_t>(stats_persist_period_sec) * kMicrosInSecond));
      }
@@ -1005,12 +1005,36 @@ Status DBImpl::SetDBOptions(
      }
    }
    if (s.ok()) {
-      if (new_options.max_background_compactions >
-          mutable_db_options_.max_background_compactions) {
-        env_->IncBackgroundThreadsIfNeeded(
-            new_options.max_background_compactions, Env::Priority::LOW);
+      const BGJobLimits current_bg_job_limits =
+          GetBGJobLimits(immutable_db_options_.max_background_flushes,
+                         mutable_db_options_.max_background_compactions,
+                         mutable_db_options_.max_background_jobs,
+                         /* parallelize_compactions */ true);
+      const BGJobLimits new_bg_job_limits = GetBGJobLimits(
+          immutable_db_options_.max_background_flushes,
+          new_options.max_background_compactions,
+          new_options.max_background_jobs, /* parallelize_compactions */ true);
+
+      const bool max_flushes_increased =
+          new_bg_job_limits.max_flushes > current_bg_job_limits.max_flushes;
+      const bool max_compactions_increased =
+          new_bg_job_limits.max_compactions >
+          current_bg_job_limits.max_compactions;
+
+      if (max_flushes_increased || max_compactions_increased) {
+        if (max_flushes_increased) {
+          env_->IncBackgroundThreadsIfNeeded(new_bg_job_limits.max_flushes,
+                                             Env::Priority::HIGH);
+        }
+
+        if (max_compactions_increased) {
+          env_->IncBackgroundThreadsIfNeeded(new_bg_job_limits.max_compactions,
+                                             Env::Priority::LOW);
+        }
+
        MaybeScheduleFlushOrCompaction();
      }
+
      if (new_options.stats_dump_period_sec !=
          mutable_db_options_.stats_dump_period_sec) {
        if (thread_dump_stats_) {
@@ -1019,7 +1043,7 @@ Status DBImpl::SetDBOptions(
          mutex_.Lock();
        }
        if (new_options.stats_dump_period_sec > 0) {
-          thread_dump_stats_.reset(new rocksdb::RepeatableThread(
+          thread_dump_stats_.reset(new ROCKSDB_NAMESPACE::RepeatableThread(
              [this]() { DBImpl::DumpStats(); }, "dump_st", env_,
              static_cast<uint64_t>(new_options.stats_dump_period_sec) *
                  kMicrosInSecond));
@@ -1035,7 +1059,7 @@ Status DBImpl::SetDBOptions(
          mutex_.Lock();
        }
        if (new_options.stats_persist_period_sec > 0) {
-          thread_persist_stats_.reset(new rocksdb::RepeatableThread(
+          thread_persist_stats_.reset(new ROCKSDB_NAMESPACE::RepeatableThread(
              [this]() { DBImpl::PersistStats(); }, "pst_st", env_,
              static_cast<uint64_t>(new_options.stats_persist_period_sec) *
                  kMicrosInSecond));
@@ -2277,7 +2301,8 @@ Status DBImpl::CreateColumnFamilyImpl(const ColumnFamilyOptions& cf_options,
      auto* cfd =
          versions_->GetColumnFamilySet()->GetColumnFamily(column_family_name);
      assert(cfd != nullptr);
-      s = cfd->AddDirectories();
+      std::map<std::string, std::shared_ptr<Directory>> dummy_created_dirs;
+      s = cfd->AddDirectories(&dummy_created_dirs);
    }
    if (s.ok()) {
      single_column_family_mode_ = false;
@@ -2536,7 +2561,7 @@ ArenaWrappedDBIter* DBImpl::NewIteratorImpl(const ReadOptions& read_options,
      env_, read_options, *cfd->ioptions(), sv->mutable_cf_options, snapshot,
      sv->mutable_cf_options.max_sequential_skip_in_iterations,
      sv->version_number, read_callback, this, cfd, allow_blob,
-      ((read_options.snapshot != nullptr) ? false : allow_refresh));
+      read_options.snapshot != nullptr ? false : allow_refresh);

  InternalIterator* internal_iter =
      NewInternalIterator(read_options, cfd, sv, db_iter->GetArena(),
@@ -3293,27 +3318,67 @@ Status DBImpl::CheckConsistency() {
  TEST_SYNC_POINT("DBImpl::CheckConsistency:AfterGetLiveFilesMetaData");

  std::string corruption_messages;
-  for (const auto& md : metadata) {
-    // md.name has a leading "/".
-    std::string file_path = md.db_path + md.name;

-    uint64_t fsize = 0;
-    TEST_SYNC_POINT("DBImpl::CheckConsistency:BeforeGetFileSize");
-    Status s = env_->GetFileSize(file_path, &fsize);
-    if (!s.ok() &&
-        env_->GetFileSize(Rocks2LevelTableFileName(file_path), &fsize).ok()) {
-      s = Status::OK();
+  if (immutable_db_options_.skip_checking_sst_file_sizes_on_db_open) {
+    // Instead of calling GetFileSize() for each expected file, call
+    // GetChildren() for the DB directory and check that all expected files
+    // are listed, without checking their sizes.
+    // Since sst files might be in different directories, do it for each
+    // directory separately.
+    std::map<std::string, std::vector<std::string>> files_by_directory;
+    for (const auto& md : metadata) {
+      // md.name has a leading "/". Remove it.
+      std::string fname = md.name;
+      if (!fname.empty() && fname[0] == '/') {
+        fname = fname.substr(1);
+      }
+      files_by_directory[md.db_path].push_back(fname);
    }
-    if (!s.ok()) {
-      corruption_messages +=
-          "Can't access " + md.name + ": " + s.ToString() + "\n";
-    } else if (fsize != md.size) {
-      corruption_messages += "Sst file size mismatch: " + file_path +
-                             ". Size recorded in manifest " +
-                             ToString(md.size) + ", actual size " +
-                             ToString(fsize) + "\n";
+    for (const auto& dir_files : files_by_directory) {
+      std::string directory = dir_files.first;
+      std::vector<std::string> existing_files;
+      Status s = env_->GetChildren(directory, &existing_files);
+      if (!s.ok()) {
+        corruption_messages +=
+            "Can't list files in " + directory + ": " + s.ToString() + "\n";
+        continue;
+      }
+      std::sort(existing_files.begin(), existing_files.end());
+
+      for (const std::string& fname : dir_files.second) {
+        if (!std::binary_search(existing_files.begin(), existing_files.end(),
+                                fname) &&
+            !std::binary_search(existing_files.begin(), existing_files.end(),
+                                Rocks2LevelTableFileName(fname))) {
+          corruption_messages +=
+              "Missing sst file " + fname + " in " + directory + "\n";
+        }
+      }
+    }
+  } else {
+    for (const auto& md : metadata) {
+      // md.name has a leading "/".
+      std::string file_path = md.db_path + md.name;
+
+      uint64_t fsize = 0;
+      TEST_SYNC_POINT("DBImpl::CheckConsistency:BeforeGetFileSize");
+      Status s = env_->GetFileSize(file_path, &fsize);
+      if (!s.ok() &&
+          env_->GetFileSize(Rocks2LevelTableFileName(file_path), &fsize).ok()) {
+        s = Status::OK();
+      }
+      if (!s.ok()) {
+        corruption_messages +=
+            "Can't access " + md.name + ": " + s.ToString() + "\n";
+      } else if (fsize != md.size) {
+        corruption_messages += "Sst file size mismatch: " + file_path +
+                               ". Size recorded in manifest " +
+                               ToString(md.size) + ", actual size " +
+                               ToString(fsize) + "\n";
+      }
    }
  }
+
  if (corruption_messages.size() == 0) {
    return Status::OK();
  } else {
@@ -3329,31 +3394,12 @@ Status DBImpl::GetDbIdentity(std::string& identity) const {
 Status DBImpl::GetDbIdentityFromIdentityFile(std::string* identity) const {
  std::string idfilename = IdentityFileName(dbname_);
  const FileOptions soptions;
-  std::unique_ptr<SequentialFileReader> id_file_reader;
-  Status s;
-  {
-    std::unique_ptr<FSSequentialFile> idfile;
-    s = fs_->NewSequentialFile(idfilename, soptions, &idfile, nullptr);
-    if (!s.ok()) {
-      return s;
-    }
-    id_file_reader.reset(
-        new SequentialFileReader(std::move(idfile), idfilename));
+
+  Status s = ReadFileToString(fs_.get(), idfilename, identity);
+  if (!s.ok()) {
+    return s;
  }

-  uint64_t file_size;
-  s = fs_->GetFileSize(idfilename, IOOptions(), &file_size, nullptr);
-  if (!s.ok()) {
-    return s;
-  }
-  char* buffer =
-      reinterpret_cast<char*>(alloca(static_cast<size_t>(file_size)));
-  Slice id;
-  s = id_file_reader->Read(static_cast<size_t>(file_size), &id, buffer);
-  if (!s.ok()) {
-    return s;
-  }
-  identity->assign(id.ToString());
  // If last character is '\n' remove it from identity
  if (identity->size() > 0 && identity->back() == '\n') {
    identity->pop_back();
@@ -3545,6 +3591,11 @@ Status DestroyDB(const std::string& dbname, const Options& options,

    env->UnlockFile(lock);  // Ignore error since state is already gone
    env->DeleteFile(lockname);
+
+    // sst_file_manager holds a ref to the logger. Make sure the logger is
+    // gone before trying to remove the directory.
+    soptions.sst_file_manager.reset();
+
    env->DeleteDir(dbname);  // Ignore error in case dir contains other files
  }
  return result;
@@ -4325,8 +4376,8 @@ Status DBImpl::VerifyChecksum(const ReadOptions& read_options) {
        const auto& fd = vstorage->LevelFilesBrief(i).files[j].fd;
        std::string fname = TableFileName(cfd->ioptions()->cf_paths,
                                          fd.GetNumber(), fd.GetPathId());
-        s = rocksdb::VerifySstFileChecksum(opts, file_options_, read_options,
-                                           fname);
+        s = ROCKSDB_NAMESPACE::VerifySstFileChecksum(opts, file_options_,
+                                                     read_options, fname);
      }
    }
    if (!s.ok()) {
@@ -4471,13 +4522,21 @@ Status DBImpl::GetCreationTimeOfOldestFile(uint64_t* creation_time) {
  if (mutable_db_options_.max_open_files == -1) {
    uint64_t oldest_time = port::kMaxUint64;
    for (auto cfd : *versions_->GetColumnFamilySet()) {
-      uint64_t ctime;
-      cfd->current()->GetCreationTimeOfOldestFile(&ctime);
-      if (ctime < oldest_time) {
-        oldest_time = ctime;
-      }
-      if (oldest_time == 0) {
-        break;
+      if (!cfd->IsDropped()) {
+        uint64_t ctime;
+        {
+          SuperVersion* sv = GetAndRefSuperVersion(cfd);
+          Version* version = sv->current;
+          version->GetCreationTimeOfOldestFile(&ctime);
+          ReturnAndCleanupSuperVersion(cfd, sv);
+        }
+
+        if (ctime < oldest_time) {
+          oldest_time = ctime;
+        }
+        if (oldest_time == 0) {
+          break;
+        }
      }
    }
    *creation_time = oldest_time;
@@ -4488,4 +4547,4 @@ Status DBImpl::GetCreationTimeOfOldestFile(uint64_t* creation_time) {
 }
 #endif  // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -62,7 +62,7 @@
 #include "util/stop_watch.h"
 #include "util/thread_local.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class Arena;
 class ArenaWrappedDBIter;
@@ -826,7 +826,6 @@ class DBImpl : public DB {
                     std::vector<ColumnFamilyHandle*>* handles, DB** dbptr,
                     const bool seq_per_batch, const bool batch_per_txn);

-
  static Status CreateAndNewDirectory(Env* env, const std::string& dirname,
                                      std::unique_ptr<Directory>* directory);

@@ -1110,10 +1109,13 @@ class DBImpl : public DB {
  // Recover the descriptor from persistent storage.  May do a significant
  // amount of work to recover recently logged updates.  Any changes to
  // be made to the descriptor are added to *edit.
+  // recovered_seq is set to less than kMaxSequenceNumber if the log's tail is
+  // skipped.
  virtual Status Recover(
      const std::vector<ColumnFamilyDescriptor>& column_families,
      bool read_only = false, bool error_if_log_file_exist = false,
-      bool error_if_data_exists_in_logs = false);
+      bool error_if_data_exists_in_logs = false,
+      uint64_t* recovered_seq = nullptr);

  virtual bool OwnTablesAndLogs() const { return true; }

@@ -1355,8 +1357,10 @@ class DBImpl : public DB {
      JobContext* job_context, LogBuffer* log_buffer, Env::Priority thread_pri);

  // REQUIRES: log_numbers are sorted in ascending order
+  // corrupted_log_found is set to true if we recover from a corrupted log file.
  Status RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
-                         SequenceNumber* next_sequence, bool read_only);
+                         SequenceNumber* next_sequence, bool read_only,
+                         bool* corrupted_log_found);

  // The following two methods are used to flush a memtable to
  // storage. The first one is used at database RecoveryTime (when the
@@ -1379,6 +1383,7 @@ class DBImpl : public DB {
  Status ThrottleLowPriWritesIfNeeded(const WriteOptions& write_options,
                                      WriteBatch* my_batch);

+  // REQUIRES: mutex locked and in write thread.
  Status ScheduleFlushes(WriteContext* context);

  void MaybeFlushStatsCF(autovector<ColumnFamilyData*>* cfds);
@@ -1450,10 +1455,10 @@ class DBImpl : public DB {
  // REQUIRES: mutex locked and in write thread.
  void AssignAtomicFlushSeq(const autovector<ColumnFamilyData*>& cfds);

-  // REQUIRES: mutex locked
+  // REQUIRES: mutex locked and in write thread.
  Status SwitchWAL(WriteContext* write_context);

-  // REQUIRES: mutex locked
+  // REQUIRES: mutex locked and in write thread.
  Status HandleWriteBufferFull(WriteContext* write_context);

  // REQUIRES: mutex locked
@@ -2010,11 +2015,11 @@ class DBImpl : public DB {

  // handle for scheduling stats dumping at fixed intervals
  // REQUIRES: mutex locked
-  std::unique_ptr<rocksdb::RepeatableThread> thread_dump_stats_;
+  std::unique_ptr<ROCKSDB_NAMESPACE::RepeatableThread> thread_dump_stats_;

  // handle for scheduling stats snapshoting at fixed intervals
  // REQUIRES: mutex locked
-  std::unique_ptr<rocksdb::RepeatableThread> thread_persist_stats_;
+  std::unique_ptr<ROCKSDB_NAMESPACE::RepeatableThread> thread_persist_stats_;

  // When set, we use a separate queue for writes that dont write to memtable.
  // In 2PC these are the writes at Prepare phase.
@@ -2099,4 +2104,4 @@ static void ClipToRange(T* ptr, V minvalue, V maxvalue) {
  if (static_cast<V>(*ptr) < minvalue) *ptr = minvalue;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -22,7 +22,7 @@
 #include "util/cast_util.h"
 #include "util/concurrent_task_limiter_impl.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 bool DBImpl::EnoughRoomForCompaction(
    ColumnFamilyData* cfd, const std::vector<CompactionInputFiles>& inputs,
@@ -409,7 +409,7 @@ Status DBImpl::AtomicFlushMemTablesToOutputFiles(
    s = Status::OK();
  }

-  if (s.ok() || s.IsShutdownInProgress() || s.IsColumnFamilyDropped()) {
+  if (s.ok() || s.IsShutdownInProgress()) {
    // Sync on all distinct output directories.
    for (auto dir : distinct_output_dirs) {
      if (dir != nullptr) {
@@ -420,6 +420,23 @@ Status DBImpl::AtomicFlushMemTablesToOutputFiles(
        }
      }
    }
+  } else {
+    // Need to undo atomic flush if something went wrong, i.e. s is not OK and
+    // it is not because of CF drop.
+    // Have to cancel the flush jobs that have NOT executed because we need to
+    // unref the versions.
+    for (int i = 0; i != num_cfs; ++i) {
+      if (!exec_status[i].first) {
+        jobs[i]->Cancel();
+      }
+    }
+    for (int i = 0; i != num_cfs; ++i) {
+      if (exec_status[i].first && exec_status[i].second.ok()) {
+        auto& mems = jobs[i]->GetMemTables();
+        cfds[i]->imm()->RollbackMemtableFlush(mems,
+                                              file_meta[i].fd.GetNumber());
+      }
+    }
  }

  if (s.ok()) {
@@ -526,23 +543,7 @@ Status DBImpl::AtomicFlushMemTablesToOutputFiles(
 #endif  // ROCKSDB_LITE
  }

