Summary:
See github issue 574: https://github.com/facebook/rocksdb/issues/574

Basically when we're running in DEBUG mode we're calling `usleep(0)` on
every mutex lock. I bisected the issue to
https://reviews.facebook.net/D36963. Instead of calling sleep(0), this
diff just avoids calling SleepForMicroseconds() when delay is not set.

Test Plan:
    bpl=10485760;overlap=10;mcz=2;del=300000000;levels=2;ctrig=10000000; delay=10000000; stop=10000000; wbn=30; mbc=20; mb=1073741824;wbs=268435456; dds=1; sync=0; r=100000; t=1; vs=800; bs=65536; cs=1048576; of=500000; si=1000000; ./db_bench --benchmarks=fillrandom --disable_seek_compaction=1 --mmap_read=0 --statistics=1 --histogram=1 --num=$r --threads=$t --value_size=$vs --block_size=$bs --cache_size=$cs --bloom_bits=10 --cache_numshardbits=4 --open_files=$of --verify_checksum=1 --db=/tmp/rdb10test --sync=$sync --disable_wal=1 --compression_type=snappy --stats_interval=$si --compression_ratio=0.5 --disable_data_sync=$dds --write_buffer_size=$wbs --target_file_size_base=$mb --max_write_buffer_number=$wbn --max_background_compactions=$mbc --level0_file_num_compaction_trigger=$ctrig --level0_slowdown_writes_trigger=$delay --level0_stop_writes_trigger=$stop --num_levels=$levels --delete_obsolete_files_period_micros=$del --min_level_to_compress=$mcz --max_grandparent_overlap_factor=$overlap --stats_per_interval=1 --max_bytes_for_level_base=$bpl --memtablerep=vector --use_existing_db=0 --disable_auto_compactions=1 --source_compaction_factor=10000000 | grep ops

Before:
fillrandom   :     117.525 micros/op 8508 ops/sec;    6.6 MB/s
After:
fillrandom   :       1.283 micros/op 779502 ops/sec;  606.6 MB/s

Reviewers: rven, yhchiang, sdong

Reviewed By: sdong

Subscribers: meyering, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36963

Summary: Make target for running all xfunc tests

Test Plan: make xfunc

Reviewers: igor, sdong, meyering

Reviewed By: meyering

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36873

Summary:
The problem is that sometimes two memtables will be compacted together into a single file. In that case, our assertion

        ASSERT_EQ(NumTableFilesAtLevel(0), 5);

fails because same amount of data is in 4 files instead of 5. We should wait for flush so that we prevent two memtables merging into a single file.

Test Plan: `for i in `seq 20`; do mrtest FIFOCompactionTest; done` -- fails at least once before. fails zero times after.

Reviewers: rven

Reviewed By: rven

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36939

Summary:
1. it doesn't work
2. we're not using it

In the future, if we need general benchmark framework, we should probably use https://github.com/google/benchmark

Test Plan: make all

Reviewers: yhchiang, rven, anthony, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36777

Summary:
https://code.facebook.com/posts/1639473982937255/updating-our-open-source-patent-grant/

This has been done by other FB's open source projects already:
https://github.com/facebook/react/commit/b8ba8c83f318b84e42933f6928f231dc0918f864
https://github.com/facebook/osquery/blob/master/PATENTS

Test Plan: make check

Reviewers: igor, sdong

Reviewed By: sdong

Subscribers: jamesgpearce, leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D36879

Summary: oops

Test Plan: compiles now

Reviewers: sdong, yhchiang

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36867

Summary:
The goal of this diff is to make Compaction class easier to use. This should also make new compaction algorithms easier to write (like CompactFiles from @yhchiang and dynamic leveled and multi-leveled universal from @sdong).

