Summary:
- Made it clear only one record in the tail is allowed to have a problem
- Added detail about the valid use case instead of calling it legacy behavior
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7270
Reviewed By: riversand963
Differential Revision: D23169075
Pulled By: ajkr
fbshipit-source-id: 2a4b45aa8641f17efa104523fbad765012a98fb0
Summary:
Some tests like BackupableDBTest.FileCollision and
ShareTableFilesWithChecksumsNewNaming are intermittently failing,
probably due to unpredictable flushing with FillDB. This change
should fix the failures seen and help to prevent similar flakiness in
future tests in the file.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7273
Test Plan: make check, and with valgrind
Reviewed By: siying
Differential Revision: D23176947
Pulled By: pdillinger
fbshipit-source-id: 654b73a64db475f2b9b065ed53a889a8b9083c59
Summary:
After https://github.com/facebook/rocksdb/pull/7036, we still see extra DBTest that can timeout when running 10 or 20 in parallel. Expand skip-fsync mode in whole DBTest. Still preserve other tests from doing this mode to be conservative.
This commit reinstates https://github.com/facebook/rocksdb/issues/7049, whose un-revert was lost in an automatic
infrastructure mis-merge.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7274
Test Plan: Run all existing files.
Reviewed By: pdillinger
Differential Revision: D23177444
fbshipit-source-id: 1f61690b2ac6333c3b2c87176fef6b2cba086b33
Summary:
The two features are naturally incompatible. WAL recycling expects the recovery to succeed upon encountering a corrupt record at the point where new data ends and recycled data remains at the tail. However, `WALRecoveryMode::kTolerateCorruptedTailRecords` must fail upon encountering any such corrupt record, as it cannot differentiate between this and a real corruption, which would cause committed updates to be truncated.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7271
Reviewed By: riversand963
Differential Revision: D23169923
Pulled By: ajkr
fbshipit-source-id: 2cf8a3bcd2c9a0ecb0055a84725047a10fd4db50
Summary:
Add `kEntryDeleteWithTimestamp` to `EntryType` which is a public API.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7195
Test Plan: make check
Reviewed By: ajkr
Differential Revision: D22914704
Pulled By: riversand963
fbshipit-source-id: 886f73c6b70c527cad1c8fc9fc8d3afe60e1ea39
Summary:
The patch makes sure that the functionality required for the new integrated
BlobDB implementation (most importantly, the classes related to reading and
writing blob files) is also built in LITE mode by removing the corresponding
`#ifndef`s.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7272
Test Plan: Ran `make check` in both regular and LITE mode.
Reviewed By: zhichao-cao
Differential Revision: D23173280
Pulled By: ltamasi
fbshipit-source-id: 1596bd1a76409a8a6d83d8f1dbfe08bfdea7ffe6
Summary:
There is potential data race related CompactRange() with level refitting. After the compaction step and refitting step, some automatic compaction could put data to the destination level and cause the DB to be corrupted. Fix the bug by checking the target level to be empty.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7261
Test Plan: Add a unit test, which would fail with "Corruption: L1 have overlapping ranges '666F6F' seq:6, type:1 vs. '626172' seq:2, type:1", and now it succeeds.
Reviewed By: ajkr
Differential Revision: D23142269
fbshipit-source-id: 28bc14d5ac934c192260b23a4ce3f10a95e3ee91
Summary:
The param tests did not take any effect previously. This PR re-enables it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7260
Test Plan: Some manual tests and `./backupable_db_test`.
Reviewed By: siying
Differential Revision: D23140902
Pulled By: pdillinger
fbshipit-source-id: cd62b11b926affed25127d9074fa97a1c7f748c4
Summary:
Looks like somebody simply missed initializing a member variable. The column family ID, cf_id, is not set during OnCompactionBegin. But it is set properly in the next function for OnCompactionCompleted. Need this cf_id for tracking progress of a Stardog optimize since there may be multiple compactions required for a given column family.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6938
Reviewed By: siying
Differential Revision: D23153235
Pulled By: ajkr
fbshipit-source-id: 932938de3a4ebbc7ac89702f655583862587d251
Summary:
This pull request adds the parameter --fs_uri to db_bench and db_stress, creating a composite env combining the default env with a specified registered rocksdb file system.
This makes it easier to develop and test new RocksDB FileSystems.
The pull request also registers the posix file system for testing purposes.
Examples:
```
$./db_bench --fs_uri=posix:// --benchmarks=fillseq
$./db_stress --fs_uri=zenfs://nullb1
```
zenfs is a RocksDB FileSystem I'm developing to add support for zoned block devices, and in that case the zoned block device is specified in the uri (a zoned null block device in the above example).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6878
Reviewed By: siying
Differential Revision: D23023063
Pulled By: ajkr
fbshipit-source-id: 8b3fe7193ce45e683043b021779b7a4d547af247
Summary:
pkg-config files are quite useful for communicating to users of a
library how to compile against them. This commit generates and installs
a pkg-config file that can be used for both static and dynamic builds
against the RocksDB library. This should make life easier for developers
of client programs, language bindings, etc.
