Summary:
We found a case of cacheline bouncing due to writers locking/unlocking `mutex_` and readers accessing `block_cache_tracer_`. We discovered it only after the issue was fixed by https://github.com/facebook/rocksdb/issues/9462 shifting the `DBImpl` members such that `mutex_` and `block_cache_tracer_` were naturally placed in separate cachelines in our regression testing setup. This PR forces the cacheline alignment of `mutex_` so we don't accidentally reintroduce the problem.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9637
Reviewed By: riversand963
Differential Revision: D34502233
Pulled By: ajkr
fbshipit-source-id: 46aa313b7fe83e80c3de254e332b6fb242434c07
Summary:
Change enum SizeApproximationFlags to enum and class and add
overloaded operators for the transition between enum class and uint8_t
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9604
Test Plan: Circle CI jobs
Reviewed By: riversand963
Differential Revision: D34360281
Pulled By: akankshamahajan15
fbshipit-source-id: 6351dfdb717ae3c4530d324c3d37a8ecb01dd1ef
Summary:
Add Temperature hints information from RocksDB in API
`NewSequentialFile()`. backup and checkpoint operations need to open the
source files with `NewSequentialFile()`, which will have the temperature
hints. Other operations are not covered.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9499
Test Plan: Added unittest
Reviewed By: pdillinger
Differential Revision: D34006115
Pulled By: jay-zhuang
fbshipit-source-id: 568b34602b76520e53128672bd07e9d886786a2f
Summary:
This PR adds support for new APIs Async Read that reads the data
asynchronously and Poll API that checks if requested read request has
completed or not.
Usage: In RocksDB, we are currently planning to prefetch data
asynchronously during sequential scanning and RocksDB will call these
APIs to prefetch more data in advanced.
Design:
- ReadAsync API submits the read request to underlying FileSystem in
order to read data asynchronously. When read request is completed,
callback function will be called. cb_arg is used by RocksDB to track the
original request submitted and IOHandle is used by FileSystem to keep track
of IO requests at their level.
- The Poll API is added in FileSystem because the call could end up handling
completions for multiple different files which is not specific to a
FSRandomAccessFile instance. There could be multiple outstanding file reads
from different files in future and they can complete in any order.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9564
Test Plan: Test will be added in separate PR.
Reviewed By: anand1976
Differential Revision: D34226216
Pulled By: akankshamahajan15
fbshipit-source-id: 95e64edafb17f543f7232421d51e2665a3267f69
Summary:
[Compaction::IsTrivialMove](a2b9be42b6/db/compaction/compaction.cc (L318)) checks whether allow_trivial_move is set, and if so it returns the value of is_trivial_move_. The allow_trivial_move option is there for universal compaction. So when this is set and leveled compaction is enabled, then useful code that follows this block never gets a chance to run.
A check that [compaction_style == kCompactionStyleUniversal](320d9a8e8a/db/db_impl/db_impl_compaction_flush.cc (L1030)) should be added to avoid doing the wrong thing for leveled.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9586
Test Plan:
To reproduce this:
First edit db/compaction/compaction.cc with
```
diff --git a/db/compaction/compaction.cc b/db/compaction/compaction.cc
index 7ae50b91e..52dd489b1 100644
--- a/db/compaction/compaction.cc
+++ b/db/compaction/compaction.cc
@@ -319,6 +319,8 @@ bool Compaction::IsTrivialMove() const {
// input files are non overlapping
if ((mutable_cf_options_.compaction_options_universal.allow_trivial_move) &&
(output_level_ != 0)) {
+ printf("IsTrivialMove:: return %d because universal allow_trivial_move\n", (int) is_trivial_move_);
+ // abort();
return is_trivial_move_;
}
```
And then run
```
./db_bench --benchmarks=fillseq --allow_concurrent_memtable_write=false --level0_file_num_compaction_trigger=4 --level0_slowdown_writes_trigger=20 --level0_stop_writes_trigger=30 --max_background_jobs=8 --max_write_buffer_number=8 --db=/data/m/rx --wal_dir=/data/m/rx --num=800000000 --num_levels=8 --key_size=20 --value_size=400 --block_size=8192 --cache_size=51539607552 --cache_numshardbits=6 --compression_max_dict_bytes=0 --compression_ratio=0.5 --compression_type=lz4 --bytes_per_sync=8388608 --cache_index_and_filter_blocks=1 --cache_high_pri_pool_ratio=0.5 --benchmark_write_rate_limit=0 --write_buffer_size=16777216 --target_file_size_base=16777216 --max_bytes_for_level_base=67108864 --verify_checksum=1 --delete_obsolete_files_period_micros=62914560 --max_bytes_for_level_multiplier=8 --statistics=0 --stats_per_interval=1 --stats_interval_seconds=20 --histogram=1 --memtablerep=skip_list --bloom_bits=10 --open_files=-1 --subcompactions=1 --compaction_style=0 --min_level_to_compress=3 --level_compaction_dynamic_level_bytes=true --pin_l0_filter_and_index_blocks_in_cache=1 --soft_pending_compaction_bytes_limit=167503724544 --hard_pending_compaction_bytes_limit=335007449088 --min_level_to_compress=0 --use_existing_db=0 --sync=0 --threads=1 --memtablerep=vector --allow_concurrent_memtable_write=false --disable_wal=1 --seed=1641328309 --universal_allow_trivial_move=1
```
Example output with the debug code added
```
IsTrivialMove:: return 0 because universal allow_trivial_move
IsTrivialMove:: return 0 because universal allow_trivial_move
```
After this PR, the bug is fixed.