-  // Need to undo atomic flush if something went wrong, i.e. s is not OK and
-  // it is not because of CF drop.
-  if (!s.ok() && !s.IsColumnFamilyDropped()) {
-    // Have to cancel the flush jobs that have NOT executed because we need to
-    // unref the versions.
-    for (int i = 0; i != num_cfs; ++i) {
-      if (!exec_status[i].first) {
-        jobs[i]->Cancel();
-      }
-    }
-    for (int i = 0; i != num_cfs; ++i) {
-      if (exec_status[i].first && exec_status[i].second.ok()) {
-        auto& mems = jobs[i]->GetMemTables();
-        cfds[i]->imm()->RollbackMemtableFlush(mems,
-                                              file_meta[i].fd.GetNumber());
-      }
-    }
+  if (!s.ok() && !s.IsShutdownInProgress()) {
    Status new_bg_error = s;
    error_handler_.SetBGError(new_bg_error, BackgroundErrorReason::kFlush);
  }
@@ -1257,7 +1258,8 @@ Status DBImpl::ReFitLevel(ColumnFamilyData* cfd, int level, int target_level) {
                   f->fd.GetFileSize(), f->smallest, f->largest,
                   f->fd.smallest_seqno, f->fd.largest_seqno,
                   f->marked_for_compaction, f->oldest_blob_file_number,
-                   f->oldest_ancester_time, f->file_creation_time);
+                   f->oldest_ancester_time, f->file_creation_time,
+                   f->file_checksum, f->file_checksum_func_name);
    }
    ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
                    "[%s] Apply version edit:\n%s", cfd->GetName().c_str(),
@@ -2668,7 +2670,8 @@ Status DBImpl::BackgroundCompaction(bool* made_progress,
                           f->largest, f->fd.smallest_seqno,
                           f->fd.largest_seqno, f->marked_for_compaction,
                           f->oldest_blob_file_number, f->oldest_ancester_time,
-                           f->file_creation_time);
+                           f->file_creation_time, f->file_checksum,
+                           f->file_checksum_func_name);

        ROCKS_LOG_BUFFER(
            log_buffer,
@@ -3110,4 +3113,4 @@ void DBImpl::GetSnapshotContext(
  }
  *snapshot_seqs = snapshots_.GetAll(earliest_write_conflict_snapshot);
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -15,7 +15,7 @@
 #include "monitoring/thread_status_updater.h"
 #include "util/cast_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 uint64_t DBImpl::TEST_GetLevel0TotalSize() {
  InstrumentedMutexLock l(&mutex_);
  return default_cf_handle_->cfd()->current()->storage_info()->NumLevelBytes(0);
@@ -24,7 +24,9 @@ uint64_t DBImpl::TEST_GetLevel0TotalSize() {
 void DBImpl::TEST_SwitchWAL() {
  WriteContext write_context;
  InstrumentedMutexLock l(&mutex_);
+  void* writer = TEST_BeginWrite();
  SwitchWAL(&write_context);
+  TEST_EndWrite(writer);
 }

 bool DBImpl::TEST_WALBufferIsEmpty(bool lock) {
@@ -106,15 +108,18 @@ Status DBImpl::TEST_SwitchMemtable(ColumnFamilyData* cfd) {
    cfd = default_cf_handle_->cfd();
  }

+  Status s;
+  void* writer = TEST_BeginWrite();
  if (two_write_queues_) {
    WriteThread::Writer nonmem_w;
    nonmem_write_thread_.EnterUnbatched(&nonmem_w, &mutex_);
-    Status s = SwitchMemtable(cfd, &write_context);
+    s = SwitchMemtable(cfd, &write_context);
    nonmem_write_thread_.ExitUnbatched(&nonmem_w);
-    return s;
  } else {
-    return SwitchMemtable(cfd, &write_context);
+    s = SwitchMemtable(cfd, &write_context);
  }
+  TEST_EndWrite(writer);
+  return s;
 }

 Status DBImpl::TEST_FlushMemTable(bool wait, bool allow_write_stall,
@@ -285,5 +290,5 @@ bool DBImpl::TEST_IsPersistentStatsEnabled() const {
 size_t DBImpl::TEST_EstimateInMemoryStatsHistorySize() const {
  return EstimateInMemoryStatsHistorySize();
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
 #endif  // NDEBUG
@@ -17,7 +17,7 @@
 #include "db/version_set.h"
 #include "rocksdb/status.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 #ifndef ROCKSDB_LITE
 Status DBImpl::SuggestCompactRange(ColumnFamilyHandle* column_family,
@@ -129,7 +129,8 @@ Status DBImpl::PromoteL0(ColumnFamilyHandle* column_family, int target_level) {
                   f->fd.GetFileSize(), f->smallest, f->largest,
                   f->fd.smallest_seqno, f->fd.largest_seqno,
                   f->marked_for_compaction, f->oldest_blob_file_number,
-                   f->oldest_ancester_time, f->file_creation_time);
+                   f->oldest_ancester_time, f->file_creation_time,
+                   f->file_checksum, f->file_checksum_func_name);
    }

    status = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
@@ -147,4 +148,4 @@ Status DBImpl::PromoteL0(ColumnFamilyHandle* column_family, int target_level) {
 }
 #endif  // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -17,7 +17,7 @@
 #include "file/sst_file_manager_impl.h"
 #include "util/autovector.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 uint64_t DBImpl::MinLogNumberToKeep() {
  if (allow_2pc()) {
@@ -618,9 +618,9 @@ uint64_t PrecomputeMinLogNumberToKeep(
  // family being flushed (`cfd_to_flush`).
  uint64_t cf_min_log_number_to_keep = 0;
  for (auto& e : edit_list) {
-    if (e->has_log_number()) {
+    if (e->HasLogNumber()) {
      cf_min_log_number_to_keep =
-          std::max(cf_min_log_number_to_keep, e->log_number());
+          std::max(cf_min_log_number_to_keep, e->GetLogNumber());
    }
  }
  if (cf_min_log_number_to_keep == 0) {
@@ -664,4 +664,4 @@ uint64_t PrecomputeMinLogNumberToKeep(
  return min_log_number_to_keep;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -23,7 +23,7 @@
 #include "test_util/sync_point.h"
 #include "util/rate_limiter.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 Options SanitizeOptions(const std::string& dbname, const Options& src) {
  auto db_options = SanitizeOptions(dbname, DBOptions(src));
  ImmutableDBOptions immutable_db_options(db_options);
@@ -100,12 +100,11 @@ DBOptions SanitizeOptions(const std::string& dbname, const DBOptions& src) {
  if (result.recycle_log_file_num &&
      (result.wal_recovery_mode == WALRecoveryMode::kPointInTimeRecovery ||
       result.wal_recovery_mode == WALRecoveryMode::kAbsoluteConsistency)) {
-    // kPointInTimeRecovery is indistinguishable from
-    // kTolerateCorruptedTailRecords in recycle mode since we define
-    // the "end" of the log as the first corrupt record we encounter.
+    // kPointInTimeRecovery is inconsistent with recycle log file feature since
+    // we define the "end" of the log as the first corrupt record we encounter.
    // kAbsoluteConsistency doesn't make sense because even a clean
    // shutdown leaves old junk at the end of the log file.
-    result.wal_recovery_mode = WALRecoveryMode::kTolerateCorruptedTailRecords;
+    result.recycle_log_file_num = 0;
  }

  if (result.wal_dir.empty()) {
@@ -173,6 +172,13 @@ DBOptions SanitizeOptions(const std::string& dbname, const DBOptions& src) {
    result.sst_file_manager = sst_file_manager;
  }
 #endif
+
+  if (!result.paranoid_checks) {
+    result.skip_checking_sst_file_sizes_on_db_open = true;
+    ROCKS_LOG_INFO(result.info_log,
+                   "file size check will be skipped during open.");
+  }
+
  return result;
 }

@@ -345,7 +351,8 @@ Status Directories::SetDirectories(Env* env, const std::string& dbname,

 Status DBImpl::Recover(
    const std::vector<ColumnFamilyDescriptor>& column_families, bool read_only,
-    bool error_if_log_file_exist, bool error_if_data_exists_in_logs) {
+    bool error_if_log_file_exist, bool error_if_data_exists_in_logs,
+    uint64_t* recovered_seq) {
  mutex_.AssertHeld();

  bool is_new_db = false;
@@ -367,9 +374,6 @@ Status DBImpl::Recover(
    s = env_->FileExists(current_fname);
    if (s.IsNotFound()) {
      if (immutable_db_options_.create_if_missing) {
-        // Has to be called only after Identity File creation is successful
-        // because DB ID is stored in Manifest if
-        // immutable_db_options_.write_dbid_to_manifest = true
        s = NewDB();
        is_new_db = true;
        if (!s.ok()) {
@@ -435,27 +439,28 @@ Status DBImpl::Recover(
      assert(s.IsIOError());
      return s;
    }
-    GetDbIdentityFromIdentityFile(&db_id_);
-    if (immutable_db_options_.write_dbid_to_manifest) {
+    s = GetDbIdentityFromIdentityFile(&db_id_);
+    if (immutable_db_options_.write_dbid_to_manifest && s.ok()) {
      VersionEdit edit;
      edit.SetDBId(db_id_);
      Options options;
      MutableCFOptions mutable_cf_options(options);
      versions_->db_id_ = db_id_;
-      versions_->LogAndApply(versions_->GetColumnFamilySet()->GetDefault(),
+      s = versions_->LogAndApply(versions_->GetColumnFamilySet()->GetDefault(),
                             mutable_cf_options, &edit, &mutex_, nullptr,
                             false);
    }
  } else {
-    SetIdentityFile(env_, dbname_, db_id_);
+    s = SetIdentityFile(env_, dbname_, db_id_);
  }

  if (immutable_db_options_.paranoid_checks && s.ok()) {
    s = CheckConsistency();
  }
  if (s.ok() && !read_only) {
+    std::map<std::string, std::shared_ptr<Directory>> created_dirs;
    for (auto cfd : *versions_->GetColumnFamilySet()) {
-      s = cfd->AddDirectories();
+      s = cfd->AddDirectories(&created_dirs);
      if (!s.ok()) {
        return s;
      }
@@ -466,16 +471,16 @@ Status DBImpl::Recover(
    s = InitPersistStatsColumnFamily();
  }

-  // Initial max_total_in_memory_state_ before recovery logs. Log recovery
-  // may check this value to decide whether to flush.
-  max_total_in_memory_state_ = 0;
-  for (auto cfd : *versions_->GetColumnFamilySet()) {
-    auto* mutable_cf_options = cfd->GetLatestMutableCFOptions();
-    max_total_in_memory_state_ += mutable_cf_options->write_buffer_size *
-                                  mutable_cf_options->max_write_buffer_number;
-  }
-
  if (s.ok()) {
+    // Initial max_total_in_memory_state_ before recovery logs. Log recovery
+    // may check this value to decide whether to flush.
+    max_total_in_memory_state_ = 0;
+    for (auto cfd : *versions_->GetColumnFamilySet()) {
+      auto* mutable_cf_options = cfd->GetLatestMutableCFOptions();
+      max_total_in_memory_state_ += mutable_cf_options->write_buffer_size *
+                                    mutable_cf_options->max_write_buffer_number;
+    }
+
    SequenceNumber next_sequence(kMaxSequenceNumber);
    default_cf_handle_ = new ColumnFamilyHandleImpl(
        versions_->GetColumnFamilySet()->GetDefault(), this, &mutex_);
@@ -541,7 +546,12 @@ Status DBImpl::Recover(
    if (!logs.empty()) {
      // Recover in the order in which the logs were generated
      std::sort(logs.begin(), logs.end());
-      s = RecoverLogFiles(logs, &next_sequence, read_only);
+      bool corrupted_log_found = false;
+      s = RecoverLogFiles(logs, &next_sequence, read_only,
+                          &corrupted_log_found);
+      if (corrupted_log_found && recovered_seq != nullptr) {
+        *recovered_seq = next_sequence;
+      }
      if (!s.ok()) {
        // Clear memtables if recovery failed
        for (auto cfd : *versions_->GetColumnFamilySet()) {
@@ -671,7 +681,8 @@ Status DBImpl::InitPersistStatsColumnFamily() {

 // REQUIRES: log_numbers are sorted in ascending order
 Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
-                               SequenceNumber* next_sequence, bool read_only) {
+                               SequenceNumber* next_sequence, bool read_only,
+                               bool* corrupted_log_found) {
  struct LogReporter : public log::Reader::Reporter {
    Env* env;
    Logger* info_log;
@@ -973,6 +984,9 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
        status = Status::OK();
        stop_replay_for_corruption = true;
        corrupted_log_number = log_number;
+        if (corrupted_log_found != nullptr) {
+          *corrupted_log_found = true;
+        }
        ROCKS_LOG_INFO(immutable_db_options_.info_log,
                       "Point in time recovered to log #%" PRIu64
                       " seq #%" PRIu64,
@@ -1001,6 +1015,9 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
  // the corrupted log number, which means CF contains data beyond the point of
  // corruption. This could during PIT recovery when the WAL is corrupted and
  // some (but not all) CFs are flushed
+  // Exclude the PIT case where no log is dropped after the corruption point.
+  // This is to cover the case for empty logs after corrupted log, in which we
+  // don't reset stop_replay_for_corruption.
  if (stop_replay_for_corruption == true &&
      (immutable_db_options_.wal_recovery_mode ==
           WALRecoveryMode::kPointInTimeRecovery ||
@@ -1242,7 +1259,8 @@ Status DBImpl::WriteLevel0TableForRecovery(int job_id, ColumnFamilyData* cfd,
                  meta.fd.GetFileSize(), meta.smallest, meta.largest,
                  meta.fd.smallest_seqno, meta.fd.largest_seqno,
                  meta.marked_for_compaction, meta.oldest_blob_file_number,
-                  meta.oldest_ancester_time, meta.file_creation_time);
+                  meta.oldest_ancester_time, meta.file_creation_time,
+                  meta.file_checksum, meta.file_checksum_func_name);
  }

  InternalStats::CompactionStats stats(CompactionReason::kFlush, 1);
@@ -1311,6 +1329,8 @@ Status DBImpl::CreateWAL(uint64_t log_file_num, uint64_t recycle_log_number,
                   recycle_log_number);
    std::string old_log_fname =
        LogFileName(immutable_db_options_.wal_dir, recycle_log_number);
+    TEST_SYNC_POINT("DBImpl::CreateWAL:BeforeReuseWritableFile1");
+    TEST_SYNC_POINT("DBImpl::CreateWAL:BeforeReuseWritableFile2");
    s = fs_->ReuseWritableFile(log_fname, old_log_fname, opt_file_options,
                               &lfile, /*dbg=*/nullptr);
  } else {
@@ -1396,7 +1416,8 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,

  impl->mutex_.Lock();
  // Handles create_if_missing, error_if_exists
-  s = impl->Recover(column_families);
+  uint64_t recovered_seq(kMaxSequenceNumber);
+  s = impl->Recover(column_families, false, false, false, &recovered_seq);
  if (s.ok()) {
    uint64_t new_log_number = impl->versions_->NewFileNumber();
    log::Writer* new_log = nullptr;
@@ -1454,9 +1475,36 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
      if (impl->two_write_queues_) {
        impl->log_write_mutex_.Unlock();
      }
+
      impl->DeleteObsoleteFiles();
      s = impl->directories_.GetDbDir()->Fsync();
    }
+    if (s.ok()) {
+      // In WritePrepared there could be gap in sequence numbers. This breaks
+      // the trick we use in kPointInTimeRecovery which assumes the first seq in
+      // the log right after the corrupted log is one larger than the last seq
+      // we read from the logs. To let this trick keep working, we add a dummy
+      // entry with the expected sequence to the first log right after recovery.
+      // In non-WritePrepared case also the new log after recovery could be
+      // empty, and thus missing the consecutive seq hint to distinguish
+      // middle-log corruption to corrupted-log-remained-after-recovery. This
+      // case also will be addressed by a dummy write.
+      if (recovered_seq != kMaxSequenceNumber) {
+        WriteBatch empty_batch;
+        WriteBatchInternal::SetSequence(&empty_batch, recovered_seq);
+        WriteOptions write_options;
+        uint64_t log_used, log_size;
+        log::Writer* log_writer = impl->logs_.back().writer;
+        s = impl->WriteToWAL(empty_batch, log_writer, &log_used, &log_size);
+        if (s.ok()) {
+          // Need to fsync, otherwise it might get lost after a power reset.
+          s = impl->FlushWAL(false);
+          if (s.ok()) {
+            s = log_writer->file()->Sync(impl->immutable_db_options_.use_fsync);
+          }
+        }
+      }
+    }
  }
  if (s.ok() && impl->immutable_db_options_.persist_stats_to_disk) {
    // try to read format version but no need to fail Open() even if it fails
@@ -1512,6 +1560,27 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
  if (s.ok() && sfm) {
    // Notify SstFileManager about all sst files that already exist in
    // db_paths[0] and cf_paths[0] when the DB is opened.
+
+    // SstFileManagerImpl needs to know sizes of the files. For files whose size
+    // we already know (sst files that appear in manifest - typically that's the
+    // vast majority of all files), we'll pass the size to SstFileManager.
+    // For all other files SstFileManager will query the size from filesystem.
+
+    std::vector<LiveFileMetaData> metadata;
+
+    impl->mutex_.Lock();
+    impl->versions_->GetLiveFilesMetaData(&metadata);
+    impl->mutex_.Unlock();
+
+    std::unordered_map<std::string, uint64_t> known_file_sizes;
+    for (const auto& md : metadata) {
+      std::string name = md.name;
+      if (!name.empty() && name[0] == '/') {
+        name = name.substr(1);
+      }
+      known_file_sizes[name] = md.size;
+    }
+
    std::vector<std::string> paths;
    paths.emplace_back(impl->immutable_db_options_.db_paths[0].path);
    for (auto& cf : column_families) {
@@ -1531,7 +1600,14 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
        std::string file_path = path + "/" + file_name;
        if (ParseFileName(file_name, &file_number, &file_type) &&
            file_type == kTableFile) {
-          sfm->OnAddFile(file_path);
+          if (known_file_sizes.count(file_name)) {
+            // We're assuming that each sst file name exists in at most one of
+            // the paths.
+            sfm->OnAddFile(file_path, known_file_sizes.at(file_name),
+                           /* compaction */ false);
+          } else {
+            sfm->OnAddFile(file_path);
+          }
        }
      }
    }
@@ -1572,4 +1648,4 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
  }
  return s;
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -12,7 +12,7 @@
 #include "db/merge_context.h"
 #include "monitoring/perf_context_imp.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 #ifndef ROCKSDB_LITE

