db_bench_tool: fix buffer size

Summary: Found by gcc warning: x86_64-pc-linux-gnu-g++ --version x86_64-pc-linux-gnu-g++ (GCC) 7.1.1 20170710 tools/db_bench_tool.cc: In member function 'void rocksdb::Benchmark::RandomWithVerify(rocksdb::ThreadState*)': tools/db_bench_tool.cc:4430:8: error: '%lu' directive output may be truncated writing between 1 and 19 bytes into a region of size between 0 and 66 [-Werror=format-truncation=] void RandomWithVerify(ThreadState* thread) { ^~~~~~~~~~~~~~~~ tools/db_bench_tool.cc:4430:8: note: directive argument in the range [0, 9223372036854775807] tools/db_bench_tool.cc:4492:13: note: 'snprintf' output between 37 and 128 bytes into a destination of size 100 snprintf(msg, sizeof(msg), ~~~~~~~~^~~~~~~~~~~~~~~~~~ "( get:%" PRIu64 " put:%" PRIu64 " del:%" PRIu64 " total:%" \ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PRIu64 " found:%" PRIu64 ")", ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ gets_done, puts_done, deletes_done, readwrites_, found); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1plus: all warnings being treated as errors Makefile:1707: recipe for target 'tools/db_bench_tool.o' failed Closes https://github.com/facebook/rocksdb/pull/2558 Differential Revision: D5398703 Pulled By: siying fbshipit-source-id: 6ffa552bbd8b59cfc2c36289f86ff9b9acca8ca6
table/block.h: change memset
2026-11-06 11:02:36 -05:00 · 2019-10-30 14:12:09 -07:00 · 2019-10-30 14:06:58 -07:00 · 2019-10-30 14:06:58 -07:00 · 2019-10-30 14:06:58 -07:00 · 2019-10-30 14:06:58 -07:00
740 changed files with 15612 additions and 61122 deletions
@@ -0,0 +1,17 @@
+{
+  "project_id" : "rocksdb",
+  "conduit_uri" : "https://phabricator.fb.com/api/",
+  "copyright_holder" : "Facebook",
+  "load" : [
+    "arcanist_util"
+  ],
+  "lint.engine" : "FacebookFbcodeLintEngine",
+  "lint.engine.single.linter" : "FbcodeCppLinter",
+  "unit.engine" : "FacebookFbcodeUnitTestEngine",
+  "arcanist_configuration" : "FacebookArcanistConfiguration",
+  "base" : "git:HEAD^, hg:.^",
+  "git.default-relative-commit" : "HEAD^",
+  "git:arc.feature.start.default" : "origin/master",
+  "arc.feature.start.default" : "master",
+  "history.immutable" : false
+}
@@ -39,6 +39,7 @@ coverage/COVERAGE_REPORT
 .gdbhistory
 .gdb_history
 package/
+.phutil_module_cache
 unity.a
 tags
 etags
@@ -20,9 +20,7 @@ addons:
 env:
  - TEST_GROUP=platform_dependent # 16-18 minutes
  - TEST_GROUP=1 # 33-35 minutes
-  - TEST_GROUP=2 # 18-20 minutes
-  - TEST_GROUP=3 # 20-22 minutes
-  - TEST_GROUP=4 # 12-14 minutes
+  - TEST_GROUP=2 # 30-32 minutes
  # Run java tests
  - JOB_NAME=java_test # 4-11 minutes
  # Build ROCKSDB_LITE
@@ -38,10 +36,6 @@ matrix:
    env: TEST_GROUP=1
  - os: osx
    env: TEST_GROUP=2
-  - os: osx
-    env: TEST_GROUP=3
-  - os: osx
-    env: TEST_GROUP=4
  - os : osx
    env: JOB_NAME=cmake-mingw
  - os : linux
@@ -55,9 +49,6 @@ install:
      brew install ccache;
      PATH=$PATH:/usr/local/opt/ccache/libexec;
    fi
-  - if [[ "${JOB_NAME}" == cmake* ]] && [ "${TRAVIS_OS_NAME}" == linux ]; then
-      mkdir cmake-dist && curl -sfSL https://cmake.org/files/v3.8/cmake-3.8.1-Linux-x86_64.tar.gz | tar --strip-components=1 -C cmake-dist -xz && export PATH=$PWD/cmake-dist/bin:$PATH;
-    fi

 before_script:
  # Increase the maximum number of open file descriptors, since some tests use
@@ -66,17 +57,14 @@ before_script:

 script:
  - ${CXX} --version
-  - if [ `command -v ccache` ]; then ccache -C; fi
-  - if [ "${TEST_GROUP}" == 'platform_dependent' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_END=db_block_cache_test make -j4 all_but_some_tests check_some; fi
-  - if [ "${TEST_GROUP}" == '1' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=db_block_cache_test ROCKSDBTESTS_END=full_filter_block_test make -j4 check_some; fi
-  - if [ "${TEST_GROUP}" == '2' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=full_filter_block_test ROCKSDBTESTS_END=write_batch_with_index_test make -j4 check_some; fi
-  - if [ "${TEST_GROUP}" == '3' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=write_batch_with_index_test ROCKSDBTESTS_END=write_prepared_transaction_test make -j4 check_some; fi
-  - if [ "${TEST_GROUP}" == '4' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=write_prepared_transaction_test make -j4 check_some; fi
+  - if [ "${TEST_GROUP}" == 'platform_dependent' ]; then OPT=-DTRAVIS V=1 make -j4 all; OPT=-DTRAVIS V=1 ROCKSDBTESTS_END=db_block_cache_test make -j4 check_some; fi
+  - if [ "${TEST_GROUP}" == '1' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=db_block_cache_test ROCKSDBTESTS_END=comparator_db_test make -j4 check_some; fi
+  - if [ "${TEST_GROUP}" == '2' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=comparator_db_test make -j4 check_some; fi
  - if [ "${JOB_NAME}" == 'java_test' ]; then OPT=-DTRAVIS V=1 make clean jclean && make rocksdbjava jtest; fi
-  - if [ "${JOB_NAME}" == 'lite_build' ]; then OPT="-DTRAVIS -DROCKSDB_LITE" V=1 make -j4 static_lib tools; fi
+  - if [ "${JOB_NAME}" == 'lite_build' ]; then OPT="-DTRAVIS -DROCKSDB_LITE" V=1 make -j4 static_lib; fi
  - if [ "${JOB_NAME}" == 'examples' ]; then OPT=-DTRAVIS V=1 make -j4 static_lib; cd examples; make -j4; fi
-  - if [ "${JOB_NAME}" == 'cmake' ]; then mkdir build && cd build && cmake -DJNI=1 .. && make -j4 rocksdb rocksdbjni; fi
-  - if [ "${JOB_NAME}" == 'cmake-mingw' ]; then mkdir build && cd build && cmake -DJNI=1 .. -DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++ -DCMAKE_SYSTEM_NAME=Windows && make -j4 rocksdb rocksdbjni; fi
+  - if [ "${JOB_NAME}" == 'cmake' ]; then mkdir build && cd build && cmake .. && make -j4 rocksdb; fi
+  - if [ "${JOB_NAME}" == 'cmake-mingw' ]; then mkdir build && cd build && cmake .. -DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++ -DCMAKE_SYSTEM_NAME=Windows && make -j4 rocksdb; fi
 notifications:
    email:
      - leveldb@fb.com
@@ -9,4 +9,3 @@ Sanjay Ghemawat <sanjay@google.com>
 # Partial list of contributors:
 Kevin Regan <kevin.d.regan@gmail.com>
 Johan Bilien <jobi@litl.com>
-Matthew Von-Maszewski <https://github.com/matthewvon> (Basho Technologies)
@@ -14,7 +14,7 @@
 #        cd build
 # 3. Run cmake to generate project files for Windows, add more options to enable required third-party libraries.
 #    See thirdparty.inc for more information.
-#        sample command: cmake -G "Visual Studio 15 Win64" -DWITH_GFLAGS=1 -DWITH_SNAPPY=1 -DWITH_JEMALLOC=1 -DWITH_JNI=1 ..
+#        sample command: cmake -G "Visual Studio 14 Win64" -DGFLAGS=1 -DSNAPPY=1 -DJEMALLOC=1 -DJNI=1 ..
 # 4. Then build the project in debug mode (you may want to add /m[:<N>] flag to run msbuild in <N> parallel threads
 #                                          or simply /m ot use all avail cores)
 #        msbuild rocksdb.sln
@@ -32,31 +32,21 @@
 # 3. cmake ..
 # 4. make -j

-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 2.6)
 project(rocksdb)
-enable_language(CXX)
-enable_language(C)
-enable_language(ASM)

 if(POLICY CMP0042)
  cmake_policy(SET CMP0042 NEW)
 endif()

-list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake/modules/")
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules/")

-option(WITH_JEMALLOC "build with JeMalloc" OFF)
-option(WITH_SNAPPY "build with SNAPPY" OFF)
-option(WITH_LZ4 "build with lz4" OFF)
-option(WITH_ZLIB "build with zlib" OFF)
 if(MSVC)
-  # Defaults currently different for GFLAGS.
-  #  We will address find_package work a little later
-  option(WITH_GFLAGS "build with GFlags" OFF)
-  option(WITH_XPRESS "build with windows built in compression" OFF)
  include(${CMAKE_CURRENT_SOURCE_DIR}/thirdparty.inc)
 else()
+  option(WITH_JEMALLOC "build with JeMalloc" OFF)
  if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
-    # FreeBSD has jemalloc as default malloc
+    # FreeBSD has jemaloc as default malloc
    # but it does not have all the jemalloc files in include/...
    set(WITH_JEMALLOC ON)
  else()
@@ -66,57 +56,26 @@ else()
      include_directories(${JEMALLOC_INCLUDE_DIR})
    endif()
  endif()
-  
-  # No config file for this
-  option(WITH_GFLAGS "build with GFlags" ON)
-  if(WITH_GFLAGS)
-    find_package(gflags)
-    if(gflags_FOUND)
-      add_definitions(-DGFLAGS=1)
-      include_directories(${gflags_INCLUDE_DIR})
-      list(APPEND THIRDPARTY_LIBS ${gflags_LIBRARIES})
-    endif()
-  endif()
-
+  option(WITH_SNAPPY "build with SNAPPY" OFF)
  if(WITH_SNAPPY)
    find_package(snappy REQUIRED)
    add_definitions(-DSNAPPY)
    include_directories(${SNAPPY_INCLUDE_DIR})
    list(APPEND THIRDPARTY_LIBS ${SNAPPY_LIBRARIES})
  endif()
-
-  if(WITH_ZLIB)
-    find_package(zlib REQUIRED)
-    add_definitions(-DZLIB)
-    include_directories(${ZLIB_INCLUDE_DIR})
-    list(APPEND THIRDPARTY_LIBS ${ZLIB_LIBRARIES})
-  endif()
-
-  option(WITH_BZ2 "build with bzip2" OFF)
-  if(WITH_BZ2)
-    find_package(bzip2 REQUIRED)
-    add_definitions(-DBZIP2)
-    include_directories(${BZIP2_INCLUDE_DIR})
-    list(APPEND THIRDPARTY_LIBS ${BZIP2_LIBRARIES})
-  endif()
-
-  if(WITH_LZ4)
-    find_package(lz4 REQUIRED)
-    add_definitions(-DLZ4)
-    include_directories(${LZ4_INCLUDE_DIR})
-    list(APPEND THIRDPARTY_LIBS ${LZ4_LIBRARIES})
-  endif()
-
-  option(WITH_ZSTD "build with zstd" OFF)
-  if(WITH_ZSTD)
-    find_package(zstd REQUIRED)
-    add_definitions(-DZSTD)
-    include_directories(${ZSTD_INCLUDE_DIR})
-    list(APPEND THIRDPARTY_LIBS ${ZSTD_LIBRARIES})
-  endif()
 endif()

-string(TIMESTAMP GIT_DATE_TIME "%Y/%m/%d %H:%M:%S" UTC)
+if(WIN32)
+  execute_process(COMMAND powershell -noprofile -Command "Get-Date -format MM_dd_yyyy" OUTPUT_VARIABLE DATE)
+  execute_process(COMMAND powershell -noprofile -Command "Get-Date -format HH:mm:ss" OUTPUT_VARIABLE TIME)
+  string(REGEX REPLACE "(..)_(..)_..(..).*" "\\1/\\2/\\3" DATE "${DATE}")
+  string(REGEX REPLACE "(..):(.....).*" " \\1:\\2" TIME "${TIME}")
+  set(GIT_DATE_TIME "${DATE} ${TIME}")
+else()
+  execute_process(COMMAND date "+%Y/%m/%d %H:%M:%S" OUTPUT_VARIABLE DATETIME)
+  string(REGEX REPLACE "\n" "" DATETIME ${DATETIME})
+  set(GIT_DATE_TIME "${DATETIME}")
+endif()

 find_package(Git)

@@ -132,19 +91,20 @@ endif()

 string(REGEX REPLACE "[^0-9a-f]+" "" GIT_SHA "${GIT_SHA}")

-set(SH_CMD "sh")
-execute_process(COMMAND
-  ${SH_CMD} -c "build_tools/version.sh full"
-  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-  OUTPUT_VARIABLE ROCKSDB_VERSION
-)
-string(STRIP "${ROCKSDB_VERSION}" ROCKSDB_VERSION)
-execute_process(COMMAND
-  ${SH_CMD} -c "build_tools/version.sh major"
-  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-  OUTPUT_VARIABLE ROCKSDB_VERSION_MAJOR
-)
-string(STRIP "${ROCKSDB_VERSION_MAJOR}" ROCKSDB_VERSION_MAJOR)
+if(NOT WIN32)
+  execute_process(COMMAND
+      "./build_tools/version.sh" "full"
+      WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+      OUTPUT_VARIABLE ROCKSDB_VERSION
+  )
+  string(STRIP "${ROCKSDB_VERSION}" ROCKSDB_VERSION)
+  execute_process(COMMAND
+      "./build_tools/version.sh" "major"
+      WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+      OUTPUT_VARIABLE ROCKSDB_VERSION_MAJOR
+  )
+  string(STRIP "${ROCKSDB_VERSION_MAJOR}" ROCKSDB_VERSION_MAJOR)
+endif()

 option(WITH_MD_LIBRARY "build with MD" ON)
 if(WIN32 AND MSVC)
@@ -155,78 +115,31 @@ if(WIN32 AND MSVC)
  endif()
 endif()

-set(BUILD_VERSION_CC ${CMAKE_BINARY_DIR}/build_version.cc)
-configure_file(util/build_version.cc.in ${BUILD_VERSION_CC} @ONLY)
-add_library(build_version OBJECT ${BUILD_VERSION_CC})
-target_include_directories(build_version PRIVATE
-  ${CMAKE_CURRENT_SOURCE_DIR}/util)
-if(MSVC)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi /nologo /EHsc /GS /Gd /GR /GF /fp:precise /Zc:wchar_t /Zc:forScope /errorReport:queue")
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /FC /d2Zi+ /W4 /wd4127 /wd4800 /wd4996 /wd4351 /wd4100 /wd4204 /wd4324")
-else()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -W -Wextra -Wall")
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wsign-compare -Wshadow -Wno-unused-parameter -Wno-unused-variable -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-strict-aliasing")
-  if(MINGW)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-format")
-  endif()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-  if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -fno-omit-frame-pointer")
-    include(CheckCXXCompilerFlag)
-    CHECK_CXX_COMPILER_FLAG("-momit-leaf-frame-pointer" HAVE_OMIT_LEAF_FRAME_POINTER)
-    if(HAVE_OMIT_LEAF_FRAME_POINTER)
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -momit-leaf-frame-pointer")
-    endif()
-  endif()
-endif()
-
-include(CheckCCompilerFlag)
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le")
-  CHECK_C_COMPILER_FLAG("-maltivec" HAS_ALTIVEC)
-  if(HAS_ALTIVEC)
-    message(STATUS " HAS_ALTIVEC yes")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -maltivec")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maltivec")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mcpu=power8")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=power8")
-  endif(HAS_ALTIVEC)
-endif(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le")
-
 option(PORTABLE "build a portable binary" OFF)
 option(FORCE_SSE42 "force building with SSE4.2, even when PORTABLE=ON" OFF)
 if(PORTABLE)
  # MSVC does not need a separate compiler flag to enable SSE4.2; if nmmintrin.h
  # is available, it is available by default.
  if(FORCE_SSE42 AND NOT MSVC)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.2 -mpclmul")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.2")
  endif()
 else()
  if(MSVC)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX2")
  else()
-    if(NOT HAVE_POWER8)
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
-    endif()
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
  endif()
 endif()

+set(CMAKE_REQUIRED_FLAGS ${CMAKE_CXX_FLAGS})
 include(CheckCXXSourceCompiles)
-if(NOT MSVC)
-  set(CMAKE_REQUIRED_FLAGS "-msse4.2 -mpclmul")
-endif()
 CHECK_CXX_SOURCE_COMPILES("
 #include <cstdint>
 #include <nmmintrin.h>
-#include <wmmintrin.h>
 int main() {
  volatile uint32_t x = _mm_crc32_u32(0, 0);
-  const auto a = _mm_set_epi64x(0, 0);
-  const auto b = _mm_set_epi64x(0, 0);
-  const auto c = _mm_clmulepi64_si128(a, b, 0x00);
-  auto d = _mm_cvtsi128_si64(c);
 }
 " HAVE_SSE42)
-unset(CMAKE_REQUIRED_FLAGS)
 if(HAVE_SSE42)
  add_definitions(-DHAVE_SSE42)
 elseif(FORCE_SSE42)
@@ -245,6 +158,32 @@ if(HAVE_THREAD_LOCAL)
  add_definitions(-DROCKSDB_SUPPORT_THREAD_LOCAL)
 endif()

+set(BUILD_VERSION_CC ${CMAKE_BINARY_DIR}/build_version.cc)
+configure_file(util/build_version.cc.in ${BUILD_VERSION_CC} @ONLY)
+add_library(build_version OBJECT ${BUILD_VERSION_CC})
+target_include_directories(build_version PRIVATE
+  ${CMAKE_CURRENT_SOURCE_DIR}/util)
+if(MSVC)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi /nologo /EHsc /GS /Gd /GR /GF /fp:precise /Zc:wchar_t /Zc:forScope /errorReport:queue")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /FC /d2Zi+ /W3 /wd4127 /wd4800 /wd4996 /wd4351")
+else()
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -W -Wextra -Wall")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wsign-compare -Wshadow -Wno-unused-parameter -Wno-unused-variable -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers")
+  if(MINGW)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-format")
+  endif()
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+  if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
+    add_definitions(-DNDEBUG)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -fno-omit-frame-pointer")
+    include(CheckCXXCompilerFlag)
+    CHECK_CXX_COMPILER_FLAG("-momit-leaf-frame-pointer" HAVE_OMIT_LEAF_FRAME_POINTER)
+    if(HAVE_OMIT_LEAF_FRAME_POINTER)
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -momit-leaf-frame-pointer")
+    endif()
+  endif()
+endif()
+
 option(FAIL_ON_WARNINGS "Treat compile warnings as errors" ON)
 if(FAIL_ON_WARNINGS)
  if(MSVC)
@@ -285,20 +224,6 @@ if(WITH_UBSAN)
  endif()
 endif()

-find_package(NUMA)
-if(NUMA_FOUND)
-  add_definitions(-DNUMA)
-  include_directories(${NUMA_INCLUDE_DIR})
-  list(APPEND THIRDPARTY_LIBS ${NUMA_LIBRARIES})
-endif()
-
-find_package(TBB)
-if(TBB_FOUND)
-  add_definitions(-DTBB)
-  include_directories(${TBB_INCLUDE_DIR})
-  list(APPEND THIRDPARTY_LIBS ${TBB_LIBRARIES})
-endif()
-
 # Used to run CI build and tests so we can run faster
 set(OPTIMIZE_DEBUG_DEFAULT 0)        # Debug build is unoptimized by default use -DOPTDBG=1 to optimize

@@ -366,8 +291,10 @@ if(NOT WIN32)
 endif()

 option(WITH_FALLOCATE "build with fallocate" ON)
+
 if(WITH_FALLOCATE)
-  CHECK_CXX_SOURCE_COMPILES("
+  include(CheckCSourceCompiles)
+  CHECK_C_SOURCE_COMPILES("
 #include <fcntl.h>
 #include <linux/falloc.h>
 int main() {
@@ -380,38 +307,12 @@ int main() {
  endif()
 endif()

-CHECK_CXX_SOURCE_COMPILES("
-#include <fcntl.h>
-int main() {
-  int fd = open(\"/dev/null\", 0);
-  sync_file_range(fd, 0, 1024, SYNC_FILE_RANGE_WRITE);
-}
-" HAVE_SYNC_FILE_RANGE_WRITE)
-if(HAVE_SYNC_FILE_RANGE_WRITE)
-  add_definitions(-DROCKSDB_RANGESYNC_PRESENT)
-endif()
-
-CHECK_CXX_SOURCE_COMPILES("
-#include <pthread.h>
-int main() {
-  (void) PTHREAD_MUTEX_ADAPTIVE_NP;
-}
-" HAVE_PTHREAD_MUTEX_ADAPTIVE_NP)
-if(HAVE_PTHREAD_MUTEX_ADAPTIVE_NP)
-  add_definitions(-DROCKSDB_PTHREAD_ADAPTIVE_MUTEX)
-endif()
-
-include(CheckCXXSymbolExists)
-check_cxx_symbol_exists(malloc_usable_size malloc.h HAVE_MALLOC_USABLE_SIZE)
+include(CheckFunctionExists)
+CHECK_FUNCTION_EXISTS(malloc_usable_size HAVE_MALLOC_USABLE_SIZE)
 if(HAVE_MALLOC_USABLE_SIZE)
  add_definitions(-DROCKSDB_MALLOC_USABLE_SIZE)
 endif()

-check_cxx_symbol_exists(sched_getcpu sched.h HAVE_SCHED_GETCPU)
-if(HAVE_SCHED_GETCPU)
-  add_definitions(-DROCKSDB_SCHED_GETCPU_PRESENT)
-endif()
-
 include_directories(${PROJECT_SOURCE_DIR})
 include_directories(${PROJECT_SOURCE_DIR}/include)
 include_directories(SYSTEM ${PROJECT_SOURCE_DIR}/third-party/gtest-1.7.0/fused-src)
@@ -479,7 +380,6 @@ set(SOURCES
        db/write_thread.cc
        env/env.cc
        env/env_chroot.cc
-        env/env_encryption.cc
        env/env_hdfs.cc
        env/mock_env.cc
        memtable/alloc_tracker.cc
@@ -514,7 +414,6 @@ set(SOURCES
        table/block_based_table_factory.cc
        table/block_based_table_reader.cc
        table/block_builder.cc
-        table/block_fetcher.cc
        table/block_prefix_index.cc
        table/bloom_block.cc
        table/cuckoo_table_builder.cc
@@ -569,25 +468,20 @@ set(SOURCES
        util/status_message.cc
        util/string_util.cc
        util/sync_point.cc
-        util/sync_point_impl.cc
        util/testutil.cc
        util/thread_local.cc
        util/threadpool_imp.cc
        util/transaction_test_util.cc
        util/xxhash.cc
        utilities/backupable/backupable_db.cc
-        utilities/blob_db/blob_compaction_filter.cc
        utilities/blob_db/blob_db.cc
        utilities/blob_db/blob_db_impl.cc
+        utilities/blob_db/blob_db_options_impl.cc
        utilities/blob_db/blob_dump_tool.cc
        utilities/blob_db/blob_file.cc
        utilities/blob_db/blob_log_reader.cc
        utilities/blob_db/blob_log_writer.cc
        utilities/blob_db/blob_log_format.cc
-        utilities/blob_db/ttl_extractor.cc
-        utilities/cassandra/cassandra_compaction_filter.cc
-        utilities/cassandra/format.cc
-        utilities/cassandra/merge_operator.cc
        utilities/checkpoint/checkpoint_impl.cc
        utilities/col_buf_decoder.cc
        utilities/col_buf_encoder.cc
@@ -604,9 +498,10 @@ set(SOURCES
        utilities/leveldb_options/leveldb_options.cc
        utilities/lua/rocks_lua_compaction_filter.cc
        utilities/memory/memory_util.cc
-        utilities/merge_operators/bytesxor.cc
        utilities/merge_operators/max.cc
        utilities/merge_operators/put.cc
+        utilities/merge_operators/cassandra/format.cc
+        utilities/merge_operators/cassandra/merge_operator.cc
        utilities/merge_operators/string_append/stringappend.cc
        utilities/merge_operators/string_append/stringappend2.cc
        utilities/merge_operators/uint64add.cc
@@ -622,35 +517,18 @@ set(SOURCES
        utilities/spatialdb/spatial_db.cc
        utilities/table_properties_collectors/compact_on_deletion_collector.cc
        utilities/transactions/optimistic_transaction_db_impl.cc
-        utilities/transactions/optimistic_transaction.cc
-        utilities/transactions/pessimistic_transaction.cc
-        utilities/transactions/pessimistic_transaction_db.cc
-        utilities/transactions/snapshot_checker.cc
+        utilities/transactions/optimistic_transaction_impl.cc
        utilities/transactions/transaction_base.cc
+        utilities/transactions/transaction_db_impl.cc
        utilities/transactions/transaction_db_mutex_impl.cc
+        utilities/transactions/transaction_impl.cc
        utilities/transactions/transaction_lock_mgr.cc
        utilities/transactions/transaction_util.cc
-        utilities/transactions/write_prepared_txn.cc
-        utilities/transactions/write_prepared_txn_db.cc
        utilities/ttl/db_ttl_impl.cc
        utilities/write_batch_with_index/write_batch_with_index.cc
        utilities/write_batch_with_index/write_batch_with_index_internal.cc
        $<TARGET_OBJECTS:build_version>)

-if(HAVE_SSE42 AND NOT FORCE_SSE42)
-  if(NOT MSVC)
-set_source_files_properties(
-  util/crc32c.cc
-      PROPERTIES COMPILE_FLAGS "-msse4.2 -mpclmul")
-  endif()
-endif()
-
-if(HAVE_POWER8)
-  list(APPEND SOURCES
-    util/crc32c_ppc.c
-    util/crc32c_ppc_asm.S)
-endif(HAVE_POWER8)
-
 if(WIN32)
  list(APPEND SOURCES
    port/win/io_win.cc
@@ -660,12 +538,6 @@ if(WIN32)
    port/win/win_logger.cc
    port/win/win_thread.cc
    port/win/xpress_win.cc)
-
-if(WITH_JEMALLOC)
-  list(APPEND SOURCES
-    port/win/win_jemalloc.cc)
-endif()
-
 else()
  list(APPEND SOURCES
    port/port_posix.cc
@@ -727,72 +599,7 @@ else()
  message(STATUS "JNI library is disabled")
 endif()

-# Installation and packaging
-if(WIN32)
-  option(ROCKSDB_INSTALL_ON_WINDOWS "Enable install target on Windows" OFF)
-endif()
-if(NOT WIN32 OR ROCKSDB_INSTALL_ON_WINDOWS)
-  if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
-    if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
-      # Change default installation prefix on Linux to /usr
-      set(CMAKE_INSTALL_PREFIX /usr CACHE PATH "Install path prefix, prepended onto install directories." FORCE)
-    endif()
-  endif()
-
-  include(GNUInstallDirs)
-  include(CMakePackageConfigHelpers)
-
-  set(package_config_destination ${CMAKE_INSTALL_LIBDIR}/cmake/rocksdb)
-
-  configure_package_config_file(
-    ${CMAKE_CURRENT_LIST_DIR}/cmake/RocksDBConfig.cmake.in RocksDBConfig.cmake
-    INSTALL_DESTINATION ${package_config_destination}
-  )
-
-  write_basic_package_version_file(
-    RocksDBConfigVersion.cmake
-    VERSION ${ROCKSDB_VERSION}
-    COMPATIBILITY SameMajorVersion
-  )
-
-  install(DIRECTORY include/rocksdb COMPONENT devel DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
-
-  install(
-    TARGETS ${ROCKSDB_STATIC_LIB}
-    EXPORT RocksDBTargets
-    COMPONENT devel
-    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-    INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
-  )
-
-  install(
-    TARGETS ${ROCKSDB_SHARED_LIB}
-    EXPORT RocksDBTargets
-    COMPONENT runtime
-    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
-    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-    INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
-  )
-
-  install(
-    EXPORT RocksDBTargets
-    COMPONENT devel
-    DESTINATION ${package_config_destination}
-    NAMESPACE RocksDB::
-  )
-
-  install(
-    FILES
-    ${CMAKE_CURRENT_BINARY_DIR}/RocksDBConfig.cmake
-    ${CMAKE_CURRENT_BINARY_DIR}/RocksDBConfigVersion.cmake
-    COMPONENT devel
-    DESTINATION ${package_config_destination}
-  )
-endif()
-
-option(WITH_TESTS "build with tests" ON)
-if(WITH_TESTS)
-  set(TESTS
+set(TESTS
        cache/cache_test.cc
        cache/lru_cache_test.cc
        db/column_family_test.cc
@@ -805,7 +612,6 @@ if(WITH_TESTS)
        db/corruption_test.cc
        db/cuckoo_table_db_test.cc
        db/db_basic_test.cc
-        db/db_blob_index_test.cc
        db/db_block_cache_test.cc
        db/db_bloom_filter_test.cc
        db/db_compaction_filter_test.cc
@@ -871,7 +677,6 @@ if(WITH_TESTS)
        options/options_test.cc
        table/block_based_filter_block_test.cc
        table/block_test.cc
-        table/cleanable_test.cc
        table/cuckoo_table_builder_test.cc
        table/cuckoo_table_reader_test.cc
        table/full_filter_block_test.cc
@@ -900,10 +705,6 @@ if(WITH_TESTS)
        util/thread_local_test.cc
        utilities/backupable/backupable_db_test.cc
        utilities/blob_db/blob_db_test.cc
-        utilities/cassandra/cassandra_functional_test.cc
-        utilities/cassandra/cassandra_format_test.cc
-        utilities/cassandra/cassandra_row_merge_test.cc
-        utilities/cassandra/cassandra_serialize_test.cc
        utilities/checkpoint/checkpoint_test.cc
        utilities/column_aware_encoding_test.cc
        utilities/date_tiered/date_tiered_test.cc
@@ -912,6 +713,10 @@ if(WITH_TESTS)
        utilities/geodb/geodb_test.cc
        utilities/lua/rocks_lua_test.cc
        utilities/memory/memory_test.cc
+        utilities/merge_operators/cassandra/cassandra_merge_test.cc
+        utilities/merge_operators/cassandra/cassandra_format_test.cc
+        utilities/merge_operators/cassandra/cassandra_row_merge_test.cc
+        utilities/merge_operators/cassandra/cassandra_serialize_test.cc
        utilities/merge_operators/string_append/stringappend_test.cc
        utilities/object_registry_test.cc
        utilities/option_change_migration/option_change_migration_test.cc
@@ -920,96 +725,98 @@ if(WITH_TESTS)
        utilities/persistent_cache/persistent_cache_test.cc
        utilities/redis/redis_lists_test.cc
        utilities/spatialdb/spatial_db_test.cc
-        utilities/simulator_cache/sim_cache_test.cc
        utilities/table_properties_collectors/compact_on_deletion_collector_test.cc
        utilities/transactions/optimistic_transaction_test.cc
        utilities/transactions/transaction_test.cc
-        utilities/transactions/write_prepared_transaction_test.cc
        utilities/ttl/ttl_test.cc
        utilities/write_batch_with_index/write_batch_with_index_test.cc
-  )
-  if(WITH_LIBRADOS)
-    list(APPEND TESTS utilities/env_librados_test.cc)
-  endif()
+)
+if(WITH_LIBRADOS)
+  list(APPEND TESTS utilities/env_librados_test.cc)
+endif()

-  set(BENCHMARKS
-    cache/cache_bench.cc
-    memtable/memtablerep_bench.cc
-    tools/db_bench.cc
-    table/table_reader_bench.cc
-    utilities/column_aware_encoding_exp.cc
-    utilities/persistent_cache/hash_table_bench.cc)
-  add_library(testharness OBJECT util/testharness.cc)
-  foreach(sourcefile ${BENCHMARKS})
+set(BENCHMARKS
+  cache/cache_bench.cc
+  memtable/memtablerep_bench.cc
+  tools/db_bench.cc
+  table/table_reader_bench.cc
+  utilities/column_aware_encoding_exp.cc
+  utilities/persistent_cache/hash_table_bench.cc)
+add_library(testharness OBJECT util/testharness.cc)
+foreach(sourcefile ${BENCHMARKS})
+  get_filename_component(exename ${sourcefile} NAME_WE)
+  add_executable(${exename}${ARTIFACT_SUFFIX} ${sourcefile}
+    $<TARGET_OBJECTS:testharness>)
+  target_link_libraries(${exename}${ARTIFACT_SUFFIX} gtest ${LIBS})
+endforeach(sourcefile ${BENCHMARKS})
+
+# For test util library that is build only in DEBUG mode
+# and linked to tests. Add test only code that is not #ifdefed for Release here.
+set(TESTUTIL_SOURCE
+    db/db_test_util.cc
+    monitoring/thread_status_updater_debug.cc
+    table/mock_table.cc
+    util/fault_injection_test_env.cc
+    utilities/merge_operators/cassandra/test_utils.cc
+)
+# test utilities are only build in debug
+enable_testing()
+add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND})
+set(TESTUTILLIB testutillib${ARTIFACT_SUFFIX})
+add_library(${TESTUTILLIB} STATIC ${TESTUTIL_SOURCE})
+if(MSVC)
+  set_target_properties(${TESTUTILLIB} PROPERTIES COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/testutillib${ARTIFACT_SUFFIX}.pdb")
+endif()
+set_target_properties(${TESTUTILLIB}
+      PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD_RELEASE 1
+      EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
+      EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
+      )
+
+# Tests are excluded from Release builds
+set(TEST_EXES ${TESTS})
+
+foreach(sourcefile ${TEST_EXES})
    get_filename_component(exename ${sourcefile} NAME_WE)
    add_executable(${exename}${ARTIFACT_SUFFIX} ${sourcefile}
      $<TARGET_OBJECTS:testharness>)
-    target_link_libraries(${exename}${ARTIFACT_SUFFIX} gtest ${LIBS})
-  endforeach(sourcefile ${BENCHMARKS})
-
-  # For test util library that is build only in DEBUG mode
-  # and linked to tests. Add test only code that is not #ifdefed for Release here.
-  set(TESTUTIL_SOURCE
-      db/db_test_util.cc
-      monitoring/thread_status_updater_debug.cc
-      table/mock_table.cc
-      util/fault_injection_test_env.cc
-      utilities/cassandra/test_utils.cc
-  )
-  # test utilities are only build in debug
-  enable_testing()
-  add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND})
-  set(TESTUTILLIB testutillib${ARTIFACT_SUFFIX})
-  add_library(${TESTUTILLIB} STATIC ${TESTUTIL_SOURCE})
-  if(MSVC)
-    set_target_properties(${TESTUTILLIB} PROPERTIES COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/testutillib${ARTIFACT_SUFFIX}.pdb")
-  endif()
-  set_target_properties(${TESTUTILLIB}
-        PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD_RELEASE 1
-        EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
-        EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
-        )
-
-  # Tests are excluded from Release builds
-  set(TEST_EXES ${TESTS})
-
-  foreach(sourcefile ${TEST_EXES})
-      get_filename_component(exename ${sourcefile} NAME_WE)
-      add_executable(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX} ${sourcefile}
-        $<TARGET_OBJECTS:testharness>)
-      set_target_properties(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX}
-        PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD_RELEASE 1
-        EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
-        EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
-        OUTPUT_NAME ${exename}${ARTIFACT_SUFFIX}
-        )
-      target_link_libraries(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX} testutillib${ARTIFACT_SUFFIX} gtest ${LIBS})
-      if(NOT "${exename}" MATCHES "db_sanity_test")
-        add_test(NAME ${exename} COMMAND ${exename}${ARTIFACT_SUFFIX})
-        add_dependencies(check ${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX})
-      endif()
-  endforeach(sourcefile ${TEST_EXES})
-
-  # C executables must link to a shared object
-  set(C_TESTS db/c_test.c)
-  set(C_TEST_EXES ${C_TESTS})
-
-  foreach(sourcefile ${C_TEST_EXES})
-      string(REPLACE ".c" "" exename ${sourcefile})
-      string(REGEX REPLACE "^((.+)/)+" "" exename ${exename})
-      add_executable(${exename}${ARTIFACT_SUFFIX} ${sourcefile})
-      set_target_properties(${exename}${ARTIFACT_SUFFIX}
-        PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD_RELEASE 1
-        EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
-        EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
-        )
-      target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${ROCKSDB_IMPORT_LIB} testutillib${ARTIFACT_SUFFIX})
+    set_target_properties(${exename}${ARTIFACT_SUFFIX}
+      PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD_RELEASE 1
+      EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
+      EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
+      )
+    target_link_libraries(${exename}${ARTIFACT_SUFFIX} testutillib${ARTIFACT_SUFFIX} gtest ${LIBS})
+    if(NOT "${exename}" MATCHES "db_sanity_test")
      add_test(NAME ${exename} COMMAND ${exename}${ARTIFACT_SUFFIX})
      add_dependencies(check ${exename}${ARTIFACT_SUFFIX})
-  endforeach(sourcefile ${C_TEST_EXES})
-endif()
+    endif()
+endforeach(sourcefile ${TEST_EXES})

-option(WITH_TOOLS "build with tools" ON)
-if(WITH_TOOLS)
-  add_subdirectory(tools)
+# C executables must link to a shared object
+set(C_TESTS db/c_test.c)
+set(C_TEST_EXES ${C_TESTS})
+
+foreach(sourcefile ${C_TEST_EXES})
+    string(REPLACE ".c" "" exename ${sourcefile})
+    string(REGEX REPLACE "^((.+)/)+" "" exename ${exename})
+    add_executable(${exename}${ARTIFACT_SUFFIX} ${sourcefile})
+    set_target_properties(${exename}${ARTIFACT_SUFFIX}
+      PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD_RELEASE 1
+      EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
+      EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
+      )
+    target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${ROCKSDB_IMPORT_LIB} testutillib${ARTIFACT_SUFFIX})
+    add_test(NAME ${exename} COMMAND ${exename}${ARTIFACT_SUFFIX})
+    add_dependencies(check ${exename}${ARTIFACT_SUFFIX})
+endforeach(sourcefile ${C_TEST_EXES})
+add_subdirectory(tools)
+
+# Installation and packaging for Linux
+if(NOT WIN32)
+install(TARGETS ${ROCKSDB_STATIC_LIB} COMPONENT devel ARCHIVE DESTINATION lib64)
+install(TARGETS ${ROCKSDB_SHARED_LIB} COMPONENT runtime DESTINATION lib64)
+install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/rocksdb/"
+        COMPONENT devel
+        DESTINATION include/rocksdb)
+set(CMAKE_INSTALL_PREFIX /usr)
 endif()
@@ -1,3 +0,0 @@
-# Code of Conduct
-
-Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please [read the full text](https://code.facebook.com/codeofconduct) so that you can understand what actions will and will not be tolerated.
@@ -1,8 +1,5 @@
 # Contributing to RocksDB

-## Code of Conduct
-The code of conduct is described in [`CODE_OF_CONDUCT.md`](CODE_OF_CONDUCT.md)
-
 ## Contributor License Agreement ("CLA")

 In order to accept your pull request, we need you to submit a CLA. You
@@ -1,145 +1,11 @@
 # Rocksdb Change Log
-## Unreleased
-### Public API Change
-
-### New Features
-
+## 5.6.2 (08/12/2017)
 ### Bug Fixes
-* Fsync after writing global seq number to the ingestion file in ExternalSstFileIngestionJob.
-
-### Java API Changes
-* Add `BlockBasedTableConfig.setBlockCache` to allow sharing a block cache across DB instances.
-
-## 5.13.0 (3/20/2018)
-### Public API Change
-* RocksDBOptionsParser::Parse()'s `ignore_unknown_options` argument will only be effective if the option file shows it is generated using a higher version of RocksDB than the current version.
-* Remove CompactionEventListener.
-
-### New Features
-* SstFileManager now can cancel compactions if they will result in max space errors. SstFileManager users can also use SetCompactionBufferSize to specify how much space must be leftover during a compaction for auxiliary file functions such as logging and flushing.
-* Avoid unnecessarily flushing in `CompactRange()` when the range specified by the user does not overlap unflushed memtables.
-* If `ColumnFamilyOptions::max_subcompactions` is set greater than one, we now parallelize large manual level-based compactions.
-* Add "rocksdb.live-sst-files-size" DB property to return total bytes of all SST files belong to the latest LSM tree.
-* NewSstFileManager to add an argument bytes_max_delete_chunk with default 64MB. With this argument, a file larger than 64MB will be ftruncated multiple times based on this size.
-
-### Bug Fixes
-* Fix a leak in prepared_section_completed_ where the zeroed entries would not removed from the map.
-* Fix WAL corruption caused by race condition between user write thread and backup/checkpoint thread.
-
-## 5.12.0 (2/14/2018)
-### Public API Change
-* Iterator::SeekForPrev is now a pure virtual method. This is to prevent user who implement the Iterator interface fail to implement SeekForPrev by mistake.
-* Add `include_end` option to make the range end exclusive when `include_end == false` in `DeleteFilesInRange()`.
-* Add `CompactRangeOptions::allow_write_stall`, which makes `CompactRange` start working immediately, even if it causes user writes to stall. The default value is false, meaning we add delay to `CompactRange` calls until stalling can be avoided when possible. Note this delay is not present in previous RocksDB versions.
-* Creating checkpoint with empty directory now returns `Status::InvalidArgument`; previously, it returned `Status::IOError`.
-* Adds a BlockBasedTableOption to turn off index block compression.
-* Close() method now returns a status when closing a db.
-
-### New Features
-* Improve the performance of iterators doing long range scans by using readahead.
-* Add new function `DeleteFilesInRanges()` to delete files in multiple ranges at once for better performance.
-* FreeBSD build support for RocksDB and RocksJava.
-* Improved performance of long range scans with readahead.
-* Updated to and now continuously tested in Visual Studio 2017.
-
-### Bug Fixes
-* Fix `DisableFileDeletions()` followed by `GetSortedWalFiles()` to not return obsolete WAL files that `PurgeObsoleteFiles()` is going to delete.
-* Fix Handle error return from WriteBuffer() during WAL file close and DB close.
-* Fix advance reservation of arena block addresses.
-* Fix handling of empty string as checkpoint directory.
-
-## 5.11.0 (01/08/2018)
-### Public API Change
-* Add `autoTune` and `getBytesPerSecond()` to RocksJava RateLimiter
-
-### New Features
-* Add a new histogram stat called rocksdb.db.flush.micros for memtable flush.
-* Add "--use_txn" option to use transactional API in db_stress.
-* Disable onboard cache for compaction output in Windows platform.
-* Improve the performance of iterators doing long range scans by using readahead.
-
-### Bug Fixes
-* Fix a stack-use-after-scope bug in ForwardIterator.
-* Fix builds on platforms including Linux, Windows, and PowerPC.
-* Fix buffer overrun in backup engine for DBs with huge number of files.
-* Fix a mislabel bug for bottom-pri compaction threads.
-* Fix DB::Flush() keep waiting after flush finish under certain condition.
-
-## 5.10.0 (12/11/2017)
-### Public API Change
-* When running `make` with environment variable `USE_SSE` set and `PORTABLE` unset, will use all machine features available locally. Previously this combination only compiled SSE-related features.
-
-### New Features
-* Provide lifetime hints when writing files on Linux. This reduces hardware write-amp on storage devices supporting multiple streams.
-* Add a DB stat, `NUMBER_ITER_SKIP`, which returns how many internal keys were skipped during iterations (e.g., due to being tombstones or duplicate versions of a key).
-* Add PerfContext counters, `key_lock_wait_count` and `key_lock_wait_time`, which measure the number of times transactions wait on key locks and total amount of time waiting.
-
-### Bug Fixes
-* Fix IOError on WAL write doesn't propagate to write group follower
-* Make iterator invalid on merge error.
-* Fix performance issue in `IngestExternalFile()` affecting databases with large number of SST files.
-* Fix possible corruption to LSM structure when `DeleteFilesInRange()` deletes a subset of files spanned by a `DeleteRange()` marker.
-
-## 5.9.0 (11/1/2017)
-### Public API Change
-* `BackupableDBOptions::max_valid_backups_to_open == 0` now means no backups will be opened during BackupEngine initialization. Previously this condition disabled limiting backups opened.
-* `DBOptions::preserve_deletes` is a new option that allows one to specify that DB should not drop tombstones for regular deletes if they have sequence number larger than what was set by the new API call `DB::SetPreserveDeletesSequenceNumber(SequenceNumber seqnum)`. Disabled by default.
-* API call `DB::SetPreserveDeletesSequenceNumber(SequenceNumber seqnum)` was added, users who wish to preserve deletes are expected to periodically call this function to advance the cutoff seqnum (all deletes made before this seqnum can be dropped by DB). It's user responsibility to figure out how to advance the seqnum in the way so the tombstones are kept for the desired period of time, yet are eventually processed in time and don't eat up too much space.
-* `ReadOptions::iter_start_seqnum` was added; if set to something > 0 user will see 2 changes in iterators behavior 1) only keys written with sequence larger than this parameter would be returned and 2) the `Slice` returned by iter->key() now points to the memory that keep User-oriented representation of the internal key, rather than user key. New struct `FullKey` was added to represent internal keys, along with a new helper function `ParseFullKey(const Slice& internal_key, FullKey* result);`.
-* Deprecate trash_dir param in NewSstFileManager, right now we will rename deleted files to <name>.trash instead of moving them to trash directory
-* Allow setting a custom trash/DB size ratio limit in the SstFileManager, after which files that are to be scheduled for deletion are deleted immediately, regardless of any delete ratelimit.
-* Return an error on write if write_options.sync = true and write_options.disableWAL = true to warn user of inconsistent options. Previously we will not write to WAL and not respecting the sync options in this case.
-
-### New Features
-* CRC32C is now using the 3-way pipelined SSE algorithm `crc32c_3way` on supported platforms to improve performance. The system will choose to use this algorithm on supported platforms automatically whenever possible. If PCLMULQDQ is not supported it will fall back to the old Fast_CRC32 algorithm.
-* `DBOptions::writable_file_max_buffer_size` can now be changed dynamically.
-* `DBOptions::bytes_per_sync`, `DBOptions::compaction_readahead_size`, and `DBOptions::wal_bytes_per_sync` can now be changed dynamically, `DBOptions::wal_bytes_per_sync` will flush all memtables and switch to a new WAL file.
-* Support dynamic adjustment of rate limit according to demand for background I/O. It can be enabled by passing `true` to the `auto_tuned` parameter in `NewGenericRateLimiter()`. The value passed as `rate_bytes_per_sec` will still be respected as an upper-bound.
-* Support dynamically changing `ColumnFamilyOptions::compaction_options_fifo`.
-* Introduce `EventListener::OnStallConditionsChanged()` callback. Users can implement it to be notified when user writes are stalled, stopped, or resumed.
-* Add a new db property "rocksdb.estimate-oldest-key-time" to return oldest data timestamp. The property is available only for FIFO compaction with compaction_options_fifo.allow_compaction = false.
-* Upon snapshot release, recompact bottommost files containing deleted/overwritten keys that previously could not be dropped due to the snapshot. This alleviates space-amp caused by long-held snapshots.
-* Support lower bound on iterators specified via `ReadOptions::iterate_lower_bound`.
-* Support for differential snapshots (via iterator emitting the sequence of key-values representing the difference between DB state at two different sequence numbers). Supports preserving and emitting puts and regular deletes, doesn't support SingleDeletes, MergeOperator, Blobs and Range Deletes.
-
-### Bug Fixes
-* Fix a potential data inconsistency issue during point-in-time recovery. `DB:Open()` will abort if column family inconsistency is found during PIT recovery.
-* Fix possible metadata corruption in databases using `DeleteRange()`.
-
-## 5.8.0 (08/30/2017)
-### Public API Change
-* Users of `Statistics::getHistogramString()` will see fewer histogram buckets and different bucket endpoints.
-* `Slice::compare` and BytewiseComparator `Compare` no longer accept `Slice`s containing nullptr.
-* `Transaction::Get` and `Transaction::GetForUpdate` variants with `PinnableSlice` added.
-
-### New Features
-* Add Iterator::Refresh(), which allows users to update the iterator state so that they can avoid some initialization costs of recreating iterators.
-* Replace dynamic_cast<> (except unit test) so people can choose to build with RTTI off. With make, release mode is by default built with -fno-rtti and debug mode is built without it. Users can override it by setting USE_RTTI=0 or 1.
-* Universal compactions including the bottom level can be executed in a dedicated thread pool. This alleviates head-of-line blocking in the compaction queue, which cause write stalling, particularly in multi-instance use cases. Users can enable this feature via `Env::SetBackgroundThreads(N, Env::Priority::BOTTOM)`, where `N > 0`.
-* Allow merge operator to be called even with a single merge operand during compactions, by appropriately overriding `MergeOperator::AllowSingleOperand`.
-* Add `DB::VerifyChecksum()`, which verifies the checksums in all SST files in a running DB.
-* Block-based table support for disabling checksums by setting `BlockBasedTableOptions::checksum = kNoChecksum`.
-
-### Bug Fixes
-* Fix wrong latencies in `rocksdb.db.get.micros`, `rocksdb.db.write.micros`, and `rocksdb.sst.read.micros`.
 * Fix incorrect dropping of deletions during intra-L0 compaction.
-* Fix transient reappearance of keys covered by range deletions when memtable prefix bloom filter is enabled.
-* Fix potentially wrong file smallest key when range deletions separated by snapshot are written together.
-
-## 5.7.0 (07/13/2017)
-### Public API Change
-* DB property "rocksdb.sstables" now prints keys in hex form.
-
-### New Features
-* Measure estimated number of reads per file. The information can be accessed through DB::GetColumnFamilyMetaData or "rocksdb.sstables" DB property.
-* RateLimiter support for throttling background reads, or throttling the sum of background reads and writes. This can give more predictable I/O usage when compaction reads more data than it writes, e.g., due to lots of deletions.
-* [Experimental] FIFO compaction with TTL support. It can be enabled by setting CompactionOptionsFIFO.ttl > 0.
-* Introduce `EventListener::OnBackgroundError()` callback. Users can implement it to be notified of errors causing the DB to enter read-only mode, and optionally override them.
-* Partitioned Index/Filters exiting the experimental mode. To enable partitioned indexes set index_type to kTwoLevelIndexSearch and to further enable partitioned filters set partition_filters to true. To configure the partition size set metadata_block_size.
-

+## 5.6.1 (07/25/2017)
 ### Bug Fixes
-* Fix discarding empty compaction output files when `DeleteRange()` is used together with subcompactions.
+* Fix lite build.

 ## 5.6.0 (06/06/2017)
 ### Public API Change
@@ -32,7 +32,6 @@ to build a portable binary, add `PORTABLE=1` before your make commands, like thi
 * You can link RocksDB with following compression libraries:
  - [zlib](http://www.zlib.net/) - a library for data compression.
  - [bzip2](http://www.bzip.org/) - a library for data compression.
-  - [lz4](https://github.com/lz4/lz4) - a library for extremely fast data compression.
  - [snappy](http://google.github.io/snappy/) - a library for fast
      data compression.
  - [zstandard](http://www.zstd.net) - Fast real-time compression
@@ -54,7 +53,6 @@ to build a portable binary, add `PORTABLE=1` before your make commands, like thi
      `sudo apt-get install libsnappy-dev`.
    * Install zlib. Try: `sudo apt-get install zlib1g-dev`.
    * Install bzip2: `sudo apt-get install libbz2-dev`.
-    * Install lz4: `sudo apt-get install liblz4-dev`.
    * Install zstandard: `sudo apt-get install libzstd-dev`.

 * **Linux - CentOS / RHEL**
@@ -83,10 +81,6 @@ to build a portable binary, add `PORTABLE=1` before your make commands, like thi

              sudo yum install bzip2 bzip2-devel

-    * Install lz4:
-
-              sudo yum install lz4-devel
-
    * Install ASAN (optional for debugging):

              sudo yum install libasan
@@ -107,70 +101,12 @@ to build a portable binary, add `PORTABLE=1` before your make commands, like thi
            * run `brew tap homebrew/versions; brew install gcc48 --use-llvm` to install gcc 4.8 (or higher).
    * run `brew install rocksdb`

-* **FreeBSD** (11.01):
-
-    * You can either install RocksDB from the Ports system using `cd /usr/ports/databases/rocksdb && make install`, or you can follow the details below to install dependencies and compile from source code:
-
-    * Install the dependencies for RocksDB:
-
-        export BATCH=YES
-        cd /usr/ports/devel/gmake && make install
-        cd /usr/ports/devel/gflags && make install
-
-        cd /usr/ports/archivers/snappy && make install
-        cd /usr/ports/archivers/bzip2 && make install
-        cd /usr/ports/archivers/liblz4 && make install
-        cd /usr/ports/archivesrs/zstd && make install
-
-        cd /usr/ports/devel/git && make install
-
-
-    * Install the dependencies for RocksJava (optional):
-
-        export BATCH=yes
-        cd /usr/ports/java/openjdk7 && make install
-
-    * Build RocksDB from source:
-        cd ~
-        git clone https://github.com/facebook/rocksdb.git
-        cd rocksdb
-        gmake static_lib
-
-    * Build RocksJava from source (optional):
-        cd rocksdb
-        export JAVA_HOME=/usr/local/openjdk7
-        gmake rocksdbjava
-
-* **OpenBSD** (6.3/-current):
-
-    * As RocksDB is not available in the ports yet you have to build it on your own:
-
-    * Install the dependencies for RocksDB:
-
-        pkg_add gmake gflags snappy bzip2 lz4 zstd git jdk bash findutils gnuwatch 
-
-    * Build RocksDB from source:
-
-        cd ~
-        git clone https://github.com/facebook/rocksdb.git
-        cd rocksdb
-        gmake static_lib
-
-    * Build RocksJava from source (optional):
-
-        cd rocksdb
-        export JAVA_HOME=/usr/local/jdk-1.8.0
-        export PATH=$PATH:/usr/local/jdk-1.8.0/bin
-        gmake rocksdbjava
-
 * **iOS**:
  * Run: `TARGET_OS=IOS make static_lib`. When building the project which uses rocksdb iOS library, make sure to define two important pre-processing macros: `ROCKSDB_LITE` and `IOS_CROSS_COMPILE`.

 * **Windows**:
  * For building with MS Visual Studio 13 you will need Update 4 installed.
  * Read and follow the instructions at CMakeLists.txt
-  * Or install via [vcpkg](https://github.com/microsoft/vcpkg) 
-       * run `vcpkg install rocksdb:x64-windows`

 * **AIX 6.1**
    * Install AIX Toolbox rpms with gcc
@@ -9,10 +9,5 @@ This is the list of all known third-party language bindings for RocksDB. If some
 * Haskell - https://hackage.haskell.org/package/rocksdb-haskell
 * PHP - https://github.com/Photonios/rocksdb-php
 * C# - https://github.com/warrenfalk/rocksdb-sharp
-* Rust
-    * https://github.com/spacejam/rust-rocksdb
-    * https://github.com/bh1xuw/rust-rocks
+* Rust - https://github.com/spacejam/rust-rocksdb
 * D programming language - https://github.com/b1naryth1ef/rocksdb
-* Erlang - https://gitlab.com/barrel-db/erlang-rocksdb
-* Elixir - https://github.com/urbint/rox
-* Nim - https://github.com/status-im/nim-rocksdb
@@ -96,34 +96,12 @@ OPT += -momit-leaf-frame-pointer
 endif
 endif

-ifeq (,$(shell $(CXX) -fsyntax-only -maltivec -xc /dev/null 2>&1))
-CXXFLAGS += -DHAS_ALTIVEC
-CFLAGS += -DHAS_ALTIVEC
-HAS_ALTIVEC=1
-endif
-
-ifeq (,$(shell $(CXX) -fsyntax-only -mcpu=power8 -xc /dev/null 2>&1))
-CXXFLAGS += -DHAVE_POWER8
-CFLAGS +=  -DHAVE_POWER8
-HAVE_POWER8=1
-endif
-
-# if we're compiling for release, compile without debug code (-DNDEBUG)
+# if we're compiling for release, compile without debug code (-DNDEBUG) and
+# don't treat warnings as errors
 ifeq ($(DEBUG_LEVEL),0)
 OPT += -DNDEBUG
-
-ifneq ($(USE_RTTI), 1)
-	CXXFLAGS += -fno-rtti
+DISABLE_WARNING_AS_ERROR=1
 else
-	CXXFLAGS += -DROCKSDB_USE_RTTI
-endif
-else
-ifneq ($(USE_RTTI), 0)
-	CXXFLAGS += -DROCKSDB_USE_RTTI
-else
-	CXXFLAGS += -fno-rtti
-endif
-
 $(warning Warning: Compiling in debug mode. Don't use the resulting binary in production)
 endif

@@ -232,18 +210,9 @@ endif
 # USAN doesn't work well with jemalloc. If we're compiling with USAN, we should use regular malloc.
 ifdef COMPILE_WITH_UBSAN
 	DISABLE_JEMALLOC=1
-	# Suppress alignment warning because murmurhash relies on casting unaligned
-	# memory to integer. Fixing it may cause performance regression. 3-way crc32
-	# relies on it too, although it can be rewritten to eliminate with minimal
-	# performance regression.
-	EXEC_LDFLAGS += -fsanitize=undefined -fno-sanitize-recover=all
-	PLATFORM_CCFLAGS += -fsanitize=undefined -fno-sanitize-recover=all -DROCKSDB_UBSAN_RUN
-	PLATFORM_CXXFLAGS += -fsanitize=undefined -fno-sanitize-recover=all -DROCKSDB_UBSAN_RUN
-endif
-
-ifdef ROCKSDB_VALGRIND_RUN
-	PLATFORM_CCFLAGS += -DROCKSDB_VALGRIND_RUN
-	PLATFORM_CXXFLAGS += -DROCKSDB_VALGRIND_RUN
+	EXEC_LDFLAGS += -fsanitize=undefined
+	PLATFORM_CCFLAGS += -fsanitize=undefined -DROCKSDB_UBSAN_RUN
+	PLATFORM_CXXFLAGS += -fsanitize=undefined -DROCKSDB_UBSAN_RUN
 endif

 ifndef DISABLE_JEMALLOC
@@ -251,10 +220,6 @@ ifndef DISABLE_JEMALLOC
 		PLATFORM_CXXFLAGS += -DROCKSDB_JEMALLOC -DJEMALLOC_NO_DEMANGLE
 		PLATFORM_CCFLAGS  += -DROCKSDB_JEMALLOC -DJEMALLOC_NO_DEMANGLE
 	endif
-	ifdef WITH_JEMALLOC_FLAG
-		PLATFORM_LDFLAGS += -ljemalloc
-		JAVA_LDFLAGS += -ljemalloc
-	endif
 	EXEC_LDFLAGS := $(JEMALLOC_LIB) $(EXEC_LDFLAGS)
 	PLATFORM_CXXFLAGS += $(JEMALLOC_INCLUDE)
 	PLATFORM_CCFLAGS += $(JEMALLOC_INCLUDE)
@@ -278,10 +243,6 @@ default: all
 WARNING_FLAGS = -W -Wextra -Wall -Wsign-compare -Wshadow \
  -Wno-unused-parameter

-ifeq ($(PLATFORM), OS_OPENBSD)
-	WARNING_FLAGS += -Wno-unused-lambda-capture
-endif
-
 ifndef DISABLE_WARNING_AS_ERROR
 	WARNING_FLAGS += -Werror
 endif
@@ -313,9 +274,6 @@ LDFLAGS += $(LUA_LIB)

 endif

-ifeq ($(NO_THREEWAY_CRC32C), 1)
-	CXXFLAGS += -DNO_THREEWAY_CRC32C
-endif

 CFLAGS += $(WARNING_FLAGS) -I. -I./include $(PLATFORM_CCFLAGS) $(OPT)
 CXXFLAGS += $(WARNING_FLAGS) -I. -I./include $(PLATFORM_CXXFLAGS) $(OPT) -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers
@@ -348,14 +306,6 @@ util/build_version.cc: FORCE
 endif

 LIBOBJECTS = $(LIB_SOURCES:.cc=.o)
-ifeq ($(HAVE_POWER8),1)
-LIB_CC_OBJECTS = $(LIB_SOURCES:.cc=.o)
-LIBOBJECTS += $(LIB_SOURCES_C:.c=.o)
-LIBOBJECTS += $(LIB_SOURCES_ASM:.S=.o)
-else
-LIB_CC_OBJECTS = $(LIB_SOURCES:.cc=.o)
-endif
-
 LIBOBJECTS += $(TOOL_LIB_SOURCES:.cc=.o)
 MOCKOBJECTS = $(MOCK_LIB_SOURCES:.cc=.o)

@@ -373,7 +323,6 @@ EXPOBJECTS = $(EXP_LIB_SOURCES:.cc=.o) $(LIBOBJECTS) $(TESTUTIL)

 TESTS = \
 	db_basic_test \
-	db_encryption_test \
 	db_test2 \
 	external_sst_file_basic_test \
 	auto_roll_logger_test \
@@ -394,7 +343,6 @@ TESTS = \
 	db_wal_test \
 	db_block_cache_test \
 	db_test \
-	db_blob_index_test \
 	db_bloom_filter_test \
 	db_iter_test \
 	db_log_iter_test \
@@ -410,6 +358,7 @@ TESTS = \
 	db_range_del_test \
 	db_sst_test \
 	db_tailing_iter_test \
+	db_universal_compaction_test \
 	db_io_failure_test \
 	db_properties_test \
 	db_table_properties_test \
@@ -455,7 +404,7 @@ TESTS = \
 	write_buffer_manager_test \
 	stringappend_test \
 	cassandra_format_test \
-	cassandra_functional_test \
+	cassandra_merge_test \
 	cassandra_row_merge_test \
 	cassandra_serialize_test \
 	ttl_test \
@@ -510,14 +459,11 @@ TESTS = \
 	object_registry_test \
 	repair_test \
 	env_timed_test \
-	write_prepared_transaction_test \
-	db_universal_compaction_test \

 PARALLEL_TEST = \
 	backupable_db_test \
 	db_compaction_filter_test \
 	db_compaction_test \
-	db_merge_operator_test \
 	db_sst_test \
 	db_test \
 	db_universal_compaction_test \
@@ -528,13 +474,8 @@ PARALLEL_TEST = \
 	manual_compaction_test \
 	persistent_cache_test \
 	table_test \
-	transaction_test \
-	write_prepared_transaction_test \
+	transaction_test

-# options_settable_test doesn't pass with UBSAN as we use hack in the test
-ifdef COMPILE_WITH_UBSAN
-        TESTS := $(shell echo $(TESTS) | sed 's/\boptions_settable_test\b//g')
-endif
 SUBSET := $(TESTS)
 ifdef ROCKSDBTESTS_START
        SUBSET := $(shell echo $(SUBSET) | sed 's/^.*$(ROCKSDBTESTS_START)/$(ROCKSDBTESTS_START)/')
@@ -613,35 +554,14 @@ $(SHARED2): $(SHARED4)
 $(SHARED3): $(SHARED4)
 	ln -fs $(SHARED4) $(SHARED3)
 endif
-ifeq ($(HAVE_POWER8),1)
-SHARED_C_OBJECTS = $(LIB_SOURCES_C:.c=.o)
-SHARED_ASM_OBJECTS = $(LIB_SOURCES_ASM:.S=.o)
-SHARED_C_LIBOBJECTS = $(patsubst %.o,shared-objects/%.o,$(SHARED_C_OBJECTS))
-SHARED_ASM_LIBOBJECTS = $(patsubst %.o,shared-objects/%.o,$(SHARED_ASM_OBJECTS))
-shared_libobjects = $(patsubst %,shared-objects/%,$(LIB_CC_OBJECTS))
-else
+
 shared_libobjects = $(patsubst %,shared-objects/%,$(LIBOBJECTS))
-endif
-
 CLEAN_FILES += shared-objects
-shared_all_libobjects = $(shared_libobjects)

-ifeq ($(HAVE_POWER8),1)
-shared-ppc-objects = $(SHARED_C_LIBOBJECTS) $(SHARED_ASM_LIBOBJECTS)
-
-shared-objects/util/crc32c_ppc.o: util/crc32c_ppc.c
-	$(AM_V_CC)$(CC) $(CFLAGS) -c $< -o $@
-
-shared-objects/util/crc32c_ppc_asm.o: util/crc32c_ppc_asm.S
-	$(AM_V_CC)$(CC) $(CFLAGS) -c $< -o $@
-endif
 $(shared_libobjects): shared-objects/%.o: %.cc
 	$(AM_V_CC)mkdir -p $(@D) && $(CXX) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) -c $< -o $@

-ifeq ($(HAVE_POWER8),1)
-shared_all_libobjects = $(shared_libobjects) $(shared-ppc-objects)
-endif
-$(SHARED4): $(shared_all_libobjects)
+$(SHARED4): $(shared_libobjects)
 	$(CXX) $(PLATFORM_SHARED_LDFLAGS)$(SHARED3) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(shared_libobjects) $(LDFLAGS) -o $@

 endif  # PLATFORM_SHARED_EXT
@@ -654,8 +574,6 @@ endif  # PLATFORM_SHARED_EXT

 all: $(LIBRARY) $(BENCHMARKS) tools tools_lib test_libs $(TESTS)

-all_but_some_tests: $(LIBRARY) $(BENCHMARKS) tools tools_lib test_libs $(SUBSET)
-
 static_lib: $(LIBRARY)

 shared_lib: $(SHARED)
@@ -678,7 +596,7 @@ coverage:
 	COVERAGEFLAGS="-fprofile-arcs -ftest-coverage" LDFLAGS+="-lgcov" $(MAKE) J=1 all check
 	cd coverage && ./coverage_test.sh
        # Delete intermediate files
-	$(FIND) . -type f -regex ".*\.\(\(gcda\)\|\(gcno\)\)" -exec rm {} \;
+	find . -type f -regex ".*\.\(\(gcda\)\|\(gcno\)\)" -exec rm {} \;

 ifneq (,$(filter check parallel_check,$(MAKECMDGOALS)),)
 # Use /dev/shm if it has the sticky bit set (otherwise, /tmp),
@@ -763,7 +681,7 @@ gen_parallel_tests:
 # 107.816 PASS t/DBTest.EncodeDecompressedBlockSizeTest
 #
 slow_test_regexp = \
-	^.*SnapshotConcurrentAccessTest.*$$|^t/run-table_test-HarnessTest.Randomized$$|^t/run-db_test-.*(?:FileCreationRandomFailure|EncodeDecompressedBlockSizeTest)$$|^.*RecoverFromCorruptedWALWithoutFlush$$
+	^t/run-table_test-HarnessTest.Randomized$$|^t/run-db_test-.*(?:FileCreationRandomFailure|EncodeDecompressedBlockSizeTest)$$|^.*RecoverFromCorruptedWALWithoutFlush$$
 prioritize_long_running_tests =						\
  perl -pe 's,($(slow_test_regexp)),100 $$1,'				\
    | sort -k1,1gr							\
@@ -825,7 +743,7 @@ CLEAN_FILES += t LOG $(TMPD)
 # regardless of their duration. As with any use of "watch", hit ^C to
 # interrupt.
 watch-log:
-	$(WATCH) --interval=0 'sort -k7,7nr -k4,4gr LOG|$(quoted_perl_command)'
+	watch --interval=0 'sort -k7,7nr -k4,4gr LOG|$(quoted_perl_command)'

 # If J != 1 and GNU parallel is installed, run the tests in parallel,
 # via the check_0 rule above.  Otherwise, run them sequentially.
@@ -859,8 +777,8 @@ ldb_tests: ldb
 crash_test: whitebox_crash_test blackbox_crash_test

 blackbox_crash_test: db_stress
-	python -u tools/db_crashtest.py --simple blackbox $(CRASH_TEST_EXT_ARGS)
-	python -u tools/db_crashtest.py blackbox $(CRASH_TEST_EXT_ARGS)
+	python -u tools/db_crashtest.py --simple blackbox
+	python -u tools/db_crashtest.py blackbox

 ifeq ($(CRASH_TEST_KILL_ODD),)
  CRASH_TEST_KILL_ODD=888887
@@ -868,9 +786,9 @@ endif

 whitebox_crash_test: db_stress
 	python -u tools/db_crashtest.py --simple whitebox --random_kill_odd \
-      $(CRASH_TEST_KILL_ODD) $(CRASH_TEST_EXT_ARGS)
+      $(CRASH_TEST_KILL_ODD)
 	python -u tools/db_crashtest.py whitebox  --random_kill_odd \
-      $(CRASH_TEST_KILL_ODD) $(CRASH_TEST_EXT_ARGS)
+      $(CRASH_TEST_KILL_ODD)

 asan_check:
 	$(MAKE) clean
@@ -893,7 +811,7 @@ ubsan_crash_test:
 	$(MAKE) clean

 valgrind_test:
-	ROCKSDB_VALGRIND_RUN=1 DISABLE_JEMALLOC=1 $(MAKE) valgrind_check
+	DISABLE_JEMALLOC=1 $(MAKE) valgrind_check

 valgrind_check: $(TESTS)
 	$(MAKE) DRIVER="$(VALGRIND_VER) $(VALGRIND_OPTS)" gen_parallel_tests
@@ -990,14 +908,14 @@ rocksdb.h rocksdb.cc: build_tools/amalgamate.py Makefile $(LIB_SOURCES) unity.cc
 clean:
 	rm -f $(BENCHMARKS) $(TOOLS) $(TESTS) $(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 {} \;
+	find . -name "*.[oda]" -exec rm -f {} \;
+	find . -type f -regex ".*\.\(\(gcda\)\|\(gcno\)\)" -exec rm {} \;
 	rm -rf bzip2* snappy* zlib* lz4* zstd*
 	cd java; $(MAKE) clean

 tags:
-	ctags -R .
-	cscope -b `$(FIND) . -name '*.cc'` `$(FIND) . -name '*.h'` `$(FIND) . -name '*.c'`
+	ctags * -R
+	cscope -b `find . -name '*.cc'` `find . -name '*.h'` `find . -name '*.c'`
 	ctags -e -R -o etags *

 format:
@@ -1081,16 +999,16 @@ option_change_migration_test: utilities/option_change_migration/option_change_mi
 stringappend_test: utilities/merge_operators/string_append/stringappend_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-cassandra_format_test: utilities/cassandra/cassandra_format_test.o utilities/cassandra/test_utils.o $(LIBOBJECTS) $(TESTHARNESS)
+cassandra_format_test: utilities/merge_operators/cassandra/cassandra_format_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-cassandra_functional_test: utilities/cassandra/cassandra_functional_test.o utilities/cassandra/test_utils.o $(LIBOBJECTS) $(TESTHARNESS)
+cassandra_merge_test: utilities/merge_operators/cassandra/cassandra_merge_test.o utilities/merge_operators/cassandra/test_utils.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-cassandra_row_merge_test: utilities/cassandra/cassandra_row_merge_test.o utilities/cassandra/test_utils.o $(LIBOBJECTS) $(TESTHARNESS)
+cassandra_row_merge_test: utilities/merge_operators/cassandra/cassandra_row_merge_test.o utilities/merge_operators/cassandra/test_utils.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-cassandra_serialize_test: utilities/cassandra/cassandra_serialize_test.o $(LIBOBJECTS) $(TESTHARNESS)
+cassandra_serialize_test: utilities/merge_operators/cassandra/cassandra_serialize_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

 redis_test: utilities/redis/redis_lists_test.o $(LIBOBJECTS) $(TESTHARNESS)
@@ -1117,18 +1035,12 @@ slice_transform_test: util/slice_transform_test.o $(LIBOBJECTS) $(TESTHARNESS)
 db_basic_test: db/db_basic_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-db_encryption_test: db/db_encryption_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(AM_LINK)
-
 db_test: db/db_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

 db_test2: db/db_test2.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-db_blob_index_test: db/db_blob_index_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(AM_LINK)
-
 db_block_cache_test: db/db_block_cache_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