Reviewed By: ajkr
Differential Revision: D34350451
Pulled By: gitbw95
fbshipit-source-id: 3232005cc47c40a7e75d316cfc7960beb5bdff3a
Summary:
Make FilterPolicy into a Customizable class. Allow new FilterPolicy to be discovered through the ObjectRegistry
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9590
Reviewed By: pdillinger
Differential Revision: D34327367
Pulled By: mrambacher
fbshipit-source-id: 37e7edac90ec9457422b72f359ab8ef48829c190
Summary:
RocksDB try to provide temperature information in the event
listener callbacks. The information is not guaranteed, as some operation
like backup won't have these information.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9591
Test Plan: Added unittest
Reviewed By: siying, pdillinger
Differential Revision: D34309339
Pulled By: jay-zhuang
fbshipit-source-id: 4aca4f270f99fa49186d85d300da42594663d6d7
Summary:
`ColumnFamilyOptions::OldDefaults` and `DBOptions::OldDefaults`
now deprecated. Were previously overlooked with `Options::OldDefaults` in https://github.com/facebook/rocksdb/issues/9363
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9594
Test Plan: comments only
Reviewed By: jay-zhuang
Differential Revision: D34318592
Pulled By: pdillinger
fbshipit-source-id: 773c97a61e2a8290ae154f363dd61c1f35a9dd16
Summary:
Extend the plugin architecture to allow for the inclusion, building and testing of Java and JNI components of a plugin. This will cause the JAR built by `$ make rocksdbjava` to include the extra functionality provided by the plugin, and will cause `$ make jtest` to add the java tests provided by the plugin to the tests built and run by Java testing.
The plugin's `<plugin>.mk` file can define:
```
<plugin>_JNI_NATIVE_SOURCES
<plugin>_NATIVE_JAVA_CLASSES
<plugin>_JAVA_TESTS
```
The plugin should provide java/src, java/test and java/rocksjni directories. When a plugin is required to be build it must be named in the ROCKSDB_PLUGINS environment variable (as per the plugin architecture). This now has the effect of adding the files specified by the above definitions to the appropriate parts of the build.
An example of a plugin with a Java component can be found as part of the hdfs plugin in https://github.com/riversand963/rocksdb-hdfs-env - at the time of writing the Java part of this fails tests, and needs a little work to complete, but it builds correctly under the plugin model.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9575
Reviewed By: hx235
Differential Revision: D34253948
Pulled By: riversand963
fbshipit-source-id: b3dde5da06f3d3c25c54246892097ae2a369b42d
Summary:
For RocksDB v7 major release. Remove previously deprecated Java API methods and associated tests
- where equivalent/alternative functionality exists and is already tested AND
- where the core RocksDB function/feature has also been removed
- OR the functionality exists only in Java so the previous deprecation only affected Java methods
RETAIN deprecated Java which reflects functionality which is deprecated by, but also still supported by, the core of RocksDB.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9576
Reviewed By: ajkr
Differential Revision: D34314983
Pulled By: jay-zhuang
fbshipit-source-id: 7cf9c17e3e07be9d289beb99f81b71e8e09ac403
Summary:
We don't have any evidence of people using these to build custom
filters. The recommended way of customizing filter handling is to
defer to various built-in policies based on FilterBuildingContext
(e.g. to build Monkey filtering policy). With old API, we have
evidence of people modifying keys going into filter, but most cases
of that can be handled with prefix_extractor.
Having FilterBitsBuilder+Reader in the public API is an ogoing
hinderance to code evolution (e.g. recent new Finish and
MaybePostVerify), and so this change removes them from the public API
for 7.0. Maybe they will come back in some form later, but lacking
evidence of them providing value in the public API, we want to take back
more freedom to evolve these.
With this moved to internal-only, there is no rush to clean up the
complex Finish signatures, or add memory allocator support, but doing so
is much easier with them out of public API, for example to use
CacheAllocationPtr without exposing it in the public API.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9592
Test Plan: cosmetic changes only
Reviewed By: hx235
Differential Revision: D34315470
Pulled By: pdillinger
fbshipit-source-id: 03e03bb66a72c73df2c464d2dbbbae906dd8f99b
Summary:
The NUM_INDEX_AND_FILTER_BLOCKS_READ_PER_LEVEL, NUM_DATA_BLOCKS_READ_PER_LEVEL, and NUM_SST_READ_PER_LEVEL stats were being recorded only when the last file in a level happened to have hits. They are supposed to be updated for every level. Also, there was some overcounting of GetContextStats. This PR fixes both the problems.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9583
Test Plan: Update the unit test in db_basic_test
Reviewed By: akankshamahajan15
Differential Revision: D34308044
Pulled By: anand1976
fbshipit-source-id: b3b36020fda26ba91bc6e0e47d52d58f4d7f656e
Summary:
When WAL compression is enabled, add a record (new record type) to store the compression type to indicate that all subsequent records are compressed. The log reader will store the compression type when this record is encountered and use the type to uncompress the subsequent records. Compress and uncompress to be implemented in subsequent diffs.