@@ -218,4 +218,4 @@ Status DB::OpenForReadOnly(
 }
 #endif  // !ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -11,7 +11,7 @@
 #include <vector>
 #include "db/db_impl/db_impl.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBImplReadOnly : public DBImpl {
 public:
@@ -132,6 +132,6 @@ class DBImplReadOnly : public DBImpl {
 private:
  friend class DB;
 };
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // !ROCKSDB_LITE
@@ -13,7 +13,7 @@
 #include "monitoring/perf_context_imp.h"
 #include "util/cast_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 #ifndef ROCKSDB_LITE
 DBImplSecondary::DBImplSecondary(const DBOptions& db_options,
@@ -29,7 +29,7 @@ DBImplSecondary::~DBImplSecondary() {}
 Status DBImplSecondary::Recover(
    const std::vector<ColumnFamilyDescriptor>& column_families,
    bool /*readonly*/, bool /*error_if_log_file_exist*/,
-    bool /*error_if_data_exists_in_logs*/) {
+    bool /*error_if_data_exists_in_logs*/, uint64_t*) {
  mutex_.AssertHeld();

  JobContext job_context(0);
@@ -468,6 +468,11 @@ Status DBImplSecondary::CheckConsistency() {
  // approach and just proceed.
  TEST_SYNC_POINT_CALLBACK(
      "DBImplSecondary::CheckConsistency:AfterFirstAttempt", &s);
+
+  if (immutable_db_options_.skip_checking_sst_file_sizes_on_db_open) {
+    return Status::OK();
+  }
+
  std::vector<LiveFileMetaData> metadata;
  versions_->GetLiveFilesMetaData(&metadata);

@@ -663,4 +668,4 @@ Status DB::OpenAsSecondary(
 }
 #endif  // !ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -11,7 +11,7 @@
 #include <vector>
 #include "db/db_impl/db_impl.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // A wrapper class to hold log reader, log reporter, log status.
 class LogReaderContainer {
@@ -78,7 +78,8 @@ class DBImplSecondary : public DBImpl {
  // and log_readers_ to facilitate future operations.
  Status Recover(const std::vector<ColumnFamilyDescriptor>& column_families,
                 bool read_only, bool error_if_log_file_exist,
-                 bool error_if_data_exists_in_logs) override;
+                 bool error_if_data_exists_in_logs,
+                 uint64_t* = nullptr) override;

  // Implementations of the DB interface
  using DB::Get;
@@ -327,6 +328,6 @@ class DBImplSecondary : public DBImpl {
  std::unordered_map<ColumnFamilyData*, uint64_t> cfd_to_current_log_;
 };

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // !ROCKSDB_LITE
@@ -15,7 +15,7 @@
 #include "options/options_helper.h"
 #include "test_util/sync_point.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 // Convenience methods
 Status DBImpl::Put(const WriteOptions& o, ColumnFamilyHandle* column_family,
                   const Slice& key, const Slice& val) {
@@ -1292,7 +1292,7 @@ Status DBImpl::HandleWriteBufferFull(WriteContext* write_context) {
  // suboptimal but still correct.
  ROCKS_LOG_INFO(
      immutable_db_options_.info_log,
-      "Flushing column family with largest mem table size. Write buffer is "
+      "Flushing column family with oldest memtable entry. Write buffer is "
      "using %" ROCKSDB_PRIszt " bytes out of a total of %" ROCKSDB_PRIszt ".",
      write_buffer_manager_->memory_usage(),
      write_buffer_manager_->buffer_size());
@@ -1458,7 +1458,7 @@ Status DBImpl::ThrottleLowPriWritesIfNeeded(const WriteOptions& write_options,
      return Status::OK();
    }
    if (write_options.no_slowdown) {
-      return Status::Incomplete();
+      return Status::Incomplete("Low priority write stall");
    } else {
      assert(my_batch != nullptr);
      // Rate limit those writes. The reason that we don't completely wait
@@ -1631,7 +1631,6 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
  if (creating_new_log && immutable_db_options_.recycle_log_file_num &&
      !log_recycle_files_.empty()) {
    recycle_log_number = log_recycle_files_.front();
-    log_recycle_files_.pop_front();
  }
  uint64_t new_log_number =
      creating_new_log ? versions_->NewFileNumber() : logfile_number_;
@@ -1668,6 +1667,14 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
                 ". Immutable memtables: %d.\n",
                 cfd->GetName().c_str(), new_log_number, num_imm_unflushed);
  mutex_.Lock();
+  if (recycle_log_number != 0) {
+    // Since renaming the file is done outside DB mutex, we need to ensure
+    // concurrent full purges don't delete the file while we're recycling it.
+    // To achieve that we hold the old log number in the recyclable list until
+    // after it has been renamed.
+    assert(log_recycle_files_.front() == recycle_log_number);
+    log_recycle_files_.pop_front();
+  }
  if (s.ok() && creating_new_log) {
    log_write_mutex_.Lock();
    assert(new_log != nullptr);
@@ -1829,4 +1836,4 @@ Status DB::Merge(const WriteOptions& opt, ColumnFamilyHandle* column_family,
  }
  return Write(opt, &batch);
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -13,7 +13,7 @@
 #include "test_util/fault_injection_test_env.h"
 #include "test_util/sync_point.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 #ifndef ROCKSDB_LITE
 class DBSecondaryTest : public DBTestBase {
@@ -860,10 +860,10 @@ TEST_F(DBSecondaryTest, CheckConsistencyWhenOpen) {
 }
 #endif  //! ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -14,7 +14,7 @@
 #include "file/filename.h"
 #include "rocksdb/env.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 void DumpDBFileSummary(const ImmutableDBOptions& options,
                       const std::string& dbname) {
@@ -120,4 +120,4 @@ void DumpDBFileSummary(const ImmutableDBOptions& options,
  Header(options.info_log, "Write Ahead Log file in %s: %s\n",
         options.wal_dir.c_str(), wal_info.c_str());
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -8,7 +8,7 @@

 #include "options/db_options.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {
 void DumpDBFileSummary(const ImmutableDBOptions& options,
                       const std::string& dbname);
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -9,7 +9,7 @@
 #include "db/db_test_util.h"
 #include "port/stack_trace.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBTestInPlaceUpdate : public DBTestBase {
 public:
@@ -73,7 +73,7 @@ TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackSmallerSize) {
    options.env = env_;
    options.write_buffer_size = 100000;
    options.inplace_callback =
-      rocksdb::DBTestInPlaceUpdate::updateInPlaceSmallerSize;
+        ROCKSDB_NAMESPACE::DBTestInPlaceUpdate::updateInPlaceSmallerSize;
    options.allow_concurrent_memtable_write = false;
    Reopen(options);
    CreateAndReopenWithCF({"pikachu"}, options);
@@ -102,7 +102,7 @@ TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackSmallerVarintSize) {
    options.env = env_;
    options.write_buffer_size = 100000;
    options.inplace_callback =
-      rocksdb::DBTestInPlaceUpdate::updateInPlaceSmallerVarintSize;
+        ROCKSDB_NAMESPACE::DBTestInPlaceUpdate::updateInPlaceSmallerVarintSize;
    options.allow_concurrent_memtable_write = false;
    Reopen(options);
    CreateAndReopenWithCF({"pikachu"}, options);
@@ -131,7 +131,7 @@ TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackLargeNewValue) {
    options.env = env_;
    options.write_buffer_size = 100000;
    options.inplace_callback =
-      rocksdb::DBTestInPlaceUpdate::updateInPlaceLargerSize;
+        ROCKSDB_NAMESPACE::DBTestInPlaceUpdate::updateInPlaceLargerSize;
    options.allow_concurrent_memtable_write = false;
    Reopen(options);
    CreateAndReopenWithCF({"pikachu"}, options);
@@ -158,7 +158,7 @@ TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackNoAction) {
    options.env = env_;
    options.write_buffer_size = 100000;
    options.inplace_callback =
-        rocksdb::DBTestInPlaceUpdate::updateInPlaceNoAction;
+        ROCKSDB_NAMESPACE::DBTestInPlaceUpdate::updateInPlaceNoAction;
    options.allow_concurrent_memtable_write = false;
    Reopen(options);
    CreateAndReopenWithCF({"pikachu"}, options);
@@ -168,10 +168,10 @@ TEST_F(DBTestInPlaceUpdate, InPlaceUpdateCallbackNoAction) {
    ASSERT_EQ(Get(1, "key"), "NOT_FOUND");
  } while (ChangeCompactOptions());
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -10,7 +10,7 @@
 #include "db/db_test_util.h"
 #include "port/stack_trace.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBIOFailureTest : public DBTestBase {
 public:
@@ -270,14 +270,14 @@ TEST_F(DBIOFailureTest, FlushSstRangeSyncError) {
  Status s;

  std::atomic<int> range_sync_called(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SpecialEnv::SStableFile::RangeSync", [&](void* arg) {
        if (range_sync_called.fetch_add(1) == 0) {
          Status* st = static_cast<Status*>(arg);
          *st = Status::IOError("range sync dummy error");
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);
  std::string rnd_str =
@@ -302,7 +302,7 @@ TEST_F(DBIOFailureTest, FlushSstRangeSyncError) {
  ASSERT_NOK(Put(1, "foo2", "bar3"));
  ASSERT_EQ("bar", Get(1, "foo"));

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  ASSERT_GE(1, range_sync_called.load());

  ReopenWithColumnFamilies({"default", "pikachu"}, options);
@@ -350,14 +350,14 @@ TEST_F(DBIOFailureTest, CompactSstRangeSyncError) {
  dbfull()->TEST_WaitForFlushMemTable(handles_[1]);

  std::atomic<int> range_sync_called(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SpecialEnv::SStableFile::RangeSync", [&](void* arg) {
        if (range_sync_called.fetch_add(1) == 0) {
          Status* st = static_cast<Status*>(arg);
          *st = Status::IOError("range sync dummy error");
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  ASSERT_OK(dbfull()->SetOptions(handles_[1],
                                 {
@@ -369,7 +369,7 @@ TEST_F(DBIOFailureTest, CompactSstRangeSyncError) {
  ASSERT_NOK(Put(1, "foo2", "bar3"));
  ASSERT_EQ("bar", Get(1, "foo"));

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  ASSERT_GE(1, range_sync_called.load());

  ReopenWithColumnFamilies({"default", "pikachu"}, options);
@@ -389,7 +389,7 @@ TEST_F(DBIOFailureTest, FlushSstCloseError) {
  CreateAndReopenWithCF({"pikachu"}, options);
  Status s;
  std::atomic<int> close_called(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SpecialEnv::SStableFile::Close", [&](void* arg) {
        if (close_called.fetch_add(1) == 0) {
          Status* st = static_cast<Status*>(arg);
@@ -397,7 +397,7 @@ TEST_F(DBIOFailureTest, FlushSstCloseError) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  ASSERT_OK(Put(1, "foo", "bar"));
  ASSERT_OK(Put(1, "foo1", "bar1"));
@@ -409,7 +409,7 @@ TEST_F(DBIOFailureTest, FlushSstCloseError) {
  ASSERT_EQ("bar2", Get(1, "foo"));
  ASSERT_EQ("bar1", Get(1, "foo1"));

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  ReopenWithColumnFamilies({"default", "pikachu"}, options);
  ASSERT_EQ("bar2", Get(1, "foo"));
@@ -441,7 +441,7 @@ TEST_F(DBIOFailureTest, CompactionSstCloseError) {
  dbfull()->TEST_WaitForCompact();

  std::atomic<int> close_called(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SpecialEnv::SStableFile::Close", [&](void* arg) {
        if (close_called.fetch_add(1) == 0) {
          Status* st = static_cast<Status*>(arg);
@@ -449,7 +449,7 @@ TEST_F(DBIOFailureTest, CompactionSstCloseError) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  ASSERT_OK(dbfull()->SetOptions(handles_[1],
                                 {
                                     {"disable_auto_compactions", "false"},
@@ -460,7 +460,7 @@ TEST_F(DBIOFailureTest, CompactionSstCloseError) {
  ASSERT_NOK(Put(1, "foo2", "bar3"));
  ASSERT_EQ("bar3", Get(1, "foo"));

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  ReopenWithColumnFamilies({"default", "pikachu"}, options);
  ASSERT_EQ("bar3", Get(1, "foo"));
@@ -480,7 +480,7 @@ TEST_F(DBIOFailureTest, FlushSstSyncError) {
  CreateAndReopenWithCF({"pikachu"}, options);
  Status s;
  std::atomic<int> sync_called(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SpecialEnv::SStableFile::Sync", [&](void* arg) {
        if (sync_called.fetch_add(1) == 0) {
          Status* st = static_cast<Status*>(arg);
@@ -488,7 +488,7 @@ TEST_F(DBIOFailureTest, FlushSstSyncError) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  ASSERT_OK(Put(1, "foo", "bar"));
  ASSERT_OK(Put(1, "foo1", "bar1"));
@@ -500,7 +500,7 @@ TEST_F(DBIOFailureTest, FlushSstSyncError) {
  ASSERT_EQ("bar2", Get(1, "foo"));
  ASSERT_EQ("bar1", Get(1, "foo1"));

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  ReopenWithColumnFamilies({"default", "pikachu"}, options);
  ASSERT_EQ("bar2", Get(1, "foo"));
@@ -533,7 +533,7 @@ TEST_F(DBIOFailureTest, CompactionSstSyncError) {
  dbfull()->TEST_WaitForCompact();

  std::atomic<int> sync_called(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SpecialEnv::SStableFile::Sync", [&](void* arg) {
        if (sync_called.fetch_add(1) == 0) {
          Status* st = static_cast<Status*>(arg);
@@ -541,7 +541,7 @@ TEST_F(DBIOFailureTest, CompactionSstSyncError) {
        }
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  ASSERT_OK(dbfull()->SetOptions(handles_[1],
                                 {
                                     {"disable_auto_compactions", "false"},
@@ -552,17 +552,17 @@ TEST_F(DBIOFailureTest, CompactionSstSyncError) {
  ASSERT_NOK(Put(1, "foo2", "bar3"));
  ASSERT_EQ("bar3", Get(1, "foo"));