@@ -1293,7 +1205,7 @@ env_test: env/env_test.o $(LIBOBJECTS) $(TESTHARNESS)
 fault_injection_test: db/fault_injection_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-rate_limiter_test: util/rate_limiter_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
+rate_limiter_test: util/rate_limiter_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

 delete_scheduler_test: util/delete_scheduler_test.o $(LIBOBJECTS) $(TESTHARNESS)
@@ -1458,9 +1370,6 @@ heap_test: util/heap_test.o $(GTEST)
 transaction_test: utilities/transactions/transaction_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)

-write_prepared_transaction_test: utilities/transactions/write_prepared_transaction_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(AM_LINK)
-
 sst_dump: tools/sst_dump.o $(LIBOBJECTS)
 	$(AM_LINK)

@@ -1514,10 +1423,10 @@ uninstall:

 install-headers:
 	install -d $(INSTALL_PATH)/lib
-	for header_dir in `$(FIND) "include/rocksdb" -type d`; do \
+	for header_dir in `find "include/rocksdb" -type d`; do \
 		install -d $(INSTALL_PATH)/$$header_dir; \
 	done
-	for header in `$(FIND) "include/rocksdb" -type f -name *.h`; do \
+	for header in `find "include/rocksdb" -type f -name *.h`; do \
 		install -C -m 644 $$header $(INSTALL_PATH)/$$header; \
 	done

@@ -1544,12 +1453,6 @@ install: install-static
 JAVA_INCLUDE = -I$(JAVA_HOME)/include/ -I$(JAVA_HOME)/include/linux
 ifeq ($(PLATFORM), OS_SOLARIS)
 	ARCH := $(shell isainfo -b)
-else ifeq ($(PLATFORM), OS_OPENBSD)
-	ifneq (,$(filter $(MACHINE), amd64 arm64 sparc64))
-		ARCH := 64
-	else
-		ARCH := 32
-	endif
 else
 	ARCH := $(shell getconf LONG_BIT)
 endif
@@ -1574,13 +1477,12 @@ BZIP2_DOWNLOAD_BASE ?= http://www.bzip.org
 SNAPPY_VER ?= 1.1.4
 SNAPPY_SHA256 ?= 134bfe122fd25599bb807bb8130e7ba6d9bdb851e0b16efcb83ac4f5d0b70057
 SNAPPY_DOWNLOAD_BASE ?= https://github.com/google/snappy/releases/download
-LZ4_VER ?= 1.8.0
-LZ4_SHA256 ?= 2ca482ea7a9bb103603108b5a7510b7592b90158c151ff50a28f1ca8389fccf6
+LZ4_VER ?= 1.7.5
+LZ4_SHA256 ?= 0190cacd63022ccb86f44fa5041dc6c3804407ad61550ca21c382827319e7e7e
 LZ4_DOWNLOAD_BASE ?= https://github.com/lz4/lz4/archive
-ZSTD_VER ?= 1.3.3
-ZSTD_SHA256 ?= a77c47153ee7de02626c5b2a097005786b71688be61e9fb81806a011f90b297b
+ZSTD_VER ?= 1.2.0
+ZSTD_SHA256 ?= 4a7e4593a3638276ca7f2a09dc4f38e674d8317bbea51626393ca73fc047cbfb
 ZSTD_DOWNLOAD_BASE ?= https://github.com/facebook/zstd/archive
-CURL_SSL_OPTS ?= --tlsv1

 ifeq ($(PLATFORM), OS_MACOSX)
 	ROCKSDBJNILIB = librocksdbjni-osx.jnilib
@@ -1593,7 +1495,7 @@ else
 endif
 endif
 ifeq ($(PLATFORM), OS_FREEBSD)
-	JAVA_INCLUDE = -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/freebsd
+	JAVA_INCLUDE += -I$(JAVA_HOME)/include/freebsd
 	ROCKSDBJNILIB = librocksdbjni-freebsd$(ARCH).so
 	ROCKSDB_JAR = rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-freebsd$(ARCH).jar
 endif
@@ -1609,11 +1511,6 @@ ifeq ($(PLATFORM), OS_AIX)
 	EXTRACT_SOURCES = gunzip < TAR_GZ | tar xvf -
 	SNAPPY_MAKE_TARGET = libsnappy.la
 endif
-ifeq ($(PLATFORM), OS_OPENBSD)
-        JAVA_INCLUDE = -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/openbsd
-	ROCKSDBJNILIB = librocksdbjni-openbsd$(ARCH).so
-        ROCKSDB_JAR = rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-openbsd$(ARCH).jar
-endif

 libz.a:
 	-rm -rf zlib-$(ZLIB_VER)
@@ -1624,7 +1521,7 @@ libz.a:
 		exit 1; \
 	fi
 	tar xvzf zlib-$(ZLIB_VER).tar.gz
-	cd zlib-$(ZLIB_VER) && CFLAGS='-fPIC ${EXTRA_CFLAGS}' LDFLAGS='${EXTRA_LDFLAGS}' ./configure --static && $(MAKE)
+	cd zlib-$(ZLIB_VER) && CFLAGS='-fPIC ${EXTRA_CFLAGS}' LDFLAGS='${EXTRA_LDFLAGS}' ./configure --static && make
 	cp zlib-$(ZLIB_VER)/libz.a .

 libbz2.a:
@@ -1636,12 +1533,12 @@ libbz2.a:
 		exit 1; \
 	fi
 	tar xvzf bzip2-$(BZIP2_VER).tar.gz
-	cd bzip2-$(BZIP2_VER) && $(MAKE) CFLAGS='-fPIC -O2 -g -D_FILE_OFFSET_BITS=64 ${EXTRA_CFLAGS}' AR='ar ${EXTRA_ARFLAGS}'
+	cd bzip2-$(BZIP2_VER) && make CFLAGS='-fPIC -O2 -g -D_FILE_OFFSET_BITS=64 ${EXTRA_CFLAGS}' AR='ar ${EXTRA_ARFLAGS}'
 	cp bzip2-$(BZIP2_VER)/libbz2.a .

 libsnappy.a:
 	-rm -rf snappy-$(SNAPPY_VER)
-	curl -O -L ${CURL_SSL_OPTS} ${SNAPPY_DOWNLOAD_BASE}/$(SNAPPY_VER)/snappy-$(SNAPPY_VER).tar.gz
+	curl -O -L ${SNAPPY_DOWNLOAD_BASE}/$(SNAPPY_VER)/snappy-$(SNAPPY_VER).tar.gz
 	SNAPPY_SHA256_ACTUAL=`$(SHA256_CMD) snappy-$(SNAPPY_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(SNAPPY_SHA256)" != "$$SNAPPY_SHA256_ACTUAL" ]; then \
 		echo snappy-$(SNAPPY_VER).tar.gz checksum mismatch, expected=\"$(SNAPPY_SHA256)\" actual=\"$$SNAPPY_SHA256_ACTUAL\"; \
@@ -1649,12 +1546,12 @@ libsnappy.a:
 	fi
 	tar xvzf snappy-$(SNAPPY_VER).tar.gz
 	cd snappy-$(SNAPPY_VER) && CFLAGS='${EXTRA_CFLAGS}' CXXFLAGS='${EXTRA_CXXFLAGS}' LDFLAGS='${EXTRA_LDFLAGS}' ./configure --with-pic --enable-static --disable-shared
-	cd snappy-$(SNAPPY_VER) && $(MAKE) ${SNAPPY_MAKE_TARGET}
+	cd snappy-$(SNAPPY_VER) && make ${SNAPPY_MAKE_TARGET}
 	cp snappy-$(SNAPPY_VER)/.libs/libsnappy.a .

 liblz4.a:
 	-rm -rf lz4-$(LZ4_VER)
-	curl -O -L ${CURL_SSL_OPTS} ${LZ4_DOWNLOAD_BASE}/v$(LZ4_VER).tar.gz
+	curl -O -L ${LZ4_DOWNLOAD_BASE}/v$(LZ4_VER).tar.gz
 	mv v$(LZ4_VER).tar.gz lz4-$(LZ4_VER).tar.gz
 	LZ4_SHA256_ACTUAL=`$(SHA256_CMD) lz4-$(LZ4_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(LZ4_SHA256)" != "$$LZ4_SHA256_ACTUAL" ]; then \
@@ -1662,12 +1559,12 @@ liblz4.a:
 		exit 1; \
 	fi
 	tar xvzf lz4-$(LZ4_VER).tar.gz
-	cd lz4-$(LZ4_VER)/lib && $(MAKE) CFLAGS='-fPIC -O2 ${EXTRA_CFLAGS}' all
+	cd lz4-$(LZ4_VER)/lib && make CFLAGS='-fPIC -O2 ${EXTRA_CFLAGS}' all
 	cp lz4-$(LZ4_VER)/lib/liblz4.a .

 libzstd.a:
 	-rm -rf zstd-$(ZSTD_VER)
-	curl -O -L ${CURL_SSL_OPTS} ${ZSTD_DOWNLOAD_BASE}/v$(ZSTD_VER).tar.gz
+	curl -O -L ${ZSTD_DOWNLOAD_BASE}/v$(ZSTD_VER).tar.gz
 	mv v$(ZSTD_VER).tar.gz zstd-$(ZSTD_VER).tar.gz
 	ZSTD_SHA256_ACTUAL=`$(SHA256_CMD) zstd-$(ZSTD_VER).tar.gz | cut -d ' ' -f 1`; \
 	if [ "$(ZSTD_SHA256)" != "$$ZSTD_SHA256_ACTUAL" ]; then \
@@ -1675,45 +1572,29 @@ libzstd.a:
 		exit 1; \
 	fi
 	tar xvzf zstd-$(ZSTD_VER).tar.gz
-	cd zstd-$(ZSTD_VER)/lib && DESTDIR=. PREFIX= $(MAKE) CFLAGS='-fPIC -O2 ${EXTRA_CFLAGS}' install
+	cd zstd-$(ZSTD_VER)/lib && make CFLAGS='-fPIC -O2 ${EXTRA_CFLAGS}' all
 	cp zstd-$(ZSTD_VER)/lib/libzstd.a .

 # A version of each $(LIBOBJECTS) compiled with -fPIC and a fixed set of static compression libraries
-java_static_libobjects = $(patsubst %,jls/%,$(LIB_CC_OBJECTS))
+java_static_libobjects = $(patsubst %,jls/%,$(LIBOBJECTS))
 CLEAN_FILES += jls
-java_static_all_libobjects = $(java_static_libobjects)

 ifneq ($(ROCKSDB_JAVA_NO_COMPRESSION), 1)
 JAVA_COMPRESSIONS = libz.a libbz2.a libsnappy.a liblz4.a libzstd.a
 endif

 JAVA_STATIC_FLAGS = -DZLIB -DBZIP2 -DSNAPPY -DLZ4 -DZSTD
-JAVA_STATIC_INCLUDES = -I./zlib-$(ZLIB_VER) -I./bzip2-$(BZIP2_VER) -I./snappy-$(SNAPPY_VER) -I./lz4-$(LZ4_VER)/lib -I./zstd-$(ZSTD_VER)/lib/include
-
-ifeq ($(HAVE_POWER8),1)
-JAVA_STATIC_C_LIBOBJECTS = $(patsubst %.c.o,jls/%.c.o,$(LIB_SOURCES_C:.c=.o))
-JAVA_STATIC_ASM_LIBOBJECTS = $(patsubst %.S.o,jls/%.S.o,$(LIB_SOURCES_ASM:.S=.o))
-
-java_static_ppc_libobjects = $(JAVA_STATIC_C_LIBOBJECTS) $(JAVA_STATIC_ASM_LIBOBJECTS)
-
-jls/util/crc32c_ppc.o: util/crc32c_ppc.c
-	$(AM_V_CC)$(CC) $(CFLAGS) $(JAVA_STATIC_FLAGS) $(JAVA_STATIC_INCLUDES) -c $< -o $@
-
-jls/util/crc32c_ppc_asm.o: util/crc32c_ppc_asm.S
-	$(AM_V_CC)$(CC) $(CFLAGS) $(JAVA_STATIC_FLAGS) $(JAVA_STATIC_INCLUDES) -c $< -o $@
-
-java_static_all_libobjects += $(java_static_ppc_libobjects)
-endif
+JAVA_STATIC_INCLUDES = -I./zlib-$(ZLIB_VER) -I./bzip2-$(BZIP2_VER) -I./snappy-$(SNAPPY_VER) -I./lz4-$(LZ4_VER)/lib -I./zstd-$(ZSTD_VER)/lib

 $(java_static_libobjects): jls/%.o: %.cc $(JAVA_COMPRESSIONS)
 	$(AM_V_CC)mkdir -p $(@D) && $(CXX) $(CXXFLAGS) $(JAVA_STATIC_FLAGS) $(JAVA_STATIC_INCLUDES) -fPIC -c $< -o $@ $(COVERAGEFLAGS)

-rocksdbjavastatic: $(java_static_all_libobjects)
+rocksdbjavastatic: $(java_static_libobjects)
 	cd java;$(MAKE) javalib;
 	rm -f ./java/target/$(ROCKSDBJNILIB)
 	$(CXX) $(CXXFLAGS) -I./java/. $(JAVA_INCLUDE) -shared -fPIC \
 	  -o ./java/target/$(ROCKSDBJNILIB) $(JNI_NATIVE_SOURCES) \
-	  $(java_static_all_libobjects) $(COVERAGEFLAGS) \
+	  $(java_static_libobjects) $(COVERAGEFLAGS) \
 	  $(JAVA_COMPRESSIONS) $(JAVA_STATIC_LDFLAGS)
 	cd java/target;strip $(STRIPFLAGS) $(ROCKSDBJNILIB)
 	cd java;jar -cf target/$(ROCKSDB_JAR) HISTORY*.md
@@ -1743,14 +1624,6 @@ rocksdbjavastaticreleasedocker: rocksdbjavastatic
 	cd java/target;jar -uf $(ROCKSDB_JAR_ALL) librocksdbjni-*.so librocksdbjni-*.jnilib
 	cd java/target/classes;jar -uf ../$(ROCKSDB_JAR_ALL) org/rocksdb/*.class org/rocksdb/util/*.class

-rocksdbjavastaticdockerppc64le:
-	mkdir -p java/target
-	DOCKER_LINUX_PPC64LE_CONTAINER=`docker ps -aqf name=rocksdb_linux_ppc64le-be`; \
-	if [ -z "$$DOCKER_LINUX_PPC64LE_CONTAINER" ]; then \
-		docker container create --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host --name rocksdb_linux_ppc64le-be evolvedbinary/rocksjava:centos7_ppc64le-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh; \
-	fi
-	docker start -a rocksdb_linux_ppc64le-be
-
 rocksdbjavastaticpublish: rocksdbjavastaticrelease rocksdbjavastaticpublishcentral

 rocksdbjavastaticpublishdocker: rocksdbjavastaticreleasedocker rocksdbjavastaticpublishcentral
@@ -1765,36 +1638,13 @@ rocksdbjavastaticpublishcentral:
 	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH).jar

 # A version of each $(LIBOBJECTS) compiled with -fPIC
-ifeq ($(HAVE_POWER8),1)
-JAVA_CC_OBJECTS = $(SHARED_CC_OBJECTS)
-JAVA_C_OBJECTS = $(SHARED_C_OBJECTS)
-JAVA_ASM_OBJECTS = $(SHARED_ASM_OBJECTS)
-
-JAVA_C_LIBOBJECTS = $(patsubst %.c.o,jl/%.c.o,$(JAVA_C_OBJECTS))
-JAVA_ASM_LIBOBJECTS = $(patsubst %.S.o,jl/%.S.o,$(JAVA_ASM_OBJECTS))
-endif
-
-java_libobjects = $(patsubst %,jl/%,$(LIB_CC_OBJECTS))
+java_libobjects = $(patsubst %,jl/%,$(LIBOBJECTS))
 CLEAN_FILES += jl
-java_all_libobjects = $(java_libobjects)
-
-ifeq ($(HAVE_POWER8),1)
-java_ppc_libobjects = $(JAVA_C_LIBOBJECTS) $(JAVA_ASM_LIBOBJECTS)
-
-jl/crc32c_ppc.o: util/crc32c_ppc.c
-	$(AM_V_CC)$(CC) $(CFLAGS) -c $< -o $@
-
-jl/crc32c_ppc_asm.o: util/crc32c_ppc_asm.S
-	$(AM_V_CC)$(CC) $(CFLAGS) -c $< -o $@
-java_all_libobjects += $(java_ppc_libobjects)
-endif

 $(java_libobjects): jl/%.o: %.cc
 	$(AM_V_CC)mkdir -p $(@D) && $(CXX) $(CXXFLAGS) -fPIC -c $< -o $@ $(COVERAGEFLAGS)

-
-
-rocksdbjava: $(java_all_libobjects)
+rocksdbjava: $(java_libobjects)
 	$(AM_V_GEN)cd java;$(MAKE) javalib;
 	$(AM_V_at)rm -f ./java/target/$(ROCKSDBJNILIB)
 	$(AM_V_at)$(CXX) $(CXXFLAGS) -I./java/. $(JAVA_INCLUDE) -shared -fPIC -o ./java/target/$(ROCKSDBJNILIB) $(JNI_NATIVE_SOURCES) $(java_libobjects) $(JAVA_LDFLAGS) $(COVERAGEFLAGS)
@@ -1849,54 +1699,30 @@ IOSVERSION=$(shell defaults read $(PLATFORMSROOT)/iPhoneOS.platform/version CFBu
 	lipo ios-x86/$@ ios-arm/$@ -create -output $@

 else
-ifeq ($(HAVE_POWER8),1)
-util/crc32c_ppc.o: util/crc32c_ppc.c
-	$(AM_V_CC)$(CC) $(CFLAGS) -c $< -o $@
-
-util/crc32c_ppc_asm.o: util/crc32c_ppc_asm.S
-	$(AM_V_CC)$(CC) $(CFLAGS) -c $< -o $@
-endif
 .cc.o:
 	$(AM_V_CC)$(CXX) $(CXXFLAGS) -c $< -o $@ $(COVERAGEFLAGS)

 .c.o:
 	$(AM_V_CC)$(CC) $(CFLAGS) -c $< -o $@
 endif
+
 # ---------------------------------------------------------------------------
 #  	Source files dependencies detection
 # ---------------------------------------------------------------------------

 all_sources = $(LIB_SOURCES) $(MAIN_SOURCES) $(MOCK_LIB_SOURCES) $(TOOL_LIB_SOURCES) $(BENCH_LIB_SOURCES) $(TEST_LIB_SOURCES) $(EXP_LIB_SOURCES)
-DEPFILES = $(all_sources:.cc=.cc.d)
+DEPFILES = $(all_sources:.cc=.d)

 # Add proper dependency support so changing a .h file forces a .cc file to
 # rebuild.

 # The .d file indicates .cc file's dependencies on .h files. We generate such
 # dependency by g++'s -MM option, whose output is a make dependency rule.
-%.cc.d: %.cc
+$(DEPFILES): %.d: %.cc
 	@$(CXX) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) \
 	  -MM -MT'$@' -MT'$(<:.cc=.o)' "$<" -o '$@'

-ifeq ($(HAVE_POWER8),1)
-DEPFILES_C = $(LIB_SOURCES_C:.c=.c.d)
-DEPFILES_ASM = $(LIB_SOURCES_ASM:.S=.S.d)
-
-%.c.d: %.c
-	@$(CXX) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) \
-	  -MM -MT'$@' -MT'$(<:.c=.o)' "$<" -o '$@'
-
-%.S.d: %.S
-	@$(CXX) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) \
-	  -MM -MT'$@' -MT'$(<:.S=.o)' "$<" -o '$@'
-
-$(DEPFILES_C): %.c.d
-
-$(DEPFILES_ASM): %.S.d
-depend: $(DEPFILES) $(DEPFILES_C) $(DEPFILES_ASM)
-else
 depend: $(DEPFILES)
-endif

 # if the make goal is either "clean" or "format", we shouldn't
 # try to import the *.d files.
@@ -1,8 +1,7 @@
 ## RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

-[![Linux/Mac Build Status](https://travis-ci.org/facebook/rocksdb.svg?branch=master)](https://travis-ci.org/facebook/rocksdb)
-[![Windows Build status](https://ci.appveyor.com/api/projects/status/fbgfu0so3afcno78/branch/master?svg=true)](https://ci.appveyor.com/project/Facebook/rocksdb/branch/master)
-[![PPC64le Build Status](http://140.211.168.68:8080/buildStatus/icon?job=Rocksdb)](http://140.211.168.68:8080/job/Rocksdb)
+[![Build Status](https://travis-ci.org/facebook/rocksdb.svg?branch=master)](https://travis-ci.org/facebook/rocksdb)
+[![Build status](https://ci.appveyor.com/api/projects/status/fbgfu0so3afcno78/branch/master?svg=true)](https://ci.appveyor.com/project/Facebook/rocksdb/branch/master)


 RocksDB is developed and maintained by Facebook Database Engineering Team.
@@ -26,7 +25,3 @@ rely on the details of any other header files in this package.  Those
 internal APIs may be changed without warning.

 Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/
-
-## License
-
-RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory).  You may select, at your option, one of the above-listed licenses.
@@ -5,7 +5,7 @@ RocksDBLite is a project focused on mobile use cases, which don't need a lot of
 Some examples of the features disabled by ROCKSDB_LITE:
 * compiled-in support for LDB tool
 * No backupable DB
-* No support for replication (which we provide in form of TransactionalIterator)
+* No support for replication (which we provide in form of TrasactionalIterator)
 * No advanced monitoring tools
 * No special-purpose memtables that are highly optimized for specific use cases
 * No Transactions
@@ -5,14 +5,12 @@ At Facebook, we use RocksDB as storage engines in multiple data management servi

 1. MyRocks -- https://github.com/MySQLOnRocksDB/mysql-5.6
 2. MongoRocks -- https://github.com/mongodb-partners/mongo-rocks
-3. ZippyDB --  Facebook's distributed key-value store with Paxos-style replication, built on top of RocksDB.[1] https://www.youtube.com/watch?v=DfiN7pG0D0khtt
-4. Laser -- Laser is a high query throughput, low (millisecond) latency, key-value storage service built on top of RocksDB.[1]
+3. ZippyDB --  Facebook's distributed key-value store with Paxos-style replication, built on top of RocksDB.[*] https://www.youtube.com/watch?v=DfiN7pG0D0khtt
+4. Laser -- Laser is a high query throughput, low (millisecond) latency, key-value storage service built on top of RocksDB.[*]
 4. Dragon -- a distributed graph query engine. https://code.facebook.com/posts/1737605303120405/dragon-a-distributed-graph-query-engine/
-5. Stylus -- a low-level stream processing framework writtenin C++.[1]
-6. LogDevice -- a distributed data store for logs [2]
+5. Stylus -- a low-level stream processing framework writtenin C++.[*]

-[1] https://research.facebook.com/publications/realtime-data-processing-at-facebook/
-[2] https://code.facebook.com/posts/357056558062811/logdevice-a-distributed-data-store-for-logs/
+[*] https://research.facebook.com/publications/realtime-data-processing-at-facebook/

 ## LinkedIn
 Two different use cases at Linkedin are using RocksDB as a storage engine:
@@ -78,13 +76,7 @@ quasardb uses a heavily tuned RocksDB as its persistence layer.
 [Dgraph](https://github.com/dgraph-io/dgraph) is an open-source, scalable, distributed, low latency, high throughput Graph database .They use RocksDB to store state locally on a machine.

 ## Uber
-[Uber](http://eng.uber.com/cherami/) uses RocksDB as a durable and scalable task queue.
+[Uber](http://eng.uber.com/cherami/) uses RocksDB as a durable and and scalable task queue.

 ## 360 Pika
 [360](http://www.360.cn/) [Pika](https://github.com/Qihoo360/pika) is a nosql compatible with redis. With the huge amount of data stored, redis may suffer for a capacity bottleneck, and pika was born for solving it. It has widely been widely used in many company
-
-## LzLabs
-LzLabs is using RocksDB as a storage engine in their multi-database distributed framework to store application configuration and user data.
-
-## ProfaneDB
-[ProfaneDB](https://profanedb.gitlab.io/) is a database for Protocol Buffers, and uses RocksDB for storage. It is accessible via gRPC, and the schema is defined using directly `.proto` files.
@@ -14,11 +14,6 @@ Vagrant.configure("2") do |config|
    box.vm.box = "chef/centos-6.5"
  end

-  config.vm.define "centos7" do |box|
-    box.vm.box = "centos/7"
-    box.vm.provision "shell", path: "build_tools/setup_centos7.sh"
-  end
-
  config.vm.define "FreeBSD10" do |box|
    box.vm.guest = :freebsd
    box.vm.box = "robin/freebsd-10"
@@ -1,14 +1,14 @@
 version: 1.0.{build}
-image: Visual Studio 2017
+image: Visual Studio 2015
 before_build:
 - md %APPVEYOR_BUILD_FOLDER%\build
 - cd %APPVEYOR_BUILD_FOLDER%\build
- cmake -G "Visual Studio 15 Win64" -DOPTDBG=1 -DWITH_XPRESS=1 -DPORTABLE=1 ..
+- cmake -G "Visual Studio 14 2015 Win64" -DOPTDBG=1 -DXPRESS=1 ..
 - cd ..
 build:
  project: build\rocksdb.sln
  parallel: true
-  verbosity: normal
+  verbosity: minimal
 test:
 test_script:
 - ps: build_tools\run_ci_db_test.ps1 -SuiteRun db_basic_test,db_test2,db_test,env_basic_test,env_test -Concurrency 8
@@ -0,0 +1,2 @@
+arcanist_util are only used internaly, If you want to change it please check
+<internal_rocksdb_repo>/arcanist_util
@@ -36,7 +36,7 @@ def parse_src_mk(repo_path):
 # get all .cc / .c files
 def get_cc_files(repo_path):
    cc_files = []
-    for root, dirnames, filenames in os.walk(repo_path):  # noqa: B007 T25377293 Grandfathered in
+    for root, dirnames, filenames in os.walk(repo_path):
        root = root[(len(repo_path) + 1):]
        if "java" in root:
            # Skip java
@@ -1,5 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 # Create a tmp directory for the test to use
 TEST_DIR=$(mktemp -d /dev/shm/fbcode_rocksdb_XXXXXXX)
-# shellcheck disable=SC2068
 TEST_TMPDIR="$TEST_DIR" $@ && rm -rf "$TEST_DIR"
@@ -3,17 +3,19 @@ from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals
 import targets_cfg
+import pprint

-def pretty_list(lst, indent=8):
+# TODO(tec): replace this with PrettyPrinter
+def pretty_list(lst, indent=6):
    if lst is None or len(lst) == 0:
        return ""

    if len(lst) == 1:
        return "\"%s\"" % lst[0]
-    
+
    separator = "\",\n%s\"" % (" " * indent)
-    res = separator.join(sorted(lst))
-    res = "\n" + (" " * indent) + "\"" + res + "\",\n" + (" " * (indent - 4))
+    res = separator.join(lst)
+    res = "\n" + (" " * indent) + "\"" + res + "\",\n" + (" " * (indent - 2))
    return res


@@ -25,7 +27,7 @@ class TARGETSBuilder:
        self.total_lib = 0
        self.total_bin = 0
        self.total_test = 0
-        self.tests_cfg = ""
+        self.tests_cfg = []

    def __del__(self):
        self.targets_file.close()
@@ -35,8 +37,8 @@ class TARGETSBuilder:
            headers = "AutoHeaders.RECURSIVE_GLOB"
        self.targets_file.write(targets_cfg.library_template % (
            name,
-            pretty_list(srcs),
            headers,
+            pretty_list(srcs),
            pretty_list(deps)))
        self.total_lib = self.total_lib + 1

@@ -51,13 +53,13 @@ class TARGETSBuilder:
        exec_mode = "serial"
        if is_parallel:
            exec_mode = "parallel"
-        self.tests_cfg += targets_cfg.test_cfg_template % (
-            test_name,
-            str(src),
-            str(exec_mode))
+        self.tests_cfg.append([test_name, str(src), str(exec_mode)])

        self.total_test = self.total_test + 1

    def flush_tests(self):
-        self.targets_file.write(targets_cfg.unittests_template % self.tests_cfg)
-        self.tests_cfg = ""
+        self.targets_file.write(targets_cfg.unittests_template % (
+            pprint.PrettyPrinter().pformat(self.tests_cfg)
+        ))
+
+        self.tests_cfg = []
@@ -2,144 +2,119 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals
-rocksdb_target_header = """REPO_PATH = package_name() + "/"
+rocksdb_target_header = """
+import os

+TARGETS_PATH = os.path.dirname(__file__)
+REPO_PATH = TARGETS_PATH[(TARGETS_PATH.find('fbcode/') + len('fbcode/')):] + "/"
 BUCK_BINS = "buck-out/gen/" + REPO_PATH
-
 TEST_RUNNER = REPO_PATH + "buckifier/rocks_test_runner.sh"
-
 rocksdb_compiler_flags = [
-    "-fno-builtin-memcmp",
-    "-DROCKSDB_PLATFORM_POSIX",
-    "-DROCKSDB_LIB_IO_POSIX",
-    "-DROCKSDB_FALLOCATE_PRESENT",
-    "-DROCKSDB_MALLOC_USABLE_SIZE",
-    "-DROCKSDB_RANGESYNC_PRESENT",
-    "-DROCKSDB_SCHED_GETCPU_PRESENT",
-    "-DROCKSDB_SUPPORT_THREAD_LOCAL",
-    "-DOS_LINUX",
-    # Flags to enable libs we include
-    "-DSNAPPY",
-    "-DZLIB",
-    "-DBZIP2",
-    "-DLZ4",
-    "-DZSTD",
-    "-DGFLAGS=gflags",
-    "-DNUMA",
-    "-DTBB",
-    # Needed to compile in fbcode
-    "-Wno-expansion-to-defined",
+  "-msse",
+  "-msse4.2",
+  "-fno-builtin-memcmp",
+  "-DROCKSDB_PLATFORM_POSIX",
+  "-DROCKSDB_LIB_IO_POSIX",
+  "-DROCKSDB_FALLOCATE_PRESENT",
+  "-DROCKSDB_MALLOC_USABLE_SIZE",
+  "-DROCKSDB_RANGESYNC_PRESENT",
+  "-DROCKSDB_SCHED_GETCPU_PRESENT",
+  "-DROCKSDB_SUPPORT_THREAD_LOCAL",
+  "-DHAVE_SSE42",
+  "-DOS_LINUX",
+  # Flags to enable libs we include
+  "-DSNAPPY",
+  "-DZLIB",
+  "-DBZIP2",
+  "-DLZ4",
+  "-DZSTD",
+  "-DGFLAGS=gflags",
+  "-DNUMA",
+  "-DTBB",
+  # Needed to compile in fbcode
+  "-Wno-expansion-to-defined",
 ]

 rocksdb_external_deps = [
-    ("bzip2", None, "bz2"),
-    ("snappy", None, "snappy"),
-    ("zlib", None, "z"),
-    ("gflags", None, "gflags"),
-    ("lz4", None, "lz4"),
-    ("zstd", None),
-    ("tbb", None),
-    ("numa", None, "numa"),
-    ("googletest", None, "gtest"),
+  ('bzip2', None, 'bz2'),
+  ('snappy', None, "snappy"),
+  ('zlib', None, 'z'),
+  ('gflags', None, 'gflags'),
+  ('lz4', None, 'lz4'),
+  ('zstd', None),
+  ('tbb', None),
+  ("numa", None, "numa"),
+  ("googletest", None, "gtest"),
 ]

 rocksdb_preprocessor_flags = [
-    # Directories with files for #include
-    "-I" + REPO_PATH + "include/",
-    "-I" + REPO_PATH,
+  # Directories with files for #include
+  "-I" + REPO_PATH + "include/",
+  "-I" + REPO_PATH,
 ]
-
-rocksdb_arch_preprocessor_flags = {
-    "x86_64": [
-        "-DHAVE_SSE42",
-        "-DHAVE_PCLMUL",
-    ],
-}
-
-build_mode = read_config("fbcode", "build_mode")
-
-is_opt_mode = build_mode.startswith("opt")
-
-# -DNDEBUG is added by default in opt mode in fbcode. But adding it twice
-# doesn't harm and avoid forgetting to add it.
-if is_opt_mode:
-    rocksdb_compiler_flags.append("-DNDEBUG")
 """


 library_template = """
 cpp_library(
    name = "%s",
-    srcs = [%s],
    headers = %s,
-    arch_preprocessor_flags = rocksdb_arch_preprocessor_flags,
-    compiler_flags = rocksdb_compiler_flags,
-    preprocessor_flags = rocksdb_preprocessor_flags,
+    srcs = [%s],
    deps = [%s],
+    preprocessor_flags = rocksdb_preprocessor_flags,
+    compiler_flags = rocksdb_compiler_flags,
    external_deps = rocksdb_external_deps,
 )
 """

 binary_template = """
 cpp_binary(
-    name = "%s",
-    srcs = [%s],
-    arch_preprocessor_flags = rocksdb_arch_preprocessor_flags,
-    compiler_flags = rocksdb_compiler_flags,
-    preprocessor_flags = rocksdb_preprocessor_flags,
-    deps = [%s],
-    external_deps = rocksdb_external_deps,
+  name = "%s",
+  srcs = [%s],
+  deps = [%s],
+  preprocessor_flags = rocksdb_preprocessor_flags,
+  compiler_flags = rocksdb_compiler_flags,
+  external_deps = rocksdb_external_deps,
 )
 """

-test_cfg_template = """    [
-        "%s",
-        "%s",
-        "%s",
-    ],
-"""
-
 unittests_template = """
 # [test_name, test_src, test_type]
-ROCKS_TESTS = [
-%s]
+ROCKS_TESTS = %s
+

 # Generate a test rule for each entry in ROCKS_TESTS
-# Do not build the tests in opt mode, since SyncPoint and other test code
-# will not be included.
-if not is_opt_mode:
-    for test_cfg in ROCKS_TESTS:
-        test_name = test_cfg[0]
-        test_cc = test_cfg[1]
-        ttype = "gtest" if test_cfg[2] == "parallel" else "simple"
-        test_bin = test_name + "_bin"
+for test_cfg in ROCKS_TESTS:
+    test_name = test_cfg[0]
+    test_cc = test_cfg[1]
+    ttype = "gtest" if test_cfg[2] == "parallel" else "simple"
+    test_bin = test_name + "_bin"

-        cpp_binary (
-          name = test_bin,
-          srcs = [test_cc],
-          deps = [":rocksdb_test_lib"],
-          preprocessor_flags = rocksdb_preprocessor_flags,
-          arch_preprocessor_flags = rocksdb_arch_preprocessor_flags,
-          compiler_flags = rocksdb_compiler_flags,
-          external_deps = rocksdb_external_deps,
-        )
+    cpp_binary (
+      name = test_bin,
+      srcs = [test_cc],
+      deps = [":rocksdb_test_lib"],
+      preprocessor_flags = rocksdb_preprocessor_flags,
+      compiler_flags = rocksdb_compiler_flags,
+      external_deps = rocksdb_external_deps,
+    )

-        custom_unittest(
-          name = test_name,
-          type = ttype,
-          deps = [":" + test_bin],
-          command = [TEST_RUNNER, BUCK_BINS + test_bin]
-        )
+    custom_unittest(
+      name = test_name,
+      type = ttype,
+      deps = [":" + test_bin],
+      command = [TEST_RUNNER, BUCK_BINS + test_bin]
+    )

 custom_unittest(
    name = "make_rocksdbjavastatic",
-    command = ["internal_repo_rocksdb/make_rocksdbjavastatic.sh"],
    type = "simple",
+    command = ["internal_repo_rocksdb/make_rocksdbjavastatic.sh"],
 )

 custom_unittest(
    name = "make_rocksdb_lite_release",
-    command = ["internal_repo_rocksdb/make_rocksdb_lite_release.sh"],
    type = "simple",
+    command = ["internal_repo_rocksdb/make_rocksdb_lite_release.sh"],
 )
 """
@@ -1,377 +0,0 @@
-<?php
-// Copyright 2004-present Facebook. All Rights Reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-// Name of the environment variables which need to be set by the entity which
-// triggers continuous runs so that code at the end of the file gets executed
-// and Sandcastle run starts.
-define("ENV_POST_RECEIVE_HOOK", "POST_RECEIVE_HOOK");
-define("ENV_HTTPS_APP_VALUE", "HTTPS_APP_VALUE");
-define("ENV_HTTPS_TOKEN_VALUE", "HTTPS_TOKEN_VALUE");
-
-define("PRIMARY_TOKEN_FILE", '/home/krad/.sandcastle');
-define("CONT_RUN_ALIAS", "leveldb");
-
-//////////////////////////////////////////////////////////////////////
-/*  Run tests in sandcastle */
-function postURL($diffID, $url) {
-  assert(strlen($diffID) > 0);
-  assert(is_numeric($diffID));
-  assert(strlen($url) > 0);
-
-  $cmd_args = array(
-    'diff_id' => (int)$diffID,
-    'name' => sprintf(
-      'click here for sandcastle tests for D%d',
-      (int)$diffID
-    ),
-    'link' => $url
-  );
-  $cmd = 'echo ' . escapeshellarg(json_encode($cmd_args))
-         . ' | arc call-conduit differential.updateunitresults';
-
-  shell_exec($cmd);
-}
-
-function buildUpdateTestStatusCmd($diffID, $test, $status) {
-  assert(strlen($diffID) > 0);
-  assert(is_numeric($diffID));
-  assert(strlen($test) > 0);
-  assert(strlen($status) > 0);
-
-  $cmd_args = array(
-    'diff_id' => (int)$diffID,
-    'name' => $test,
-    'result' => $status
-  );
-
-  $cmd = 'echo ' . escapeshellarg(json_encode($cmd_args))
-         . ' | arc call-conduit differential.updateunitresults';
-
-  return $cmd;
-}
-
-function updateTestStatus($diffID, $test) {
-  assert(strlen($diffID) > 0);
-  assert(is_numeric($diffID));
-  assert(strlen($test) > 0);
-
-  shell_exec(buildUpdateTestStatusCmd($diffID, $test, "waiting"));
-}
-
-function getSteps($applyDiff, $diffID, $username, $test) {
-  assert(strlen($username) > 0);
-  assert(strlen($test) > 0);
-
-  if ($applyDiff) {
-    assert(strlen($diffID) > 0);
-    assert(is_numeric($diffID));
-
-    $arcrc_content = (PHP_OS == "Darwin" ?
-        exec("cat ~/.arcrc | gzip -f | base64") :
-            exec("cat ~/.arcrc | gzip -f | base64 -w0"));
-    assert(strlen($arcrc_content) > 0);
-
-    // Sandcastle machines don't have arc setup. We copy the user certificate
-    // and authenticate using that in Sandcastle.
-    $setup = array(
-      "name" => "Setup arcrc",
-      "shell" => "echo " . escapeshellarg($arcrc_content) . " | base64 --decode"
-                 . " | gzip -d > ~/.arcrc",
-      "user" => "root"
-    );
-
-    // arc demands certain permission on its config.
-    // also fix the sticky bit issue in sandcastle
-    $fix_permission = array(
-      "name" => "Fix environment",
-      "shell" => "chmod 600 ~/.arcrc && chmod +t /dev/shm",
-      "user" => "root"
-    );
-
-    // Construct the steps in the order of execution.
-    $steps[] = $setup;
-    $steps[] = $fix_permission;
-  }
-
-  // fbcode is a sub-repo. We cannot patch until we add it to ignore otherwise
-  // Git thinks it is an uncommited change.
-  $fix_git_ignore = array(
-    "name" => "Fix git ignore",
-    "shell" => "echo fbcode >> .git/info/exclude",
-    "user" => "root"
-  );
-
-  // This fixes "FATAL: ThreadSanitizer can not mmap the shadow memory"
-  // Source:
-  // https://github.com/google/sanitizers/wiki/ThreadSanitizerCppManual#FAQ
-  $fix_kernel_issue = array(
-    "name" => "Fix kernel issue with tsan",
-    "shell" => "echo 2 >/proc/sys/kernel/randomize_va_space",
-    "user" => "root"
-  );
-
-  $steps[] = $fix_git_ignore;
-  $steps[] = $fix_kernel_issue;
-
-  // This will be the command used to execute particular type of tests.
-  $cmd = "";
-
-  if ($applyDiff) {
-    // Patch the code (keep your fingures crossed).
-    $patch = array(
-      "name" => "Patch " . $diffID,
-      "shell" => "arc --arcrc-file ~/.arcrc "
-                  . "patch --nocommit --diff " . escapeshellarg($diffID),
-      "user" => "root"
-    );
-
-    $steps[] = $patch;
-
-    updateTestStatus($diffID, $test);
-    $cmd = buildUpdateTestStatusCmd($diffID, $test, "running") . "; ";
-  }
-
-  // Run the actual command.
-  $cmd = $cmd . "J=$(nproc) ./build_tools/precommit_checker.py " .
-           escapeshellarg($test) . "; exit_code=$?; ";
-
-  if ($applyDiff) {
-    $cmd = $cmd . "([[ \$exit_code -eq 0 ]] &&"
-                . buildUpdateTestStatusCmd($diffID, $test, "pass") . ")"
-                . "||" . buildUpdateTestStatusCmd($diffID, $test, "fail")
-                . "; ";
-  }
-
-  // shell command to sort the tests based on exit code and print
-  // the output of the log files.
-  $cat_sorted_logs = "
-    while read code log_file;
-      do echo \"################ cat \$log_file [exit_code : \$code] ################\";
-      cat \$log_file;
-    done < <(tail -n +2 LOG | sort -k7,7n -k4,4gr | awk '{print \$7,\$NF}')";
-
-  // Shell command to cat all log files
-  $cat_all_logs = "for f in `ls t/!(run-*)`; do echo \$f;cat \$f; done";
-
-  // If LOG file exist use it to cat log files sorted by exit code, otherwise
-  // cat everything
-  $logs_cmd = "if [ -f LOG ]; then {$cat_sorted_logs}; else {$cat_all_logs}; fi";
-
-  $cmd = $cmd . " cat /tmp/precommit-check.log"
-              . "; shopt -s extglob; {$logs_cmd}"
-              . "; shopt -u extglob; [[ \$exit_code -eq 0 ]]";
-  assert(strlen($cmd) > 0);
-
-  $run_test = array(
-    "name" => "Run " . $test,
-    "shell" => $cmd,
-    "user" => "root",
-    "parser" => "python build_tools/error_filter.py " . escapeshellarg($test),
-  );
-
-  $steps[] = $run_test;
-
-  if ($applyDiff) {
-    // Clean up the user arc config we are using.
-    $cleanup = array(
-      "name" => "Arc cleanup",
-      "shell" => "rm -f ~/.arcrc",
-      "user" => "root"
-    );
-
-    $steps[] = $cleanup;
-  }
-
-  assert(count($steps) > 0);
-  return $steps;
-}
-
-function getSandcastleConfig() {
-  $sandcastle_config = array();
-
-  $cwd = getcwd();
-  $cwd_token_file = "{$cwd}/.sandcastle";
-  // This is a case when we're executed from a continuous run. Fetch the values
-  // from the environment.
-  if (getenv(ENV_POST_RECEIVE_HOOK)) {
-    $sandcastle_config[0] = getenv(ENV_HTTPS_APP_VALUE);
-    $sandcastle_config[1] = getenv(ENV_HTTPS_TOKEN_VALUE);
-  } else {
-    // This is a typical `[p]arc diff` case. Fetch the values from the specific
-    // configuration files.
-    for ($i = 0; $i < 50; $i++) {
-      if (file_exists(PRIMARY_TOKEN_FILE) ||
-          file_exists($cwd_token_file)) {
-        break;
-      }
-      // If we failed to fetch the tokens, sleep for 0.2 second and try again
-      usleep(200000);
-    }
-    assert(file_exists(PRIMARY_TOKEN_FILE) ||
-           file_exists($cwd_token_file));
-
-    // Try the primary location first, followed by a secondary.
-    if (file_exists(PRIMARY_TOKEN_FILE)) {
-      $cmd = 'cat ' . PRIMARY_TOKEN_FILE;
-    } else {
-      $cmd = 'cat ' . escapeshellarg($cwd_token_file);
-    }
-
-    assert(strlen($cmd) > 0);
-    $sandcastle_config = explode(':', rtrim(shell_exec($cmd)));
-  }
-
-  // In this case be very explicit about the implications.
-  if (count($sandcastle_config) != 2) {
-    echo "Sandcastle configuration files don't contain valid information " .
-         "or the necessary environment variables aren't defined. Unable " .
-         "to validate the code changes.";
-    exit(1);
-  }
-
-  assert(strlen($sandcastle_config[0]) > 0);
-  assert(strlen($sandcastle_config[1]) > 0);
-  assert(count($sandcastle_config) > 0);
-
-  return $sandcastle_config;
-}
-
-// This function can be called either from `[p]arc diff` command or during
-// the Git post-receive hook.
- function startTestsInSandcastle($applyDiff, $workflow, $diffID) {
-  // Default options don't terminate on failure, but that's what we want. In
-  // the current case we use assertions intentionally as "terminate on failure
-  // invariants".
-  assert_options(ASSERT_BAIL, true);
-
-  // In case of a diff we'll send notificatios to the author. Else it'll go to
-  // the entire team because failures indicate that build quality has regressed.
-  $username = $applyDiff ? exec("whoami") : CONT_RUN_ALIAS;
-  assert(strlen($username) > 0);
-
-  if ($applyDiff) {
-    assert($workflow);
-    assert(strlen($diffID) > 0);
-    assert(is_numeric($diffID));
-  }
-
-  // List of tests we want to run in Sandcastle.
-  $tests = array("unit", "unit_non_shm", "unit_481", "clang_unit", "tsan",
-                 "asan", "lite_test", "valgrind", "release", "release_481",
-                 "clang_release", "clang_analyze", "code_cov",
-                 "java_build", "no_compression", "unity", "ubsan");
-
-  $send_email_template = array(
-    'type' => 'email',
-    'triggers' => array('fail'),
-    'emails' => array($username . '@fb.com'),
-  );
-
-  // Construct a job definition for each test and add it to the master plan.
-  foreach ($tests as $test) {
-    $stepName = "RocksDB diff " . $diffID . " test " . $test;
-
-    if (!$applyDiff) {
-      $stepName = "RocksDB continuous integration test " . $test;
-    }
-
-    $arg[] = array(
-      "name" => $stepName,
-      "report" => array($send_email_template),
-      "steps" => getSteps($applyDiff, $diffID, $username, $test)
-    );
-  }
-
-  // We cannot submit the parallel execution master plan to Sandcastle and
-  // need supply the job plan as a determinator. So we construct a small job
-  // that will spit out the master job plan which Sandcastle will parse and
-  // execute. Why compress the job definitions? Otherwise we run over the max
-  // string size.
-  $cmd = "echo " . base64_encode(json_encode($arg))
-         . (PHP_OS == "Darwin" ?
-             " | gzip -f | base64" :
-                 " | gzip -f | base64 -w0");
-  assert(strlen($cmd) > 0);
-
-  $arg_encoded = shell_exec($cmd);
-  assert(strlen($arg_encoded) > 0);
-
-  $runName = "Run diff " . $diffID . "for user " . $username;
-
-  if (!$applyDiff) {
-    $runName = "RocksDB continuous integration build and test run";
-  }
-
-  $command = array(
-    "name" => $runName,
-    "steps" => array()
-  );
-
-  $command["steps"][] = array(
-    "name" => "Generate determinator",
-    "shell" => "echo " . $arg_encoded . " | base64 --decode | gzip -d"
-               . " | base64 --decode",
-    "determinator" => true,
-    "user" => "root"
-  );
-
-  // Submit to Sandcastle.
-  $url = 'https://interngraph.intern.facebook.com/sandcastle/create';
-
-  $job = array(
-    'command' => 'SandcastleUniversalCommand',
-    'args' => $command,
-    'capabilities' => array(
-      'vcs' => 'rocksdb-int-git',
-      'type' => 'lego',
-    ),
-    'hash' => 'origin/master',
-    'user' => $username,
-    'alias' => 'rocksdb-precommit',
-    'tags' => array('rocksdb'),
-    'description' => 'Rocksdb precommit job',
-  );
-
-  // Fetch the configuration necessary to submit a successful HTTPS request.
-  $sandcastle_config = getSandcastleConfig();
-
-  $app = $sandcastle_config[0];
-  $token = $sandcastle_config[1];
-
-  $cmd = 'curl -s -k '
-          . ' -F app=' . escapeshellarg($app)
-          . ' -F token=' . escapeshellarg($token)
-          . ' -F job=' . escapeshellarg(json_encode($job))
-          .' ' . escapeshellarg($url);
-
-  $output = shell_exec($cmd);
-  assert(strlen($output) > 0);
-
-  // Extract Sandcastle URL from the response.
-  preg_match('/url": "(.+)"/', $output, $sandcastle_url);
-
-  assert(count($sandcastle_url) > 0, "Unable to submit Sandcastle request.");
-  assert(strlen($sandcastle_url[1]) > 0, "Unable to extract Sandcastle URL.");
-
-  if ($applyDiff) {
-    echo "\nSandcastle URL: " . $sandcastle_url[1] . "\n";
-    // Ask Phabricator to display it on the diff UI.
-    postURL($diffID, $sandcastle_url[1]);
-  } else {
-    echo "Continuous integration started Sandcastle tests. You can look at ";
-    echo "the progress at:\n" . $sandcastle_url[1] . "\n";
-  }
-}
-
-// Continuous run cript will set the environment variable and based on that
-// we'll trigger the execution of tests in Sandcastle. In that case we don't
-// need to apply any diffs and there's no associated workflow either.
-if (getenv(ENV_POST_RECEIVE_HOOK)) {
-  startTestsInSandcastle(
-    false /* $applyDiff */,
-    NULL /* $workflow */,
-    NULL /* $diffID */);
-}
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 #
 # Detects OS we're compiling on and outputs a file specified by the first
 # argument, which in turn gets read while processing Makefile.
@@ -16,8 +16,6 @@
 #   PLATFORM_CXXFLAGS           C++ compiler flags.  Will contain:
 #   PLATFORM_SHARED_VERSIONED   Set to 'true' if platform supports versioned
 #                               shared libraries, empty otherwise.
-#   FIND			Command for the find utility
-#   WATCH			Command for the watch utility
 #
 # The PLATFORM_CCFLAGS and PLATFORM_CXXFLAGS might include the following:
 #
@@ -53,11 +51,13 @@ if [ -z "$ROCKSDB_NO_FBCODE" -a -d /mnt/gvfs/third-party ]; then
    FBCODE_BUILD="true"
    # If we're compiling with TSAN we need pic build
    PIC_BUILD=$COMPILE_WITH_TSAN
-    if [ -z "$ROCKSDB_FBCODE_BUILD_WITH_481" ]; then
-      source "$PWD/build_tools/fbcode_config.sh"
-    else
+    if [ -n "$ROCKSDB_FBCODE_BUILD_WITH_481" ]; then
      # we need this to build with MySQL. Don't use for other purposes.
      source "$PWD/build_tools/fbcode_config4.8.1.sh"
+    elif [ -n "$ROCKSDB_FBCODE_BUILD_WITH_5xx" ]; then
+      source "$PWD/build_tools/fbcode_config.sh"
+    else
+      source "$PWD/build_tools/fbcode_config_platform007.sh"
    fi
 fi

@@ -66,19 +66,11 @@ rm -f "$OUTPUT"
 touch "$OUTPUT"

 if test -z "$CC"; then
-    if [ -x "$(command -v clang)" ]; then
-        CC=clang
-    else
-        CC=cc
-    fi
+   CC=cc
 fi

 if test -z "$CXX"; then
-    if [ -x "$(command -v clang++)" ]; then
-        CXX=clang++
-    else
-        CXX=g++
-    fi
+    CXX=g++
 fi

 # Detect OS
@@ -95,15 +87,7 @@ if test -z "$CLANG_SCAN_BUILD"; then
 fi

 if test -z "$CLANG_ANALYZER"; then
-    CLANG_ANALYZER=$(command -v clang++ 2> /dev/null)
-fi
-
-if test -z "$FIND"; then
-    FIND=find
-fi
-
-if test -z "$WATCH"; then
-    WATCH=watch
+    CLANG_ANALYZER=$(which clang++ 2> /dev/null)
 fi

 COMMON_FLAGS="$COMMON_FLAGS ${CFLAGS}"
@@ -159,7 +143,6 @@ case "$TARGET_OS" in
        ;;
    FreeBSD)
        PLATFORM=OS_FREEBSD
-        CXX=clang++
        COMMON_FLAGS="$COMMON_FLAGS -fno-builtin-memcmp -D_REENTRANT -DOS_FREEBSD"
        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lpthread"
        # PORT_FILES=port/freebsd/freebsd_specific.cc
@@ -172,12 +155,9 @@ case "$TARGET_OS" in
        ;;
    OpenBSD)
        PLATFORM=OS_OPENBSD
-	CXX=clang++
        COMMON_FLAGS="$COMMON_FLAGS -fno-builtin-memcmp -D_REENTRANT -DOS_OPENBSD"
        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -pthread"
        # PORT_FILES=port/openbsd/openbsd_specific.cc
-	FIND=gfind
-	WATCH=gnuwatch
        ;;
    DragonFly)
        PLATFORM=OS_DRAGONFLYBSD
@@ -232,137 +212,117 @@ EOF
        fi
    fi

-    if ! test $ROCKSDB_DISABLE_SNAPPY; then
-        # Test whether Snappy library is installed
-        # http://code.google.com/p/snappy/
-        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <snappy.h>
-          int main() {}
+    # Test whether Snappy library is installed
+    # http://code.google.com/p/snappy/
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <snappy.h>
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DSNAPPY"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lsnappy"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -lsnappy"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DSNAPPY"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lsnappy"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -lsnappy"
    fi

-    if ! test $ROCKSDB_DISABLE_GFLAGS; then
-        # Test whether gflags library is installed
-        # http://gflags.github.io/gflags/
-        # check if the namespace is gflags
-        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
-          #include <gflags/gflags.h>
-          int main() {}
+    # Test whether gflags library is installed
+    # http://gflags.github.io/gflags/
+    # check if the namespace is gflags
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
+      #include <gflags/gflags.h>
+      using namespace gflags;
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=1"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
-        else
-          # check if namespace is google
-          $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
-            #include <gflags/gflags.h>
-            using namespace google;
-            int main() {}
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=gflags"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
+    else
+      # check if namespace is google
+      $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
+        #include <gflags/gflags.h>
+        using namespace google;
+        int main() {}
 EOF
-          if [ "$?" = 0 ]; then
-              COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=google"
-              PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
-          fi
-        fi
+      if [ "$?" = 0 ]; then
+          COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=google"
+          PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
+      fi
    fi

-    if ! test $ROCKSDB_DISABLE_ZLIB; then
-        # Test whether zlib library is installed
-        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <zlib.h>
-          int main() {}
+    # Test whether zlib library is installed
+    $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <zlib.h>
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DZLIB"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lz"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -lz"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DZLIB"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lz"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -lz"
    fi

-    if ! test $ROCKSDB_DISABLE_BZIP; then
-        # Test whether bzip library is installed
-        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <bzlib.h>
-          int main() {}
+    # Test whether bzip library is installed
+    $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <bzlib.h>
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DBZIP2"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lbz2"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -lbz2"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DBZIP2"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lbz2"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -lbz2"
    fi

-    if ! test $ROCKSDB_DISABLE_LZ4; then
-        # Test whether lz4 library is installed
-        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <lz4.h>
-          #include <lz4hc.h>
-          int main() {}
+    # Test whether lz4 library is installed
+    $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <lz4.h>
+      #include <lz4hc.h>
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DLZ4"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -llz4"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -llz4"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DLZ4"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -llz4"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -llz4"
    fi

-    if ! test $ROCKSDB_DISABLE_ZSTD; then
-        # Test whether zstd library is installed
-        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <zstd.h>
-          int main() {}
+    # Test whether zstd library is installed
+    $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <zstd.h>
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DZSTD"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lzstd"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -lzstd"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DZSTD"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lzstd"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -lzstd"
    fi

-    if ! test $ROCKSDB_DISABLE_NUMA; then
-        # Test whether numa is available
-        $CXX $CFLAGS -x c++ - -o /dev/null -lnuma 2>/dev/null  <<EOF
-          #include <numa.h>
-          #include <numaif.h>
-          int main() {}
+    # Test whether numa is available
+    $CXX $CFLAGS -x c++ - -o /dev/null -lnuma 2>/dev/null  <<EOF
+      #include <numa.h>
+      #include <numaif.h>
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DNUMA"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lnuma"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -lnuma"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DNUMA"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lnuma"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -lnuma"
    fi

-    if ! test $ROCKSDB_DISABLE_TBB; then
-        # Test whether tbb is available
-        $CXX $CFLAGS $LDFLAGS -x c++ - -o /dev/null -ltbb 2>/dev/null  <<EOF
-          #include <tbb/tbb.h>
-          int main() {}
+    # Test whether tbb is available
+    $CXX $CFLAGS $LDFLAGS -x c++ - -o /dev/null -ltbb 2>/dev/null  <<EOF
+      #include <tbb/tbb.h>
+      int main() {}
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DTBB"
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ltbb"
-            JAVA_LDFLAGS="$JAVA_LDFLAGS -ltbb"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DTBB"
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ltbb"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -ltbb"
    fi

-    if ! test $ROCKSDB_DISABLE_JEMALLOC; then
-        # Test whether jemalloc is available
-        if echo 'int main() {}' | $CXX $CFLAGS -x c++ - -o /dev/null -ljemalloc \
-          2>/dev/null; then
-            # This will enable some preprocessor identifiers in the Makefile
-            JEMALLOC=1
-            # JEMALLOC can be enabled either using the flag (like here) or by
-            # providing direct link to the jemalloc library
-            WITH_JEMALLOC_FLAG=1
-        fi
-    fi
-    if ! test $JEMALLOC && ! test $ROCKSDB_DISABLE_TCMALLOC; then
+    # Test whether jemalloc is available
+    if echo 'int main() {}' | $CXX $CFLAGS -x c++ - -o /dev/null -ljemalloc \
+      2>/dev/null; then
+        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ljemalloc"
+        JAVA_LDFLAGS="$JAVA_LDFLAGS -ljemalloc"
+        JEMALLOC=1
+    else
        # jemalloc is not available. Let's try tcmalloc
        if echo 'int main() {}' | $CXX $CFLAGS -x c++ - -o /dev/null \
          -ltcmalloc 2>/dev/null; then
@@ -371,100 +331,88 @@ EOF
        fi
    fi

-    if ! test $ROCKSDB_DISABLE_MALLOC_USABLE_SIZE; then
-        # Test whether malloc_usable_size is available
-        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <malloc.h>
-          int main() {
-            size_t res = malloc_usable_size(0);
-            return 0;
-          }
+    # Test whether malloc_usable_size is available
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <malloc.h>
+      int main() {
+        size_t res = malloc_usable_size(0);
+        return 0;
+      }
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_MALLOC_USABLE_SIZE"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_MALLOC_USABLE_SIZE"
    fi

-    if ! test $ROCKSDB_DISABLE_PTHREAD_MUTEX_ADAPTIVE_NP; then
-        # Test whether PTHREAD_MUTEX_ADAPTIVE_NP mutex type is available
-        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <pthread.h>
-          int main() {
-            int x = PTHREAD_MUTEX_ADAPTIVE_NP;
-            return 0;
-          }
+    # Test whether PTHREAD_MUTEX_ADAPTIVE_NP mutex type is available
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <pthread.h>
+      int main() {
+        int x = PTHREAD_MUTEX_ADAPTIVE_NP;
+        return 0;
+      }
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX"
    fi

-    if ! test $ROCKSDB_DISABLE_BACKTRACE; then
-        # Test whether backtrace is available
-        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <execinfo.h>>
+    # Test whether backtrace is available
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <execinfo.h>>
+      int main() {
+        void* frames[1];
+        backtrace_symbols(frames, backtrace(frames, 1));
+        return 0;
+      }
+EOF
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_BACKTRACE"
+    else
+        # Test whether execinfo library is installed
+        $CXX $CFLAGS -lexecinfo -x c++ - -o /dev/null 2>/dev/null  <<EOF
+          #include <execinfo.h>
          int main() {
            void* frames[1];
            backtrace_symbols(frames, backtrace(frames, 1));
-            return 0;
          }
 EOF
        if [ "$?" = 0 ]; then
            COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_BACKTRACE"
-        else
-            # Test whether execinfo library is installed
-            $CXX $CFLAGS -lexecinfo -x c++ - -o /dev/null 2>/dev/null  <<EOF
-              #include <execinfo.h>
-              int main() {
-                void* frames[1];
-                backtrace_symbols(frames, backtrace(frames, 1));
-              }
-EOF
-            if [ "$?" = 0 ]; then
-                COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_BACKTRACE"
-                PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lexecinfo"
-                JAVA_LDFLAGS="$JAVA_LDFLAGS -lexecinfo"
-            fi
+            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lexecinfo"
+            JAVA_LDFLAGS="$JAVA_LDFLAGS -lexecinfo"
        fi
    fi

-    if ! test $ROCKSDB_DISABLE_PG; then
-        # Test if -pg is supported
-        $CXX $CFLAGS -pg -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          int main() {
-            return 0;
-          }
+    # Test if -pg is supported
+    $CXX $CFLAGS -pg -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      int main() {
+        return 0;
+      }
 EOF
-        if [ "$?" = 0 ]; then
-            PROFILING_FLAGS=-pg
-        fi
+    if [ "$?" = 0 ]; then
+        PROFILING_FLAGS=-pg
    fi

-    if ! test $ROCKSDB_DISABLE_SYNC_FILE_RANGE; then
-        # Test whether sync_file_range is supported for compatibility with an old glibc
-        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <fcntl.h>
-          int main() {
-            int fd = open("/dev/null", 0);
-            sync_file_range(fd, 0, 1024, SYNC_FILE_RANGE_WRITE);
-          }
+    # Test whether sync_file_range is supported for compatibility with an old glibc
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <fcntl.h>
+      int main() {
+        int fd = open("/dev/null", 0);
+        sync_file_range(fd, 0, 1024, SYNC_FILE_RANGE_WRITE);
+      }
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_RANGESYNC_PRESENT"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_RANGESYNC_PRESENT"
    fi

-    if ! test $ROCKSDB_DISABLE_SCHED_GETCPU; then
-        # Test whether sched_getcpu is supported
-        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-          #include <sched.h>
-          int main() {
-            int cpuid = sched_getcpu();
-          }
+    # Test whether sched_getcpu is supported
+    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+      #include <sched.h>
+      int main() {
+        int cpuid = sched_getcpu();
+      }
 EOF
-        if [ "$?" = 0 ]; then
-            COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_SCHED_GETCPU_PRESENT"
-        fi
+    if [ "$?" = 0 ]; then
+        COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_SCHED_GETCPU_PRESENT"
    fi
 fi

@@ -496,28 +444,21 @@ if test "$USE_HDFS"; then
  JAVA_LDFLAGS="$JAVA_LDFLAGS $HDFS_LDFLAGS"
 fi

-if test -z "$PORTABLE"; then
+if test "$USE_SSE"; then
+  COMMON_FLAGS="$COMMON_FLAGS -msse4.2"
+elif test -z "$PORTABLE"; then
  if test -n "`echo $TARGET_ARCHITECTURE | grep ^ppc64`"; then
    # Tune for this POWER processor, treating '+' models as base models
    POWER=`LD_SHOW_AUXV=1 /bin/true | grep AT_PLATFORM | grep -E -o power[0-9]+`
    COMMON_FLAGS="$COMMON_FLAGS -mcpu=$POWER -mtune=$POWER "
  elif test -n "`echo $TARGET_ARCHITECTURE | grep ^s390x`"; then
    COMMON_FLAGS="$COMMON_FLAGS -march=z10 "
-  elif test -n "`echo $TARGET_ARCHITECTURE | grep ^arm`"; then
-    # TODO: Handle this with approprite options.
-    COMMON_FLAGS="$COMMON_FLAGS"
-  elif [ "$TARGET_OS" == "IOS" ]; then
-    COMMON_FLAGS="$COMMON_FLAGS"
-  elif [ "$TARGET_OS" != "AIX" ] && [ "$TARGET_OS" != "SunOS" ]; then
+  elif [ "$TARGET_OS" != AIX ] && [ "$TARGET_OS" != SunOS ]; then
    COMMON_FLAGS="$COMMON_FLAGS -march=native "
-  elif test "$USE_SSE"; then
-    COMMON_FLAGS="$COMMON_FLAGS -msse4.2 -mpclmul"
  fi
-elif test "$USE_SSE"; then
-  COMMON_FLAGS="$COMMON_FLAGS -msse4.2 -mpclmul"
 fi

-$CXX $PLATFORM_CXXFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null <<EOF
+$CXX $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null <<EOF
  #include <cstdint>
  #include <nmmintrin.h>
  int main() {
@@ -528,24 +469,6 @@ if [ "$?" = 0 ]; then
  COMMON_FLAGS="$COMMON_FLAGS -DHAVE_SSE42"
 elif test "$USE_SSE"; then
  echo "warning: USE_SSE specified but compiler could not use SSE intrinsics, disabling"
-  exit 1
-fi
-
-$CXX $PLATFORM_CXXFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null <<EOF
-  #include <cstdint>
-  #include <wmmintrin.h>
-  int main() {
-    const auto a = _mm_set_epi64x(0, 0);
-    const auto b = _mm_set_epi64x(0, 0);
-    const auto c = _mm_clmulepi64_si128(a, b, 0x00);
-    auto d = _mm_cvtsi128_si64(c);
-  }
-EOF
-if [ "$?" = 0 ]; then
-  COMMON_FLAGS="$COMMON_FLAGS -DHAVE_PCLMUL"
-elif test "$USE_SSE"; then
-  echo "warning: USE_SSE specified but compiler could not use PCLMUL intrinsics, disabling"
-  exit 1
 fi

 # iOS doesn't support thread-local storage, but this check would erroneously
@@ -596,16 +519,7 @@ echo "ROCKSDB_PATCH=$ROCKSDB_PATCH" >> "$OUTPUT"
 echo "CLANG_SCAN_BUILD=$CLANG_SCAN_BUILD" >> "$OUTPUT"
 echo "CLANG_ANALYZER=$CLANG_ANALYZER" >> "$OUTPUT"
 echo "PROFILING_FLAGS=$PROFILING_FLAGS" >> "$OUTPUT"
-echo "FIND=$FIND" >> "$OUTPUT"
-echo "WATCH=$WATCH" >> "$OUTPUT"
-# This will enable some related identifiers for the preprocessor
 if test -n "$JEMALLOC"; then
  echo "JEMALLOC=1" >> "$OUTPUT"
 fi
-# Indicates that jemalloc should be enabled using -ljemalloc flag
-# The alternative is to porvide a direct link to the library via JEMALLOC_LIB
-# and JEMALLOC_INCLUDE
-if test -n "$WITH_JEMALLOC_FLAG"; then
-  echo "WITH_JEMALLOC_FLAG=$WITH_JEMALLOC_FLAG" >> "$OUTPUT"
-fi
 echo "LUA_PATH=$LUA_PATH" >> "$OUTPUT"
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 #
 # Copyright (c) 2016, Facebook. All rights reserved.
 #
@@ -13,12 +13,10 @@ error=0

 function log {
  DATE=`date +%Y-%m-%d:%H:%M:%S`
-  # shellcheck disable=SC2068
  echo $DATE $@
 }

 function log_err {
-  # shellcheck disable=SC2145
  log "ERROR: $@ Error code: $error."
 }

@@ -69,7 +67,7 @@ function update_repo_status {
 #

 # Path to the determinator from the root of the RocksDB repo.
-CONTRUN_DETERMINATOR=./build_tools/RocksDBCommonHelper.php
+CONTRUN_DETERMINATOR=./arcanist_util/config/RocksDBCommonHelper.php