Enabled WAL compression in some WAL tests to check for regressions. Some tests that rely on offsets have been disabled.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9556
Reviewed By: anand1976
Differential Revision: D34308216
Pulled By: sidroyc
fbshipit-source-id: 7f10595e46f3277f1ea2d309fbf95e2e935a8705
Summary:
For RocksJava 7 we will move from requiring Java 7 to Java 8.
* This simplifies the `Makefile` as we no longer need to deal with Java 7; so we no longer use `javah`.
* Added a java-version target which is invoked by the java target, and which exits if the version of java being used is not 8 or greater.
* Enforces java 8 as a minimum.
* Fixed CMake build.
* Fixed broken java event listener test, as the test was broken and the assertions in the callbacks were not causing assertions in the tests. The callbacks now queue up assertion errors for the main thread of the tests to check.
* Fixed C++ dangling pointers in the test code.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9541
Reviewed By: pdillinger
Differential Revision: D34214929
Pulled By: jay-zhuang
fbshipit-source-id: fdff348758d0a23a742e83c87d5f54073ce16ca6
Summary:
Users can set the priority for file reads associated with their operation by setting `ReadOptions::rate_limiter_priority` to something other than `Env::IO_TOTAL`. Rate limiting `VerifyChecksum()` and `VerifyFileChecksums()` is the motivation for this PR, so it also includes benchmarks and minor bug fixes to get that working.
`RandomAccessFileReader::Read()` already had support for rate limiting compaction reads. I changed that rate limiting to be non-specific to compaction, but rather performed according to the passed in `Env::IOPriority`. Now the compaction read rate limiting is supported by setting `rate_limiter_priority = Env::IO_LOW` on its `ReadOptions`.
There is no default value for the new `Env::IOPriority` parameter to `RandomAccessFileReader::Read()`. That means this PR goes through all callers (in some cases multiple layers up the call stack) to find a `ReadOptions` to provide the priority. There are TODOs for cases I believe it would be good to let user control the priority some day (e.g., file footer reads), and no TODO in cases I believe it doesn't matter (e.g., trace file reads).
The API doc only lists the missing cases where a file read associated with a provided `ReadOptions` cannot be rate limited. For cases like file ingestion checksum calculation, there is no API to provide `ReadOptions` or `Env::IOPriority`, so I didn't count that as missing.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9424
Test Plan:
- new unit tests
- new benchmarks on ~50MB database with 1MB/s read rate limit and 100ms refill interval; verified with strace reads are chunked (at 0.1MB per chunk) and spaced roughly 100ms apart.
- setup command: `./db_bench -benchmarks=fillrandom,compact -db=/tmp/testdb -target_file_size_base=1048576 -disable_auto_compactions=true -file_checksum=true`
- benchmarks command: `strace -ttfe pread64 ./db_bench -benchmarks=verifychecksum,verifyfilechecksums -use_existing_db=true -db=/tmp/testdb -rate_limiter_bytes_per_sec=1048576 -rate_limit_bg_reads=1 -rate_limit_user_ops=true -file_checksum=true`
- crash test using IO_USER priority on non-validation reads with https://github.com/facebook/rocksdb/issues/9567 reverted: `python3 tools/db_crashtest.py blackbox --max_key=1000000 --write_buffer_size=524288 --target_file_size_base=524288 --level_compaction_dynamic_level_bytes=true --duration=3600 --rate_limit_bg_reads=true --rate_limit_user_ops=true --rate_limiter_bytes_per_sec=10485760 --interval=10`
Reviewed By: hx235
Differential Revision: D33747386
Pulled By: ajkr
fbshipit-source-id: a2d985e97912fba8c54763798e04f006ccc56e0c
Summary:
The following sequence of events can cause silent data loss for write-committed
transactions.
```
Time thread 1 bg flush
| db->Put("a")
| txn = NewTxn()
| txn->Put("b", "v")
| txn->Prepare() // writes only to 5.log
| db->SwitchMemtable() // memtable 1 has "a"
| // close 5.log,
| // creates 8.log
| trigger flush
| pick memtable 1
| unlock db mutex
| write new sst
| txn->ctwb->Put("gtid", "1") // writes 8.log
| txn->Commit() // writes to 8.log
| // writes to memtable 2
| compute min_log_number_to_keep_2pc, this
| will be 8 (incorrect).
|
| Purge obsolete wals, including 5.log
|
V
```
At this point, writes of txn exists only in memtable. Close db without flush because db thinks the data in
memtable are backed by log. Then reopen, the writes are lost except key-value pair {"gtid"->"1"},
only the commit marker of txn is in 8.log
The reason lies in `PrecomputeMinLogNumberToKeep2PC()` which calls `FindMinPrepLogReferencedByMemTable()`.
In the above example, when bg flush thread tries to find obsolete wals, it uses the information
computed by `PrecomputeMinLogNumberToKeep2PC()`. The return value of `PrecomputeMinLogNumberToKeep2PC()`
depends on three components
- `PrecomputeMinLogNumberToKeepNon2PC()`. This represents the WAL that has unflushed data. As the name of this method suggests, it does not account for 2PC. Although the keys reside in the prepare section of a previous WAL, the column family references the current WAL when they are actually inserted into the memtable during txn commit.
- `prep_tracker->FindMinLogContainingOutstandingPrep()`. This represents the WAL with a prepare section but the txn hasn't committed.