Here are couple of things demonstrating that Compaction class is hard to use:
1. we have two constructors of Compaction class
2. there's this thing called grandparents_, but it appears to only be setup for leveled compaction and not compactfiles
3. it's easy to introduce a subtle and dangerous bug like this: D36225
4. SetupBottomMostLevel() is hard to understand and it shouldn't be. See this comment: https://github.com/facebook/rocksdb/blob/afbafeaeaebfd27a0f3e992fee8e0c57d07658fa/db/compaction.cc#L236-L241. It also made it harder for @yhchiang to write CompactFiles, as evidenced by this: https://github.com/facebook/rocksdb/blob/afbafeaeaebfd27a0f3e992fee8e0c57d07658fa/db/compaction_picker.cc#L204-L210

The problem is that we create Compaction object, which holds a lot of state, and then pass it around to some functions. After those functions are done mutating, then we call couple of functions on Compaction object, like SetupBottommostLevel() and MarkFilesBeingCompacted(). It is very hard to see what's happening with all that Compaction's state while it's travelling across different functions. If you're writing a new PickCompaction() function you need to try really hard to understand what are all the functions you need to run on Compaction object and what state you need to setup.

My proposed solution is to make important parts of Compaction immutable after construction. PickCompaction() should calculate compaction inputs and then pass them onto Compaction object once they are finalized. That makes it easy to create a new compaction -- just provide all the parameters to the constructor and you're done. No need to call confusing functions after you created your object.

This diff doesn't fully achieve that goal, but it comes pretty close. Here are some of the changes:
* have one Compaction constructor instead of two.
* inputs_ is constant after construction
* MarkFilesBeingCompacted() is now private to Compaction class and automatically called on construction/destruction.
* SetupBottommostLevel() is gone. Compaction figures it out on its own based on the input.
* CompactionPicker's functions are not passing around Compaction object anymore. They are only passing around the state that they need.

Test Plan:
make check
make asan_check
make valgrind_check

Reviewers: rven, anthony, sdong, yhchiang

Reviewed By: yhchiang

Subscribers: sdong, yhchiang, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36687

Summary: Need to remember to unref MemTableList->current() before deleting.

Test Plan: ran test with valgrind

Reviewers: igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36855

Summary: Adding verbosity to existing comments.

Test Plan: None

Reviewers: sdong

CC: leveldb

Task ID: #6718960

Blame Rev:

Summary: Thanks Ankit!

Test Plan: none

Reviewers: ankgup87

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D36837

Summary:
Test failing due to a missing directory caused by a simple bug (did not run into this on my dev box since the path already existed).

We should look into deleting test::TmpDir() before each test run.

Test Plan: ran test

Reviewers: igor, yhchiang, meyering, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36831

Summary:
Fixed xfunc related compile errors in ROCKSDB_LITE

Now make OPT=-DROCKSDB_LITE shared_lib -j32 would work

Test Plan:
make clean
make OPT=-DROCKSDB_LITE shared_lib -j32
make clean
make OPT=-DROCKSDB_LITE static_lib -j32

Reviewers: sdong, igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36825

Summary: Add tests for MemTableList

Test Plan: run test

Reviewers: yhchiang, kradhakrishnan, sdong, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36735

Summary:
Fix a compile error in ROCKSDB_LITE in db/db_impl.cc
related to internal_stats.

Test Plan: make OPT=-DROCKSDB_LITE shared_lib

Reviewers: sdong, igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36819

Summary: "make commit-prereq" uses "make release" which overrides OPT, so ROCKSDB_LITE is not covered. Fix it by using "make static_lib"

Test Plan: Run it and see it fail (which is expected)

Reviewers: yhchiang, meyering, rven, anthony, kradhakrishnan, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D36813

Summary:
Fix a compilation error in ROCKSDB_LITE in db/internal_stats.h

Other compilation errors will be fixed in a separate diff.

Test Plan: make OPT=-DROCKSDB_LITE

Reviewers: sdong, igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36807

Summary:
Add a test case:
Write some keys without sync, flush, write other keys and do sync. Before flush finishes, host crashes and unsync data is dropped.
Tag the new test as disabled since it is not passing.

Test Plan: Run the test

Reviewers: MarkCallaghan, rven, anthony, igor, kradhakrishnan

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D36741

Summary:
This fixes two problems:
1) the env should not be created twice when use_existing_db is false
2) the env dtor should run before cachedev_fd_ is closed.

Task ID: #

Blame Rev:

Test Plan:
Revert Plan:

Database Impact:

Memcache Impact:

Other Notes:

EImportant:

- begin *PUBLIC* platform impact section -
Bugzilla: #
- end platform impact -

Reviewers: igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D36795

Summary: I don't think we need to use whole-archive to include jemalloc. This change only affects our development builds -- it does not affect our open source builds (which don't support jemalloc) or our fbcode third-party2 builds (which use open-source build codepaths).