 # Value of the previous commit.
 PREV_COMMIT=
@@ -1,19 +1,18 @@
-# shellcheck disable=SC2148
-GCC_BASE=/mnt/gvfs/third-party2/gcc/8219ec1bcedf8ad9da05e121e193364de2cc4f61/5.x/centos6-native/c447969
-CLANG_BASE=/mnt/gvfs/third-party2/llvm-fb/64d8d58e3d84f8bde7a029763d4f5baf39d0d5b9/stable/centos6-native/6aaf4de
-LIBGCC_BASE=/mnt/gvfs/third-party2/libgcc/ba9be983c81de7299b59fe71950c664a84dcb5f8/5.x/gcc-5-glibc-2.23/339d858
-GLIBC_BASE=/mnt/gvfs/third-party2/glibc/f20197cf3d4bd50339c9777aaa0b2ccadad9e2cb/2.23/gcc-5-glibc-2.23/ca1d1c0
-SNAPPY_BASE=/mnt/gvfs/third-party2/snappy/6427ce8c7496e4ab06c2da81543b94c0de8be3d0/1.1.3/gcc-5-glibc-2.23/9bc6787
-ZLIB_BASE=/mnt/gvfs/third-party2/zlib/8f1e8b867d26efef93eac2fabbdb2e1d512665d7/1.2.8/gcc-5-glibc-2.23/9bc6787
-BZIP2_BASE=/mnt/gvfs/third-party2/bzip2/70471c0571559fe0af7db6d7e8860b93a7eadfe1/1.0.6/gcc-5-glibc-2.23/9bc6787
-LZ4_BASE=/mnt/gvfs/third-party2/lz4/453c89d6f0e68cdf1c151c769197fabedad9cac8/r131/gcc-5-glibc-2.23/9bc6787
-ZSTD_BASE=/mnt/gvfs/third-party2/zstd/00a40fa5f8bd2cd0622f2e868552793aef37ccf4/1.3.0/gcc-5-glibc-2.23/03859b5
-GFLAGS_BASE=/mnt/gvfs/third-party2/gflags/47eef08f9acb77de982fbda6047c26d330739538/2.2.0/gcc-5-glibc-2.23/9bc6787
-JEMALLOC_BASE=/mnt/gvfs/third-party2/jemalloc/4414ddc78df8008b35cc4adac23590ad29148584/master/gcc-5-glibc-2.23/d506c82
-NUMA_BASE=/mnt/gvfs/third-party2/numa/9d7ae2693d05d62f9a579cb21e6b717cf257a75d/2.0.11/gcc-5-glibc-2.23/9bc6787
-LIBUNWIND_BASE=/mnt/gvfs/third-party2/libunwind/2b2dd58e3a52ccf2c1d827def59e5f740de0ad15/1.2/gcc-5-glibc-2.23/b443de1
-TBB_BASE=/mnt/gvfs/third-party2/tbb/379addf7ab2468a2b4293b47456cfcd1c9cb318d/4.3/gcc-5-glibc-2.23/9bc6787
-KERNEL_HEADERS_BASE=/mnt/gvfs/third-party2/kernel-headers/3f68f5fe65a85b7c2d3e66852268fbd1efdb3151/4.0.9-36_fbk5_2933_gd092e3f/gcc-5-glibc-2.23/da39a3e
-BINUTILS_BASE=/mnt/gvfs/third-party2/binutils/b9fab0aec99d9c36408e810b2677e91c12807afd/2.28/centos6-native/da39a3e
-VALGRIND_BASE=/mnt/gvfs/third-party2/valgrind/423431d61786b20bcc3bde8972901130cb29e6b3/3.11.0/gcc-5-glibc-2.23/9bc6787
-LUA_BASE=/mnt/gvfs/third-party2/lua/3b0bb3bd9a0f690a069c479fcc0f7424fc7456d2/5.2.3/gcc-5-glibc-2.23/65372bd
+GCC_BASE=/mnt/gvfs/third-party2/gcc/2928bb3ed95bf64f5b388ee88c30dc74710c3b35/5.x/centos6-native/f4950a1
+CLANG_BASE=/mnt/gvfs/third-party2/llvm-fb/a5fea028cb7ba43498976e1f8054b0b2e790c295/stable/centos6-native/6aaf4de
+LIBGCC_BASE=/mnt/gvfs/third-party2/libgcc/7a9099f6587ee4378c0b1fa32bb8934019d30ca4/5.x/gcc-5-glibc-2.23/339d858
+GLIBC_BASE=/mnt/gvfs/third-party2/glibc/3b7c6469854dfc7832a1c3cc5b86919a84e5f865/2.23/gcc-5-glibc-2.23/ca1d1c0
+SNAPPY_BASE=/mnt/gvfs/third-party2/snappy/8c38a4c1e52b4c2cc8a9cdc31b9c947ed7dbfcb4/1.1.3/gcc-5-glibc-2.23/9bc6787
+ZLIB_BASE=/mnt/gvfs/third-party2/zlib/d7861abe6f0e27ab98c9303b95a662f0e4cdedb5/1.2.8/gcc-5-glibc-2.23/9bc6787
+BZIP2_BASE=/mnt/gvfs/third-party2/bzip2/740325875f6729f42d28deaa2147b0854f3a347e/1.0.6/gcc-5-glibc-2.23/9bc6787
+LZ4_BASE=/mnt/gvfs/third-party2/lz4/0815d59804160c96caac5f27ca004f51af893dc6/r131/gcc-5-glibc-2.23/9bc6787
+ZSTD_BASE=/mnt/gvfs/third-party2/zstd/c15a4f5f619a2930478d01e2e34dc1e0652b0873/1.1.4/gcc-5-glibc-2.23/03859b5
+GFLAGS_BASE=/mnt/gvfs/third-party2/gflags/f905a5e1032fb30c05db3d3752319857388c0c49/2.2.0/gcc-5-glibc-2.23/9bc6787
+JEMALLOC_BASE=/mnt/gvfs/third-party2/jemalloc/8d60633d822a2a55849c73db24e74a25e52b71db/master/gcc-5-glibc-2.23/1c32b4b
+NUMA_BASE=/mnt/gvfs/third-party2/numa/17c514c4d102a25ca15f4558be564eeed76f4b6a/2.0.8/gcc-5-glibc-2.23/9bc6787
+LIBUNWIND_BASE=/mnt/gvfs/third-party2/libunwind/8db74270cd6d0212ac92d69e7fc7beefe617d772/trunk/gcc-5-glibc-2.23/b1847cb
+TBB_BASE=/mnt/gvfs/third-party2/tbb/9d9a554877d0c5bef330fe818ab7178806dd316a/4.0_update2/gcc-5-glibc-2.23/9bc6787
+KERNEL_HEADERS_BASE=/mnt/gvfs/third-party2/kernel-headers/90c9734afc5579c9d1db529fa788d09f97763b85/4.0.9-36_fbk5_2933_gd092e3f/gcc-5-glibc-2.23/da39a3e
+BINUTILS_BASE=/mnt/gvfs/third-party2/binutils/9e829389ef61b92c62de8748c80169aaf25ce1f0/2.26.1/centos6-native/da39a3e
+VALGRIND_BASE=/mnt/gvfs/third-party2/valgrind/d7f4d4d86674a57668e3a96f76f0e17dd0eb8765/3.11.0/gcc-5-glibc-2.23/9bc6787
+LUA_BASE=/mnt/gvfs/third-party2/lua/61e4abf5813bbc39bc4f548757ccfcadde175a48/5.2.3/gcc-5-glibc-2.23/65372bd
@@ -1,4 +1,3 @@
-# shellcheck disable=SC2148
 GCC_BASE=/mnt/gvfs/third-party2/gcc/cf7d14c625ce30bae1a4661c2319c5a283e4dd22/4.8.1/centos6-native/cc6c9dc
 CLANG_BASE=/mnt/gvfs/third-party2/llvm-fb/8598c375b0e94e1448182eb3df034704144a838d/stable/centos6-native/3f16ddd
 LIBGCC_BASE=/mnt/gvfs/third-party2/libgcc/d6e0a7da6faba45f5e5b1638f9edd7afc2f34e7d/4.8.1/gcc-4.8.1-glibc-2.17/8aac7fc
@@ -0,0 +1,18 @@
+GCC_BASE=/mnt/gvfs/third-party2/gcc/6e8e715624fd15256a7970073387793dfcf79b46/7.x/centos7-native/b2ef2b6
+CLANG_BASE=/mnt/gvfs/third-party2/llvm-fb/ef37e1faa1c29782abfac1ae65a291b9b7966f6d/stable/centos7-native/c9f9104
+LIBGCC_BASE=/mnt/gvfs/third-party2/libgcc/c67031f0f739ac61575a061518d6ef5038f99f90/7.x/platform007/5620abc
+GLIBC_BASE=/mnt/gvfs/third-party2/glibc/60d6f124a78798b73944f5ba87c2306ae3460153/2.26/platform007/f259413
+SNAPPY_BASE=/mnt/gvfs/third-party2/snappy/7f9bdaada18f59bc27ec2b0871eb8a6144343aef/1.1.3/platform007/ca4da3d
+ZLIB_BASE=/mnt/gvfs/third-party2/zlib/22c2d65676fb7c23cfa797c4f6937f38b026f3cf/1.2.8/platform007/ca4da3d
+BZIP2_BASE=/mnt/gvfs/third-party2/bzip2/dc49a21c5fceec6456a7a28a94dcd16690af1337/1.0.6/platform007/ca4da3d
+LZ4_BASE=/mnt/gvfs/third-party2/lz4/907b498203d297947f3bb70b9466f47e100f1873/r131/platform007/ca4da3d
+ZSTD_BASE=/mnt/gvfs/third-party2/zstd/3ee276cbacfad3074e3f07bf826ac47f06970f4e/1.3.5/platform007/15a3614
+GFLAGS_BASE=/mnt/gvfs/third-party2/gflags/0b9929d2588991c65a57168bf88aff2db87c5d48/2.2.0/platform007/ca4da3d
+JEMALLOC_BASE=/mnt/gvfs/third-party2/jemalloc/9c910d36d6235cc40e8ff559358f1833452300ca/master/platform007/5b0f53e
+NUMA_BASE=/mnt/gvfs/third-party2/numa/9cbf2460284c669ed19c3ccb200a71f7dd7e53c7/2.0.11/platform007/ca4da3d
+LIBUNWIND_BASE=/mnt/gvfs/third-party2/libunwind/bf3d7497fe4e6d007354f0adffa16ce3003f8338/1.3/platform007/6f3e0a9
+TBB_BASE=/mnt/gvfs/third-party2/tbb/ff4e0b093534704d8abab678a4fd7f5ea7b094c7/2018_U5/platform007/ca4da3d
+KERNEL_HEADERS_BASE=/mnt/gvfs/third-party2/kernel-headers/b5c4a61a5c483ba24722005ae07895971a2ac707/fb/platform007/da39a3e
+BINUTILS_BASE=/mnt/gvfs/third-party2/binutils/92ff90349e2f43ea0a8246d8b1cf17b6869013e3/2.29.1/centos7-native/da39a3e
+VALGRIND_BASE=/mnt/gvfs/third-party2/valgrind/f3f697a28122e6bcd513273dd9c1ff23852fc59f/3.13.0/platform007/ca4da3d
+LUA_BASE=/mnt/gvfs/third-party2/lua/f0cd714433206d5139df61659eb7b28b1dea6683/5.3.4/platform007/5007832
@@ -1,2 +1,2 @@
-#!/usr/bin/env bash
+#!/bin/bash
 docker run -v $PWD:/rocks -w /rocks buildpack-deps make
@@ -83,7 +83,6 @@ CFLAGS+=" -DTBB"

 # use Intel SSE support for checksum calculations
 export USE_SSE=1
-export PORTABLE=1

 BINUTILS="$BINUTILS_BASE/bin"
 AR="$BINUTILS/ar"
@@ -54,7 +54,6 @@ TBB_LIBS="$TBB_BASE/lib/libtbb.a"

 # use Intel SSE support for checksum calculations
 export USE_SSE=1
-export PORTABLE=1

 BINUTILS="$BINUTILS_BASE/bin"
 AR="$BINUTILS/ar"
@@ -0,0 +1,157 @@
+#!/bin/sh
+#
+# Set environment variables so that we can compile rocksdb using
+# fbcode settings.  It uses the latest g++ and clang compilers and also
+# uses jemalloc
+# Environment variables that change the behavior of this script:
+# PIC_BUILD -- if true, it will only take pic versions of libraries from fbcode. libraries that don't have pic variant will not be included
+
+
+BASEDIR=`dirname $BASH_SOURCE`
+source "$BASEDIR/dependencies_platform007.sh"
+
+CFLAGS=""
+
+# libgcc
+LIBGCC_INCLUDE="$LIBGCC_BASE/include/c++/7.3.0"
+LIBGCC_LIBS=" -L $LIBGCC_BASE/lib"
+
+# glibc
+GLIBC_INCLUDE="$GLIBC_BASE/include"
+GLIBC_LIBS=" -L $GLIBC_BASE/lib"
+
+# snappy
+SNAPPY_INCLUDE=" -I $SNAPPY_BASE/include/"
+if test -z $PIC_BUILD; then
+  SNAPPY_LIBS=" $SNAPPY_BASE/lib/libsnappy.a"
+else
+  SNAPPY_LIBS=" $SNAPPY_BASE/lib/libsnappy_pic.a"
+fi
+CFLAGS+=" -DSNAPPY"
+
+if test -z $PIC_BUILD; then
+  # location of zlib headers and libraries
+  ZLIB_INCLUDE=" -I $ZLIB_BASE/include/"
+  ZLIB_LIBS=" $ZLIB_BASE/lib/libz.a"
+  CFLAGS+=" -DZLIB"
+
+  # location of bzip headers and libraries
+  BZIP_INCLUDE=" -I $BZIP2_BASE/include/"
+  BZIP_LIBS=" $BZIP2_BASE/lib/libbz2.a"
+  CFLAGS+=" -DBZIP2"
+
+  LZ4_INCLUDE=" -I $LZ4_BASE/include/"
+  LZ4_LIBS=" $LZ4_BASE/lib/liblz4.a"
+  CFLAGS+=" -DLZ4"
+fi
+
+ZSTD_INCLUDE=" -I $ZSTD_BASE/include/"
+if test -z $PIC_BUILD; then
+  ZSTD_LIBS=" $ZSTD_BASE/lib/libzstd.a"
+else
+  ZSTD_LIBS=" $ZSTD_BASE/lib/libzstd_pic.a"
+fi
+CFLAGS+=" -DZSTD"
+
+# location of gflags headers and libraries
+GFLAGS_INCLUDE=" -I $GFLAGS_BASE/include/"
+if test -z $PIC_BUILD; then
+  GFLAGS_LIBS=" $GFLAGS_BASE/lib/libgflags.a"
+else
+  GFLAGS_LIBS=" $GFLAGS_BASE/lib/libgflags_pic.a"
+fi
+CFLAGS+=" -DGFLAGS=gflags"
+
+# location of jemalloc
+JEMALLOC_INCLUDE=" -I $JEMALLOC_BASE/include/"
+JEMALLOC_LIB=" $JEMALLOC_BASE/lib/libjemalloc.a"
+
+if test -z $PIC_BUILD; then
+  # location of numa
+  NUMA_INCLUDE=" -I $NUMA_BASE/include/"
+  NUMA_LIB=" $NUMA_BASE/lib/libnuma.a"
+  CFLAGS+=" -DNUMA"
+
+  # location of libunwind
+  LIBUNWIND="$LIBUNWIND_BASE/lib/libunwind.a"
+fi
+
+# location of TBB
+TBB_INCLUDE=" -isystem $TBB_BASE/include/"
+if test -z $PIC_BUILD; then
+  TBB_LIBS="$TBB_BASE/lib/libtbb.a"
+else
+  TBB_LIBS="$TBB_BASE/lib/libtbb_pic.a"
+fi
+CFLAGS+=" -DTBB"
+
+# use Intel SSE support for checksum calculations
+export USE_SSE=1
+export PORTABLE=1
+
+BINUTILS="$BINUTILS_BASE/bin"
+AR="$BINUTILS/ar"
+
+DEPS_INCLUDE="$SNAPPY_INCLUDE $ZLIB_INCLUDE $BZIP_INCLUDE $LZ4_INCLUDE $ZSTD_INCLUDE $GFLAGS_INCLUDE $NUMA_INCLUDE $TBB_INCLUDE"
+
+STDLIBS="-L $GCC_BASE/lib64"
+
+CLANG_BIN="$CLANG_BASE/bin"
+CLANG_LIB="$CLANG_BASE/lib"
+CLANG_SRC="$CLANG_BASE/../../src"
+
+CLANG_ANALYZER="$CLANG_BIN/clang++"
+CLANG_SCAN_BUILD="$CLANG_SRC/llvm/tools/clang/tools/scan-build/bin/scan-build"
+
+if [ -z "$USE_CLANG" ]; then
+  # gcc
+  CC="$GCC_BASE/bin/gcc"
+  CXX="$GCC_BASE/bin/g++"
+
+  CFLAGS+=" -B$BINUTILS/gold"
+  CFLAGS+=" -isystem $LIBGCC_INCLUDE"
+  CFLAGS+=" -isystem $GLIBC_INCLUDE"
+  JEMALLOC=1
+else
+  # clang
+  CLANG_INCLUDE="$CLANG_LIB/clang/stable/include"
+  CC="$CLANG_BIN/clang"
+  CXX="$CLANG_BIN/clang++"
+
+  KERNEL_HEADERS_INCLUDE="$KERNEL_HEADERS_BASE/include"
+
+  CFLAGS+=" -B$BINUTILS/gold -nostdinc -nostdlib"
+  CFLAGS+=" -isystem $LIBGCC_BASE/include/c++/7.x "
+  CFLAGS+=" -isystem $LIBGCC_BASE/include/c++/7.x/x86_64-facebook-linux "
+  CFLAGS+=" -isystem $GLIBC_INCLUDE"
+  CFLAGS+=" -isystem $LIBGCC_INCLUDE"
+  CFLAGS+=" -isystem $CLANG_INCLUDE"
+  CFLAGS+=" -isystem $KERNEL_HEADERS_INCLUDE/linux "
+  CFLAGS+=" -isystem $KERNEL_HEADERS_INCLUDE "
+  CFLAGS+=" -Wno-expansion-to-defined "
+  CXXFLAGS="-nostdinc++"
+fi
+
+CFLAGS+=" $DEPS_INCLUDE"
+CFLAGS+=" -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX -DROCKSDB_FALLOCATE_PRESENT -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_SUPPORT_THREAD_LOCAL -DHAVE_SSE42"
+CXXFLAGS+=" $CFLAGS"
+
+EXEC_LDFLAGS=" $SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $ZSTD_LIBS $GFLAGS_LIBS $NUMA_LIB $TBB_LIBS"
+EXEC_LDFLAGS+=" -B$BINUTILS/gold"
+EXEC_LDFLAGS+=" -Wl,--dynamic-linker,/usr/local/fbcode/platform007/lib/ld.so"
+EXEC_LDFLAGS+=" $LIBUNWIND"
+EXEC_LDFLAGS+=" -Wl,-rpath=/usr/local/fbcode/platform007/lib"
+# required by libtbb
+EXEC_LDFLAGS+=" -ldl"
+
+PLATFORM_LDFLAGS="$LIBGCC_LIBS $GLIBC_LIBS $STDLIBS -lgcc -lstdc++"
+
+EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $ZSTD_LIBS $GFLAGS_LIBS $TBB_LIBS"
+
+VALGRIND_VER="$VALGRIND_BASE/bin/"
+
+# lua not supported because it's on track for deprecation, I think
+LUA_PATH=
+LUA_LIB=
+
+export CC CXX AR CFLAGS CXXFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED VALGRIND_VER JEMALLOC_LIB JEMALLOC_INCLUDE CLANG_ANALYZER CLANG_SCAN_BUILD LUA_PATH LUA_LIB
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 # If clang_format_diff.py command is not specfied, we assume we are able to
 # access directly without any path.
 if [ -z $CLANG_FORMAT_DIFF ]
@@ -1,4 +1,3 @@
-# shellcheck disable=SC1113
 #/usr/bin/env bash

 set -e
@@ -29,14 +28,12 @@ function package() {
    if dpkg --get-selections | grep --quiet $1; then
      log "$1 is already installed. skipping."
    else
-      # shellcheck disable=SC2068
      apt-get install $@ -y
    fi
  elif [[ $OS = "centos" ]]; then
    if rpm -qa | grep --quiet $1; then
      log "$1 is already installed. skipping."
    else
-      # shellcheck disable=SC2068
      yum install $@ -y
    fi
  fi
@@ -55,7 +52,6 @@ function gem_install() {
  if gem list | grep --quiet $1; then
    log "$1 is already installed. skipping."
  else
-    # shellcheck disable=SC2068
    gem install $@
  fi
 }
@@ -129,5 +125,4 @@ function main() {
    include $LIB_DIR
 }

-# shellcheck disable=SC2068
 main $@
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash

 set -e

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 # This script is executed by Sandcastle
 # to determine next steps to run

@@ -85,8 +85,9 @@ NON_SHM="TMPD=/tmp/rocksdb_test_tmp"
 GCC_481="ROCKSDB_FBCODE_BUILD_WITH_481=1"
 ASAN="COMPILE_WITH_ASAN=1"
 CLANG="USE_CLANG=1"
-LITE="OPT=\"-DROCKSDB_LITE -g\""
-TSAN="COMPILE_WITH_TSAN=1"
+# in gcc-5 there are known problems with TSAN like https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71090.
+# using platform007 gives us gcc-8 or higher which has that bug fixed.
+TSAN="ROCKSDB_FBCODE_BUILD_WITH_PLATFORM007=1 COMPILE_WITH_TSAN=1"
 UBSAN="COMPILE_WITH_UBSAN=1"
 DISABLE_JEMALLOC="DISABLE_JEMALLOC=1"
 HTTP_PROXY="https_proxy=http://fwdproxy.29.prn1:8080 http_proxy=http://fwdproxy.29.prn1:8080 ftp_proxy=http://fwdproxy.29.prn1:8080"
@@ -130,6 +131,35 @@ DISABLE_COMMANDS="[
    }
 ]"

+#
+# RocksDB unit test in parallel
+# Currently we always have noise in our parallel runs. This job is to help
+# manage the noise
+#
+PARALLEL_UNIT_TEST_COMMANDS="[
+    {
+        'name':'Rocksdb Parallel Unit Test',
+        'oncall':'$ONCALL',
+        'steps': [
+            $CLEANUP_ENV,
+            {
+                'name':'Build and test RocksDB debug version',
+                'shell':'$DEBUG make -j$(nproc) all && $SHM make check > /dev/null 2>&1 || $CONTRUN_NAME=punit_check $TASK_CREATION_TOOL || cat t/log-*',
+                'user':'root',
+                $PARSER
+            },
+            $CLEANUP_ENV,
+            {
+                'name':'Build and test RocksDB debug version under gcc-4.8.1',
+                'shell':'$GCC_481 $DEBUG make -j$(nproc) all && $SHM make check > /dev/null 2>&1 || $CONTRUN_NAME=punit_check_gcc481 $TASK_CREATION_TOOL || cat t/log-*',
+                'user':'root',
+                $PARSER
+            },
+        ],
+        $REPORT
+    }
+]"
+
 #
 # RocksDB unit test
 #
@@ -343,7 +373,7 @@ LITE_BUILD_COMMANDS="[
            $CLEANUP_ENV,
            {
                'name':'Build RocksDB debug version',
-                'shell':'$LITE make J=1 all check || $CONTRUN_NAME=lite $TASK_CREATION_TOOL',
+                'shell':'$LITE make J=1 static_lib || $CONTRUN_NAME=lite_static_lib $TASK_CREATION_TOOL',
                'user':'root',
                $PARSER
            },
@@ -353,19 +383,23 @@ LITE_BUILD_COMMANDS="[
 ]"

 #
-# Report RocksDB lite binary size to scuba
-REPORT_LITE_BINARY_SIZE_COMMANDS="[
+# RocksDB lite tests
+#
+LITE_UNIT_TEST_COMMANDS="[
    {
-        'name':'Rocksdb Lite Binary Size',
+        'name':'Rocksdb Lite Unit Test',
        'oncall':'$ONCALL',
        'steps': [
            $CLEANUP_ENV,
            {
-                'name':'Report RocksDB Lite binary size to scuba',
-                'shell':'tools/report_lite_binary_size.sh',
+                'name':'Build RocksDB debug version',
+                'shell':'$SHM $LITE make J=1 check || $CONTRUN_NAME=lite_check $TASK_CREATION_TOOL',
                'user':'root',
+                $PARSER
            },
        ],
+        $REPORT
+    }
 ]"

 #
@@ -560,7 +594,7 @@ TSAN_CRASH_TEST_COMMANDS="[
            {
                'name':'Compile and run',
                'timeout': 86400,
-                'shell':'set -o pipefail && $SHM $DEBUG $TSAN CRASH_TEST_KILL_ODD=1887 CRASH_TEST_EXT_ARGS=--log2_keys_per_lock=22  make J=1 crash_test || $CONTRUN_NAME=tsan_crash_test $TASK_CREATION_TOOL',
+                'shell':'set -o pipefail && $SHM $DEBUG $TSAN CRASH_TEST_KILL_ODD=1887 make J=1 crash_test || $CONTRUN_NAME=tsan_crash_test $TASK_CREATION_TOOL',
                'user':'root',
                $PARSER
            },
@@ -579,7 +613,39 @@ run_format_compatible()
  rm -rf /dev/shm/rocksdb
  mkdir /dev/shm/rocksdb

-  tools/check_format_compatible.sh
+  echo '
+  if [ -e "build_tools/build_detect_platform" ]
+  then
+    sed "s/tcmalloc/nothingnothingnothing/g" build_tools/build_detect_platform > $TEST_TMPDIR/temp_build_file
+    rm -rf build_tools/build_detect_platform
+    cp $TEST_TMPDIR/temp_build_file build_tools/build_detect_platform
+    chmod +x build_tools/build_detect_platform
+  fi
+
+  if [ -e "build_detect_platform" ]
+  then
+    sed "s/tcmalloc/nothingnothingnothing/g" build_detect_platform > $TEST_TMPDIR/temp_build_file
+    rm -rf build_detect_platform
+    cp $TEST_TMPDIR/temp_build_file build_detect_platform
+    chmod +x build_detect_platform
+  fi
+
+  make ldb -j32
+
+  if [ -e "build_detect_platform" ]
+  then
+    git checkout -- build_detect_platform
+  fi
+
+  if [ -e "build_tools/build_detect_platform" ]
+  then
+    git checkout -- build_tools/build_detect_platform
+  fi
+  ' > temp_build_ldb.sh
+
+  sed "s/make ldb -j32/source temp_build_ldb.sh/g" tools/check_format_compatible.sh > tools/temp_check_format_compatible.sh
+  chmod +x tools/temp_check_format_compatible.sh
+  tools/temp_check_format_compatible.sh
 }

 FORMAT_COMPATIBLE_COMMANDS="[
@@ -711,6 +777,9 @@ JAVA_BUILD_TEST_COMMANDS="[


 case $1 in
+  punit)
+    echo $PARALLEL_UNIT_TEST_COMMANDS
+    ;;
  unit)
    echo $UNIT_TEST_COMMANDS
    ;;
@@ -744,8 +813,8 @@ case $1 in
  lite)
    echo $LITE_BUILD_COMMANDS
    ;;
-  report_lite_binary_size)
-    echo $REPORT_LITE_BINARY_SIZE_COMMANDS
+  lite_test)
+    echo $LITE_UNIT_TEST_COMMANDS
    ;;
  stress_crash)
    echo $STRESS_CRASH_TEST_COMMANDS
@@ -1,16 +1,13 @@
 # This script enables you running RocksDB tests by running
 # All the tests concurrently and utilizing all the cores
 Param(
-  [switch]$EnableJE = $false,  # Look for and use test executable, append _je to listed exclusions
+  [switch]$EnableJE = $false,  # Look for and use _je executable, append _je to listed exclusions
  [switch]$RunAll = $false,    # Will attempt discover all *_test[_je].exe binaries and run all
                               # of them as Google suites. I.e. It will run test cases concurrently
                               # except those mentioned as $Run, those will run as individual test cases
                               # And any execlued with $ExcludeExes or $ExcludeCases
                               # It will also not run any individual test cases
                               # excluded but $ExcludeCasese
-  [switch]$RunAllExe = $false, # Look for and use test exdcutables, append _je to exclusions automatically
-                               # It will attempt to run them in parallel w/o breaking them up on individual
-                               # test cases. Those listed with $ExcludeExes will be excluded
  [string]$SuiteRun = "",      # Split test suites in test cases and run in parallel, not compatible with $RunAll
  [string]$Run = "",           # Run specified executables in parallel but do not split to test cases
  [string]$ExcludeCases = "",  # Exclude test cases, expects a comma separated list, no spaces
@@ -42,18 +39,13 @@ $RunOnly.Add("compact_on_deletion_collector_test") | Out-Null
 $RunOnly.Add("merge_test") | Out-Null
 $RunOnly.Add("stringappend_test") | Out-Null # Apparently incorrectly written
 $RunOnly.Add("backupable_db_test") | Out-Null # Disabled
-$RunOnly.Add("timer_queue_test") | Out-Null # Not a gtest
+

 if($RunAll -and $SuiteRun -ne "") {
    Write-Error "$RunAll and $SuiteRun are not compatible"
    exit 1
 }

-if($RunAllExe -and $Run -ne "") {
-    Write-Error "$RunAllExe and $Run are not compatible"
-    exit 1
-}
-
 # If running under Appveyor assume that root
 [string]$Appveyor = $Env:APPVEYOR_BUILD_FOLDER
 if($Appveyor -ne "") {
@@ -139,8 +131,12 @@ function ExtractTestCases([string]$GTestExe, $HashTable) {

      # Leading whitespace is fine
      $l = $l -replace '^\s+',''
+      # but no whitespace any other place
+      if($l -match "\s+") {
+        continue
+      }
      # Trailing dot is a test group but no whitespace
-      if ($l -match "\.$" -and $l -notmatch "\s+") {
+      elseif ( $l -match "\.$" ) {
        $Group = $l
      }  else {
        # Otherwise it is a test name, remove leading space
@@ -227,11 +223,13 @@ $TestExes = [ordered]@{}
 if($Run -ne "") {

  $test_list = $Run -split ' '
+
  ForEach($t in $test_list) {

    if($EnableJE) {
      $t += "_je"
    }
+
    MakeAndAdd -token $t -HashTable $TestExes
  }

@@ -239,38 +237,6 @@ if($Run -ne "") {
     Write-Error "Failed to extract tests from $Run"
     exit 1
  }
-} elseif($RunAllExe) {
-  # Discover all the test binaries
-  if($EnableJE) {
-    $pattern = "*_test_je.exe"
-  } else {
-    $pattern = "*_test.exe"
-  }
-
-  $search_path = -join ($BinariesFolder, $pattern)
-  Write-Host "Binaries Search Path: $search_path"
-
-  $DiscoveredExe = @()
-  dir -Path $search_path | ForEach-Object {
-     $DiscoveredExe += ($_.Name)     
-  }
-
-  # Remove exclusions
-  ForEach($e in $DiscoveredExe) {
-    $e = $e -replace '.exe$', ''
-    $bare_name = $e -replace '_je$', ''
-
-    if($ExcludeExesSet.Contains($bare_name)) {
-      Write-Warning "Test $e is excluded"
-      continue
-    }
-    MakeAndAdd -token $e -HashTable $TestExes
-  }
-
-  if($TestExes.Count -lt 1) {
-     Write-Error "Failed to discover test executables"
-     exit 1
-  }
 }

 # Ordered by exe @{ Exe = @{ TestCase = LogName }}
@@ -279,7 +245,9 @@ $CasesToRun = [ordered]@{}
 if($SuiteRun -ne "") {
  $suite_list = $SuiteRun -split ' '
  ProcessSuites -ListOfSuites $suite_list -HashOfHashes $CasesToRun
-} elseif ($RunAll) {
+}
+
+if($RunAll) {
 # Discover all the test binaries
  if($EnableJE) {
    $pattern = "*_test_je.exe"
@@ -287,6 +255,7 @@ if($SuiteRun -ne "") {
    $pattern = "*_test.exe"
  }

+
  $search_path = -join ($BinariesFolder, $pattern)
  Write-Host "Binaries Search Path: $search_path"

@@ -318,6 +287,8 @@ if($SuiteRun -ne "") {
 }


+Write-Host "Attempting to start: $NumTestsToStart tests"
+
 # Invoke a test with a filter and redirect all output
 $InvokeTestCase = {
    param($exe, $test, $log);
@@ -336,7 +307,7 @@ $InvokeTestAsync = {
 # Test limiting factor here
 [int]$count = 0
 # Overall status
-[bool]$script:success = $true;
+[bool]$success = $true;

 function RunJobs($Suites, $TestCmds, [int]$ConcurrencyVal)
 {
@@ -394,7 +365,6 @@ function RunJobs($Suites, $TestCmds, [int]$ConcurrencyVal)
                 break
               }

-              Write-Host "Starting $exe_name"
              [string]$Exe =  -Join ($BinariesFolder, $exe_name)
              $job = Start-Job -Name $exe_name -ScriptBlock $InvokeTestAsync -ArgumentList @($Exe,$log_path)
              $JobToLog.Add($job, $log_path)
@@ -425,7 +395,7 @@ function RunJobs($Suites, $TestCmds, [int]$ConcurrencyVal)
        $log_content = @(Get-Content $log)

        if($completed.State -ne "Completed") {
-            $script:success = $false
+            $success = $false
            Write-Warning $message
            $log_content | Write-Warning
        } else {
@@ -449,7 +419,7 @@ function RunJobs($Suites, $TestCmds, [int]$ConcurrencyVal)
            }

            if(!$pass_found) {
-                $script:success = $false;
+                $success = $false;
                Write-Warning $message
                $log_content | Write-Warning
            } else {
@@ -473,7 +443,7 @@ New-TimeSpan -Start $StartDate -End $EndDate |
  }


-if(!$script:success) {
+if(!$success) {
 # This does not succeed killing off jobs quick
 # So we simply exit
 #    Remove-Job -Job $jobs -Force
@@ -1,43 +0,0 @@
-#!/bin/bash
-set -e
-
-ROCKSDB_VERSION="5.10.3"
-ZSTD_VERSION="1.1.3"
-
-echo "This script configures CentOS with everything needed to build and run RocksDB"
-
-yum update -y && yum install epel-release -y
-
-yum install -y \
-  wget \
-  gcc-c++ \
-  snappy snappy-devel \
-  zlib zlib-devel \
-  bzip2 bzip2-devel \
-  lz4-devel \
-  libasan \
-  gflags
-
-mkdir -pv /usr/local/rocksdb-${ROCKSDB_VERSION}
-ln -sfT /usr/local/rocksdb-${ROCKSDB_VERSION} /usr/local/rocksdb
-
-wget -qO /tmp/zstd-${ZSTD_VERSION}.tar.gz https://github.com/facebook/zstd/archive/v${ZSTD_VERSION}.tar.gz
-wget -qO /tmp/rocksdb-${ROCKSDB_VERSION}.tar.gz https://github.com/facebook/rocksdb/archive/v${ROCKSDB_VERSION}.tar.gz
-
-cd /tmp
-
-tar xzvf zstd-${ZSTD_VERSION}.tar.gz
-tar xzvf rocksdb-${ROCKSDB_VERSION}.tar.gz -C /usr/local/
-
-echo "Installing ZSTD..."
-pushd zstd-${ZSTD_VERSION}
-make && make install
-popd
-
-echo "Compiling RocksDB..."
-cd /usr/local/rocksdb
-chown -R vagrant:vagrant /usr/local/rocksdb/
-sudo -u vagrant make static_lib
-cd examples/
-sudo -u vagrant make all
-sudo -u vagrant ./c_simple_example
@@ -38,7 +38,6 @@ function get_lib_base()
    # platform is not provided, use latest gcc
    result=`ls -dr1v $result/gcc-*[^fb]/ | head -n1`
  else
-    echo $lib_platform
    result="$result/$lib_platform/"
  fi
  
@@ -53,6 +52,45 @@ function get_lib_base()
  log_variable $__res_var
 }

+###########################################################
+#                platform007 dependencies                 #
+###########################################################
+
+OUTPUT="$BASEDIR/dependencies_platform007.sh"
+
+rm -f "$OUTPUT"
+touch "$OUTPUT"
+
+echo "Writing dependencies to $OUTPUT"
+
+# Compilers locations
+GCC_BASE=`readlink -f $TP2_LATEST/gcc/7.x/centos7-native/*/`
+CLANG_BASE=`readlink -f $TP2_LATEST/llvm-fb/stable/centos7-native/*/`
+
+log_variable GCC_BASE
+log_variable CLANG_BASE
+
+# Libraries locations
+get_lib_base libgcc     7.x     platform007
+get_lib_base glibc      2.26    platform007
+get_lib_base snappy     LATEST  platform007
+get_lib_base zlib       LATEST  platform007
+get_lib_base bzip2      LATEST  platform007
+get_lib_base lz4        LATEST  platform007
+get_lib_base zstd       LATEST  platform007
+get_lib_base gflags     LATEST  platform007
+get_lib_base jemalloc   LATEST  platform007
+get_lib_base numa       LATEST  platform007
+get_lib_base libunwind  LATEST  platform007
+get_lib_base tbb        LATEST  platform007
+
+get_lib_base kernel-headers fb platform007
+get_lib_base binutils   LATEST centos7-native
+get_lib_base valgrind   LATEST platform007
+get_lib_base lua        5.3.4  platform007
+
+git diff $OUTPUT
+
 ###########################################################
 #                   5.x dependencies                      #
 ###########################################################
@@ -72,22 +110,22 @@ log_variable GCC_BASE
 log_variable CLANG_BASE

 # Libraries locations
-get_lib_base libgcc     5.x     gcc-5-glibc-2.23
-get_lib_base glibc      2.23    gcc-5-glibc-2.23
-get_lib_base snappy     LATEST  gcc-5-glibc-2.23
-get_lib_base zlib       LATEST  gcc-5-glibc-2.23
-get_lib_base bzip2      LATEST  gcc-5-glibc-2.23
-get_lib_base lz4        LATEST  gcc-5-glibc-2.23
-get_lib_base zstd       LATEST  gcc-5-glibc-2.23
-get_lib_base gflags     LATEST  gcc-5-glibc-2.23
-get_lib_base jemalloc   LATEST  gcc-5-glibc-2.23
-get_lib_base numa       LATEST  gcc-5-glibc-2.23
-get_lib_base libunwind  LATEST  gcc-5-glibc-2.23
-get_lib_base tbb        LATEST  gcc-5-glibc-2.23
+get_lib_base libgcc     5.x
+get_lib_base glibc      2.23
+get_lib_base snappy     LATEST gcc-5-glibc-2.23
+get_lib_base zlib       LATEST
+get_lib_base bzip2      LATEST
+get_lib_base lz4        LATEST
+get_lib_base zstd       LATEST
+get_lib_base gflags     LATEST
+get_lib_base jemalloc   LATEST
+get_lib_base numa       LATEST
+get_lib_base libunwind  LATEST
+get_lib_base tbb        4.0_update2 gcc-5-glibc-2.23

-get_lib_base kernel-headers 4.0.9-36_fbk5_2933_gd092e3f gcc-5-glibc-2.23
+get_lib_base kernel-headers LATEST 
 get_lib_base binutils   LATEST centos6-native 
-get_lib_base valgrind   LATEST gcc-5-glibc-2.23
+get_lib_base valgrind   3.10.0 gcc-5-glibc-2.23
 get_lib_base lua        5.2.3 gcc-5-glibc-2.23

 git diff $OUTPUT
@@ -1,4 +1,4 @@
-#/usr/bin/env bash
+#!/bin/sh
 if [ "$#" = "0" ]; then
  echo "Usage: $0 major|minor|patch|full"
  exit 1
@@ -17,16 +17,16 @@ int main() {
 #include <inttypes.h>
 #include <sys/types.h>
 #include <stdio.h>
+#include <gflags/gflags.h>

-#include "port/port.h"
-#include "rocksdb/cache.h"
 #include "rocksdb/db.h"
+#include "rocksdb/cache.h"
 #include "rocksdb/env.h"
-#include "util/gflags_compat.h"
+#include "port/port.h"
 #include "util/mutexlock.h"
 #include "util/random.h"

-using GFLAGS_NAMESPACE::ParseCommandLineFlags;
+using GFLAGS::ParseCommandLineFlags;

 static const uint32_t KB = 1024;

@@ -40,9 +40,9 @@ static int DecodeValue(void* v) {
 const std::string kLRU = "lru";
 const std::string kClock = "clock";

-void dumbDeleter(const Slice& /*key*/, void* /*value*/) {}
+void dumbDeleter(const Slice& key, void* value) {}

-void eraseDeleter(const Slice& /*key*/, void* value) {
+void eraseDeleter(const Slice& key, void* value) {
  Cache* cache = reinterpret_cast<Cache*>(value);
  cache->Erase("foo");
 }
@@ -470,7 +470,7 @@ class Value {
 };

 namespace {
-void deleter(const Slice& /*key*/, void* value) {
+void deleter(const Slice& key, void* value) {
  delete static_cast<Value *>(value);
 }
 }  // namespace
@@ -27,11 +27,6 @@ std::shared_ptr<Cache> NewClockCache(size_t capacity, int num_shard_bits,
 #include <atomic>
 #include <deque>

-// "tbb/concurrent_hash_map.h" requires RTTI if exception is enabled.
-// Disable it so users can chooose to disable RTTI.
-#ifndef ROCKSDB_USE_RTTI
-#define TBB_USE_EXCEPTIONS 0
-#endif
 #include "tbb/concurrent_hash_map.h"

 #include "cache/sharded_cache.h"
@@ -586,7 +581,7 @@ Status ClockCacheShard::Insert(const Slice& key, uint32_t hash, void* value,
                               size_t charge,
                               void (*deleter)(const Slice& key, void* value),
                               Cache::Handle** out_handle,
-                               Cache::Priority /*priority*/) {
+                               Cache::Priority priority) {
  CleanupContext context;
  HashTable::accessor accessor;
  char* key_data = new char[key.size()];
@@ -22,7 +22,7 @@

 namespace rocksdb {

-LRUHandleTable::LRUHandleTable() : list_(nullptr), length_(0), elems_(0) {
+LRUHandleTable::LRUHandleTable() : length_(0), elems_(0), list_(nullptr) {
  Resize();
 }

@@ -100,9 +100,7 @@ void LRUHandleTable::Resize() {
 }

 LRUCacheShard::LRUCacheShard()
-    : capacity_(0), high_pri_pool_usage_(0), strict_capacity_limit_(false),
-      high_pri_pool_ratio_(0), high_pri_pool_capacity_(0), usage_(0),
-      lru_usage_(0) {
+    : usage_(0), lru_usage_(0), high_pri_pool_usage_(0) {
  // Make empty circular linked list
  lru_.next = &lru_;
  lru_.prev = &lru_;
@@ -159,21 +157,6 @@ void LRUCacheShard::TEST_GetLRUList(LRUHandle** lru, LRUHandle** lru_low_pri) {
  *lru_low_pri = lru_low_pri_;
 }

-size_t LRUCacheShard::TEST_GetLRUSize() {
-  LRUHandle* lru_handle = lru_.next;
-  size_t lru_size = 0;
-  while (lru_handle != &lru_) {
-    lru_size++;
-    lru_handle = lru_handle->next;
-  }
-  return lru_size;
-}
-
-double LRUCacheShard::GetHighPriPoolRatio() {
-  MutexLock l(&mutex_);
-  return high_pri_pool_ratio_;
-}
-
 void LRUCacheShard::LRU_Remove(LRUHandle* e) {
  assert(e->next != nullptr);
  assert(e->prev != nullptr);
@@ -240,22 +223,6 @@ void LRUCacheShard::EvictFromLRU(size_t charge,
  }
 }

-void* LRUCacheShard::operator new(size_t size) {
-  return port::cacheline_aligned_alloc(size);
-}
-
-void* LRUCacheShard::operator new[](size_t size) {
-  return port::cacheline_aligned_alloc(size);
-}
-
-void LRUCacheShard::operator delete(void *memblock) {
-  port::cacheline_aligned_free(memblock);
-}
-
-void LRUCacheShard::operator delete[](void* memblock) {
-  port::cacheline_aligned_free(memblock);
-}
-
 void LRUCacheShard::SetCapacity(size_t capacity) {
  autovector<LRUHandle*> last_reference_list;
  {
@@ -360,7 +327,6 @@ Status LRUCacheShard::Insert(const Slice& key, uint32_t hash, void* value,
  e->deleter = deleter;
  e->charge = charge;
  e->key_length = key.size();
-  e->flags = 0;
  e->hash = hash;
  e->refs = (handle == nullptr
                 ? 1
@@ -472,11 +438,11 @@ std::string LRUCacheShard::GetPrintableOptions() const {
 LRUCache::LRUCache(size_t capacity, int num_shard_bits,
                   bool strict_capacity_limit, double high_pri_pool_ratio)
    : ShardedCache(capacity, num_shard_bits, strict_capacity_limit) {
-  num_shards_ = 1 << num_shard_bits;
-  shards_ = new LRUCacheShard[num_shards_];
+  int num_shards = 1 << num_shard_bits;
+  shards_ = new LRUCacheShard[num_shards];
  SetCapacity(capacity);
  SetStrictCapacityLimit(strict_capacity_limit);
-  for (int i = 0; i < num_shards_; i++) {
+  for (int i = 0; i < num_shards; i++) {
    shards_[i].SetHighPriorityPoolRatio(high_pri_pool_ratio);
  }
 }
@@ -503,34 +469,7 @@ uint32_t LRUCache::GetHash(Handle* handle) const {
  return reinterpret_cast<const LRUHandle*>(handle)->hash;
 }

-void LRUCache::DisownData() {
-// Do not drop data if compile with ASAN to suppress leak warning.
-#ifndef __SANITIZE_ADDRESS__
-  shards_ = nullptr;
-#endif  // !__SANITIZE_ADDRESS__
-}
-
-size_t LRUCache::TEST_GetLRUSize() {
-  size_t lru_size_of_all_shards = 0;
-  for (int i = 0; i < num_shards_; i++) {
-    lru_size_of_all_shards += shards_[i].TEST_GetLRUSize();
-  }
-  return lru_size_of_all_shards;
-}
-
-double LRUCache::GetHighPriPoolRatio() {
-  double result = 0.0;
-  if (num_shards_ > 0) {
-    result = shards_[0].GetHighPriPoolRatio();
-  }
-  return result;
-}
-
-std::shared_ptr<Cache> NewLRUCache(const LRUCacheOptions& cache_opts) {
-  return NewLRUCache(cache_opts.capacity, cache_opts.num_shard_bits,
-                     cache_opts.strict_capacity_limit,
-                     cache_opts.high_pri_pool_ratio);
-}
+void LRUCache::DisownData() { shards_ = nullptr; }

 std::shared_ptr<Cache> NewLRUCache(size_t capacity, int num_shard_bits,
                                   bool strict_capacity_limit,
@@ -57,7 +57,7 @@ struct LRUHandle {
  // Include the following flags:
  //   in_cache:    whether this entry is referenced by the hash table.
  //   is_high_pri: whether this entry is high priority entry.
-  //   in_high_pri_pool: whether this entry is in high-pri pool.
+  //   in_high_pro_pool: whether this entry is in high-pri pool.
  char flags;

  uint32_t hash;     // Hash of key(); used for fast sharding and comparisons
@@ -148,13 +148,13 @@ class LRUHandleTable {

  // The table consists of an array of buckets where each bucket is
  // a linked list of cache entries that hash into the bucket.
-  LRUHandle** list_;
  uint32_t length_;
  uint32_t elems_;
+  LRUHandle** list_;
 };

 // A single shard of sharded cache.
-class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard : public CacheShard {
+class LRUCacheShard : public CacheShard {
 public:
  LRUCacheShard();
  virtual ~LRUCacheShard();
@@ -198,22 +198,6 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard : public CacheShard {

  void TEST_GetLRUList(LRUHandle** lru, LRUHandle** lru_low_pri);

-  //  Retrieves number of elements in LRU, for unit test purpose only
-  //  not threadsafe
-  size_t TEST_GetLRUSize();
-
-  //  Retrives high pri pool ratio
-  double GetHighPriPoolRatio();
-
-  // Overloading to aligned it to cache line size
-  void* operator new(size_t);
-
-  void* operator new[](size_t);
-
-  void operator delete(void *);
-
-  void operator delete[](void*);
-
 private:
  void LRU_Remove(LRUHandle* e);
  void LRU_Insert(LRUHandle* e);
@@ -235,6 +219,12 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard : public CacheShard {
  // Initialized before use.
  size_t capacity_;

+  // Memory size for entries residing in the cache
+  size_t usage_;
+
+  // Memory size for entries residing only in the LRU list
+  size_t lru_usage_;
+
  // Memory size for entries in high-pri pool.
  size_t high_pri_pool_usage_;

@@ -248,6 +238,11 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard : public CacheShard {
  // Remember the value to avoid recomputing each time.
  double high_pri_pool_capacity_;

+  // mutex_ protects the following state.
+  // We don't count mutex_ as the cache's internal state so semantically we
+  // don't mind mutex_ invoking the non-const actions.
+  mutable port::Mutex mutex_;
+
  // Dummy head of LRU list.
  // lru.prev is newest entry, lru.next is oldest entry.
  // LRU contains items which can be evicted, ie reference only by cache
@@ -256,29 +251,7 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard : public CacheShard {
  // Pointer to head of low-pri pool in LRU list.
  LRUHandle* lru_low_pri_;

-  // ------------^^^^^^^^^^^^^-----------
-  // Not frequently modified data members
-  // ------------------------------------
-  //
-  // We separate data members that are updated frequently from the ones that
-  // are not frequently updated so that they don't share the same cache line
-  // which will lead into false cache sharing
-  //
-  // ------------------------------------
-  // Frequently modified data members
-  // ------------vvvvvvvvvvvvv-----------
  LRUHandleTable table_;
-
-  // Memory size for entries residing in the cache
-  size_t usage_;
-
-  // Memory size for entries residing only in the LRU list
-  size_t lru_usage_;
-
-  // mutex_ protects the following state.
-  // We don't count mutex_ as the cache's internal state so semantically we
-  // don't mind mutex_ invoking the non-const actions.
-  mutable port::Mutex mutex_;
 };

 class LRUCache : public ShardedCache {
@@ -294,14 +267,8 @@ class LRUCache : public ShardedCache {
  virtual uint32_t GetHash(Handle* handle) const override;
  virtual void DisownData() override;

-  //  Retrieves number of elements in LRU, for unit test purpose only
-  size_t TEST_GetLRUSize();
-  //  Retrives high pri pool ratio
-  double GetHighPriPoolRatio();
-
 private:
  LRUCacheShard* shards_;
-  int num_shards_ = 0;
 };

 }  // namespace rocksdb
@@ -17,16 +17,7 @@ class LRUCacheTest : public testing::Test {
  ~LRUCacheTest() {}

  void NewCache(size_t capacity, double high_pri_pool_ratio = 0.0) {
-    cache_.reset(
-#if defined(_MSC_VER)
-#pragma warning(push)
-#pragma warning(disable: 4316) // We've validated the alignment with the new operators
-#endif
-      new LRUCacheShard()
-#if defined(_MSC_VER)
-#pragma warning(pop)
-#endif
-    );
+    cache_.reset(new LRUCacheShard());
    cache_->SetCapacity(capacity);
    cache_->SetStrictCapacityLimit(false);
    cache_->SetHighPriorityPoolRatio(high_pri_pool_ratio);
@@ -53,7 +53,7 @@ Status ShardedCache::Insert(const Slice& key, void* value, size_t charge,
      ->Insert(key, hash, value, charge, deleter, handle, priority);
 }

-Cache::Handle* ShardedCache::Lookup(const Slice& key, Statistics* /*stats*/) {
+Cache::Handle* ShardedCache::Lookup(const Slice& key, Statistics* stats) {
  uint32_t hash = HashSlice(key);
  return GetShard(Shard(hash))->Lookup(key, hash);
 }
@@ -1,3 +0,0 @@
-@PACKAGE_INIT@
-include("${CMAKE_CURRENT_LIST_DIR}/RocksDBTargets.cmake")
-check_required_components(RocksDB)
@@ -1,21 +0,0 @@
-# - Find NUMA
-# Find the NUMA library and includes
-#
-# NUMA_INCLUDE_DIR - where to find numa.h, etc.
-# NUMA_LIBRARIES - List of libraries when using NUMA.
-# NUMA_FOUND - True if NUMA found.
-
-find_path(NUMA_INCLUDE_DIR
-  NAMES numa.h numaif.h
-  HINTS ${NUMA_ROOT_DIR}/include)
-
-find_library(NUMA_LIBRARIES
-  NAMES numa
-  HINTS ${NUMA_ROOT_DIR}/lib)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(NUMA DEFAULT_MSG NUMA_LIBRARIES NUMA_INCLUDE_DIR)
-
-mark_as_advanced(
-  NUMA_LIBRARIES
-  NUMA_INCLUDE_DIR)
@@ -1,21 +0,0 @@
-# - Find TBB
-# Find the Thread Building Blocks library and includes
-#
-# TBB_INCLUDE_DIR - where to find tbb.h, etc.
-# TBB_LIBRARIES - List of libraries when using TBB.
-# TBB_FOUND - True if TBB found.
-
-find_path(TBB_INCLUDE_DIR
-NAMES tbb/tbb.h
-HINTS ${TBB_ROOT_DIR}/include)
-
-find_library(TBB_LIBRARIES
-NAMES tbb
-HINTS ${TBB_ROOT_DIR}/lib)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(TBB DEFAULT_MSG TBB_LIBRARIES TBB_INCLUDE_DIR)
-
-mark_as_advanced(
-TBB_LIBRARIES
-TBB_INCLUDE_DIR)
@@ -1,21 +0,0 @@
-# - Find Bzip2
-# Find the bzip2 compression library and includes
-#
-# BZIP2_INCLUDE_DIR - where to find bzlib.h, etc.
-# BZIP2_LIBRARIES - List of libraries when using bzip2.
-# BZIP2_FOUND - True if bzip2 found.
-
-find_path(BZIP2_INCLUDE_DIR
-  NAMES bzlib.h
-  HINTS ${BZIP2_ROOT_DIR}/include)
-
-find_library(BZIP2_LIBRARIES
-  NAMES bz2
-  HINTS ${BZIP2_ROOT_DIR}/lib)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(bzip2 DEFAULT_MSG BZIP2_LIBRARIES BZIP2_INCLUDE_DIR)
-
-mark_as_advanced(
-  BZIP2_LIBRARIES
-  BZIP2_INCLUDE_DIR)
@@ -1,21 +0,0 @@
-# - Find Lz4
-# Find the lz4 compression library and includes
-#
-# LZ4_INCLUDE_DIR - where to find lz4.h, etc.
-# LZ4_LIBRARIES - List of libraries when using lz4.
-# LZ4_FOUND - True if lz4 found.
-
-find_path(LZ4_INCLUDE_DIR
-  NAMES lz4.h
-  HINTS ${LZ4_ROOT_DIR}/include)
-
-find_library(LZ4_LIBRARIES
-  NAMES lz4
-  HINTS ${LZ4_ROOT_DIR}/lib)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(lz4 DEFAULT_MSG LZ4_LIBRARIES LZ4_INCLUDE_DIR)
-
-mark_as_advanced(
-  LZ4_LIBRARIES
-  LZ4_INCLUDE_DIR)
@@ -1,21 +0,0 @@
-# - Find zlib
-# Find the zlib compression library and includes
-#
-# ZLIB_INCLUDE_DIR - where to find zlib.h, etc.
-# ZLIB_LIBRARIES - List of libraries when using zlib.
-# ZLIB_FOUND - True if zlib found.
-
-find_path(ZLIB_INCLUDE_DIR
-  NAMES zlib.h
-  HINTS ${ZLIB_ROOT_DIR}/include)
-
-find_library(ZLIB_LIBRARIES
-  NAMES z
-  HINTS ${ZLIB_ROOT_DIR}/lib)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(zlib DEFAULT_MSG ZLIB_LIBRARIES ZLIB_INCLUDE_DIR)
-
-mark_as_advanced(
-  ZLIB_LIBRARIES
-  ZLIB_INCLUDE_DIR)
@@ -1,21 +0,0 @@
-# - Find zstd
-# Find the zstd compression library and includes
-#
-# ZSTD_INCLUDE_DIR - where to find zstd.h, etc.
-# ZSTD_LIBRARIES - List of libraries when using zstd.
-# ZSTD_FOUND - True if zstd found.
-
-find_path(ZSTD_INCLUDE_DIR
-  NAMES zstd.h
-  HINTS ${ZSTD_ROOT_DIR}/include)
-
-find_library(ZSTD_LIBRARIES
-  NAMES zstd
-  HINTS ${ZSTD_ROOT_DIR}/lib)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(zstd DEFAULT_MSG ZSTD_LIBRARIES ZSTD_INCLUDE_DIR)
-
-mark_as_advanced(
-  ZSTD_LIBRARIES
-  ZSTD_INCLUDE_DIR)
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash

 # Exit on error.
 set -e
@@ -72,7 +72,7 @@ def display_file_coverage(per_file_coverage, total_coverage):
    header_template = \
        "%" + str(max_file_name_length) + "s\t%s\t%s"
    separator = "-" * (max_file_name_length + 10 + 20)
-    print header_template % ("Filename", "Coverage", "Lines")  # noqa: E999 T25377293 Grandfathered in
+    print header_template % ("Filename", "Coverage", "Lines")
    print separator

    # -- Print body
@@ -45,37 +45,36 @@ TableBuilder* NewTableBuilder(
        int_tbl_prop_collector_factories,
    uint32_t column_family_id, const std::string& column_family_name,
    WritableFileWriter* file, const CompressionType compression_type,
-    const CompressionOptions& compression_opts, int level,
-    const std::string* compression_dict, const bool skip_filters,
-    const uint64_t creation_time, const uint64_t oldest_key_time) {
+    const CompressionOptions& compression_opts,
+    int level,
+    const std::string* compression_dict, const bool skip_filters) {
  assert((column_family_id ==
          TablePropertiesCollectorFactory::Context::kUnknownColumnFamily) ==
         column_family_name.empty());
  return ioptions.table_factory->NewTableBuilder(
-      TableBuilderOptions(
-          ioptions, internal_comparator, int_tbl_prop_collector_factories,
-          compression_type, compression_opts, compression_dict, skip_filters,
-          column_family_name, level, creation_time, oldest_key_time),
+      TableBuilderOptions(ioptions, internal_comparator,
+                          int_tbl_prop_collector_factories, compression_type,
+                          compression_opts, compression_dict, skip_filters,
+                          column_family_name, level),
      column_family_id, file);
 }

 Status BuildTable(
    const std::string& dbname, Env* env, const ImmutableCFOptions& ioptions,
-    const MutableCFOptions& /*mutable_cf_options*/,
-    const EnvOptions& env_options, TableCache* table_cache,
-    InternalIterator* iter, std::unique_ptr<InternalIterator> range_del_iter,
-    FileMetaData* meta, const InternalKeyComparator& internal_comparator,
+    const MutableCFOptions& mutable_cf_options, const EnvOptions& env_options,
+    TableCache* table_cache, InternalIterator* iter,
+    std::unique_ptr<InternalIterator> range_del_iter, FileMetaData* meta,
+    const InternalKeyComparator& internal_comparator,
    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
        int_tbl_prop_collector_factories,
    uint32_t column_family_id, const std::string& column_family_name,
    std::vector<SequenceNumber> snapshots,
    SequenceNumber earliest_write_conflict_snapshot,
-    SnapshotChecker* snapshot_checker, const CompressionType compression,
+    const CompressionType compression,
    const CompressionOptions& compression_opts, bool paranoid_file_checks,
    InternalStats* internal_stats, TableFileCreationReason reason,
    EventLogger* event_logger, int job_id, const Env::IOPriority io_priority,
-    TableProperties* table_properties, int level, const uint64_t creation_time,
-    const uint64_t oldest_key_time, Env::WriteLifeTimeHint write_hint) {
+    TableProperties* table_properties, int level) {
  assert((column_family_id ==
          TablePropertiesCollectorFactory::Context::kUnknownColumnFamily) ==
         column_family_name.empty());
@@ -117,26 +116,24 @@ Status BuildTable(
        return s;
      }
      file->SetIOPriority(io_priority);
-      file->SetWriteLifeTimeHint(write_hint);

      file_writer.reset(new WritableFileWriter(std::move(file), env_options,
                                               ioptions.statistics));
+
      builder = NewTableBuilder(
          ioptions, internal_comparator, int_tbl_prop_collector_factories,
          column_family_id, column_family_name, file_writer.get(), compression,
-          compression_opts, level, nullptr /* compression_dict */,
-          false /* skip_filters */, creation_time, oldest_key_time);
+          compression_opts, level);
    }

    MergeHelper merge(env, internal_comparator.user_comparator(),
                      ioptions.merge_operator, nullptr, ioptions.info_log,
                      true /* internal key corruption is not ok */,
-                      snapshots.empty() ? 0 : snapshots.back(),
-                      snapshot_checker);
+                      snapshots.empty() ? 0 : snapshots.back());

    CompactionIterator c_iter(
        iter, internal_comparator.user_comparator(), &merge, kMaxSequenceNumber,
-        &snapshots, earliest_write_conflict_snapshot, snapshot_checker, env,
+        &snapshots, earliest_write_conflict_snapshot, env,
        true /* internal key corruption is not ok */, range_del_agg.get());
    c_iter.SeekToFirst();
    for (; c_iter.Valid(); c_iter.Next()) {
@@ -29,7 +29,6 @@ struct FileMetaData;
 class Env;
 struct EnvOptions;
 class Iterator;
-class SnapshotChecker;
 class TableCache;
 class VersionEdit;
 class TableBuilder;
@@ -49,10 +48,10 @@ TableBuilder* NewTableBuilder(
        int_tbl_prop_collector_factories,
    uint32_t column_family_id, const std::string& column_family_name,
    WritableFileWriter* file, const CompressionType compression_type,
-    const CompressionOptions& compression_opts, int level,
+    const CompressionOptions& compression_opts,
+    int level,
    const std::string* compression_dict = nullptr,
-    const bool skip_filters = false, const uint64_t creation_time = 0,
-    const uint64_t oldest_key_time = 0);
+    const bool skip_filters = false);

 // Build a Table file from the contents of *iter.  The generated file
 // will be named according to number specified in meta. On success, the rest of
@@ -73,13 +72,11 @@ extern Status BuildTable(
    uint32_t column_family_id, const std::string& column_family_name,
    std::vector<SequenceNumber> snapshots,
    SequenceNumber earliest_write_conflict_snapshot,
-    SnapshotChecker* snapshot_checker, const CompressionType compression,
+    const CompressionType compression,
    const CompressionOptions& compression_opts, bool paranoid_file_checks,
    InternalStats* internal_stats, TableFileCreationReason reason,
    EventLogger* event_logger = nullptr, int job_id = 0,
    const Env::IOPriority io_priority = Env::IO_HIGH,
-    TableProperties* table_properties = nullptr, int level = -1,
-    const uint64_t creation_time = 0, const uint64_t oldest_key_time = 0,
-    Env::WriteLifeTimeHint write_hint = Env::WLTH_NOT_SET);
+    TableProperties* table_properties = nullptr, int level = -1);

 }  // namespace rocksdb
@@ -41,7 +41,6 @@ static char dbname[200];
 static char sstfilename[200];
 static char dbbackupname[200];
 static char dbcheckpointname[200];
-static char dbpathname[200];

 static void StartPhase(const char* name) {
  fprintf(stderr, "=== Test %s\n", name);
@@ -334,20 +333,6 @@ static void CheckTxnGet(
        Free(&val);
 }

-static void CheckTxnGetCF(rocksdb_transaction_t* txn,
-                          const rocksdb_readoptions_t* options,
-                          rocksdb_column_family_handle_t* column_family,
-                          const char* key, const char* expected) {
-  char* err = NULL;
-  size_t val_len;
-  char* val;
-  val = rocksdb_transaction_get_cf(txn, options, column_family, key,
-                                   strlen(key), &val_len, &err);
-  CheckNoError(err);
-  CheckEqual(expected, val, val_len);
-  Free(&val);
-}
-
 static void CheckTxnDBGet(
        rocksdb_transactiondb_t* txn_db,
        const rocksdb_readoptions_t* options,
@@ -362,25 +347,10 @@ static void CheckTxnDBGet(
        Free(&val);
 }

-static void CheckTxnDBGetCF(rocksdb_transactiondb_t* txn_db,
-                            const rocksdb_readoptions_t* options,
-                            rocksdb_column_family_handle_t* column_family,
-                            const char* key, const char* expected) {
-  char* err = NULL;
-  size_t val_len;
-  char* val;
-  val = rocksdb_transactiondb_get_cf(txn_db, options, column_family, key,
-                                     strlen(key), &val_len, &err);
-  CheckNoError(err);
-  CheckEqual(expected, val, val_len);
-  Free(&val);
-}
-
 int main(int argc, char** argv) {
  rocksdb_t* db;
  rocksdb_comparator_t* cmp;
  rocksdb_cache_t* cache;
-  rocksdb_dbpath_t *dbpath;
  rocksdb_env_t* env;
  rocksdb_options_t* options;
  rocksdb_compactoptions_t* coptions;
@@ -392,8 +362,6 @@ int main(int argc, char** argv) {
  rocksdb_transactiondb_options_t* txn_db_options;
  rocksdb_transaction_t* txn;
  rocksdb_transaction_options_t* txn_options;
-  rocksdb_optimistictransactiondb_t* otxn_db;
-  rocksdb_optimistictransaction_options_t* otxn_options;
  char* err = NULL;
  int run = -1;

@@ -417,14 +385,8 @@ int main(int argc, char** argv) {
           GetTempDir(),
           ((int)geteuid()));

-  snprintf(dbpathname, sizeof(dbpathname),
-           "%s/rocksdb_c_test-%d-dbpath",
-           GetTempDir(),
-           ((int) geteuid()));
-
  StartPhase("create_objects");
  cmp = rocksdb_comparator_create(NULL, CmpDestroy, CmpCompare, CmpName);
-  dbpath = rocksdb_dbpath_create(dbpathname, 1024 * 1024);
  env = rocksdb_create_default_env();
  cache = rocksdb_cache_create_lru(100000);

@@ -1395,18 +1357,6 @@ int main(int argc, char** argv) {
    CheckNoError(err);
    CheckTxnDBGet(txn_db, roptions, "foo", NULL);

-    // write batch into TransactionDB
-    rocksdb_writebatch_t* wb = rocksdb_writebatch_create();
-    rocksdb_writebatch_put(wb, "foo", 3, "a", 1);
-    rocksdb_writebatch_clear(wb);
-    rocksdb_writebatch_put(wb, "bar", 3, "b", 1);
-    rocksdb_writebatch_put(wb, "box", 3, "c", 1);
-    rocksdb_writebatch_delete(wb, "bar", 3);
-    rocksdb_transactiondb_write(txn_db, woptions, wb, &err);
-    rocksdb_writebatch_destroy(wb);
-    CheckTxnDBGet(txn_db, roptions, "box", "c");
-    CheckNoError(err);
-
    // begin a transaction
    txn = rocksdb_transaction_begin(txn_db, woptions, txn_options, NULL);
    // put
@@ -1463,42 +1413,6 @@ int main(int argc, char** argv) {
    CheckNoError(err);
    CheckTxnDBGet(txn_db, roptions, "bar", NULL);

-    // save point
-    rocksdb_transaction_put(txn, "foo1", 4, "hi1", 3, &err);
-    rocksdb_transaction_set_savepoint(txn);
-    CheckTxnGet(txn, roptions, "foo1", "hi1");
-    rocksdb_transaction_put(txn, "foo2", 4, "hi2", 3, &err);
-    CheckTxnGet(txn, roptions, "foo2", "hi2");
-
-    // rollback to savepoint
-    rocksdb_transaction_rollback_to_savepoint(txn, &err);
-    CheckNoError(err);
-    CheckTxnGet(txn, roptions, "foo2", NULL);
-    CheckTxnGet(txn, roptions, "foo1", "hi1");
-    CheckTxnDBGet(txn_db, roptions, "foo1", NULL);
-    CheckTxnDBGet(txn_db, roptions, "foo2", NULL);
-    rocksdb_transaction_commit(txn, &err);
-    CheckNoError(err);
-    CheckTxnDBGet(txn_db, roptions, "foo1", "hi1");
-    CheckTxnDBGet(txn_db, roptions, "foo2", NULL);
-
-    // Column families.
-    rocksdb_column_family_handle_t* cfh;
-    cfh = rocksdb_transactiondb_create_column_family(txn_db, options,
-                                                     "txn_db_cf", &err);
-    CheckNoError(err);
-
-    rocksdb_transactiondb_put_cf(txn_db, woptions, cfh, "cf_foo", 6, "cf_hello",
-                                 8, &err);
-    CheckNoError(err);
-    CheckTxnDBGetCF(txn_db, roptions, cfh, "cf_foo", "cf_hello");
-
-    rocksdb_transactiondb_delete_cf(txn_db, woptions, cfh, "cf_foo", 6, &err);
-    CheckNoError(err);
-    CheckTxnDBGetCF(txn_db, roptions, cfh, "cf_foo", NULL);
-
-    rocksdb_column_family_handle_destroy(cfh);
-
    // close and destroy
    rocksdb_transaction_destroy(txn);
    rocksdb_transactiondb_close(txn_db);
@@ -1508,105 +1422,6 @@ int main(int argc, char** argv) {
    rocksdb_transactiondb_options_destroy(txn_db_options);
  }