- `FindMinPrepLogReferencedByMemTable()`. This represents the WAL on which some memtables (mutable and immutable) depend for their unflushed data.
The bug lies in `FindMinPrepLogReferencedByMemTable()`. Originally, this function skips checking the column families
that are being flushed, but the unit test added in this PR shows that they should not be. In this unit test, there is
only the default column family, and one of its memtables has unflushed data backed by a prepare section in 5.log.
We should return this information via `FindMinPrepLogReferencedByMemTable()`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9571
Test Plan:
```
./transaction_test --gtest_filter=*/TransactionTest.SwitchMemtableDuringPrepareAndCommit_WC/*
make check
```
Reviewed By: siying
Differential Revision: D34235236
Pulled By: riversand963
fbshipit-source-id: 120eb21a666728a38dda77b96276c6af72b008b1
Summary:
As in
```
db_stress: table/block_based/filter_policy.cc:316: rocksdb::{anonymous}::FastLocalBloomBitsBuilder::FastLocalBloomBitsBuilder(int, std::atomic<long int>*, std::shared_ptr<rocksdb::CacheReservationManager>, bool): Assertion `millibits_per_key >= 1000' failed.
```
This assertion failure was actually happening with our RibbonFilterPolicy
which falls back to Bloom for some cases, often for flush, but was
missing new special logic to skip generating filter for 0 bits per key
case. Fixed by adding the logic in other builtin FilterPolicy
implementations.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9585
Test Plan:
Updated db_bloom_filter_test to do more integration testing
of the RibbonFilterPolicy ("auto Ribbon") class, incl regression test
this with SkipFilterOnEssentiallyZeroBpk
Reviewed By: ajkr
Differential Revision: D34295101
Pulled By: pdillinger
fbshipit-source-id: 3488eb207fc1d67bbbd1301313714aa1b6406e6e
Summary:
Opening DB as seconeary instance has been supported in ldb but it is not mentioned in --help. Mention it there. The part of the help message after the modification:
```
commands MUST specify --db=<full_path_to_db_directory> when necessary
commands can optionally specify
--env_uri=<uri_of_environment> or --fs_uri=<uri_of_filesystem> if necessary
--secondary_path=<secondary_path> to open DB as secondary instance. Operations not supported in secondary instance will fail.
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9582
Test Plan: Build and run ldb --help
Reviewed By: riversand963
Differential Revision: D34286427
fbshipit-source-id: e56c5290d0548098ab6acc6dde2167f5a64f34f3
Summary:
Remove deprecated remote compaction APIs
`CompactionService::Start()` and `CompactionService::WaitForComplete()`.
Please use `CompactionService::StartV2()`,
`CompactionService::WaitForCompleteV2()` instead, which provides the
same information plus extra data like priority, db_id, etc.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9570
Test Plan: CI
Reviewed By: riversand963
Differential Revision: D34255969
Pulled By: jay-zhuang
fbshipit-source-id: c6376eccdd1123f1c42ab53771b5f65f8160c325
Summary:
Add support for doubles to ObjectLibrary::PatternEntry. This support will allow patterns containing a non-integer number to be parsed correctly.
Added appropriate test cases to cover this new option.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9577
Reviewed By: pdillinger
Differential Revision: D34269763
Pulled By: mrambacher
fbshipit-source-id: b5ce16cbd3665c2974ec0f3412ef2b403ef8b155
Summary:
Add Solana's RocksDB use case in USERS.md.
Solana is a fast, secure, scalable, and decentralized blockchain. It uses RocksDB as the underlying storage for its ledger store.
github: https://github.com/solana-labs/solana
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9558
Reviewed By: jay-zhuang
Differential Revision: D34249087
Pulled By: riversand963
fbshipit-source-id: 7524eff4952e2676e8520ac491ffb6a686fb4d7e
Summary:
Some changes to make it easier to make FilterPolicy
customizable. Especially, create distinct classes for the different
testing-only and user-facing built-in FilterPolicy modes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9567
Test Plan:
tests updated, with no intended difference in functionality
tested. No difference in test performance seen as a result of moving to
string-based filter type configuration.
Reviewed By: mrambacher
Differential Revision: D34234694
Pulled By: pdillinger
fbshipit-source-id: 8a94931a9e04c3bcca863a4f524cfd064aaf0122
Summary:
Fix `DisableManualCompaction()` has to wait scheduled manual compaction to start the execution to cancel the job.
When a manual compaction in thread-pool queue is cancel, set the job is_canceled to true and clean the resource.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9557
Test Plan: added unittest that will hang without the change
Reviewed By: ajkr
Differential Revision: D34214910
Pulled By: jay-zhuang
fbshipit-source-id: 89dbaee78ddf26eb13ce862c2b15f4a098b36a78
Summary:
I did another pass through running CI jobs. It is uncommon now to see
`db_stress` stuck in the setup phase but still happen.
One reason was repeatedly reading/verifying checksum on filter blocks when
`-cache_index_and_filter_blocks=1` and `-cache_size=1048576`. To address
that I increased the cache size.