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  ReopenWithColumnFamilies({"default", "pikachu"}, options);
  ASSERT_EQ("bar3", Get(1, "foo"));
 }
 #endif  // !(defined NDEBUG) || !defined(OS_WIN)
 #endif  // ROCKSDB_LITE
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -31,20 +31,7 @@
 #include "util/string_util.h"
 #include "util/user_comparator_wrapper.h"

-namespace rocksdb {
-
-#if 0
-static void DumpInternalIter(Iterator* iter) {
-  for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
-    ParsedInternalKey k;
-    if (!ParseInternalKey(iter->key(), &k)) {
-      fprintf(stderr, "Corrupt '%s'\n", EscapeString(iter->key()).c_str());
-    } else {
-      fprintf(stderr, "@ '%s'\n", k.DebugString().c_str());
-    }
-  }
-}
-#endif
+namespace ROCKSDB_NAMESPACE {

 DBIter::DBIter(Env* _env, const ReadOptions& read_options,
               const ImmutableCFOptions& cf_options,
@@ -73,7 +60,9 @@ DBIter::DBIter(Env* _env, const ReadOptions& read_options,
                                ? read_options.prefix_same_as_start
                                : false),
      pin_thru_lifetime_(read_options.pin_data),
-      total_order_seek_(read_options.total_order_seek),
+      expect_total_order_inner_iter_(prefix_extractor_ == nullptr ||
+                                     read_options.total_order_seek ||
+                                     read_options.auto_prefix_mode),
      allow_blob_(allow_blob),
      is_blob_(false),
      arena_mode_(arena_mode),
@@ -181,7 +170,7 @@ void DBIter::Next() {
 //       a delete marker or a sequence number higher than sequence_
 //       saved_key_ MUST have a proper user_key before calling this function
 //
-// The prefix parameter, if not null, indicates that we need to iterator
+// The prefix parameter, if not null, indicates that we need to iterate
 // within the prefix, and the iterator needs to be made invalid, if no
 // more entry for the prefix can be found.
 bool DBIter::FindNextUserEntry(bool skipping_saved_key, const Slice* prefix) {
@@ -202,13 +191,14 @@ bool DBIter::FindNextUserEntryInternal(bool skipping_saved_key,
  // or equal to saved_key_. We could skip these entries either because
  // sequence numbers were too high or because skipping_saved_key = true.
  // What saved_key_ contains throughout this method:
-  //  - if skipping_saved_key        : saved_key_ contains the key that we need
-  //  to skip,
-  //                         and we haven't seen any keys greater than that,
-  //  - if num_skipped > 0 : saved_key_ contains the key that we have skipped
-  //                         num_skipped times, and we haven't seen any keys
-  //                         greater than that,
-  //  - none of the above  : saved_key_ can contain anything, it doesn't matter.
+  //  - if skipping_saved_key : saved_key_ contains the key that we need
+  //                            to skip, and we haven't seen any keys greater
+  //                            than that,
+  //  - if num_skipped > 0    : saved_key_ contains the key that we have skipped
+  //                            num_skipped times, and we haven't seen any keys
+  //                            greater than that,
+  //  - none of the above     : saved_key_ can contain anything, it doesn't
+  //                            matter.
  uint64_t num_skipped = 0;
  // For write unprepared, the target sequence number in reseek could be larger
  // than the snapshot, and thus needs to be skipped again. This could result in
@@ -290,9 +280,7 @@ bool DBIter::FindNextUserEntryInternal(bool skipping_saved_key,
            if (start_seqnum_ > 0) {
              // we are taking incremental snapshot here
              // incremental snapshots aren't supported on DB with range deletes
-              assert(!(
-                (ikey_.type == kTypeBlobIndex) && (start_seqnum_ > 0)
-              ));
+              assert(ikey_.type != kTypeBlobIndex);
              if (ikey_.sequence >= start_seqnum_) {
                saved_key_.SetInternalKey(ikey_);
                valid_ = true;
@@ -323,7 +311,7 @@ bool DBIter::FindNextUserEntryInternal(bool skipping_saved_key,
                  ROCKS_LOG_ERROR(logger_, "Encounter unexpected blob index.");
                  status_ = Status::NotSupported(
                      "Encounter unexpected blob index. Please open DB with "
-                      "rocksdb::blob_db::BlobDB instead.");
+                      "ROCKSDB_NAMESPACE::blob_db::BlobDB instead.");
                  valid_ = false;
                  return false;
                }
@@ -370,7 +358,7 @@ bool DBIter::FindNextUserEntryInternal(bool skipping_saved_key,
      // to seek to the target sequence number.
      int cmp =
          user_comparator_.Compare(ikey_.user_key, saved_key_.GetUserKey());
-      if (cmp == 0 || (skipping_saved_key && cmp <= 0)) {
+      if (cmp == 0 || (skipping_saved_key && cmp < 0)) {
        num_skipped++;
      } else {
        saved_key_.SetUserKey(
@@ -389,7 +377,7 @@ bool DBIter::FindNextUserEntryInternal(bool skipping_saved_key,
    // reseek previously.
    //
    // TODO(lth): If we reseek to sequence number greater than ikey_.sequence,
-    // than it does not make sense to reseek as we would actually land further
+    // then it does not make sense to reseek as we would actually land further
    // away from the desired key. There is opportunity for optimization here.
    if (num_skipped > max_skip_ && !reseek_done) {
      is_key_seqnum_zero_ = false;
@@ -495,7 +483,7 @@ bool DBIter::MergeValuesNewToOld() {
        ROCKS_LOG_ERROR(logger_, "Encounter unexpected blob index.");
        status_ = Status::NotSupported(
            "Encounter unexpected blob index. Please open DB with "
-            "rocksdb::blob_db::BlobDB instead.");
+            "ROCKSDB_NAMESPACE::blob_db::BlobDB instead.");
      } else {
        status_ =
            Status::NotSupported("Blob DB does not support merge operator.");
@@ -567,7 +555,7 @@ bool DBIter::ReverseToForward() {
  // When moving backwards, iter_ is positioned on _previous_ key, which may
  // not exist or may have different prefix than the current key().
  // If that's the case, seek iter_ to current key.
-  if ((prefix_extractor_ != nullptr && !total_order_seek_) || !iter_.Valid()) {
+  if (!expect_total_order_inner_iter() || !iter_.Valid()) {
    IterKey last_key;
    last_key.SetInternalKey(ParsedInternalKey(
        saved_key_.GetUserKey(), kMaxSequenceNumber, kValueTypeForSeek));
@@ -603,15 +591,14 @@ bool DBIter::ReverseToBackward() {
  // key, which may not exist or may have prefix different from current.
  // If that's the case, seek to saved_key_.
  if (current_entry_is_merged_ &&
-      ((prefix_extractor_ != nullptr && !total_order_seek_) ||
-       !iter_.Valid())) {
+      (!expect_total_order_inner_iter() || !iter_.Valid())) {
    IterKey last_key;
    // Using kMaxSequenceNumber and kValueTypeForSeek
    // (not kValueTypeForSeekForPrev) to seek to a key strictly smaller
    // than saved_key_.
    last_key.SetInternalKey(ParsedInternalKey(
        saved_key_.GetUserKey(), kMaxSequenceNumber, kValueTypeForSeek));
-    if (prefix_extractor_ != nullptr && !total_order_seek_) {
+    if (!expect_total_order_inner_iter()) {
      iter_.SeekForPrev(last_key.GetInternalKey());
    } else {
      // Some iterators may not support SeekForPrev(), so we avoid using it
@@ -797,7 +784,7 @@ bool DBIter::FindValueForCurrentKey() {
          ROCKS_LOG_ERROR(logger_, "Encounter unexpected blob index.");
          status_ = Status::NotSupported(
              "Encounter unexpected blob index. Please open DB with "
-              "rocksdb::blob_db::BlobDB instead.");
+              "ROCKSDB_NAMESPACE::blob_db::BlobDB instead.");
        } else {
          status_ =
              Status::NotSupported("Blob DB does not support merge operator.");
@@ -820,7 +807,7 @@ bool DBIter::FindValueForCurrentKey() {
        ROCKS_LOG_ERROR(logger_, "Encounter unexpected blob index.");
        status_ = Status::NotSupported(
            "Encounter unexpected blob index. Please open DB with "
-            "rocksdb::blob_db::BlobDB instead.");
+            "ROCKSDB_NAMESPACE::blob_db::BlobDB instead.");
        valid_ = false;
        return false;
      }
@@ -891,7 +878,7 @@ bool DBIter::FindValueForCurrentKeyUsingSeek() {
    ROCKS_LOG_ERROR(logger_, "Encounter unexpected blob index.");
    status_ = Status::NotSupported(
        "Encounter unexpected blob index. Please open DB with "
-        "rocksdb::blob_db::BlobDB instead.");
+        "ROCKSDB_NAMESPACE::blob_db::BlobDB instead.");
    valid_ = false;
    return false;
  }
@@ -953,7 +940,7 @@ bool DBIter::FindValueForCurrentKeyUsingSeek() {
        ROCKS_LOG_ERROR(logger_, "Encounter unexpected blob index.");
        status_ = Status::NotSupported(
            "Encounter unexpected blob index. Please open DB with "
-            "rocksdb::blob_db::BlobDB instead.");
+            "ROCKSDB_NAMESPACE::blob_db::BlobDB instead.");
      } else {
        status_ =
            Status::NotSupported("Blob DB does not support merge operator.");
@@ -978,8 +965,8 @@ bool DBIter::FindValueForCurrentKeyUsingSeek() {
  // Make sure we leave iter_ in a good state. If it's valid and we don't care
  // about prefixes, that's already good enough. Otherwise it needs to be
  // seeked to the current key.
-  if ((prefix_extractor_ != nullptr && !total_order_seek_) || !iter_.Valid()) {
-    if (prefix_extractor_ != nullptr && !total_order_seek_) {
+  if (!expect_total_order_inner_iter() || !iter_.Valid()) {
+    if (!expect_total_order_inner_iter()) {
      iter_.SeekForPrev(last_key);
    } else {
      iter_.Seek(last_key);
@@ -1129,18 +1116,16 @@ void DBIter::Seek(const Slice& target) {

  // Now the inner iterator is placed to the target position. From there,
  // we need to find out the next key that is visible to the user.
-  //
  ClearSavedValue();
  if (prefix_same_as_start_) {
    // The case where the iterator needs to be invalidated if it has exausted
    // keys within the same prefix of the seek key.
    assert(prefix_extractor_ != nullptr);
-    Slice target_prefix;
-    target_prefix = prefix_extractor_->Transform(target);
+    Slice target_prefix = prefix_extractor_->Transform(target);
    FindNextUserEntry(false /* not skipping saved_key */,
                      &target_prefix /* prefix */);
    if (valid_) {
-      // Remember the prefix of the seek key for the future Prev() call to
+      // Remember the prefix of the seek key for the future Next() call to
      // check.
      prefix_.SetUserKey(target_prefix);
    }
@@ -1196,8 +1181,7 @@ void DBIter::SeekForPrev(const Slice& target) {
    // The case where the iterator needs to be invalidated if it has exausted
    // keys within the same prefix of the seek key.
    assert(prefix_extractor_ != nullptr);
-    Slice target_prefix;
-    target_prefix = prefix_extractor_->Transform(target);
+    Slice target_prefix = prefix_extractor_->Transform(target);
    PrevInternal(&target_prefix);
    if (valid_) {
      // Remember the prefix of the seek key for the future Prev() call to
@@ -1224,7 +1208,7 @@ void DBIter::SeekToFirst() {
  PERF_CPU_TIMER_GUARD(iter_seek_cpu_nanos, env_);
  // Don't use iter_::Seek() if we set a prefix extractor
  // because prefix seek will be used.
-  if (prefix_extractor_ != nullptr && !total_order_seek_) {
+  if (!expect_total_order_inner_iter()) {
    max_skip_ = std::numeric_limits<uint64_t>::max();
  }
  status_ = Status::OK();
@@ -1277,7 +1261,7 @@ void DBIter::SeekToLast() {
  PERF_CPU_TIMER_GUARD(iter_seek_cpu_nanos, env_);
  // Don't use iter_::Seek() if we set a prefix extractor
  // because prefix seek will be used.
-  if (prefix_extractor_ != nullptr && !total_order_seek_) {
+  if (!expect_total_order_inner_iter()) {
    max_skip_ = std::numeric_limits<uint64_t>::max();
  }
  status_ = Status::OK();
@@ -1323,4 +1307,4 @@ Iterator* NewDBIterator(Env* env, const ReadOptions& read_options,
  return db_iter;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -20,15 +20,15 @@
 #include "table/iterator_wrapper.h"
 #include "util/autovector.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // This file declares the factory functions of DBIter, in its original form
 // or a wrapped form with class ArenaWrappedDBIter, which is defined here.
 // Class DBIter, which is declared and implemented inside db_iter.cc, is
-// a iterator that converts internal keys (yielded by an InternalIterator)
+// an iterator that converts internal keys (yielded by an InternalIterator)
 // that were live at the specified sequence number into appropriate user
 // keys.
-// Each internal key is consist of a user key, a sequence number, and a value
+// Each internal key consists of a user key, a sequence number, and a value
 // type. DBIter deals with multiple key versions, tombstones, merge operands,
 // etc, and exposes an Iterator.
 // For example, DBIter may wrap following InternalIterator:
@@ -133,14 +133,12 @@ class DBIter final : public Iterator {
    local_stats_.BumpGlobalStatistics(statistics_);
    iter_.DeleteIter(arena_mode_);
  }
-  virtual void SetIter(InternalIterator* iter) {
+  void SetIter(InternalIterator* iter) {
    assert(iter_.iter() == nullptr);
    iter_.Set(iter);
    iter_.iter()->SetPinnedItersMgr(&pinned_iters_mgr_);
  }
-  virtual ReadRangeDelAggregator* GetRangeDelAggregator() {
-    return &range_del_agg_;
-  }
+  ReadRangeDelAggregator* GetRangeDelAggregator() { return &range_del_agg_; }

  bool Valid() const override { return valid_; }
  Slice key() const override {
@@ -184,7 +182,7 @@ class DBIter final : public Iterator {
  void SeekForPrev(const Slice& target) final override;
  void SeekToFirst() final override;
  void SeekToLast() final override;
-  Env* env() { return env_; }
+  Env* env() const { return env_; }
  void set_sequence(uint64_t s) {
    sequence_ = s;
    if (read_callback_) {
@@ -202,10 +200,10 @@ class DBIter final : public Iterator {
  bool ReverseToBackward();
  // Set saved_key_ to the seek key to target, with proper sequence number set.
  // It might get adjusted if the seek key is smaller than iterator lower bound.
-  void SetSavedKeyToSeekTarget(const Slice& /*target*/);
+  void SetSavedKeyToSeekTarget(const Slice& target);
  // Set saved_key_ to the seek key to target, with proper sequence number set.
  // It might get adjusted if the seek key is larger than iterator upper bound.
-  void SetSavedKeyToSeekForPrevTarget(const Slice& /*target*/);
+  void SetSavedKeyToSeekForPrevTarget(const Slice& target);
  bool FindValueForCurrentKey();
  bool FindValueForCurrentKeyUsingSeek();
  bool FindUserKeyBeforeSavedKey();
@@ -221,7 +219,7 @@ class DBIter final : public Iterator {

  // If prefix is not null, we need to set the iterator to invalid if no more
  // entry can be found within the prefix.
-  void PrevInternal(const Slice* /*prefix*/);
+  void PrevInternal(const Slice* prefix);
  bool TooManyInternalKeysSkipped(bool increment = true);
  bool IsVisible(SequenceNumber sequence);

@@ -257,6 +255,11 @@ class DBIter final : public Iterator {
    num_internal_keys_skipped_ = 0;
  }

+  bool expect_total_order_inner_iter() {
+    assert(expect_total_order_inner_iter_ || prefix_extractor_ != nullptr);
+    return expect_total_order_inner_iter_;
+  }
+
  const SliceTransform* prefix_extractor_;
  Env* const env_;
  Logger* logger_;
@@ -302,7 +305,9 @@ class DBIter final : public Iterator {
  // Means that we will pin all data blocks we read as long the Iterator
  // is not deleted, will be true if ReadOptions::pin_data is true
  const bool pin_thru_lifetime_;
-  const bool total_order_seek_;
+  // Expect the inner iterator to maintain a total order.
+  // prefix_extractor_ must be non-NULL if the value is false.
+  const bool expect_total_order_inner_iter_;
  bool allow_blob_;
  bool is_blob_;
  bool arena_mode_;
@@ -323,6 +328,7 @@ class DBIter final : public Iterator {
  // if this value > 0 iterator will return internal keys
  SequenceNumber start_seqnum_;
 };
+
 // Return a new iterator that converts internal keys (yielded by
 // "*internal_iter") that were live at the specified `sequence` number
 // into appropriate user keys.
@@ -335,4 +341,4 @@ extern Iterator* NewDBIterator(
    ReadCallback* read_callback, DBImpl* db_impl = nullptr,
    ColumnFamilyData* cfd = nullptr, bool allow_blob = false);