-  StartPhase("optimistic_transactions");
-  {
-    rocksdb_options_t* db_options = rocksdb_options_create();
-    rocksdb_options_set_create_if_missing(db_options, 1);
-    rocksdb_options_set_allow_concurrent_memtable_write(db_options, 1);
-    otxn_db = rocksdb_optimistictransactiondb_open(db_options, dbname, &err);
-    otxn_options = rocksdb_optimistictransaction_options_create();
-    rocksdb_transaction_t* txn1 = rocksdb_optimistictransaction_begin(
-        otxn_db, woptions, otxn_options, NULL);
-    rocksdb_transaction_t* txn2 = rocksdb_optimistictransaction_begin(
-        otxn_db, woptions, otxn_options, NULL);
-    rocksdb_transaction_put(txn1, "key", 3, "value", 5, &err);
-    CheckNoError(err);
-    rocksdb_transaction_put(txn2, "key1", 4, "value1", 6, &err);
-    CheckNoError(err);
-    CheckTxnGet(txn1, roptions, "key", "value");
-    rocksdb_transaction_commit(txn1, &err);
-    CheckNoError(err);
-    rocksdb_transaction_commit(txn2, &err);
-    CheckNoError(err);
-    rocksdb_transaction_destroy(txn1);
-    rocksdb_transaction_destroy(txn2);
-
-    // Check column family
-    db = rocksdb_optimistictransactiondb_get_base_db(otxn_db);
-    rocksdb_put(db, woptions, "key", 3, "value", 5, &err);
-    CheckNoError(err);
-    rocksdb_column_family_handle_t *cfh1, *cfh2;
-    cfh1 = rocksdb_create_column_family(db, db_options, "txn_db_cf1", &err);
-    cfh2 = rocksdb_create_column_family(db, db_options, "txn_db_cf2", &err);
-    txn = rocksdb_optimistictransaction_begin(otxn_db, woptions, otxn_options,
-                                              NULL);
-    rocksdb_transaction_put_cf(txn, cfh1, "key_cf1", 7, "val_cf1", 7, &err);
-    CheckNoError(err);
-    rocksdb_transaction_put_cf(txn, cfh2, "key_cf2", 7, "val_cf2", 7, &err);
-    CheckNoError(err);
-    rocksdb_transaction_commit(txn, &err);
-    CheckNoError(err);
-    txn = rocksdb_optimistictransaction_begin(otxn_db, woptions, otxn_options,
-                                              txn);
-    CheckGetCF(db, roptions, cfh1, "key_cf1", "val_cf1");
-    CheckTxnGetCF(txn, roptions, cfh1, "key_cf1", "val_cf1");
-
-    // Check iterator with column family
-    rocksdb_transaction_put_cf(txn, cfh1, "key1_cf", 7, "val1_cf", 7, &err);
-    CheckNoError(err);
-    rocksdb_iterator_t* iter =
-        rocksdb_transaction_create_iterator_cf(txn, roptions, cfh1);
-    CheckCondition(!rocksdb_iter_valid(iter));
-    rocksdb_iter_seek_to_first(iter);
-    CheckCondition(rocksdb_iter_valid(iter));
-    CheckIter(iter, "key1_cf", "val1_cf");
-    rocksdb_iter_get_error(iter, &err);
-    CheckNoError(err);
-    rocksdb_iter_destroy(iter);
-
-    rocksdb_transaction_destroy(txn);
-    rocksdb_column_family_handle_destroy(cfh1);
-    rocksdb_column_family_handle_destroy(cfh2);
-    rocksdb_optimistictransactiondb_close_base_db(db);
-    rocksdb_optimistictransactiondb_close(otxn_db);
-
-    // Check open optimistic transaction db with column families
-    size_t cf_len;
-    char** column_fams =
-        rocksdb_list_column_families(db_options, dbname, &cf_len, &err);
-    CheckNoError(err);
-    CheckEqual("default", column_fams[0], 7);
-    CheckEqual("txn_db_cf1", column_fams[1], 10);
-    CheckEqual("txn_db_cf2", column_fams[2], 10);
-    CheckCondition(cf_len == 3);
-    rocksdb_list_column_families_destroy(column_fams, cf_len);
-
-    const char* cf_names[3] = {"default", "txn_db_cf1", "txn_db_cf2"};
-    rocksdb_options_t* cf_options = rocksdb_options_create();
-    const rocksdb_options_t* cf_opts[3] = {cf_options, cf_options, cf_options};
-
-    rocksdb_options_set_error_if_exists(cf_options, 0);
-    rocksdb_column_family_handle_t* cf_handles[3];
-    otxn_db = rocksdb_optimistictransactiondb_open_column_families(
-        db_options, dbname, 3, cf_names, cf_opts, cf_handles, &err);
-    CheckNoError(err);
-    rocksdb_transaction_t* txn_cf = rocksdb_optimistictransaction_begin(
-        otxn_db, woptions, otxn_options, NULL);
-    CheckTxnGetCF(txn_cf, roptions, cf_handles[0], "key", "value");
-    CheckTxnGetCF(txn_cf, roptions, cf_handles[1], "key_cf1", "val_cf1");
-    CheckTxnGetCF(txn_cf, roptions, cf_handles[2], "key_cf2", "val_cf2");
-    rocksdb_transaction_destroy(txn_cf);
-    rocksdb_options_destroy(cf_options);
-    rocksdb_column_family_handle_destroy(cf_handles[0]);
-    rocksdb_column_family_handle_destroy(cf_handles[1]);
-    rocksdb_column_family_handle_destroy(cf_handles[2]);
-    rocksdb_optimistictransactiondb_close(otxn_db);
-    rocksdb_destroy_db(db_options, dbname, &err);
-    rocksdb_options_destroy(db_options);
-    rocksdb_optimistictransaction_options_destroy(otxn_options);
-    CheckNoError(err);
-  }
-
  // Simple sanity check that setting memtable rep works.
  StartPhase("memtable_reps");
  {
@@ -1625,18 +1440,6 @@ int main(int argc, char** argv) {
    CheckNoError(err);
  }

-  // Simple sanity check that options setting db_paths work.
-  StartPhase("open_db_paths");
-  {
-    rocksdb_close(db);
-    rocksdb_destroy_db(options, dbname, &err);
-
-    const rocksdb_dbpath_t* paths[1] = {dbpath};
-    rocksdb_options_set_db_paths(options, paths, 1);
-    db = rocksdb_open(options, dbname, &err);
-    CheckNoError(err);
-  }
-  
  StartPhase("cleanup");
  rocksdb_close(db);
  rocksdb_options_destroy(options);
@@ -1646,7 +1449,6 @@ int main(int argc, char** argv) {
  rocksdb_compactoptions_destroy(coptions);
  rocksdb_cache_destroy(cache);
  rocksdb_comparator_destroy(cmp);
-  rocksdb_dbpath_destroy(dbpath);
  rocksdb_env_destroy(env);

  fprintf(stderr, "PASS\n");
@@ -31,7 +31,6 @@
 #include "monitoring/thread_status_util.h"
 #include "options/options_helper.h"
 #include "table/block_based_table_factory.h"
-#include "table/merging_iterator.h"
 #include "util/autovector.h"
 #include "util/compression.h"

@@ -54,9 +53,6 @@ ColumnFamilyHandleImpl::~ColumnFamilyHandleImpl() {
 #endif  // ROCKSDB_LITE
    // Job id == 0 means that this is not our background process, but rather
    // user thread
-    // Need to hold some shared pointers owned by the initial_cf_options
-    // before final cleaning up finishes.
-    ColumnFamilyOptions initial_cf_options_copy = cfd_->initial_cf_options();
    JobContext job_context(0);
    mutex_->Lock();
    if (cfd_->Unref()) {
@@ -127,22 +123,6 @@ Status CheckCompressionSupported(const ColumnFamilyOptions& cf_options) {
          " is not linked with the binary.");
    }
  }
-  if (cf_options.compression_opts.zstd_max_train_bytes > 0) {
-    if (!CompressionTypeSupported(CompressionType::kZSTD)) {
-      // Dictionary trainer is available since v0.6.1, but ZSTD was marked
-      // stable only since v0.8.0. For now we enable the feature in stable
-      // versions only.
-      return Status::InvalidArgument(
-          "zstd dictionary trainer cannot be used because " +
-          CompressionTypeToString(CompressionType::kZSTD) +
-          " is not linked with the binary.");
-    }
-    if (cf_options.compression_opts.max_dict_bytes == 0) {
-      return Status::InvalidArgument(
-          "The dictionary size limit (`CompressionOptions::max_dict_bytes`) "
-          "should be nonzero if we're using zstd's dictionary generator.");
-    }
-  }
  return Status::OK();
 }

@@ -348,13 +328,12 @@ void SuperVersionUnrefHandle(void* ptr) {
  // When latter happens, we are in ~ColumnFamilyData(), no get should happen as
  // well.
  SuperVersion* sv = static_cast<SuperVersion*>(ptr);
-  bool was_last_ref __attribute__((__unused__));
-  was_last_ref = sv->Unref();
-  // Thread-local SuperVersions can't outlive ColumnFamilyData::super_version_.
-  // This is important because we can't do SuperVersion cleanup here.
-  // That would require locking DB mutex, which would deadlock because
-  // SuperVersionUnrefHandle is called with locked ThreadLocalPtr mutex.
-  assert(!was_last_ref);
+  if (sv->Unref()) {
+    sv->db_mutex->Lock();
+    sv->Cleanup();
+    sv->db_mutex->Unlock();
+    delete sv;
+  }
 }
 }  // anonymous namespace

@@ -374,8 +353,8 @@ ColumnFamilyData::ColumnFamilyData(
      initial_cf_options_(SanitizeOptions(db_options, cf_options)),
      ioptions_(db_options, initial_cf_options_),
      mutable_cf_options_(initial_cf_options_),
-      is_delete_range_supported_(
-          cf_options.table_factory->IsDeleteRangeSupported()),
+      is_delete_range_supported_(strcmp(cf_options.table_factory->Name(),
+                                        BlockBasedTableFactory().Name()) == 0),
      write_buffer_manager_(write_buffer_manager),
      mem_(nullptr),
      imm_(ioptions_.min_write_buffer_number_to_merge,
@@ -386,13 +365,11 @@ ColumnFamilyData::ColumnFamilyData(
      next_(nullptr),
      prev_(nullptr),
      log_number_(0),
-      flush_reason_(FlushReason::kOthers),
      column_family_set_(column_family_set),
      pending_flush_(false),
      pending_compaction_(false),
      prev_compaction_needed_bytes_(0),
-      allow_2pc_(db_options.allow_2pc),
-      last_memtable_id_(0) {
+      allow_2pc_(db_options.allow_2pc) {
  Ref();

  // Convert user defined table properties collector factories to internal ones.
@@ -475,7 +452,7 @@ ColumnFamilyData::~ColumnFamilyData() {
    local_sv_.reset();
    super_version_->db_mutex->Lock();

-    bool is_last_reference __attribute__((__unused__));
+    bool is_last_reference __attribute__((unused));
    is_last_reference = super_version_->Unref();
    assert(is_last_reference);
    super_version_->Cleanup();
@@ -486,8 +463,7 @@ ColumnFamilyData::~ColumnFamilyData() {
  if (dummy_versions_ != nullptr) {
    // List must be empty
    assert(dummy_versions_->TEST_Next() == dummy_versions_);
-    bool deleted __attribute__((__unused__));
-    deleted = dummy_versions_->Unref();
+    bool deleted __attribute__((unused)) = dummy_versions_->Unref();
    assert(deleted);
  }

@@ -637,97 +613,58 @@ int GetL0ThresholdSpeedupCompaction(int level0_file_num_compaction_trigger,
 }
 }  // namespace

-std::pair<WriteStallCondition, ColumnFamilyData::WriteStallCause>
-ColumnFamilyData::GetWriteStallConditionAndCause(
-    int num_unflushed_memtables, int num_l0_files,
-    uint64_t num_compaction_needed_bytes,
-    const MutableCFOptions& mutable_cf_options) {
-  if (num_unflushed_memtables >= mutable_cf_options.max_write_buffer_number) {
-    return {WriteStallCondition::kStopped, WriteStallCause::kMemtableLimit};
-  } else if (!mutable_cf_options.disable_auto_compactions &&
-             num_l0_files >= mutable_cf_options.level0_stop_writes_trigger) {
-    return {WriteStallCondition::kStopped, WriteStallCause::kL0FileCountLimit};
-  } else if (!mutable_cf_options.disable_auto_compactions &&
-             mutable_cf_options.hard_pending_compaction_bytes_limit > 0 &&
-             num_compaction_needed_bytes >=
-                 mutable_cf_options.hard_pending_compaction_bytes_limit) {
-    return {WriteStallCondition::kStopped,
-            WriteStallCause::kPendingCompactionBytes};
-  } else if (mutable_cf_options.max_write_buffer_number > 3 &&
-             num_unflushed_memtables >=
-                 mutable_cf_options.max_write_buffer_number - 1) {
-    return {WriteStallCondition::kDelayed, WriteStallCause::kMemtableLimit};
-  } else if (!mutable_cf_options.disable_auto_compactions &&
-             mutable_cf_options.level0_slowdown_writes_trigger >= 0 &&
-             num_l0_files >=
-                 mutable_cf_options.level0_slowdown_writes_trigger) {
-    return {WriteStallCondition::kDelayed, WriteStallCause::kL0FileCountLimit};
-  } else if (!mutable_cf_options.disable_auto_compactions &&
-             mutable_cf_options.soft_pending_compaction_bytes_limit > 0 &&
-             num_compaction_needed_bytes >=
-                 mutable_cf_options.soft_pending_compaction_bytes_limit) {
-    return {WriteStallCondition::kDelayed,
-            WriteStallCause::kPendingCompactionBytes};
-  }
-  return {WriteStallCondition::kNormal, WriteStallCause::kNone};
-}
-
-WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
+void ColumnFamilyData::RecalculateWriteStallConditions(
      const MutableCFOptions& mutable_cf_options) {
-  auto write_stall_condition = WriteStallCondition::kNormal;
  if (current_ != nullptr) {
    auto* vstorage = current_->storage_info();
    auto write_controller = column_family_set_->write_controller_;
    uint64_t compaction_needed_bytes =
        vstorage->estimated_compaction_needed_bytes();

-    auto write_stall_condition_and_cause = GetWriteStallConditionAndCause(
-        imm()->NumNotFlushed(), vstorage->l0_delay_trigger_count(),
-        vstorage->estimated_compaction_needed_bytes(), mutable_cf_options);
-    write_stall_condition = write_stall_condition_and_cause.first;
-    auto write_stall_cause = write_stall_condition_and_cause.second;
-
    bool was_stopped = write_controller->IsStopped();
    bool needed_delay = write_controller->NeedsDelay();

-    if (write_stall_condition == WriteStallCondition::kStopped &&
-        write_stall_cause == WriteStallCause::kMemtableLimit) {
+    if (imm()->NumNotFlushed() >= mutable_cf_options.max_write_buffer_number) {
      write_controller_token_ = write_controller->GetStopToken();
-      internal_stats_->AddCFStats(InternalStats::MEMTABLE_LIMIT_STOPS, 1);
+      internal_stats_->AddCFStats(InternalStats::MEMTABLE_COMPACTION, 1);
      ROCKS_LOG_WARN(
          ioptions_.info_log,
          "[%s] Stopping writes because we have %d immutable memtables "
          "(waiting for flush), max_write_buffer_number is set to %d",
          name_.c_str(), imm()->NumNotFlushed(),
          mutable_cf_options.max_write_buffer_number);
-    } else if (write_stall_condition == WriteStallCondition::kStopped &&
-               write_stall_cause == WriteStallCause::kL0FileCountLimit) {
+    } else if (!mutable_cf_options.disable_auto_compactions &&
+               vstorage->l0_delay_trigger_count() >=
+                   mutable_cf_options.level0_stop_writes_trigger) {
      write_controller_token_ = write_controller->GetStopToken();
-      internal_stats_->AddCFStats(InternalStats::L0_FILE_COUNT_LIMIT_STOPS, 1);
+      internal_stats_->AddCFStats(InternalStats::LEVEL0_NUM_FILES_TOTAL, 1);
      if (compaction_picker_->IsLevel0CompactionInProgress()) {
        internal_stats_->AddCFStats(
-            InternalStats::LOCKED_L0_FILE_COUNT_LIMIT_STOPS, 1);
+            InternalStats::LEVEL0_NUM_FILES_WITH_COMPACTION, 1);
      }
      ROCKS_LOG_WARN(ioptions_.info_log,
                     "[%s] Stopping writes because we have %d level-0 files",
                     name_.c_str(), vstorage->l0_delay_trigger_count());
-    } else if (write_stall_condition == WriteStallCondition::kStopped &&
-               write_stall_cause == WriteStallCause::kPendingCompactionBytes) {
+    } else if (!mutable_cf_options.disable_auto_compactions &&
+               mutable_cf_options.hard_pending_compaction_bytes_limit > 0 &&
+               compaction_needed_bytes >=
+                   mutable_cf_options.hard_pending_compaction_bytes_limit) {
      write_controller_token_ = write_controller->GetStopToken();
      internal_stats_->AddCFStats(
-          InternalStats::PENDING_COMPACTION_BYTES_LIMIT_STOPS, 1);
+          InternalStats::HARD_PENDING_COMPACTION_BYTES_LIMIT, 1);
      ROCKS_LOG_WARN(
          ioptions_.info_log,
          "[%s] Stopping writes because of estimated pending compaction "
          "bytes %" PRIu64,
          name_.c_str(), compaction_needed_bytes);
-    } else if (write_stall_condition == WriteStallCondition::kDelayed &&
-               write_stall_cause == WriteStallCause::kMemtableLimit) {
+    } else if (mutable_cf_options.max_write_buffer_number > 3 &&
+               imm()->NumNotFlushed() >=
+                   mutable_cf_options.max_write_buffer_number - 1) {
      write_controller_token_ =
          SetupDelay(write_controller, compaction_needed_bytes,
                     prev_compaction_needed_bytes_, was_stopped,
                     mutable_cf_options.disable_auto_compactions);
-      internal_stats_->AddCFStats(InternalStats::MEMTABLE_LIMIT_SLOWDOWNS, 1);
+      internal_stats_->AddCFStats(InternalStats::MEMTABLE_SLOWDOWN, 1);
      ROCKS_LOG_WARN(
          ioptions_.info_log,
          "[%s] Stalling writes because we have %d immutable memtables "
@@ -736,8 +673,10 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
          name_.c_str(), imm()->NumNotFlushed(),
          mutable_cf_options.max_write_buffer_number,
          write_controller->delayed_write_rate());
-    } else if (write_stall_condition == WriteStallCondition::kDelayed &&
-               write_stall_cause == WriteStallCause::kL0FileCountLimit) {
+    } else if (!mutable_cf_options.disable_auto_compactions &&
+               mutable_cf_options.level0_slowdown_writes_trigger >= 0 &&
+               vstorage->l0_delay_trigger_count() >=
+                   mutable_cf_options.level0_slowdown_writes_trigger) {
      // L0 is the last two files from stopping.
      bool near_stop = vstorage->l0_delay_trigger_count() >=
                       mutable_cf_options.level0_stop_writes_trigger - 2;
@@ -745,19 +684,20 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
          SetupDelay(write_controller, compaction_needed_bytes,
                     prev_compaction_needed_bytes_, was_stopped || near_stop,
                     mutable_cf_options.disable_auto_compactions);
-      internal_stats_->AddCFStats(InternalStats::L0_FILE_COUNT_LIMIT_SLOWDOWNS,
-                                  1);
+      internal_stats_->AddCFStats(InternalStats::LEVEL0_SLOWDOWN_TOTAL, 1);
      if (compaction_picker_->IsLevel0CompactionInProgress()) {
        internal_stats_->AddCFStats(
-            InternalStats::LOCKED_L0_FILE_COUNT_LIMIT_SLOWDOWNS, 1);
+            InternalStats::LEVEL0_SLOWDOWN_WITH_COMPACTION, 1);
      }
      ROCKS_LOG_WARN(ioptions_.info_log,
                     "[%s] Stalling writes because we have %d level-0 files "
                     "rate %" PRIu64,
                     name_.c_str(), vstorage->l0_delay_trigger_count(),
                     write_controller->delayed_write_rate());
-    } else if (write_stall_condition == WriteStallCondition::kDelayed &&
-               write_stall_cause == WriteStallCause::kPendingCompactionBytes) {
+    } else if (!mutable_cf_options.disable_auto_compactions &&
+               mutable_cf_options.soft_pending_compaction_bytes_limit > 0 &&
+               vstorage->estimated_compaction_needed_bytes() >=
+                   mutable_cf_options.soft_pending_compaction_bytes_limit) {
      // If the distance to hard limit is less than 1/4 of the gap between soft
      // and
      // hard bytes limit, we think it is near stop and speed up the slowdown.
@@ -774,7 +714,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
                     prev_compaction_needed_bytes_, was_stopped || near_stop,
                     mutable_cf_options.disable_auto_compactions);
      internal_stats_->AddCFStats(
-          InternalStats::PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS, 1);
+          InternalStats::SOFT_PENDING_COMPACTION_BYTES_LIMIT, 1);
      ROCKS_LOG_WARN(
          ioptions_.info_log,
          "[%s] Stalling writes because of estimated pending compaction "
@@ -782,7 +722,6 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
          name_.c_str(), vstorage->estimated_compaction_needed_bytes(),
          write_controller->delayed_write_rate());
    } else {
-      assert(write_stall_condition == WriteStallCondition::kNormal);
      if (vstorage->l0_delay_trigger_count() >=
          GetL0ThresholdSpeedupCompaction(
              mutable_cf_options.level0_file_num_compaction_trigger,
@@ -830,7 +769,6 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
    }
    prev_compaction_needed_bytes_ = compaction_needed_bytes;
  }
-  return write_stall_condition;
 }

 const EnvOptions* ColumnFamilyData::soptions() const {
@@ -849,10 +787,6 @@ uint64_t ColumnFamilyData::GetTotalSstFilesSize() const {
  return VersionSet::GetTotalSstFilesSize(dummy_versions_);
 }

-uint64_t ColumnFamilyData::GetLiveSstFilesSize() const {
-  return current_->GetSstFilesSize();
-}
-
 MemTable* ColumnFamilyData::ConstructNewMemtable(
    const MutableCFOptions& mutable_cf_options, SequenceNumber earliest_seq) {
  return new MemTable(internal_comparator_, ioptions_, mutable_cf_options,
@@ -889,68 +823,6 @@ bool ColumnFamilyData::RangeOverlapWithCompaction(
      smallest_user_key, largest_user_key, level);
 }

-Status ColumnFamilyData::RangesOverlapWithMemtables(
-    const autovector<Range>& ranges, SuperVersion* super_version,
-    bool* overlap) {
-  assert(overlap != nullptr);
-  *overlap = false;
-  // Create an InternalIterator over all unflushed memtables
-  Arena arena;
-  ReadOptions read_opts;
-  read_opts.total_order_seek = true;
-  MergeIteratorBuilder merge_iter_builder(&internal_comparator_, &arena);
-  merge_iter_builder.AddIterator(
-      super_version->mem->NewIterator(read_opts, &arena));
-  super_version->imm->AddIterators(read_opts, &merge_iter_builder);
-  ScopedArenaIterator memtable_iter(merge_iter_builder.Finish());
-
-  std::vector<InternalIterator*> memtable_range_del_iters;
-  auto* active_range_del_iter =
-      super_version->mem->NewRangeTombstoneIterator(read_opts);
-  if (active_range_del_iter != nullptr) {
-    memtable_range_del_iters.push_back(active_range_del_iter);
-  }
-  super_version->imm->AddRangeTombstoneIterators(read_opts,
-                                                 &memtable_range_del_iters);
-  RangeDelAggregator range_del_agg(internal_comparator_, {} /* snapshots */,
-                                   false /* collapse_deletions */);
-  Status status;
-  {
-    std::unique_ptr<InternalIterator> memtable_range_del_iter(
-        NewMergingIterator(&internal_comparator_,
-                           memtable_range_del_iters.empty()
-                               ? nullptr
-                               : &memtable_range_del_iters[0],
-                           static_cast<int>(memtable_range_del_iters.size())));
-    status = range_del_agg.AddTombstones(std::move(memtable_range_del_iter));
-  }
-  for (size_t i = 0; i < ranges.size() && status.ok() && !*overlap; ++i) {
-    auto* vstorage = super_version->current->storage_info();
-    auto* ucmp = vstorage->InternalComparator()->user_comparator();
-    InternalKey range_start(ranges[i].start, kMaxSequenceNumber,
-                            kValueTypeForSeek);
-    memtable_iter->Seek(range_start.Encode());
-    status = memtable_iter->status();
-    ParsedInternalKey seek_result;
-    if (status.ok()) {
-      if (memtable_iter->Valid() &&
-          !ParseInternalKey(memtable_iter->key(), &seek_result)) {
-        status = Status::Corruption("DB have corrupted keys");
-      }
-    }
-    if (status.ok()) {
-      if (memtable_iter->Valid() &&
-          ucmp->Compare(seek_result.user_key, ranges[i].limit) <= 0) {
-        *overlap = true;
-      } else if (range_del_agg.IsRangeOverlapped(ranges[i].start,
-                                                 ranges[i].limit)) {
-        *overlap = true;
-      }
-    }
-  }
-  return status;
-}
-
 const int ColumnFamilyData::kCompactAllLevels = -1;
 const int ColumnFamilyData::kCompactToBaseLevel = -2;

@@ -969,13 +841,10 @@ Compaction* ColumnFamilyData::CompactRange(

 SuperVersion* ColumnFamilyData::GetReferencedSuperVersion(
    InstrumentedMutex* db_mutex) {
-  SuperVersion* sv = GetThreadLocalSuperVersion(db_mutex);
+  SuperVersion* sv = nullptr;
+  sv = GetThreadLocalSuperVersion(db_mutex);
  sv->Ref();
  if (!ReturnThreadLocalSuperVersion(sv)) {
-    // This Unref() corresponds to the Ref() in GetThreadLocalSuperVersion()
-    // when the thread-local pointer was populated. So, the Ref() earlier in
-    // this function still prevents the returned SuperVersion* from being
-    // deleted out from under the caller.
    sv->Unref();
  }
  return sv;
@@ -983,6 +852,7 @@ SuperVersion* ColumnFamilyData::GetReferencedSuperVersion(

 SuperVersion* ColumnFamilyData::GetThreadLocalSuperVersion(
    InstrumentedMutex* db_mutex) {
+  SuperVersion* sv = nullptr;
  // The SuperVersion is cached in thread local storage to avoid acquiring
  // mutex when SuperVersion does not change since the last use. When a new
  // SuperVersion is installed, the compaction or flush thread cleans up
@@ -1001,7 +871,7 @@ SuperVersion* ColumnFamilyData::GetThreadLocalSuperVersion(
  // should only keep kSVInUse before ReturnThreadLocalSuperVersion call
  // (if no Scrape happens).
  assert(ptr != SuperVersion::kSVInUse);
-  SuperVersion* sv = static_cast<SuperVersion*>(ptr);
+  sv = static_cast<SuperVersion*>(ptr);
  if (sv == SuperVersion::kSVObsolete ||
      sv->version_number != super_version_number_.load()) {
    RecordTick(ioptions_.statistics, NUMBER_SUPERVERSION_ACQUIRES);
@@ -1044,16 +914,15 @@ bool ColumnFamilyData::ReturnThreadLocalSuperVersion(SuperVersion* sv) {
  return false;
 }

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

-void ColumnFamilyData::InstallSuperVersion(
-    SuperVersionContext* sv_context, InstrumentedMutex* db_mutex,
+SuperVersion* ColumnFamilyData::InstallSuperVersion(
+    SuperVersion* new_superversion, InstrumentedMutex* db_mutex,
    const MutableCFOptions& mutable_cf_options) {
-  SuperVersion* new_superversion = sv_context->new_superversion.release();
  new_superversion->db_mutex = db_mutex;
  new_superversion->mutable_cf_options = mutable_cf_options;
  new_superversion->Init(mem_, imm_.current(), current_);
@@ -1061,31 +930,16 @@ void ColumnFamilyData::InstallSuperVersion(
  super_version_ = new_superversion;
  ++super_version_number_;
  super_version_->version_number = super_version_number_;
-  super_version_->write_stall_condition =
-      RecalculateWriteStallConditions(mutable_cf_options);
+  // Reset SuperVersions cached in thread local storage
+  ResetThreadLocalSuperVersions();

-  if (old_superversion != nullptr) {
-    // Reset SuperVersions cached in thread local storage.
-    // This should be done before old_superversion->Unref(). That's to ensure
-    // that local_sv_ never holds the last reference to SuperVersion, since
-    // it has no means to safely do SuperVersion cleanup.
-    ResetThreadLocalSuperVersions();
+  RecalculateWriteStallConditions(mutable_cf_options);

-    if (old_superversion->mutable_cf_options.write_buffer_size !=
-        mutable_cf_options.write_buffer_size) {
-      mem_->UpdateWriteBufferSize(mutable_cf_options.write_buffer_size);
-    }
-    if (old_superversion->write_stall_condition !=
-        new_superversion->write_stall_condition) {
-      sv_context->PushWriteStallNotification(
-          old_superversion->write_stall_condition,
-          new_superversion->write_stall_condition, GetName(), ioptions());
-    }
-    if (old_superversion->Unref()) {
-      old_superversion->Cleanup();
-      sv_context->superversions_to_free.push_back(old_superversion);
-    }
+  if (old_superversion != nullptr && old_superversion->Unref()) {
+    old_superversion->Cleanup();
+    return old_superversion;  // will let caller delete outside of mutex
  }
+  return nullptr;
 }

 void ColumnFamilyData::ResetThreadLocalSuperVersions() {
@@ -1097,12 +951,10 @@ void ColumnFamilyData::ResetThreadLocalSuperVersions() {
      continue;
    }
    auto sv = static_cast<SuperVersion*>(ptr);
-    bool was_last_ref __attribute__((__unused__));
-    was_last_ref = sv->Unref();
-    // sv couldn't have been the last reference because
-    // ResetThreadLocalSuperVersions() is called before
-    // unref'ing super_version_.
-    assert(!was_last_ref);
+    if (sv->Unref()) {
+      sv->Cleanup();
+      delete sv;
+    }
  }
 }

@@ -1120,24 +972,6 @@ Status ColumnFamilyData::SetOptions(
 }
 #endif  // ROCKSDB_LITE

-// REQUIRES: DB mutex held
-Env::WriteLifeTimeHint ColumnFamilyData::CalculateSSTWriteHint(int level) {
-  if (initial_cf_options_.compaction_style != kCompactionStyleLevel) {
-    return Env::WLTH_NOT_SET;
-  }
-  if (level == 0) {
-    return Env::WLTH_MEDIUM;
-  }
-  int base_level = current_->storage_info()->base_level();
-
-  // L1: medium, L2: long, ...
-  if (level - base_level >= 2) {
-    return Env::WLTH_EXTREME;
-  }
-  return static_cast<Env::WriteLifeTimeHint>(level - base_level +
-                            static_cast<int>(Env::WLTH_MEDIUM));
-}
-
 ColumnFamilySet::ColumnFamilySet(const std::string& dbname,
                                 const ImmutableDBOptions* db_options,
                                 const EnvOptions& env_options,
@@ -1164,14 +998,10 @@ ColumnFamilySet::~ColumnFamilySet() {
  while (column_family_data_.size() > 0) {
    // cfd destructor will delete itself from column_family_data_
    auto cfd = column_family_data_.begin()->second;
-    bool last_ref __attribute__((__unused__));
-    last_ref = cfd->Unref();
-    assert(last_ref);
+    cfd->Unref();
    delete cfd;
  }
-  bool dummy_last_ref __attribute__((__unused__));
-  dummy_last_ref = dummy_cfd_->Unref();
-  assert(dummy_last_ref);
+  dummy_cfd_->Unref();
  delete dummy_cfd_;
 }

@@ -30,7 +30,6 @@ namespace rocksdb {

 class Version;
 class VersionSet;
-class VersionStorageInfo;
 class MemTable;
 class MemTableListVersion;
 class CompactionPicker;
@@ -42,7 +41,6 @@ class DBImpl;
 class LogBuffer;
 class InstrumentedMutex;
 class InstrumentedMutexLock;
-struct SuperVersionContext;

 extern const double kIncSlowdownRatio;

@@ -78,7 +76,7 @@ class ColumnFamilyHandleImpl : public ColumnFamilyHandle {
 class ColumnFamilyHandleInternal : public ColumnFamilyHandleImpl {
 public:
  ColumnFamilyHandleInternal()
-      : ColumnFamilyHandleImpl(nullptr, nullptr, nullptr), internal_cfd_(nullptr) {}
+      : ColumnFamilyHandleImpl(nullptr, nullptr, nullptr) {}

  void SetCFD(ColumnFamilyData* _cfd) { internal_cfd_ = _cfd; }
  virtual ColumnFamilyData* cfd() const override { return internal_cfd_; }
@@ -97,7 +95,6 @@ struct SuperVersion {
  MutableCFOptions mutable_cf_options;
  // Version number of the current SuperVersion
  uint64_t version_number;
-  WriteStallCondition write_stall_condition;

  InstrumentedMutex* db_mutex;

@@ -195,7 +192,7 @@ class ColumnFamilyData {
  // *) delete all memory associated with that column family
  // *) delete all the files associated with that column family
  void SetDropped();
-  bool IsDropped() const { return dropped_.load(std::memory_order_relaxed); }
+  bool IsDropped() const { return dropped_; }

  // thread-safe
  int NumberLevels() const { return ioptions_.num_levels; }
@@ -203,10 +200,6 @@ class ColumnFamilyData {
  void SetLogNumber(uint64_t log_number) { log_number_ = log_number; }
  uint64_t GetLogNumber() const { return log_number_; }

-  void SetFlushReason(FlushReason flush_reason) {
-    flush_reason_ = flush_reason;
-  }
-  FlushReason GetFlushReason() const { return flush_reason_; }
  // thread-safe
  const EnvOptions* soptions() const;
  const ImmutableCFOptions* ioptions() const { return &ioptions_; }
@@ -244,12 +237,7 @@ class ColumnFamilyData {
  void SetCurrent(Version* _current);
  uint64_t GetNumLiveVersions() const;  // REQUIRE: DB mutex held
  uint64_t GetTotalSstFilesSize() const;  // REQUIRE: DB mutex held
-  uint64_t GetLiveSstFilesSize() const;   // REQUIRE: DB mutex held
-  void SetMemtable(MemTable* new_mem) {
-    uint64_t memtable_id = last_memtable_id_.fetch_add(1) + 1;
-    new_mem->SetID(memtable_id);
-    mem_ = new_mem;
-  }
+  void SetMemtable(MemTable* new_mem) { mem_ = new_mem; }

  // calculate the oldest log needed for the durability of this column family
  uint64_t OldestLogToKeep();
@@ -275,18 +263,8 @@ class ColumnFamilyData {
                                  const Slice& largest_user_key,
                                  int level) const;

-  // Check if the passed ranges overlap with any unflushed memtables
-  // (immutable or mutable).
-  //
-  // @param super_version A referenced SuperVersion that will be held for the
-  //    duration of this function.
-  //
-  // Thread-safe
-  Status RangesOverlapWithMemtables(const autovector<Range>& ranges,
-                                    SuperVersion* super_version, bool* overlap);
-
  // A flag to tell a manual compaction is to compact all levels together
-  // instead of a specific level.
+  // instad of for specific level.
  static const int kCompactAllLevels;
  // A flag to tell a manual compaction's output is base level.
  static const int kCompactToBaseLevel;
@@ -333,11 +311,11 @@ class ColumnFamilyData {
  // As argument takes a pointer to allocated SuperVersion to enable
  // the clients to allocate SuperVersion outside of mutex.
  // IMPORTANT: Only call this from DBImpl::InstallSuperVersion()
-  void InstallSuperVersion(SuperVersionContext* sv_context,
-                           InstrumentedMutex* db_mutex,
-                           const MutableCFOptions& mutable_cf_options);
-  void InstallSuperVersion(SuperVersionContext* sv_context,
-                           InstrumentedMutex* db_mutex);
+  SuperVersion* InstallSuperVersion(SuperVersion* new_superversion,
+                                    InstrumentedMutex* db_mutex,
+                                    const MutableCFOptions& mutable_cf_options);
+  SuperVersion* InstallSuperVersion(SuperVersion* new_superversion,
+                                    InstrumentedMutex* db_mutex);

  void ResetThreadLocalSuperVersions();

@@ -347,35 +325,18 @@ class ColumnFamilyData {
  bool pending_flush() { return pending_flush_; }
  bool pending_compaction() { return pending_compaction_; }

-  enum class WriteStallCause {
-    kNone,
-    kMemtableLimit,
-    kL0FileCountLimit,
-    kPendingCompactionBytes,
-  };
-  static std::pair<WriteStallCondition, WriteStallCause>
-  GetWriteStallConditionAndCause(int num_unflushed_memtables, int num_l0_files,
-                                 uint64_t num_compaction_needed_bytes,
-                                 const MutableCFOptions& mutable_cf_options);
-
  // Recalculate some small conditions, which are changed only during
  // compaction, adding new memtable and/or
  // recalculation of compaction score. These values are used in
  // DBImpl::MakeRoomForWrite function to decide, if it need to make
  // a write stall
-  WriteStallCondition RecalculateWriteStallConditions(
+  void RecalculateWriteStallConditions(
      const MutableCFOptions& mutable_cf_options);

  void set_initialized() { initialized_.store(true); }

  bool initialized() const { return initialized_.load(); }

-  const ColumnFamilyOptions& initial_cf_options() {
-    return initial_cf_options_;
-  }
-
-  Env::WriteLifeTimeHint CalculateSSTWriteHint(int level);
-
 private:
  friend class ColumnFamilySet;
  ColumnFamilyData(uint32_t id, const std::string& name,
@@ -393,7 +354,7 @@ class ColumnFamilyData {

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

  const InternalKeyComparator internal_comparator_;
  std::vector<std::unique_ptr<IntTblPropCollectorFactory>>
@@ -435,8 +396,6 @@ class ColumnFamilyData {
  // recovered from
  uint64_t log_number_;

-  std::atomic<FlushReason> flush_reason_;
-
  // An object that keeps all the compaction stats
  // and picks the next compaction
  std::unique_ptr<CompactionPicker> compaction_picker_;
@@ -456,9 +415,6 @@ class ColumnFamilyData {

  // if the database was opened with 2pc enabled
  bool allow_2pc_;
-
-  // Memtable id to track flush.
-  std::atomic<uint64_t> last_memtable_id_;
 };

 // ColumnFamilySet has interesting thread-safety requirements
@@ -302,7 +302,6 @@ class ColumnFamilyTest : public testing::Test {
        ASSERT_OK(Put(cf, key, RandomString(&rnd_, key_value_size - 10)));
      }
    }
-    db_->FlushWAL(false);
  }

 #ifndef ROCKSDB_LITE  // TEST functions in DB are not supported in lite
@@ -582,7 +581,6 @@ TEST_P(FlushEmptyCFTestWithParam, FlushEmptyCFTest) {
  Flush(0);
  ASSERT_OK(Put(1, "bar", "v3"));  // seqID 4
  ASSERT_OK(Put(1, "foo", "v4"));  // seqID 5
-  db_->FlushWAL(false);

  // Preserve file system state up to here to simulate a crash condition.
  fault_env->SetFilesystemActive(false);
@@ -645,7 +643,6 @@ TEST_P(FlushEmptyCFTestWithParam, FlushEmptyCFTest2) {
  // Write to log file D
  ASSERT_OK(Put(1, "bar", "v4"));  // seqID 7
  ASSERT_OK(Put(1, "bar", "v5"));  // seqID 8
-  db_->FlushWAL(false);
  // Preserve file system state up to here to simulate a crash condition.
  fault_env->SetFilesystemActive(false);
  std::vector<std::string> names;
@@ -933,62 +930,62 @@ TEST_F(ColumnFamilyTest, FlushTest) {
 TEST_F(ColumnFamilyTest, LogDeletionTest) {
  db_options_.max_total_wal_size = std::numeric_limits<uint64_t>::max();
  column_family_options_.arena_block_size = 4 * 1024;
-  column_family_options_.write_buffer_size = 128000;  // 128KB
+  column_family_options_.write_buffer_size = 100000;  // 100KB
  Open();
  CreateColumnFamilies({"one", "two", "three", "four"});
  // Each bracket is one log file. if number is in (), it means
  // we don't need it anymore (it's been flushed)
  // []
  AssertCountLiveLogFiles(0);
-  PutRandomData(0, 1, 128);
+  PutRandomData(0, 1, 100);
  // [0]
-  PutRandomData(1, 1, 128);
+  PutRandomData(1, 1, 100);
  // [0, 1]
-  PutRandomData(1, 1000, 128);
+  PutRandomData(1, 1000, 100);
  WaitForFlush(1);
  // [0, (1)] [1]
  AssertCountLiveLogFiles(2);
-  PutRandomData(0, 1, 128);
+  PutRandomData(0, 1, 100);
  // [0, (1)] [0, 1]
  AssertCountLiveLogFiles(2);
-  PutRandomData(2, 1, 128);
+  PutRandomData(2, 1, 100);
  // [0, (1)] [0, 1, 2]
-  PutRandomData(2, 1000, 128);
+  PutRandomData(2, 1000, 100);
  WaitForFlush(2);
  // [0, (1)] [0, 1, (2)] [2]
  AssertCountLiveLogFiles(3);
-  PutRandomData(2, 1000, 128);
+  PutRandomData(2, 1000, 100);
  WaitForFlush(2);
  // [0, (1)] [0, 1, (2)] [(2)] [2]
  AssertCountLiveLogFiles(4);
-  PutRandomData(3, 1, 128);
+  PutRandomData(3, 1, 100);
  // [0, (1)] [0, 1, (2)] [(2)] [2, 3]
-  PutRandomData(1, 1, 128);
+  PutRandomData(1, 1, 100);
  // [0, (1)] [0, 1, (2)] [(2)] [1, 2, 3]
  AssertCountLiveLogFiles(4);
-  PutRandomData(1, 1000, 128);
+  PutRandomData(1, 1000, 100);
  WaitForFlush(1);
  // [0, (1)] [0, (1), (2)] [(2)] [(1), 2, 3] [1]
  AssertCountLiveLogFiles(5);
-  PutRandomData(0, 1000, 128);
+  PutRandomData(0, 1000, 100);
  WaitForFlush(0);
  // [(0), (1)] [(0), (1), (2)] [(2)] [(1), 2, 3] [1, (0)] [0]
  // delete obsolete logs -->
  // [(1), 2, 3] [1, (0)] [0]
  AssertCountLiveLogFiles(3);
-  PutRandomData(0, 1000, 128);
+  PutRandomData(0, 1000, 100);
  WaitForFlush(0);
  // [(1), 2, 3] [1, (0)], [(0)] [0]
  AssertCountLiveLogFiles(4);
-  PutRandomData(1, 1000, 128);
+  PutRandomData(1, 1000, 100);
  WaitForFlush(1);
  // [(1), 2, 3] [(1), (0)] [(0)] [0, (1)] [1]
  AssertCountLiveLogFiles(5);
-  PutRandomData(2, 1000, 128);
+  PutRandomData(2, 1000, 100);
  WaitForFlush(2);
  // [(1), (2), 3] [(1), (0)] [(0)] [0, (1)] [1, (2)], [2]
  AssertCountLiveLogFiles(6);
-  PutRandomData(3, 1000, 128);
+  PutRandomData(3, 1000, 100);
  WaitForFlush(3);
  // [(1), (2), (3)] [(1), (0)] [(0)] [0, (1)] [1, (2)], [2, (3)] [3]
  // delete obsolete logs -->
@@ -1168,14 +1165,13 @@ TEST_F(ColumnFamilyTest, MemtableNotSupportSnapshot) {
 #endif  // !ROCKSDB_LITE

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

 static TestComparator third_comparator;
@@ -1869,6 +1865,126 @@ TEST_F(ColumnFamilyTest, SameCFManualAutomaticCompactionsLevel) {
  }
 }

+// This test checks for automatic getting a conflict if there is a
+// manual which has not yet been scheduled.
+// The manual compaction waits in NotScheduled
+// We generate more files and then trigger an automatic compaction
+// This will wait because there is an unscheduled manual compaction.
+// Once the conflict is hit, the manual compaction starts and ends
+// Then another automatic will start and end.
+TEST_F(ColumnFamilyTest, SameCFManualAutomaticConflict) {
+  Open();
+  CreateColumnFamilies({"one"});
+  ColumnFamilyOptions default_cf, one;
+  db_options_.max_open_files = 20;  // only 10 files in file cache
+  db_options_.max_background_compactions = 3;
+
+  default_cf.compaction_style = kCompactionStyleLevel;
+  default_cf.num_levels = 3;
+  default_cf.write_buffer_size = 64 << 10;  // 64KB
+  default_cf.target_file_size_base = 30 << 10;
+  default_cf.max_compaction_bytes = default_cf.target_file_size_base * 1100;
+  BlockBasedTableOptions table_options;
+  table_options.no_block_cache = true;
+  default_cf.table_factory.reset(NewBlockBasedTableFactory(table_options));
+
+  one.compaction_style = kCompactionStyleUniversal;
+
+  one.num_levels = 1;
+  // trigger compaction if there are >= 4 files
+  one.level0_file_num_compaction_trigger = 4;
+  one.write_buffer_size = 120000;
+
+  Reopen({default_cf, one});
+  // make sure all background compaction jobs can be scheduled
+  auto stop_token =
+      dbfull()->TEST_write_controler().GetCompactionPressureToken();
+
+  // SETUP column family "one" -- universal style
+  for (int i = 0; i < one.level0_file_num_compaction_trigger - 2; ++i) {
+    PutRandomData(1, 10, 12000, true);
+    PutRandomData(1, 1, 10, true);
+    WaitForFlush(1);
+    AssertFilesPerLevel(ToString(i + 1), 1);
+  }
+  bool cf_1_1 = true;
+  bool cf_1_2 = true;
+  rocksdb::SyncPoint::GetInstance()->LoadDependency(
+      {{"DBImpl::BackgroundCompaction()::Conflict",
+        "ColumnFamilyTest::ManualAutoCon:7"},
+       {"ColumnFamilyTest::ManualAutoCon:9",
+        "ColumnFamilyTest::ManualAutoCon:8"},
+       {"ColumnFamilyTest::ManualAutoCon:2",
+        "ColumnFamilyTest::ManualAutoCon:6"},
+       {"ColumnFamilyTest::ManualAutoCon:4",
+        "ColumnFamilyTest::ManualAutoCon:5"},
+       {"ColumnFamilyTest::ManualAutoCon:1",
+        "ColumnFamilyTest::ManualAutoCon:2"},
+       {"ColumnFamilyTest::ManualAutoCon:1",
+        "ColumnFamilyTest::ManualAutoCon:3"}});
+  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::BackgroundCompaction:NonTrivial:AfterRun", [&](void* arg) {
+        if (cf_1_1) {
+          TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:4");
+          cf_1_1 = false;
+          TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:3");
+        } else if (cf_1_2) {
+          cf_1_2 = false;
+          TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:2");
+        }
+      });
+  rocksdb::SyncPoint::GetInstance()->SetCallBack(
+      "DBImpl::RunManualCompaction:NotScheduled", [&](void* arg) {
+        InstrumentedMutex* mutex = static_cast<InstrumentedMutex*>(arg);
+        mutex->Unlock();
+        TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:9");
+        TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:7");
+        mutex->Lock();
+      });
+
+  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
+  rocksdb::port::Thread threads([&] {
+    CompactRangeOptions compact_options;
+    compact_options.exclusive_manual_compaction = false;
+    ASSERT_OK(
+        db_->CompactRange(compact_options, handles_[1], nullptr, nullptr));
+    TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:6");
+  });
+
+  TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:8");
+  WaitForFlush(1);
+
+  // Add more L0 files and force automatic compaction
+  for (int i = 0; i < one.level0_file_num_compaction_trigger; ++i) {
+    PutRandomData(1, 10, 12000, true);
+    PutRandomData(1, 1, 10, true);
+    WaitForFlush(1);
+    AssertFilesPerLevel(ToString(one.level0_file_num_compaction_trigger + i),
+                        1);
+  }
+
+  TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:5");
+  // Add more L0 files and force automatic compaction
+  for (int i = 0; i < one.level0_file_num_compaction_trigger; ++i) {
+    PutRandomData(1, 10, 12000, true);
+    PutRandomData(1, 1, 10, true);
+    WaitForFlush(1);
+  }
+  TEST_SYNC_POINT("ColumnFamilyTest::ManualAutoCon:1");
+
+  threads.join();
+  WaitForCompaction();
+  // VERIFY compaction "one"
+  ASSERT_LE(NumTableFilesAtLevel(0, 1), 3);
+
+  // Compare against saved keys
+  std::set<std::string>::iterator key_iter = keys_.begin();
+  while (key_iter != keys_.end()) {
+    ASSERT_NE("NOT_FOUND", Get(1, *key_iter));
+    key_iter++;
+  }
+}
+
 // In this test, we generate enough files to trigger automatic compactions.
 // The automatic compaction waits in NonTrivial:AfterRun
 // We generate more files and then trigger an automatic compaction
@@ -2791,18 +2907,6 @@ TEST_F(ColumnFamilyTest, CompactionSpeedupTwoColumnFamilies) {
  ASSERT_EQ(1, dbfull()->TEST_BGCompactionsAllowed());
 }

-TEST_F(ColumnFamilyTest, CreateAndDestoryOptions) {
-  std::unique_ptr<ColumnFamilyOptions> cfo(new ColumnFamilyOptions());
-  ColumnFamilyHandle* cfh;
-  Open();
-  ASSERT_OK(db_->CreateColumnFamily(*(cfo.get()), "yoyo", &cfh));
-  cfo.reset();
-  ASSERT_OK(db_->Put(WriteOptions(), cfh, "foo", "bar"));
-  ASSERT_OK(db_->Flush(FlushOptions(), cfh));
-  ASSERT_OK(db_->DropColumnFamily(cfh));
-  ASSERT_OK(db_->DestroyColumnFamilyHandle(cfh));
-}
-
 #ifndef ROCKSDB_LITE
 TEST_F(ColumnFamilyTest, FlushCloseWALFiles) {
  SpecialEnv env(Env::Default());
@@ -37,7 +37,8 @@ class FlushedFileCollector : public EventListener {
  FlushedFileCollector() {}
  ~FlushedFileCollector() {}

-  virtual void OnFlushCompleted(DB* /*db*/, const FlushJobInfo& info) override {
+  virtual void OnFlushCompleted(
+      DB* db, const FlushJobInfo& info) override {
    std::lock_guard<std::mutex> lock(mutex_);
    flushed_files_.push_back(info.file_path);
  }
@@ -256,9 +257,9 @@ TEST_F(CompactFilesTest, CapturingPendingFiles) {
 TEST_F(CompactFilesTest, CompactionFilterWithGetSv) {
  class FilterWithGet : public CompactionFilter {
   public:
-    virtual bool Filter(int /*level*/, const Slice& /*key*/,
-                        const Slice& /*value*/, std::string* /*new_value*/,
-                        bool* /*value_changed*/) const override {
+    virtual bool Filter(int level, const Slice& key, const Slice& value,
+                        std::string* new_value,
+                        bool* value_changed) const override {
      if (db_ == nullptr) {
        return true;
      }
@@ -17,8 +17,7 @@ extern bool SaveValue(void* arg, const ParsedInternalKey& parsed_key,

 CompactedDBImpl::CompactedDBImpl(
  const DBOptions& options, const std::string& dbname)
-  : DBImpl(options, dbname), cfd_(nullptr), version_(nullptr),
-    user_comparator_(nullptr) {
+  : DBImpl(options, dbname) {
 }

 CompactedDBImpl::~CompactedDBImpl() {
@@ -94,7 +93,6 @@ std::vector<Status> CompactedDBImpl::MultiGet(const ReadOptions& options,
 }

 Status CompactedDBImpl::Init(const Options& options) {
-  SuperVersionContext sv_context(/* create_superversion */ true);
  mutex_.Lock();
  ColumnFamilyDescriptor cf(kDefaultColumnFamilyName,
                            ColumnFamilyOptions(options));
@@ -102,10 +100,9 @@ Status CompactedDBImpl::Init(const Options& options) {
  if (s.ok()) {
    cfd_ = reinterpret_cast<ColumnFamilyHandleImpl*>(
              DefaultColumnFamily())->cfd();
-    cfd_->InstallSuperVersion(&sv_context, &mutex_);
+    delete cfd_->InstallSuperVersion(new SuperVersion(), &mutex_);
  }
  mutex_.Unlock();
-  sv_context.Clean();
  if (!s.ok()) {
    return s;
  }
@@ -32,56 +32,55 @@ class CompactedDBImpl : public DBImpl {
    override;

  using DBImpl::Put;
-  virtual Status Put(const WriteOptions& /*options*/,
-                     ColumnFamilyHandle* /*column_family*/,
-                     const Slice& /*key*/, const Slice& /*value*/) override {
+  virtual Status Put(const WriteOptions& options,
+                     ColumnFamilyHandle* column_family, const Slice& key,
+                     const Slice& value) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
  using DBImpl::Merge;
-  virtual Status Merge(const WriteOptions& /*options*/,
-                       ColumnFamilyHandle* /*column_family*/,
-                       const Slice& /*key*/, const Slice& /*value*/) override {
+  virtual Status Merge(const WriteOptions& options,
+                       ColumnFamilyHandle* column_family, const Slice& key,
+                       const Slice& value) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
  using DBImpl::Delete;
-  virtual Status Delete(const WriteOptions& /*options*/,
-                        ColumnFamilyHandle* /*column_family*/,
-                        const Slice& /*key*/) override {
+  virtual Status Delete(const WriteOptions& options,
+                        ColumnFamilyHandle* column_family,
+                        const Slice& key) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
-  virtual Status Write(const WriteOptions& /*options*/,
-                       WriteBatch* /*updates*/) override {
+  virtual Status Write(const WriteOptions& options,
+                       WriteBatch* updates) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
  using DBImpl::CompactRange;
-  virtual Status CompactRange(const CompactRangeOptions& /*options*/,
-                              ColumnFamilyHandle* /*column_family*/,
-                              const Slice* /*begin*/,
-                              const Slice* /*end*/) override {
+  virtual Status CompactRange(const CompactRangeOptions& options,
+                              ColumnFamilyHandle* column_family,
+                              const Slice* begin, const Slice* end) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }

  virtual Status DisableFileDeletions() override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
-  virtual Status EnableFileDeletions(bool /*force*/) override {
+  virtual Status EnableFileDeletions(bool force) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
  virtual Status GetLiveFiles(std::vector<std::string>&,
-                              uint64_t* /*manifest_file_size*/,
-                              bool /*flush_memtable*/ = true) override {
+                              uint64_t* manifest_file_size,
+                              bool flush_memtable = true) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
  using DBImpl::Flush;
-  virtual Status Flush(const FlushOptions& /*options*/,
-                       ColumnFamilyHandle* /*column_family*/) override {
+  virtual Status Flush(const FlushOptions& options,
+                       ColumnFamilyHandle* column_family) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
  using DB::IngestExternalFile;
  virtual Status IngestExternalFile(
-      ColumnFamilyHandle* /*column_family*/,
-      const std::vector<std::string>& /*external_files*/,
-      const IngestExternalFileOptions& /*ingestion_options*/) override {
+      ColumnFamilyHandle* column_family,
+      const std::vector<std::string>& external_files,
+      const IngestExternalFileOptions& ingestion_options) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }

@@ -86,23 +86,35 @@ void Compaction::GetBoundaryKeys(
 bool Compaction::IsBottommostLevel(
    int output_level, VersionStorageInfo* vstorage,
    const std::vector<CompactionInputFiles>& inputs) {
-  int output_l0_idx;
-  if (output_level == 0) {
-    output_l0_idx = 0;
-    for (const auto* file : vstorage->LevelFiles(0)) {
-      if (inputs[0].files.back() == file) {
-        break;
-      }
-      ++output_l0_idx;
-    }
-    assert(static_cast<size_t>(output_l0_idx) < vstorage->LevelFiles(0).size());
-  } else {
-    output_l0_idx = -1;
+  if (inputs[0].level == 0 &&
+      inputs[0].files.back() != vstorage->LevelFiles(0).back()) {
+    return false;
  }
+
  Slice smallest_key, largest_key;
  GetBoundaryKeys(vstorage, inputs, &smallest_key, &largest_key);
-  return !vstorage->RangeMightExistAfterSortedRun(smallest_key, largest_key,
-                                                  output_level, output_l0_idx);
+
+  // Checks whether there are files living beyond the output_level.
+  // If lower levels have files, it checks for overlap between files
+  // if the compaction process and those files.
+  // Bottomlevel optimizations can be made if there are no files in
+  // lower levels or if there is no overlap with the files in
+  // the lower levels.
+  for (int i = output_level + 1; i < vstorage->num_levels(); i++) {
+    // It is not the bottommost level if there are files in higher
+    // levels when the output level is 0 or if there are files in
+    // higher levels which overlap with files to be compacted.
+    // output_level == 0 means that we want it to be considered
+    // s the bottommost level only if the last file on the level
+    // is a part of the files to be compacted - this is verified by
+    // the first if condition in this function
+    if (vstorage->NumLevelFiles(i) > 0 &&
+        (output_level == 0 ||
+         vstorage->OverlapInLevel(i, &smallest_key, &largest_key))) {
+      return false;
+    }
+  }
+  return true;
 }

 // test function to validate the functionality of IsBottommostLevel()
@@ -157,7 +169,6 @@ Compaction::Compaction(VersionStorageInfo* vstorage,
      bottommost_level_(IsBottommostLevel(output_level_, vstorage, inputs_)),
      is_full_compaction_(IsFullCompaction(vstorage, inputs_)),
      is_manual_compaction_(_manual_compaction),
-      is_trivial_move_(false),
      compaction_reason_(_compaction_reason) {
  MarkFilesBeingCompacted(true);
  if (is_manual_compaction_) {
@@ -229,7 +240,7 @@ bool Compaction::IsTrivialMove() const {

  // Used in universal compaction, where trivial move can be done if the
  // input files are non overlapping
-  if ((mutable_cf_options_.compaction_options_universal.allow_trivial_move) &&
+  if ((immutable_cf_options_.compaction_options_universal.allow_trivial_move) &&
      (output_level_ != 0)) {
    return is_trivial_move_;
  }
@@ -272,31 +283,32 @@ bool Compaction::KeyNotExistsBeyondOutputLevel(
  assert(input_version_ != nullptr);
  assert(level_ptrs != nullptr);
  assert(level_ptrs->size() == static_cast<size_t>(number_levels_));
-  if (bottommost_level_) {
-    return true;
-  } else if (output_level_ != 0 &&
-             cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
-    // Maybe use binary search to find right entry instead of linear search?
-    const Comparator* user_cmp = cfd_->user_comparator();
-    for (int lvl = output_level_ + 1; lvl < number_levels_; lvl++) {
-      const std::vector<FileMetaData*>& files =
-          input_vstorage_->LevelFiles(lvl);
-      for (; level_ptrs->at(lvl) < files.size(); level_ptrs->at(lvl)++) {
-        auto* f = files[level_ptrs->at(lvl)];
-        if (user_cmp->Compare(user_key, f->largest.user_key()) <= 0) {
-          // We've advanced far enough
-          if (user_cmp->Compare(user_key, f->smallest.user_key()) >= 0) {
-            // Key falls in this file's range, so definitely
-            // exists beyond output level
-            return false;
-          }
-          break;
+  assert(cfd_->ioptions()->compaction_style != kCompactionStyleFIFO);
+  if (cfd_->ioptions()->compaction_style == kCompactionStyleUniversal) {
+    return bottommost_level_;
+  }
+  if (cfd_->ioptions()->compaction_style == kCompactionStyleLevel &&
+      output_level_ == 0) {
+    return false;
+  }
+  // Maybe use binary search to find right entry instead of linear search?
+  const Comparator* user_cmp = cfd_->user_comparator();
+  for (int lvl = output_level_ + 1; lvl < number_levels_; lvl++) {
+    const std::vector<FileMetaData*>& files = input_vstorage_->LevelFiles(lvl);
+    for (; level_ptrs->at(lvl) < files.size(); level_ptrs->at(lvl)++) {
+      auto* f = files[level_ptrs->at(lvl)];
+      if (user_cmp->Compare(user_key, f->largest.user_key()) <= 0) {
+        // We've advanced far enough
+        if (user_cmp->Compare(user_key, f->smallest.user_key()) >= 0) {
+          // Key falls in this file's range, so definitely
+          // exists beyond output level
+          return false;
        }
+        break;
      }
    }
-    return true;
  }
-  return false;
+  return true;
 }

 // Mark (or clear) each file that is being compacted
@@ -405,23 +417,20 @@ void Compaction::Summary(char* output, int len) {
 uint64_t Compaction::OutputFilePreallocationSize() const {
  uint64_t preallocation_size = 0;

-  for (const auto& level_files : inputs_) {
-    for (const auto& file : level_files.files) {
-      preallocation_size += file->fd.GetFileSize();
+  if (max_output_file_size_ != port::kMaxUint64 &&
+      (cfd_->ioptions()->compaction_style == kCompactionStyleLevel ||
+       output_level() > 0)) {
+    preallocation_size = max_output_file_size_;
+  } else {
+    for (const auto& level_files : inputs_) {
+      for (const auto& file : level_files.files) {
+        preallocation_size += file->fd.GetFileSize();
+      }
    }
  }
-
-  if (max_output_file_size_ != port::kMaxUint64 &&
-      (immutable_cf_options_.compaction_style == kCompactionStyleLevel ||
-       output_level() > 0)) {
-    preallocation_size = std::min(max_output_file_size_, preallocation_size);
-  }
-
  // Over-estimate slightly so we don't end up just barely crossing
  // the threshold
-  // No point to prellocate more than 1GB.
-  return std::min(uint64_t{1073741824},
-                  preallocation_size + (preallocation_size / 10));
+  return preallocation_size + (preallocation_size / 10);
 }

 std::unique_ptr<CompactionFilter> Compaction::CreateCompactionFilter() const {
@@ -446,8 +455,7 @@ bool Compaction::ShouldFormSubcompactions() const {
    return false;
  }
  if (cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
-    return (start_level_ == 0 || is_manual_compaction_) && output_level_ > 0 &&
-           !IsOutputLevelEmpty();
+    return start_level_ == 0 && output_level_ > 0 && !IsOutputLevelEmpty();
  } else if (cfd_->ioptions()->compaction_style == kCompactionStyleUniversal) {
    return number_levels_ > 1 && output_level_ > 0;
  } else {
@@ -455,17 +463,4 @@ bool Compaction::ShouldFormSubcompactions() const {
  }
 }

-uint64_t Compaction::MaxInputFileCreationTime() const {
-  uint64_t max_creation_time = 0;
-  for (const auto& file : inputs_[0].files) {
-    if (file->fd.table_reader != nullptr &&
-        file->fd.table_reader->GetTableProperties() != nullptr) {
-      uint64_t creation_time =
-          file->fd.table_reader->GetTableProperties()->creation_time;
-      max_creation_time = std::max(max_creation_time, creation_time);
-    }
-  }
-  return max_creation_time;
-}
-
 }  // namespace rocksdb
@@ -99,8 +99,7 @@ class Compaction {
  // input level.
  // REQUIREMENT: "compaction_input_level" must be >= 0 and
  //              < "input_levels()"
-  const std::vector<FileMetaData*>* inputs(
-      size_t compaction_input_level) const {
+  const std::vector<FileMetaData*>* inputs(size_t compaction_input_level) {
    assert(compaction_input_level < inputs_.size());
    return &inputs_[compaction_input_level].files;
  }
@@ -241,8 +240,6 @@ class Compaction {

  uint64_t max_compaction_bytes() const { return max_compaction_bytes_; }

-  uint64_t MaxInputFileCreationTime() const;
-
 private:
  // mark (or clear) all files that are being compacted
  void MarkFilesBeingCompacted(bool mark_as_compacted);
@@ -16,8 +16,6 @@ struct CompactionIterationStats {
  int64_t num_record_drop_obsolete = 0;
  int64_t num_record_drop_range_del = 0;
  int64_t num_range_del_drop_obsolete = 0;
-  // Deletions obsoleted before bottom level due to file gap optimization.
-  int64_t num_optimized_del_drop_obsolete = 0;
  uint64_t total_filter_time = 0;

  // Input statistics
@@ -4,59 +4,75 @@
 //  (found in the LICENSE.Apache file in the root directory).