Test Plan:
make
verify that jemalloc is running by running `MALLOC_CONF="prof:true" ./cache_test` and observing that file was created

Reviewers: MarkCallaghan

Reviewed By: MarkCallaghan

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36783

Summary: Other than making some class members private, this is a documentation-only change

Test Plan: unit tests

Reviewers: sdong, yhchiang, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36567

Summary: Add a script, which checks out changes from a list of tags, build them and load the same data into it. In the last, checkout the target build and make sure it can successfully open DB and read all the data. It is implemented through ldb tool, because ldb tool is available from all previous builds so that we don't have to cross build anything.

Test Plan: Run the script.

Reviewers: yhchiang, rven, anthony, kradhakrishnan, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D36639

Summary: I think the checksum was turned off by mistake.

Test Plan: Run make check

Reviewers: igor sdong chip

CC:

Task ID:

Blame Rev:

Summary: Now EnvOptions uses unsanitized DB options. bytes_per_sync is tuned off when rate_limiter is used, but this change doesn't take effort.

Test Plan: See different I/O pattern in db_bench running fillseq.

Reviewers: yhchiang, kradhakrishnan, rven, anthony, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D36723

Summary: These two files are test binaries and are not included in TESTS in Makefile.

Test Plan: `make clean` now deletes those files, too

Reviewers: sdong, kradhakrishnan, meyering

Reviewed By: kradhakrishnan, meyering

Subscribers: kradhakrishnan, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36705

Summary:
When building rocksdbjava and rocksdbjavastatic, create -fPIC-enabled
binaries in a temporary subdirectory, jl/.
* Makefile (java_libobjects): New variable.
(java_libobjects): New rule.
(CLEAN_FILES): Arrange for "make clean" to remove that temporary dir.
(rocksdbjavastatic): Depend on the new variable.
Remove useless OPT=... line.
(rocksdbjava): Likewise.

Test Plan:
  JAVA_HOME=/usr/local/jdk-7u67-64 PATH=$JAVA_HOME/bin:$PATH \
    make rocksdbjavastatic

Reviewers: yhchiang

Reviewed By: yhchiang

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D36645

Summary: Now trivial move is only triggered when moving from level n to n+1. With dynamic level base, it is possible that file is moved from level 0 to level n, while levels from 1 to n-1 are empty. Extend trivial move to this case.

Test Plan: Add a more unit test of sequential loading. Non-trivial compaction happened without the patch and now doesn't happen.

Reviewers: rven, yhchiang, MarkCallaghan, igor

Reviewed By: igor

Subscribers: leveldb, dhruba, IslamAbdelRahman

Differential Revision: https://reviews.facebook.net/D36669

Summary: See the file.

Test Plan: none

Reviewers: lgalanis, meyering, MarkCallaghan, yhchiang, rven, anthony, kradhakrishnan, jayadev, sdong

Reviewed By: jayadev

Subscribers: jayadev, rdallman, andybons, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36621

Summary: Added a ASCII doodle to represent the log writer format.

Test Plan: None

Reviewers: sdong

CC: leveldb

Task ID: 6179896

Blame Rev:

Summary:
Fix the following compilation error in flashcache.cc on Mac

Undefined symbols for architecture x86_64:

"rocksdb::NewFlashcacheAwareEnv(rocksdb::Env*, int)", referenced from:
    rocksdb::Benchmark::Open(rocksdb::Options*) in db_bench.o

Test Plan: make db_bench

Reviewers: sdong, igor, rven

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36657

Summary:
* src.mk (JNI_NATIVE_SOURCES): New variable, so we don't have to use
a glob in Makefile
* Makefile (JNI_NATIVE_SOURCES): Remove glob-using definition, now
that the explicit list of sources is in src.mk.

Test Plan:
  Run this:
    JAVA_HOME=/usr/local/jdk-7u67-64 PATH=$JAVA_HOME/bin:$PATH \
      make rocksdbjava

Reviewers: yhchiang

Reviewed By: yhchiang

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D36633

Summary:
As described in https://github.com/facebook/rocksdb/issues/563, we should add minor version to SONAME, since we break ABI with minor releases.