Another reason was having a WAL with many range tombstones and every
`db_stress` run using `-avoid_flush_during_recovery=1` (in that
scenario, the setup phase spent too much CPU in
`rocksdb::MemTable::NewRangeTombstoneIteratorInternal()`). To address
that I fixed the `-avoid_flush_during_recovery` setting so it is
reevaluated for every `db_stress` run.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9483
Reviewed By: riversand963
Differential Revision: D33922929
Pulled By: ajkr
fbshipit-source-id: 0a298ec7c4df6f6b44620233996047a2dc7ee5f3
Summary:
**Context:**
Running the new test `DBMergeOperandTest.MergeOperandReadAfterFreeBug` prior to this fix surfaces the read-after-free bug of PinSef() as below:
```
READ of size 8 at 0x60400002529d thread T0
https://github.com/facebook/rocksdb/issues/5 0x7f199a in rocksdb::PinnableSlice::PinSelf(rocksdb::Slice const&) include/rocksdb/slice.h:171
https://github.com/facebook/rocksdb/issues/6 0x7f199a in rocksdb::DBImpl::GetImpl(rocksdb::ReadOptions const&, rocksdb::Slice const&, rocksdb::DBImpl::GetImplOptions&) db/db_impl/db_impl.cc:1919
https://github.com/facebook/rocksdb/issues/7 0x540d63 in rocksdb::DBImpl::GetMergeOperands(rocksdb::ReadOptions const&, rocksdb::ColumnFamilyHandle*, rocksdb::Slice const&, rocksdb::PinnableSlice*, rocksdb::GetMergeOperandsOptions*, int*) db/db_impl/db_impl.h:203
freed by thread T0 here:
https://github.com/facebook/rocksdb/issues/3 0x1191399 in rocksdb::cache_entry_roles_detail::RegisteredDeleter<rocksdb::Block, (rocksdb::CacheEntryRole)0>::Delete(rocksdb::Slice const&, void*) cache/cache_entry_roles.h:99
https://github.com/facebook/rocksdb/issues/4 0x719348 in rocksdb::LRUHandle::Free() cache/lru_cache.h:205
https://github.com/facebook/rocksdb/issues/5 0x71047f in rocksdb::LRUCacheShard::Release(rocksdb::Cache::Handle*, bool) cache/lru_cache.cc:547
https://github.com/facebook/rocksdb/issues/6 0xa78f0a in rocksdb::Cleanable::DoCleanup() include/rocksdb/cleanable.h:60
https://github.com/facebook/rocksdb/issues/7 0xa78f0a in rocksdb::Cleanable::Reset() include/rocksdb/cleanable.h:38
https://github.com/facebook/rocksdb/issues/8 0xa78f0a in rocksdb::PinnedIteratorsManager::ReleasePinnedData() db/pinned_iterators_manager.h:71
https://github.com/facebook/rocksdb/issues/9 0xd0c21b in rocksdb::PinnedIteratorsManager::~PinnedIteratorsManager() db/pinned_iterators_manager.h:24
https://github.com/facebook/rocksdb/issues/10 0xd0c21b in rocksdb::Version::Get(rocksdb::ReadOptions const&, rocksdb::LookupKey const&, rocksdb::PinnableSlice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, rocksdb::Status*, rocksdb::MergeContext*, unsigned long*, bool*, bool*, unsigned long*, rocksdb::ReadCallback*, bool*, bool) db/pinned_iterators_manager.h:22
https://github.com/facebook/rocksdb/issues/11 0x7f0fdf in rocksdb::DBImpl::GetImpl(rocksdb::ReadOptions const&, rocksdb::Slice const&, rocksdb::DBImpl::GetImplOptions&) db/db_impl/db_impl.cc:1886
https://github.com/facebook/rocksdb/issues/12 0x540d63 in rocksdb::DBImpl::GetMergeOperands(rocksdb::ReadOptions const&, rocksdb::ColumnFamilyHandle*, rocksdb::Slice const&, rocksdb::PinnableSlice*, rocksdb::GetMergeOperandsOptions*, int*) db/db_impl/db_impl.h:203
previously allocated by thread T0 here:
https://github.com/facebook/rocksdb/issues/1 0x1239896 in rocksdb::AllocateBlock(unsigned long, **rocksdb::MemoryAllocator*)** memory/memory_allocator.h:35
https://github.com/facebook/rocksdb/issues/2 0x1239896 in rocksdb::BlockFetcher::CopyBufferToHeapBuf() table/block_fetcher.cc:171
https://github.com/facebook/rocksdb/issues/3 0x1239896 in rocksdb::BlockFetcher::GetBlockContents() table/block_fetcher.cc:206
https://github.com/facebook/rocksdb/issues/4 0x122eae5 in rocksdb::BlockFetcher::ReadBlockContents() table/block_fetcher.cc:325
https://github.com/facebook/rocksdb/issues/5 0x11b1f45 in rocksdb::Status rocksdb::BlockBasedTable::MaybeReadBlockAndLoadToCache<rocksdb::Block>(rocksdb::FilePrefetchBuffer*, rocksdb::ReadOptions const&, rocksdb::BlockHandle const&, rocksdb::UncompressionDict const&, bool, rocksdb::CachableEntry<rocksdb::Block>*, rocksdb::BlockType, rocksdb::GetContext*, rocksdb::BlockCacheLookupContext*, rocksdb::BlockContents*) const table/block_based/block_based_table_reader.cc:1503
```
Here is the analysis:
- We have [PinnedIteratorsManager](https://github.com/facebook/rocksdb/blob/6.28.fb/db/version_set.cc#L1980) with `Cleanable` capability in our `Version::Get()` path. It's responsible for managing the life-time of pinned iterator and invoking registered cleanup functions during its own destruction.