 #include "db/compaction_iterator.h"
-
-#include "db/snapshot_checker.h"
-#include "port/likely.h"
 #include "rocksdb/listener.h"
 #include "table/internal_iterator.h"

 namespace rocksdb {

-CompactionIterator::CompactionIterator(
-    InternalIterator* input, const Comparator* cmp, MergeHelper* merge_helper,
-    SequenceNumber last_sequence, std::vector<SequenceNumber>* snapshots,
-    SequenceNumber earliest_write_conflict_snapshot,
-    const SnapshotChecker* snapshot_checker, Env* env,
-    bool expect_valid_internal_key, RangeDelAggregator* range_del_agg,
-    const Compaction* compaction, const CompactionFilter* compaction_filter,
-    const std::atomic<bool>* shutting_down,
-    const SequenceNumber preserve_deletes_seqnum)
-    : CompactionIterator(
-          input, cmp, merge_helper, last_sequence, snapshots,
-          earliest_write_conflict_snapshot, snapshot_checker, env,
-          expect_valid_internal_key, range_del_agg,
-          std::unique_ptr<CompactionProxy>(
-              compaction ? new CompactionProxy(compaction) : nullptr),
-          compaction_filter, shutting_down, preserve_deletes_seqnum) {}
+#ifndef ROCKSDB_LITE
+CompactionEventListener::CompactionListenerValueType fromInternalValueType(
+    ValueType vt) {
+  switch (vt) {
+    case kTypeDeletion:
+      return CompactionEventListener::CompactionListenerValueType::kDelete;
+    case kTypeValue:
+      return CompactionEventListener::CompactionListenerValueType::kValue;
+    case kTypeMerge:
+      return CompactionEventListener::CompactionListenerValueType::
+          kMergeOperand;
+    case kTypeSingleDeletion:
+      return CompactionEventListener::CompactionListenerValueType::
+          kSingleDelete;
+    case kTypeRangeDeletion:
+      return CompactionEventListener::CompactionListenerValueType::kRangeDelete;
+    default:
+      assert(false);
+      return CompactionEventListener::CompactionListenerValueType::kInvalid;
+  }
+}
+#endif  // ROCKSDB_LITE

 CompactionIterator::CompactionIterator(
    InternalIterator* input, const Comparator* cmp, MergeHelper* merge_helper,
-    SequenceNumber /*last_sequence*/, std::vector<SequenceNumber>* snapshots,
-    SequenceNumber earliest_write_conflict_snapshot,
-    const SnapshotChecker* snapshot_checker, Env* env,
+    SequenceNumber last_sequence, std::vector<SequenceNumber>* snapshots,
+    SequenceNumber earliest_write_conflict_snapshot, Env* env,
+    bool expect_valid_internal_key, RangeDelAggregator* range_del_agg,
+    const Compaction* compaction, const CompactionFilter* compaction_filter,
+    CompactionEventListener* compaction_listener,
+    const std::atomic<bool>* shutting_down)
+    : CompactionIterator(
+          input, cmp, merge_helper, last_sequence, snapshots,
+          earliest_write_conflict_snapshot, env, expect_valid_internal_key,
+          range_del_agg,
+          std::unique_ptr<CompactionProxy>(
+              compaction ? new CompactionProxy(compaction) : nullptr),
+          compaction_filter, compaction_listener, shutting_down) {}
+
+CompactionIterator::CompactionIterator(
+    InternalIterator* input, const Comparator* cmp, MergeHelper* merge_helper,
+    SequenceNumber last_sequence, std::vector<SequenceNumber>* snapshots,
+    SequenceNumber earliest_write_conflict_snapshot, Env* env,
    bool expect_valid_internal_key, RangeDelAggregator* range_del_agg,
    std::unique_ptr<CompactionProxy> compaction,
    const CompactionFilter* compaction_filter,
-    const std::atomic<bool>* shutting_down,
-    const SequenceNumber preserve_deletes_seqnum)
+    CompactionEventListener* compaction_listener,
+    const std::atomic<bool>* shutting_down)
    : input_(input),
      cmp_(cmp),
      merge_helper_(merge_helper),
      snapshots_(snapshots),
      earliest_write_conflict_snapshot_(earliest_write_conflict_snapshot),
-      snapshot_checker_(snapshot_checker),
      env_(env),
      expect_valid_internal_key_(expect_valid_internal_key),
      range_del_agg_(range_del_agg),
      compaction_(std::move(compaction)),
      compaction_filter_(compaction_filter),
+#ifndef ROCKSDB_LITE
+      compaction_listener_(compaction_listener),
+#endif  // ROCKSDB_LITE
      shutting_down_(shutting_down),
-      preserve_deletes_seqnum_(preserve_deletes_seqnum),
      ignore_snapshots_(false),
-      current_user_key_sequence_(0),
-      current_user_key_snapshot_(0),
-      merge_out_iter_(merge_helper_),
-      current_key_committed_(false) {
+      merge_out_iter_(merge_helper_) {
  assert(compaction_filter_ == nullptr || compaction_ != nullptr);
  bottommost_level_ =
      compaction_ == nullptr ? false : compaction_->bottommost_level();
@@ -95,7 +111,6 @@ void CompactionIterator::ResetRecordCounts() {
  iter_stats_.num_record_drop_obsolete = 0;
  iter_stats_.num_record_drop_range_del = 0;
  iter_stats_.num_range_del_drop_obsolete = 0;
-  iter_stats_.num_optimized_del_drop_obsolete = 0;
 }

 void CompactionIterator::SeekToFirst() {
@@ -113,8 +128,8 @@ void CompactionIterator::Next() {
    if (merge_out_iter_.Valid()) {
      key_ = merge_out_iter_.key();
      value_ = merge_out_iter_.value();
-      bool valid_key __attribute__((__unused__));
-      valid_key =  ParseInternalKey(key_, &ikey_);
+      bool valid_key __attribute__((__unused__)) =
+          ParseInternalKey(key_, &ikey_);
      // MergeUntil stops when it encounters a corrupt key and does not
      // include them in the result, so we expect the keys here to be valid.
      assert(valid_key);
@@ -148,64 +163,6 @@ void CompactionIterator::Next() {
  PrepareOutput();
 }

-void CompactionIterator::InvokeFilterIfNeeded(bool* need_skip,
-                                              Slice* skip_until) {
-  if (compaction_filter_ != nullptr &&
-      (ikey_.type == kTypeValue || ikey_.type == kTypeBlobIndex) &&
-      (visible_at_tip_ || ignore_snapshots_ ||
-       ikey_.sequence > latest_snapshot_ ||
-       (snapshot_checker_ != nullptr &&
-        UNLIKELY(!snapshot_checker_->IsInSnapshot(ikey_.sequence,
-                                                  latest_snapshot_))))) {
-    // If the user has specified a compaction filter and the sequence
-    // number is greater than any external snapshot, then invoke the
-    // filter. If the return value of the compaction filter is true,
-    // replace the entry with a deletion marker.
-    CompactionFilter::Decision filter;
-    compaction_filter_value_.clear();
-    compaction_filter_skip_until_.Clear();
-    CompactionFilter::ValueType value_type =
-        ikey_.type == kTypeValue ? CompactionFilter::ValueType::kValue
-                                 : CompactionFilter::ValueType::kBlobIndex;
-    // Hack: pass internal key to BlobIndexCompactionFilter since it needs
-    // to get sequence number.
-    Slice& filter_key = ikey_.type == kTypeValue ? ikey_.user_key : key_;
-    {
-      StopWatchNano timer(env_, true);
-      filter = compaction_filter_->FilterV2(
-          compaction_->level(), filter_key, value_type, value_,
-          &compaction_filter_value_, compaction_filter_skip_until_.rep());
-      iter_stats_.total_filter_time +=
-          env_ != nullptr ? timer.ElapsedNanos() : 0;
-    }
-
-    if (filter == CompactionFilter::Decision::kRemoveAndSkipUntil &&
-        cmp_->Compare(*compaction_filter_skip_until_.rep(), ikey_.user_key) <=
-            0) {
-      // Can't skip to a key smaller than the current one.
-      // Keep the key as per FilterV2 documentation.
-      filter = CompactionFilter::Decision::kKeep;
-    }
-
-    if (filter == CompactionFilter::Decision::kRemove) {
-      // convert the current key to a delete; key_ is pointing into
-      // current_key_ at this point, so updating current_key_ updates key()
-      ikey_.type = kTypeDeletion;
-      current_key_.UpdateInternalKey(ikey_.sequence, kTypeDeletion);
-      // no value associated with delete
-      value_.clear();
-      iter_stats_.num_record_drop_user++;
-    } else if (filter == CompactionFilter::Decision::kChangeValue) {
-      value_ = compaction_filter_value_;
-    } else if (filter == CompactionFilter::Decision::kRemoveAndSkipUntil) {
-      *need_skip = true;
-      compaction_filter_skip_until_.ConvertFromUserKey(kMaxSequenceNumber,
-                                                       kValueTypeForSeek);
-      *skip_until = compaction_filter_skip_until_.Encode();
-    }
-  }
-}
-
 void CompactionIterator::NextFromInput() {
  at_next_ = false;
  valid_ = false;
@@ -260,16 +217,70 @@ void CompactionIterator::NextFromInput() {
      has_outputted_key_ = false;
      current_user_key_sequence_ = kMaxSequenceNumber;
      current_user_key_snapshot_ = 0;
-      current_key_committed_ =
-          (snapshot_checker_ == nullptr ||
-           snapshot_checker_->IsInSnapshot(ikey_.sequence, kMaxSequenceNumber));

-      // Apply the compaction filter to the first committed version of the user
-      // key.
-      if (current_key_committed_) {
-        InvokeFilterIfNeeded(&need_skip, &skip_until);
+#ifndef ROCKSDB_LITE
+      if (compaction_listener_) {
+        compaction_listener_->OnCompaction(compaction_->level(), ikey_.user_key,
+                                           fromInternalValueType(ikey_.type),
+                                           value_, ikey_.sequence, true);
+      }
+#endif  // ROCKSDB_LITE
+
+      // apply the compaction filter to the first occurrence of the user key
+      if (compaction_filter_ != nullptr && ikey_.type == kTypeValue &&
+          (visible_at_tip_ || ikey_.sequence > latest_snapshot_ ||
+           ignore_snapshots_)) {
+        // If the user has specified a compaction filter and the sequence
+        // number is greater than any external snapshot, then invoke the
+        // filter. If the return value of the compaction filter is true,
+        // replace the entry with a deletion marker.
+        CompactionFilter::Decision filter;
+        compaction_filter_value_.clear();
+        compaction_filter_skip_until_.Clear();
+        {
+          StopWatchNano timer(env_, true);
+          filter = compaction_filter_->FilterV2(
+              compaction_->level(), ikey_.user_key,
+              CompactionFilter::ValueType::kValue, value_,
+              &compaction_filter_value_, compaction_filter_skip_until_.rep());
+          iter_stats_.total_filter_time +=
+              env_ != nullptr ? timer.ElapsedNanos() : 0;
+        }
+
+        if (filter == CompactionFilter::Decision::kRemoveAndSkipUntil &&
+            cmp_->Compare(*compaction_filter_skip_until_.rep(),
+                          ikey_.user_key) <= 0) {
+          // Can't skip to a key smaller than the current one.
+          // Keep the key as per FilterV2 documentation.
+          filter = CompactionFilter::Decision::kKeep;
+        }
+
+        if (filter == CompactionFilter::Decision::kRemove) {
+          // convert the current key to a delete; key_ is pointing into
+          // current_key_ at this point, so updating current_key_ updates key()
+          ikey_.type = kTypeDeletion;
+          current_key_.UpdateInternalKey(ikey_.sequence, kTypeDeletion);
+          // no value associated with delete
+          value_.clear();
+          iter_stats_.num_record_drop_user++;
+        } else if (filter == CompactionFilter::Decision::kChangeValue) {
+          value_ = compaction_filter_value_;
+        } else if (filter == CompactionFilter::Decision::kRemoveAndSkipUntil) {
+          need_skip = true;
+          compaction_filter_skip_until_.ConvertFromUserKey(kMaxSequenceNumber,
+                                                           kValueTypeForSeek);
+          skip_until = compaction_filter_skip_until_.Encode();
+        }
      }
    } else {
+#ifndef ROCKSDB_LITE
+      if (compaction_listener_) {
+        compaction_listener_->OnCompaction(compaction_->level(), ikey_.user_key,
+                                           fromInternalValueType(ikey_.type),
+                                           value_, ikey_.sequence, false);
+      }
+#endif  // ROCKSDB_LITE
+
      // Update the current key to reflect the new sequence number/type without
      // copying the user key.
      // TODO(rven): Compaction filter does not process keys in this path
@@ -278,33 +289,13 @@ void CompactionIterator::NextFromInput() {
      current_key_.UpdateInternalKey(ikey_.sequence, ikey_.type);
      key_ = current_key_.GetInternalKey();
      ikey_.user_key = current_key_.GetUserKey();
-
-      // Note that newer version of a key is ordered before older versions. If a
-      // newer version of a key is committed, so as the older version. No need
-      // to query snapshot_checker_ in that case.
-      if (UNLIKELY(!current_key_committed_)) {
-        assert(snapshot_checker_ != nullptr);
-        current_key_committed_ =
-            snapshot_checker_->IsInSnapshot(ikey_.sequence, kMaxSequenceNumber);
-        // Apply the compaction filter to the first committed version of the
-        // user key.
-        if (current_key_committed_) {
-          InvokeFilterIfNeeded(&need_skip, &skip_until);
-        }
-      }
-    }
-
-    if (UNLIKELY(!current_key_committed_)) {
-      assert(snapshot_checker_ != nullptr);
-      valid_ = true;
-      break;
    }

    // If there are no snapshots, then this kv affect visibility at tip.
    // Otherwise, search though all existing snapshots to find the earliest
    // snapshot that is affected by this kv.
-    SequenceNumber last_sequence __attribute__((__unused__));
-    last_sequence = current_user_key_sequence_;
+    SequenceNumber last_sequence __attribute__((__unused__)) =
+        current_user_key_sequence_;
    current_user_key_sequence_ = ikey_.sequence;
    SequenceNumber last_snapshot = current_user_key_snapshot_;
    SequenceNumber prev_snapshot = 0;  // 0 means no previous snapshot
@@ -369,10 +360,7 @@ void CompactionIterator::NextFromInput() {
          cmp_->Equal(ikey_.user_key, next_ikey.user_key)) {
        // Check whether the next key belongs to the same snapshot as the
        // SingleDelete.
-        if (prev_snapshot == 0 || next_ikey.sequence > prev_snapshot ||
-            (snapshot_checker_ != nullptr &&
-             UNLIKELY(!snapshot_checker_->IsInSnapshot(next_ikey.sequence,
-                                                       prev_snapshot)))) {
+        if (prev_snapshot == 0 || next_ikey.sequence > prev_snapshot) {
          if (next_ikey.type == kTypeSingleDeletion) {
            // We encountered two SingleDeletes in a row.  This could be due to
            // unexpected user input.
@@ -383,12 +371,8 @@ void CompactionIterator::NextFromInput() {
            // input_->Next().
            ++iter_stats_.num_record_drop_obsolete;
            ++iter_stats_.num_single_del_mismatch;
-          } else if (has_outputted_key_ ||
-                     (ikey_.sequence <= earliest_write_conflict_snapshot_ &&
-                      (snapshot_checker_ == nullptr ||
-                       LIKELY(snapshot_checker_->IsInSnapshot(
-                           ikey_.sequence,
-                           earliest_write_conflict_snapshot_))))) {
+          } else if ((ikey_.sequence <= earliest_write_conflict_snapshot_) ||
+                     has_outputted_key_) {
            // Found a matching value, we can drop the single delete and the
            // value.  It is safe to drop both records since we've already
            // outputted a key in this snapshot, or there is no earlier
@@ -436,18 +420,12 @@ void CompactionIterator::NextFromInput() {
        // comparison, so the value of has_current_user_key does not matter.
        has_current_user_key_ = false;
        if (compaction_ != nullptr && ikey_.sequence <= earliest_snapshot_ &&
-            (snapshot_checker_ == nullptr ||
-             LIKELY(snapshot_checker_->IsInSnapshot(ikey_.sequence,
-                                                    earliest_snapshot_))) &&
            compaction_->KeyNotExistsBeyondOutputLevel(ikey_.user_key,
                                                       &level_ptrs_)) {
          // Key doesn't exist outside of this range.
          // Can compact out this SingleDelete.
          ++iter_stats_.num_record_drop_obsolete;
          ++iter_stats_.num_single_del_fallthru;
-          if (!bottommost_level_) {
-            ++iter_stats_.num_optimized_del_drop_obsolete;
-          }
        } else {
          // Output SingleDelete
          valid_ = true;
@@ -472,10 +450,6 @@ void CompactionIterator::NextFromInput() {
      input_->Next();
    } else if (compaction_ != nullptr && ikey_.type == kTypeDeletion &&
               ikey_.sequence <= earliest_snapshot_ &&
-               (snapshot_checker_ == nullptr ||
-                LIKELY(snapshot_checker_->IsInSnapshot(ikey_.sequence,
-                                                       earliest_snapshot_))) &&
-               ikeyNotNeededForIncrementalSnapshot() &&
               compaction_->KeyNotExistsBeyondOutputLevel(ikey_.user_key,
                                                          &level_ptrs_)) {
      // TODO(noetzli): This is the only place where we use compaction_
@@ -492,15 +466,7 @@ void CompactionIterator::NextFromInput() {
      //
      // Note:  Dropping this Delete will not affect TransactionDB
      // write-conflict checking since it is earlier than any snapshot.
-      //
-      // It seems that we can also drop deletion later than earliest snapshot
-      // given that:
-      // (1) The deletion is earlier than earliest_write_conflict_snapshot, and
-      // (2) No value exist earlier than the deletion.
      ++iter_stats_.num_record_drop_obsolete;
-      if (!bottommost_level_) {
-        ++iter_stats_.num_optimized_del_drop_obsolete;
-      }
      input_->Next();
    } else if (ikey_.type == kTypeMerge) {
      if (!merge_helper_->HasOperator()) {
@@ -526,8 +492,8 @@ void CompactionIterator::NextFromInput() {
        //       These will be correctly set below.
        key_ = merge_out_iter_.key();
        value_ = merge_out_iter_.value();
-        bool valid_key __attribute__((__unused__));
-        valid_key = ParseInternalKey(key_, &ikey_);
+        bool valid_key __attribute__((__unused__)) =
+            ParseInternalKey(key_, &ikey_);
        // MergeUntil stops when it encounters a corrupt key and does not
        // include them in the result, so we expect the keys here to valid.
        assert(valid_key);
@@ -577,18 +543,11 @@ void CompactionIterator::PrepareOutput() {
  // and the earliest snapshot is larger than this seqno
  // and the userkey differs from the last userkey in compaction
  // then we can squash the seqno to zero.
-  //
+
  // This is safe for TransactionDB write-conflict checking since transactions
  // only care about sequence number larger than any active snapshots.
-  //
-  // Can we do the same for levels above bottom level as long as
-  // KeyNotExistsBeyondOutputLevel() return true?
-  if ((compaction_ != nullptr &&
-      !compaction_->allow_ingest_behind()) &&
-      ikeyNotNeededForIncrementalSnapshot() &&
+  if ((compaction_ != nullptr && !compaction_->allow_ingest_behind()) &&
      bottommost_level_ && valid_ && ikey_.sequence <= earliest_snapshot_ &&
-      (snapshot_checker_ == nullptr || LIKELY(snapshot_checker_->IsInSnapshot(
-        ikey_.sequence, earliest_snapshot_))) &&
      ikey_.type != kTypeMerge &&
      !cmp_->Equal(compaction_->GetLargestUserKey(), ikey_.user_key)) {
    assert(ikey_.type != kTypeDeletion && ikey_.type != kTypeSingleDeletion);
@@ -600,11 +559,10 @@ void CompactionIterator::PrepareOutput() {
 inline SequenceNumber CompactionIterator::findEarliestVisibleSnapshot(
    SequenceNumber in, SequenceNumber* prev_snapshot) {
  assert(snapshots_->size());
-  SequenceNumber prev = kMaxSequenceNumber;
+  SequenceNumber prev __attribute__((__unused__)) = kMaxSequenceNumber;
  for (const auto cur : *snapshots_) {
    assert(prev == kMaxSequenceNumber || prev <= cur);
-    if (cur >= in && (snapshot_checker_ == nullptr ||
-                      snapshot_checker_->IsInSnapshot(in, cur))) {
+    if (cur >= in) {
      *prev_snapshot = prev == kMaxSequenceNumber ? 0 : prev;
      return cur;
    }
@@ -615,11 +573,4 @@ inline SequenceNumber CompactionIterator::findEarliestVisibleSnapshot(
  return kMaxSequenceNumber;
 }

-// used in 2 places - prevents deletion markers to be dropped if they may be
-// needed and disables seqnum zero-out in PrepareOutput for recent keys.
-inline bool CompactionIterator::ikeyNotNeededForIncrementalSnapshot() {
-  return (!compaction_->preserve_deletes()) ||
-         (ikey_.sequence < preserve_deletes_seqnum_);
-}
-
 }  // namespace rocksdb
@@ -14,12 +14,13 @@
 #include "db/merge_helper.h"
 #include "db/pinned_iterators_manager.h"
 #include "db/range_del_aggregator.h"
-#include "db/snapshot_checker.h"
 #include "options/cf_options.h"
 #include "rocksdb/compaction_filter.h"

 namespace rocksdb {

+class CompactionEventListener;
+
 class CompactionIterator {
 public:
  // A wrapper around Compaction. Has a much smaller interface, only what
@@ -30,7 +31,7 @@ class CompactionIterator {
        : compaction_(compaction) {}

    virtual ~CompactionProxy() = default;
-    virtual int level(size_t /*compaction_input_level*/ = 0) const {
+    virtual int level(size_t compaction_input_level = 0) const {
      return compaction_->level();
    }
    virtual bool KeyNotExistsBeyondOutputLevel(
@@ -47,9 +48,6 @@ class CompactionIterator {
    virtual bool allow_ingest_behind() const {
      return compaction_->immutable_cf_options()->allow_ingest_behind;
    }
-    virtual bool preserve_deletes() const {
-      return compaction_->immutable_cf_options()->preserve_deletes;
-    }

   protected:
    CompactionProxy() = default;
@@ -61,27 +59,25 @@ class CompactionIterator {
  CompactionIterator(InternalIterator* input, const Comparator* cmp,
                     MergeHelper* merge_helper, SequenceNumber last_sequence,
                     std::vector<SequenceNumber>* snapshots,
-                     SequenceNumber earliest_write_conflict_snapshot,
-                     const SnapshotChecker* snapshot_checker, Env* env,
+                     SequenceNumber earliest_write_conflict_snapshot, Env* env,
                     bool expect_valid_internal_key,
                     RangeDelAggregator* range_del_agg,
                     const Compaction* compaction = nullptr,
                     const CompactionFilter* compaction_filter = nullptr,
-                     const std::atomic<bool>* shutting_down = nullptr,
-                     const SequenceNumber preserve_deletes_seqnum = 0);
+                     CompactionEventListener* compaction_listener = nullptr,
+                     const std::atomic<bool>* shutting_down = nullptr);

  // Constructor with custom CompactionProxy, used for tests.
  CompactionIterator(InternalIterator* input, const Comparator* cmp,
                     MergeHelper* merge_helper, SequenceNumber last_sequence,
                     std::vector<SequenceNumber>* snapshots,
-                     SequenceNumber earliest_write_conflict_snapshot,
-                     const SnapshotChecker* snapshot_checker, Env* env,
+                     SequenceNumber earliest_write_conflict_snapshot, Env* env,
                     bool expect_valid_internal_key,
                     RangeDelAggregator* range_del_agg,
                     std::unique_ptr<CompactionProxy> compaction,
                     const CompactionFilter* compaction_filter = nullptr,
-                     const std::atomic<bool>* shutting_down = nullptr,
-                     const SequenceNumber preserve_deletes_seqnum = 0);
+                     CompactionEventListener* compaction_listener = nullptr,
+                     const std::atomic<bool>* shutting_down = nullptr);

  ~CompactionIterator();

@@ -115,9 +111,6 @@ class CompactionIterator {
  // compression.
  void PrepareOutput();

-  // Invoke compaction filter if needed.
-  void InvokeFilterIfNeeded(bool* need_skip, Slice* skip_until);
-
  // Given a sequence number, return the sequence number of the
  // earliest snapshot that this sequence number is visible in.
  // The snapshots themselves are arranged in ascending order of
@@ -127,24 +120,20 @@ class CompactionIterator {
  inline SequenceNumber findEarliestVisibleSnapshot(
      SequenceNumber in, SequenceNumber* prev_snapshot);

-  // Checks whether the currently seen ikey_ is needed for
-  // incremental (differential) snapshot and hence can't be dropped
-  // or seqnum be zero-ed out even if all other conditions for it are met.
-  inline bool ikeyNotNeededForIncrementalSnapshot();
-
  InternalIterator* input_;
  const Comparator* cmp_;
  MergeHelper* merge_helper_;
  const std::vector<SequenceNumber>* snapshots_;
  const SequenceNumber earliest_write_conflict_snapshot_;
-  const SnapshotChecker* const snapshot_checker_;
  Env* env_;
  bool expect_valid_internal_key_;
  RangeDelAggregator* range_del_agg_;
  std::unique_ptr<CompactionProxy> compaction_;
  const CompactionFilter* compaction_filter_;
+#ifndef ROCKSDB_LITE
+  CompactionEventListener* compaction_listener_;
+#endif  // ROCKSDB_LITE
  const std::atomic<bool>* shutting_down_;
-  const SequenceNumber preserve_deletes_seqnum_;
  bool bottommost_level_;
  bool valid_ = false;
  bool visible_at_tip_;
@@ -200,10 +189,6 @@ class CompactionIterator {
  std::vector<size_t> level_ptrs_;
  CompactionIterationStats iter_stats_;

-  // Used to avoid purging uncommitted values. The application can specify
-  // uncommitted values by providing a SnapshotChecker object.
-  bool current_key_committed_;
-
  bool IsShuttingDown() {
    // This is a best-effort facility, so memory_order_relaxed is sufficient.
    return shutting_down_ && shutting_down_->load(std::memory_order_relaxed);
@@ -9,25 +9,23 @@
 #include <vector>

 #include "port/port.h"
-#include "util/string_util.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
-#include "utilities/merge_operators.h"

 namespace rocksdb {

 // Expects no merging attempts.
 class NoMergingMergeOp : public MergeOperator {
 public:
-  bool FullMergeV2(const MergeOperationInput& /*merge_in*/,
-                   MergeOperationOutput* /*merge_out*/) const override {
+  bool FullMergeV2(const MergeOperationInput& merge_in,
+                   MergeOperationOutput* merge_out) const override {
    ADD_FAILURE();
    return false;
  }
-  bool PartialMergeMulti(const Slice& /*key*/,
-                         const std::deque<Slice>& /*operand_list*/,
-                         std::string* /*new_value*/,
-                         Logger* /*logger*/) const override {
+  bool PartialMergeMulti(const Slice& key,
+                         const std::deque<Slice>& operand_list,
+                         std::string* new_value,
+                         Logger* logger) const override {
    ADD_FAILURE();
    return false;
  }
@@ -41,9 +39,9 @@ class NoMergingMergeOp : public MergeOperator {
 // Always returns Decition::kRemove.
 class StallingFilter : public CompactionFilter {
 public:
-  Decision FilterV2(int /*level*/, const Slice& key, ValueType /*type*/,
-                    const Slice& /*existing_value*/, std::string* /*new_value*/,
-                    std::string* /*skip_until*/) const override {
+  virtual Decision FilterV2(int level, const Slice& key, ValueType t,
+                            const Slice& existing_value, std::string* new_value,
+                            std::string* skip_until) const override {
    int k = std::atoi(key.ToString().c_str());
    last_seen.store(k);
    while (k >= stall_at.load()) {
@@ -74,18 +72,6 @@ class StallingFilter : public CompactionFilter {
  mutable std::atomic<int> last_seen{0};
 };

-// Compaction filter that filter out all keys.
-class FilterAllKeysCompactionFilter : public CompactionFilter {
- public:
-  Decision FilterV2(int /*level*/, const Slice& /*key*/, ValueType /*type*/,
-                    const Slice& /*existing_value*/, std::string* /*new_value*/,
-                    std::string* /*skip_until*/) const override {
-    return Decision::kRemove;
-  }
-
-  const char* Name() const override { return "AllKeysCompactionFilter"; }
-};
-
 class LoggingForwardVectorIterator : public InternalIterator {
 public:
  struct Action {
@@ -126,7 +112,7 @@ class LoggingForwardVectorIterator : public InternalIterator {
               keys_.begin();
  }

-  virtual void SeekForPrev(const Slice& /*target*/) override { assert(false); }
+  virtual void SeekForPrev(const Slice& target) override { assert(false); }

  virtual void Next() override {
    assert(Valid());
@@ -158,149 +144,71 @@ class FakeCompaction : public CompactionIterator::CompactionProxy {
 public:
  FakeCompaction() = default;

-  virtual int level(size_t /*compaction_input_level*/) const override {
-    return 0;
-  }
+  virtual int level(size_t compaction_input_level) const { return 0; }
  virtual bool KeyNotExistsBeyondOutputLevel(
-      const Slice& /*user_key*/,
-      std::vector<size_t>* /*level_ptrs*/) const override {
-    return is_bottommost_level || key_not_exists_beyond_output_level;
+      const Slice& user_key, std::vector<size_t>* level_ptrs) const {
+    return key_not_exists_beyond_output_level;
  }
-  virtual bool bottommost_level() const override { return is_bottommost_level; }
-  virtual int number_levels() const override { return 1; }
-  virtual Slice GetLargestUserKey() const override {
+  virtual bool bottommost_level() const { return false; }
+  virtual int number_levels() const { return 1; }
+  virtual Slice GetLargestUserKey() const {
    return "\xff\xff\xff\xff\xff\xff\xff\xff\xff";
  }
-  virtual bool allow_ingest_behind() const override { return false; }
-
-  virtual bool preserve_deletes() const override { return false; }
+  virtual bool allow_ingest_behind() const { return false; }

  bool key_not_exists_beyond_output_level = false;
-
-  bool is_bottommost_level = false;
 };

-// A simplifed snapshot checker which assumes each snapshot has a global
-// last visible sequence.
-class TestSnapshotChecker : public SnapshotChecker {
- public:
-  explicit TestSnapshotChecker(
-      SequenceNumber last_committed_sequence,
-      const std::unordered_map<SequenceNumber, SequenceNumber>& snapshots = {})
-      : last_committed_sequence_(last_committed_sequence),
-        snapshots_(snapshots) {}
-
-  bool IsInSnapshot(SequenceNumber seq,
-                    SequenceNumber snapshot_seq) const override {
-    if (snapshot_seq == kMaxSequenceNumber) {
-      return seq <= last_committed_sequence_;
-    }
-    assert(snapshots_.count(snapshot_seq) > 0);
-    return seq <= snapshots_.at(snapshot_seq);
-  }
-
- private:
-  SequenceNumber last_committed_sequence_;
-  // A map of valid snapshot to last visible sequence to the snapshot.
-  std::unordered_map<SequenceNumber, SequenceNumber> snapshots_;
-};
-
-// Test param:
-//   bool: whether to pass snapshot_checker to compaction iterator.
-class CompactionIteratorTest : public testing::TestWithParam<bool> {
+class CompactionIteratorTest : public testing::Test {
 public:
  CompactionIteratorTest()
      : cmp_(BytewiseComparator()), icmp_(cmp_), snapshots_({}) {}

-  void InitIterators(
-      const std::vector<std::string>& ks, const std::vector<std::string>& vs,
-      const std::vector<std::string>& range_del_ks,
-      const std::vector<std::string>& range_del_vs,
-      SequenceNumber last_sequence,
-      SequenceNumber last_committed_sequence = kMaxSequenceNumber,
-      MergeOperator* merge_op = nullptr, CompactionFilter* filter = nullptr,
-      bool bottommost_level = false,
-      SequenceNumber earliest_write_conflict_snapshot = kMaxSequenceNumber) {
+  void InitIterators(const std::vector<std::string>& ks,
+                     const std::vector<std::string>& vs,
+                     const std::vector<std::string>& range_del_ks,
+                     const std::vector<std::string>& range_del_vs,
+                     SequenceNumber last_sequence,
+                     MergeOperator* merge_op = nullptr,
+                     CompactionFilter* filter = nullptr) {
    std::unique_ptr<InternalIterator> range_del_iter(
        new test::VectorIterator(range_del_ks, range_del_vs));
    range_del_agg_.reset(new RangeDelAggregator(icmp_, snapshots_));
    ASSERT_OK(range_del_agg_->AddTombstones(std::move(range_del_iter)));

    std::unique_ptr<CompactionIterator::CompactionProxy> compaction;
-    if (filter || bottommost_level) {
+    if (filter) {
      compaction_proxy_ = new FakeCompaction();
-      compaction_proxy_->is_bottommost_level = bottommost_level;
      compaction.reset(compaction_proxy_);
    }
-    bool use_snapshot_checker = UseSnapshotChecker() || GetParam();
-    if (use_snapshot_checker || last_committed_sequence < kMaxSequenceNumber) {
-      snapshot_checker_.reset(
-          new TestSnapshotChecker(last_committed_sequence, snapshot_map_));
-    }
-    merge_helper_.reset(
-        new MergeHelper(Env::Default(), cmp_, merge_op, filter, nullptr, false,
-                        0 /*latest_snapshot*/, snapshot_checker_.get(),
-                        0 /*level*/, nullptr /*statistics*/, &shutting_down_));

+    merge_helper_.reset(new MergeHelper(Env::Default(), cmp_, merge_op, filter,
+                                        nullptr, false, 0, 0, nullptr,
+                                        &shutting_down_));
    iter_.reset(new LoggingForwardVectorIterator(ks, vs));
    iter_->SeekToFirst();
    c_iter_.reset(new CompactionIterator(
        iter_.get(), cmp_, merge_helper_.get(), last_sequence, &snapshots_,
-        earliest_write_conflict_snapshot, snapshot_checker_.get(),
-        Env::Default(), false, range_del_agg_.get(), std::move(compaction),
-        filter, &shutting_down_));
+        kMaxSequenceNumber, Env::Default(), false, range_del_agg_.get(),
+        std::move(compaction), filter, nullptr, &shutting_down_));
  }

-  void AddSnapshot(SequenceNumber snapshot,
-                   SequenceNumber last_visible_seq = kMaxSequenceNumber) {
-    snapshots_.push_back(snapshot);
-    snapshot_map_[snapshot] = last_visible_seq;
-  }
-
-  virtual bool UseSnapshotChecker() const { return false; }
-
-  void RunTest(
-      const std::vector<std::string>& input_keys,
-      const std::vector<std::string>& input_values,
-      const std::vector<std::string>& expected_keys,
-      const std::vector<std::string>& expected_values,
-      SequenceNumber last_committed_seq = kMaxSequenceNumber,
-      MergeOperator* merge_operator = nullptr,
-      CompactionFilter* compaction_filter = nullptr,
-      bool bottommost_level = false,
-      SequenceNumber earliest_write_conflict_snapshot = kMaxSequenceNumber) {
-    InitIterators(input_keys, input_values, {}, {}, kMaxSequenceNumber,
-                  last_committed_seq, merge_operator, compaction_filter,
-                  bottommost_level, earliest_write_conflict_snapshot);
-    c_iter_->SeekToFirst();
-    for (size_t i = 0; i < expected_keys.size(); i++) {
-      std::string info = "i = " + ToString(i);
-      ASSERT_TRUE(c_iter_->Valid()) << info;
-      ASSERT_OK(c_iter_->status()) << info;
-      ASSERT_EQ(expected_keys[i], c_iter_->key().ToString()) << info;
-      ASSERT_EQ(expected_values[i], c_iter_->value().ToString()) << info;
-      c_iter_->Next();
-    }
-    ASSERT_FALSE(c_iter_->Valid());
-  }
+  void AddSnapshot(SequenceNumber snapshot) { snapshots_.push_back(snapshot); }

  const Comparator* cmp_;
  const InternalKeyComparator icmp_;
  std::vector<SequenceNumber> snapshots_;
-  // A map of valid snapshot to last visible sequence to the snapshot.
-  std::unordered_map<SequenceNumber, SequenceNumber> snapshot_map_;
  std::unique_ptr<MergeHelper> merge_helper_;
  std::unique_ptr<LoggingForwardVectorIterator> iter_;
  std::unique_ptr<CompactionIterator> c_iter_;
  std::unique_ptr<RangeDelAggregator> range_del_agg_;
-  std::unique_ptr<SnapshotChecker> snapshot_checker_;
  std::atomic<bool> shutting_down_{false};
  FakeCompaction* compaction_proxy_;
 };

 // It is possible that the output of the compaction iterator is empty even if
 // the input is not.
-TEST_P(CompactionIteratorTest, EmptyResult) {
+TEST_F(CompactionIteratorTest, EmptyResult) {
  InitIterators({test::KeyStr("a", 5, kTypeSingleDeletion),
                 test::KeyStr("a", 3, kTypeValue)},
                {"", "val"}, {}, {}, 5);
@@ -310,7 +218,7 @@ TEST_P(CompactionIteratorTest, EmptyResult) {

 // If there is a corruption after a single deletion, the corrupted key should
 // be preserved.
-TEST_P(CompactionIteratorTest, CorruptionAfterSingleDeletion) {
+TEST_F(CompactionIteratorTest, CorruptionAfterSingleDeletion) {
  InitIterators({test::KeyStr("a", 5, kTypeSingleDeletion),
                 test::KeyStr("a", 3, kTypeValue, true),
                 test::KeyStr("b", 10, kTypeValue)},
@@ -329,7 +237,7 @@ TEST_P(CompactionIteratorTest, CorruptionAfterSingleDeletion) {
  ASSERT_FALSE(c_iter_->Valid());
 }

-TEST_P(CompactionIteratorTest, SimpleRangeDeletion) {
+TEST_F(CompactionIteratorTest, SimpleRangeDeletion) {
  InitIterators({test::KeyStr("morning", 5, kTypeValue),
                 test::KeyStr("morning", 2, kTypeValue),
                 test::KeyStr("night", 3, kTypeValue)},
@@ -345,7 +253,7 @@ TEST_P(CompactionIteratorTest, SimpleRangeDeletion) {
  ASSERT_FALSE(c_iter_->Valid());
 }

-TEST_P(CompactionIteratorTest, RangeDeletionWithSnapshots) {
+TEST_F(CompactionIteratorTest, RangeDeletionWithSnapshots) {
  AddSnapshot(10);
  std::vector<std::string> ks1;
  ks1.push_back(test::KeyStr("ma", 28, kTypeRangeDeletion));
@@ -366,11 +274,11 @@ TEST_P(CompactionIteratorTest, RangeDeletionWithSnapshots) {
  ASSERT_FALSE(c_iter_->Valid());
 }

-TEST_P(CompactionIteratorTest, CompactionFilterSkipUntil) {
+TEST_F(CompactionIteratorTest, CompactionFilterSkipUntil) {
  class Filter : public CompactionFilter {
-    virtual Decision FilterV2(int /*level*/, const Slice& key, ValueType t,
+    virtual Decision FilterV2(int level, const Slice& key, ValueType t,
                              const Slice& existing_value,
-                              std::string* /*new_value*/,
+                              std::string* new_value,
                              std::string* skip_until) const override {
      std::string k = key.ToString();
      std::string v = existing_value.ToString();
@@ -441,7 +349,7 @@ TEST_P(CompactionIteratorTest, CompactionFilterSkipUntil) {
       test::KeyStr("j", 99, kTypeValue)},
      {"av50", "am45", "bv60", "bv40", "cv35", "dm70", "em71", "fm65", "fm30",
       "fv25", "gv90", "hv91", "im95", "jv99"},
-      {}, {}, kMaxSequenceNumber, kMaxSequenceNumber, &merge_op, &filter);
+      {}, {}, kMaxSequenceNumber, &merge_op, &filter);

  // Compaction should output just "a", "e" and "h" keys.
  c_iter_->SeekToFirst();
@@ -476,14 +384,13 @@ TEST_P(CompactionIteratorTest, CompactionFilterSkipUntil) {
  ASSERT_EQ(expected_actions, iter_->log);
 }

-TEST_P(CompactionIteratorTest, ShuttingDownInFilter) {
+TEST_F(CompactionIteratorTest, ShuttingDownInFilter) {
  NoMergingMergeOp merge_op;
  StallingFilter filter;
  InitIterators(
      {test::KeyStr("1", 1, kTypeValue), test::KeyStr("2", 2, kTypeValue),
       test::KeyStr("3", 3, kTypeValue), test::KeyStr("4", 4, kTypeValue)},
-      {"v1", "v2", "v3", "v4"}, {}, {}, kMaxSequenceNumber, kMaxSequenceNumber,
-      &merge_op, &filter);
+      {"v1", "v2", "v3", "v4"}, {}, {}, kMaxSequenceNumber, &merge_op, &filter);
  // Don't leave tombstones (kTypeDeletion) for filtered keys.
  compaction_proxy_->key_not_exists_beyond_output_level = true;

@@ -514,14 +421,13 @@ TEST_P(CompactionIteratorTest, ShuttingDownInFilter) {

 // Same as ShuttingDownInFilter, but shutdown happens during filter call for
 // a merge operand, not for a value.
-TEST_P(CompactionIteratorTest, ShuttingDownInMerge) {
+TEST_F(CompactionIteratorTest, ShuttingDownInMerge) {
  NoMergingMergeOp merge_op;
  StallingFilter filter;
  InitIterators(
      {test::KeyStr("1", 1, kTypeValue), test::KeyStr("2", 2, kTypeMerge),
       test::KeyStr("3", 3, kTypeMerge), test::KeyStr("4", 4, kTypeValue)},
-      {"v1", "v2", "v3", "v4"}, {}, {}, kMaxSequenceNumber, kMaxSequenceNumber,
-      &merge_op, &filter);
+      {"v1", "v2", "v3", "v4"}, {}, {}, kMaxSequenceNumber, &merge_op, &filter);
  compaction_proxy_->key_not_exists_beyond_output_level = true;

  std::atomic<bool> seek_done{false};
@@ -549,403 +455,6 @@ TEST_P(CompactionIteratorTest, ShuttingDownInMerge) {
  EXPECT_EQ(2, filter.last_seen.load());
 }

-TEST_P(CompactionIteratorTest, SingleMergeOperand) {
-  class Filter : public CompactionFilter {
-    virtual Decision FilterV2(int /*level*/, const Slice& key, ValueType t,
-                              const Slice& existing_value,
-                              std::string* /*new_value*/,
-                              std::string* /*skip_until*/) const override {
-      std::string k = key.ToString();
-      std::string v = existing_value.ToString();
-
-      // See InitIterators() call below for the sequence of keys and their
-      // filtering decisions. Here we closely assert that compaction filter is
-      // called with the expected keys and only them, and with the right values.
-      if (k == "a") {
-        EXPECT_EQ(ValueType::kMergeOperand, t);
-        EXPECT_EQ("av1", v);
-        return Decision::kKeep;
-      } else if (k == "b") {
-        EXPECT_EQ(ValueType::kMergeOperand, t);
-        return Decision::kKeep;
-      } else if (k == "c") {
-        return Decision::kKeep;
-      }
-
-      ADD_FAILURE();
-      return Decision::kKeep;
-    }
-
-    const char* Name() const override {
-      return "CompactionIteratorTest.SingleMergeOperand::Filter";
-    }
-  };
-
-  class SingleMergeOp : public MergeOperator {
-   public:
-    bool FullMergeV2(const MergeOperationInput& merge_in,
-                     MergeOperationOutput* merge_out) const override {
-      // See InitIterators() call below for why "c" is the only key for which
-      // FullMergeV2 should be called.
-      EXPECT_EQ("c", merge_in.key.ToString());
-
-      std::string temp_value;
-      if (merge_in.existing_value != nullptr) {
-        temp_value = merge_in.existing_value->ToString();
-      }
-
-      for (auto& operand : merge_in.operand_list) {
-        temp_value.append(operand.ToString());
-      }
-      merge_out->new_value = temp_value;
-
-      return true;
-    }
-
-    bool PartialMergeMulti(const Slice& key,
-                           const std::deque<Slice>& operand_list,
-                           std::string* new_value,
-                           Logger* /*logger*/) const override {
-      std::string string_key = key.ToString();
-      EXPECT_TRUE(string_key == "a" || string_key == "b");
-
-      if (string_key == "a") {
-        EXPECT_EQ(1, operand_list.size());
-      } else if (string_key == "b") {
-        EXPECT_EQ(2, operand_list.size());
-      }
-
-      std::string temp_value;
-      for (auto& operand : operand_list) {
-        temp_value.append(operand.ToString());
-      }
-      swap(temp_value, *new_value);
-
-      return true;
-    }
-
-    const char* Name() const override {
-      return "CompactionIteratorTest SingleMergeOp";
-    }
-
-    bool AllowSingleOperand() const override { return true; }
-  };
-
-  SingleMergeOp merge_op;
-  Filter filter;
-  InitIterators(
-      // a should invoke PartialMergeMulti with a single merge operand.
-      {test::KeyStr("a", 50, kTypeMerge),
-       // b should invoke PartialMergeMulti with two operands.
-       test::KeyStr("b", 70, kTypeMerge), test::KeyStr("b", 60, kTypeMerge),
-       // c should invoke FullMerge due to kTypeValue at the beginning.
-       test::KeyStr("c", 90, kTypeMerge), test::KeyStr("c", 80, kTypeValue)},
-      {"av1", "bv2", "bv1", "cv2", "cv1"}, {}, {}, kMaxSequenceNumber,
-      kMaxSequenceNumber, &merge_op, &filter);
-
-  c_iter_->SeekToFirst();
-  ASSERT_TRUE(c_iter_->Valid());
-  ASSERT_EQ(test::KeyStr("a", 50, kTypeMerge), c_iter_->key().ToString());
-  ASSERT_EQ("av1", c_iter_->value().ToString());
-  c_iter_->Next();
-  ASSERT_TRUE(c_iter_->Valid());
-  ASSERT_EQ("bv1bv2", c_iter_->value().ToString());
-  c_iter_->Next();
-  ASSERT_EQ("cv1cv2", c_iter_->value().ToString());
-}
-
-// In bottommost level, values earlier than earliest snapshot can be output
-// with sequence = 0.
-TEST_P(CompactionIteratorTest, ZeroOutSequenceAtBottomLevel) {
-  AddSnapshot(1);
-  RunTest({test::KeyStr("a", 1, kTypeValue), test::KeyStr("b", 2, kTypeValue)},
-          {"v1", "v2"},
-          {test::KeyStr("a", 0, kTypeValue), test::KeyStr("b", 2, kTypeValue)},
-          {"v1", "v2"}, kMaxSequenceNumber /*last_commited_seq*/,
-          nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
-          true /*bottommost_level*/);
-}
-
-// In bottommost level, deletions earlier than earliest snapshot can be removed
-// permanently.
-TEST_P(CompactionIteratorTest, RemoveDeletionAtBottomLevel) {
-  AddSnapshot(1);
-  RunTest({test::KeyStr("a", 1, kTypeDeletion),
-           test::KeyStr("b", 2, kTypeDeletion)},
-          {"", ""}, {test::KeyStr("b", 2, kTypeDeletion)}, {""},
-          kMaxSequenceNumber /*last_commited_seq*/, nullptr /*merge_operator*/,
-          nullptr /*compaction_filter*/, true /*bottommost_level*/);
-}
-
-// In bottommost level, single deletions earlier than earliest snapshot can be
-// removed permanently.
-TEST_P(CompactionIteratorTest, RemoveSingleDeletionAtBottomLevel) {
-  AddSnapshot(1);
-  RunTest({test::KeyStr("a", 1, kTypeSingleDeletion),
-           test::KeyStr("b", 2, kTypeSingleDeletion)},
-          {"", ""}, {test::KeyStr("b", 2, kTypeSingleDeletion)}, {""},
-          kMaxSequenceNumber /*last_commited_seq*/, nullptr /*merge_operator*/,
-          nullptr /*compaction_filter*/, true /*bottommost_level*/);
-}
-
-INSTANTIATE_TEST_CASE_P(CompactionIteratorTestInstance, CompactionIteratorTest,
-                        testing::Values(true, false));
-
-// Tests how CompactionIterator work together with SnapshotChecker.
-class CompactionIteratorWithSnapshotCheckerTest
-    : public CompactionIteratorTest {
- public:
-  bool UseSnapshotChecker() const override { return true; }
-};
-
-// Uncommitted keys (keys with seq > last_committed_seq) should be output as-is
-// while committed version of these keys should get compacted as usual.
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       PreserveUncommittedKeys_Value) {
-  RunTest(
-      {test::KeyStr("foo", 3, kTypeValue), test::KeyStr("foo", 2, kTypeValue),
-       test::KeyStr("foo", 1, kTypeValue)},
-      {"v3", "v2", "v1"},
-      {test::KeyStr("foo", 3, kTypeValue), test::KeyStr("foo", 2, kTypeValue)},
-      {"v3", "v2"}, 2 /*last_committed_seq*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       PreserveUncommittedKeys_Deletion) {
-  RunTest({test::KeyStr("foo", 2, kTypeDeletion),
-           test::KeyStr("foo", 1, kTypeValue)},
-          {"", "v1"},
-          {test::KeyStr("foo", 2, kTypeDeletion),
-           test::KeyStr("foo", 1, kTypeValue)},
-          {"", "v1"}, 1 /*last_committed_seq*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       PreserveUncommittedKeys_Merge) {
-  auto merge_op = MergeOperators::CreateStringAppendOperator();
-  RunTest(
-      {test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 2, kTypeMerge),
-       test::KeyStr("foo", 1, kTypeValue)},
-      {"v3", "v2", "v1"},
-      {test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 2, kTypeValue)},
-      {"v3", "v1,v2"}, 2 /*last_committed_seq*/, merge_op.get());
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       PreserveUncommittedKeys_SingleDelete) {
-  RunTest({test::KeyStr("foo", 2, kTypeSingleDeletion),
-           test::KeyStr("foo", 1, kTypeValue)},
-          {"", "v1"},
-          {test::KeyStr("foo", 2, kTypeSingleDeletion),
-           test::KeyStr("foo", 1, kTypeValue)},
-          {"", "v1"}, 1 /*last_committed_seq*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       PreserveUncommittedKeys_BlobIndex) {
-  RunTest({test::KeyStr("foo", 3, kTypeBlobIndex),
-           test::KeyStr("foo", 2, kTypeBlobIndex),
-           test::KeyStr("foo", 1, kTypeBlobIndex)},
-          {"v3", "v2", "v1"},
-          {test::KeyStr("foo", 3, kTypeBlobIndex),
-           test::KeyStr("foo", 2, kTypeBlobIndex)},
-          {"v3", "v2"}, 2 /*last_committed_seq*/);
-}
-
-// Test compaction iterator dedup keys visible to the same snapshot.
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_Value) {
-  AddSnapshot(2, 1);
-  RunTest(
-      {test::KeyStr("foo", 4, kTypeValue), test::KeyStr("foo", 3, kTypeValue),
-       test::KeyStr("foo", 2, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
-      {"v4", "v3", "v2", "v1"},
-      {test::KeyStr("foo", 4, kTypeValue), test::KeyStr("foo", 3, kTypeValue),
-       test::KeyStr("foo", 1, kTypeValue)},
-      {"v4", "v3", "v1"}, 3 /*last_committed_seq*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_Deletion) {
-  AddSnapshot(2, 1);
-  RunTest(
-      {test::KeyStr("foo", 4, kTypeValue),
-       test::KeyStr("foo", 3, kTypeDeletion),
-       test::KeyStr("foo", 2, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
-      {"v4", "", "v2", "v1"},
-      {test::KeyStr("foo", 4, kTypeValue),
-       test::KeyStr("foo", 3, kTypeDeletion),
-       test::KeyStr("foo", 1, kTypeValue)},
-      {"v4", "", "v1"}, 3 /*last_committed_seq*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_Merge) {
-  AddSnapshot(2, 1);
-  AddSnapshot(4, 3);
-  auto merge_op = MergeOperators::CreateStringAppendOperator();
-  RunTest(
-      {test::KeyStr("foo", 5, kTypeMerge), test::KeyStr("foo", 4, kTypeMerge),
-       test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 2, kTypeMerge),
-       test::KeyStr("foo", 1, kTypeValue)},
-      {"v5", "v4", "v3", "v2", "v1"},
-      {test::KeyStr("foo", 5, kTypeMerge), test::KeyStr("foo", 4, kTypeMerge),
-       test::KeyStr("foo", 3, kTypeMerge), test::KeyStr("foo", 1, kTypeValue)},
-      {"v5", "v4", "v2,v3", "v1"}, 4 /*last_committed_seq*/, merge_op.get());
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       DedupSameSnapshot_SingleDeletion) {
-  AddSnapshot(2, 1);
-  RunTest(
-      {test::KeyStr("foo", 4, kTypeValue),
-       test::KeyStr("foo", 3, kTypeSingleDeletion),
-       test::KeyStr("foo", 2, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
-      {"v4", "", "v2", "v1"},
-      {test::KeyStr("foo", 4, kTypeValue), test::KeyStr("foo", 1, kTypeValue)},
-      {"v4", "v1"}, 3 /*last_committed_seq*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest, DedupSameSnapshot_BlobIndex) {
-  AddSnapshot(2, 1);
-  RunTest({test::KeyStr("foo", 4, kTypeBlobIndex),
-           test::KeyStr("foo", 3, kTypeBlobIndex),
-           test::KeyStr("foo", 2, kTypeBlobIndex),
-           test::KeyStr("foo", 1, kTypeBlobIndex)},
-          {"v4", "v3", "v2", "v1"},
-          {test::KeyStr("foo", 4, kTypeBlobIndex),
-           test::KeyStr("foo", 3, kTypeBlobIndex),
-           test::KeyStr("foo", 1, kTypeBlobIndex)},
-          {"v4", "v3", "v1"}, 3 /*last_committed_seq*/);
-}
-
-// At bottom level, sequence numbers can be zero out, and deletions can be
-// removed, but only when they are visible to earliest snapshot.
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       NotZeroOutSequenceIfNotVisibleToEarliestSnapshot) {
-  AddSnapshot(2, 1);
-  RunTest({test::KeyStr("a", 1, kTypeValue), test::KeyStr("b", 2, kTypeValue),
-           test::KeyStr("c", 3, kTypeValue)},
-          {"v1", "v2", "v3"},
-          {test::KeyStr("a", 0, kTypeValue), test::KeyStr("b", 2, kTypeValue),
-           test::KeyStr("c", 3, kTypeValue)},
-          {"v1", "v2", "v3"}, kMaxSequenceNumber /*last_commited_seq*/,
-          nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
-          true /*bottommost_level*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       NotRemoveDeletionIfNotVisibleToEarliestSnapshot) {
-  AddSnapshot(2, 1);
-  RunTest(
-      {test::KeyStr("a", 1, kTypeDeletion), test::KeyStr("b", 2, kTypeDeletion),
-       test::KeyStr("c", 3, kTypeDeletion)},
-      {"", "", ""},
-      {test::KeyStr("b", 2, kTypeDeletion),
-       test::KeyStr("c", 3, kTypeDeletion)},
-      {"", ""}, kMaxSequenceNumber /*last_commited_seq*/,
-      nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
-      true /*bottommost_level*/);
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       NotRemoveSingleDeletionIfNotVisibleToEarliestSnapshot) {
-  AddSnapshot(2, 1);
-  RunTest({test::KeyStr("a", 1, kTypeSingleDeletion),
-           test::KeyStr("b", 2, kTypeSingleDeletion),
-           test::KeyStr("c", 3, kTypeSingleDeletion)},
-          {"", "", ""},
-          {test::KeyStr("b", 2, kTypeSingleDeletion),
-           test::KeyStr("c", 3, kTypeSingleDeletion)},
-          {"", ""}, kMaxSequenceNumber /*last_commited_seq*/,
-          nullptr /*merge_operator*/, nullptr /*compaction_filter*/,
-          true /*bottommost_level*/);
-}
-
-// Single delete should not cancel out values that not visible to the
-// same set of snapshots
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       SingleDeleteAcrossSnapshotBoundary) {
-  AddSnapshot(2, 1);
-  RunTest({test::KeyStr("a", 2, kTypeSingleDeletion),
-           test::KeyStr("a", 1, kTypeValue)},
-          {"", "v1"},
-          {test::KeyStr("a", 2, kTypeSingleDeletion),
-           test::KeyStr("a", 1, kTypeValue)},
-          {"", "v1"}, 2 /*last_committed_seq*/);
-}
-
-// Single delete should be kept in case it is not visible to the
-// earliest write conflict snapshot. If a single delete is kept for this reason,
-// corresponding value can be trimmed to save space.
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       KeepSingleDeletionForWriteConflictChecking) {
-  AddSnapshot(2, 0);
-  RunTest({test::KeyStr("a", 2, kTypeSingleDeletion),
-           test::KeyStr("a", 1, kTypeValue)},
-          {"", "v1"},
-          {test::KeyStr("a", 2, kTypeSingleDeletion),
-           test::KeyStr("a", 1, kTypeValue)},
-          {"", ""}, 2 /*last_committed_seq*/, nullptr /*merge_operator*/,
-          nullptr /*compaction_filter*/, false /*bottommost_level*/,
-          2 /*earliest_write_conflict_snapshot*/);
-}
-
-// Compaction filter should keep uncommitted key as-is, and
-//   * Convert the latest velue to deletion, and/or
-//   * if latest value is a merge, apply filter to all suequent merges.
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest, CompactionFilter_Value) {
-  std::unique_ptr<CompactionFilter> compaction_filter(
-      new FilterAllKeysCompactionFilter());
-  RunTest(
-      {test::KeyStr("a", 2, kTypeValue), test::KeyStr("a", 1, kTypeValue),
-       test::KeyStr("b", 3, kTypeValue), test::KeyStr("c", 1, kTypeValue)},
-      {"v2", "v1", "v3", "v4"},
-      {test::KeyStr("a", 2, kTypeValue), test::KeyStr("a", 1, kTypeDeletion),
-       test::KeyStr("b", 3, kTypeValue), test::KeyStr("c", 1, kTypeDeletion)},
-      {"v2", "", "v3", ""}, 1 /*last_committed_seq*/,
-      nullptr /*merge_operator*/, compaction_filter.get());
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest, CompactionFilter_Deletion) {
-  std::unique_ptr<CompactionFilter> compaction_filter(
-      new FilterAllKeysCompactionFilter());
-  RunTest(
-      {test::KeyStr("a", 2, kTypeDeletion), test::KeyStr("a", 1, kTypeValue)},
-      {"", "v1"},
-      {test::KeyStr("a", 2, kTypeDeletion),
-       test::KeyStr("a", 1, kTypeDeletion)},
-      {"", ""}, 1 /*last_committed_seq*/, nullptr /*merge_operator*/,
-      compaction_filter.get());
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest,
-       CompactionFilter_PartialMerge) {
-  std::shared_ptr<MergeOperator> merge_op =
-      MergeOperators::CreateStringAppendOperator();
-  std::unique_ptr<CompactionFilter> compaction_filter(
-      new FilterAllKeysCompactionFilter());
-  RunTest({test::KeyStr("a", 3, kTypeMerge), test::KeyStr("a", 2, kTypeMerge),
-           test::KeyStr("a", 1, kTypeMerge)},
-          {"v3", "v2", "v1"}, {test::KeyStr("a", 3, kTypeMerge)}, {"v3"},
-          2 /*last_committed_seq*/, merge_op.get(), compaction_filter.get());
-}
-
-TEST_F(CompactionIteratorWithSnapshotCheckerTest, CompactionFilter_FullMerge) {
-  std::shared_ptr<MergeOperator> merge_op =
-      MergeOperators::CreateStringAppendOperator();
-  std::unique_ptr<CompactionFilter> compaction_filter(
-      new FilterAllKeysCompactionFilter());
-  RunTest(
-      {test::KeyStr("a", 3, kTypeMerge), test::KeyStr("a", 2, kTypeMerge),
-       test::KeyStr("a", 1, kTypeValue)},
-      {"v3", "v2", "v1"},
-      {test::KeyStr("a", 3, kTypeMerge), test::KeyStr("a", 1, kTypeDeletion)},
-      {"v3", ""}, 2 /*last_committed_seq*/, merge_op.get(),
-      compaction_filter.get());
-}
-
 }  // namespace rocksdb

 int main(int argc, char** argv) {
@@ -38,6 +38,7 @@
 #include "monitoring/iostats_context_imp.h"
 #include "monitoring/perf_context_imp.h"
 #include "monitoring/thread_status_util.h"
+#include "port/likely.h"
 #include "port/port.h"
 #include "rocksdb/db.h"
 #include "rocksdb/env.h"
@@ -263,16 +264,15 @@ void CompactionJob::AggregateStatistics() {

 CompactionJob::CompactionJob(
    int job_id, Compaction* compaction, const ImmutableDBOptions& db_options,
-    const EnvOptions env_options, VersionSet* versions,
-    const std::atomic<bool>* shutting_down,
-    const SequenceNumber preserve_deletes_seqnum, LogBuffer* log_buffer,
+    const EnvOptions& env_options, VersionSet* versions,
+    const std::atomic<bool>* shutting_down, LogBuffer* log_buffer,
    Directory* db_directory, Directory* output_directory, Statistics* stats,
    InstrumentedMutex* db_mutex, Status* db_bg_error,
    std::vector<SequenceNumber> existing_snapshots,
    SequenceNumber earliest_write_conflict_snapshot,
-    const SnapshotChecker* snapshot_checker, std::shared_ptr<Cache> table_cache,
-    EventLogger* event_logger, bool paranoid_file_checks, bool measure_io_stats,
-    const std::string& dbname, CompactionJobStats* compaction_job_stats)
+    std::shared_ptr<Cache> table_cache, EventLogger* event_logger,
+    bool paranoid_file_checks, bool measure_io_stats, const std::string& dbname,
+    CompactionJobStats* compaction_job_stats)
    : job_id_(job_id),
      compact_(new CompactionState(compaction)),
      compaction_job_stats_(compaction_job_stats),
@@ -281,11 +281,8 @@ CompactionJob::CompactionJob(
      db_options_(db_options),
      env_options_(env_options),
      env_(db_options.env),
-      env_optiosn_for_read_(
-          env_->OptimizeForCompactionTableRead(env_options, db_options_)),
      versions_(versions),
      shutting_down_(shutting_down),
-      preserve_deletes_seqnum_(preserve_deletes_seqnum),
      log_buffer_(log_buffer),
      db_directory_(db_directory),
      output_directory_(output_directory),
@@ -294,13 +291,10 @@ CompactionJob::CompactionJob(
      db_bg_error_(db_bg_error),
      existing_snapshots_(std::move(existing_snapshots)),
      earliest_write_conflict_snapshot_(earliest_write_conflict_snapshot),
-      snapshot_checker_(snapshot_checker),
      table_cache_(std::move(table_cache)),
      event_logger_(event_logger),
-      bottommost_level_(false),
      paranoid_file_checks_(paranoid_file_checks),
-      measure_io_stats_(measure_io_stats),
-      write_hint_(Env::WLTH_NOT_SET) {
+      measure_io_stats_(measure_io_stats) {
  assert(log_buffer_ != nullptr);
  const auto* cfd = compact_->compaction->column_family_data();
  ThreadStatusUtil::SetColumnFamily(cfd, cfd->ioptions()->env,
@@ -371,8 +365,6 @@ void CompactionJob::Prepare() {
  assert(c->column_family_data()->current()->storage_info()
      ->NumLevelFiles(compact_->compaction->level()) > 0);

-  write_hint_ = c->column_family_data()->CalculateSSTWriteHint(
-    c->output_level());
  // Is this compaction producing files at the bottommost level?
  bottommost_level_ = c->bottommost_level();

@@ -602,9 +594,6 @@ Status CompactionJob::Install(const MutableCFOptions& mutable_cf_options) {

  double read_write_amp = 0.0;
  double write_amp = 0.0;
-  double bytes_read_per_sec = 0;
-  double bytes_written_per_sec = 0;
-
  if (stats.bytes_read_non_output_levels > 0) {
    read_write_amp = (stats.bytes_written + stats.bytes_read_output_level +
                      stats.bytes_read_non_output_levels) /
@@ -612,46 +601,37 @@ Status CompactionJob::Install(const MutableCFOptions& mutable_cf_options) {
    write_amp = stats.bytes_written /
                static_cast<double>(stats.bytes_read_non_output_levels);
  }
-  if (stats.micros > 0) {
-    bytes_read_per_sec =
-        (stats.bytes_read_non_output_levels + stats.bytes_read_output_level) /
-        static_cast<double>(stats.micros);
-    bytes_written_per_sec =
-        stats.bytes_written / static_cast<double>(stats.micros);
-  }
-
  ROCKS_LOG_BUFFER(
      log_buffer_,
      "[%s] compacted to: %s, MB/sec: %.1f rd, %.1f wr, level %d, "
      "files in(%d, %d) out(%d) "
      "MB in(%.1f, %.1f) out(%.1f), read-write-amplify(%.1f) "
-      "write-amplify(%.1f) %s, records in: %" PRIu64
-      ", records dropped: %" PRIu64 " output_compression: %s\n",
-      cfd->GetName().c_str(), vstorage->LevelSummary(&tmp), bytes_read_per_sec,
-      bytes_written_per_sec, compact_->compaction->output_level(),
+      "write-amplify(%.1f) %s, records in: %d, records dropped: %d\n",
+      cfd->GetName().c_str(), vstorage->LevelSummary(&tmp),
+      (stats.bytes_read_non_output_levels + stats.bytes_read_output_level) /
+          static_cast<double>(stats.micros),
+      stats.bytes_written / static_cast<double>(stats.micros),
+      compact_->compaction->output_level(),
      stats.num_input_files_in_non_output_levels,
      stats.num_input_files_in_output_level, stats.num_output_files,
      stats.bytes_read_non_output_levels / 1048576.0,
      stats.bytes_read_output_level / 1048576.0,
      stats.bytes_written / 1048576.0, read_write_amp, write_amp,
      status.ToString().c_str(), stats.num_input_records,
-      stats.num_dropped_records,
-      CompressionTypeToString(compact_->compaction->output_compression())
-          .c_str());
+      stats.num_dropped_records);

  UpdateCompactionJobStats(stats);

  auto stream = event_logger_->LogToBuffer(log_buffer_);
-  stream << "job" << job_id_ << "event"
-         << "compaction_finished"
+  stream << "job" << job_id_
+         << "event" << "compaction_finished"
         << "compaction_time_micros" << compaction_stats_.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"
-         << compact_->num_output_records << "num_subcompactions"
-         << compact_->sub_compact_states.size() << "output_compression"
-         << CompressionTypeToString(compact_->compaction->output_compression());
+         << "total_output_size" << compact_->total_bytes
+         << "num_input_records" << compact_->num_input_records
+         << "num_output_records" << compact_->num_output_records
+         << "num_subcompactions" << compact_->sub_compact_states.size();

  if (compaction_job_stats_ != nullptr) {
    stream << "num_single_delete_mismatches"
@@ -686,7 +666,7 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
  std::unique_ptr<RangeDelAggregator> range_del_agg(
      new RangeDelAggregator(cfd->internal_comparator(), existing_snapshots_));
  std::unique_ptr<InternalIterator> input(versions_->MakeInputIterator(
-      sub_compact->compaction, range_del_agg.get(), env_optiosn_for_read_));
+      sub_compact->compaction, range_del_agg.get()));

  AutoThreadOperationStageUpdater stage_updater(
      ThreadStatus::STAGE_COMPACTION_PROCESS_KV);
@@ -711,28 +691,23 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
      sub_compact->compaction->mutable_cf_options();

  // To build compression dictionary, we sample the first output file, assuming
-  // it'll reach the maximum length. We optionally pass these samples through
-  // zstd's dictionary trainer, or just use them directly. Then, the dictionary
-  // is used for compressing subsequent output files in the same subcompaction.
-  const bool kUseZstdTrainer =
-      cfd->ioptions()->compression_opts.zstd_max_train_bytes > 0;
-  const size_t kSampleBytes =
-      kUseZstdTrainer ? cfd->ioptions()->compression_opts.zstd_max_train_bytes
-                      : cfd->ioptions()->compression_opts.max_dict_bytes;
+  // it'll reach the maximum length, and then use the dictionary for compressing
+  // subsequent output files. The dictionary may be less than max_dict_bytes if
+  // the first output file's length is less than the maximum.
  const int kSampleLenShift = 6;  // 2^6 = 64-byte samples
  std::set<size_t> sample_begin_offsets;
-  if (bottommost_level_ && kSampleBytes > 0) {
-    const size_t kMaxSamples = kSampleBytes >> kSampleLenShift;
-    const size_t kOutFileLen = static_cast<size_t>(
-      mutable_cf_options->MaxFileSizeForLevel(
-        compact_->compaction->output_level()));
+  if (bottommost_level_ &&
+      cfd->ioptions()->compression_opts.max_dict_bytes > 0) {
+    const size_t kMaxSamples =
+        cfd->ioptions()->compression_opts.max_dict_bytes >> kSampleLenShift;
+    const size_t kOutFileLen = mutable_cf_options->MaxFileSizeForLevel(
+        compact_->compaction->output_level());
    if (kOutFileLen != port::kMaxSizet) {
      const size_t kOutFileNumSamples = kOutFileLen >> kSampleLenShift;
      Random64 generator{versions_->NewFileNumber()};
      for (size_t i = 0; i < kMaxSamples; ++i) {
-        sample_begin_offsets.insert(
-          static_cast<size_t>(generator.Uniform(kOutFileNumSamples))
-            << kSampleLenShift);
+        sample_begin_offsets.insert(generator.Uniform(kOutFileNumSamples)
+                                    << kSampleLenShift);
      }
    }
  }
@@ -749,8 +724,8 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
      compaction_filter, db_options_.info_log.get(),
      false /* internal key corruption is expected */,
      existing_snapshots_.empty() ? 0 : existing_snapshots_.back(),
-      snapshot_checker_, compact_->compaction->level(),
-      db_options_.statistics.get(), shutting_down_);
+      compact_->compaction->level(), db_options_.statistics.get(),
+      shutting_down_);

  TEST_SYNC_POINT("CompactionJob::Run():Inprogress");

@@ -764,13 +739,23 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
    input->SeekToFirst();
  }

+  // we allow only 1 compaction event listener. Used by blob storage
+  CompactionEventListener* comp_event_listener = nullptr;
+#ifndef ROCKSDB_LITE
+  for (auto& celitr : cfd->ioptions()->listeners) {
+    comp_event_listener = celitr->GetCompactionEventListener();
+    if (comp_event_listener != nullptr) {
+      break;
+    }
+  }
+#endif  // ROCKSDB_LITE
+
  Status status;
  sub_compact->c_iter.reset(new CompactionIterator(
      input.get(), cfd->user_comparator(), &merge, versions_->LastSequence(),
-      &existing_snapshots_, earliest_write_conflict_snapshot_,
-      snapshot_checker_, env_, false, range_del_agg.get(),
-      sub_compact->compaction, compaction_filter, shutting_down_,
-      preserve_deletes_seqnum_));
+      &existing_snapshots_, earliest_write_conflict_snapshot_, env_, false,
+      range_del_agg.get(), sub_compact->compaction, compaction_filter,
+      comp_event_listener, shutting_down_));
  auto c_iter = sub_compact->c_iter.get();
  c_iter->SeekToFirst();
  if (c_iter->Valid() &&
@@ -783,11 +768,11 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
  }
  const auto& c_iter_stats = c_iter->iter_stats();
  auto sample_begin_offset_iter = sample_begin_offsets.cbegin();
-  // data_begin_offset and dict_sample_data are only valid while generating
+  // data_begin_offset and compression_dict are only valid while generating
  // dictionary from the first output file.
  size_t data_begin_offset = 0;
-  std::string dict_sample_data;
-  dict_sample_data.reserve(kSampleBytes);
+  std::string compression_dict;
+  compression_dict.reserve(cfd->ioptions()->compression_opts.max_dict_bytes);

  while (status.ok() && !cfd->IsDropped() && c_iter->Valid()) {
    // Invariant: c_iter.status() is guaranteed to be OK if c_iter->Valid()
@@ -859,7 +844,7 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
            data_elmt_copy_len =
                data_end_offset - (data_begin_offset + data_elmt_copy_offset);
          }
-          dict_sample_data.append(&data_elmt.data()[data_elmt_copy_offset],
+          compression_dict.append(&data_elmt.data()[data_elmt_copy_offset],
                                  data_elmt_copy_len);
          if (sample_end_offset > data_end_offset) {
            // Didn't finish sample. Try to finish it with the next data_elmt.
@@ -914,15 +899,9 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
      RecordDroppedKeys(range_del_out_stats,
                        &sub_compact->compaction_job_stats);
      if (sub_compact->outputs.size() == 1) {
-        // Use samples from first output file to create dictionary for
-        // compression of subsequent files.
-        if (kUseZstdTrainer) {
-          sub_compact->compression_dict = ZSTD_TrainDictionary(
-              dict_sample_data, kSampleLenShift,
-              cfd->ioptions()->compression_opts.max_dict_bytes);
-        } else {
-          sub_compact->compression_dict = std::move(dict_sample_data);
-        }
+        // Use dictionary from first output file for compression of subsequent
+        // files.
+        sub_compact->compression_dict = std::move(compression_dict);
      }
    }
  }
@@ -1027,10 +1006,6 @@ void CompactionJob::RecordDroppedKeys(
    RecordTick(stats_, COMPACTION_RANGE_DEL_DROP_OBSOLETE,
               c_iter_stats.num_range_del_drop_obsolete);
  }
-  if (c_iter_stats.num_optimized_del_drop_obsolete > 0) {
-    RecordTick(stats_, COMPACTION_OPTIMIZED_DEL_DROP_OBSOLETE,
-               c_iter_stats.num_optimized_del_drop_obsolete);
-  }
 }

 Status CompactionJob::FinishCompactionOutputFile(
@@ -1048,12 +1023,12 @@ Status CompactionJob::FinishCompactionOutputFile(
  uint64_t output_number = sub_compact->current_output()->meta.fd.GetNumber();
  assert(output_number != 0);

+  TableProperties table_properties;
  // Check for iterator errors
  Status s = input_status;
  auto meta = &sub_compact->current_output()->meta;
  if (s.ok()) {
    Slice lower_bound_guard, upper_bound_guard;
-    std::string smallest_user_key;
    const Slice *lower_bound, *upper_bound;
    if (sub_compact->outputs.size() == 1) {
      // For the first output table, include range tombstones before the min key
@@ -1063,8 +1038,7 @@ Status CompactionJob::FinishCompactionOutputFile(
      // For subsequent output tables, only include range tombstones from min
      // key onwards since the previous file was extended to contain range
      // tombstones falling before min key.
-      smallest_user_key = meta->smallest.user_key().ToString(false /*hex*/);
-      lower_bound_guard = Slice(smallest_user_key);
+      lower_bound_guard = meta->smallest.user_key();
      lower_bound = &lower_bound_guard;
    } else {
      lower_bound = nullptr;
@@ -1082,18 +1056,16 @@ Status CompactionJob::FinishCompactionOutputFile(
    range_del_agg->AddToBuilder(sub_compact->builder.get(), lower_bound,
                                upper_bound, meta, range_del_out_stats,
                                bottommost_level_);
-    meta->marked_for_compaction = sub_compact->builder->NeedCompact();
  }
  const uint64_t current_entries = sub_compact->builder->NumEntries();
+  meta->marked_for_compaction = sub_compact->builder->NeedCompact();
  if (s.ok()) {
    s = sub_compact->builder->Finish();
  } else {
    sub_compact->builder->Abandon();
  }
  const uint64_t current_bytes = sub_compact->builder->FileSize();
-  if (s.ok()) {
-    meta->fd.file_size = current_bytes;
-  }
+  meta->fd.file_size = current_bytes;
  sub_compact->current_output()->finished = true;
  sub_compact->total_bytes += current_bytes;

@@ -1107,23 +1079,6 @@ Status CompactionJob::FinishCompactionOutputFile(
  }
  sub_compact->outfile.reset();

-  if (s.ok() && current_entries == 0) {
-    // If there is nothing to output, no necessary to generate a sst file.
-    // This happens when the output level is bottom level, at the same time
-    // the sub_compact output nothing.
-    std::string fname = TableFileName(
-        db_options_.db_paths, meta->fd.GetNumber(), meta->fd.GetPathId());
-    env_->DeleteFile(fname);
-
-    // Also need to remove the file from outputs, or it will be added to the
-    // VersionEdit.
-    assert(!sub_compact->outputs.empty());
-    sub_compact->outputs.pop_back();
-    sub_compact->builder.reset();
-    sub_compact->current_output_file_size = 0;
-    return s;
-  }
-
  ColumnFamilyData* cfd = sub_compact->compaction->column_family_data();
  TableProperties tp;
  if (s.ok() && current_entries > 0) {
@@ -1138,8 +1093,7 @@ Status CompactionJob::FinishCompactionOutputFile(
        nullptr /* range_del_agg */, nullptr,
        cfd->internal_stats()->GetFileReadHist(
            compact_->compaction->output_level()),
-        false, nullptr /* arena */, false /* skip_filters */,
-        compact_->compaction->output_level());
+        false);
    s = iter->status();

    if (s.ok() && paranoid_file_checks_) {
@@ -1162,44 +1116,27 @@ Status CompactionJob::FinishCompactionOutputFile(
                     meta->marked_for_compaction ? " (need compaction)" : "");
    }
  }
-  std::string fname;
-  FileDescriptor output_fd;
-  if (meta != nullptr) {
-    fname = TableFileName(db_options_.db_paths, meta->fd.GetNumber(),
-                          meta->fd.GetPathId());
-    output_fd = meta->fd;
-  } else {
-    fname = "(nil)";
-  }
+  std::string fname = TableFileName(db_options_.db_paths, meta->fd.GetNumber(),
+                                    meta->fd.GetPathId());
  EventHelpers::LogAndNotifyTableFileCreationFinished(
      event_logger_, cfd->ioptions()->listeners, dbname_, cfd->GetName(), fname,
-      job_id_, output_fd, tp, TableFileCreationReason::kCompaction, s);
+      job_id_, meta->fd, tp, TableFileCreationReason::kCompaction, s);