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE
@@ -29,7 +29,7 @@ bool FLAGS_verbose = false;

 #endif

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBIteratorStressTest : public testing::Test {
 public:
@@ -645,7 +645,7 @@ TEST_F(DBIteratorStressTest, StressTest) {
            << "\n  mutated on the fly: " << num_recently_removed << std::endl;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -22,7 +22,7 @@
 #include "util/string_util.h"
 #include "utilities/merge_operators.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 static uint64_t TestGetTickerCount(const Options& options,
                                   Tickers ticker_type) {
@@ -691,7 +691,7 @@ TEST_F(DBIteratorTest, DBIteratorEmpty) {
 TEST_F(DBIteratorTest, DBIteratorUseSkipCountSkips) {
  ReadOptions ro;
  Options options;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.merge_operator = MergeOperators::CreateFromStringId("stringappend");

  TestIterator* internal_iter = new TestIterator(BytewiseComparator());
@@ -746,7 +746,7 @@ TEST_F(DBIteratorTest, DBIteratorUseSkip) {
      }
      internal_iter->Finish();

-      options.statistics = rocksdb::CreateDBStatistics();
+      options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
      std::unique_ptr<Iterator> db_iter(NewDBIterator(
          env_, ro, cf_options, mutable_cf_options, BytewiseComparator(),
          internal_iter, i + 2, options.max_sequential_skip_in_iterations,
@@ -2481,7 +2481,7 @@ TEST_F(DBIteratorTest, DBIteratorTestDifferentialSnapshots) {
    ReadOptions ro;
    ro.iter_start_seqnum=5;
    Options options;
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();

    TestIterator* internal_iter = new TestIterator(BytewiseComparator());
    for (size_t i = 0; i < 10; ++i) {
@@ -2516,7 +2516,7 @@ TEST_F(DBIteratorTest, DBIteratorTestDifferentialSnapshots) {
    ReadOptions ro;
    ro.iter_start_seqnum=5;
    Options options;
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();

    TestIterator* internal_iter = new TestIterator(BytewiseComparator());
    for (size_t i = 0; i < 10; ++i) {
@@ -2661,10 +2661,10 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace1) {
  // Test call back inserts a key in the end of the mem table after
  // MergeIterator::Prev() realized the mem table iterator is at its end
  // and before an SeekToLast() is called.
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev",
      [&](void* /*arg*/) { internal_iter2_->Add("z", kTypeValue, "7", 12u); });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2683,7 +2683,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace1) {
  ASSERT_EQ(db_iter_->key().ToString(), "a");
  ASSERT_EQ(db_iter_->value().ToString(), "4");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace2) {
@@ -2697,12 +2697,12 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace2) {
  // Test call back inserts entries for update a key in the end of the
  // mem table after MergeIterator::Prev() realized the mem tableiterator is at
  // its end and before an SeekToLast() is called.
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev", [&](void* /*arg*/) {
        internal_iter2_->Add("z", kTypeValue, "7", 12u);
        internal_iter2_->Add("z", kTypeValue, "7", 11u);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2721,7 +2721,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace2) {
  ASSERT_EQ(db_iter_->key().ToString(), "a");
  ASSERT_EQ(db_iter_->value().ToString(), "4");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace3) {
@@ -2735,7 +2735,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace3) {
  // Test call back inserts entries for update a key in the end of the
  // mem table after MergeIterator::Prev() realized the mem table iterator is at
  // its end and before an SeekToLast() is called.
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev", [&](void* /*arg*/) {
        internal_iter2_->Add("z", kTypeValue, "7", 16u, true);
        internal_iter2_->Add("z", kTypeValue, "7", 15u, true);
@@ -2744,7 +2744,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace3) {
        internal_iter2_->Add("z", kTypeValue, "7", 12u, true);
        internal_iter2_->Add("z", kTypeValue, "7", 11u, true);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2763,7 +2763,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace3) {
  ASSERT_EQ(db_iter_->key().ToString(), "a");
  ASSERT_EQ(db_iter_->value().ToString(), "4");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace4) {
@@ -2779,7 +2779,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace4) {
  // Test call back inserts entries for update a key before "z" in
  // mem table after MergeIterator::Prev() calls mem table iterator's
  // Seek() and before calling Prev()
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev", [&](void* arg) {
        IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
        if (it->key().starts_with("z")) {
@@ -2791,7 +2791,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace4) {
          internal_iter2_->Add("x", kTypeValue, "7", 11u, true);
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2814,7 +2814,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace4) {
  ASSERT_EQ(db_iter_->key().ToString(), "a");
  ASSERT_EQ(db_iter_->value().ToString(), "4");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace5) {
@@ -2830,7 +2830,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace5) {
  // Test call back inserts entries for update a key before "z" in
  // mem table after MergeIterator::Prev() calls mem table iterator's
  // Seek() and before calling Prev()
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev", [&](void* arg) {
        IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
        if (it->key().starts_with("z")) {
@@ -2838,7 +2838,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace5) {
          internal_iter2_->Add("x", kTypeValue, "7", 15u, true);
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2861,7 +2861,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace5) {
  ASSERT_EQ(db_iter_->key().ToString(), "a");
  ASSERT_EQ(db_iter_->value().ToString(), "4");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace6) {
@@ -2877,14 +2877,14 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace6) {
  // Test call back inserts an entry for update a key before "z" in
  // mem table after MergeIterator::Prev() calls mem table iterator's
  // Seek() and before calling Prev()
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev", [&](void* arg) {
        IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
        if (it->key().starts_with("z")) {
          internal_iter2_->Add("x", kTypeValue, "7", 16u, true);
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2907,7 +2907,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace6) {
  ASSERT_EQ(db_iter_->key().ToString(), "a");
  ASSERT_EQ(db_iter_->value().ToString(), "4");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace7) {
@@ -2926,7 +2926,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace7) {
  // Test call back inserts entries for update a key before "z" in
  // mem table after MergeIterator::Prev() calls mem table iterator's
  // Seek() and before calling Prev()
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev", [&](void* arg) {
        IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
        if (it->key().starts_with("z")) {
@@ -2938,7 +2938,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace7) {
          internal_iter2_->Add("x", kTypeValue, "7", 11u, true);
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2961,7 +2961,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace7) {
  ASSERT_EQ(db_iter_->key().ToString(), "a");
  ASSERT_EQ(db_iter_->value().ToString(), "4");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace8) {
@@ -2979,7 +2979,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace8) {
  // Test call back inserts two keys before "z" in mem table after
  // MergeIterator::Prev() calls mem table iterator's Seek() and
  // before calling Prev()
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "MergeIterator::Prev:BeforePrev", [&](void* arg) {
        IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
        if (it->key().starts_with("z")) {
@@ -2987,7 +2987,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace8) {
          internal_iter2_->Add("y", kTypeValue, "7", 17u, true);
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  db_iter_->Prev();
  ASSERT_TRUE(db_iter_->Valid());
@@ -2998,7 +2998,7 @@ TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace8) {
  ASSERT_EQ(db_iter_->key().ToString(), "d");
  ASSERT_EQ(db_iter_->value().ToString(), "7");

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }


@@ -3167,7 +3167,7 @@ TEST_F(DBIteratorTest, ReverseToForwardWithDisappearingKeys) {
  EXPECT_LT(internal_iter->steps(), 20);
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
@@ -18,7 +18,7 @@
 #include "rocksdb/perf_context.h"
 #include "table/block_based/flush_block_policy.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // A dumb ReadCallback which saying every key is committed.
 class DummyReadCallback : public ReadCallback {
@@ -109,7 +109,7 @@ TEST_P(DBIteratorTest, NonBlockingIteration) {
  do {
    ReadOptions non_blocking_opts, regular_opts;
    Options options = CurrentOptions();
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    non_blocking_opts.read_tier = kBlockCacheTier;
    CreateAndReopenWithCF({"pikachu"}, options);
    // write one kv to the database.
@@ -535,7 +535,7 @@ TEST_P(DBIteratorTest, IterReseek) {
  Options options = CurrentOptions(options_override);
  options.max_sequential_skip_in_iterations = 3;
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  DestroyAndReopen(options);
  CreateAndReopenWithCF({"pikachu"}, options);

@@ -1026,7 +1026,7 @@ TEST_P(DBIteratorTest, DBIteratorBoundMultiSeek) {
  Options options = CurrentOptions();
  options.env = env_;
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.prefix_extractor = nullptr;
  DestroyAndReopen(options);
  ASSERT_OK(Put("a", "0"));
@@ -1081,10 +1081,10 @@ TEST_P(DBIteratorTest, DBIteratorBoundOptimizationTest) {
  for (auto format_version : {2, 3, 4}) {
    int upper_bound_hits = 0;
    Options options = CurrentOptions();
-    rocksdb::SyncPoint::GetInstance()->SetCallBack(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
        "BlockBasedTableIterator:out_of_bound",
        [&upper_bound_hits](void*) { upper_bound_hits++; });
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
    options.env = env_;
    options.create_if_missing = true;
    options.prefix_extractor = nullptr;
@@ -1132,7 +1132,7 @@ TEST_P(DBIteratorTest, IndexWithFirstKey) {
    options.create_if_missing = true;
    options.prefix_extractor = nullptr;
    options.merge_operator = MergeOperators::CreateStringAppendOperator();
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    Statistics* stats = options.statistics.get();
    BlockBasedTableOptions table_options;
    table_options.index_type =
@@ -1223,7 +1223,7 @@ TEST_P(DBIteratorTest, IndexWithFirstKeyGet) {
  options.create_if_missing = true;
  options.prefix_extractor = nullptr;
  options.merge_operator = MergeOperators::CreateStringAppendOperator();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  Statistics* stats = options.statistics.get();
  BlockBasedTableOptions table_options;
  table_options.index_type =
@@ -2012,7 +2012,7 @@ TEST_P(DBIteratorTest, IterPrevKeyCrossingBlocksRandomized) {

 TEST_P(DBIteratorTest, IteratorWithLocalStatistics) {
  Options options = CurrentOptions();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  DestroyAndReopen(options);

  Random rnd(301);
@@ -2110,7 +2110,7 @@ TEST_P(DBIteratorTest, ReadAhead) {
  options.env = env_;
  options.disable_auto_compactions = true;
  options.write_buffer_size = 4 << 20;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  BlockBasedTableOptions table_options;
  table_options.block_size = 1024;
  table_options.no_block_cache = true;
@@ -2188,7 +2188,7 @@ TEST_P(DBIteratorTest, DBIteratorSkipRecentDuplicatesTest) {
  options.max_sequential_skip_in_iterations = 3;
  options.prefix_extractor = nullptr;
  options.write_buffer_size = 1 << 27;  // big enough to avoid flush
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  DestroyAndReopen(options);

  // Insert.
@@ -2480,7 +2480,7 @@ TEST_P(DBIteratorTest, UpperBoundWithPrevReseek) {

 TEST_P(DBIteratorTest, SkipStatistics) {
  Options options = CurrentOptions();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  DestroyAndReopen(options);

  int skip_count = 0;
@@ -2989,10 +2989,10 @@ TEST_F(DBIteratorWithReadCallbackTest, ReadCallback) {
  delete iter;
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -15,7 +15,7 @@
 #include "db/db_test_util.h"
 #include "port/stack_trace.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBTestXactLogIterator : public DBTestBase {
 public:
@@ -98,14 +98,14 @@ TEST_F(DBTestXactLogIterator, TransactionLogIteratorRace) {
  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] },
-      });
+    ROCKSDB_NAMESPACE::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();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearTrace();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
      Options options = OptionsForLogIterTest();
      DestroyAndReopen(options);
      Put("key1", DummyString(1024));
@@ -123,7 +123,7 @@ TEST_F(DBTestXactLogIterator, TransactionLogIteratorRace) {
        ExpectRecords(4, iter);
      }

-      rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
      // trigger async flush, and log move. Well, log move will
      // wait until the GetSortedWalFiles:1 to reproduce the race
      // condition
@@ -185,7 +185,7 @@ TEST_F(DBTestXactLogIterator, TransactionLogIteratorCorruptedLog) {
    dbfull()->Flush(FlushOptions());
    dbfull()->FlushWAL(false);
    // Corrupt this log to create a gap
-    rocksdb::VectorLogPtr wal_files;
+    ROCKSDB_NAMESPACE::VectorLogPtr wal_files;
    ASSERT_OK(dbfull()->GetSortedWalFiles(wal_files));
    const auto logfile_path = dbname_ + "/" + wal_files.front()->PathName();
    if (mem_env_) {
@@ -277,13 +277,13 @@ TEST_F(DBTestXactLogIterator, TransactionLogIteratorBlobs) {
      "Delete(0, key2)",
      handler.seen);
 }
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // !defined(ROCKSDB_LITE)

 int main(int argc, char** argv) {
 #if !defined(ROCKSDB_LITE)
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 #else
@@ -13,7 +13,7 @@
 #include "rocksdb/memtablerep.h"
 #include "rocksdb/slice_transform.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBMemTableTest : public DBTestBase {
 public:
@@ -232,8 +232,8 @@ TEST_F(DBMemTableTest, ConcurrentMergeWrite) {
  value.clear();

  // Write Merge concurrently
-  rocksdb::port::Thread write_thread1([&]() {
-  MemTablePostProcessInfo post_process_info1;
+  ROCKSDB_NAMESPACE::port::Thread write_thread1([&]() {
+    MemTablePostProcessInfo post_process_info1;
    std::string v1;
    for (int seq = 1; seq < num_ops / 2; seq++) {
      PutFixed64(&v1, seq);
@@ -243,8 +243,8 @@ TEST_F(DBMemTableTest, ConcurrentMergeWrite) {
      v1.clear();
    }
  });
-  rocksdb::port::Thread write_thread2([&]() {
-  MemTablePostProcessInfo post_process_info2;
+  ROCKSDB_NAMESPACE::port::Thread write_thread2([&]() {
+    MemTablePostProcessInfo post_process_info2;
    std::string v2;
    for (int seq = num_ops / 2; seq < num_ops; seq++) {
      PutFixed64(&v2, seq);
@@ -331,10 +331,10 @@ TEST_F(DBMemTableTest, ColumnFamilyId) {
  }
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -17,7 +17,7 @@
 #include "utilities/merge_operators/sortlist.h"
 #include "utilities/merge_operators/string_append/stringappend2.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBMergeOperandTest : public DBTestBase {
 public:
@@ -231,10 +231,10 @@ TEST_F(DBMergeOperandTest, GetMergeOperandsBasic) {
  ASSERT_EQ(values[2], "am");
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -12,7 +12,7 @@
 #include "utilities/merge_operators.h"
 #include "utilities/merge_operators/string_append/stringappend2.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class TestReadCallback : public ReadCallback {
 public:
@@ -150,8 +150,6 @@ TEST_F(DBMergeOperatorTest, MergeErrorOnWrite) {
  options.create_if_missing = true;
  options.merge_operator.reset(new TestPutOperator());
  options.max_successive_merges = 3;
-  // allow_concurrent_memtable_write is incompatible with max_successive_merges
-  options.allow_concurrent_memtable_write = false;
  options.env = env_;
  Reopen(options);
  ASSERT_OK(Merge("k1", "v1"));
@@ -420,8 +418,8 @@ TEST_P(MergeOperatorPinningTest, TailingIterator) {
    delete iter;
  };