- For example in case above, the merge operands's clean-up gets associated with this manger in [GetContext::push_operand](https://github.com/facebook/rocksdb/blob/6.28.fb/table/get_context.cc#L405). During PinnedIteratorsManager's [destruction](https://github.com/facebook/rocksdb/blob/6.28.fb/db/pinned_iterators_manager.h#L67), the release function associated with those merge operand data is invoked.
**And that's what we see in "freed by thread T955 here" in ASAN.**
- Bug 🐛: `PinnedIteratorsManager` is local to `Version::Get()` while the data of merge operands need to outlive `Version::Get` and stay till they get [PinSelf()](https://github.com/facebook/rocksdb/blob/6.28.fb/db/db_impl/db_impl.cc#L1905), **which is the read-after-free in ASAN.**
- This bug is likely to be an overlook of `PinnedIteratorsManager` when developing the API `DB::GetMergeOperands` cuz the current logic works fine with the existing case of getting the *merged value* where the operands do not need to live that long.
- This bug was not surfaced much (even in its unit test) due to the release function associated with the merge operands (which are actually blocks put in cache as you can see in `BlockBasedTable::MaybeReadBlockAndLoadToCache` **in "previously allocated by" in ASAN report**) is a cache entry deleter.
The deleter will call `Cache::Release()` which, for LRU cache, won't immediately deallocate the block based on LRU policy [unless the cache is full or being instructed to force erase](https://github.com/facebook/rocksdb/blob/6.28.fb/cache/lru_cache.cc#L521-L531)
- `DBMergeOperandTest.MergeOperandReadAfterFreeBug` makes the cache extremely small to force cache full.
**Summary:**
- Fix the bug by align `PinnedIteratorsManager`'s lifetime with the merge operands
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9507
Test Plan:
- New test `DBMergeOperandTest.MergeOperandReadAfterFreeBug`
- db bench on read path
- Setup (LSM tree with several levels, cache the whole db to avoid read IO, warm cache with readseq to avoid read IO): `TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks="fillrandom,readseq -num=1000000 -cache_size=100000000 -write_buffer_size=10000 -statistics=1 -max_bytes_for_level_base=10000 -level0_file_num_compaction_trigger=1``TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks="readrandom" -num=1000000 -cache_size=100000000 `
- Actual command run (run 20-run for 20 times and then average the 20-run's average micros/op)
- `for j in {1..20}; do (for i in {1..20}; do rm -rf /dev/shm/rocksdb/ && TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks="fillrandom,readseq,readrandom" -num=1000000 -cache_size=100000000 -write_buffer_size=10000 -statistics=1 -max_bytes_for_level_base=10000 -level0_file_num_compaction_trigger=1 | egrep 'readrandom'; done > rr_output_pre.txt && (awk '{sum+=$3; sum_sqrt+=$3^2}END{print sum/20, sqrt(sum_sqrt/20-(sum/20)^2)}' rr_output_pre.txt) >> rr_output_pre_2.txt); done`
- **Result: Pre-change: 3.79193 micros/op; Post-change: 3.79528 micros/op (+0.09%)**
(pre-change)sorted avg micros/op of each 20-run | std of micros/op of each 20-run | (post-change) sorted avg micros/op of each 20-run | std of micros/op of each 20-run
-- | -- | -- | --
3.58355 | 0.265209 | 3.48715 | 0.382076
3.58845 | 0.519927 | 3.5832 | 0.382726
3.66415 | 0.452097 | 3.677 | 0.563831
3.68495 | 0.430897 | 3.68405 | 0.495355
3.70295 | 0.482893 | 3.68465 | 0.431438
3.719 | 0.463806 | 3.71945 | 0.457157
3.7393 | 0.453423 | 3.72795 | 0.538604
3.7806 | 0.527613 | 3.75075 | 0.444509
3.7817 | 0.426704 | 3.7683 | 0.468065
3.809 | 0.381033 | 3.8086 | 0.557378
3.80985 | 0.466011 | 3.81805 | 0.524833
3.8165 | 0.500351 | 3.83405 | 0.529339
3.8479 | 0.430326 | 3.86285 | 0.44831
3.85125 | 0.434108 | 3.8717 | 0.544098
3.8556 | 0.524602 | 3.895 | 0.411679
3.8656 | 0.476383 | 3.90965 | 0.566636
3.8911 | 0.488477 | 3.92735 | 0.608038
3.898 | 0.493978 | 3.9439 | 0.524511
3.97235 | 0.515008 | 3.9623 | 0.477416
3.9768 | 0.519993 | 3.98965 | 0.521481
- CI
Reviewed By: ajkr
Differential Revision: D34030519
Pulled By: hx235
fbshipit-source-id: a99ac585c11704c5ed93af033cb29ba0a7b16ae8
Summary:
After https://github.com/facebook/rocksdb/issues/9515 added a unique_ptr to Status, we see some
warnings-as-error in some internal builds like this:
```
stderr: rocksdb/src/db/compaction/compaction_job.cc:2839:7: error:
offset of on non-standard-layout type 'struct CompactionServiceResult'
[-Werror,-Winvalid-offsetof]
{offsetof(struct CompactionServiceResult, status),
^ ~~~~~~
```
I see three potential solutions to resolving this:
* Expand our use of an idiom that works around the warning (see offset_of
functions removed in this change, inspired by
https://gist.github.com/graphitemaster/494f21190bb2c63c5516) However,
this construction is invoking undefined behavior that assumes consistent
layout with no compiler-introduced indirection. A compiler incompatible
with our assumptions will likely compile the code and exhibit undefined
behavior.