 #ifndef ROCKSDB_LITE
  // Report new file to SstFileManagerImpl
  auto sfm =
      static_cast<SstFileManagerImpl*>(db_options_.sst_file_manager.get());
-  if (sfm && meta != nullptr && meta->fd.GetPathId() == 0) {
+  if (sfm && meta->fd.GetPathId() == 0) {
    auto fn = TableFileName(cfd->ioptions()->db_paths, meta->fd.GetNumber(),
                            meta->fd.GetPathId());
    sfm->OnAddFile(fn);
    if (sfm->IsMaxAllowedSpaceReached()) {
-      // TODO(ajkr): should we return OK() if max space was reached by the final
-      // compaction output file (similarly to how flush works when full)?
-      s = Status::IOError("Max allowed space was reached");
-      TEST_SYNC_POINT(
-          "CompactionJob::FinishCompactionOutputFile:"
-          "MaxAllowedSpaceReached");
      InstrumentedMutexLock l(db_mutex_);
      if (db_bg_error_->ok()) {
-        Status new_bg_error = s;
-        // may temporarily unlock and lock the mutex.
-        EventHelpers::NotifyOnBackgroundError(
-            cfd->ioptions()->listeners, BackgroundErrorReason::kCompaction,
-            &new_bg_error, db_mutex_);
-        if (!new_bg_error.ok()) {
-          *db_bg_error_ = new_bg_error;
-        }
+        s = Status::IOError("Max allowed space was reached");
+        *db_bg_error_ = s;
+        TEST_SYNC_POINT(
+            "CompactionJob::FinishCompactionOutputFile:MaxAllowedSpaceReached");
      }
    }
  }
@@ -1277,12 +1214,11 @@ Status CompactionJob::OpenCompactionOutputFile(
 #endif  // !ROCKSDB_LITE
  // Make the output file
  unique_ptr<WritableFile> writable_file;
-#ifndef NDEBUG
-  bool syncpoint_arg = env_options_.use_direct_writes;
+  EnvOptions opt_env_opts =
+      env_->OptimizeForCompactionTableWrite(env_options_, db_options_);
  TEST_SYNC_POINT_CALLBACK("CompactionJob::OpenCompactionOutputFile",
-                           &syncpoint_arg);
-#endif
-  Status s = NewWritableFile(env_, fname, &writable_file, env_options_);
+                           &opt_env_opts.use_direct_writes);
+  Status s = NewWritableFile(env_, fname, &writable_file, opt_env_opts);
  if (!s.ok()) {
    ROCKS_LOG_ERROR(
        db_options_.info_log,
@@ -1305,7 +1241,6 @@ Status CompactionJob::OpenCompactionOutputFile(

  sub_compact->outputs.push_back(out);
  writable_file->SetIOPriority(Env::IO_LOW);
-  writable_file->SetWriteLifeTimeHint(write_hint_);
  writable_file->SetPreallocationBlockSize(static_cast<size_t>(
      sub_compact->compaction->OutputFilePreallocationSize()));
  sub_compact->outfile.reset(new WritableFileWriter(
@@ -1316,30 +1251,14 @@ Status CompactionJob::OpenCompactionOutputFile(
  // data is going to be found
  bool skip_filters =
      cfd->ioptions()->optimize_filters_for_hits && bottommost_level_;
-
-  uint64_t output_file_creation_time =
-      sub_compact->compaction->MaxInputFileCreationTime();
-  if (output_file_creation_time == 0) {
-    int64_t _current_time = 0;
-    auto status = db_options_.env->GetCurrentTime(&_current_time);
-    // Safe to proceed even if GetCurrentTime fails. So, log and proceed.
-    if (!status.ok()) {
-      ROCKS_LOG_WARN(
-          db_options_.info_log,
-          "Failed to get current time to populate creation_time property. "
-          "Status: %s",
-          status.ToString().c_str());
-    }
-    output_file_creation_time = static_cast<uint64_t>(_current_time);
-  }
-
  sub_compact->builder.reset(NewTableBuilder(
      *cfd->ioptions(), cfd->internal_comparator(),
      cfd->int_tbl_prop_collector_factories(), cfd->GetID(), cfd->GetName(),
      sub_compact->outfile.get(), sub_compact->compaction->output_compression(),
      cfd->ioptions()->compression_opts,
-      sub_compact->compaction->output_level(), &sub_compact->compression_dict,
-      skip_filters, output_file_creation_time));
+      sub_compact->compaction->output_level(),
+      &sub_compact->compression_dict,
+      skip_filters));
  LogFlush(db_options_.info_log);
  return s;
 }
@@ -45,28 +45,24 @@

 namespace rocksdb {

-class Arena;
 class MemTable;
-class SnapshotChecker;
 class TableCache;
 class Version;
 class VersionEdit;
 class VersionSet;
+class Arena;

 class CompactionJob {
 public:
  CompactionJob(int job_id, Compaction* compaction,
                const ImmutableDBOptions& db_options,
-                const EnvOptions env_options, VersionSet* versions,
-                const std::atomic<bool>* shutting_down,
-                const SequenceNumber preserve_deletes_seqnum,
-                LogBuffer* log_buffer,
+                const EnvOptions& env_options, VersionSet* versions,
+                const std::atomic<bool>* shutting_down, LogBuffer* log_buffer,
                Directory* db_directory, Directory* output_directory,
                Statistics* stats, InstrumentedMutex* db_mutex,
                Status* db_bg_error,
                std::vector<SequenceNumber> existing_snapshots,
                SequenceNumber earliest_write_conflict_snapshot,
-                const SnapshotChecker* snapshot_checker,
                std::shared_ptr<Cache> table_cache, EventLogger* event_logger,
                bool paranoid_file_checks, bool measure_io_stats,
                const std::string& dbname,
@@ -131,14 +127,11 @@ class CompactionJob {
  // DBImpl state
  const std::string& dbname_;
  const ImmutableDBOptions& db_options_;
-  const EnvOptions env_options_;
+  const EnvOptions& env_options_;

  Env* env_;
-  // env_option optimized for compaction table reads
-  EnvOptions env_optiosn_for_read_;
  VersionSet* versions_;
  const std::atomic<bool>* shutting_down_;
-  const SequenceNumber preserve_deletes_seqnum_;
  LogBuffer* log_buffer_;
  Directory* db_directory_;
  Directory* output_directory_;
@@ -156,8 +149,6 @@ class CompactionJob {
  // should make sure not to remove evidence that a write occurred.
  SequenceNumber earliest_write_conflict_snapshot_;

-  const SnapshotChecker* const snapshot_checker_;
-
  std::shared_ptr<Cache> table_cache_;

  EventLogger* event_logger_;
@@ -169,7 +160,6 @@ class CompactionJob {
  std::vector<Slice> boundaries_;
  // Stores the approx size of keys covered in the range of each subcompaction
  std::vector<uint64_t> sizes_;
-  Env::WriteLifeTimeHint write_hint_;
 };

 }  // namespace rocksdb
@@ -426,7 +426,7 @@ class CompactionJobStatsChecker : public EventListener {
  // Once a compaction completed, this function will verify the returned
  // CompactionJobInfo with the oldest CompactionJobInfo added earlier
  // in "expected_stats_" which has not yet being used for verification.
-  virtual void OnCompactionCompleted(DB* /*db*/, const CompactionJobInfo& ci) {
+  virtual void OnCompactionCompleted(DB *db, const CompactionJobInfo& ci) {
    if (verify_next_comp_io_stats_) {
      ASSERT_GT(ci.stats.file_write_nanos, 0);
      ASSERT_GT(ci.stats.file_range_sync_nanos, 0);
@@ -76,7 +76,6 @@ class CompactionJobTest : public testing::Test {
                                 table_cache_.get(), &write_buffer_manager_,
                                 &write_controller_)),
        shutting_down_(false),
-        preserve_deletes_seqnum_(0),
        mock_table_factory_(new mock::MockTableFactory()) {
    EXPECT_OK(env_->CreateDirIfMissing(dbname_));
    db_options_.db_paths.emplace_back(dbname_,
@@ -143,8 +142,6 @@ class CompactionJobTest : public testing::Test {
  }

  void SetLastSequence(const SequenceNumber sequence_number) {
-    versions_->SetLastAllocatedSequence(sequence_number + 1);
-    versions_->SetLastPublishedSequence(sequence_number + 1);
    versions_->SetLastSequence(sequence_number + 1);
  }

@@ -252,15 +249,12 @@ class CompactionJobTest : public testing::Test {
    LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL, db_options_.info_log.get());
    mutex_.Lock();
    EventLogger event_logger(db_options_.info_log.get());
-    // TODO(yiwu) add a mock snapshot checker and add test for it.
-    SnapshotChecker* snapshot_checker = nullptr;
-    CompactionJob compaction_job(0, &compaction, db_options_, env_options_,
-                                 versions_.get(), &shutting_down_,
-                                 preserve_deletes_seqnum_, &log_buffer,
-                                 nullptr, nullptr, nullptr, &mutex_, &bg_error_,
-                                 snapshots, earliest_write_conflict_snapshot,
-                                 snapshot_checker, table_cache_, &event_logger,
-                                 false, false, dbname_, &compaction_job_stats_);
+    CompactionJob compaction_job(
+        0, &compaction, db_options_, env_options_, versions_.get(),
+        &shutting_down_, &log_buffer, nullptr, nullptr, nullptr, &mutex_,
+        &bg_error_, snapshots, earliest_write_conflict_snapshot, table_cache_,
+        &event_logger, false, false, dbname_, &compaction_job_stats_);
+
    VerifyInitializationOfCompactionJobStats(compaction_job_stats_);

    compaction_job.Prepare();
@@ -296,7 +290,6 @@ class CompactionJobTest : public testing::Test {
  std::unique_ptr<VersionSet> versions_;
  InstrumentedMutex mutex_;
  std::atomic<bool> shutting_down_;
-  SequenceNumber preserve_deletes_seqnum_;
  std::shared_ptr<mock::MockTableFactory> mock_table_factory_;
  CompactionJobStats compaction_job_stats_;
  ColumnFamilyData* cfd_;
@@ -344,24 +337,6 @@ TEST_F(CompactionJobTest, SimpleDeletion) {
  RunCompaction({files}, expected_results);
 }

-TEST_F(CompactionJobTest, OutputNothing) {
-  NewDB();
-
-  auto file1 = mock::MakeMockFile({{KeyStr("a", 1U, kTypeValue), "val"}});
-
-  AddMockFile(file1);
-
-  auto file2 = mock::MakeMockFile({{KeyStr("a", 2U, kTypeDeletion), ""}});
-
-  AddMockFile(file2);
-
-  auto expected_results = mock::MakeMockFile();
-
-  SetLastSequence(4U);
-  auto files = cfd_->current()->storage_info()->LevelFiles(0);
-  RunCompaction({files}, expected_results);
-}
-
 TEST_F(CompactionJobTest, SimpleOverwrite) {
  NewDB();

@@ -41,7 +41,7 @@ bool FindIntraL0Compaction(const std::vector<FileMetaData*>& level_files,
                           size_t min_files_to_compact,
                           uint64_t max_compact_bytes_per_del_file,
                           CompactionInputFiles* comp_inputs) {
-  size_t compact_bytes = static_cast<size_t>(level_files[0]->fd.file_size);
+  size_t compact_bytes = level_files[0]->fd.file_size;
  size_t compact_bytes_per_del_file = port::kMaxSizet;
  // compaction range will be [0, span_len).
  size_t span_len;
@@ -89,7 +89,7 @@ CompressionType GetCompressionType(const ImmutableCFOptions& ioptions,
  // If bottommost_compression is set and we are compacting to the
  // bottommost level then we should use it.
  if (ioptions.bottommost_compression != kDisableCompressionOption &&
-      level >= (vstorage->num_non_empty_levels() - 1)) {
+      level > base_level && level >= (vstorage->num_non_empty_levels() - 1)) {
    return ioptions.bottommost_compression;
  }
  // If the user has specified a different compression level for each level,
@@ -199,7 +199,7 @@ void CompactionPicker::GetRange(const std::vector<CompactionInputFiles>& inputs,
  assert(initialized);
 }

-bool CompactionPicker::ExpandInputsToCleanCut(const std::string& /*cf_name*/,
+bool CompactionPicker::ExpandInputsToCleanCut(const std::string& cf_name,
                                              VersionStorageInfo* vstorage,
                                              CompactionInputFiles* inputs) {
  // This isn't good compaction
@@ -234,6 +234,11 @@ bool CompactionPicker::ExpandInputsToCleanCut(const std::string& /*cf_name*/,
  // If, after the expansion, there are files that are already under
  // compaction, then we must drop/cancel this compaction.
  if (AreFilesInCompaction(inputs->files)) {
+    ROCKS_LOG_WARN(
+        ioptions_.info_log,
+        "[%s] ExpandWhileOverlapping() failure because some of the necessary"
+        " compaction input files are currently being compacted.",
+        cf_name.c_str());
    return false;
  }
  return true;
@@ -292,16 +297,25 @@ Compaction* CompactionPicker::CompactFiles(
    VersionStorageInfo* vstorage, const MutableCFOptions& mutable_cf_options,
    uint32_t output_path_id) {
  assert(input_files.size());
-  // This compaction output should not overlap with a running compaction as
-  // `SanitizeCompactionInputFiles` should've checked earlier and db mutex
-  // shouldn't have been released since.
-  assert(!FilesRangeOverlapWithCompaction(input_files, output_level));

+  // TODO(rven ): we might be able to run concurrent level 0 compaction
+  // if the key ranges of the two compactions do not overlap, but for now
+  // we do not allow it.
+  if ((input_files[0].level == 0) && !level0_compactions_in_progress_.empty()) {
+    return nullptr;
+  }
+  // This compaction output could overlap with a running compaction
+  if (FilesRangeOverlapWithCompaction(input_files, output_level)) {
+    return nullptr;
+  }
  auto c =
      new Compaction(vstorage, ioptions_, mutable_cf_options, input_files,
                     output_level, compact_options.output_file_size_limit,
                     mutable_cf_options.max_compaction_bytes, output_path_id,
                     compact_options.compression, /* grandparents */ {}, true);
+
+  // If it's level 0 compaction, make sure we don't execute any other level 0
+  // compactions in parallel
  RegisterCompaction(c);
  return c;
 }
@@ -309,7 +323,7 @@ Compaction* CompactionPicker::CompactFiles(
 Status CompactionPicker::GetCompactionInputsFromFileNumbers(
    std::vector<CompactionInputFiles>* input_files,
    std::unordered_set<uint64_t>* input_set, const VersionStorageInfo* vstorage,
-    const CompactionOptions& /*compact_options*/) const {
+    const CompactionOptions& compact_options) const {
  if (input_set->size() == 0U) {
    return Status::InvalidArgument(
        "Compaction must include at least one file.");
@@ -387,10 +401,7 @@ bool CompactionPicker::SetupOtherInputs(
  assert(output_level_inputs->empty());
  const int input_level = inputs->level;
  const int output_level = output_level_inputs->level;
-  if (input_level == output_level) {
-    // no possibility of conflict
-    return true;
-  }
+  assert(input_level != output_level);

  // For now, we only support merging two levels, start level and output level.
  // We need to assert other levels are empty.
@@ -724,6 +735,10 @@ Status CompactionPicker::SanitizeCompactionInputFilesForAllLevels(
  auto& levels = cf_meta.levels;
  auto comparator = icmp_->user_comparator();

+  // TODO(yhchiang): If there is any input files of L1 or up and there
+  // is at least one L0 files. All L0 files older than the L0 file needs
+  // to be included. Otherwise, it is a false conditoin
+
  // TODO(yhchiang): add is_adjustable to CompactionOptions

  // the smallest and largest key of the current compaction input
@@ -784,8 +799,6 @@ Status CompactionPicker::SanitizeCompactionInputFilesForAllLevels(
        }
        last_included++;
      }
-    } else if (output_level > 0) {
-      last_included = static_cast<int>(current_files.size() - 1);
    }

    // include all files between the first and the last compaction input files.
@@ -941,9 +954,6 @@ void CompactionPicker::UnregisterCompaction(Compaction* c) {

 bool LevelCompactionPicker::NeedsCompaction(
    const VersionStorageInfo* vstorage) const {
-  if (!vstorage->BottommostFilesMarkedForCompaction().empty()) {
-    return true;
-  }
  if (!vstorage->FilesMarkedForCompaction().empty()) {
    return true;
  }
@@ -1096,7 +1106,11 @@ void LevelCompactionBuilder::SetupInitialFiles() {
      }
      output_level_ =
          (start_level_ == 0) ? vstorage_->base_level() : start_level_ + 1;
-      if (PickFileToCompact()) {
+      if (PickFileToCompact() &&
+          compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_,
+                                                     &start_level_inputs_) &&
+          !compaction_picker_->FilesRangeOverlapWithCompaction(
+              {start_level_inputs_}, output_level_)) {
        // found the compaction!
        if (start_level_ == 0) {
          // L0 score = `num L0 files` / `level0_file_num_compaction_trigger`
@@ -1134,28 +1148,7 @@ void LevelCompactionBuilder::SetupInitialFiles() {
    is_manual_ = true;
    parent_index_ = base_index_ = -1;
    PickFilesMarkedForCompaction();
-    if (start_level_inputs_.empty()) {
-      size_t i;
-      for (i = 0; i < vstorage_->BottommostFilesMarkedForCompaction().size();
-           ++i) {
-        auto& level_and_file =
-            vstorage_->BottommostFilesMarkedForCompaction()[i];
-        assert(!level_and_file.second->being_compacted);
-        start_level_inputs_.level = output_level_ = start_level_ =
-            level_and_file.first;
-        start_level_inputs_.files = {level_and_file.second};
-        if (compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_,
-                                                       &start_level_inputs_)) {
-          break;
-        }
-      }
-      if (i == vstorage_->BottommostFilesMarkedForCompaction().size()) {
-        start_level_inputs_.clear();
-      } else {
-        assert(!start_level_inputs_.empty());
-        compaction_reason_ = CompactionReason::kBottommostFiles;
-      }
-    } else {
+    if (!start_level_inputs_.empty()) {
      compaction_reason_ = CompactionReason::kFilesMarkedForCompaction;
    }
  }
@@ -1295,8 +1288,6 @@ uint32_t LevelCompactionBuilder::GetPathId(
  uint64_t level_size;
  int cur_level = 0;

-  // max_bytes_for_level_base denotes L1 size.
-  // We estimate L0 size to be the same as L1.
  level_size = mutable_cf_options.max_bytes_for_level_base;

  // Last path is the fallback
@@ -1307,21 +1298,8 @@ uint32_t LevelCompactionBuilder::GetPathId(
        return p;
      } else {
        current_path_size -= level_size;
-        if (cur_level > 0) {
-          if (ioptions.level_compaction_dynamic_level_bytes) {
-            // Currently, level_compaction_dynamic_level_bytes is ignored when
-            // multiple db paths are specified. https://github.com/facebook/
-            // rocksdb/blob/master/db/column_family.cc.
-            // Still, adding this check to avoid accidentally using
-            // max_bytes_for_level_multiplier_additional
-            level_size = static_cast<uint64_t>(
-                level_size * mutable_cf_options.max_bytes_for_level_multiplier);
-          } else {
-            level_size = static_cast<uint64_t>(
-                level_size * mutable_cf_options.max_bytes_for_level_multiplier *
-                mutable_cf_options.MaxBytesMultiplerAdditional(cur_level));
-          }
-        }
+        level_size = static_cast<uint64_t>(
+            level_size * mutable_cf_options.max_bytes_for_level_multiplier);
        cur_level++;
        continue;
      }
@@ -1354,10 +1332,12 @@ bool LevelCompactionBuilder::PickFileToCompact() {
  const std::vector<FileMetaData*>& level_files =
      vstorage_->LevelFiles(start_level_);

-  unsigned int cmp_idx;
-  for (cmp_idx = vstorage_->NextCompactionIndex(start_level_);
-       cmp_idx < file_size.size(); cmp_idx++) {
-    int index = file_size[cmp_idx];
+  // record the first file that is not yet compacted
+  int nextIndex = -1;
+
+  for (unsigned int i = vstorage_->NextCompactionIndex(start_level_);
+       i < file_size.size(); i++) {
+    int index = file_size[i];
    auto* f = level_files[index];

    // do not pick a file to compact if it is being compacted
@@ -1366,42 +1346,27 @@ bool LevelCompactionBuilder::PickFileToCompact() {
      continue;
    }

-    start_level_inputs_.files.push_back(f);
-    start_level_inputs_.level = start_level_;
-    if (!compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_,
-                                                    &start_level_inputs_) ||
-        compaction_picker_->FilesRangeOverlapWithCompaction(
-            {start_level_inputs_}, output_level_)) {
-      // A locked (pending compaction) input-level file was pulled in due to
-      // user-key overlap.
-      start_level_inputs_.clear();
-      continue;
+    // remember the startIndex for the next call to PickCompaction
+    if (nextIndex == -1) {
+      nextIndex = i;
    }

-    // Now that input level is fully expanded, we check whether any output files
-    // are locked due to pending compaction.
-    //
-    // Note we rely on ExpandInputsToCleanCut() to tell us whether any output-
-    // level files are locked, not just the extra ones pulled in for user-key
-    // overlap.
-    InternalKey smallest, largest;
-    compaction_picker_->GetRange(start_level_inputs_, &smallest, &largest);
-    CompactionInputFiles output_level_inputs;
-    output_level_inputs.level = output_level_;
-    vstorage_->GetOverlappingInputs(output_level_, &smallest, &largest,
-                                    &output_level_inputs.files);
-    if (!output_level_inputs.empty() &&
-        !compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_,
-                                                    &output_level_inputs)) {
-      start_level_inputs_.clear();
+    // Do not pick this file if its parents at level+1 are being compacted.
+    // Maybe we can avoid redoing this work in SetupOtherInputs
+    parent_index_ = -1;
+    if (compaction_picker_->IsRangeInCompaction(vstorage_, &f->smallest,
+                                                &f->largest, output_level_,
+                                                &parent_index_)) {
      continue;
    }
+    start_level_inputs_.files.push_back(f);
+    start_level_inputs_.level = start_level_;
    base_index_ = index;
    break;
  }

  // store where to start the iteration in the next call to PickCompaction
-  vstorage_->SetNextCompactionIndex(start_level_, cmp_idx);
+  vstorage_->SetNextCompactionIndex(start_level_, nextIndex);

  return start_level_inputs_.size() > 0;
 }
@@ -1438,97 +1403,21 @@ bool FIFOCompactionPicker::NeedsCompaction(
  return vstorage->CompactionScore(kLevel0) >= 1;
 }

-namespace {
-uint64_t GetTotalFilesSize(
-    const std::vector<FileMetaData*>& files) {
+Compaction* FIFOCompactionPicker::PickCompaction(
+    const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
+    VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
+  assert(vstorage->num_levels() == 1);
+  const int kLevel0 = 0;
+  const std::vector<FileMetaData*>& level_files = vstorage->LevelFiles(kLevel0);
  uint64_t total_size = 0;
-  for (const auto& f : files) {
-    total_size += f->fd.file_size;
-  }
-  return total_size;
-}
-}  // anonymous namespace
-
-Compaction* FIFOCompactionPicker::PickTTLCompaction(
-    const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
-    VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
-  assert(mutable_cf_options.compaction_options_fifo.ttl > 0);
-
-  const int kLevel0 = 0;
-  const std::vector<FileMetaData*>& level_files = vstorage->LevelFiles(kLevel0);
-  uint64_t total_size = GetTotalFilesSize(level_files);
-
-  int64_t _current_time;
-  auto status = ioptions_.env->GetCurrentTime(&_current_time);
-  if (!status.ok()) {
-    ROCKS_LOG_BUFFER(log_buffer,
-                     "[%s] FIFO compaction: Couldn't get current time: %s. "
-                     "Not doing compactions based on TTL. ",
-                     cf_name.c_str(), status.ToString().c_str());
-    return nullptr;
-  }
-  const uint64_t current_time = static_cast<uint64_t>(_current_time);
-
-  std::vector<CompactionInputFiles> inputs;
-  inputs.emplace_back();
-  inputs[0].level = 0;
-
-  // avoid underflow
-  if (current_time > mutable_cf_options.compaction_options_fifo.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 =
-            f->fd.table_reader->GetTableProperties()->creation_time;
-        if (creation_time == 0 ||
-            creation_time >= (current_time -
-                              mutable_cf_options.compaction_options_fifo.ttl)) {
-          break;
-        }
-        total_size -= f->compensated_file_size;
-        inputs[0].files.push_back(f);
-      }
-    }
+  for (const auto& file : level_files) {
+    total_size += file->fd.file_size;
  }

-  // Return a nullptr and proceed to size-based FIFO compaction if:
-  // 1. there are no files older than ttl OR
-  // 2. there are a few files older than ttl, but deleting them will not bring
-  //    the total size to be less than max_table_files_size threshold.
-  if (inputs[0].files.empty() ||
-      total_size >
-          mutable_cf_options.compaction_options_fifo.max_table_files_size) {
-    return nullptr;
-  }
-
-  for (const auto& f : inputs[0].files) {
-    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);
-  }
-
-  Compaction* c = new Compaction(
-      vstorage, ioptions_, mutable_cf_options, std::move(inputs), 0, 0, 0, 0,
-      kNoCompression, {}, /* is manual */ false, vstorage->CompactionScore(0),
-      /* is deletion compaction */ true, CompactionReason::kFIFOTtl);
-  return c;
-}
-
-Compaction* FIFOCompactionPicker::PickSizeCompaction(
-    const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
-    VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
-  const int kLevel0 = 0;
-  const std::vector<FileMetaData*>& level_files = vstorage->LevelFiles(kLevel0);
-  uint64_t total_size = GetTotalFilesSize(level_files);
-
-  if (total_size <=
-          mutable_cf_options.compaction_options_fifo.max_table_files_size ||
+  if (total_size <= ioptions_.compaction_options_fifo.max_table_files_size ||
      level_files.size() == 0) {
    // total size not exceeded
-    if (mutable_cf_options.compaction_options_fifo.allow_compaction &&
+    if (ioptions_.compaction_options_fifo.allow_compaction &&
        level_files.size() > 0) {
      CompactionInputFiles comp_inputs;
      if (FindIntraL0Compaction(
@@ -1544,16 +1433,16 @@ Compaction* FIFOCompactionPicker::PickSizeCompaction(
            /* is manual */ false, vstorage->CompactionScore(0),
            /* is deletion compaction */ false,
            CompactionReason::kFIFOReduceNumFiles);
+        RegisterCompaction(c);
        return c;
      }
    }

-    ROCKS_LOG_BUFFER(
-        log_buffer,
-        "[%s] FIFO compaction: nothing to do. Total size %" PRIu64
-        ", max size %" PRIu64 "\n",
-        cf_name.c_str(), total_size,
-        mutable_cf_options.compaction_options_fifo.max_table_files_size);
+    ROCKS_LOG_BUFFER(log_buffer,
+                     "[%s] FIFO compaction: nothing to do. Total size %" PRIu64
+                     ", max size %" PRIu64 "\n",
+                     cf_name.c_str(), total_size,
+                     ioptions_.compaction_options_fifo.max_table_files_size);
    return nullptr;
  }

@@ -1569,42 +1458,24 @@ Compaction* FIFOCompactionPicker::PickSizeCompaction(
  std::vector<CompactionInputFiles> inputs;
  inputs.emplace_back();
  inputs[0].level = 0;
-
+  // delete old files (FIFO)
  for (auto ritr = level_files.rbegin(); ritr != level_files.rend(); ++ritr) {
    auto f = *ritr;
    total_size -= f->compensated_file_size;
    inputs[0].files.push_back(f);
    char tmp_fsize[16];
    AppendHumanBytes(f->fd.GetFileSize(), tmp_fsize, sizeof(tmp_fsize));
-    ROCKS_LOG_BUFFER(log_buffer,
-                     "[%s] FIFO compaction: picking file %" PRIu64
-                     " with size %s for deletion",
+    ROCKS_LOG_BUFFER(log_buffer, "[%s] FIFO compaction: picking file %" PRIu64
+                                 " with size %s for deletion",
                     cf_name.c_str(), f->fd.GetNumber(), tmp_fsize);
-    if (total_size <=
-        mutable_cf_options.compaction_options_fifo.max_table_files_size) {
+    if (total_size <= ioptions_.compaction_options_fifo.max_table_files_size) {
      break;
    }
  }
-
  Compaction* c = new Compaction(
      vstorage, ioptions_, mutable_cf_options, std::move(inputs), 0, 0, 0, 0,
      kNoCompression, {}, /* is manual */ false, vstorage->CompactionScore(0),
      /* is deletion compaction */ true, CompactionReason::kFIFOMaxSize);
-  return c;
-}
-
-Compaction* FIFOCompactionPicker::PickCompaction(
-    const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
-    VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
-  assert(vstorage->num_levels() == 1);
-
-  Compaction* c = nullptr;
-  if (mutable_cf_options.compaction_options_fifo.ttl > 0) {
-    c = PickTTLCompaction(cf_name, mutable_cf_options, vstorage, log_buffer);
-  }
-  if (c == nullptr) {
-    c = PickSizeCompaction(cf_name, mutable_cf_options, vstorage, log_buffer);
-  }
  RegisterCompaction(c);
  return c;
 }
@@ -1612,9 +1483,8 @@ Compaction* FIFOCompactionPicker::PickCompaction(
 Compaction* FIFOCompactionPicker::CompactRange(
    const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
    VersionStorageInfo* vstorage, int input_level, int output_level,
-    uint32_t /*output_path_id*/, const InternalKey* /*begin*/,
-    const InternalKey* /*end*/, InternalKey** compaction_end,
-    bool* /*manual_conflict*/) {
+    uint32_t output_path_id, const InternalKey* begin, const InternalKey* end,
+    InternalKey** compaction_end, bool* manual_conflict) {
  assert(input_level == 0);
  assert(output_level == 0);
  *compaction_end = nullptr;
@@ -88,10 +88,6 @@ class CompactionPicker {

  // Takes a list of CompactionInputFiles and returns a (manual) Compaction
  // object.
-  //
-  // Caller must provide a set of input files that has been passed through
-  // `SanitizeCompactionInputFiles` earlier. The lock should not be released
-  // between that call and this one.
  Compaction* CompactFiles(const CompactionOptions& compact_options,
                           const std::vector<CompactionInputFiles>& input_files,
                           int output_level, VersionStorageInfo* vstorage,
@@ -246,17 +242,6 @@ class FIFOCompactionPicker : public CompactionPicker {

  virtual bool NeedsCompaction(
      const VersionStorageInfo* vstorage) const override;
-
- private:
-  Compaction* PickTTLCompaction(const std::string& cf_name,
-                                const MutableCFOptions& mutable_cf_options,
-                                VersionStorageInfo* version,
-                                LogBuffer* log_buffer);
-
-  Compaction* PickSizeCompaction(const std::string& cf_name,
-                                 const MutableCFOptions& mutable_cf_options,
-                                 VersionStorageInfo* version,
-                                 LogBuffer* log_buffer);
 };

 class NullCompactionPicker : public CompactionPicker {
@@ -267,29 +252,27 @@ class NullCompactionPicker : public CompactionPicker {
  virtual ~NullCompactionPicker() {}

  // Always return "nullptr"
-  Compaction* PickCompaction(const std::string& /*cf_name*/,
-                             const MutableCFOptions& /*mutable_cf_options*/,
-                             VersionStorageInfo* /*vstorage*/,
-                             LogBuffer* /*log_buffer*/) override {
+  Compaction* PickCompaction(const std::string& cf_name,
+                             const MutableCFOptions& mutable_cf_options,
+                             VersionStorageInfo* vstorage,
+                             LogBuffer* log_buffer) override {
    return nullptr;
  }

  // Always return "nullptr"
-  Compaction* CompactRange(const std::string& /*cf_name*/,
-                           const MutableCFOptions& /*mutable_cf_options*/,
-                           VersionStorageInfo* /*vstorage*/,
-                           int /*input_level*/, int /*output_level*/,
-                           uint32_t /*output_path_id*/,
-                           const InternalKey* /*begin*/,
-                           const InternalKey* /*end*/,
-                           InternalKey** /*compaction_end*/,
-                           bool* /*manual_conflict*/) override {
+  Compaction* CompactRange(const std::string& cf_name,
+                           const MutableCFOptions& mutable_cf_options,
+                           VersionStorageInfo* vstorage, int input_level,
+                           int output_level, uint32_t output_path_id,
+                           const InternalKey* begin, const InternalKey* end,
+                           InternalKey** compaction_end,
+                           bool* manual_conflict) override {
    return nullptr;
  }

  // Always returns false.
  virtual bool NeedsCompaction(
-      const VersionStorageInfo* /*vstorage*/) const override {
+      const VersionStorageInfo* vstorage) const override {
    return false;
  }
 };
@@ -20,9 +20,7 @@ namespace rocksdb {
 class CountingLogger : public Logger {
 public:
  using Logger::Logv;
-  virtual void Logv(const char* /*format*/, va_list /*ap*/) override {
-    log_count++;
-  }
+  virtual void Logv(const char* format, va_list ap) override { log_count++; }
  size_t log_count;
 };

@@ -177,8 +175,6 @@ TEST_F(CompactionPickerTest, Level1Trigger) {
 }

 TEST_F(CompactionPickerTest, Level1Trigger2) {
-  mutable_cf_options_.target_file_size_base = 10000000000;
-  mutable_cf_options_.RefreshDerivedOptions(ioptions_);
  NewVersionStorage(6, kCompactionStyleLevel);
  Add(1, 66U, "150", "200", 1000000001U);
  Add(1, 88U, "201", "300", 1000000000U);
@@ -195,14 +191,13 @@ TEST_F(CompactionPickerTest, Level1Trigger2) {
  ASSERT_EQ(66U, compaction->input(0, 0)->fd.GetNumber());
  ASSERT_EQ(6U, compaction->input(1, 0)->fd.GetNumber());
  ASSERT_EQ(7U, compaction->input(1, 1)->fd.GetNumber());
-  ASSERT_EQ(uint64_t{1073741824}, compaction->OutputFilePreallocationSize());
 }

 TEST_F(CompactionPickerTest, LevelMaxScore) {
  NewVersionStorage(6, kCompactionStyleLevel);
  mutable_cf_options_.target_file_size_base = 10000000;
+  mutable_cf_options_.target_file_size_multiplier = 10;
  mutable_cf_options_.max_bytes_for_level_base = 10 * 1024 * 1024;
-  mutable_cf_options_.RefreshDerivedOptions(ioptions_);
  Add(0, 1U, "150", "200", 1000000U);
  // Level 1 score 1.2
  Add(1, 66U, "150", "200", 6000000U);
@@ -223,9 +218,6 @@ TEST_F(CompactionPickerTest, LevelMaxScore) {
  ASSERT_TRUE(compaction.get() != nullptr);
  ASSERT_EQ(1U, compaction->num_input_files(0));
  ASSERT_EQ(7U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(mutable_cf_options_.target_file_size_base +
-                mutable_cf_options_.target_file_size_base / 10,
-            compaction->OutputFilePreallocationSize());
 }

 TEST_F(CompactionPickerTest, NeedsCompactionLevel) {
@@ -445,7 +437,7 @@ TEST_F(CompactionPickerTest, CompactionUniversalIngestBehindReservedLevel) {
 TEST_F(CompactionPickerTest, CannotTrivialMoveUniversal) {
  const uint64_t kFileSize = 100000;

-  mutable_cf_options_.compaction_options_universal.allow_trivial_move = true;
+  ioptions_.compaction_options_universal.allow_trivial_move = true;
  NewVersionStorage(1, kCompactionStyleUniversal);
  UniversalCompactionPicker universal_compaction_picker(ioptions_, &icmp_);
  // must return false when there's no files.
@@ -476,7 +468,7 @@ TEST_F(CompactionPickerTest, CannotTrivialMoveUniversal) {
 TEST_F(CompactionPickerTest, AllowsTrivialMoveUniversal) {
  const uint64_t kFileSize = 100000;

-  mutable_cf_options_.compaction_options_universal.allow_trivial_move = true;
+  ioptions_.compaction_options_universal.allow_trivial_move = true;
  UniversalCompactionPicker universal_compaction_picker(ioptions_, &icmp_);

  NewVersionStorage(3, kCompactionStyleUniversal);
@@ -504,7 +496,7 @@ TEST_F(CompactionPickerTest, NeedsCompactionFIFO) {
  const uint64_t kMaxSize = kFileSize * kFileCount / 2;

  fifo_options_.max_table_files_size = kMaxSize;
-  mutable_cf_options_.compaction_options_fifo = fifo_options_;
+  ioptions_.compaction_options_fifo = fifo_options_;
  FIFOCompactionPicker fifo_compaction_picker(ioptions_, &icmp_);
  UpdateVersionStorageInfo();
  // must return false when there's no files.
@@ -520,7 +512,7 @@ TEST_F(CompactionPickerTest, NeedsCompactionFIFO) {
        kFileSize, 0, i * 100, i * 100 + 99);
    current_size += kFileSize;
    UpdateVersionStorageInfo();
-    ASSERT_EQ(fifo_compaction_picker.NeedsCompaction(vstorage_.get()),
+    ASSERT_EQ(level_compaction_picker.NeedsCompaction(vstorage_.get()),
              vstorage_->CompactionScore(0) >= 1);
  }
 }
@@ -529,10 +521,9 @@ TEST_F(CompactionPickerTest, NeedsCompactionFIFO) {
 TEST_F(CompactionPickerTest, CompactionPriMinOverlapping1) {
  NewVersionStorage(6, kCompactionStyleLevel);
  ioptions_.compaction_pri = kMinOverlappingRatio;
-  mutable_cf_options_.target_file_size_base = 100000000000;
+  mutable_cf_options_.target_file_size_base = 10000000;
  mutable_cf_options_.target_file_size_multiplier = 10;
  mutable_cf_options_.max_bytes_for_level_base = 10 * 1024 * 1024;
-  mutable_cf_options_.RefreshDerivedOptions(ioptions_);

  Add(2, 6U, "150", "179", 50000000U);
  Add(2, 7U, "180", "220", 50000000U);
@@ -552,8 +543,6 @@ TEST_F(CompactionPickerTest, CompactionPriMinOverlapping1) {
  ASSERT_EQ(1U, compaction->num_input_files(0));
  // Pick file 8 because it overlaps with 0 files on level 3.
  ASSERT_EQ(8U, compaction->input(0, 0)->fd.GetNumber());
-  // Compaction input size * 1.1
-  ASSERT_GE(uint64_t{55000000}, compaction->OutputFilePreallocationSize());
 }

 TEST_F(CompactionPickerTest, CompactionPriMinOverlapping2) {
@@ -863,80 +852,6 @@ TEST_F(CompactionPickerTest, OverlappingUserKeys9) {
  ASSERT_EQ(8U, compaction->input(1, 1)->fd.GetNumber());
 }

-TEST_F(CompactionPickerTest, OverlappingUserKeys10) {
-  // Locked file encountered when pulling in extra input-level files with same
-  // user keys. Verify we pick the next-best file from the same input level.
-  NewVersionStorage(6, kCompactionStyleLevel);
-  mutable_cf_options_.max_compaction_bytes = 100000000000u;
-
-  // file_number 2U is largest and thus first choice. But it overlaps with
-  // file_number 1U which is being compacted. So instead we pick the next-
-  // biggest file, 3U, which is eligible for compaction.
-  Add(1 /* level */, 1U /* file_number */, "100" /* smallest */,
-      "150" /* largest */, 1U /* file_size */);
-  file_map_[1U].first->being_compacted = true;
-  Add(1 /* level */, 2U /* file_number */, "150" /* smallest */,
-      "200" /* largest */, 1000000000U /* file_size */, 0 /* smallest_seq */,
-      0 /* largest_seq */);
-  Add(1 /* level */, 3U /* file_number */, "201" /* smallest */,
-      "250" /* largest */, 900000000U /* file_size */);
-  Add(2 /* level */, 4U /* file_number */, "100" /* smallest */,
-      "150" /* largest */, 1U /* file_size */);
-  Add(2 /* level */, 5U /* file_number */, "151" /* smallest */,
-      "200" /* largest */, 1U /* file_size */);
-  Add(2 /* level */, 6U /* file_number */, "201" /* smallest */,
-      "250" /* largest */, 1U /* file_size */);
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_levels());
-  ASSERT_EQ(1U, compaction->num_input_files(0));
-  ASSERT_EQ(1U, compaction->num_input_files(1));
-  ASSERT_EQ(3U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(6U, compaction->input(1, 0)->fd.GetNumber());
-}
-
-TEST_F(CompactionPickerTest, OverlappingUserKeys11) {
-  // Locked file encountered when pulling in extra output-level files with same
-  // user keys. Expected to skip that compaction and pick the next-best choice.
-  NewVersionStorage(6, kCompactionStyleLevel);
-  mutable_cf_options_.max_compaction_bytes = 100000000000u;
-
-  // score(L1) = 3.7
-  // score(L2) = 1.85
-  // There is no eligible file in L1 to compact since both candidates pull in
-  // file_number 5U, which overlaps with a file pending compaction (6U). The
-  // first eligible compaction is from L2->L3.
-  Add(1 /* level */, 2U /* file_number */, "151" /* smallest */,
-      "200" /* largest */, 1000000000U /* file_size */);
-  Add(1 /* level */, 3U /* file_number */, "201" /* smallest */,
-      "250" /* largest */, 1U /* file_size */);
-  Add(2 /* level */, 4U /* file_number */, "100" /* smallest */,
-      "149" /* largest */, 5000000000U /* file_size */);
-  Add(2 /* level */, 5U /* file_number */, "150" /* smallest */,
-      "201" /* largest */, 1U /* file_size */);
-  Add(2 /* level */, 6U /* file_number */, "201" /* smallest */,
-      "249" /* largest */, 1U /* file_size */, 0 /* smallest_seq */,
-      0 /* largest_seq */);
-  file_map_[6U].first->being_compacted = true;
-  Add(3 /* level */, 7U /* file_number */, "100" /* smallest */,
-      "149" /* largest */, 1U /* file_size */);
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2U, compaction->num_input_levels());
-  ASSERT_EQ(1U, compaction->num_input_files(0));
-  ASSERT_EQ(1U, compaction->num_input_files(1));
-  ASSERT_EQ(4U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(7U, compaction->input(1, 0)->fd.GetNumber());
-}
-
 TEST_F(CompactionPickerTest, NotScheduleL1IfL0WithHigherPri1) {
  NewVersionStorage(6, kCompactionStyleLevel);
  mutable_cf_options_.level0_file_num_compaction_trigger = 2;
@@ -1401,49 +1316,6 @@ TEST_F(CompactionPickerTest, IsTrivialMoveOff) {
  ASSERT_FALSE(compaction->IsTrivialMove());
 }

-TEST_F(CompactionPickerTest, CacheNextCompactionIndex) {
-  NewVersionStorage(6, kCompactionStyleLevel);
-  mutable_cf_options_.max_compaction_bytes = 100000000000u;
-
-  Add(1 /* level */, 1U /* file_number */, "100" /* smallest */,
-      "149" /* largest */, 1000000000U /* file_size */);
-  file_map_[1U].first->being_compacted = true;
-  Add(1 /* level */, 2U /* file_number */, "150" /* smallest */,
-      "199" /* largest */, 900000000U /* file_size */);
-  Add(1 /* level */, 3U /* file_number */, "200" /* smallest */,
-      "249" /* largest */, 800000000U /* file_size */);
-  Add(1 /* level */, 4U /* file_number */, "250" /* smallest */,
-      "299" /* largest */, 700000000U /* file_size */);
-  Add(2 /* level */, 5U /* file_number */, "150" /* smallest */,
-      "199" /* largest */, 1U /* file_size */);
-  file_map_[5U].first->being_compacted = true;
-
-  UpdateVersionStorageInfo();
-
-  std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1U, compaction->num_input_levels());
-  ASSERT_EQ(1U, compaction->num_input_files(0));
-  ASSERT_EQ(0U, compaction->num_input_files(1));
-  ASSERT_EQ(3U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(2, vstorage_->NextCompactionIndex(1 /* level */));
-
-  compaction.reset(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1U, compaction->num_input_levels());
-  ASSERT_EQ(1U, compaction->num_input_files(0));
-  ASSERT_EQ(0U, compaction->num_input_files(1));
-  ASSERT_EQ(4U, compaction->input(0, 0)->fd.GetNumber());
-  ASSERT_EQ(3, vstorage_->NextCompactionIndex(1 /* level */));
-
-  compaction.reset(level_compaction_picker.PickCompaction(
-      cf_name_, mutable_cf_options_, vstorage_.get(), &log_buffer_));
-  ASSERT_TRUE(compaction.get() == nullptr);
-  ASSERT_EQ(4, vstorage_->NextCompactionIndex(1 /* level */));
-}
-
 }  // namespace rocksdb

 int main(int argc, char** argv) {
@@ -35,7 +35,7 @@ namespace {
 // and the index of the file in that level

 struct InputFileInfo {
-  InputFileInfo() : f(nullptr), level(0), index(0) {}
+  InputFileInfo() : f(nullptr) {}

  FileMetaData* f;
  size_t level;
@@ -204,8 +204,7 @@ void UniversalCompactionPicker::SortedRun::DumpSizeInfo(

 std::vector<UniversalCompactionPicker::SortedRun>
 UniversalCompactionPicker::CalculateSortedRuns(
-    const VersionStorageInfo& vstorage, const ImmutableCFOptions& /*ioptions*/,
-    const MutableCFOptions& mutable_cf_options) {
+    const VersionStorageInfo& vstorage, const ImmutableCFOptions& ioptions) {
  std::vector<UniversalCompactionPicker::SortedRun> ret;
  for (FileMetaData* f : vstorage.LevelFiles(0)) {
    ret.emplace_back(0, f, f->fd.GetFileSize(), f->compensated_file_size,
@@ -219,8 +218,7 @@ UniversalCompactionPicker::CalculateSortedRuns(
    for (FileMetaData* f : vstorage.LevelFiles(level)) {
      total_compensated_size += f->compensated_file_size;
      total_size += f->fd.GetFileSize();
-      if (mutable_cf_options.compaction_options_universal.allow_trivial_move ==
-          true) {
+      if (ioptions.compaction_options_universal.allow_trivial_move == true) {
        if (f->being_compacted) {
          being_compacted = f->being_compacted;
        }
@@ -229,8 +227,7 @@ UniversalCompactionPicker::CalculateSortedRuns(
        // non-zero level, all the files should share the same being_compacted
        // value.
        // This assumption is only valid when
-        // mutable_cf_options.compaction_options_universal.allow_trivial_move is
-        // false
+        // ioptions.compaction_options_universal.allow_trivial_move is false
        assert(is_first || f->being_compacted == being_compacted);
      }
      if (is_first) {
@@ -248,13 +245,14 @@ UniversalCompactionPicker::CalculateSortedRuns(

 // Universal style of compaction. Pick files that are contiguous in
 // time-range to compact.
+//
 Compaction* UniversalCompactionPicker::PickCompaction(
    const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
    VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
  const int kLevel0 = 0;
  double score = vstorage->CompactionScore(kLevel0);
  std::vector<SortedRun> sorted_runs =
-      CalculateSortedRuns(*vstorage, ioptions_, mutable_cf_options);
+      CalculateSortedRuns(*vstorage, ioptions_);

  if (sorted_runs.size() == 0 ||
      sorted_runs.size() <
@@ -281,8 +279,7 @@ Compaction* UniversalCompactionPicker::PickCompaction(
  } else {
    // Size amplification is within limits. Try reducing read
    // amplification while maintaining file size ratios.
-    unsigned int ratio =
-        mutable_cf_options.compaction_options_universal.size_ratio;
+    unsigned int ratio = ioptions_.compaction_options_universal.size_ratio;

    if ((c = PickCompactionToReduceSortedRuns(
             cf_name, mutable_cf_options, vstorage, score, ratio, UINT_MAX,
@@ -330,8 +327,7 @@ Compaction* UniversalCompactionPicker::PickCompaction(
    return nullptr;
  }

-  if (mutable_cf_options.compaction_options_universal.allow_trivial_move ==
-      true) {
+  if (ioptions_.compaction_options_universal.allow_trivial_move == true) {
    c->set_is_trivial_move(IsInputFilesNonOverlapping(c));
  }

@@ -377,7 +373,6 @@ Compaction* UniversalCompactionPicker::PickCompaction(
              c->inputs(0)->size());

  RegisterCompaction(c);
-  vstorage->ComputeCompactionScore(ioptions_, mutable_cf_options);

  TEST_SYNC_POINT_CALLBACK("UniversalCompactionPicker::PickCompaction:Return",
                           c);
@@ -385,8 +380,7 @@ Compaction* UniversalCompactionPicker::PickCompaction(
 }

 uint32_t UniversalCompactionPicker::GetPathId(
-    const ImmutableCFOptions& ioptions,
-    const MutableCFOptions& mutable_cf_options, uint64_t file_size) {
+    const ImmutableCFOptions& ioptions, uint64_t file_size) {
  // Two conditions need to be satisfied:
  // (1) the target path needs to be able to hold the file's size
  // (2) Total size left in this and previous paths need to be not
@@ -403,8 +397,8 @@ uint32_t UniversalCompactionPicker::GetPathId(
  // that case. We need to improve it.
  uint64_t accumulated_size = 0;
  uint64_t future_size =
-      file_size *
-      (100 - mutable_cf_options.compaction_options_universal.size_ratio) / 100;
+      file_size * (100 - ioptions.compaction_options_universal.size_ratio) /
+      100;
  uint32_t p = 0;
  assert(!ioptions.db_paths.empty());
  for (; p < ioptions.db_paths.size() - 1; p++) {
@@ -428,9 +422,9 @@ Compaction* UniversalCompactionPicker::PickCompactionToReduceSortedRuns(
    unsigned int max_number_of_files_to_compact,
    const std::vector<SortedRun>& sorted_runs, LogBuffer* log_buffer) {
  unsigned int min_merge_width =
-      mutable_cf_options.compaction_options_universal.min_merge_width;
+      ioptions_.compaction_options_universal.min_merge_width;
  unsigned int max_merge_width =
-      mutable_cf_options.compaction_options_universal.max_merge_width;
+      ioptions_.compaction_options_universal.max_merge_width;

  const SortedRun* sr = nullptr;
  bool done = false;
@@ -497,7 +491,7 @@ Compaction* UniversalCompactionPicker::PickCompactionToReduceSortedRuns(
      if (sz < static_cast<double>(succeeding_sr->size)) {
        break;
      }
-      if (mutable_cf_options.compaction_options_universal.stop_style ==
+      if (ioptions_.compaction_options_universal.stop_style ==
          kCompactionStopStyleSimilarSize) {
        // Similar-size stopping rule: also check the last picked file isn't
        // far larger than the next candidate file.
@@ -540,7 +534,7 @@ Compaction* UniversalCompactionPicker::PickCompactionToReduceSortedRuns(
  // size ratio of compression.
  bool enable_compression = true;
  int ratio_to_compress =
-      mutable_cf_options.compaction_options_universal.compression_size_percent;
+      ioptions_.compaction_options_universal.compression_size_percent;
  if (ratio_to_compress >= 0) {
    uint64_t total_size = 0;
    for (auto& sorted_run : sorted_runs) {
@@ -561,8 +555,7 @@ Compaction* UniversalCompactionPicker::PickCompactionToReduceSortedRuns(
  for (unsigned int i = 0; i < first_index_after; i++) {
    estimated_total_size += sorted_runs[i].size;
  }
-  uint32_t path_id =
-      GetPathId(ioptions_, mutable_cf_options, estimated_total_size);
+  uint32_t path_id = GetPathId(ioptions_, estimated_total_size);
  int start_level = sorted_runs[start_index].level;
  int output_level;
  if (first_index_after == sorted_runs.size()) {
@@ -603,9 +596,9 @@ Compaction* UniversalCompactionPicker::PickCompactionToReduceSortedRuns(

  CompactionReason compaction_reason;
  if (max_number_of_files_to_compact == UINT_MAX) {
-    compaction_reason = CompactionReason::kUniversalSizeRatio;
-  } else {
    compaction_reason = CompactionReason::kUniversalSortedRunNum;
+  } else {
+    compaction_reason = CompactionReason::kUniversalSizeRatio;
  }
  return new Compaction(
      vstorage, ioptions_, mutable_cf_options, std::move(inputs), output_level,
@@ -627,8 +620,8 @@ Compaction* UniversalCompactionPicker::PickCompactionToReduceSizeAmp(
    VersionStorageInfo* vstorage, double score,
    const std::vector<SortedRun>& sorted_runs, LogBuffer* log_buffer) {
  // percentage flexibility while reducing size amplification
-  uint64_t ratio = mutable_cf_options.compaction_options_universal
-                       .max_size_amplification_percent;
+  uint64_t ratio =
+      ioptions_.compaction_options_universal.max_size_amplification_percent;

  unsigned int candidate_count = 0;
  uint64_t candidate_size = 0;
@@ -706,8 +699,7 @@ Compaction* UniversalCompactionPicker::PickCompactionToReduceSizeAmp(
  for (size_t loop = start_index; loop < sorted_runs.size(); loop++) {
    estimated_total_size += sorted_runs[loop].size;
  }
-  uint32_t path_id =
-      GetPathId(ioptions_, mutable_cf_options, estimated_total_size);
+  uint32_t path_id = GetPathId(ioptions_, estimated_total_size);
  int start_level = sorted_runs[start_index].level;

  std::vector<CompactionInputFiles> inputs(vstorage->num_levels());
@@ -80,13 +80,11 @@ class UniversalCompactionPicker : public CompactionPicker {
  bool IsInputFilesNonOverlapping(Compaction* c);

  static std::vector<SortedRun> CalculateSortedRuns(
-      const VersionStorageInfo& vstorage, const ImmutableCFOptions& ioptions,
-      const MutableCFOptions& mutable_cf_options);
+      const VersionStorageInfo& vstorage, const ImmutableCFOptions& ioptions);

  // Pick a path ID to place a newly generated file, with its estimated file
  // size.
  static uint32_t GetPathId(const ImmutableCFOptions& ioptions,
-                            const MutableCFOptions& mutable_cf_options,
                            uint64_t file_size);
 };
 }  // namespace rocksdb
@@ -188,10 +188,10 @@ class DoubleComparator : public Comparator {
      return -1;
    }
  }
-  virtual void FindShortestSeparator(std::string* /*start*/,
-                                     const Slice& /*limit*/) const override {}
+  virtual void FindShortestSeparator(std::string* start,
+                                     const Slice& limit) const override {}

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

 class HashComparator : public Comparator {
@@ -211,10 +211,10 @@ class HashComparator : public Comparator {
      return -1;
    }
  }
-  virtual void FindShortestSeparator(std::string* /*start*/,
-                                     const Slice& /*limit*/) const override {}
+  virtual void FindShortestSeparator(std::string* start,
+                                     const Slice& limit) const override {}

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

 class TwoStrComparator : public Comparator {
@@ -243,10 +243,10 @@ class TwoStrComparator : public Comparator {
    }
    return a2.compare(b2);
  }
-  virtual void FindShortestSeparator(std::string* /*start*/,
-                                     const Slice& /*limit*/) const override {}
+  virtual void FindShortestSeparator(std::string* start,
+                                     const Slice& limit) const override {}

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

@@ -9,56 +9,17 @@
 #include "rocksdb/convenience.h"

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

 namespace rocksdb {

 void CancelAllBackgroundWork(DB* db, bool wait) {
-  (static_cast_with_check<DBImpl, DB>(db->GetRootDB()))
-      ->CancelAllBackgroundWork(wait);
+  (dynamic_cast<DBImpl*>(db->GetRootDB()))->CancelAllBackgroundWork(wait);
 }

 Status DeleteFilesInRange(DB* db, ColumnFamilyHandle* column_family,
-                          const Slice* begin, const Slice* end,
-                          bool include_end) {
-  RangePtr range(begin, end);
-  return DeleteFilesInRanges(db, column_family, &range, 1, include_end);
-}
-
-Status DeleteFilesInRanges(DB* db, ColumnFamilyHandle* column_family,
-                           const RangePtr* ranges, size_t n,
-                           bool include_end) {
-  return (static_cast_with_check<DBImpl, DB>(db->GetRootDB()))
-      ->DeleteFilesInRanges(column_family, ranges, n, include_end);
-}
-
-Status VerifySstFileChecksum(const Options& options,
-                             const EnvOptions& env_options,
-                             const std::string& file_path) {
-  unique_ptr<RandomAccessFile> file;
-  uint64_t file_size;
-  InternalKeyComparator internal_comparator(options.comparator);
-  ImmutableCFOptions ioptions(options);
-
-  Status s = ioptions.env->NewRandomAccessFile(file_path, &file, env_options);
-  if (s.ok()) {
-    s = ioptions.env->GetFileSize(file_path, &file_size);
-  } else {
-    return s;
-  }
-  unique_ptr<TableReader> table_reader;
-  std::unique_ptr<RandomAccessFileReader> file_reader(
-      new RandomAccessFileReader(std::move(file), file_path));
-  s = ioptions.table_factory->NewTableReader(
-      TableReaderOptions(ioptions, env_options, internal_comparator,
-                         false /* skip_filters */, -1 /* level */),
-      std::move(file_reader), file_size, &table_reader,
-      false /* prefetch_index_and_filter_in_cache */);
-  if (!s.ok()) {
-    return s;
-  }
-  s = table_reader->VerifyChecksum();
-  return s;
+                          const Slice* begin, const Slice* end) {
+  return (dynamic_cast<DBImpl*>(db->GetRootDB()))
+      ->DeleteFilesInRange(column_family, begin, end);
 }

 }  // namespace rocksdb
@@ -20,7 +20,6 @@
 #include "db/log_format.h"
 #include "db/version_set.h"
 #include "rocksdb/cache.h"
-#include "rocksdb/convenience.h"
 #include "rocksdb/env.h"
 #include "rocksdb/table.h"
 #include "rocksdb/write_batch.h"
@@ -153,7 +152,7 @@ class CorruptionTest : public testing::Test {
    struct stat sbuf;
    if (stat(fname.c_str(), &sbuf) != 0) {
      const char* msg = strerror(errno);
-      FAIL() << fname << ": " << msg;
+      ASSERT_TRUE(false) << fname << ": " << msg;
    }

    if (offset < 0) {
@@ -180,9 +179,6 @@ class CorruptionTest : public testing::Test {
    }
    s = WriteStringToFile(Env::Default(), contents, fname);
    ASSERT_TRUE(s.ok()) << s.ToString();
-    Options options;
-    EnvOptions env_options;
-    ASSERT_NOK(VerifySstFileChecksum(options, env_options, fname));
  }

  void Corrupt(FileType filetype, int offset, int bytes_to_corrupt) {
@@ -217,7 +213,7 @@ class CorruptionTest : public testing::Test {
        return;
      }
    }
-    FAIL() << "no file found at level";
+    ASSERT_TRUE(false) << "no file found at level";
  }


@@ -316,7 +312,6 @@ TEST_F(CorruptionTest, TableFile) {

  Corrupt(kTableFile, 100, 1);
  Check(99, 99);
-  ASSERT_NOK(dbi->VerifyChecksum());
 }

 TEST_F(CorruptionTest, TableFileIndexData) {
@@ -332,11 +327,9 @@ TEST_F(CorruptionTest, TableFileIndexData) {
  // corrupt an index block of an entire file
  Corrupt(kTableFile, -2000, 500);
  Reopen();
-  dbi = reinterpret_cast<DBImpl*>(db_);
  // one full file should be readable, since only one was corrupted
  // the other file should be fully non-readable, since index was corrupted
  Check(5000, 5000);
-  ASSERT_NOK(dbi->VerifyChecksum());
 }

 TEST_F(CorruptionTest, MissingDescriptor) {
@@ -396,12 +389,10 @@ TEST_F(CorruptionTest, CompactionInputError) {

  Corrupt(kTableFile, 100, 1);
  Check(9, 9);
-  ASSERT_NOK(dbi->VerifyChecksum());

  // Force compactions by writing lots of values
  Build(10000);
  Check(10000, 10000);
-  ASSERT_NOK(dbi->VerifyChecksum());
 }

 TEST_F(CorruptionTest, CompactionInputErrorParanoid) {
@@ -433,7 +424,6 @@ TEST_F(CorruptionTest, CompactionInputErrorParanoid) {

  CorruptTableFileAtLevel(0, 100, 1);
  Check(9, 9);
-  ASSERT_NOK(dbi->VerifyChecksum());

  // Write must eventually fail because of corrupted table
  Status s;
@@ -455,7 +445,6 @@ TEST_F(CorruptionTest, UnrelatedKeys) {
  DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
  dbi->TEST_FlushMemTable();
  Corrupt(kTableFile, 100, 1);
-  ASSERT_NOK(dbi->VerifyChecksum());

  std::string tmp1, tmp2;
  ASSERT_OK(db_->Put(WriteOptions(), Key(1000, &tmp1), Value(1000, &tmp2)));
@@ -241,7 +241,7 @@ TEST_F(CuckooTableDBTest, CompactionIntoMultipleFiles) {

  // Write 28 values, each 10016 B ~ 10KB
  for (int idx = 0; idx < 28; ++idx) {
-    ASSERT_OK(Put(Key(idx), std::string(10000, 'a' + char(idx))));
+    ASSERT_OK(Put(Key(idx), std::string(10000, 'a' + idx)));
  }
  dbfull()->TEST_WaitForFlushMemTable();
  ASSERT_EQ("1", FilesPerLevel());
@@ -250,7 +250,7 @@ TEST_F(CuckooTableDBTest, CompactionIntoMultipleFiles) {
                              true /* disallow trivial move */);
  ASSERT_EQ("0,2", FilesPerLevel());
  for (int idx = 0; idx < 28; ++idx) {
-    ASSERT_EQ(std::string(10000, 'a' + char(idx)), Get(Key(idx)));
+    ASSERT_EQ(std::string(10000, 'a' + idx), Get(Key(idx)));
  }
 }

@@ -271,14 +271,14 @@ TEST_F(CuckooTableDBTest, SameKeyInsertedInTwoDifferentFilesAndCompacted) {

  // Generate one more file in level-0, and should trigger level-0 compaction
  for (int idx = 0; idx < 11; ++idx) {
-    ASSERT_OK(Put(Key(idx), std::string(10000, 'a' + char(idx))));
+    ASSERT_OK(Put(Key(idx), std::string(10000, 'a' + idx)));
  }
  dbfull()->TEST_WaitForFlushMemTable();
  dbfull()->TEST_CompactRange(0, nullptr, nullptr);

  ASSERT_EQ("0,1", FilesPerLevel());
  for (int idx = 0; idx < 11; ++idx) {
-    ASSERT_EQ(std::string(10000, 'a' + char(idx)), Get(Key(idx)));
+    ASSERT_EQ(std::string(10000, 'a' + idx), Get(Key(idx)));
  }
 }

@@ -9,7 +9,6 @@
 #include "db/db_test_util.h"
 #include "port/stack_trace.h"
 #include "rocksdb/perf_context.h"
-#include "util/fault_injection_test_env.h"
 #if !defined(ROCKSDB_LITE)
 #include "util/sync_point.h"
 #endif
@@ -42,7 +41,7 @@ TEST_F(DBBasicTest, ReadOnlyDB) {
  Close();

  auto options = CurrentOptions();
-  assert(options.env == env_);
+  assert(options.env = env_);
  ASSERT_OK(ReadOnlyReopen(options));
  ASSERT_EQ("v3", Get("foo"));
  ASSERT_EQ("v2", Get("bar"));
@@ -176,8 +175,6 @@ TEST_F(DBBasicTest, LevelLimitReopen) {
  int i = 0;
  while (NumTableFilesAtLevel(2, 1) == 0) {
    ASSERT_OK(Put(1, Key(i++), value));
-    dbfull()->TEST_WaitForFlushMemTable();
-    dbfull()->TEST_WaitForCompact();
  }

  options.num_levels = 1;
@@ -361,6 +358,7 @@ TEST_F(DBBasicTest, FLUSH) {
    WriteOptions writeOpt = WriteOptions();
    writeOpt.disableWAL = true;
    SetPerfLevel(kEnableTime);
+    ;
    ASSERT_OK(dbfull()->Put(writeOpt, handles_[1], "foo", "v1"));
    // this will now also flush the last 2 writes
    ASSERT_OK(Flush(1));
@@ -369,7 +367,6 @@ TEST_F(DBBasicTest, FLUSH) {
    get_perf_context()->Reset();
    Get(1, "foo");
    ASSERT_TRUE((int)get_perf_context()->get_from_output_files_time > 0);
-    ASSERT_EQ(2, (int)get_perf_context()->get_read_bytes);

    ReopenWithColumnFamilies({"default", "pikachu"}, CurrentOptions());
    ASSERT_EQ("v1", Get(1, "foo"));
@@ -571,19 +568,19 @@ TEST_F(DBBasicTest, CompactBetweenSnapshots) {

 TEST_F(DBBasicTest, DBOpen_Options) {
  Options options = CurrentOptions();
-  Close();
-  Destroy(options);
+  std::string dbname = test::TmpDir(env_) + "/db_options_test";
+  ASSERT_OK(DestroyDB(dbname, options));

  // Does not exist, and create_if_missing == false: error
  DB* db = nullptr;
  options.create_if_missing = false;
-  Status s = DB::Open(options, dbname_, &db);
+  Status s = DB::Open(options, dbname, &db);
  ASSERT_TRUE(strstr(s.ToString().c_str(), "does not exist") != nullptr);
  ASSERT_TRUE(db == nullptr);

  // Does not exist, and create_if_missing == true: OK
  options.create_if_missing = true;
-  s = DB::Open(options, dbname_, &db);
+  s = DB::Open(options, dbname, &db);
  ASSERT_OK(s);
  ASSERT_TRUE(db != nullptr);

@@ -593,14 +590,14 @@ TEST_F(DBBasicTest, DBOpen_Options) {
  // Does exist, and error_if_exists == true: error
  options.create_if_missing = false;
  options.error_if_exists = true;
-  s = DB::Open(options, dbname_, &db);
+  s = DB::Open(options, dbname, &db);
  ASSERT_TRUE(strstr(s.ToString().c_str(), "exists") != nullptr);
  ASSERT_TRUE(db == nullptr);

  // Does exist, and error_if_exists == false: OK
  options.create_if_missing = true;
  options.error_if_exists = false;
-  s = DB::Open(options, dbname_, &db);
+  s = DB::Open(options, dbname, &db);
  ASSERT_OK(s);
  ASSERT_TRUE(db != nullptr);

@@ -726,7 +723,6 @@ TEST_F(DBBasicTest, FlushOneColumnFamily) {
 TEST_F(DBBasicTest, MultiGetSimple) {
  do {
    CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
-    SetPerfLevel(kEnableCount);
    ASSERT_OK(Put(1, "k1", "v1"));
    ASSERT_OK(Put(1, "k2", "v2"));
    ASSERT_OK(Put(1, "k3", "v3"));
@@ -740,15 +736,12 @@ TEST_F(DBBasicTest, MultiGetSimple) {
    std::vector<std::string> values(20, "Temporary data to be overwritten");
    std::vector<ColumnFamilyHandle*> cfs(keys.size(), handles_[1]);

-    get_perf_context()->Reset();
    std::vector<Status> s = db_->MultiGet(ReadOptions(), cfs, keys, &values);
    ASSERT_EQ(values.size(), keys.size());
    ASSERT_EQ(values[0], "v1");
    ASSERT_EQ(values[1], "v2");
    ASSERT_EQ(values[2], "v3");
    ASSERT_EQ(values[4], "v5");
-    // four kv pairs * two bytes per value
-    ASSERT_EQ(8, (int)get_perf_context()->multiget_read_bytes);

    ASSERT_OK(s[0]);
    ASSERT_OK(s[1]);
@@ -756,7 +749,6 @@ TEST_F(DBBasicTest, MultiGetSimple) {
    ASSERT_TRUE(s[3].IsNotFound());
    ASSERT_OK(s[4]);
    ASSERT_TRUE(s[5].IsNotFound());
-    SetPerfLevel(kDisable);
  } while (ChangeCompactOptions());
 }

@@ -793,30 +785,36 @@ TEST_F(DBBasicTest, MultiGetEmpty) {
 TEST_F(DBBasicTest, ChecksumTest) {
  BlockBasedTableOptions table_options;
  Options options = CurrentOptions();
-  // change when new checksum type added
-  int max_checksum = static_cast<int>(kxxHash);
-  const int kNumPerFile = 2;

-  // generate one table with each type of checksum
-  for (int i = 0; i <= max_checksum; ++i) {
-    table_options.checksum = static_cast<ChecksumType>(i);
-    options.table_factory.reset(NewBlockBasedTableFactory(table_options));
-    Reopen(options);
-    for (int j = 0; j < kNumPerFile; ++j) {
-      ASSERT_OK(Put(Key(i * kNumPerFile + j), Key(i * kNumPerFile + j)));
-    }
-    ASSERT_OK(Flush());
-  }
+  table_options.checksum = kCRC32c;
+  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
+  Reopen(options);
+  ASSERT_OK(Put("a", "b"));
+  ASSERT_OK(Put("c", "d"));
+  ASSERT_OK(Flush());  // table with crc checksum

-  // verify data with each type of checksum
-  for (int i = 0; i <= kxxHash; ++i) {
-    table_options.checksum = static_cast<ChecksumType>(i);
-    options.table_factory.reset(NewBlockBasedTableFactory(table_options));
-    Reopen(options);
-    for (int j = 0; j < (max_checksum + 1) * kNumPerFile; ++j) {
-      ASSERT_EQ(Key(j), Get(Key(j)));
-    }
-  }
+  table_options.checksum = kxxHash;
+  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
+  Reopen(options);
+  ASSERT_OK(Put("e", "f"));
+  ASSERT_OK(Put("g", "h"));
+  ASSERT_OK(Flush());  // table with xxhash checksum
+
+  table_options.checksum = kCRC32c;
+  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
+  Reopen(options);
+  ASSERT_EQ("b", Get("a"));
+  ASSERT_EQ("d", Get("c"));
+  ASSERT_EQ("f", Get("e"));
+  ASSERT_EQ("h", Get("g"));
+
+  table_options.checksum = kCRC32c;
+  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
+  Reopen(options);
+  ASSERT_EQ("b", Get("a"));
+  ASSERT_EQ("d", Get("c"));
+  ASSERT_EQ("f", Get("e"));
+  ASSERT_EQ("h", Get("g"));
 }