I also turned PLATFORM_SHARED_VERSIONED to true by default. This is true in LevelDB and it was switched to false by D15117 for no apparent reason. It should only be false for iOS.

Test Plan: `make shared_lib` produced librocksdb.dylib.3.10.0

Reviewers: sdong, yhchiang, meyering

Reviewed By: meyering

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36573

Summary:
After this diff, when a user submits a diff from Facebook's VPN
network, we'll automatically trigger a jenkins test. Once jenkins test
is done, we'll update the diff with test results.

Test Plan:
Made sure that jenkins build is triggered on `arc diff` and
that result is reflected back on the diff

Reviewers: sdong, rven, kradhakrishnan, anthony, yhchiang

Reviewed By: anthony

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D36555

Summary:
D36447 caused build error when using COMPILE_WITH_TSAN=1.
This diff fixes the error.

Test Plan: jenkins

Reviewers: igor, sdong

Reviewed By: sdong

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D36579

Summary:
There are some cases when flachcache file descriptor was
already allocated (i.e. fb-MySQL). Then NewFlashcacheAwareEnv returns an
error at open() because fd was already assigned. This diff adds another
function to instantiate FlashcacheAwareEnv, with pre-allocated fd cachedev_fd.

Test Plan: Tested with MyRocks using this function, then worked

Reviewers: sdong, igor

Reviewed By: igor

Subscribers: dhruba, MarkCallaghan, rven

Differential Revision: https://reviews.facebook.net/D36447

Summary: Now we add warnings when user configures compression and the compression is not supported.

Test Plan:
Configured compression to non-supported values. Observed messages in my log:

    2015/03/26-12:17:57.586341 7ffb8a496840 [WARN] Compression type chosen for level 2 is not supported: LZ4. RocksDB will not compress data on level 2.

    2015/03/26-12:19:10.768045 7f36f15c5840 [WARN] Compression type chosen is not supported: LZ4. RocksDB will not compress data.

Reviewers: rven, sdong, yhchiang

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D35979

Summary:
When GNU parallel is available, "make check" tests are now run in parallel.
When /dev/shm is usable, we tell those tests to create temporary files therein.
Now, the longest-running single test, db_test, (which is composed of hundreds of sub-tests)
is no longer run sequentially: instead, each of its sub-tests is run independently, and can
be parallelized along with all other tests. To make that process easier, this change
creates a temporary directory, "t/", in which it puts a small script for each of those
subtests. The output from each parallel-run test is now saved in t/log-TEST_NAME.

When GNU parallel is not available, we run the tests in sequence, just as before.
If GNU parallel is available and you don't like the default of running one subtest
per core, you can invoke "make J=1 check" to run only one test at a time.
Beware: this will take a long time, and it starts with the two longest-running tests, so you
will wait for a long time before seeing any results. Instead, if you want to use fewer resources
but still see useful progress, try "make J=60% check". That will attempt to ensure that 60% of
the cores are occupied by test runs.

To watch progress of individual tests (duration, success (PASS-or-FAIL), name), run "make watch-log"
in the same directory from another window.  That will start with something like this:

and when complete should show numbers/names like this:

  Every 0.1s: sort -k7,7nr -k4,4gr LOG|perl -n -e '@a=split("\t",$_,-1); $t=$a[8]; $t =~ s,^\./,,;' -e '$t =~ s, >.*,,; chomp $t;' -e '$t =~ /.*--gtest_filter=...  Wed Apr  1 10:51:42 2015

  152.221 PASS t/DBTest.FileCreationRandomFailure
  109.280 PASS t/DBTest.EncodeDecompressedBlockSizeTest
   82.315 PASS reduce_levels_test
   77.812 PASS t/DBTest.CompactionFilterWithValueChange
   73.236 PASS backupable_db_test
   63.428 PASS deletefile_test
   57.248 PASS table_test
   55.665 PASS prefix_test
   49.816 PASS t/DBTest.RateLimitingTest
  ...

Test Plan:
Timings (measured so as to exclude compile and link times):
With this change, all tests complete in 2m40s on a system for which nproc prints 32.
Prior to this this change, "make check" would take 24.5 minutes on that same system.