-  rocksdb::port::Thread writer_thread(writer_func);
-  rocksdb::port::Thread reader_thread(reader_func);
+  ROCKSDB_NAMESPACE::port::Thread writer_thread(writer_func);
+  ROCKSDB_NAMESPACE::port::Thread reader_thread(reader_func);

  writer_thread.join();
  reader_thread.join();
@@ -458,19 +456,19 @@ TEST_F(DBMergeOperatorTest, TailingIteratorMemtableUnrefedBySomeoneElse) {

  bool pushed_first_operand = false;
  bool stepped_to_next_operand = false;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBIter::MergeValuesNewToOld:PushedFirstOperand", [&](void*) {
        EXPECT_FALSE(pushed_first_operand);
        pushed_first_operand = true;
        db_->Flush(FlushOptions()); // Switch to SuperVersion B
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBIter::MergeValuesNewToOld:SteppedToNextOperand", [&](void*) {
        EXPECT_FALSE(stepped_to_next_operand);
        stepped_to_next_operand = true;
        someone_else.reset(); // Unpin SuperVersion A
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  ReadOptions ro;
  ro.tailing = true;
@@ -659,10 +657,10 @@ TEST_P(PerConfigMergeOperatorPinningTest, Randomized) {
  VerifyDBFromMap(true_data);
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -23,7 +23,7 @@
 #include "test_util/testutil.h"
 #include "util/random.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBOptionsTest : public DBTestBase {
 public:
@@ -134,19 +134,17 @@ TEST_F(DBOptionsTest, SetBytesPerSync) {
  int i = 0;
  const std::string kValue(kValueSize, 'v');
  ASSERT_EQ(options.bytes_per_sync, dbfull()->GetDBOptions().bytes_per_sync);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "WritableFileWriter::RangeSync:0", [&](void* /*arg*/) {
-        counter++;
-      });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "WritableFileWriter::RangeSync:0", [&](void* /*arg*/) { counter++; });

  WriteOptions write_opts;
  // should sync approximately 40MB/1MB ~= 40 times.
  for (i = 0; i < 40; i++) {
    Put(Key(i), kValue, write_opts);
  }
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  ASSERT_OK(dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr));
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  low_bytes_per_sync = counter;
  ASSERT_GT(low_bytes_per_sync, 35);
  ASSERT_LT(low_bytes_per_sync, 45);
@@ -160,7 +158,7 @@ TEST_F(DBOptionsTest, SetBytesPerSync) {
  for (i = 0; i < 40; i++) {
    Put(Key(i), kValue, write_opts);
  }
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  ASSERT_OK(dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr));
  ASSERT_GT(counter, 5);
  ASSERT_LT(counter, 15);
@@ -183,11 +181,9 @@ TEST_F(DBOptionsTest, SetWalBytesPerSync) {
  ASSERT_EQ(512, dbfull()->GetDBOptions().wal_bytes_per_sync);
  int counter = 0;
  int low_bytes_per_sync = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "WritableFileWriter::RangeSync:0", [&](void* /*arg*/) {
-        counter++;
-      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "WritableFileWriter::RangeSync:0", [&](void* /*arg*/) { counter++; });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  const std::string kValue(kValueSize, 'v');
  int i = 0;
  for (; i < 10; i++) {
@@ -223,7 +219,7 @@ TEST_F(DBOptionsTest, WritableFileMaxBufferSize) {

  std::atomic<int> match_cnt(0);
  std::atomic<int> unmatch_cnt(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "WritableFileWriter::WritableFileWriter:0", [&](void* arg) {
        int value = static_cast<int>(reinterpret_cast<uintptr_t>(arg));
        if (value == buffer_size) {
@@ -232,7 +228,7 @@ TEST_F(DBOptionsTest, WritableFileMaxBufferSize) {
          unmatch_cnt++;
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  int i = 0;
  for (; i < 3; i++) {
    ASSERT_OK(Put("foo", ToString(i)));
@@ -423,16 +419,22 @@ TEST_F(DBOptionsTest, SetBackgroundJobs) {
            std::to_string(options.max_background_jobs)}}));
    }

-    ASSERT_EQ(options.max_background_jobs / 4,
-              dbfull()->TEST_BGFlushesAllowed());
+    const int expected_max_flushes = options.max_background_jobs / 4;
+
+    ASSERT_EQ(expected_max_flushes, dbfull()->TEST_BGFlushesAllowed());
    ASSERT_EQ(1, dbfull()->TEST_BGCompactionsAllowed());

    auto stop_token = dbfull()->TEST_write_controler().GetStopToken();

-    ASSERT_EQ(options.max_background_jobs / 4,
-              dbfull()->TEST_BGFlushesAllowed());
-    ASSERT_EQ(3 * options.max_background_jobs / 4,
-              dbfull()->TEST_BGCompactionsAllowed());
+    const int expected_max_compactions = 3 * expected_max_flushes;
+
+    ASSERT_EQ(expected_max_flushes, dbfull()->TEST_BGFlushesAllowed());
+    ASSERT_EQ(expected_max_compactions, dbfull()->TEST_BGCompactionsAllowed());
+
+    ASSERT_EQ(expected_max_flushes,
+              env_->GetBackgroundThreads(Env::Priority::HIGH));
+    ASSERT_EQ(expected_max_compactions,
+              env_->GetBackgroundThreads(Env::Priority::LOW));
  }
 }

@@ -859,10 +861,10 @@ TEST_F(DBOptionsTest, FIFOTtlBackwardCompatible) {

 #endif  // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -22,7 +22,7 @@
 #include "util/random.h"
 #include "util/string_util.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBPropertiesTest : public DBTestBase {
 public:
@@ -391,16 +391,16 @@ TEST_F(DBPropertiesTest, ReadLatencyHistogramByLevel) {
  options.max_bytes_for_level_base = 4500 << 10;
  options.target_file_size_base = 98 << 10;
  options.max_write_buffer_number = 2;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.max_open_files = 11;  // Make sure no proloading of table readers

  // RocksDB sanitize max open files to at least 20. Modify it back.
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SanitizeOptions::AfterChangeMaxOpenFiles", [&](void* arg) {
        int* max_open_files = static_cast<int*>(arg);
        *max_open_files = 11;
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  BlockBasedTableOptions table_options;
  table_options.no_block_cache = true;
@@ -448,7 +448,7 @@ TEST_F(DBPropertiesTest, ReadLatencyHistogramByLevel) {

  // Reopen and issue iterating. See thee latency tracked
  ReopenWithColumnFamilies({"default", "pikachu"}, options);
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  ASSERT_TRUE(dbfull()->GetProperty("rocksdb.cf-file-histogram", &prop));
  ASSERT_EQ(std::string::npos, prop.find("** Level 0 read latency histogram"));
  ASSERT_EQ(std::string::npos, prop.find("** Level 1 read latency histogram"));
@@ -1702,10 +1702,10 @@ TEST_F(DBPropertiesTest, BlockCacheProperties) {
 }

 #endif  // ROCKSDB_LITE
-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -5,10 +5,11 @@

 #include "db/db_test_util.h"
 #include "port/stack_trace.h"
+#include "rocksdb/utilities/write_batch_with_index.h"
 #include "test_util/testutil.h"
 #include "utilities/merge_operators.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBRangeDelTest : public DBTestBase {
 public:
@@ -23,8 +24,8 @@ class DBRangeDelTest : public DBTestBase {
  }
 };

-// PlainTableFactory and NumTableFilesAtLevel() are not supported in
-// ROCKSDB_LITE
+// PlainTableFactory, WriteBatchWithIndex, and NumTableFilesAtLevel() are not
+// supported in ROCKSDB_LITE
 #ifndef ROCKSDB_LITE
 TEST_F(DBRangeDelTest, NonBlockBasedTableNotSupported) {
  // TODO: figure out why MmapReads trips the iterator pinning assertion in
@@ -39,6 +40,13 @@ TEST_F(DBRangeDelTest, NonBlockBasedTableNotSupported) {
  }
 }

+TEST_F(DBRangeDelTest, WriteBatchWithIndexNotSupported) {
+  WriteBatchWithIndex indexedBatch{};
+  ASSERT_TRUE(indexedBatch.DeleteRange(db_->DefaultColumnFamily(), "dr1", "dr1")
+                  .IsNotSupported());
+  ASSERT_TRUE(indexedBatch.DeleteRange("dr1", "dr1").IsNotSupported());
+}
+
 TEST_F(DBRangeDelTest, FlushOutputHasOnlyRangeTombstones) {
  do {
    DestroyAndReopen(CurrentOptions());
@@ -917,7 +925,8 @@ TEST_F(DBRangeDelTest, MemtableBloomFilter) {
  Options options = CurrentOptions();
  options.memtable_prefix_bloom_size_ratio =
      static_cast<double>(kMemtablePrefixFilterSize) / kMemtableSize;
-  options.prefix_extractor.reset(rocksdb::NewFixedPrefixTransform(kPrefixLen));
+  options.prefix_extractor.reset(
+      ROCKSDB_NAMESPACE::NewFixedPrefixTransform(kPrefixLen));
  options.write_buffer_size = kMemtableSize;
  Reopen(options);

@@ -1070,7 +1079,7 @@ TEST_F(DBRangeDelTest, RangeTombstoneEndKeyAsSstableUpperBound) {
    // endpoint (key000002#6,1) to disappear.
    ASSERT_EQ(value, Get(Key(2)));
    auto begin_str = Key(3);
-    const rocksdb::Slice begin = begin_str;
+    const ROCKSDB_NAMESPACE::Slice begin = begin_str;
    dbfull()->TEST_CompactRange(1, &begin, nullptr);
    ASSERT_EQ(1, NumTableFilesAtLevel(1));
    ASSERT_EQ(2, NumTableFilesAtLevel(2));
@@ -1089,7 +1098,7 @@ TEST_F(DBRangeDelTest, RangeTombstoneEndKeyAsSstableUpperBound) {
    //     [key000001#5,1, key000002#72057594037927935,15]
    //     [key000002#6,1, key000004#72057594037927935,15]
    auto begin_str = Key(0);
-    const rocksdb::Slice begin = begin_str;
+    const ROCKSDB_NAMESPACE::Slice begin = begin_str;
    dbfull()->TEST_CompactRange(1, &begin, &begin);
    ASSERT_EQ(0, NumTableFilesAtLevel(1));
    ASSERT_EQ(3, NumTableFilesAtLevel(2));
@@ -1642,10 +1651,10 @@ TEST_F(DBRangeDelTest, OverlappedKeys) {

 #endif  // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -13,7 +13,7 @@
 #include "port/stack_trace.h"
 #include "rocksdb/sst_file_manager.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBSSTTest : public DBTestBase {
 public:
@@ -102,6 +102,14 @@ TEST_F(DBSSTTest, SSTsWithLdbSuffixHandling) {
  int const num_files = GetSstFileCount(dbname_);
  ASSERT_GT(num_files, 0);

+  Reopen(options);
+  std::vector<std::string> values;
+  values.reserve(key_id);
+  for (int k = 0; k < key_id; ++k) {
+    values.push_back(Get(Key(k)));
+  }
+  Close();
+
  std::vector<std::string> filenames;
  GetSstFiles(env_, dbname_, &filenames);
  int num_ldb_files = 0;
@@ -119,11 +127,25 @@ TEST_F(DBSSTTest, SSTsWithLdbSuffixHandling) {

  Reopen(options);
  for (int k = 0; k < key_id; ++k) {
-    ASSERT_NE("NOT_FOUND", Get(Key(k)));
+    ASSERT_EQ(values[k], Get(Key(k)));
  }
  Destroy(options);
 }

+// Check that we don't crash when opening DB with
+// DBOptions::skip_checking_sst_file_sizes_on_db_open = true.
+TEST_F(DBSSTTest, SkipCheckingSSTFileSizesOnDBOpen) {
+  ASSERT_OK(Put("pika", "choo"));
+  ASSERT_OK(Flush());
+
+  // Just open the DB with the option set to true and check that we don't crash.
+  Options options;
+  options.skip_checking_sst_file_sizes_on_db_open = true;
+  Reopen(options);
+
+  ASSERT_EQ("choo", Get("pika"));
+}
+
 #ifndef ROCKSDB_LITE
 TEST_F(DBSSTTest, DontDeleteMovedFile) {
  // This test triggers move compaction and verifies that the file is not
@@ -261,13 +283,14 @@ TEST_F(DBSSTTest, DBWithSstFileManager) {
  int files_added = 0;
  int files_deleted = 0;
  int files_moved = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SstFileManagerImpl::OnAddFile", [&](void* /*arg*/) { files_added++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "SstFileManagerImpl::OnDeleteFile", [&](void* /*arg*/) { files_deleted++; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "SstFileManagerImpl::OnDeleteFile",
+      [&](void* /*arg*/) { files_deleted++; });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "SstFileManagerImpl::OnMoveFile", [&](void* /*arg*/) { files_moved++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
  options.sst_file_manager = sst_file_manager;
@@ -315,21 +338,21 @@ TEST_F(DBSSTTest, DBWithSstFileManager) {
  ASSERT_EQ(sfm->GetTrackedFiles(), files_in_db);
  ASSERT_EQ(sfm->GetTotalSize(), total_files_size);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBSSTTest, RateLimitedDelete) {
  Destroy(last_options_);
-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"DBSSTTest::RateLimitedDelete:1",
       "DeleteScheduler::BackgroundEmptyTrash"},
  });

  std::vector<uint64_t> penalties;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DeleteScheduler::BackgroundEmptyTrash:Wait",
      [&](void* arg) { penalties.push_back(*(static_cast<uint64_t*>(arg))); });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "InstrumentedCondVar::TimedWaitInternal", [&](void* arg) {
        // Turn timed wait into a simulated sleep
        uint64_t* abs_time_us = static_cast<uint64_t*>(arg);
@@ -350,7 +373,7 @@ TEST_F(DBSSTTest, RateLimitedDelete) {
        *abs_time_us = static_cast<uint64_t>(real_cur_time);
      });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  env_->no_slowdown_ = true;
  env_->time_elapse_only_sleep_ = true;
@@ -415,14 +438,14 @@ TEST_F(DBSSTTest, RateLimitedDelete) {
  ASSERT_GT(time_spent_deleting, expected_penlty * 0.9);
  ASSERT_LT(time_spent_deleting, expected_penlty * 1.1);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBSSTTest, RateLimitedWALDelete) {
  Destroy(last_options_);

  std::vector<uint64_t> penalties;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DeleteScheduler::BackgroundEmptyTrash:Wait",
      [&](void* arg) { penalties.push_back(*(static_cast<uint64_t*>(arg))); });

@@ -443,7 +466,7 @@ TEST_F(DBSSTTest, RateLimitedWALDelete) {
  sfm->delete_scheduler()->SetMaxTrashDBRatio(3.1);

  ASSERT_OK(TryReopen(options));
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Create 4 files in L0
  for (char v = 'a'; v <= 'd'; v++) {
@@ -467,7 +490,7 @@ TEST_F(DBSSTTest, RateLimitedWALDelete) {
  sfm->WaitForEmptyTrash();
  ASSERT_EQ(penalties.size(), 8);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 class DBWALTestWithParam
@@ -605,14 +628,13 @@ TEST_F(DBSSTTest, OpenDBWithExistingTrash) {
 // files in the second path were not.
 TEST_F(DBSSTTest, DeleteSchedulerMultipleDBPaths) {
  std::atomic<int> bg_delete_file(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DeleteScheduler::DeleteTrashFile:DeleteFile",
      [&](void* /*arg*/) { bg_delete_file++; });
  // The deletion scheduler sometimes skips marking file as trash according to
  // a heuristic. In that case the deletion will go through the below SyncPoint.
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "DeleteScheduler::DeleteFile",
-      [&](void* /*arg*/) { bg_delete_file++; });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "DeleteScheduler::DeleteFile", [&](void* /*arg*/) { bg_delete_file++; });

  Options options = CurrentOptions();
  options.disable_auto_compactions = true;
@@ -630,7 +652,7 @@ TEST_F(DBSSTTest, DeleteSchedulerMultipleDBPaths) {
  auto sfm = static_cast<SstFileManagerImpl*>(options.sst_file_manager.get());

  DestroyAndReopen(options);
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  WriteOptions wo;
  wo.disableWAL = true;
@@ -678,15 +700,15 @@ TEST_F(DBSSTTest, DeleteSchedulerMultipleDBPaths) {
  sfm->WaitForEmptyTrash();
  ASSERT_EQ(bg_delete_file, 10);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBSSTTest, DestroyDBWithRateLimitedDelete) {
  int bg_delete_file = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DeleteScheduler::DeleteTrashFile:DeleteFile",
      [&](void* /*arg*/) { bg_delete_file++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Status s;
  Options options = CurrentOptions();
@@ -771,15 +793,15 @@ TEST_F(DBSSTTest, CancellingCompactionsWorks) {
  DestroyAndReopen(options);

  int completed_compactions = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction():CancelledCompaction", [&](void* /*arg*/) {
        sfm->SetMaxAllowedSpaceUsage(0);
        ASSERT_EQ(sfm->GetCompactionsReservedSize(), 0);
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun",
      [&](void* /*arg*/) { completed_compactions++; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);