 // On Windows you can have either memory mapped file or a file
@@ -824,9 +822,6 @@ TEST_F(DBBasicTest, ChecksumTest) {
 // sense to run
 #ifndef OS_WIN
 TEST_F(DBBasicTest, MmapAndBufferOptions) {
-  if (!IsMemoryMappedAccessSupported()) {
-    return;
-  }
  Options options = CurrentOptions();

  options.use_direct_reads = true;
@@ -848,114 +843,6 @@ TEST_F(DBBasicTest, MmapAndBufferOptions) {
 }
 #endif

-class TestEnv : public EnvWrapper {
-  public:
-    explicit TestEnv() : EnvWrapper(Env::Default()),
-                close_count(0) { }
-
-    class TestLogger : public Logger {
-      public:
-        using Logger::Logv;
-        TestLogger(TestEnv *env_ptr) : Logger() { env = env_ptr; }
-        ~TestLogger() {
-          if (!closed_) {
-            CloseHelper();
-          }
-        }
-        virtual void Logv(const char* /*format*/, va_list /*ap*/) override{};
-
-       protected:
-        virtual Status CloseImpl() override {
-          return CloseHelper();
-        }
-      private:
-        Status CloseHelper() {
-          env->CloseCountInc();;
-          return Status::IOError();
-        }
-        TestEnv *env;
-    };
-
-    void CloseCountInc() { close_count++; }
-
-    int GetCloseCount() { return close_count; }
-
-    virtual Status NewLogger(const std::string& /*fname*/,
-                             shared_ptr<Logger>* result) {
-      result->reset(new TestLogger(this));
-      return Status::OK();
-    }
-
-   private:
-    int close_count;
-};
-
-TEST_F(DBBasicTest, DBClose) {
-  Options options = GetDefaultOptions();
-  std::string dbname = test::TmpDir(env_) + "/db_close_test";
-  ASSERT_OK(DestroyDB(dbname, options));
-
-  DB* db = nullptr;
-  TestEnv* env = new TestEnv();
-  options.create_if_missing = true;
-  options.env = env;
-  Status s = DB::Open(options, dbname, &db);
-  ASSERT_OK(s);
-  ASSERT_TRUE(db != nullptr);
-
-  s = db->Close();
-  ASSERT_EQ(env->GetCloseCount(), 1);
-  ASSERT_EQ(s, Status::IOError());
-
-  delete db;
-  ASSERT_EQ(env->GetCloseCount(), 1);
-
-  // Do not call DB::Close() and ensure our logger Close() still gets called
-  s = DB::Open(options, dbname, &db);
-  ASSERT_OK(s);
-  ASSERT_TRUE(db != nullptr);
-  delete db;
-  ASSERT_EQ(env->GetCloseCount(), 2);
-
-  // Provide our own logger and ensure DB::Close() does not close it
-  options.info_log.reset(new TestEnv::TestLogger(env));
-  options.create_if_missing = false;
-  s = DB::Open(options, dbname, &db);
-  ASSERT_OK(s);
-  ASSERT_TRUE(db != nullptr);
-
-  s = db->Close();
-  ASSERT_EQ(s, Status::OK());
-  delete db;
-  ASSERT_EQ(env->GetCloseCount(), 2);
-  options.info_log.reset();
-  ASSERT_EQ(env->GetCloseCount(), 3);
-
-  delete options.env;
-}
-
-TEST_F(DBBasicTest, DBCloseFlushError) {
-  std::unique_ptr<FaultInjectionTestEnv> fault_injection_env(
-      new FaultInjectionTestEnv(Env::Default()));
-  Options options = GetDefaultOptions();
-  options.create_if_missing = true;
-  options.manual_wal_flush = true;
-  options.write_buffer_size=100;
-  options.env = fault_injection_env.get();
-
-  Reopen(options);
-  ASSERT_OK(Put("key1", "value1"));
-  ASSERT_OK(Put("key2", "value2"));
-  ASSERT_OK(dbfull()->TEST_SwitchMemtable());
-  ASSERT_OK(Put("key3", "value3"));
-  fault_injection_env->SetFilesystemActive(false);
-  Status s = dbfull()->Close();
-  fault_injection_env->SetFilesystemActive(true);
-  ASSERT_NE(s, Status::OK());
-
-  Destroy(options);
-}
-
 }  // namespace rocksdb

 int main(int argc, char** argv) {
@@ -1,410 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#include <functional>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "db/column_family.h"
-#include "db/db_iter.h"
-#include "db/db_test_util.h"
-#include "db/dbformat.h"
-#include "db/write_batch_internal.h"
-#include "port/port.h"
-#include "port/stack_trace.h"
-#include "util/string_util.h"
-#include "utilities/merge_operators.h"
-
-namespace rocksdb {
-
-// kTypeBlobIndex is a value type used by BlobDB only. The base rocksdb
-// should accept the value type on write, and report not supported value
-// for reads, unless caller request for it explicitly. The base rocksdb
-// doesn't understand format of actual blob index (the value).
-class DBBlobIndexTest : public DBTestBase {
- public:
-  enum Tier {
-    kMemtable = 0,
-    kImmutableMemtables = 1,
-    kL0SstFile = 2,
-    kLnSstFile = 3,
-  };
-  const std::vector<Tier> kAllTiers = {Tier::kMemtable,
-                                       Tier::kImmutableMemtables,
-                                       Tier::kL0SstFile, Tier::kLnSstFile};
-
-  DBBlobIndexTest() : DBTestBase("/db_blob_index_test") {}
-
-  ColumnFamilyHandle* cfh() { return dbfull()->DefaultColumnFamily(); }
-
-  ColumnFamilyData* cfd() {
-    return reinterpret_cast<ColumnFamilyHandleImpl*>(cfh())->cfd();
-  }
-
-  Status PutBlobIndex(WriteBatch* batch, const Slice& key,
-                      const Slice& blob_index) {
-    return WriteBatchInternal::PutBlobIndex(batch, cfd()->GetID(), key,
-                                            blob_index);
-  }
-
-  Status Write(WriteBatch* batch) {
-    return dbfull()->Write(WriteOptions(), batch);
-  }
-
-  std::string GetImpl(const Slice& key, bool* is_blob_index = nullptr,
-                      const Snapshot* snapshot = nullptr) {
-    ReadOptions read_options;
-    read_options.snapshot = snapshot;
-    PinnableSlice value;
-    auto s = dbfull()->GetImpl(read_options, cfh(), key, &value,
-                               nullptr /*value_found*/, nullptr /*callback*/,
-                               is_blob_index);
-    if (s.IsNotFound()) {
-      return "NOT_FOUND";
-    }
-    if (s.IsNotSupported()) {
-      return "NOT_SUPPORTED";
-    }
-    if (!s.ok()) {
-      return s.ToString();
-    }
-    return value.ToString();
-  }
-
-  std::string GetBlobIndex(const Slice& key,
-                           const Snapshot* snapshot = nullptr) {
-    bool is_blob_index = false;
-    std::string value = GetImpl(key, &is_blob_index, snapshot);
-    if (!is_blob_index) {
-      return "NOT_BLOB";
-    }
-    return value;
-  }
-
-  ArenaWrappedDBIter* GetBlobIterator() {
-    return dbfull()->NewIteratorImpl(
-        ReadOptions(), cfd(), dbfull()->GetLatestSequenceNumber(),
-        nullptr /*read_callback*/, true /*allow_blob*/);
-  }
-
-  Options GetTestOptions() {
-    Options options;
-    options.create_if_missing = true;
-    options.num_levels = 2;
-    options.disable_auto_compactions = true;
-    // Disable auto flushes.
-    options.max_write_buffer_number = 10;
-    options.min_write_buffer_number_to_merge = 10;
-    options.merge_operator = MergeOperators::CreateStringAppendOperator();
-    return options;
-  }
-
-  void MoveDataTo(Tier tier) {
-    switch (tier) {
-      case Tier::kMemtable:
-        break;
-      case Tier::kImmutableMemtables:
-        ASSERT_OK(dbfull()->TEST_SwitchMemtable());
-        break;
-      case Tier::kL0SstFile:
-        ASSERT_OK(Flush());
-        break;
-      case Tier::kLnSstFile:
-        ASSERT_OK(Flush());
-        ASSERT_OK(Put("a", "dummy"));
-        ASSERT_OK(Put("z", "dummy"));
-        ASSERT_OK(Flush());
-        ASSERT_OK(
-            dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr));
-#ifndef ROCKSDB_LITE
-        ASSERT_EQ("0,1", FilesPerLevel());
-#endif  // !ROCKSDB_LITE
-        break;
-    }
-  }
-};
-
-// Should be able to write kTypeBlobIndex to memtables and SST files.
-TEST_F(DBBlobIndexTest, Write) {
-  for (auto tier : kAllTiers) {
-    DestroyAndReopen(GetTestOptions());
-    for (int i = 1; i <= 5; i++) {
-      std::string index = ToString(i);
-      WriteBatch batch;
-      ASSERT_OK(PutBlobIndex(&batch, "key" + index, "blob" + index));
-      ASSERT_OK(Write(&batch));
-    }
-    MoveDataTo(tier);
-    for (int i = 1; i <= 5; i++) {
-      std::string index = ToString(i);
-      ASSERT_EQ("blob" + index, GetBlobIndex("key" + index));
-    }
-  }
-}
-
-// Get should be able to return blob index if is_blob_index is provided,
-// otherwise return Status::NotSupported status.
-TEST_F(DBBlobIndexTest, Get) {
-  for (auto tier : kAllTiers) {
-    DestroyAndReopen(GetTestOptions());
-    WriteBatch batch;
-    ASSERT_OK(batch.Put("key", "value"));
-    ASSERT_OK(PutBlobIndex(&batch, "blob_key", "blob_index"));
-    ASSERT_OK(Write(&batch));
-    MoveDataTo(tier);
-    // Verify normal value
-    bool is_blob_index = false;
-    PinnableSlice value;
-    ASSERT_EQ("value", Get("key"));
-    ASSERT_EQ("value", GetImpl("key"));
-    ASSERT_EQ("value", GetImpl("key", &is_blob_index));
-    ASSERT_FALSE(is_blob_index);
-    // Verify blob index
-    ASSERT_TRUE(Get("blob_key", &value).IsNotSupported());
-    ASSERT_EQ("NOT_SUPPORTED", GetImpl("blob_key"));
-    ASSERT_EQ("blob_index", GetImpl("blob_key", &is_blob_index));
-    ASSERT_TRUE(is_blob_index);
-  }
-}
-
-// Get should NOT return Status::NotSupported if blob index is updated with
-// a normal value.
-TEST_F(DBBlobIndexTest, Updated) {
-  for (auto tier : kAllTiers) {
-    DestroyAndReopen(GetTestOptions());
-    WriteBatch batch;
-    for (int i = 0; i < 10; i++) {
-      ASSERT_OK(PutBlobIndex(&batch, "key" + ToString(i), "blob_index"));
-    }
-    ASSERT_OK(Write(&batch));
-    // Avoid blob values from being purged.
-    const Snapshot* snapshot = dbfull()->GetSnapshot();
-    ASSERT_OK(Put("key1", "new_value"));
-    ASSERT_OK(Merge("key2", "a"));
-    ASSERT_OK(Merge("key2", "b"));
-    ASSERT_OK(Merge("key2", "c"));
-    ASSERT_OK(Delete("key3"));
-    ASSERT_OK(SingleDelete("key4"));
-    ASSERT_OK(Delete("key5"));
-    ASSERT_OK(Merge("key5", "a"));
-    ASSERT_OK(Merge("key5", "b"));
-    ASSERT_OK(Merge("key5", "c"));
-    ASSERT_OK(dbfull()->DeleteRange(WriteOptions(), cfh(), "key6", "key9"));
-    MoveDataTo(tier);
-    for (int i = 0; i < 10; i++) {
-      ASSERT_EQ("blob_index", GetBlobIndex("key" + ToString(i), snapshot));
-    }
-    ASSERT_EQ("new_value", Get("key1"));
-    ASSERT_EQ("NOT_SUPPORTED", GetImpl("key2"));
-    ASSERT_EQ("NOT_FOUND", Get("key3"));
-    ASSERT_EQ("NOT_FOUND", Get("key4"));
-    ASSERT_EQ("a,b,c", GetImpl("key5"));
-    for (int i = 6; i < 9; i++) {
-      ASSERT_EQ("NOT_FOUND", Get("key" + ToString(i)));
-    }
-    ASSERT_EQ("blob_index", GetBlobIndex("key9"));
-    dbfull()->ReleaseSnapshot(snapshot);
-  }
-}
-
-// Iterator should get blob value if allow_blob flag is set,
-// otherwise return Status::NotSupported status.
-TEST_F(DBBlobIndexTest, Iterate) {
-  const std::vector<std::vector<ValueType>> data = {
-      /*00*/ {kTypeValue},
-      /*01*/ {kTypeBlobIndex},
-      /*02*/ {kTypeValue},
-      /*03*/ {kTypeBlobIndex, kTypeValue},
-      /*04*/ {kTypeValue},
-      /*05*/ {kTypeValue, kTypeBlobIndex},
-      /*06*/ {kTypeValue},
-      /*07*/ {kTypeDeletion, kTypeBlobIndex},
-      /*08*/ {kTypeValue},
-      /*09*/ {kTypeSingleDeletion, kTypeBlobIndex},
-      /*10*/ {kTypeValue},
-      /*11*/ {kTypeMerge, kTypeMerge, kTypeMerge, kTypeBlobIndex},
-      /*12*/ {kTypeValue},
-      /*13*/
-      {kTypeMerge, kTypeMerge, kTypeMerge, kTypeDeletion, kTypeBlobIndex},
-      /*14*/ {kTypeValue},
-      /*15*/ {kTypeBlobIndex},
-      /*16*/ {kTypeValue},
-  };
-
-  auto get_key = [](int index) {
-    char buf[20];
-    snprintf(buf, sizeof(buf), "%02d", index);
-    return "key" + std::string(buf);
-  };
-
-  auto get_value = [&](int index, int version) {
-    return get_key(index) + "_value" + ToString(version);
-  };
-
-  auto check_iterator = [&](Iterator* iterator, Status::Code expected_status,
-                            const Slice& expected_value) {
-    ASSERT_EQ(expected_status, iterator->status().code());
-    if (expected_status == Status::kOk) {
-      ASSERT_TRUE(iterator->Valid());
-      ASSERT_EQ(expected_value, iterator->value());
-    } else {
-      ASSERT_FALSE(iterator->Valid());
-    }
-  };
-
-  auto create_normal_iterator = [&]() -> Iterator* {
-    return dbfull()->NewIterator(ReadOptions());
-  };
-
-  auto create_blob_iterator = [&]() -> Iterator* { return GetBlobIterator(); };
-
-  auto check_is_blob = [&](bool is_blob) {
-    return [is_blob](Iterator* iterator) {
-      ASSERT_EQ(is_blob,
-                reinterpret_cast<ArenaWrappedDBIter*>(iterator)->IsBlob());
-    };
-  };
-
-  auto verify = [&](int index, Status::Code expected_status,
-                    const Slice& forward_value, const Slice& backward_value,
-                    std::function<Iterator*()> create_iterator,
-                    std::function<void(Iterator*)> extra_check = nullptr) {
-    // Seek
-    auto* iterator = create_iterator();
-    ASSERT_OK(iterator->Refresh());
-    iterator->Seek(get_key(index));
-    check_iterator(iterator, expected_status, forward_value);
-    if (extra_check) {
-      extra_check(iterator);
-    }
-    delete iterator;
-
-    // Next
-    iterator = create_iterator();
-    ASSERT_OK(iterator->Refresh());
-    iterator->Seek(get_key(index - 1));
-    ASSERT_TRUE(iterator->Valid());
-    iterator->Next();
-    check_iterator(iterator, expected_status, forward_value);
-    if (extra_check) {
-      extra_check(iterator);
-    }
-    delete iterator;
-
-    // SeekForPrev
-    iterator = create_iterator();
-    ASSERT_OK(iterator->Refresh());
-    iterator->SeekForPrev(get_key(index));
-    check_iterator(iterator, expected_status, backward_value);
-    if (extra_check) {
-      extra_check(iterator);
-    }
-    delete iterator;
-
-    // Prev
-    iterator = create_iterator();
-    iterator->Seek(get_key(index + 1));
-    ASSERT_TRUE(iterator->Valid());
-    iterator->Prev();
-    check_iterator(iterator, expected_status, backward_value);
-    if (extra_check) {
-      extra_check(iterator);
-    }
-    delete iterator;
-  };
-
-  for (auto tier : {Tier::kMemtable} /*kAllTiers*/) {
-    // Avoid values from being purged.
-    std::vector<const Snapshot*> snapshots;
-    DestroyAndReopen(GetTestOptions());
-
-    // fill data
-    for (int i = 0; i < static_cast<int>(data.size()); i++) {
-      for (int j = static_cast<int>(data[i].size()) - 1; j >= 0; j--) {
-        std::string key = get_key(i);
-        std::string value = get_value(i, j);
-        WriteBatch batch;
-        switch (data[i][j]) {
-          case kTypeValue:
-            ASSERT_OK(Put(key, value));
-            break;
-          case kTypeDeletion:
-            ASSERT_OK(Delete(key));
-            break;
-          case kTypeSingleDeletion:
-            ASSERT_OK(SingleDelete(key));
-            break;
-          case kTypeMerge:
-            ASSERT_OK(Merge(key, value));
-            break;
-          case kTypeBlobIndex:
-            ASSERT_OK(PutBlobIndex(&batch, key, value));
-            ASSERT_OK(Write(&batch));
-            break;
-          default:
-            assert(false);
-        };
-      }
-      snapshots.push_back(dbfull()->GetSnapshot());
-    }
-    ASSERT_OK(
-        dbfull()->DeleteRange(WriteOptions(), cfh(), get_key(15), get_key(16)));
-    snapshots.push_back(dbfull()->GetSnapshot());
-    MoveDataTo(tier);
-
-    // Normal iterator
-    verify(1, Status::kNotSupported, "", "", create_normal_iterator);
-    verify(3, Status::kNotSupported, "", "", create_normal_iterator);
-    verify(5, Status::kOk, get_value(5, 0), get_value(5, 0),
-           create_normal_iterator);
-    verify(7, Status::kOk, get_value(8, 0), get_value(6, 0),
-           create_normal_iterator);
-    verify(9, Status::kOk, get_value(10, 0), get_value(8, 0),
-           create_normal_iterator);
-    verify(11, Status::kNotSupported, "", "", create_normal_iterator);
-    verify(13, Status::kOk,
-           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
-           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
-           create_normal_iterator);
-    verify(15, Status::kOk, get_value(16, 0), get_value(14, 0),
-           create_normal_iterator);
-
-    // Iterator with blob support
-    verify(1, Status::kOk, get_value(1, 0), get_value(1, 0),
-           create_blob_iterator, check_is_blob(true));
-    verify(3, Status::kOk, get_value(3, 0), get_value(3, 0),
-           create_blob_iterator, check_is_blob(true));
-    verify(5, Status::kOk, get_value(5, 0), get_value(5, 0),
-           create_blob_iterator, check_is_blob(false));
-    verify(7, Status::kOk, get_value(8, 0), get_value(6, 0),
-           create_blob_iterator, check_is_blob(false));
-    verify(9, Status::kOk, get_value(10, 0), get_value(8, 0),
-           create_blob_iterator, check_is_blob(false));
-    verify(11, Status::kNotSupported, "", "", create_blob_iterator);
-    verify(13, Status::kOk,
-           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
-           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
-           create_blob_iterator, check_is_blob(false));
-    verify(15, Status::kOk, get_value(16, 0), get_value(14, 0),
-           create_blob_iterator, check_is_blob(false));
-
-    for (auto* snapshot : snapshots) {
-      dbfull()->ReleaseSnapshot(snapshot);
-    }
-  }
-}
-
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -47,7 +47,7 @@ class DBBlockCacheTest : public DBTestBase {
    return options;
  }

-  void InitTable(const Options& /*options*/) {
+  void InitTable(const Options& options) {
    std::string value(kValueSize, 'a');
    for (size_t i = 0; i < kNumBlocks; i++) {
      ASSERT_OK(Put(ToString(i), value.c_str()));
@@ -111,31 +111,6 @@ class DBBlockCacheTest : public DBTestBase {
  }
 };

-TEST_F(DBBlockCacheTest, IteratorBlockCacheUsage) {
-  ReadOptions read_options;
-  read_options.fill_cache = false;
-  auto table_options = GetTableOptions();
-  auto options = GetOptions(table_options);
-  InitTable(options);
-
-  std::shared_ptr<Cache> cache = NewLRUCache(0, 0, false);
-  table_options.block_cache = cache;
-  options.table_factory.reset(new BlockBasedTableFactory(table_options));
-  Reopen(options);
-  RecordCacheCounters(options);
-
-  std::vector<std::unique_ptr<Iterator>> iterators(kNumBlocks - 1);
-  Iterator* iter = nullptr;
-
-  ASSERT_EQ(0, cache->GetUsage());
-  iter = db_->NewIterator(read_options);
-  iter->Seek(ToString(0));
-  ASSERT_LT(0, cache->GetUsage());
-  delete iter;
-  iter = nullptr;
-  ASSERT_EQ(0, cache->GetUsage());
-}
-
 TEST_F(DBBlockCacheTest, TestWithoutCompressedBlockCache) {
  ReadOptions read_options;
  auto table_options = GetTableOptions();
@@ -522,7 +497,7 @@ TEST_F(DBBlockCacheTest, CompressedCache) {
        options.compression = kNoCompression;
        break;
      default:
-        FAIL();
+        ASSERT_TRUE(false);
    }
    CreateAndReopenWithCF({"pikachu"}, options);
    // default column family doesn't have block cache
@@ -585,7 +560,7 @@ TEST_F(DBBlockCacheTest, CompressedCache) {
        ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_HIT), 0);
        break;
      default:
-        FAIL();
+        ASSERT_TRUE(false);
    }

    options.create_if_missing = true;
@@ -24,41 +24,11 @@ class DBTestCompactionFilter : public DBTestBase {
  DBTestCompactionFilter() : DBTestBase("/db_compaction_filter_test") {}
 };

-// Param variant of DBTestBase::ChangeCompactOptions
-class DBTestCompactionFilterWithCompactParam
-    : public DBTestCompactionFilter,
-      public ::testing::WithParamInterface<DBTestBase::OptionConfig> {
- public:
-  DBTestCompactionFilterWithCompactParam() : DBTestCompactionFilter() {
-    option_config_ = GetParam();
-    Destroy(last_options_);
-    auto options = CurrentOptions();
-    if (option_config_ == kDefault || option_config_ == kUniversalCompaction ||
-        option_config_ == kUniversalCompactionMultiLevel) {
-      options.create_if_missing = true;
-    }
-    if (option_config_ == kLevelSubcompactions ||
-        option_config_ == kUniversalSubcompactions) {
-      assert(options.max_subcompactions > 1);
-    }
-    TryReopen(options);
-  }
-};
-
-INSTANTIATE_TEST_CASE_P(
-    DBTestCompactionFilterWithCompactOption,
-    DBTestCompactionFilterWithCompactParam,
-    ::testing::Values(DBTestBase::OptionConfig::kDefault,
-                      DBTestBase::OptionConfig::kUniversalCompaction,
-                      DBTestBase::OptionConfig::kUniversalCompactionMultiLevel,
-                      DBTestBase::OptionConfig::kLevelSubcompactions,
-                      DBTestBase::OptionConfig::kUniversalSubcompactions));
-
 class KeepFilter : public CompactionFilter {
 public:
-  virtual bool Filter(int /*level*/, const Slice& /*key*/,
-                      const Slice& /*value*/, std::string* /*new_value*/,
-                      bool* /*value_changed*/) const override {
+  virtual bool Filter(int level, const Slice& key, const Slice& value,
+                      std::string* new_value, bool* value_changed) const
+      override {
    cfilter_count++;
    return false;
  }
@@ -68,9 +38,9 @@ class KeepFilter : public CompactionFilter {

 class DeleteFilter : public CompactionFilter {
 public:
-  virtual bool Filter(int /*level*/, const Slice& /*key*/,
-                      const Slice& /*value*/, std::string* /*new_value*/,
-                      bool* /*value_changed*/) const override {
+  virtual bool Filter(int level, const Slice& key, const Slice& value,
+                      std::string* new_value, bool* value_changed) const
+      override {
    cfilter_count++;
    return true;
  }
@@ -80,9 +50,9 @@ class DeleteFilter : public CompactionFilter {

 class DeleteISFilter : public CompactionFilter {
 public:
-  virtual bool Filter(int /*level*/, const Slice& key, const Slice& /*value*/,
-                      std::string* /*new_value*/,
-                      bool* /*value_changed*/) const override {
+  virtual bool Filter(int level, const Slice& key, const Slice& value,
+                      std::string* new_value,
+                      bool* value_changed) const override {
    cfilter_count++;
    int i = std::stoi(key.ToString());
    if (i > 5 && i <= 105) {
@@ -100,16 +70,14 @@ class DeleteISFilter : public CompactionFilter {
 // zero-padded to length 10.
 class SkipEvenFilter : public CompactionFilter {
 public:
-  virtual Decision FilterV2(int /*level*/, const Slice& key,
-                            ValueType /*value_type*/,
-                            const Slice& /*existing_value*/,
-                            std::string* /*new_value*/,
+  virtual Decision FilterV2(int level, const Slice& key, ValueType value_type,
+                            const Slice& existing_value, std::string* new_value,
                            std::string* skip_until) const override {
    cfilter_count++;
    int i = std::stoi(key.ToString());
    if (i / 10 % 2 == 0) {
      char key_str[100];
-      snprintf(key_str, sizeof(key_str), "%010d", i / 10 * 10 + 10);
+      snprintf(key_str, sizeof(key), "%010d", i / 10 * 10 + 10);
      *skip_until = key_str;
      ++cfilter_skips;
      return Decision::kRemoveAndSkipUntil;
@@ -125,9 +93,9 @@ class SkipEvenFilter : public CompactionFilter {
 class DelayFilter : public CompactionFilter {
 public:
  explicit DelayFilter(DBTestBase* d) : db_test(d) {}
-  virtual bool Filter(int /*level*/, const Slice& /*key*/,
-                      const Slice& /*value*/, std::string* /*new_value*/,
-                      bool* /*value_changed*/) const override {
+  virtual bool Filter(int level, const Slice& key, const Slice& value,
+                      std::string* new_value,
+                      bool* value_changed) const override {
    db_test->env_->addon_time_.fetch_add(1000);
    return true;
  }
@@ -142,9 +110,9 @@ class ConditionalFilter : public CompactionFilter {
 public:
  explicit ConditionalFilter(const std::string* filtered_value)
      : filtered_value_(filtered_value) {}
-  virtual bool Filter(int /*level*/, const Slice& /*key*/, const Slice& value,
-                      std::string* /*new_value*/,
-                      bool* /*value_changed*/) const override {
+  virtual bool Filter(int level, const Slice& key, const Slice& value,
+                      std::string* new_value,
+                      bool* value_changed) const override {
    return value.ToString() == *filtered_value_;
  }

@@ -158,9 +126,9 @@ class ChangeFilter : public CompactionFilter {
 public:
  explicit ChangeFilter() {}

-  virtual bool Filter(int /*level*/, const Slice& /*key*/,
-                      const Slice& /*value*/, std::string* new_value,
-                      bool* value_changed) const override {
+  virtual bool Filter(int level, const Slice& key, const Slice& value,
+                      std::string* new_value, bool* value_changed) const
+      override {
    assert(new_value != nullptr);
    *new_value = NEW_VALUE;
    *value_changed = true;
@@ -249,7 +217,7 @@ class DelayFilterFactory : public CompactionFilterFactory {
 public:
  explicit DelayFilterFactory(DBTestBase* d) : db_test(d) {}
  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& /*context*/) override {
+      const CompactionFilter::Context& context) override {
    return std::unique_ptr<CompactionFilter>(new DelayFilter(db_test));
  }

@@ -265,7 +233,7 @@ class ConditionalFilterFactory : public CompactionFilterFactory {
      : filtered_value_(filtered_value.ToString()) {}

  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& /*context*/) override {
+      const CompactionFilter::Context& context) override {
    return std::unique_ptr<CompactionFilter>(
        new ConditionalFilter(&filtered_value_));
  }
@@ -283,7 +251,7 @@ class ChangeFilterFactory : public CompactionFilterFactory {
  explicit ChangeFilterFactory() {}

  virtual std::unique_ptr<CompactionFilter> CreateCompactionFilter(
-      const CompactionFilter::Context& /*context*/) override {
+      const CompactionFilter::Context& context) override {
    return std::unique_ptr<CompactionFilter>(new ChangeFilter());
  }

@@ -340,6 +308,7 @@ TEST_F(DBTestCompactionFilter, CompactionFilter) {
    ASSERT_OK(iter->status());
    while (iter->Valid()) {
      ParsedInternalKey ikey(Slice(), 0, kTypeValue);
+      ikey.sequence = -1;
      ASSERT_EQ(ParseInternalKey(iter->key(), &ikey), true);
      total++;
      if (ikey.sequence != 0) {
@@ -471,63 +440,65 @@ TEST_F(DBTestCompactionFilter, CompactionFilterDeletesAll) {
 }
 #endif  // ROCKSDB_LITE

-TEST_P(DBTestCompactionFilterWithCompactParam,
-       CompactionFilterWithValueChange) {
-  Options options = CurrentOptions();
-  options.num_levels = 3;
-  options.compaction_filter_factory = std::make_shared<ChangeFilterFactory>();
-  CreateAndReopenWithCF({"pikachu"}, options);
+TEST_F(DBTestCompactionFilter, CompactionFilterWithValueChange) {
+  do {
+    Options options = CurrentOptions();
+    options.num_levels = 3;
+    options.compaction_filter_factory =
+      std::make_shared<ChangeFilterFactory>();
+    CreateAndReopenWithCF({"pikachu"}, options);

-  // Write 100K+1 keys, these are written to a few files
-  // in L0. We do this so that the current snapshot points
-  // to the 100001 key.The compaction filter is  not invoked
-  // on keys that are visible via a snapshot because we
-  // anyways cannot delete it.
-  const std::string value(10, 'x');
-  for (int i = 0; i < 100001; i++) {
-    char key[100];
-    snprintf(key, sizeof(key), "B%010d", i);
-    Put(1, key, value);
-  }
+    // Write 100K+1 keys, these are written to a few files
+    // in L0. We do this so that the current snapshot points
+    // to the 100001 key.The compaction filter is  not invoked
+    // on keys that are visible via a snapshot because we
+    // anyways cannot delete it.
+    const std::string value(10, 'x');
+    for (int i = 0; i < 100001; i++) {
+      char key[100];
+      snprintf(key, sizeof(key), "B%010d", i);
+      Put(1, key, value);
+    }

-  // push all files to  lower levels
-  ASSERT_OK(Flush(1));
-  if (option_config_ != kUniversalCompactionMultiLevel &&
-      option_config_ != kUniversalSubcompactions) {
-    dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
-    dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
-  } else {
-    dbfull()->CompactRange(CompactRangeOptions(), handles_[1], nullptr,
-                           nullptr);
-  }
+    // push all files to  lower levels
+    ASSERT_OK(Flush(1));
+    if (option_config_ != kUniversalCompactionMultiLevel &&
+        option_config_ != kUniversalSubcompactions) {
+      dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
+      dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
+    } else {
+      dbfull()->CompactRange(CompactRangeOptions(), handles_[1], nullptr,
+                             nullptr);
+    }

-  // re-write all data again
-  for (int i = 0; i < 100001; i++) {
-    char key[100];
-    snprintf(key, sizeof(key), "B%010d", i);
-    Put(1, key, value);
-  }
+    // re-write all data again
+    for (int i = 0; i < 100001; i++) {
+      char key[100];
+      snprintf(key, sizeof(key), "B%010d", i);
+      Put(1, key, value);
+    }

-  // push all files to  lower levels. This should
-  // invoke the compaction filter for all 100000 keys.
-  ASSERT_OK(Flush(1));
-  if (option_config_ != kUniversalCompactionMultiLevel &&
-      option_config_ != kUniversalSubcompactions) {
-    dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
-    dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
-  } else {
-    dbfull()->CompactRange(CompactRangeOptions(), handles_[1], nullptr,
-                           nullptr);
-  }
+    // push all files to  lower levels. This should
+    // invoke the compaction filter for all 100000 keys.
+    ASSERT_OK(Flush(1));
+    if (option_config_ != kUniversalCompactionMultiLevel &&
+        option_config_ != kUniversalSubcompactions) {
+      dbfull()->TEST_CompactRange(0, nullptr, nullptr, handles_[1]);
+      dbfull()->TEST_CompactRange(1, nullptr, nullptr, handles_[1]);
+    } else {
+      dbfull()->CompactRange(CompactRangeOptions(), handles_[1], nullptr,
+                             nullptr);
+    }

-  // verify that all keys now have the new value that
-  // was set by the compaction process.
-  for (int i = 0; i < 100001; i++) {
-    char key[100];
-    snprintf(key, sizeof(key), "B%010d", i);
-    std::string newvalue = Get(1, key);
-    ASSERT_EQ(newvalue.compare(NEW_VALUE), 0);
-  }
+    // verify that all keys now have the new value that
+    // was set by the compaction process.
+    for (int i = 0; i < 100001; i++) {
+      char key[100];
+      snprintf(key, sizeof(key), "B%010d", i);
+      std::string newvalue = Get(1, key);
+      ASSERT_EQ(newvalue.compare(NEW_VALUE), 0);
+    }
+  } while (ChangeCompactOptions());
 }

 TEST_F(DBTestCompactionFilter, CompactionFilterWithMergeOperator) {
@@ -646,6 +617,7 @@ TEST_F(DBTestCompactionFilter, CompactionFilterContextManual) {
    ASSERT_OK(iter->status());
    while (iter->Valid()) {
      ParsedInternalKey ikey(Slice(), 0, kTypeValue);
+      ikey.sequence = -1;
      ASSERT_EQ(ParseInternalKey(iter->key(), &ikey), true);
      total++;
      if (ikey.sequence != 0) {
@@ -767,7 +739,7 @@ TEST_F(DBTestCompactionFilter, CompactionFilterIgnoreSnapshot) {
      iter->Next();
    }
    ASSERT_EQ(count, 6);
-    read_options.snapshot = nullptr;
+    read_options.snapshot = 0;
    std::unique_ptr<Iterator> iter1(db_->NewIterator(read_options));
    iter1->SeekToFirst();
    count = 0;
@@ -53,7 +53,7 @@ class FlushedFileCollector : public EventListener {
  FlushedFileCollector() {}
  ~FlushedFileCollector() {}

-  virtual void OnFlushCompleted(DB* /*db*/, const FlushJobInfo& info) override {
+  virtual void OnFlushCompleted(DB* db, const FlushJobInfo& info) override {
    std::lock_guard<std::mutex> lock(mutex_);
    flushed_files_.push_back(info.file_path);
  }
@@ -218,84 +218,6 @@ TEST_P(DBCompactionTestWithParam, CompactionDeletionTrigger) {
  }
 }

-TEST_P(DBCompactionTestWithParam, CompactionsPreserveDeletes) {
-  //  For each options type we test following
-  //  - Enable preserve_deletes
-  //  - write bunch of keys and deletes
-  //  - Set start_seqnum to the beginning; compact; check that keys are present
-  //  - rewind start_seqnum way forward; compact; check that keys are gone
-
-  for (int tid = 0; tid < 3; ++tid) {
-    Options options = DeletionTriggerOptions(CurrentOptions());
-    options.max_subcompactions = max_subcompactions_;
-    options.preserve_deletes=true;
-    options.num_levels = 2;
-
-    if (tid == 1) {
-      options.skip_stats_update_on_db_open = true;
-    } else if (tid == 2) {
-      // third pass with universal compaction
-      options.compaction_style = kCompactionStyleUniversal;
-    }
-
-    DestroyAndReopen(options);
-    Random rnd(301);
-    // highlight the default; all deletes should be preserved
-    SetPreserveDeletesSequenceNumber(0);
-
-    const int kTestSize = kCDTKeysPerBuffer;
-    std::vector<std::string> values;
-    for (int k = 0; k < kTestSize; ++k) {
-      values.push_back(RandomString(&rnd, kCDTValueSize));
-      ASSERT_OK(Put(Key(k), values[k]));
-    }
-
-    for (int k = 0; k < kTestSize; ++k) {
-      ASSERT_OK(Delete(Key(k)));
-    }
-    // to ensure we tackle all tombstones
-    CompactRangeOptions cro;
-    cro.change_level = true;
-    cro.target_level = 2;
-    cro.bottommost_level_compaction = BottommostLevelCompaction::kForce;
-
-    dbfull()->TEST_WaitForFlushMemTable();
-    dbfull()->CompactRange(cro, nullptr, nullptr);
-
-    // check that normal user iterator doesn't see anything
-    Iterator* db_iter = dbfull()->NewIterator(ReadOptions());
-    int i = 0;
-    for (db_iter->SeekToFirst(); db_iter->Valid(); db_iter->Next()) {
-      i++;
-    }
-    ASSERT_EQ(i, 0);
-    delete db_iter;
-
-    // check that iterator that sees internal keys sees tombstones
-    ReadOptions ro;
-    ro.iter_start_seqnum=1;
-    db_iter = dbfull()->NewIterator(ro);
-    i = 0;
-    for (db_iter->SeekToFirst(); db_iter->Valid(); db_iter->Next()) {
-      i++;
-    }
-    ASSERT_EQ(i, 4);
-    delete db_iter;
-
-    // now all deletes should be gone
-    SetPreserveDeletesSequenceNumber(100000000);
-    dbfull()->CompactRange(cro, nullptr, nullptr);
-
-    db_iter = dbfull()->NewIterator(ro);
-    i = 0;
-    for (db_iter->SeekToFirst(); db_iter->Valid(); db_iter->Next()) {
-      i++;
-    }
-    ASSERT_EQ(i, 0);
-    delete db_iter;
-  }
-}
-
 TEST_F(DBCompactionTest, SkipStatsUpdateTest) {
  // This test verify UpdateAccumulatedStats is not on
  // if options.skip_stats_update_on_db_open = true
@@ -1517,176 +1439,6 @@ TEST_F(DBCompactionTest, DeleteFileRange) {
  ASSERT_GT(old_num_files, new_num_files);
 }

-TEST_F(DBCompactionTest, DeleteFilesInRanges) {
-  Options options = CurrentOptions();
-  options.write_buffer_size = 10 * 1024 * 1024;
-  options.max_bytes_for_level_multiplier = 2;
-  options.num_levels = 4;
-  options.max_background_compactions = 3;
-  options.disable_auto_compactions = true;
-
-  DestroyAndReopen(options);
-  int32_t value_size = 10 * 1024;  // 10 KB
-
-  Random rnd(301);
-  std::map<int32_t, std::string> values;
-
-  // file [0 => 100), [100 => 200), ... [900, 1000)
-  for (auto i = 0; i < 10; i++) {
-    for (auto j = 0; j < 100; j++) {
-      auto k = i * 100 + j;
-      values[k] = RandomString(&rnd, value_size);
-      ASSERT_OK(Put(Key(k), values[k]));
-    }
-    ASSERT_OK(Flush());
-  }
-  ASSERT_EQ("10", FilesPerLevel(0));
-  CompactRangeOptions compact_options;
-  compact_options.change_level = true;
-  compact_options.target_level = 2;
-  ASSERT_OK(db_->CompactRange(compact_options, nullptr, nullptr));
-  ASSERT_EQ("0,0,10", FilesPerLevel(0));
-
-  // file [0 => 100), [200 => 300), ... [800, 900)
-  for (auto i = 0; i < 10; i+=2) {
-    for (auto j = 0; j < 100; j++) {
-      auto k = i * 100 + j;
-      ASSERT_OK(Put(Key(k), values[k]));
-    }
-    ASSERT_OK(Flush());
-  }
-  ASSERT_EQ("5,0,10", FilesPerLevel(0));
-  ASSERT_OK(dbfull()->TEST_CompactRange(0, nullptr, nullptr));
-  ASSERT_EQ("0,5,10", FilesPerLevel(0));
-
-  // Delete files in range [0, 299] (inclusive)
-  {
-    auto begin_str1 = Key(0), end_str1 = Key(100);
-    auto begin_str2 = Key(100), end_str2 = Key(200);
-    auto begin_str3 = Key(200), end_str3 = Key(299);
-    Slice begin1(begin_str1), end1(end_str1);
-    Slice begin2(begin_str2), end2(end_str2);
-    Slice begin3(begin_str3), end3(end_str3);
-    std::vector<RangePtr> ranges;
-    ranges.push_back(RangePtr(&begin1, &end1));
-    ranges.push_back(RangePtr(&begin2, &end2));
-    ranges.push_back(RangePtr(&begin3, &end3));
-    ASSERT_OK(DeleteFilesInRanges(db_, db_->DefaultColumnFamily(),
-                                  ranges.data(), ranges.size()));
-    ASSERT_EQ("0,3,7", FilesPerLevel(0));
-
-    // Keys [0, 300) should not exist.
-    for (auto i = 0; i < 300; i++) {
-      ReadOptions ropts;
-      std::string result;
-      auto s = db_->Get(ropts, Key(i), &result);
-      ASSERT_TRUE(s.IsNotFound());
-    }
-    for (auto i = 300; i < 1000; i++) {
-      ASSERT_EQ(Get(Key(i)), values[i]);
-    }
-  }
-
-  // Delete files in range [600, 999) (exclusive)
-  {
-    auto begin_str1 = Key(600), end_str1 = Key(800);
-    auto begin_str2 = Key(700), end_str2 = Key(900);
-    auto begin_str3 = Key(800), end_str3 = Key(999);
-    Slice begin1(begin_str1), end1(end_str1);
-    Slice begin2(begin_str2), end2(end_str2);
-    Slice begin3(begin_str3), end3(end_str3);
-    std::vector<RangePtr> ranges;
-    ranges.push_back(RangePtr(&begin1, &end1));
-    ranges.push_back(RangePtr(&begin2, &end2));
-    ranges.push_back(RangePtr(&begin3, &end3));
-    ASSERT_OK(DeleteFilesInRanges(db_, db_->DefaultColumnFamily(),
-                                  ranges.data(), ranges.size(), false));
-    ASSERT_EQ("0,1,4", FilesPerLevel(0));
-
-    // Keys [600, 900) should not exist.
-    for (auto i = 600; i < 900; i++) {
-      ReadOptions ropts;
-      std::string result;
-      auto s = db_->Get(ropts, Key(i), &result);
-      ASSERT_TRUE(s.IsNotFound());
-    }
-    for (auto i = 300; i < 600; i++) {
-      ASSERT_EQ(Get(Key(i)), values[i]);
-    }
-    for (auto i = 900; i < 1000; i++) {
-      ASSERT_EQ(Get(Key(i)), values[i]);
-    }
-  }
-
-  // Delete all files.
-  {
-    RangePtr range;
-    ASSERT_OK(DeleteFilesInRanges(db_, db_->DefaultColumnFamily(), &range, 1));
-    ASSERT_EQ("", FilesPerLevel(0));
-
-    for (auto i = 0; i < 1000; i++) {
-      ReadOptions ropts;
-      std::string result;
-      auto s = db_->Get(ropts, Key(i), &result);
-      ASSERT_TRUE(s.IsNotFound());
-    }
-  }
-}
-
-TEST_F(DBCompactionTest, DeleteFileRangeFileEndpointsOverlapBug) {
-  // regression test for #2833: groups of files whose user-keys overlap at the
-  // endpoints could be split by `DeleteFilesInRange`. This caused old data to
-  // reappear, either because a new version of the key was removed, or a range
-  // deletion was partially dropped. It could also cause non-overlapping
-  // invariant to be violated if the files dropped by DeleteFilesInRange were
-  // a subset of files that a range deletion spans.
-  const int kNumL0Files = 2;
-  const int kValSize = 8 << 10;  // 8KB
-  Options options = CurrentOptions();
-  options.level0_file_num_compaction_trigger = kNumL0Files;
-  options.target_file_size_base = 1 << 10;  // 1KB
-  DestroyAndReopen(options);
-
-  // The snapshot prevents key 1 from having its old version dropped. The low
-  // `target_file_size_base` ensures two keys will be in each output file.
-  const Snapshot* snapshot = nullptr;
-  Random rnd(301);
-  // The value indicates which flush the key belonged to, which is enough
-  // for us to determine the keys' relative ages. After L0 flushes finish,
-  // files look like:
-  //
-  // File 0: 0 -> vals[0], 1 -> vals[0]
-  // File 1:               1 -> vals[1], 2 -> vals[1]
-  //
-  // Then L0->L1 compaction happens, which outputs keys as follows:
-  //
-  // File 0: 0 -> vals[0], 1 -> vals[1]
-  // File 1:               1 -> vals[0], 2 -> vals[1]
-  //
-  // DeleteFilesInRange shouldn't be allowed to drop just file 0, as that
-  // would cause `1 -> vals[0]` (an older key) to reappear.
-  std::string vals[kNumL0Files];
-  for (int i = 0; i < kNumL0Files; ++i) {
-    vals[i] = RandomString(&rnd, kValSize);
-    Put(Key(i), vals[i]);
-    Put(Key(i + 1), vals[i]);
-    Flush();
-    if (i == 0) {
-      snapshot = db_->GetSnapshot();
-    }
-  }
-  dbfull()->TEST_WaitForCompact();
-
-  // Verify `DeleteFilesInRange` can't drop only file 0 which would cause
-  // "1 -> vals[0]" to reappear.
-  std::string begin_str = Key(0), end_str = Key(1);
-  Slice begin = begin_str, end = end_str;
-  ASSERT_OK(DeleteFilesInRange(db_, db_->DefaultColumnFamily(), &begin, &end));
-  ASSERT_EQ(vals[1], Get(Key(1)));
-
-  db_->ReleaseSnapshot(snapshot);
-}
-
 TEST_P(DBCompactionTestWithParam, TrivialMoveToLastLevelWithFiles) {
  int32_t trivial_move = 0;
  int32_t non_trivial_move = 0;
@@ -2165,7 +1917,7 @@ TEST_F(DBCompactionTest, ManualAutoRace) {

  // The auto compaction is scheduled but waited until here
  TEST_SYNC_POINT("DBCompactionTest::ManualAutoRace:1");
-  // The auto compaction will wait until the manual compaction is registerd
+  // The auto compaction will wait until the the manual compaction is registerd
  // before processing so that it will be cancelled.
  dbfull()->CompactRange(CompactRangeOptions(), handles_[1], nullptr, nullptr);
  ASSERT_EQ("0,1", FilesPerLevel(1));
@@ -2751,7 +2503,6 @@ TEST_P(DBCompactionTestWithParam, ForceBottommostLevelCompaction) {
  rocksdb::SyncPoint::GetInstance()->EnableProcessing();

  Options options = CurrentOptions();
-  options.target_file_size_base = 100000000;
  options.write_buffer_size = 100000000;
  options.max_subcompactions = max_subcompactions_;
  DestroyAndReopen(options);
@@ -2933,449 +2684,6 @@ TEST_P(DBCompactionTestWithParam, IntraL0CompactionDoesNotObsoleteDeletions) {
  ASSERT_TRUE(db_->Get(roptions, Key(0), &result).IsNotFound());
 }

-TEST_F(DBCompactionTest, OptimizedDeletionObsoleting) {
-  // Deletions can be dropped when compacted to non-last level if they fall
-  // outside the lower-level files' key-ranges.
-  const int kNumL0Files = 4;
-  Options options = CurrentOptions();
-  options.level0_file_num_compaction_trigger = kNumL0Files;
-  options.statistics = rocksdb::CreateDBStatistics();
-  DestroyAndReopen(options);
-
-  // put key 1 and 3 in separate L1, L2 files.
-  // So key 0, 2, and 4+ fall outside these levels' key-ranges.
-  for (int level = 2; level >= 1; --level) {
-    for (int i = 0; i < 2; ++i) {
-      Put(Key(2 * i + 1), "val");
-      Flush();
-    }
-    MoveFilesToLevel(level);
-    ASSERT_EQ(2, NumTableFilesAtLevel(level));
-  }
-
-  // Delete keys in range [1, 4]. These L0 files will be compacted with L1:
-  // - Tombstones for keys 2 and 4 can be dropped early.
-  // - Tombstones for keys 1 and 3 must be kept due to L2 files' key-ranges.
-  for (int i = 0; i < kNumL0Files; ++i) {
-    Put(Key(0), "val");  // sentinel to prevent trivial move
-    Delete(Key(i + 1));
-    Flush();
-  }
-  dbfull()->TEST_WaitForCompact();
-
-  for (int i = 0; i < kNumL0Files; ++i) {
-    std::string value;
-    ASSERT_TRUE(db_->Get(ReadOptions(), Key(i + 1), &value).IsNotFound());
-  }
-  ASSERT_EQ(2, options.statistics->getTickerCount(
-                   COMPACTION_OPTIMIZED_DEL_DROP_OBSOLETE));
-  ASSERT_EQ(2,
-            options.statistics->getTickerCount(COMPACTION_KEY_DROP_OBSOLETE));
-}
-
-TEST_F(DBCompactionTest, CompactFilesPendingL0Bug) {
-  // https://www.facebook.com/groups/rocksdb.dev/permalink/1389452781153232/
-  // CompactFiles() had a bug where it failed to pick a compaction when an L0
-  // compaction existed, but marked it as scheduled anyways. It'd never be
-  // unmarked as scheduled, so future compactions or DB close could hang.
-  const int kNumL0Files = 5;
-  Options options = CurrentOptions();
-  options.level0_file_num_compaction_trigger = kNumL0Files - 1;
-  options.max_background_compactions = 2;
-  DestroyAndReopen(options);
-
-  rocksdb::SyncPoint::GetInstance()->LoadDependency(
-      {{"LevelCompactionPicker::PickCompaction:Return",
-        "DBCompactionTest::CompactFilesPendingL0Bug:Picked"},
-       {"DBCompactionTest::CompactFilesPendingL0Bug:ManualCompacted",
-        "DBImpl::BackgroundCompaction:NonTrivial:AfterRun"}});
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-  auto schedule_multi_compaction_token =
-      dbfull()->TEST_write_controler().GetCompactionPressureToken();
-
-  // Files 0-3 will be included in an L0->L1 compaction.
-  //
-  // File 4 will be included in a call to CompactFiles() while the first
-  // compaction is running.
-  for (int i = 0; i < kNumL0Files - 1; ++i) {
-    ASSERT_OK(Put(Key(0), "val"));  // sentinel to prevent trivial move
-    ASSERT_OK(Put(Key(i + 1), "val"));
-    ASSERT_OK(Flush());
-  }
-  TEST_SYNC_POINT("DBCompactionTest::CompactFilesPendingL0Bug:Picked");
-  // file 4 flushed after 0-3 picked
-  ASSERT_OK(Put(Key(kNumL0Files), "val"));
-  ASSERT_OK(Flush());
-
-  // previously DB close would hang forever as this situation caused scheduled
-  // compactions count to never decrement to zero.
-  ColumnFamilyMetaData cf_meta;
-  dbfull()->GetColumnFamilyMetaData(dbfull()->DefaultColumnFamily(), &cf_meta);
-  ASSERT_EQ(kNumL0Files, cf_meta.levels[0].files.size());
-  std::vector<std::string> input_filenames;
-  input_filenames.push_back(cf_meta.levels[0].files.front().name);
-  ASSERT_OK(dbfull()
-                  ->CompactFiles(CompactionOptions(), input_filenames,
-                                 0 /* output_level */));
-  TEST_SYNC_POINT("DBCompactionTest::CompactFilesPendingL0Bug:ManualCompacted");
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-}
-
-TEST_F(DBCompactionTest, CompactFilesOverlapInL0Bug) {
-  // Regression test for bug of not pulling in L0 files that overlap the user-
-  // specified input files in time- and key-ranges.
-  Put(Key(0), "old_val");
-  Flush();
-  Put(Key(0), "new_val");
-  Flush();
-
-  ColumnFamilyMetaData cf_meta;
-  dbfull()->GetColumnFamilyMetaData(dbfull()->DefaultColumnFamily(), &cf_meta);
-  ASSERT_GE(cf_meta.levels.size(), 2);
-  ASSERT_EQ(2, cf_meta.levels[0].files.size());
-
-  // Compacting {new L0 file, L1 file} should pull in the old L0 file since it
-  // overlaps in key-range and time-range.
-  std::vector<std::string> input_filenames;
-  input_filenames.push_back(cf_meta.levels[0].files.front().name);
-  ASSERT_OK(dbfull()->CompactFiles(CompactionOptions(), input_filenames,
-                                   1 /* output_level */));
-  ASSERT_EQ("new_val", Get(Key(0)));
-}
-
-TEST_F(DBCompactionTest, CompactBottomLevelFilesWithDeletions) {
-  // bottom-level files may contain deletions due to snapshots protecting the
-  // deleted keys. Once the snapshot is released, we should see files with many
-  // such deletions undergo single-file compactions.
-  const int kNumKeysPerFile = 1024;
-  const int kNumLevelFiles = 4;
-  const int kValueSize = 128;
-  Options options = CurrentOptions();
-  options.compression = kNoCompression;
-  options.level0_file_num_compaction_trigger = kNumLevelFiles;
-  // inflate it a bit to account for key/metadata overhead
-  options.target_file_size_base = 120 * kNumKeysPerFile * kValueSize / 100;
-  Reopen(options);
-
-  Random rnd(301);
-  const Snapshot* snapshot = nullptr;
-  for (int i = 0; i < kNumLevelFiles; ++i) {
-    for (int j = 0; j < kNumKeysPerFile; ++j) {
-      ASSERT_OK(
-          Put(Key(i * kNumKeysPerFile + j), RandomString(&rnd, kValueSize)));
-    }
-    if (i == kNumLevelFiles - 1) {
-      snapshot = db_->GetSnapshot();
-      // delete every other key after grabbing a snapshot, so these deletions
-      // and the keys they cover can't be dropped until after the snapshot is
-      // released.
-      for (int j = 0; j < kNumLevelFiles * kNumKeysPerFile; j += 2) {
-        ASSERT_OK(Delete(Key(j)));
-      }
-    }
-    Flush();
-    if (i < kNumLevelFiles - 1) {
-      ASSERT_EQ(i + 1, NumTableFilesAtLevel(0));
-    }
-  }
-  dbfull()->TEST_WaitForCompact();
-  ASSERT_EQ(kNumLevelFiles, NumTableFilesAtLevel(1));
-
-  std::vector<LiveFileMetaData> pre_release_metadata, post_release_metadata;
-  db_->GetLiveFilesMetaData(&pre_release_metadata);
-  // just need to bump seqnum so ReleaseSnapshot knows the newest key in the SST
-  // files does not need to be preserved in case of a future snapshot.
-  ASSERT_OK(Put(Key(0), "val"));
-  // release snapshot and wait for compactions to finish. Single-file
-  // compactions should be triggered, which reduce the size of each bottom-level
-  // file without changing file count.
-  db_->ReleaseSnapshot(snapshot);
-  dbfull()->TEST_WaitForCompact();
-  db_->GetLiveFilesMetaData(&post_release_metadata);
-  ASSERT_EQ(pre_release_metadata.size(), post_release_metadata.size());
-
-  for (size_t i = 0; i < pre_release_metadata.size(); ++i) {
-    const auto& pre_file = pre_release_metadata[i];
-    const auto& post_file = post_release_metadata[i];
-    ASSERT_EQ(1, pre_file.level);
-    ASSERT_EQ(1, post_file.level);
-    // each file is smaller than it was before as it was rewritten without
-    // deletion markers/deleted keys.
-    ASSERT_LT(post_file.size, pre_file.size);
-  }
-}
-
-TEST_F(DBCompactionTest, CompactRangeDelayedByL0FileCount) {
-  // Verify that, when `CompactRangeOptions::allow_write_stall == false`, manual
-  // compaction only triggers flush after it's sure stall won't be triggered for
-  // L0 file count going too high.
-  const int kNumL0FilesTrigger = 4;
-  const int kNumL0FilesLimit = 8;
-  // i == 0: verifies normal case where stall is avoided by delay
-  // i == 1: verifies no delay in edge case where stall trigger is same as
-  //         compaction trigger, so stall can't be avoided
-  for (int i = 0; i < 2; ++i) {
-    Options options = CurrentOptions();
-    options.level0_slowdown_writes_trigger = kNumL0FilesLimit;
-    if (i == 0) {
-      options.level0_file_num_compaction_trigger = kNumL0FilesTrigger;
-    } else {
-      options.level0_file_num_compaction_trigger = kNumL0FilesLimit;
-    }
-    Reopen(options);
-
-    if (i == 0) {
-      // ensure the auto compaction doesn't finish until manual compaction has
-      // had a chance to be delayed.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
-          {{"DBImpl::CompactRange:StallWait", "CompactionJob::Run():End"}});
-    } else {
-      // ensure the auto-compaction doesn't finish until manual compaction has
-      // continued without delay.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
-          {{"DBImpl::CompactRange:StallWaitDone", "CompactionJob::Run():End"}});
-    }
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-    Random rnd(301);
-    for (int j = 0; j < kNumL0FilesLimit - 1; ++j) {
-      for (int k = 0; k < 2; ++k) {
-        ASSERT_OK(Put(Key(k), RandomString(&rnd, 1024)));
-      }
-      Flush();
-    }
-    auto manual_compaction_thread = port::Thread([this]() {
-      CompactRangeOptions cro;
-      cro.allow_write_stall = false;
-      db_->CompactRange(cro, nullptr, nullptr);
-    });
-
-    manual_compaction_thread.join();
-    dbfull()->TEST_WaitForCompact();
-    ASSERT_EQ(0, NumTableFilesAtLevel(0));
-    ASSERT_GT(NumTableFilesAtLevel(1), 0);
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  }
-}
-
-TEST_F(DBCompactionTest, CompactRangeDelayedByImmMemTableCount) {
-  // Verify that, when `CompactRangeOptions::allow_write_stall == false`, manual
-  // compaction only triggers flush after it's sure stall won't be triggered for
-  // immutable memtable count going too high.
-  const int kNumImmMemTableLimit = 8;
-  // i == 0: verifies normal case where stall is avoided by delay
-  // i == 1: verifies no delay in edge case where stall trigger is same as flush
-  //         trigger, so stall can't be avoided
-  for (int i = 0; i < 2; ++i) {
-    Options options = CurrentOptions();
-    options.disable_auto_compactions = true;
-    // the delay limit is one less than the stop limit. This test focuses on
-    // avoiding delay limit, but this option sets stop limit, so add one.
-    options.max_write_buffer_number = kNumImmMemTableLimit + 1;
-    if (i == 1) {
-      options.min_write_buffer_number_to_merge = kNumImmMemTableLimit;
-    }
-    Reopen(options);
-
-    if (i == 0) {
-      // ensure the flush doesn't finish until manual compaction has had a
-      // chance to be delayed.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
-          {{"DBImpl::CompactRange:StallWait", "FlushJob::WriteLevel0Table"}});
-    } else {
-      // ensure the flush doesn't finish until manual compaction has continued
-      // without delay.
-      rocksdb::SyncPoint::GetInstance()->LoadDependency(
-          {{"DBImpl::CompactRange:StallWaitDone",
-            "FlushJob::WriteLevel0Table"}});
-    }
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-    Random rnd(301);
-    for (int j = 0; j < kNumImmMemTableLimit - 1; ++j) {
-      ASSERT_OK(Put(Key(0), RandomString(&rnd, 1024)));
-      FlushOptions flush_opts;
-      flush_opts.wait = false;
-      dbfull()->Flush(flush_opts);
-    }
-
-    auto manual_compaction_thread = port::Thread([this]() {
-      CompactRangeOptions cro;
-      cro.allow_write_stall = false;
-      db_->CompactRange(cro, nullptr, nullptr);
-    });
-
-    manual_compaction_thread.join();
-    dbfull()->TEST_WaitForFlushMemTable();
-    ASSERT_EQ(0, NumTableFilesAtLevel(0));
-    ASSERT_GT(NumTableFilesAtLevel(1), 0);
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  }
-}
-
-TEST_F(DBCompactionTest, CompactRangeShutdownWhileDelayed) {
-  // Verify that, when `CompactRangeOptions::allow_write_stall == false`, delay
-  // does not hang if CF is dropped or DB is closed
-  const int kNumL0FilesTrigger = 4;
-  const int kNumL0FilesLimit = 8;
-  Options options = CurrentOptions();
-  options.level0_file_num_compaction_trigger = kNumL0FilesTrigger;
-  options.level0_slowdown_writes_trigger = kNumL0FilesLimit;
-  // i == 0: DB::DropColumnFamily() on CompactRange's target CF unblocks it
-  // i == 1: DB::CancelAllBackgroundWork() unblocks CompactRange. This is to
-  //         simulate what happens during Close as we can't call Close (it
-  //         blocks on the auto-compaction, making a cycle).
-  for (int i = 0; i < 2; ++i) {
-    CreateAndReopenWithCF({"one"}, options);
-    // 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(
-        {{"DBImpl::CompactRange:StallWait",
-          "DBCompactionTest::CompactRangeShutdownWhileDelayed:PreShutdown"},
-         {"DBCompactionTest::CompactRangeShutdownWhileDelayed:PostManual",
-          "CompactionJob::Run():End"}});
-    rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-    Random rnd(301);
-    for (int j = 0; j < kNumL0FilesLimit - 1; ++j) {
-      for (int k = 0; k < 2; ++k) {
-        ASSERT_OK(Put(1, Key(k), RandomString(&rnd, 1024)));
-      }
-      Flush(1);
-    }
-    auto manual_compaction_thread = port::Thread([this]() {
-      CompactRangeOptions cro;
-      cro.allow_write_stall = false;
-      ASSERT_TRUE(db_->CompactRange(cro, handles_[1], nullptr, nullptr)
-                      .IsShutdownInProgress());
-    });
-
-    TEST_SYNC_POINT(
-        "DBCompactionTest::CompactRangeShutdownWhileDelayed:PreShutdown");
-    if (i == 0) {
-      ASSERT_OK(db_->DropColumnFamily(handles_[1]));
-    } else {
-      dbfull()->CancelAllBackgroundWork(false /* wait */);
-    }
-    manual_compaction_thread.join();
-    TEST_SYNC_POINT(
-        "DBCompactionTest::CompactRangeShutdownWhileDelayed:PostManual");
-    dbfull()->TEST_WaitForCompact();
-    rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-  }
-}
-
-TEST_F(DBCompactionTest, CompactRangeSkipFlushAfterDelay) {
-  // Verify that, when `CompactRangeOptions::allow_write_stall == false`,
-  // CompactRange skips its flush if the delay is long enough that the memtables
-  // existing at the beginning of the call have already been flushed.
-  const int kNumL0FilesTrigger = 4;
-  const int kNumL0FilesLimit = 8;
-  Options options = CurrentOptions();
-  options.level0_slowdown_writes_trigger = kNumL0FilesLimit;
-  options.level0_file_num_compaction_trigger = kNumL0FilesTrigger;
-  Reopen(options);
-
-  Random rnd(301);
-  // 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(
-      {{"DBImpl::CompactRange:StallWait",
-        "DBCompactionTest::CompactRangeSkipFlushAfterDelay:PreFlush"},
-       {"DBCompactionTest::CompactRangeSkipFlushAfterDelay:PostFlush",
-        "DBImpl::CompactRange:StallWaitDone"},
-       {"DBImpl::CompactRange:StallWaitDone", "CompactionJob::Run():End"}});
-  rocksdb::SyncPoint::GetInstance()->EnableProcessing();
-
-  for (int i = 0; i < kNumL0FilesLimit - 1; ++i) {
-    for (int j = 0; j < 2; ++j) {
-      ASSERT_OK(Put(Key(j), RandomString(&rnd, 1024)));
-    }
-    Flush();
-  }
-  auto manual_compaction_thread = port::Thread([this]() {
-    CompactRangeOptions cro;
-    cro.allow_write_stall = false;
-    db_->CompactRange(cro, nullptr, nullptr);
-  });
-
-  TEST_SYNC_POINT("DBCompactionTest::CompactRangeSkipFlushAfterDelay:PreFlush");
-  Put(ToString(0), RandomString(&rnd, 1024));
-  Flush();
-  Put(ToString(0), RandomString(&rnd, 1024));
-  TEST_SYNC_POINT("DBCompactionTest::CompactRangeSkipFlushAfterDelay:PostFlush");
-  manual_compaction_thread.join();
-
-  // If CompactRange's flush was skipped, the final Put above will still be
-  // in the active memtable.
-  std::string num_keys_in_memtable;
-  db_->GetProperty(DB::Properties::kNumEntriesActiveMemTable, &num_keys_in_memtable);
-  ASSERT_EQ(ToString(1), num_keys_in_memtable);
-
-  rocksdb::SyncPoint::GetInstance()->DisableProcessing();
-}
-
-TEST_F(DBCompactionTest, CompactRangeFlushOverlappingMemtable) {
-  // Verify memtable only gets flushed if it contains data overlapping the range
-  // provided to `CompactRange`. Tests all kinds of overlap/non-overlap.
-  const int kNumEndpointKeys = 5;
-  std::string keys[kNumEndpointKeys] = {"a", "b", "c", "d", "e"};
-  Options options = CurrentOptions();
-  options.disable_auto_compactions = true;
-  Reopen(options);
-
-  // One extra iteration for nullptr, which means left side of interval is
-  // unbounded.
-  for (int i = 0; i <= kNumEndpointKeys; ++i) {
-    Slice begin;
-    Slice* begin_ptr;
-    if (i == 0) {
-      begin_ptr = nullptr;
-    } else {
-      begin = keys[i - 1];
-      begin_ptr = &begin;
-    }
-    // Start at `i` so right endpoint comes after left endpoint. One extra
-    // iteration for nullptr, which means right side of interval is unbounded.
-    for (int j = std::max(0, i - 1); j <= kNumEndpointKeys; ++j) {
-      Slice end;
-      Slice* end_ptr;
-      if (j == kNumEndpointKeys) {
-        end_ptr = nullptr;
-      } else {
-        end = keys[j];
-        end_ptr = &end;
-      }
-      ASSERT_OK(Put("b", "val"));
-      ASSERT_OK(Put("d", "val"));
-      CompactRangeOptions compact_range_opts;
-      ASSERT_OK(db_->CompactRange(compact_range_opts, begin_ptr, end_ptr));
-
-      uint64_t get_prop_tmp, num_memtable_entries = 0;
-      ASSERT_TRUE(db_->GetIntProperty(DB::Properties::kNumEntriesImmMemTables,
-                                      &get_prop_tmp));
-      num_memtable_entries += get_prop_tmp;
-      ASSERT_TRUE(db_->GetIntProperty(DB::Properties::kNumEntriesActiveMemTable,
-                                      &get_prop_tmp));
-      num_memtable_entries += get_prop_tmp;
-      if (begin_ptr == nullptr || end_ptr == nullptr ||
-          (i <= 4 && j >= 1 && (begin != "c" || end != "c"))) {
-        // In this case `CompactRange`'s range overlapped in some way with the
-        // memtable's range, so flush should've happened. Then "b" and "d" won't
-        // be in the memtable.
-        ASSERT_EQ(0, num_memtable_entries);
-      } else {
-        ASSERT_EQ(2, num_memtable_entries);
-        // flush anyways to prepare for next iteration
-        db_->Flush(FlushOptions());
-      }
-    }
-  }
-}
-
 INSTANTIATE_TEST_CASE_P(DBCompactionTestWithParam, DBCompactionTestWithParam,
                        ::testing::Values(std::make_tuple(1, true),
                                          std::make_tuple(1, false),
@@ -1,94 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-//
-#include "db/db_test_util.h"
-#include "port/stack_trace.h"
-#include "rocksdb/perf_context.h"
-#if !defined(ROCKSDB_LITE)
-#include "util/sync_point.h"
-#endif
-#include <iostream>
-#include <string>
-
-namespace rocksdb {
-
-class DBEncryptionTest : public DBTestBase {
- public:
-  DBEncryptionTest() : DBTestBase("/db_encryption_test") {}
-};
-
-#ifndef ROCKSDB_LITE
-
-TEST_F(DBEncryptionTest, CheckEncrypted) {
-  ASSERT_OK(Put("foo567", "v1.fetdq"));
-  ASSERT_OK(Put("bar123", "v2.dfgkjdfghsd"));
-  Close();
-
-  // Open all files and look for the values we've put in there.
-  // They should not be found if encrypted, otherwise
-  // they should be found.
-  std::vector<std::string> fileNames;
-  auto status = env_->GetChildren(dbname_, &fileNames);
-  ASSERT_OK(status);
-
-  auto defaultEnv = Env::Default();
-  int hits = 0;
-  for (auto it = fileNames.begin() ; it != fileNames.end(); ++it) {
-    if ((*it == "..") || (*it == ".")) {
-      continue;
-    }
-    auto filePath = dbname_ + "/" + *it;
-    unique_ptr<SequentialFile> seqFile;
-    auto envOptions = EnvOptions(CurrentOptions());
-    status = defaultEnv->NewSequentialFile(filePath, &seqFile, envOptions);
-    ASSERT_OK(status);
-
-    uint64_t fileSize;
-    status = defaultEnv->GetFileSize(filePath, &fileSize);
-    ASSERT_OK(status);
-
-    std::string scratch;
-    scratch.reserve(fileSize);
-    Slice data;
-    status = seqFile->Read(fileSize, &data, (char*)scratch.data());
-    ASSERT_OK(status);
-
-    if (data.ToString().find("foo567") != std::string::npos) {
-      hits++; 
-      //std::cout << "Hit in " << filePath << "\n";
-    }
-    if (data.ToString().find("v1.fetdq") != std::string::npos) {
-      hits++; 
-      //std::cout << "Hit in " << filePath << "\n";
-    }
-    if (data.ToString().find("bar123") != std::string::npos) {
-      hits++; 
-      //std::cout << "Hit in " << filePath << "\n";
-    }
-    if (data.ToString().find("v2.dfgkjdfghsd") != std::string::npos) {
-      hits++; 
-      //std::cout << "Hit in " << filePath << "\n";
-    }
-    if (data.ToString().find("dfgk") != std::string::npos) {
-      hits++; 
-      //std::cout << "Hit in " << filePath << "\n";
-    }
-  }
-  if (encrypted_env_) {
-    ASSERT_EQ(hits, 0);
-  } else {
-    ASSERT_GE(hits, 4);
-  }
-}
-
-#endif // ROCKSDB_LITE
-
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  rocksdb::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -57,7 +57,6 @@ Status DBImpl::EnableFileDeletions(bool force) {
      ROCKS_LOG_INFO(immutable_db_options_.info_log, "File Deletions Enabled");
      should_purge_files = true;
      FindObsoleteFiles(&job_context, true);
-      bg_cv_.SignalAll();
    } else {
      ROCKS_LOG_WARN(
          immutable_db_options_.info_log,
@@ -74,7 +73,7 @@ Status DBImpl::EnableFileDeletions(bool force) {
 }

 int DBImpl::IsFileDeletionsEnabled() const {
-  return !disable_delete_obsolete_files_;
+  return disable_delete_obsolete_files_;
 }