Here are durations (in seconds) of the longest-running subtests:

152.435 PASS t/DBTest.FileCreationRandomFailure
107.070 PASS t/DBTest.EncodeDecompressedBlockSizeTest
 81.391 PASS ./reduce_levels_test
 71.587 PASS ./backupable_db_test
 61.746 PASS ./deletefile_test
 57.960 PASS ./table_test
 55.230 PASS ./prefix_test
 54.060 PASS t/DBTest.CompactionFilterWithValueChange
 48.873 PASS t/DBTest.RateLimitingTest
 47.569 PASS ./fault_injection_test
 46.593 PASS t/DBTest.Randomized
 42.662 PASS t/DBTest.CompactionFilter
 31.793 PASS t/DBTest.SparseMerge
 30.612 PASS t/DBTest.CompactionFilterV2
 25.891 PASS t/DBTest.GroupCommitTest
 23.863 PASS t/DBTest.DynamicLevelMaxBytesBase
 22.976 PASS ./rate_limiter_test
 18.942 PASS t/DBTest.OptimizeFiltersForHits
 16.851 PASS ./env_test
 15.399 PASS t/DBTest.CompactionFilterV2WithValueChange
 14.827 PASS t/DBTest.CompactionFilterV2NULLPrefix

Reviewers: igor, sdong, rven, yhchiang, igor.sugak

Reviewed By: igor.sugak

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D35379

Summary:
Fix build break on travis build:

$ OPT=-DTRAVIS V=1 make unity && make clean && OPT=-DTRAVIS V=1 make db_test && ./db_test

......

In file included from unity.cc:65:0:
./table/plain_table_key_coding.cc: In member function ‘rocksdb::Status rocksdb::PlainTableKeyDecoder::NextPrefixEncodingKey(const char*, const char*, rocksdb::ParsedInternalKey*, rocksdb::Slice*, size_t*, bool*)’:
./table/plain_table_key_coding.cc:224:3: error: reference to ‘EntryType’ is ambiguous
   EntryType entry_type;
   ^
In file included from ./db/table_properties_collector.h:9:0,
                 from ./db/builder.h:11,
                 from ./db/builder.cc:10,
                 from unity.cc:1:
./include/rocksdb/table_properties.h:81:6: note: candidates are: enum rocksdb::EntryType
 enum EntryType {
      ^
In file included from unity.cc:65:0:
./table/plain_table_key_coding.cc:16:6: note:                 enum rocksdb::{anonymous}::EntryType
 enum EntryType : unsigned char {
      ^
./table/plain_table_key_coding.cc:231:51: error: ‘entry_type’ was not declared in this scope
     const char* pos = DecodeSize(key_ptr, limit, &entry_type, &size);
                                                   ^
make: *** [unity.o] Error 1

Test Plan:
OPT=-DTRAVIS V=1 make unity

And make sure it doesn't break anymore.

Reviewers: yhchiang, kradhakrishnan, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D36549

Summary:
This adds p99.9 and p99.99 response times to the benchmark report and
adds a second report, report2.txt that has tests listed in test order rather
than the time in which they were run, so overwrite tests are listed for
all thread counts, then update etc.

Also changes fillseq to compress all levels to avoid write-amp from rewriting
uncompressed files when they reach the first level to compress.

Increase max_write_buffer_number to avoid stalls during fillseq and make
max_background_flushes agree with max_write_buffer_number.

See https://gist.github.com/mdcallag/297ff4316a25cb2988f7 for an example
of the new report (report2.txt)

Task ID: #

Blame Rev:

Test Plan:
Revert Plan:

Database Impact:

Memcache Impact:

Other Notes:

EImportant:

- begin *PUBLIC* platform impact section -
Bugzilla: #
- end platform impact -

Reviewers: igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D36537

Summary:
Currently users have no idea a key is add, delete or merge from TablePropertiesCollector call back. Add a new function to add it.

Also refactor the codes so that
(1) make table property collector and internal table property collector two separate data structures with the later one now exposed
(2) table builders only receive internal table properties

Test Plan: Add cases in table_properties_collector_test to cover both of old and new ways of using TablePropertiesCollector.

Reviewers: yhchiang, igor.sugak, rven, igor

Reviewed By: rven, igor

Subscribers: meyering, yoshinorim, maykov, leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D35373