* Migrate to something in place of offset, like a function mapping
CompactionServiceResult* to Status* (for the `status` field). This might
be required in the long term.
* **Selected:** Use our new C++17 dependency to use offsetof in a well-defined way
when the compiler allows it. From a comment on
https://gist.github.com/graphitemaster/494f21190bb2c63c5516:
> A final note: in C++17, offsetof is conditionally supported, which
> means that you can use it on any type (not just standard layout
> types) and the compiler will error if it can't compile it correctly.
> That appears to be the best option if you can live with C++17 and
> don't need constexpr support.
The C++17 semantics are confirmed on
https://en.cppreference.com/w/cpp/types/offsetof, so we can suppress the
warning as long as we accept that we might run into a compiler that
rejects the code, and at that point we will find a solution, such as
the more intrusive "migrate" solution above.
Although this is currently only showing in our buck build, it will
surely show up also with make and cmake, so I have updated those
configurations as well.
Also in the buck build, -Wno-expansion-to-defined does not appear to be
needed anymore (both current compiler configurations) so I
removed it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9563
Test Plan: Tried out buck builds with both current compiler configurations
Reviewed By: riversand963
Differential Revision: D34220931
Pulled By: pdillinger
fbshipit-source-id: d39436008259bd1eaaa87c77be69fb2a5b559e1f
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9562
With per-transaction `read_timestamp_`, it is possible to perform transaction validation after
locking a key in addition to sequence-based validation. Specifically, if a transaction has a
read_timestamp, then we perform timestamp-based validation as well after the key is locked
via `GetForUpdate()`. This is to make sure that no other transaction has modified the key and
committed successfully since the read timestamp (but before the locking operation) which
represents a consistent view of the database.
Reviewed By: ltamasi
Differential Revision: D31822034
fbshipit-source-id: c6f1828b7fc23e4f85e2d1ed73ff51464a058d91
Summary:
* Fix LIB_MODE=shared for Meta-internal builds (use PIC libraries
appropriately)
* Fix gnu_parallel to recognize CircleCI and Travis builds as not
connected to a terminal (was previously relying on the
`| cat_ignore_eagain` stuff for Ubuntu 16). This problem could cause
timeouts that should be 10m to balloon to 5h.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9553
Test Plan: manual and CI
Reviewed By: jay-zhuang
Differential Revision: D34182886
Pulled By: pdillinger
fbshipit-source-id: e95fd8002d94c8dc414bae1975e4fd348589f2b5
Summary:
Transaction multiGet convert to list-based.
RocksDB Java (non-transactional) has multiGetAsList() methods to expose multiGet(). These return a list of results. These methods replaced multiGet() methods returning an array of results, which were deprecated in Rocks 6 and are being removed in Rocks 7.
The transactional API still presents multiGet() methods returning arrays, so in Rocks 7 we replace these with multiGetAsList()methods and deprecate the multiGet() methods.
This does not require any changes to the supporting JNI/C++ code, only to the wrappers which present the Java API.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9522
Reviewed By: mrambacher
Differential Revision: D34114373
Pulled By: jay-zhuang
fbshipit-source-id: cb22d6095934d951b6aee4aed3e07923d3c18007
Summary:
This change removes the ability to configure the deprecated,
inefficient block-based filter in the public API. Options that would
have enabled it now use "full" (and optionally partitioned) filters.
Existing block-based filters can still be read and used, and a "back
door" way to build them still exists, for testing and in case of trouble.
About the only way this removal would cause an issue for users is if
temporary memory for filter construction greatly increases. In
HISTORY.md we suggest a few possible mitigations: partitioned filters,
smaller SST files, or setting reserve_table_builder_memory=true.
Or users who have customized a FilterPolicy using the
CreateFilter/KeyMayMatch mechanism removed in https://github.com/facebook/rocksdb/issues/9501 will have to upgrade
their code. (It's long past time for people to move to the new
builder/reader customization interface.)
This change also introduces some internal-use-only configuration strings
for testing specific filter implementations while bypassing some
compatibility / intelligence logic. This is intended to hint at a path
toward making FilterPolicy Customizable, but it also gives us a "back
door" way to configure block-based filter.
Aside: updated db_bench so that -readonly implies -use_existing_db
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9535
Test Plan:
Unit tests updated. Specifically,
* BlockBasedTableTest.BlockReadCountTest is tweaked to validate the back
door configuration interface and ignoring of `use_block_based_builder`.
* BlockBasedTableTest.TracingGetTest is migrated from testing
block-based filter access pattern to full filter access patter, by
re-ordering some things.