@@ -806,7 +828,7 @@ TEST_F(DBSSTTest, CancellingCompactionsWorks) {
  ASSERT_EQ(sfm->GetCompactionsReservedSize(), 0);
  // Make sure the stat is bumped
  ASSERT_GT(dbfull()->immutable_db_options().statistics.get()->getTickerCount(COMPACTION_CANCELLED), 0);
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBSSTTest, CancellingManualCompactionsWorks) {
@@ -854,7 +876,7 @@ TEST_F(DBSSTTest, CancellingManualCompactionsWorks) {

  // Now make sure CompactFiles also gets cancelled
  auto l0_files = collector->GetFlushedFiles();
-  dbfull()->CompactFiles(rocksdb::CompactionOptions(), l0_files, 0);
+  dbfull()->CompactFiles(ROCKSDB_NAMESPACE::CompactionOptions(), l0_files, 0);

  // Wait for manual compaction to get scheduled and finish
  dbfull()->TEST_WaitForCompact(true);
@@ -868,17 +890,17 @@ TEST_F(DBSSTTest, CancellingManualCompactionsWorks) {
  // returns to normal
  sfm->SetMaxAllowedSpaceUsage(0);
  int completed_compactions = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "CompactFilesImpl:End", [&](void* /*arg*/) { completed_compactions++; });

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-  dbfull()->CompactFiles(rocksdb::CompactionOptions(), l0_files, 0);
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
+  dbfull()->CompactFiles(ROCKSDB_NAMESPACE::CompactionOptions(), l0_files, 0);
  dbfull()->TEST_WaitForCompact(true);

  ASSERT_EQ(sfm->GetCompactionsReservedSize(), 0);
  ASSERT_GT(completed_compactions, 0);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_F(DBSSTTest, DBWithMaxSpaceAllowedRandomized) {
@@ -892,7 +914,7 @@ TEST_F(DBSSTTest, DBWithMaxSpaceAllowedRandomized) {

  std::atomic<int> reached_max_space_on_flush(0);
  std::atomic<int> reached_max_space_on_compaction(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::FlushMemTableToOutputFile:MaxAllowedSpaceReached",
      [&](void* arg) {
        Status* bg_error = static_cast<Status*>(arg);
@@ -902,13 +924,13 @@ TEST_F(DBSSTTest, DBWithMaxSpaceAllowedRandomized) {
        *bg_error = Status::OK();
      });

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::BackgroundCompaction():CancelledCompaction", [&](void* arg) {
        bool* enough_room = static_cast<bool*>(arg);
        *enough_room = true;
      });

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "CompactionJob::FinishCompactionOutputFile:MaxAllowedSpaceReached",
      [&](void* /*arg*/) {
        bg_error_set = true;
@@ -917,8 +939,8 @@ TEST_F(DBSSTTest, DBWithMaxSpaceAllowedRandomized) {

  for (auto limit_mb : max_space_limits_mbs) {
    bg_error_set = false;
-    rocksdb::SyncPoint::GetInstance()->ClearTrace();
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearTrace();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
    std::shared_ptr<SstFileManager> sst_file_manager(NewSstFileManager(env_));
    auto sfm = static_cast<SstFileManagerImpl*>(sst_file_manager.get());

@@ -942,7 +964,7 @@ TEST_F(DBSSTTest, DBWithMaxSpaceAllowedRandomized) {
    uint64_t total_sst_files_size = 0;
    GetAllSSTFiles(&total_sst_files_size);
    ASSERT_GE(total_sst_files_size, limit_mb * 1024 * 1024);
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }

  ASSERT_GT(reached_max_space_on_flush, 0);
@@ -1196,10 +1218,10 @@ TEST_F(DBSSTTest, GetTotalSstFilesSizeVersionsFilesShared) {

 #endif  // ROCKSDB_LITE

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -10,7 +10,7 @@
 #include "port/stack_trace.h"
 #include "rocksdb/statistics.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBStatisticsTest : public DBTestBase {
 public:
@@ -45,7 +45,7 @@ TEST_F(DBStatisticsTest, CompressionStatsTest) {

  Options options = CurrentOptions();
  options.compression = type;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.statistics->set_stats_level(StatsLevel::kExceptTimeForMutex);
  DestroyAndReopen(options);

@@ -91,7 +91,7 @@ TEST_F(DBStatisticsTest, CompressionStatsTest) {
 TEST_F(DBStatisticsTest, MutexWaitStatsDisabledByDefault) {
  Options options = CurrentOptions();
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  CreateAndReopenWithCF({"pikachu"}, options);
  const uint64_t kMutexWaitDelay = 100;
  ThreadStatusUtil::TEST_SetStateDelay(ThreadStatus::STATE_MUTEX_WAIT,
@@ -104,7 +104,7 @@ TEST_F(DBStatisticsTest, MutexWaitStatsDisabledByDefault) {
 TEST_F(DBStatisticsTest, MutexWaitStats) {
  Options options = CurrentOptions();
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.statistics->set_stats_level(StatsLevel::kAll);
  CreateAndReopenWithCF({"pikachu"}, options);
  const uint64_t kMutexWaitDelay = 100;
@@ -118,7 +118,7 @@ TEST_F(DBStatisticsTest, MutexWaitStats) {
 TEST_F(DBStatisticsTest, ResetStats) {
  Options options = CurrentOptions();
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  DestroyAndReopen(options);
  for (int i = 0; i < 2; ++i) {
    // pick arbitrary ticker and histogram. On first iteration they're zero
@@ -140,10 +140,10 @@ TEST_F(DBStatisticsTest, ResetStats) {
  }
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -19,7 +19,7 @@

 #ifndef ROCKSDB_LITE

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 // A helper function that ensures the table properties returned in
 // `GetPropertiesOfAllTablesTest` is correct.
@@ -325,12 +325,12 @@ TEST_F(DBTablePropertiesTest, DeletionTriggeredCompactionMarking) {

 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // ROCKSDB_LITE

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -16,7 +16,7 @@
 #include "db/forward_iterator.h"
 #include "port/stack_trace.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBTestTailingIterator : public DBTestBase {
 public:
@@ -98,8 +98,8 @@ TEST_F(DBTestTailingIterator, TailingIteratorSeekToNext) {
    ASSERT_TRUE(itern->Valid());
    ASSERT_EQ(itern->key().compare(key), 0);
  }
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  for (int i = 2 * num_records; i > 0; --i) {
    char buf1[32];
    char buf2[32];
@@ -143,25 +143,25 @@ TEST_F(DBTestTailingIterator, TailingIteratorTrimSeekToNext) {
  bool file_iters_deleted = false;
  bool file_iters_renewed_null = false;
  bool file_iters_renewed_copy = false;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "ForwardIterator::SeekInternal:Return", [&](void* arg) {
        ForwardIterator* fiter = reinterpret_cast<ForwardIterator*>(arg);
        ASSERT_TRUE(!file_iters_deleted ||
                    fiter->TEST_CheckDeletedIters(&deleted_iters, &num_iters));
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "ForwardIterator::Next:Return", [&](void* arg) {
        ForwardIterator* fiter = reinterpret_cast<ForwardIterator*>(arg);
        ASSERT_TRUE(!file_iters_deleted ||
                    fiter->TEST_CheckDeletedIters(&deleted_iters, &num_iters));
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "ForwardIterator::RenewIterators:Null",
      [&](void* /*arg*/) { file_iters_renewed_null = true; });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "ForwardIterator::RenewIterators:Copy",
      [&](void* /*arg*/) { file_iters_renewed_copy = true; });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  const int num_records = 1000;
  for (int i = 1; i < num_records; ++i) {
    char buf1[32];
@@ -413,14 +413,14 @@ TEST_F(DBTestTailingIterator, TailingIteratorUpperBound) {

  // This keeps track of the number of times NeedToSeekImmutable() was true.
  int immutable_seeks = 0;
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "ForwardIterator::SeekInternal:Immutable",
      [&](void* /*arg*/) { ++immutable_seeks; });

  // Seek to 13. This should not require any immutable seeks.
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  it->Seek("13");
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();

  ASSERT_FALSE(it->Valid());
  ASSERT_EQ(0, immutable_seeks);
@@ -530,13 +530,13 @@ TEST_F(DBTestTailingIterator, SeekToFirstWithUpperBoundBug) {
  ASSERT_EQ(iter->key().ToString(), "aa");
 }

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #endif  // !defined(ROCKSDB_LITE)

 int main(int argc, char** argv) {
 #if !defined(ROCKSDB_LITE)
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
 #else
@@ -68,7 +68,7 @@
 #include "util/string_util.h"
 #include "utilities/merge_operators.h"

-namespace rocksdb {
+namespace ROCKSDB_NAMESPACE {

 class DBTest : public DBTestBase {
 public:
@@ -232,14 +232,14 @@ TEST_F(DBTest, SkipDelay) {
      // the test flaky
      auto token = dbfull()->TEST_write_controler().GetDelayToken(1);
      std::atomic<int> sleep_count(0);
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "DBImpl::DelayWrite:Sleep",
          [&](void* /*arg*/) { sleep_count.fetch_add(1); });
      std::atomic<int> wait_count(0);
-      rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
          "DBImpl::DelayWrite:Wait",
          [&](void* /*arg*/) { wait_count.fetch_add(1); });
-      rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

      WriteOptions wo;
      wo.sync = sync;
@@ -290,9 +290,8 @@ TEST_F(DBTest, MixedSlowdownOptions) {
  // the test flaky
  auto token = dbfull()->TEST_write_controler().GetDelayToken(1);
  std::atomic<int> sleep_count(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "DBImpl::DelayWrite:BeginWriteStallDone",
-      [&](void* /*arg*/) {
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::DelayWrite:BeginWriteStallDone", [&](void* /*arg*/) {
        sleep_count.fetch_add(1);
        if (threads.empty()) {
          for (int i = 0; i < 2; ++i) {
@@ -303,7 +302,7 @@ TEST_F(DBTest, MixedSlowdownOptions) {
          }
        }
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  WriteOptions wo;
  wo.sync = false;
@@ -345,9 +344,8 @@ TEST_F(DBTest, MixedSlowdownOptionsInQueue) {
  // the test flaky
  auto token = dbfull()->TEST_write_controler().GetDelayToken(1);
  std::atomic<int> sleep_count(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "DBImpl::DelayWrite:Sleep",
-      [&](void* /*arg*/) {
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::DelayWrite:Sleep", [&](void* /*arg*/) {
        sleep_count.fetch_add(1);
        if (threads.empty()) {
          for (int i = 0; i < 2; ++i) {
@@ -359,10 +357,10 @@ TEST_F(DBTest, MixedSlowdownOptionsInQueue) {
        }
      });
  std::atomic<int> wait_count(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::DelayWrite:Wait",
      [&](void* /*arg*/) { wait_count.fetch_add(1); });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  WriteOptions wo;
  wo.sync = false;
@@ -414,9 +412,8 @@ TEST_F(DBTest, MixedSlowdownOptionsStop) {
  // the test flaky
  auto token = dbfull()->TEST_write_controler().GetStopToken();
  std::atomic<int> wait_count(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
-      "DBImpl::DelayWrite:Wait",
-      [&](void* /*arg*/) {
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::DelayWrite:Wait", [&](void* /*arg*/) {
        wait_count.fetch_add(1);
        if (threads.empty()) {
          for (int i = 0; i < 2; ++i) {
@@ -432,7 +429,7 @@ TEST_F(DBTest, MixedSlowdownOptionsStop) {
        token.reset();
        threads.emplace_back(wakeup_writer);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  WriteOptions wo;
  wo.sync = false;
@@ -2277,6 +2274,41 @@ TEST_F(DBTest, SnapshotFiles) {
    dbfull()->DisableFileDeletions();
  } while (ChangeCompactOptions());
 }
+
+TEST_F(DBTest, ReadonlyDBGetLiveManifestSize) {
+  do {
+    Options options = CurrentOptions();
+    options.level0_file_num_compaction_trigger = 2;
+    DestroyAndReopen(options);
+
+    ASSERT_OK(Put("foo", "bar"));
+    ASSERT_OK(Flush());
+    ASSERT_OK(Put("foo", "bar"));
+    ASSERT_OK(Flush());
+    ASSERT_OK(dbfull()->TEST_WaitForCompact());
+
+    Close();
+    ASSERT_OK(ReadOnlyReopen(options));
+
+    uint64_t manifest_size = 0;
+    std::vector<std::string> files;
+    dbfull()->GetLiveFiles(files, &manifest_size);
+
+    for (const std::string& f : files) {
+      uint64_t number = 0;
+      FileType type;
+      if (ParseFileName(f.substr(1), &number, &type)) {
+        if (type == kDescriptorFile) {
+          uint64_t size_on_disk;
+          env_->GetFileSize(dbname_ + "/" + f, &size_on_disk);
+          ASSERT_EQ(manifest_size, size_on_disk);
+          break;
+        }
+      }
+    }
+    Close();
+  } while (ChangeCompactOptions());
+}
 #endif

 TEST_F(DBTest, PurgeInfoLogs) {
@@ -2557,15 +2589,15 @@ TEST_F(DBTest, GroupCommitTest) {
  do {
    Options options = CurrentOptions();
    options.env = env_;
-    options.statistics = rocksdb::CreateDBStatistics();
+    options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
    Reopen(options);

-    rocksdb::SyncPoint::GetInstance()->LoadDependency(
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
        {{"WriteThread::JoinBatchGroup:BeganWaiting",
          "DBImpl::WriteImpl:BeforeLeaderEnters"},
-          {"WriteThread::AwaitState:BlockingWaiting",
+         {"WriteThread::AwaitState:BlockingWaiting",
          "WriteThread::EnterAsBatchGroupLeader:End"}});
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    // Start threads
    GCThread thread[kGCNumThreads];
@@ -2884,13 +2916,13 @@ class ModelDB : public DB {
  DBOptions GetDBOptions() const override { return options_; }

  using DB::Flush;
-  Status Flush(const rocksdb::FlushOptions& /*options*/,
+  Status Flush(const ROCKSDB_NAMESPACE::FlushOptions& /*options*/,
               ColumnFamilyHandle* /*column_family*/) override {
    Status ret;
    return ret;
  }
  Status Flush(
-      const rocksdb::FlushOptions& /*options*/,
+      const ROCKSDB_NAMESPACE::FlushOptions& /*options*/,
      const std::vector<ColumnFamilyHandle*>& /*column_families*/) override {
    return Status::OK();
  }
@@ -2923,8 +2955,8 @@ class ModelDB : public DB {
  Status DeleteFile(std::string /*name*/) override { return Status::OK(); }

  Status GetUpdatesSince(
-      rocksdb::SequenceNumber,
-      std::unique_ptr<rocksdb::TransactionLogIterator>*,
+      ROCKSDB_NAMESPACE::SequenceNumber,
+      std::unique_ptr<ROCKSDB_NAMESPACE::TransactionLogIterator>*,
      const TransactionLogIterator::ReadOptions& /*read_options*/ =
          TransactionLogIterator::ReadOptions()) override {
    return Status::NotSupported("Not supported in Model DB");
@@ -3174,6 +3206,57 @@ TEST_F(DBTest, BlockBasedTablePrefixIndexTest) {
  ASSERT_EQ("v2", Get("k2"));
 }

+TEST_F(DBTest, BlockBasedTablePrefixIndexTotalOrderSeek) {
+  // create a DB with block prefix index
+  BlockBasedTableOptions table_options;
+  Options options = CurrentOptions();
+  options.max_open_files = 10;
+  table_options.index_type = BlockBasedTableOptions::kHashSearch;
+  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
+  options.prefix_extractor.reset(NewFixedPrefixTransform(1));
+
+  // RocksDB sanitize max open files to at least 20. Modify it back.
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "SanitizeOptions::AfterChangeMaxOpenFiles", [&](void* arg) {
+        int* max_open_files = static_cast<int*>(arg);
+        *max_open_files = 11;
+      });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
+
+  Reopen(options);
+  ASSERT_OK(Put("k1", "v1"));
+  Flush();
+
+  CompactRangeOptions cro;
+  cro.change_level = true;
+  cro.target_level = 1;
+  ASSERT_OK(db_->CompactRange(cro, nullptr, nullptr));
+
+  // Force evict tables
+  dbfull()->TEST_table_cache()->SetCapacity(0);
+  // Make table cache to keep one entry.
+  dbfull()->TEST_table_cache()->SetCapacity(1);
+
+  ReadOptions read_options;
+  read_options.total_order_seek = true;
+  {
+    std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
+    iter->Seek("k1");
+    ASSERT_TRUE(iter->Valid());
+    ASSERT_EQ("k1", iter->key().ToString());
+  }
+
+  // After total order seek, prefix index should still be used.
+  read_options.total_order_seek = false;
+  {
+    std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
+    iter->Seek("k1");
+    ASSERT_TRUE(iter->Valid());
+    ASSERT_EQ("k1", iter->key().ToString());
+  }
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+}
+
 TEST_F(DBTest, ChecksumTest) {
  BlockBasedTableOptions table_options;
  Options options = CurrentOptions();
@@ -3595,7 +3678,7 @@ TEST_F(DBTest, DISABLED_RateLimitingTest) {
  options.compression = kNoCompression;
  options.create_if_missing = true;
  options.env = env_;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.IncreaseParallelism(4);
  DestroyAndReopen(options);