 Status DBImpl::GetLiveFiles(std::vector<std::string>& ret,
@@ -93,7 +92,7 @@ Status DBImpl::GetLiveFiles(std::vector<std::string>& ret,
      }
      cfd->Ref();
      mutex_.Unlock();
-      status = FlushMemTable(cfd, FlushOptions(), FlushReason::kGetLiveFiles);
+      status = FlushMemTable(cfd, FlushOptions());
      TEST_SYNC_POINT("DBImpl::GetLiveFiles:1");
      TEST_SYNC_POINT("DBImpl::GetLiveFiles:2");
      mutex_.Lock();
@@ -142,18 +141,6 @@ Status DBImpl::GetLiveFiles(std::vector<std::string>& ret,
 }

 Status DBImpl::GetSortedWalFiles(VectorLogPtr& files) {
-  {
-    // If caller disabled deletions, this function should return files that are
-    // guaranteed not to be deleted until deletions are re-enabled. We need to
-    // wait for pending purges to finish since WalManager doesn't know which
-    // files are going to be purged. Additional purges won't be scheduled as
-    // long as deletions are disabled (so the below loop must terminate).
-    InstrumentedMutexLock l(&mutex_);
-    while (disable_delete_obsolete_files_ > 0 &&
-           pending_purge_obsolete_files_ > 0) {
-      bg_cv_.Wait();
-    }
-  }
  return wal_manager_.GetSortedWalFiles(files);
 }

@@ -126,41 +126,6 @@ TEST_F(DBFlushTest, FlushInLowPriThreadPool) {
  ASSERT_EQ(1, num_compactions);
 }

-TEST_F(DBFlushTest, ManualFlushWithMinWriteBufferNumberToMerge) {
-  Options options = CurrentOptions();
-  options.write_buffer_size = 100;
-  options.max_write_buffer_number = 4;
-  options.min_write_buffer_number_to_merge = 3;
-  Reopen(options);
-
-  SyncPoint::GetInstance()->LoadDependency(
-      {{"DBImpl::BGWorkFlush",
-        "DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:1"},
-       {"DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:2",
-        "FlushJob::WriteLevel0Table"}});
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  ASSERT_OK(Put("key1", "value1"));
-
-  port::Thread t([&]() {
-    // The call wait for flush to finish, i.e. with flush_options.wait = true.
-    ASSERT_OK(Flush());
-  });
-
-  // Wait for flush start.
-  TEST_SYNC_POINT("DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:1");
-  // Insert a second memtable before the manual flush finish.
-  // At the end of the manual flush job, it will check if further flush
-  // is needed, but it will not trigger flush of the second memtable because
-  // min_write_buffer_number_to_merge is not reached.
-  ASSERT_OK(Put("key2", "value2"));
-  ASSERT_OK(dbfull()->TEST_SwitchMemtable());
-  TEST_SYNC_POINT("DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge:2");
-
-  // Manual flush should return, without waiting for flush indefinitely.
-  t.join();
-}
-
 TEST_P(DBFlushDirectIOTest, DirectIO) {
  Options options;
  options.create_if_missing = true;
@@ -185,26 +150,6 @@ TEST_P(DBFlushDirectIOTest, DirectIO) {
  delete options.env;
 }

-TEST_F(DBFlushTest, FlushError) {
-  Options options;
-  std::unique_ptr<FaultInjectionTestEnv> fault_injection_env(
-      new FaultInjectionTestEnv(env_));
-  options.write_buffer_size = 100;
-  options.max_write_buffer_number = 4;
-  options.min_write_buffer_number_to_merge = 3;
-  options.disable_auto_compactions = true;
-  options.env = fault_injection_env.get();
-  Reopen(options);
-
-  ASSERT_OK(Put("key1", "value1"));
-  ASSERT_OK(Put("key2", "value2"));
-  fault_injection_env->SetFilesystemActive(false);
-  Status s = dbfull()->TEST_SwitchMemtable();
-  fault_injection_env->SetFilesystemActive(true);
-  Destroy(options);
-  ASSERT_NE(s, Status::OK());
-}
-
 INSTANTIATE_TEST_CASE_P(DBFlushDirectIOTest, DBFlushDirectIOTest,
                        testing::Bool());

@@ -14,6 +14,7 @@
 #include <limits>
 #include <list>
 #include <map>
+#include <queue>
 #include <set>
 #include <string>
 #include <utility>
@@ -27,9 +28,6 @@
 #include "db/flush_scheduler.h"
 #include "db/internal_stats.h"
 #include "db/log_writer.h"
-#include "db/pre_release_callback.h"
-#include "db/read_callback.h"
-#include "db/snapshot_checker.h"
 #include "db/snapshot_impl.h"
 #include "db/version_edit.h"
 #include "db/wal_manager.h"
@@ -54,13 +52,12 @@

 namespace rocksdb {

-class Arena;
-class ArenaWrappedDBIter;
 class MemTable;
 class TableCache;
 class Version;
 class VersionEdit;
 class VersionSet;
+class Arena;
 class WriteCallback;
 struct JobContext;
 struct ExternalSstFileInfo;
@@ -68,8 +65,7 @@ struct MemTableInfo;

 class DBImpl : public DB {
 public:
-  DBImpl(const DBOptions& options, const std::string& dbname,
-         const bool seq_per_batch = false);
+  DBImpl(const DBOptions& options, const std::string& dbname);
  virtual ~DBImpl();

  // Implementations of the DB interface
@@ -97,14 +93,6 @@ class DBImpl : public DB {
  virtual Status Get(const ReadOptions& options,
                     ColumnFamilyHandle* column_family, const Slice& key,
                     PinnableSlice* value) override;
-
-  // Function that Get and KeyMayExist call with no_io true or false
-  // Note: 'value_found' from KeyMayExist propagates here
-  Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
-                 const Slice& key, PinnableSlice* value,
-                 bool* value_found = nullptr, ReadCallback* callback = nullptr,
-                 bool* is_blob_index = nullptr);
-
  using DB::MultiGet;
  virtual std::vector<Status> MultiGet(
      const ReadOptions& options,
@@ -135,7 +123,6 @@ class DBImpl : public DB {
                           ColumnFamilyHandle* column_family, const Slice& key,
                           std::string* value,
                           bool* value_found = nullptr) override;
-
  using DB::NewIterator;
  virtual Iterator* NewIterator(const ReadOptions& options,
                                ColumnFamilyHandle* column_family) override;
@@ -143,22 +130,15 @@ class DBImpl : public DB {
      const ReadOptions& options,
      const std::vector<ColumnFamilyHandle*>& column_families,
      std::vector<Iterator*>* iterators) override;
-  ArenaWrappedDBIter* NewIteratorImpl(const ReadOptions& options,
-                                      ColumnFamilyData* cfd,
-                                      SequenceNumber snapshot,
-                                      ReadCallback* read_callback,
-                                      bool allow_blob = false,
-                                      bool allow_refresh = true);
-
  virtual const Snapshot* GetSnapshot() override;
  virtual void ReleaseSnapshot(const Snapshot* snapshot) override;
  using DB::GetProperty;
  virtual bool GetProperty(ColumnFamilyHandle* column_family,
                           const Slice& property, std::string* value) override;
  using DB::GetMapProperty;
-  virtual bool GetMapProperty(
-      ColumnFamilyHandle* column_family, const Slice& property,
-      std::map<std::string, std::string>* value) override;
+  virtual bool GetMapProperty(ColumnFamilyHandle* column_family,
+                              const Slice& property,
+                              std::map<std::string, double>* value) override;
  using DB::GetIntProperty;
  virtual bool GetIntProperty(ColumnFamilyHandle* column_family,
                              const Slice& property, uint64_t* value) override;
@@ -185,9 +165,7 @@ class DBImpl : public DB {
                              ColumnFamilyHandle* column_family,
                              const std::vector<std::string>& input_file_names,
                              const int output_level,
-                              const int output_path_id = -1,
-                              std::vector<std::string>* const output_file_names
-                              = nullptr) override;
+                              const int output_path_id = -1) override;

  virtual Status PauseBackgroundWork() override;
  virtual Status ContinueBackgroundWork() override;
@@ -219,19 +197,11 @@ class DBImpl : public DB {
  using DB::Flush;
  virtual Status Flush(const FlushOptions& options,
                       ColumnFamilyHandle* column_family) override;
-  virtual Status FlushWAL(bool sync) override;
  virtual Status SyncWAL() override;

  virtual SequenceNumber GetLatestSequenceNumber() const override;
-  // REQUIRES: joined the main write queue if two_write_queues is disabled, and
-  // the second write queue otherwise.
-  virtual void SetLastPublishedSequence(SequenceNumber seq);
-  // Returns LastSequence in last_seq_same_as_publish_seq_
-  // mode and LastAllocatedSequence otherwise. This is useful when visiblility
-  // depends also on data written to the WAL but not to the memtable.
-  SequenceNumber TEST_GetLastVisibleSequence() const;

-  virtual bool SetPreserveDeletesSequenceNumber(SequenceNumber seqnum) override;
+  bool HasActiveSnapshotLaterThanSN(SequenceNumber sn);

 #ifndef ROCKSDB_LITE
  using DB::ResetStats;
@@ -250,9 +220,8 @@ class DBImpl : public DB {
      const TransactionLogIterator::ReadOptions&
          read_options = TransactionLogIterator::ReadOptions()) override;
  virtual Status DeleteFile(std::string name) override;
-  Status DeleteFilesInRanges(ColumnFamilyHandle* column_family,
-                             const RangePtr* ranges, size_t n,
-                             bool include_end = true);
+  Status DeleteFilesInRange(ColumnFamilyHandle* column_family,
+                            const Slice* begin, const Slice* end);

  virtual void GetLiveFilesMetaData(
      std::vector<LiveFileMetaData>* metadata) override;
@@ -265,11 +234,11 @@ class DBImpl : public DB {
      ColumnFamilyHandle* column_family,
      ColumnFamilyMetaData* metadata) override;

+  // experimental API
  Status SuggestCompactRange(ColumnFamilyHandle* column_family,
-                             const Slice* begin, const Slice* end) override;
+                             const Slice* begin, const Slice* end);

-  Status PromoteL0(ColumnFamilyHandle* column_family,
-                   int target_level) override;
+  Status PromoteL0(ColumnFamilyHandle* column_family, int target_level);

  // Similar to Write() but will call the callback once on the single write
  // thread to determine whether it is safe to perform the write.
@@ -315,8 +284,7 @@ class DBImpl : public DB {
  // TODO(andrewkr): this API need to be aware of range deletion operations
  Status GetLatestSequenceForKey(SuperVersion* sv, const Slice& key,
                                 bool cache_only, SequenceNumber* seq,
-                                 bool* found_record_for_key,
-                                 bool* is_blob_index = nullptr);
+                                 bool* found_record_for_key);

  using DB::IngestExternalFile;
  virtual Status IngestExternalFile(
@@ -324,8 +292,6 @@ class DBImpl : public DB {
      const std::vector<std::string>& external_files,
      const IngestExternalFileOptions& ingestion_options) override;

-  virtual Status VerifyChecksum() override;
-
 #endif  // ROCKSDB_LITE

  // Similar to GetSnapshot(), but also lets the db know that this snapshot
@@ -362,7 +328,7 @@ class DBImpl : public DB {
                           ColumnFamilyHandle* column_family = nullptr,
                           bool disallow_trivial_move = false);

-  void TEST_SwitchWAL();
+  void TEST_HandleWALFull();

  bool TEST_UnableToFlushOldestLog() {
    return unable_to_flush_oldest_log_;
@@ -372,8 +338,6 @@ class DBImpl : public DB {
    return alive_log_files_.begin()->getting_flushed;
  }

-  Status TEST_SwitchMemtable(ColumnFamilyData* cfd = nullptr);
-
  // Force current memtable contents to be flushed.
  Status TEST_FlushMemTable(bool wait = true,
                            ColumnFamilyHandle* cfh = nullptr);
@@ -382,9 +346,7 @@ class DBImpl : public DB {
  Status TEST_WaitForFlushMemTable(ColumnFamilyHandle* column_family = nullptr);

  // Wait for any compaction
-  // We add a bool parameter to wait for unscheduledCompactions_ == 0, but this
-  // is only for the special test of CancelledCompactions
-  Status TEST_WaitForCompact(bool waitUnscheduled = false);
+  Status TEST_WaitForCompact();

  // Return the maximum overlapping data (in bytes) at next level for any
  // file at a level >= 1.
@@ -394,9 +356,6 @@ class DBImpl : public DB {
  // Return the current manifest file no.
  uint64_t TEST_Current_Manifest_FileNo();

-  // Returns the number that'll be assigned to the next file that's created.
-  uint64_t TEST_Current_Next_FileNo();
-
  // get total level0 file size. Only for testing.
  uint64_t TEST_GetLevel0TotalSize();

@@ -438,8 +397,6 @@ class DBImpl : public DB {

  uint64_t TEST_FindMinLogContainingOutstandingPrep();
  uint64_t TEST_FindMinPrepLogReferencedByMemTable();
-  size_t TEST_PreparedSectionCompletedSize();
-  size_t TEST_LogsWithPrepSize();

  int TEST_BGCompactionsAllowed() const;
  int TEST_BGFlushesAllowed() const;
@@ -473,11 +430,9 @@ class DBImpl : public DB {
                         bool no_full_scan = false);

  // Diffs the files listed in filenames and those that do not
-  // belong to live files are possibly removed. Also, removes all the
+  // belong to live files are posibly removed. Also, removes all the
  // files in sst_delete_files and log_delete_files.
  // It is not necessary to hold the mutex when invoking this method.
-  // If FindObsoleteFiles() was run, we need to also run
-  // PurgeObsoleteFiles(), even if disable_delete_obsolete_files_ is true
  void PurgeObsoleteFiles(const JobContext& background_contet,
                          bool schedule_only = false);

@@ -504,9 +459,6 @@ class DBImpl : public DB {
  // mutex is held.
  SuperVersion* GetAndRefSuperVersion(uint32_t column_family_id);

-  // Un-reference the super version and clean it up if it is the last reference.
-  void CleanupSuperVersion(SuperVersion* sv);
-
  // Un-reference the super version and return it to thread local cache if
  // needed. If it is the last reference of the super version. Clean it up
  // after un-referencing it.
@@ -541,12 +493,6 @@ class DBImpl : public DB {

  const WriteController& write_controller() { return write_controller_; }

-  InternalIterator* NewInternalIterator(const ReadOptions&,
-                                        ColumnFamilyData* cfd,
-                                        SuperVersion* super_version,
-                                        Arena* arena,
-                                        RangeDelAggregator* range_del_agg);
-
  // hollow transactions shell used for recovery.
  // these will then be passed to TransactionDB so that
  // locks can be reacquired before writing can resume.
@@ -554,20 +500,9 @@ class DBImpl : public DB {
    uint64_t log_number_;
    std::string name_;
    WriteBatch* batch_;
-    // The seq number of the first key in the batch
-    SequenceNumber seq_;
-    // Number of sub-batched. A new sub-batch is created if we txn attempts to
-    // inserts a duplicate key,seq to memtable. This is currently used in
-    // WritePrparedTxn
-    size_t batch_cnt_;
    explicit RecoveredTransaction(const uint64_t log, const std::string& name,
-                                  WriteBatch* batch, SequenceNumber seq,
-                                  size_t batch_cnt)
-        : log_number_(log),
-          name_(name),
-          batch_(batch),
-          seq_(seq),
-          batch_cnt_(batch_cnt) {}
+                                  WriteBatch* batch)
+        : log_number_(log), name_(name), batch_(batch) {}

    ~RecoveredTransaction() { delete batch_; }
  };
@@ -589,10 +524,8 @@ class DBImpl : public DB {
  }

  void InsertRecoveredTransaction(const uint64_t log, const std::string& name,
-                                  WriteBatch* batch, SequenceNumber seq,
-                                  size_t batch_cnt) {
-    recovered_transactions_[name] =
-        new RecoveredTransaction(log, name, batch, seq, batch_cnt);
+                                  WriteBatch* batch) {
+    recovered_transactions_[name] = new RecoveredTransaction(log, name, batch);
    MarkLogAsContainingPrepSection(log);
  }

@@ -619,26 +552,12 @@ class DBImpl : public DB {
    logs_to_free_queue_.push_back(log_writer);
  }

-  void SetSnapshotChecker(SnapshotChecker* snapshot_checker);
-
-  InstrumentedMutex* mutex() { return &mutex_; }
-
  Status NewDB();

-  // This is to be used only by internal rocksdb classes.
-  static Status Open(const DBOptions& db_options, const std::string& name,
-                     const std::vector<ColumnFamilyDescriptor>& column_families,
-                     std::vector<ColumnFamilyHandle*>* handles, DB** dbptr,
-                     const bool seq_per_batch);
-
-  virtual Status Close() override;
-
 protected:
  Env* const env_;
  const std::string dbname_;
  unique_ptr<VersionSet> versions_;
-  // Flag to check whether we allocated and own the info log file
-  bool own_info_log_;
  const DBOptions initial_db_options_;
  const ImmutableDBOptions immutable_db_options_;
  MutableDBOptions mutable_db_options_;
@@ -646,6 +565,12 @@ class DBImpl : public DB {
  std::unordered_map<std::string, RecoveredTransaction*>
      recovered_transactions_;

+  InternalIterator* NewInternalIterator(const ReadOptions&,
+                                        ColumnFamilyData* cfd,
+                                        SuperVersion* super_version,
+                                        Arena* arena,
+                                        RangeDelAggregator* range_del_agg);
+
  // Except in DB::Open(), WriteOptionsFile can only be called when:
  // Persist options to options file.
  // If need_mutex_lock = false, the method will lock DB mutex.
@@ -684,83 +609,47 @@ class DBImpl : public DB {

  void EraseThreadStatusDbInfo() const;

-  // If disable_memtable is set the application logic must guarantee that the
-  // batch will still be skipped from memtable during the recovery. In
-  // WriteCommitted it is guarnateed since disable_memtable is used for prepare
-  // batch which will be written to memtable later during the commit, and in
-  // WritePrepared it is guaranteed since it will be used only for WAL markers
-  // which will never be written to memtable.
-  // batch_cnt is expected to be non-zero in seq_per_batch mode and indicates
-  // the number of sub-patches. A sub-patch is a subset of the write batch that
-  // does not have duplicate keys.
  Status WriteImpl(const WriteOptions& options, WriteBatch* updates,
                   WriteCallback* callback = nullptr,
                   uint64_t* log_used = nullptr, uint64_t log_ref = 0,
-                   bool disable_memtable = false, uint64_t* seq_used = nullptr,
-                   size_t batch_cnt = 0,
-                   PreReleaseCallback* pre_release_callback = nullptr);
+                   bool disable_memtable = false);

  Status PipelinedWriteImpl(const WriteOptions& options, WriteBatch* updates,
                            WriteCallback* callback = nullptr,
                            uint64_t* log_used = nullptr, uint64_t log_ref = 0,
-                            bool disable_memtable = false,
-                            uint64_t* seq_used = nullptr);
-
-  // batch_cnt is expected to be non-zero in seq_per_batch mode and indicates
-  // the number of sub-patches. A sub-patch is a subset of the write batch that
-  // does not have duplicate keys.
-  Status WriteImplWALOnly(const WriteOptions& options, WriteBatch* updates,
-                          WriteCallback* callback = nullptr,
-                          uint64_t* log_used = nullptr, uint64_t log_ref = 0,
-                          uint64_t* seq_used = nullptr, size_t batch_cnt = 0,
-                          PreReleaseCallback* pre_release_callback = nullptr);
+                            bool disable_memtable = false);

  uint64_t FindMinLogContainingOutstandingPrep();
  uint64_t FindMinPrepLogReferencedByMemTable();
-  // write cached_recoverable_state_ to memtable if it is not empty
-  // The writer must be the leader in write_thread_ and holding mutex_
-  Status WriteRecoverableState();
-
-  // Actual implementation of Close()
-  Status CloseImpl();

 private:
  friend class DB;
  friend class InternalStats;
-  friend class PessimisticTransaction;
-  friend class WriteCommittedTxn;
-  friend class WritePreparedTxn;
-  friend class WritePreparedTxnDB;
-  friend class WriteBatchWithIndex;
+  friend class TransactionImpl;
 #ifndef ROCKSDB_LITE
  friend class ForwardIterator;
 #endif
  friend struct SuperVersion;
  friend class CompactedDBImpl;
 #ifndef NDEBUG
-  friend class DBTest2_ReadCallbackTest_Test;
-  friend class WriteCallbackTest_WriteWithCallbackTest_Test;
  friend class XFTransactionWriteHandler;
-  friend class DBBlobIndexTest;
 #endif
  struct CompactionState;

  struct WriteContext {
-    SuperVersionContext superversion_context;
+    autovector<SuperVersion*> superversions_to_free_;
    autovector<MemTable*> memtables_to_free_;

-    explicit WriteContext(bool create_superversion = false)
-        : superversion_context(create_superversion) {}
-
    ~WriteContext() {
-      superversion_context.Clean();
+      for (auto& sv : superversions_to_free_) {
+        delete sv;
+      }
      for (auto& m : memtables_to_free_) {
        delete m;
      }
    }
  };

-  struct PrepickedCompaction;
  struct PurgeFileInfo;

  // Recover the descriptor from persistent storage.  May do a significant
@@ -783,8 +672,9 @@ class DBImpl : public DB {
  // Delete any unneeded files and stale in-memory entries.
  void DeleteObsoleteFiles();
  // Delete obsolete files and log status and information of file deletion
-  void DeleteObsoleteFileImpl(int job_id, const std::string& fname,
-                              FileType type, uint64_t number, uint32_t path_id);
+  void DeleteObsoleteFileImpl(Status file_deletion_status, int job_id,
+                              const std::string& fname, FileType type,
+                              uint64_t number, uint32_t path_id);

  // Background process needs to call
  //     auto x = CaptureCurrentFileNumberInPendingOutputs()
@@ -835,22 +725,17 @@ class DBImpl : public DB {

  Status ScheduleFlushes(WriteContext* context);

-  Status SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context,
-                        FlushReason flush_reason = FlushReason::kOthers);
+  Status SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context);

  // Force current memtable contents to be flushed.
  Status FlushMemTable(ColumnFamilyData* cfd, const FlushOptions& options,
-                       FlushReason flush_reason, bool writes_stopped = false);
+                       bool writes_stopped = false);

-  // Wait for memtable flushed.
-  // If flush_memtable_id is non-null, wait until the memtable with the ID
-  // gets flush. Otherwise, wait until the column family don't have any
-  // memtable pending flush.
-  Status WaitForFlushMemTable(ColumnFamilyData* cfd,
-                              const uint64_t* flush_memtable_id = nullptr);
+  // Wait for memtable flushed
+  Status WaitForFlushMemTable(ColumnFamilyData* cfd);

  // REQUIRES: mutex locked
-  Status SwitchWAL(WriteContext* write_context);
+  Status HandleWALFull(WriteContext* write_context);

  // REQUIRES: mutex locked
  Status HandleWriteBufferFull(WriteContext* write_context);
@@ -859,24 +744,12 @@ class DBImpl : public DB {
  Status PreprocessWrite(const WriteOptions& write_options, bool* need_log_sync,
                         WriteContext* write_context);

-  WriteBatch* MergeBatch(const WriteThread::WriteGroup& write_group,
-                         WriteBatch* tmp_batch, size_t* write_with_wal,
-                         WriteBatch** to_be_cached_state);
-
-  Status WriteToWAL(const WriteBatch& merged_batch, log::Writer* log_writer,
-                    uint64_t* log_used, uint64_t* log_size);
-
  Status WriteToWAL(const WriteThread::WriteGroup& write_group,
-                    log::Writer* log_writer, uint64_t* log_used,
-                    bool need_log_sync, bool need_log_dir_sync,
-                    SequenceNumber sequence);
-
-  Status ConcurrentWriteToWAL(const WriteThread::WriteGroup& write_group,
-                              uint64_t* log_used, SequenceNumber* last_sequence,
-                              size_t seq_inc);
+                    log::Writer* log_writer, bool need_log_sync,
+                    bool need_log_dir_sync, SequenceNumber sequence);

  // Used by WriteImpl to update bg_error_ if paranoid check is enabled.
-  void WriteStatusCheck(const Status& status);
+  void ParanoidCheck(const Status& status);

  // Used by WriteImpl to update bg_error_ in case of memtable insert error.
  void MemTableInsertStatusCheck(const Status& memtable_insert_status);
@@ -886,7 +759,6 @@ class DBImpl : public DB {
  Status CompactFilesImpl(const CompactionOptions& compact_options,
                          ColumnFamilyData* cfd, Version* version,
                          const std::vector<std::string>& input_file_names,
-                          std::vector<std::string>* const output_file_names,
                          const int output_level, int output_path_id,
                          JobContext* job_context, LogBuffer* log_buffer);

@@ -903,24 +775,19 @@ class DBImpl : public DB {
  ColumnFamilyData* GetColumnFamilyDataByName(const std::string& cf_name);

  void MaybeScheduleFlushOrCompaction();
-  void SchedulePendingFlush(ColumnFamilyData* cfd, FlushReason flush_reason);
+  void SchedulePendingFlush(ColumnFamilyData* cfd);
  void SchedulePendingCompaction(ColumnFamilyData* cfd);
  void SchedulePendingPurge(std::string fname, FileType type, uint64_t number,
                            uint32_t path_id, int job_id);
  static void BGWorkCompaction(void* arg);
-  // Runs a pre-chosen universal compaction involving bottom level in a
-  // separate, bottom-pri thread pool.
-  static void BGWorkBottomCompaction(void* arg);
  static void BGWorkFlush(void* db);
  static void BGWorkPurge(void* arg);
  static void UnscheduleCallback(void* arg);
-  void BackgroundCallCompaction(PrepickedCompaction* prepicked_compaction,
-                                Env::Priority bg_thread_pri);
+  void BackgroundCallCompaction(void* arg);
  void BackgroundCallFlush();
  void BackgroundCallPurge();
  Status BackgroundCompaction(bool* madeProgress, JobContext* job_context,
-                              LogBuffer* log_buffer,
-                              PrepickedCompaction* prepicked_compaction);
+                              LogBuffer* log_buffer, void* m = 0);
  Status BackgroundFlush(bool* madeProgress, JobContext* job_context,
                         LogBuffer* log_buffer);

@@ -942,7 +809,7 @@ class DBImpl : public DB {
  // helper functions for adding and removing from flush & compaction queues
  void AddToCompactionQueue(ColumnFamilyData* cfd);
  ColumnFamilyData* PopFirstFromCompactionQueue();
-  void AddToFlushQueue(ColumnFamilyData* cfd, FlushReason flush_reason);
+  void AddToFlushQueue(ColumnFamilyData* cfd);
  ColumnFamilyData* PopFirstFromFlushQueue();

  // helper function to call after some of the logs_ were synced
@@ -952,24 +819,17 @@ class DBImpl : public DB {

  uint64_t GetMaxTotalWalSize() const;

-  Status CloseHelper();
-
  // table_cache_ provides its own synchronization
  std::shared_ptr<Cache> table_cache_;

  // Lock over the persistent DB state.  Non-nullptr iff successfully acquired.
  FileLock* db_lock_;

-  // In addition to mutex_, log_write_mutex_ protected writes to logs_ and
-  // logfile_number_. With two_write_queues it also protects alive_log_files_,
-  // and log_empty_. Refer to the definition of each variable below for more
-  // details.
-  InstrumentedMutex log_write_mutex_;
+  // The mutex for options file related operations.
+  // NOTE: should never acquire options_file_mutex_ and mutex_ at the
+  //       same time.
+  InstrumentedMutex options_files_mutex_;
  // State below is protected by mutex_
-  // With two_write_queues enabled, some of the variables that accessed during
-  // WriteToWAL need different synchronization: log_empty_, alive_log_files_,
-  // logs_, logfile_number_. Refer to the definition of each variable below for
-  // more description.
  mutable InstrumentedMutex mutex_;

  std::atomic<bool> shutting_down_;
@@ -982,25 +842,11 @@ class DBImpl : public DB {
  // (i.e. whenever a flush is done, even if it didn't make any progress)
  // * whenever there is an error in background purge, flush or compaction
  // * whenever num_running_ingest_file_ goes to 0.
-  // * whenever pending_purge_obsolete_files_ goes to 0.
-  // * whenever disable_delete_obsolete_files_ goes to 0.
-  // * whenever SetOptions successfully updates options.
-  // * whenever a column family is dropped.
  InstrumentedCondVar bg_cv_;
-  // Writes are protected by locking both mutex_ and log_write_mutex_, and reads
-  // must be under either mutex_ or log_write_mutex_. Since after ::Open,
-  // logfile_number_ is currently updated only in write_thread_, it can be read
-  // from the same write_thread_ without any locks.
  uint64_t logfile_number_;
  std::deque<uint64_t>
-      log_recycle_files_;  // a list of log files that we can recycle
+      log_recycle_files;  // a list of log files that we can recycle
  bool log_dir_synced_;
-  // Without two_write_queues, read and writes to log_empty_ are protected by
-  // mutex_. Since it is currently updated/read only in write_thread_, it can be
-  // accessed from the same write_thread_ without any locks. With
-  // two_write_queues writes, where it can be updated in different threads,
-  // read and writes are protected by log_write_mutex_ instead. This is to avoid
-  // expesnive mutex_ lock during WAL write, which update log_empty_.
  bool log_empty_;
  ColumnFamilyHandleImpl* default_cf_handle_;
  InternalStats* default_cf_internal_stats_;
@@ -1023,11 +869,9 @@ class DBImpl : public DB {
      writer = nullptr;
      return w;
    }
-    Status ClearWriter() {
-      Status s = writer->WriteBuffer();
+    void ClearWriter() {
      delete writer;
      writer = nullptr;
-      return s;
    }

    uint64_t number;
@@ -1037,38 +881,17 @@ class DBImpl : public DB {
    // true for some prefix of logs_
    bool getting_synced = false;
  };
-  // Without two_write_queues, read and writes to alive_log_files_ are
-  // protected by mutex_. However since back() is never popped, and push_back()
-  // is done only from write_thread_, the same thread can access the item
-  // reffered by back() without mutex_. With two_write_queues_, writes
-  // are protected by locking both mutex_ and log_write_mutex_, and reads must
-  // be under either mutex_ or log_write_mutex_.
  std::deque<LogFileNumberSize> alive_log_files_;
  // Log files that aren't fully synced, and the current log file.
  // Synchronization:
-  //  - push_back() is done from write_thread_ with locked mutex_ and
-  //  log_write_mutex_
-  //  - pop_front() is done from any thread with locked mutex_ and
-  //  log_write_mutex_
-  //  - reads are done with either locked mutex_ or log_write_mutex_
+  //  - push_back() is done from write thread with locked mutex_,
+  //  - pop_front() is done from any thread with locked mutex_,
  //  - back() and items with getting_synced=true are not popped,
-  //  - The same thread that sets getting_synced=true will reset it.
-  //  - it follows that the object referred by back() can be safely read from
-  //  the write_thread_ without using mutex
-  //  - it follows that the items with getting_synced=true can be safely read
-  //  from the same thread that has set getting_synced=true
+  //  - it follows that write thread with unlocked mutex_ can safely access
+  //    back() and items with getting_synced=true.
  std::deque<LogWriterNumber> logs_;
  // Signaled when getting_synced becomes false for some of the logs_.
  InstrumentedCondVar log_sync_cv_;
-  // This is the app-level state that is written to the WAL but will be used
-  // only during recovery. Using this feature enables not writing the state to
-  // memtable on normal writes and hence improving the throughput. Each new
-  // write of the state will replace the previous state entirely even if the
-  // keys in the two consecuitive states do not overlap.
-  // It is protected by log_write_mutex_ when two_write_queues_ is enabled.
-  // Otherwise only the heaad of write_thread_ can access it.
-  WriteBatch cached_recoverable_state_;
-  std::atomic<bool> cached_recoverable_state_empty_ = {true};
  std::atomic<uint64_t> total_log_size_;
  // only used for dynamically adjusting max_total_wal_size. it is a sum of
  // [write_buffer_size * max_write_buffer_number] over all column families
@@ -1114,10 +937,8 @@ class DBImpl : public DB {
  WriteBufferManager* write_buffer_manager_;

  WriteThread write_thread_;
+
  WriteBatch tmp_batch_;
-  // The write thread when the writers have no memtable write. This will be used
-  // in 2PC to batch the prepares separately from the serial commit.
-  WriteThread nonmem_write_thread_;

  WriteController write_controller_;

@@ -1125,8 +946,6 @@ class DBImpl : public DB {

  // Size of the last batch group. In slowdown mode, next write needs to
  // sleep if it uses up the quota.
-  // Note: This is to protect memtable and compaction. If the batch only writes
-  // to the WAL its size need not to be included in this.
  uint64_t last_batch_group_size_;

  FlushScheduler flush_scheduler_;
@@ -1190,10 +1009,6 @@ class DBImpl : public DB {
  int unscheduled_flushes_;
  int unscheduled_compactions_;

-  // count how many background compactions are running or have been scheduled in
-  // the BOTTOM pool
-  int bg_bottom_compaction_scheduled_;
-
  // count how many background compactions are running or have been scheduled
  int bg_compaction_scheduled_;

@@ -1210,7 +1025,7 @@ class DBImpl : public DB {
  int bg_purge_scheduled_;

  // Information for a manual compaction
-  struct ManualCompactionState {
+  struct ManualCompaction {
    ColumnFamilyData* cfd;
    int input_level;
    int output_level;
@@ -1226,21 +1041,13 @@ class DBImpl : public DB {
    InternalKey* manual_end;      // how far we are compacting
    InternalKey tmp_storage;      // Used to keep track of compaction progress
    InternalKey tmp_storage1;     // Used to keep track of compaction progress
-  };
-  struct PrepickedCompaction {
-    // background compaction takes ownership of `compaction`.
    Compaction* compaction;
-    // caller retains ownership of `manual_compaction_state` as it is reused
-    // across background compactions.
-    ManualCompactionState* manual_compaction_state;  // nullptr if non-manual
  };
-  std::deque<ManualCompactionState*> manual_compaction_dequeue_;
+  std::deque<ManualCompaction*> manual_compaction_dequeue_;

  struct CompactionArg {
-    // caller retains ownership of `db`.
    DBImpl* db;
-    // background compaction takes ownership of `prepicked_compaction`.
-    PrepickedCompaction* prepicked_compaction;
+    ManualCompaction* m;
  };

  // Have we encountered a background error in paranoid mode?
@@ -1254,10 +1061,6 @@ class DBImpl : public DB {
  // without any synchronization
  int disable_delete_obsolete_files_;

-  // Number of times FindObsoleteFiles has found deletable files and the
-  // corresponding call to PurgeObsoleteFiles has not yet finished.
-  int pending_purge_obsolete_files_;
-
  // last time when DeleteObsoleteFiles with full scan was executed. Originaly
  // initialized with startup time.
  uint64_t delete_obsolete_files_last_run_;
@@ -1291,9 +1094,6 @@ class DBImpl : public DB {
  // The options to access storage files
  const EnvOptions env_options_;

-  // Additonal options for compaction and flush
-  EnvOptions env_options_for_compaction_;
-
  // Number of running IngestExternalFile() calls.
  // REQUIRES: mutex held
  int num_running_ingest_file_;
@@ -1317,37 +1117,27 @@ class DBImpl : public DB {
  // Indicate DB was opened successfully
  bool opened_successfully_;

-  // REQUIRES: logs_with_prep_mutex_ held
-  //
-  // sorted list of log numbers still containing prepared data.
+  // minimum log number still containing prepared data.
  // this is used by FindObsoleteFiles to determine which
  // flushed logs we must keep around because they still
-  // contain prepared data which has not been committed or rolled back
-  struct LogCnt {
-    uint64_t log;  // the log number
-    uint64_t cnt;  // number of prepared sections in the log
-  };
-  std::vector<LogCnt> logs_with_prep_;
-  std::mutex logs_with_prep_mutex_;
+  // contain prepared data which has not been flushed or rolled back
+  std::priority_queue<uint64_t, std::vector<uint64_t>, std::greater<uint64_t>>
+      min_log_with_prep_;

-  // REQUIRES: prepared_section_completed_mutex_ held
-  //
-  // to be used in conjunction with logs_with_prep_.
+  // to be used in conjunction with min_log_with_prep_.
  // once a transaction with data in log L is committed or rolled back
-  // rather than updating logs_with_prep_ directly we keep track of that
-  // in prepared_section_completed_ which maps LOG -> instance_count. This helps
-  // avoiding contention between a commit thread and the prepare threads.
+  // rather than removing the value from the heap we add that value
+  // to prepared_section_completed_ which maps LOG -> instance_count
+  // since a log could contain multiple prepared sections
  //
  // when trying to determine the minimum log still active we first
-  // consult logs_with_prep_. while that root value maps to
-  // an equal value in prepared_section_completed_ we erase the log from
-  // both logs_with_prep_ and prepared_section_completed_.
+  // consult min_log_with_prep_. while that root value maps to
+  // a value > 0 in prepared_section_completed_ we decrement the
+  // instance_count for that log and pop the root value in
+  // min_log_with_prep_. This will work the same as a min_heap
+  // where we are deleteing arbitrary elements and the up heaping.
  std::unordered_map<uint64_t, uint64_t> prepared_section_completed_;
-  std::mutex prepared_section_completed_mutex_;
-
-  // Callback for compaction to check if a key is visible to a snapshot.
-  // REQUIRES: mutex held
-  std::unique_ptr<SnapshotChecker> snapshot_checker_;
+  std::mutex prep_heap_mutex_;

  // No copying allowed
  DBImpl(const DBImpl&);
@@ -1355,15 +1145,18 @@ class DBImpl : public DB {

  // Background threads call this function, which is just a wrapper around
  // the InstallSuperVersion() function. Background threads carry
-  // sv_context which can have new_superversion already
+  // job_context which can have new_superversion already
  // allocated.
+  void InstallSuperVersionAndScheduleWorkWrapper(
+      ColumnFamilyData* cfd, JobContext* job_context,
+      const MutableCFOptions& mutable_cf_options);
+
  // All ColumnFamily state changes go through this function. Here we analyze
  // the new state and we schedule background work if we detect that the new
  // state needs flush or compaction.
-  void InstallSuperVersionAndScheduleWork(
-      ColumnFamilyData* cfd, SuperVersionContext* sv_context,
-      const MutableCFOptions& mutable_cf_options,
-      FlushReason flush_reason = FlushReason::kOthers);
+  SuperVersion* InstallSuperVersionAndScheduleWork(
+      ColumnFamilyData* cfd, SuperVersion* new_sv,
+      const MutableCFOptions& mutable_cf_options);

 #ifndef ROCKSDB_LITE
  using DB::GetPropertiesOfAllTables;
@@ -1376,51 +1169,25 @@ class DBImpl : public DB {

 #endif  // ROCKSDB_LITE

+  // Function that Get and KeyMayExist call with no_io true or false
+  // Note: 'value_found' from KeyMayExist propagates here
+  Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
+                 const Slice& key, PinnableSlice* value,
+                 bool* value_found = nullptr);
+
  bool GetIntPropertyInternal(ColumnFamilyData* cfd,
                              const DBPropertyInfo& property_info,
                              bool is_locked, uint64_t* value);

  bool HasPendingManualCompaction();
  bool HasExclusiveManualCompaction();
-  void AddManualCompaction(ManualCompactionState* m);
-  void RemoveManualCompaction(ManualCompactionState* m);
-  bool ShouldntRunManualCompaction(ManualCompactionState* m);
+  void AddManualCompaction(ManualCompaction* m);
+  void RemoveManualCompaction(ManualCompaction* m);
+  bool ShouldntRunManualCompaction(ManualCompaction* m);
  bool HaveManualCompaction(ColumnFamilyData* cfd);
-  bool MCOverlap(ManualCompactionState* m, ManualCompactionState* m1);
+  bool MCOverlap(ManualCompaction* m, ManualCompaction* m1);

  size_t GetWalPreallocateBlockSize(uint64_t write_buffer_size) const;
-  Env::WriteLifeTimeHint CalculateWALWriteHint() {
-    return Env::WLTH_SHORT;
-  }
-
-  // When set, we use a separate queue for writes that dont write to memtable.
-  // In 2PC these are the writes at Prepare phase.
-  const bool two_write_queues_;
-  const bool manual_wal_flush_;
-  // Increase the sequence number after writing each batch, whether memtable is
-  // disabled for that or not. Otherwise the sequence number is increased after
-  // writing each key into memtable. This implies that when disable_memtable is
-  // set, the seq is not increased at all.
-  //
-  // Default: false
-  const bool seq_per_batch_;
-  // LastSequence also indicates last published sequence visibile to the
-  // readers. Otherwise LastPublishedSequence should be used.
-  const bool last_seq_same_as_publish_seq_;
-  // It indicates that a customized gc algorithm must be used for
-  // flush/compaction and if it is not provided vis SnapshotChecker, we should
-  // disable gc to be safe.
-  const bool use_custom_gc_;
-
-  // Clients must periodically call SetPreserveDeletesSequenceNumber()
-  // to advance this seqnum. Default value is 0 which means ALL deletes are
-  // preserved. Note that this has no effect if DBOptions.preserve_deletes
-  // is set to false.
-  std::atomic<SequenceNumber> preserve_deletes_seqnum_;
-  const bool preserve_deletes_;
-
-  // Flag to check whether Close() has been called on this DB
-  bool closed_;
 };

 extern Options SanitizeOptions(const std::string& db,
@@ -19,10 +19,10 @@ uint64_t DBImpl::TEST_GetLevel0TotalSize() {
  return default_cf_handle_->cfd()->current()->storage_info()->NumLevelBytes(0);
 }

-void DBImpl::TEST_SwitchWAL() {
+void DBImpl::TEST_HandleWALFull() {
  WriteContext write_context;
  InstrumentedMutexLock l(&mutex_);
-  SwitchWAL(&write_context);
+  HandleWALFull(&write_context);
 }

 int64_t DBImpl::TEST_MaxNextLevelOverlappingBytes(
@@ -60,10 +60,6 @@ uint64_t DBImpl::TEST_Current_Manifest_FileNo() {
  return versions_->manifest_file_number();
 }

-uint64_t DBImpl::TEST_Current_Next_FileNo() {
-  return versions_->current_next_file_number();
-}
-
 Status DBImpl::TEST_CompactRange(int level, const Slice* begin,
                                 const Slice* end,
                                 ColumnFamilyHandle* column_family,
@@ -84,15 +80,6 @@ Status DBImpl::TEST_CompactRange(int level, const Slice* begin,
                             disallow_trivial_move);
 }

-Status DBImpl::TEST_SwitchMemtable(ColumnFamilyData* cfd) {
-  WriteContext write_context;
-  InstrumentedMutexLock l(&mutex_);
-  if (cfd == nullptr) {
-    cfd = default_cf_handle_->cfd();
-  }
-  return SwitchMemtable(cfd, &write_context);
-}
-
 Status DBImpl::TEST_FlushMemTable(bool wait, ColumnFamilyHandle* cfh) {
  FlushOptions fo;
  fo.wait = wait;
@@ -103,7 +90,7 @@ Status DBImpl::TEST_FlushMemTable(bool wait, ColumnFamilyHandle* cfh) {
    auto cfhi = reinterpret_cast<ColumnFamilyHandleImpl*>(cfh);
    cfd = cfhi->cfd();
  }
-  return FlushMemTable(cfd, fo, FlushReason::kTest);
+  return FlushMemTable(cfd, fo);
 }

 Status DBImpl::TEST_WaitForFlushMemTable(ColumnFamilyHandle* column_family) {
@@ -117,7 +104,7 @@ Status DBImpl::TEST_WaitForFlushMemTable(ColumnFamilyHandle* column_family) {
  return WaitForFlushMemTable(cfd);
 }

-Status DBImpl::TEST_WaitForCompact(bool wait_unscheduled) {
+Status DBImpl::TEST_WaitForCompact() {
  // Wait until the compaction completes

  // TODO: a bug here. This function actually does not necessarily
@@ -125,10 +112,7 @@ Status DBImpl::TEST_WaitForCompact(bool wait_unscheduled) {
  // OR flush to finish.

  InstrumentedMutexLock l(&mutex_);
-  while ((bg_bottom_compaction_scheduled_ || bg_compaction_scheduled_ ||
-          bg_flush_scheduled_ ||
-          (wait_unscheduled && unscheduled_compactions_)) &&
-         bg_error_.ok()) {
+  while ((bg_compaction_scheduled_ || bg_flush_scheduled_) && bg_error_.ok()) {
    bg_cv_.Wait();
  }
  return bg_error_;
@@ -187,12 +171,6 @@ uint64_t DBImpl::TEST_FindMinLogContainingOutstandingPrep() {
  return FindMinLogContainingOutstandingPrep();
 }

-size_t DBImpl::TEST_PreparedSectionCompletedSize() {
-  return prepared_section_completed_.size();
-}
-
-size_t DBImpl::TEST_LogsWithPrepSize() { return logs_with_prep_.size(); }
-
 uint64_t DBImpl::TEST_FindMinPrepLogReferencedByMemTable() {
  return FindMinPrepLogReferencedByMemTable();
 }
@@ -216,13 +194,5 @@ int DBImpl::TEST_BGFlushesAllowed() const {
  return GetBGJobLimits().max_flushes;
 }

-SequenceNumber DBImpl::TEST_GetLastVisibleSequence() const {
-  if (last_seq_same_as_publish_seq_) {
-    return versions_->LastSequence();
-  } else {
-    return versions_->LastAllocatedSequence();
-  }
-}
-
 }  // namespace rocksdb
 #endif  // NDEBUG
@@ -30,10 +30,10 @@ Status DBImpl::SuggestCompactRange(ColumnFamilyHandle* column_family,
  auto cfd = cfh->cfd();
  InternalKey start_key, end_key;
  if (begin != nullptr) {
-    start_key.SetMinPossibleForUserKey(*begin);
+    start_key.SetMaxPossibleForUserKey(*begin);
  }
  if (end != nullptr) {
-    end_key.SetMaxPossibleForUserKey(*end);
+    end_key.SetMinPossibleForUserKey(*end);
  }
  {
    InstrumentedMutexLock l(&mutex_);
@@ -138,9 +138,8 @@ Status DBImpl::PromoteL0(ColumnFamilyHandle* column_family, int target_level) {
    status = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
                                    &edit, &mutex_, directories_.GetDbDir());
    if (status.ok()) {
-      InstallSuperVersionAndScheduleWork(
-          cfd, &job_context.superversion_context,
-          *cfd->GetLatestMutableCFOptions());
+      InstallSuperVersionAndScheduleWorkWrapper(
+          cfd, &job_context, *cfd->GetLatestMutableCFOptions());
    }
  }  // lock released here
  LogFlush(immutable_db_options_.info_log);
@@ -50,59 +50,54 @@ uint64_t DBImpl::FindMinPrepLogReferencedByMemTable() {

 void DBImpl::MarkLogAsHavingPrepSectionFlushed(uint64_t log) {
  assert(log != 0);
-  std::lock_guard<std::mutex> lock(prepared_section_completed_mutex_);
+  std::lock_guard<std::mutex> lock(prep_heap_mutex_);
  auto it = prepared_section_completed_.find(log);
-  if (UNLIKELY(it == prepared_section_completed_.end())) {
-    prepared_section_completed_[log] = 1;
-  } else {
-    it->second += 1;
-  }
+  assert(it != prepared_section_completed_.end());
+  it->second += 1;
 }

 void DBImpl::MarkLogAsContainingPrepSection(uint64_t log) {
  assert(log != 0);
-  std::lock_guard<std::mutex> lock(logs_with_prep_mutex_);
-
-  auto rit = logs_with_prep_.rbegin();
-  bool updated = false;
-  // Most probably the last log is the one that is being marked for
-  // having a prepare section; so search from the end.
-  for (; rit != logs_with_prep_.rend() && rit->log >= log; ++rit) {
-    if (rit->log == log) {
-      rit->cnt++;
-      updated = true;
-      break;
-    }
-  }
-  if (!updated) {
-    // We are either at the start, or at a position with rit->log < log
-    logs_with_prep_.insert(rit.base(), {log, 1});
+  std::lock_guard<std::mutex> lock(prep_heap_mutex_);
+  min_log_with_prep_.push(log);
+  auto it = prepared_section_completed_.find(log);
+  if (it == prepared_section_completed_.end()) {
+    prepared_section_completed_[log] = 0;
  }
 }

 uint64_t DBImpl::FindMinLogContainingOutstandingPrep() {
-  std::lock_guard<std::mutex> lock(logs_with_prep_mutex_);
-  auto it = logs_with_prep_.begin();
-  // start with the smallest log
-  for (; it != logs_with_prep_.end();) {
-    auto min_log = it->log;
-    {
-      std::lock_guard<std::mutex> lock2(prepared_section_completed_mutex_);
-      auto completed_it = prepared_section_completed_.find(min_log);
-      if (completed_it == prepared_section_completed_.end() ||
-          completed_it->second < it->cnt) {
-        return min_log;
-      }
-      assert(completed_it != prepared_section_completed_.end() &&
-             completed_it->second == it->cnt);
-      prepared_section_completed_.erase(completed_it);
-    }
-    // erase from beginning in vector is not efficient but this function is not
-    // on the fast path.
-    it = logs_with_prep_.erase(it);
+
+  if (!allow_2pc()) {
+    return 0;
  }
-  // no such log found
-  return 0;
+
+  std::lock_guard<std::mutex> lock(prep_heap_mutex_);
+  uint64_t min_log = 0;
+
+  // first we look in the prepared heap where we keep
+  // track of transactions that have been prepared (written to WAL)
+  // but not yet committed.
+  while (!min_log_with_prep_.empty()) {
+    min_log = min_log_with_prep_.top();
+
+    auto it = prepared_section_completed_.find(min_log);
+
+    // value was marked as 'deleted' from heap
+    if (it != prepared_section_completed_.end() && it->second > 0) {
+      it->second -= 1;
+      min_log_with_prep_.pop();
+
+      // back to squere one...
+      min_log = 0;
+      continue;
+    } else {
+      // found a valid value
+      break;
+    }
+  }
+
+  return min_log;
 }

 uint64_t DBImpl::MinLogNumberToKeep() {
@@ -113,11 +108,11 @@ uint64_t DBImpl::MinLogNumberToKeep() {
    // sections of outstanding transactions.
    //
    // We must check min logs with outstanding prep before we check
-    // logs references by memtables because a log referenced by the
+    // logs referneces by memtables because a log referenced by the
    // first data structure could transition to the second under us.
    //
    // TODO(horuff): iterating over all column families under db mutex.
-    // should find more optimal solution
+    // should find more optimial solution
    auto min_log_in_prep_heap = FindMinLogContainingOutstandingPrep();

    if (min_log_in_prep_heap != 0 && min_log_in_prep_heap < log_number) {
@@ -153,7 +148,7 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,

  bool doing_the_full_scan = false;

-  // logic for figuring out if we're doing the full scan
+  // logic for figurint out if we're doing the full scan
  if (no_full_scan) {
    doing_the_full_scan = false;
  } else if (force ||
@@ -173,7 +168,7 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,
  // threads
  // Since job_context->min_pending_output is set, until file scan finishes,
  // mutex_ cannot be released. Otherwise, we might see no min_pending_output
-  // here but later find newer generated unfinalized files while scanning.
+  // here but later find newer generated unfinalized files while scannint.
  if (!pending_outputs_.empty()) {
    job_context->min_pending_output = *pending_outputs_.begin();
  } else {
@@ -241,11 +236,11 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,
    while (alive_log_files_.begin()->number < min_log_number) {
      auto& earliest = *alive_log_files_.begin();
      if (immutable_db_options_.recycle_log_file_num >
-          log_recycle_files_.size()) {
+          log_recycle_files.size()) {
        ROCKS_LOG_INFO(immutable_db_options_.info_log,
                       "adding log %" PRIu64 " to recycle list\n",
                       earliest.number);
-        log_recycle_files_.push_back(earliest.number);
+        log_recycle_files.push_back(earliest.number);
      } else {
        job_context->log_delete_files.push_back(earliest.number);
      }
@@ -255,13 +250,7 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,
      }
      job_context->size_log_to_delete += earliest.size;
      total_log_size_ -= earliest.size;
-      if (two_write_queues_) {
-        log_write_mutex_.Lock();
-      }
      alive_log_files_.pop_front();
-      if (two_write_queues_) {
-        log_write_mutex_.Unlock();
-      }
      // Current log should always stay alive since it can't have
      // number < MinLogNumber().
      assert(alive_log_files_.size());
@@ -274,10 +263,7 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,
        continue;
      }
      logs_to_free_.push_back(log.ReleaseWriter());
-      {
-        InstrumentedMutexLock wl(&log_write_mutex_);
-        logs_.pop_front();
-      }
+      logs_.pop_front();
    }
    // Current log cannot be obsolete.
    assert(!logs_.empty());
@@ -286,11 +272,8 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,
  // We're just cleaning up for DB::Write().
  assert(job_context->logs_to_free.empty());
  job_context->logs_to_free = logs_to_free_;
-  job_context->log_recycle_files.assign(log_recycle_files_.begin(),
-                                        log_recycle_files_.end());
-  if (job_context->HaveSomethingToDelete()) {
-    ++pending_purge_obsolete_files_;
-  }
+  job_context->log_recycle_files.assign(log_recycle_files.begin(),
+                                        log_recycle_files.end());
  logs_to_free_.clear();
 }

@@ -308,10 +291,9 @@ bool CompareCandidateFile(const JobContext::CandidateFileInfo& first,
 };  // namespace

 // Delete obsolete files and log status and information of file deletion
-void DBImpl::DeleteObsoleteFileImpl(int job_id, const std::string& fname,
-                                    FileType type, uint64_t number,
-                                    uint32_t path_id) {
-  Status file_deletion_status;
+void DBImpl::DeleteObsoleteFileImpl(Status file_deletion_status, int job_id,
+                                    const std::string& fname, FileType type,
+                                    uint64_t number, uint32_t path_id) {
  if (type == kTableFile) {
    file_deletion_status =
        DeleteSSTFile(&immutable_db_options_, fname, path_id);
@@ -344,16 +326,19 @@ void DBImpl::DeleteObsoleteFileImpl(int job_id, const std::string& fname,
 }

 // Diffs the files listed in filenames and those that do not
-// belong to live files are possibly removed. Also, removes all the
+// belong to live files are posibly removed. Also, removes all the
 // files in sst_delete_files and log_delete_files.
 // It is not necessary to hold the mutex when invoking this method.
 void DBImpl::PurgeObsoleteFiles(const JobContext& state, bool schedule_only) {
-  TEST_SYNC_POINT("DBImpl::PurgeObsoleteFiles:Begin");
  // we'd better have sth to delete
  assert(state.HaveSomethingToDelete());

-  // FindObsoleteFiles() should've populated this so nonzero
-  assert(state.manifest_file_number != 0);
+  // this checks if FindObsoleteFiles() was run before. If not, don't do
+  // PurgeObsoleteFiles(). If FindObsoleteFiles() was run, we need to also
+  // run PurgeObsoleteFiles(), even if disable_delete_obsolete_files_ is true
+  if (state.manifest_file_number == 0) {
+    return;
+  }

  // Now, convert live list to an unordered map, WITHOUT mutex held;
  // set is slow.
@@ -374,9 +359,6 @@ void DBImpl::PurgeObsoleteFiles(const JobContext& state, bool schedule_only) {
    candidate_files.emplace_back(
        MakeTableFileName(kDumbDbName, file->fd.GetNumber()),
        file->fd.GetPathId());
-    if (file->table_reader_handle) {
-      table_cache_->Release(file->table_reader_handle);
-    }
    delete file;
  }

@@ -494,7 +476,8 @@ void DBImpl::PurgeObsoleteFiles(const JobContext& state, bool schedule_only) {
      InstrumentedMutexLock guard_lock(&mutex_);
      SchedulePendingPurge(fname, type, number, path_id, state.job_id);
    } else {
-      DeleteObsoleteFileImpl(state.job_id, fname, type, number, path_id);
+      DeleteObsoleteFileImpl(file_deletion_status, state.job_id, fname, type,
+                             number, path_id);
    }
  }

@@ -536,13 +519,6 @@ void DBImpl::PurgeObsoleteFiles(const JobContext& state, bool schedule_only) {
  wal_manager_.PurgeObsoleteWALFiles();
 #endif  // ROCKSDB_LITE
  LogFlush(immutable_db_options_.info_log);
-  InstrumentedMutexLock l(&mutex_);
-  --pending_purge_obsolete_files_;
-  assert(pending_purge_obsolete_files_ >= 0);
-  if (pending_purge_obsolete_files_ == 0) {
-    bg_cv_.SignalAll();
-  }
-  TEST_SYNC_POINT("DBImpl::PurgeObsoleteFiles:End");
 }

 void DBImpl::DeleteObsoleteFiles() {
@@ -16,7 +16,6 @@
 #include "db/builder.h"
 #include "options/options_helper.h"
 #include "rocksdb/wal_filter.h"
-#include "table/block_based_table_factory.h"
 #include "util/rate_limiter.h"
 #include "util/sst_file_manager_impl.h"
 #include "util/sync_point.h"
@@ -124,17 +123,6 @@ DBOptions SanitizeOptions(const std::string& dbname, const DBOptions& src) {
    result.avoid_flush_during_recovery = false;
  }

-#ifndef ROCKSDB_LITE
-  // When the DB is stopped, it's possible that there are some .trash files that
-  // were not deleted yet, when we open the DB we will find these .trash files
-  // and schedule them to be deleted (or delete immediately if SstFileManager
-  // was not used)
-  auto sfm = static_cast<SstFileManagerImpl*>(result.sst_file_manager.get());
-  for (size_t i = 0; i < result.db_paths.size(); i++) {
-    DeleteScheduler::CleanupDirectory(result.env, sfm, result.db_paths[i].path);
-  }
-#endif
-
  return result;
 }

@@ -174,19 +162,6 @@ static Status ValidateOptions(
            "universal and level compaction styles. ");
      }
    }
-    if (cfd.options.compaction_options_fifo.ttl > 0) {
-      if (db_options.max_open_files != -1) {
-        return Status::NotSupported(
-            "FIFO Compaction with TTL is only supported when files are always "
-            "kept open (set max_open_files = -1). ");
-      }
-      if (cfd.options.table_factory->Name() !=
-          BlockBasedTableFactory().Name()) {
-        return Status::NotSupported(
-            "FIFO Compaction with TTL is only supported in "
-            "Block-Based Table format. ");
-      }
-    }
  }

  if (db_options.db_paths.size() > 4) {
@@ -356,29 +331,6 @@ Status DBImpl::Recover(
      assert(s.IsIOError());
      return s;
    }
-    // Verify compatibility of env_options_ and filesystem
-    {
-      unique_ptr<RandomAccessFile> idfile;
-      EnvOptions customized_env(env_options_);
-      customized_env.use_direct_reads |=
-          immutable_db_options_.use_direct_io_for_flush_and_compaction;
-      s = env_->NewRandomAccessFile(IdentityFileName(dbname_), &idfile,
-                                    customized_env);
-      if (!s.ok()) {
-        const char* error_msg = s.ToString().c_str();
-        // Check if unsupported Direct I/O is the root cause
-        customized_env.use_direct_reads = false;
-        s = env_->NewRandomAccessFile(IdentityFileName(dbname_), &idfile,
-                                      customized_env);
-        if (s.ok()) {
-          return Status::InvalidArgument(
-              "Direct I/O is not supported by the specified DB.");
-        } else {
-          return Status::InvalidArgument(
-              "Found options incompatible with filesystem", error_msg);
-        }
-      }
-    }
  }

  Status s = versions_->Recover(column_families, read_only);
@@ -527,12 +479,11 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
  bool stop_replay_by_wal_filter = false;
  bool stop_replay_for_corruption = false;
  bool flushed = false;
-  uint64_t corrupted_log_number = kMaxSequenceNumber;
  for (auto log_number : log_numbers) {
    // The previous incarnation may not have written any MANIFEST
    // records after allocating this log number.  So we manually
    // update the file number allocation counter in VersionSet.
-    versions_->MarkFileNumberUsed(log_number);
+    versions_->MarkFileNumberUsedDuringRecovery(log_number);
    // Open the log file
    std::string fname = LogFileName(immutable_db_options_.wal_dir, log_number);

@@ -709,7 +660,7 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
      status = WriteBatchInternal::InsertInto(
          &batch, column_family_memtables_.get(), &flush_scheduler_, true,
          log_number, this, false /* concurrent_memtable_writes */,
-          next_sequence, &has_valid_writes, seq_per_batch_);
+          next_sequence, &has_valid_writes);
      MaybeIgnoreError(&status);
      if (!status.ok()) {
        // We are treating this as a failure while reading since we read valid
@@ -746,12 +697,6 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
    }

    if (!status.ok()) {
-      if (status.IsNotSupported()) {
-        // We should not treat NotSupported as corruption. It is rather a clear
-        // sign that we are processing a WAL that is produced by an incompatible
-        // version of the code.
-        return status;
-      }
      if (immutable_db_options_.wal_recovery_mode ==
          WALRecoveryMode::kSkipAnyCorruptedRecords) {
        // We should ignore all errors unconditionally
@@ -761,7 +706,6 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
        // We should ignore the error but not continue replaying
        status = Status::OK();
        stop_replay_for_corruption = true;
-        corrupted_log_number = log_number;
        ROCKS_LOG_INFO(immutable_db_options_.info_log,
                       "Point in time recovered to log #%" PRIu64
                       " seq #%" PRIu64,
@@ -779,30 +723,9 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
    auto last_sequence = *next_sequence - 1;
    if ((*next_sequence != kMaxSequenceNumber) &&
        (versions_->LastSequence() <= last_sequence)) {
-      versions_->SetLastAllocatedSequence(last_sequence);
-      versions_->SetLastPublishedSequence(last_sequence);
      versions_->SetLastSequence(last_sequence);
    }
  }
-  // Compare the corrupted log number to all columnfamily's current log number.
-  // Abort Open() if any column family's log number is greater than
-  // 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
-  if (stop_replay_for_corruption == true &&
-      (immutable_db_options_.wal_recovery_mode ==
-           WALRecoveryMode::kPointInTimeRecovery ||
-       immutable_db_options_.wal_recovery_mode ==
-           WALRecoveryMode::kTolerateCorruptedTailRecords)) {
-    for (auto cfd : *versions_->GetColumnFamilySet()) {
-      if (cfd->GetLogNumber() > corrupted_log_number) {
-        ROCKS_LOG_ERROR(immutable_db_options_.info_log,
-                        "Column family inconsistency: SST file contains data"
-                        " beyond the point of corruption.");
-        return Status::Corruption("SST file is ahead of WALs");
-      }
-    }
-  }

  // True if there's any data in the WALs; if not, we can skip re-processing
  // them later
@@ -858,7 +781,7 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
      // not actually used. that is because VersionSet assumes
      // VersionSet::next_file_number_ always to be strictly greater than any
      // log number
-      versions_->MarkFileNumberUsed(max_log_number + 1);
+      versions_->MarkFileNumberUsedDuringRecovery(max_log_number + 1);
      status = versions_->LogAndApply(
          cfd, *cfd->GetLatestMutableCFOptions(), edit, &mutex_);
      if (!status.ok()) {
@@ -871,15 +794,9 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
  if (data_seen && !flushed) {
    // Mark these as alive so they'll be considered for deletion later by
    // FindObsoleteFiles()
-    if (two_write_queues_) {
-      log_write_mutex_.Lock();
-    }
    for (auto log_number : log_numbers) {
      alive_log_files_.push_back(LogFileNumberSize(log_number));
    }
-    if (two_write_queues_) {
-      log_write_mutex_.Unlock();
-    }
  }

  event_logger_.Log() << "job" << job_id << "event"
@@ -913,34 +830,26 @@ Status DBImpl::WriteLevel0TableForRecovery(int job_id, ColumnFamilyData* cfd,
        *cfd->GetLatestMutableCFOptions();
    bool paranoid_file_checks =
        cfd->GetLatestMutableCFOptions()->paranoid_file_checks;
-
-    int64_t _current_time = 0;
-    env_->GetCurrentTime(&_current_time);  // ignore error
-    const uint64_t current_time = static_cast<uint64_t>(_current_time);
-
    {
-      auto write_hint = cfd->CalculateSSTWriteHint(0);
      mutex_.Unlock();

      SequenceNumber earliest_write_conflict_snapshot;
      std::vector<SequenceNumber> snapshot_seqs =
          snapshots_.GetAll(&earliest_write_conflict_snapshot);
-      auto snapshot_checker = snapshot_checker_.get();
-      if (use_custom_gc_ && snapshot_checker == nullptr) {
-        snapshot_checker = DisableGCSnapshotChecker::Instance();
-      }
+
+      EnvOptions optimized_env_options =
+          env_->OptimizeForCompactionTableWrite(env_options_, immutable_db_options_);
      s = BuildTable(
          dbname_, env_, *cfd->ioptions(), mutable_cf_options,
-          env_options_for_compaction_, cfd->table_cache(), iter.get(),
+          optimized_env_options, cfd->table_cache(), iter.get(),
          std::unique_ptr<InternalIterator>(mem->NewRangeTombstoneIterator(ro)),
          &meta, cfd->internal_comparator(),
          cfd->int_tbl_prop_collector_factories(), cfd->GetID(), cfd->GetName(),
-          snapshot_seqs, earliest_write_conflict_snapshot, snapshot_checker,
+          snapshot_seqs, earliest_write_conflict_snapshot,
          GetCompressionFlush(*cfd->ioptions(), mutable_cf_options),
          cfd->ioptions()->compression_opts, paranoid_file_checks,
          cfd->internal_stats(), TableFileCreationReason::kRecovery,
-          &event_logger_, job_id, Env::IO_HIGH, nullptr /* table_properties */,
-          -1 /* level */, current_time, write_hint);
+          &event_logger_, job_id);
      LogFlush(immutable_db_options_.info_log);
      ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
                      "[%s] [WriteLevel0TableForRecovery]"
@@ -993,15 +902,6 @@ Status DB::Open(const Options& options, const std::string& dbname, DB** dbptr) {
 Status DB::Open(const DBOptions& db_options, const std::string& dbname,
                const std::vector<ColumnFamilyDescriptor>& column_families,
                std::vector<ColumnFamilyHandle*>* handles, DB** dbptr) {
-  const bool seq_per_batch = true;
-  return DBImpl::Open(db_options, dbname, column_families, handles, dbptr,
-                      !seq_per_batch);
-}
-
-Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
-                    const std::vector<ColumnFamilyDescriptor>& column_families,
-                    std::vector<ColumnFamilyHandle*>* handles, DB** dbptr,
-                    const bool seq_per_batch) {
  Status s = SanitizeOptionsByTable(db_options, column_families);
  if (!s.ok()) {
    return s;
@@ -1021,7 +921,7 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
        std::max(max_write_buffer_size, cf.options.write_buffer_size);
  }

-  DBImpl* impl = new DBImpl(db_options, dbname, seq_per_batch);
+  DBImpl* impl = new DBImpl(db_options, dbname);
  s = impl->env_->CreateDirIfMissing(impl->immutable_db_options_.wal_dir);
  if (s.ok()) {
    for (auto db_path : impl->immutable_db_options_.db_paths) {
@@ -1043,7 +943,6 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
    return s;
  }
  impl->mutex_.Lock();
-  auto write_hint = impl->CalculateWALWriteHint();
  // Handles create_if_missing, error_if_exists
  s = impl->Recover(column_families);
  if (s.ok()) {
@@ -1059,20 +958,16 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
        LogFileName(impl->immutable_db_options_.wal_dir, new_log_number),
        &lfile, opt_env_options);
    if (s.ok()) {
-      lfile->SetWriteLifeTimeHint(write_hint);
      lfile->SetPreallocationBlockSize(
          impl->GetWalPreallocateBlockSize(max_write_buffer_size));
-      {
-        InstrumentedMutexLock wl(&impl->log_write_mutex_);
-        impl->logfile_number_ = new_log_number;
-        unique_ptr<WritableFileWriter> file_writer(
-            new WritableFileWriter(std::move(lfile), opt_env_options));
-        impl->logs_.emplace_back(
-            new_log_number,
-            new log::Writer(
-                std::move(file_writer), new_log_number,
-                impl->immutable_db_options_.recycle_log_file_num > 0));
-      }
+      impl->logfile_number_ = new_log_number;
+      unique_ptr<WritableFileWriter> file_writer(
+          new WritableFileWriter(std::move(lfile), opt_env_options));
+      impl->logs_.emplace_back(
+          new_log_number,
+          new log::Writer(
+              std::move(file_writer), new_log_number,
+              impl->immutable_db_options_.recycle_log_file_num > 0));

      // set column family handles
      for (auto cf : column_families) {
@@ -1102,20 +997,12 @@ Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
      }
    }
    if (s.ok()) {
-      SuperVersionContext sv_context(/* create_superversion */ true);
      for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
-        impl->InstallSuperVersionAndScheduleWork(
-            cfd, &sv_context, *cfd->GetLatestMutableCFOptions());
-      }
-      sv_context.Clean();
-      if (impl->two_write_queues_) {
-        impl->log_write_mutex_.Lock();
+        delete impl->InstallSuperVersionAndScheduleWork(
+            cfd, nullptr, *cfd->GetLatestMutableCFOptions());
      }
      impl->alive_log_files_.push_back(
          DBImpl::LogFileNumberSize(impl->logfile_number_));
-      if (impl->two_write_queues_) {
-        impl->log_write_mutex_.Unlock();
-      }
      impl->DeleteObsoleteFiles();
      s = impl->directories_.GetDbDir()->Fsync();
    }