* Options test (pretty self-explanatory)
Performance test - create with `./db_bench -db=/dev/shm/rocksdb1 -bloom_bits=10 -cache_index_and_filter_blocks=1 -benchmarks=fillrandom -num=10000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0` with and without `-use_block_based_filter`, which creates a DB with 21 SST files in L0. Read with `./db_bench -db=/dev/shm/rocksdb1 -readonly -bloom_bits=10 -cache_index_and_filter_blocks=1 -benchmarks=readrandom -num=10000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -duration=30`
Without -use_block_based_filter: readrandom 464 ops/sec, 689280 KB DB
With -use_block_based_filter: readrandom 169 ops/sec, 690996 KB DB
No consistent difference with fillrandom
Reviewed By: jay-zhuang
Differential Revision: D34153871
Pulled By: pdillinger
fbshipit-source-id: 31f4a933c542f8f09aca47fa64aec67832a69738
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9537
Add `Transaction::SetReadTimestampForValidation()` and
`Transaction::SetCommitTimestamp()` APIs with default implementation
returning `Status::NotSupported()`. Currently, calling these two APIs do not
have any effect.
Also add checks to `PessimisticTransactionDB`
to enforce that column families in the same db either
- disable user-defined timestamp
- enable 64-bit timestamp
Just to clarify, a `PessimisticTransactionDB` can have some column families without
timestamps as well as column families that enable timestamp.
Each `PessimisticTransaction` can have two optional timestamps, `read_timestamp_`
used for additional validation and `commit_timestamp_` which denotes when the transaction commits.
For now, we are going to support `WriteCommittedTxn` (in a series of subsequent PRs)
Once set, we do not allow decreasing `read_timestamp_`. The `commit_timestamp_` must be
greater than `read_timestamp_` for each transaction and must be set before commit, unless
the transaction does not involve any column family that enables user-defined timestamp.
TransactionDB builds on top of RocksDB core `DB` layer. Though `DB` layer assumes
that user-defined timestamps are byte arrays, `TransactionDB` uses uint64_t to store
timestamps. When they are passed down, they are still interpreted as
byte-arrays by `DB`.
Reviewed By: ltamasi
Differential Revision: D31567959
fbshipit-source-id: b0b6b69acab5d8e340cf174f33e8b09f1c3d3502
Summary:
This change should guarantee that the default ObjectLibrary/Registry are long-lived and not destroyed while the process is running. This will prevent some issues of them being referenced after they were destroyed via the static destruction.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9464
Reviewed By: pdillinger
Differential Revision: D33849876
Pulled By: mrambacher
fbshipit-source-id: 7a69177d7c58c81be293fc7ef8e600d47ddbc14b
Summary:
When tests are run with TMPD, c_test may fail because TMPD
is not created by the test. It results in IO error: No such file
or directory: While mkdir if missing:
/tmp/rocksdb_test_tmp/rocksdb_c_test-0: No such file or directory
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9547
Test Plan:
make -j32 c_test;
TEST_TMPDIR=/tmp/rocksdb_test ./c_test
Reviewed By: riversand963
Differential Revision: D34173298
Pulled By: akankshamahajan15
fbshipit-source-id: 5b5a01f5b842c2487b05b0708c8e9532241db7f8
Summary:
We had a bug in `VersionStorageInfo::ComputeFilesMarkedForForcedBlobGC`
related to the edge case where all blob files are part of the "oldest batch",
i.e. where only the very oldest file has any linked SSTs. (See https://github.com/facebook/rocksdb/issues/9542)
This PR tries to make the logic in this method clearer and also adds a unit test
for the problematic case.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9548
Test Plan: `make check`
Reviewed By: akankshamahajan15
Differential Revision: D34158959
Pulled By: ltamasi
fbshipit-source-id: fbab6d749c569728382aa04f7b7c60c92cca7650
Summary:
This fix addresses https://github.com/facebook/rocksdb/issues/9299.
If attempting to create a new object via the ObjectRegistry and a factory is not found, the ObjectRegistry will return a "NotSupported" status. This is the same behavior as previously.
If the factory is found but could not successfully create the object, an "InvalidArgument" status is returned. If the factory returned a reason why (in the errmsg), this message will be in the returned status.
In practice, there are two options in the ConfigOptions that control how these errors are propagated:
- If "ignore_unknown_options=true", then both InvalidArgument and NotSupported status codes will be swallowed internally. Both cases will return success
- If "ignore_unsupported_options=true", then having no factory will return success but a failing factory will return an error
- If both options are false, both cases (no and failing factory) will return errors.
In practice this likely only changes Customizable that may be partially available. For example, the JEMallocMemoryAllocator is a built-in allocator that is registered with the system but may not be compiled in. In this case, the status code for this allocator changed from NotSupported("JEMalloc not available") to InvalidArgumen("JEMalloc not available"). Other Customizable builtins/plugins would have the same semantics.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9333
Reviewed By: pdillinger
Differential Revision: D33517681
Pulled By: mrambacher
fbshipit-source-id: 8033052d4a4a7b88c2d9f90147b1b4467e51f6fd
Summary:
Extend the periodic statistics in the info log with the total amount of garbage
in blob files and the space amplification pertaining to blob files, where the
latter is defined as `total_blob_file_size / (total_blob_file_size - total_blob_garbage_size)`.
Also expose the space amp via the `rocksdb.blob-stats` DB property.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9538
Test Plan: `make check`
Reviewed By: riversand963
Differential Revision: D34126855
Pulled By: ltamasi
fbshipit-source-id: 3153e7a0fe0eca440322db273f4deaabaccc51b2