@@ -3921,10 +4004,10 @@ TEST_F(DBTest, DynamicMemtableOptions) {
  int count = 0;
  Random rnd(301);

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::DelayWrite:Wait",
      [&](void* /*arg*/) { sleeping_task_low.WakeUp(); });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  while (!sleeping_task_low.WokenUp() && count < 256) {
    ASSERT_OK(Put(Key(count), RandomString(&rnd, 1024), WriteOptions()));
@@ -3982,7 +4065,7 @@ TEST_F(DBTest, DynamicMemtableOptions) {
 #endif
  sleeping_task_low.WaitUntilDone();

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }
 #endif  // ROCKSDB_LITE

@@ -4091,11 +4174,11 @@ TEST_F(DBTest, ThreadStatusFlush) {
  options.enable_thread_tracking = true;
  options = CurrentOptions(options);

-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"FlushJob::FlushJob()", "DBTest::ThreadStatusFlush:1"},
      {"DBTest::ThreadStatusFlush:2", "FlushJob::WriteLevel0Table"},
  });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  CreateAndReopenWithCF({"pikachu"}, options);
  VerifyOperationCount(env_, ThreadStatus::OP_FLUSH, 0);
@@ -4120,7 +4203,7 @@ TEST_F(DBTest, ThreadStatusFlush) {
  // This second sync point is to ensure the flush job will not
  // be completed until we already perform VerifyOperationCount().
  TEST_SYNC_POINT("DBTest::ThreadStatusFlush:2");
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 TEST_P(DBTestWithParam, ThreadStatusSingleCompaction) {
@@ -4143,15 +4226,15 @@ TEST_P(DBTestWithParam, ThreadStatusSingleCompaction) {
  options.level0_file_num_compaction_trigger = kNumL0Files;
  options.max_subcompactions = max_subcompactions_;

-  rocksdb::SyncPoint::GetInstance()->LoadDependency({
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
      {"DBTest::ThreadStatusSingleCompaction:0", "DBImpl::BGWorkCompaction"},
      {"CompactionJob::Run():Start", "DBTest::ThreadStatusSingleCompaction:1"},
      {"DBTest::ThreadStatusSingleCompaction:2", "CompactionJob::Run():End"},
  });
  for (int tests = 0; tests < 2; ++tests) {
    DestroyAndReopen(options);
-    rocksdb::SyncPoint::GetInstance()->ClearTrace();
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearTrace();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    Random rnd(301);
    // The Put Phase.
@@ -4190,7 +4273,7 @@ TEST_P(DBTestWithParam, ThreadStatusSingleCompaction) {

    // repeat the test with disabling thread tracking.
    options.enable_thread_tracking = false;
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
 }

@@ -4287,7 +4370,7 @@ TEST_P(DBTestWithParam, PreShutdownMultipleCompaction) {

  std::vector<ThreadStatus> thread_list;
  // Delay both flush and compaction
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"FlushJob::FlushJob()", "CompactionJob::Run():Start"},
       {"CompactionJob::Run():Start",
        "DBTest::PreShutdownMultipleCompaction:Preshutdown"},
@@ -4298,7 +4381,7 @@ TEST_P(DBTestWithParam, PreShutdownMultipleCompaction) {
       {"CompactionJob::Run():End",
        "DBTest::PreShutdownMultipleCompaction:VerifyPreshutdown"}});

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Make rocksdb busy
  int key = 0;
@@ -4376,7 +4459,7 @@ TEST_P(DBTestWithParam, PreShutdownCompactionMiddle) {

  std::vector<ThreadStatus> thread_list;
  // Delay both flush and compaction
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBTest::PreShutdownCompactionMiddle:Preshutdown",
        "CompactionJob::Run():Inprogress"},
       {"CompactionJob::Run():Start",
@@ -4385,7 +4468,7 @@ TEST_P(DBTestWithParam, PreShutdownCompactionMiddle) {
       {"CompactionJob::Run():End",
        "DBTest::PreShutdownCompactionMiddle:VerifyPreshutdown"}});

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  // Make rocksdb busy
  int key = 0;
@@ -4562,7 +4645,7 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel2) {
  std::atomic<int> num_zlib(0);
  std::atomic<int> num_lz4(0);
  std::atomic<int> num_no(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        if (compaction->output_level() == 4) {
@@ -4570,13 +4653,13 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel2) {
          num_lz4.fetch_add(1);
        }
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "FlushJob::WriteLevel0Table:output_compression", [&](void* arg) {
        auto* compression = reinterpret_cast<CompressionType*>(arg);
        ASSERT_TRUE(*compression == kNoCompression);
        num_no.fetch_add(1);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  for (int i = 0; i < 100; i++) {
    std::string value = RandomString(&rnd, 200);
@@ -4590,8 +4673,8 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel2) {
  Flush();
  dbfull()->TEST_WaitForFlushMemTable();
  dbfull()->TEST_WaitForCompact();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();

  ASSERT_EQ(NumTableFilesAtLevel(1), 0);
  ASSERT_EQ(NumTableFilesAtLevel(2), 0);
@@ -4604,7 +4687,7 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel2) {
  // After base level turn L4->L3, L3 becomes LZ4 and L4 becomes Zlib
  num_lz4.store(0);
  num_no.store(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "LevelCompactionPicker::PickCompaction:Return", [&](void* arg) {
        Compaction* compaction = reinterpret_cast<Compaction*>(arg);
        if (compaction->output_level() == 4 && compaction->start_level() == 3) {
@@ -4615,13 +4698,13 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel2) {
          num_lz4.fetch_add(1);
        }
      });
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "FlushJob::WriteLevel0Table:output_compression", [&](void* arg) {
        auto* compression = reinterpret_cast<CompressionType*>(arg);
        ASSERT_TRUE(*compression == kNoCompression);
        num_no.fetch_add(1);
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  for (int i = 101; i < 500; i++) {
    std::string value = RandomString(&rnd, 200);
@@ -4632,8 +4715,8 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel2) {
    }
  }

-  rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  ASSERT_EQ(NumTableFilesAtLevel(1), 0);
  ASSERT_EQ(NumTableFilesAtLevel(2), 0);
  ASSERT_GT(NumTableFilesAtLevel(3), 0);
@@ -5049,7 +5132,7 @@ TEST_F(DBTest, DynamicMiscOptions) {
  options.create_if_missing = true;
  options.max_sequential_skip_in_iterations = 16;
  options.compression = kNoCompression;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  DestroyAndReopen(options);

  auto assert_reseek_count = [this, &options](int key_start, int num_reseek) {
@@ -5141,7 +5224,7 @@ TEST_F(DBTest, L0L1L2AndUpHitCounter) {
  options.max_write_buffer_number = 2;
  options.max_background_compactions = 8;
  options.max_background_flushes = 8;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  CreateAndReopenWithCF({"mypikachu"}, options);

  int numkeys = 20000;
@@ -5244,7 +5327,7 @@ TEST_F(DBTest, CloseSpeedup) {
  env_->DeleteDir(dbname_);
  DestroyAndReopen(options);

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
  env_->SetBackgroundThreads(1, Env::LOW);
  env_->SetBackgroundThreads(1, Env::HIGH);
  Random rnd(301);
@@ -5299,7 +5382,7 @@ TEST_F(DBTest, MergeTestTime) {
  this->env_->time_elapse_only_sleep_ = true;
  this->env_->no_slowdown_ = true;
  Options options = CurrentOptions();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.merge_operator.reset(new DelayedMergeOperator(this));
  DestroyAndReopen(options);

@@ -5340,7 +5423,7 @@ TEST_P(DBTestWithParam, MergeCompactionTimeTest) {
  SetPerfLevel(kEnableTime);
  Options options = CurrentOptions();
  options.compaction_filter_factory = std::make_shared<KeepFilterFactory>();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.merge_operator.reset(new DelayedMergeOperator(this));
  options.compaction_style = kCompactionStyleUniversal;
  options.max_subcompactions = max_subcompactions_;
@@ -5362,7 +5445,7 @@ TEST_P(DBTestWithParam, FilterCompactionTimeTest) {
      std::make_shared<DelayFilterFactory>(this);
  options.disable_auto_compactions = true;
  options.create_if_missing = true;
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.statistics->set_stats_level(kExceptTimeForMutex);
  options.max_subcompactions = max_subcompactions_;
  DestroyAndReopen(options);
@@ -5626,16 +5709,16 @@ TEST_F(DBTest, AutomaticConflictsWithManualCompaction) {

  // schedule automatic compactions after the manual one starts, but before it
  // finishes to ensure conflict.
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"DBImpl::BackgroundCompaction:Start",
        "DBTest::AutomaticConflictsWithManualCompaction:PrePuts"},
       {"DBTest::AutomaticConflictsWithManualCompaction:PostPuts",
        "DBImpl::BackgroundCompaction:NonTrivial:AfterRun"}});
  std::atomic<int> callback_count(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "DBImpl::MaybeScheduleFlushOrCompaction:Conflict",
      [&](void* /*arg*/) { callback_count.fetch_add(1); });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);
  for (int i = 0; i < 2; ++i) {
@@ -5665,7 +5748,7 @@ TEST_F(DBTest, AutomaticConflictsWithManualCompaction) {
  for (int i = 0; i < 2; ++i) {
    ASSERT_NE("NOT_FOUND", Get(Key(i)));
  }
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  manual_compaction_thread.join();
  dbfull()->TEST_WaitForCompact();
 }
@@ -5689,7 +5772,7 @@ TEST_F(DBTest, CompactFilesShouldTriggerAutoCompaction) {
    ASSERT_OK(Flush());
  }

-  rocksdb::ColumnFamilyMetaData cf_meta_data;
+  ROCKSDB_NAMESPACE::ColumnFamilyMetaData cf_meta_data;
  db_->GetColumnFamilyMetaData(db_->DefaultColumnFamily(), &cf_meta_data);

  std::vector<std::string> input_files;
@@ -5793,19 +5876,19 @@ TEST_F(DBTest, FlushesInParallelWithCompactRange) {
    }

    if (iter == 1) {
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
          {{"DBImpl::RunManualCompaction()::1",
            "DBTest::FlushesInParallelWithCompactRange:1"},
           {"DBTest::FlushesInParallelWithCompactRange:2",
            "DBImpl::RunManualCompaction()::2"}});
    } else {
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
+      ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
          {{"CompactionJob::Run():Start",
            "DBTest::FlushesInParallelWithCompactRange:1"},
           {"DBTest::FlushesInParallelWithCompactRange:2",
            "CompactionJob::Run():End"}});
    }
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

    std::vector<port::Thread> threads;
    threads.emplace_back([&]() { Compact("a", "z"); });
@@ -5824,7 +5907,7 @@ TEST_F(DBTest, FlushesInParallelWithCompactRange) {
    for (auto& t : threads) {
      t.join();
    }
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  }
 }

@@ -5890,7 +5973,7 @@ TEST_F(DBTest, DelayedWriteRate) {
            static_cast<int64_t>(estimated_sleep_time * 2));

  env_->no_slowdown_ = false;
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  sleeping_task_low.WakeUp();
  sleeping_task_low.WaitUntilDone();
 }
@@ -5919,12 +6002,12 @@ TEST_F(DBTest, HardLimit) {
  CreateAndReopenWithCF({"pikachu"}, options);

  std::atomic<int> callback_count(0);
-  rocksdb::SyncPoint::GetInstance()->SetCallBack("DBImpl::DelayWrite:Wait",
-                                                 [&](void* /*arg*/) {
-                                                   callback_count.fetch_add(1);
-                                                   sleeping_task_low.WakeUp();
-                                                 });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::DelayWrite:Wait", [&](void* /*arg*/) {
+        callback_count.fetch_add(1);
+        sleeping_task_low.WakeUp();
+      });
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);
  int key_idx = 0;
@@ -5941,7 +6024,7 @@ TEST_F(DBTest, HardLimit) {
  }
  ASSERT_GE(callback_count.load(), 1);

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  sleeping_task_low.WaitUntilDone();
 }

@@ -6013,7 +6096,7 @@ TEST_F(DBTest, SoftLimit) {
        "DBImpl::BackgroundCallFlush:ContextCleanedUp");
  };

-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Reopen(options);

@@ -6069,7 +6152,7 @@ TEST_F(DBTest, SoftLimit) {
  ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kNormal));

  // Only allow one compactin going through.
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "BackgroundCallCompaction:0", [&](void* /*arg*/) {
        // Schedule a sleeping task.
        sleeping_task_low.Reset();
@@ -6143,7 +6226,7 @@ TEST_F(DBTest, SoftLimit) {
  ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kDelayed));

  sleeping_task_low.WaitUntilSleeping();
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  sleeping_task_low.WakeUp();
  sleeping_task_low.WaitUntilDone();
 }
@@ -6221,7 +6304,7 @@ TEST_F(DBTest, CreateColumnFamilyShouldFailOnIncompatibleOptions) {
 #ifndef ROCKSDB_LITE
 TEST_F(DBTest, RowCache) {
  Options options = CurrentOptions();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.row_cache = NewLRUCache(8192);
  DestroyAndReopen(options);

@@ -6240,7 +6323,7 @@ TEST_F(DBTest, RowCache) {

 TEST_F(DBTest, PinnableSliceAndRowCache) {
  Options options = CurrentOptions();
-  options.statistics = rocksdb::CreateDBStatistics();
+  options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
  options.row_cache = NewLRUCache(8192);
  DestroyAndReopen(options);

@@ -6270,12 +6353,12 @@ TEST_F(DBTest, PinnableSliceAndRowCache) {
 #endif  // ROCKSDB_LITE

 TEST_F(DBTest, DeletingOldWalAfterDrop) {
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
      {{"Test:AllowFlushes", "DBImpl::BGWorkFlush"},
       {"DBImpl::BGWorkFlush:done", "Test:WaitForFlush"}});
-  rocksdb::SyncPoint::GetInstance()->ClearTrace();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearTrace();

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
  Options options = CurrentOptions();
  options.max_total_wal_size = 8192;
  options.compression = kNoCompression;
@@ -6285,7 +6368,7 @@ TEST_F(DBTest, DeletingOldWalAfterDrop) {
  options.level0_stop_writes_trigger = (1 << 30);
  options.disable_auto_compactions = true;
  DestroyAndReopen(options);
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  CreateColumnFamilies({"cf1", "cf2"}, options);
  ASSERT_OK(Put(0, "key1", DummyString(8192)));
@@ -6423,7 +6506,7 @@ TEST_F(DBTest, CreationTimeOfOldestFile) {
  env_->GetCurrentTime(&time_2);
  const uint64_t uint_time_2 = static_cast<uint64_t>(time_2);

-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "PropertyBlockBuilder::AddTableProperty:Start", [&](void* arg) {
        TableProperties* props = reinterpret_cast<TableProperties*>(arg);
        if (set_file_creation_time_to_zero) {
@@ -6444,12 +6527,12 @@ TEST_F(DBTest, CreationTimeOfOldestFile) {
        }
      });
  // Set file creation time in manifest all to 0.
-  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
      "FileMetaData::FileMetaData", [&](void* arg) {
        FileMetaData* meta = static_cast<FileMetaData*>(arg);
        meta->file_creation_time = 0;
      });
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();

  Random rnd(301);
  for (int i = 0; i < kNumLevelFiles; ++i) {
@@ -6499,12 +6582,12 @@ TEST_F(DBTest, CreationTimeOfOldestFile) {
  Status s3 = dbfull()->GetCreationTimeOfOldestFile(&ctime);
  ASSERT_EQ(s3, Status::NotSupported());

-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
+  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
 }

 #endif

-}  // namespace rocksdb
+}  // namespace ROCKSDB_NAMESPACE

 #ifdef ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS
 extern "C" {
@@ -6515,7 +6598,7 @@ void RegisterCustomObjects(int /*argc*/, char** /*argv*/) {}
 #endif  // !ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS

 int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  RegisterCustomObjects(argc, argv);
  return RUN_ALL_TESTS();