Example usage:
```
g++ `pkg-config --cflags rocksdb` -o simple_example simple_example.cc `pkg-config --libs rocksdb`
g++ `pkg-config --cflags --static rocksdb` -static \
-o simple_example simple_example.cc `pkg-config --libs --static rocksdb`
```
The commit also adds the generated file to .gitignore, to the uninstall
target, and to clean.
No additional dependencies are added to RocksDB itself, and this does
not make RocksDB use pkg-config as part of its build process.
Resolves https://github.com/facebook/rocksdb/issues/4452
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7244
Reviewed By: siying
Differential Revision: D23146153
Pulled By: ajkr
fbshipit-source-id: 3045aa650d68bd5ac42d40ed709570e9584ef004
Summary:
Have a global StatsDumpScheduler for all DB instance stats dumping, including `DumpStats()` and `PersistStats()`. Before this, there're 2 dedicate threads for every DB instance, one for DumpStats() one for PersistStats(), which could create lots of threads if there're hundreds DB instances.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7223
Reviewed By: riversand963
Differential Revision: D23056737
Pulled By: jay-zhuang
fbshipit-source-id: 0faa2311142a73433ebb3317361db7cbf43faeba
Summary:
If user-defined timestamp is enabled, current implementation can expose
newer data to queries even if an older sequence number is specified via
read_options.snapshot. This PR makes Get() respect sequence-number-based
snapshot.
Solution is simple. Besides using <ukey, ts, seq> to search the index for the key,
we also verify that the candidate result's seq is smaller than or equal to seq. This
requires passing a seq via `GetContext`, which results in the majority of code
change caused by this PR.
Also added a few unit tests to demonstrate standard visibility during point lookup
and range scan when timestamp and snapshot are both present.
Test plan (devserver):
```
make check
$./db_bench --benchmarks=fillseq,readrandom -cache_size=$[64*1024*1024]
```
Result
this PR: readrandom : 4.827 micros/op 207180 ops/sec; 22.9 MB/s (1000000 of 1000000 found)
master: readrandom : 4.936 micros/op 202610 ops/sec; 22.4 MB/s (1000000 of 1000000 found)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7227
Reviewed By: ltamasi
Differential Revision: D23015242
Pulled By: riversand963
fbshipit-source-id: ea7b85a728654553ba357d2e6a207b5e40f7376a
Summary:
The flaky test in the title is caused by two problems. First, there is a bug in the BackupEngine that results in skipping computing the default crc32 checksum when `share_table_files` is enabled and the table is already backed up. Second, when `RestoreDBFromBackup` fails and the backup was being restored to the DB directory, it is likely that `RestoreDBFromBackup` has cleaned up the DB directory before it fails, and therefore, files in old backups may collide with files to be backed up if `share_files_with_checksum` is not enabled.
New tests that cover the above problems are added.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7254
Test Plan: `./backupable_db_test`
Reviewed By: pdillinger
Differential Revision: D23118715
Pulled By: gg814
fbshipit-source-id: 7be8de912808944be59e93d602c7431a54c079eb
Summary:
Manual compaction with `CompactRangeOptions::change_levels` set could
refit to a level targeted by another manual compaction. If
force_consistency_checks were disabled, it could be possible for
overlapping files to be written at that target level.
This PR prevents the possibility by calling `DisableManualCompaction()`
prior to `ReFitLevel()`. It also improves the manual compaction disabling
mechanism to wait for pending manual compactions to complete before
returning, and support disabling from multiple threads.
Fixes https://github.com/facebook/rocksdb/issues/6432.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7250
Test Plan:
crash test command that repro'd the bug reliably:
```
$ TEST_TMPDIR=/dev/shm python tools/db_crashtest.py blackbox --simple -target_file_size_base=524288 -write_buffer_size=1048576 -clear_column_family_one_in=0 -reopen=0 -max_key=10000000 -column_families=1 -max_background_compactions=8 -compact_range_one_in=100000 -compression_type=none -compaction_style=1 -num_levels=5 -universal_min_merge_width=4 -universal_max_merge_width=8 -level0_file_num_compaction_trigger=12 -rate_limiter_bytes_per_sec=1048576000 -universal_max_size_amplification_percent=100 --duration=3600 --interval=60 --use_direct_io_for_flush_and_compaction=0 --use_direct_reads=0 --enable_compaction_filter=0
```
Reviewed By: ltamasi
Differential Revision: D23090800
Pulled By: ajkr
fbshipit-source-id: afcbcd51b42ce76789fdb907d8b9ada790709c13
Summary:
Previously RocksJava limited the format_version to 4. However, the C++ API is now at 5, and this will likely increase again in future. The Java API now allows any positive integer, and an exception is raised from JNI if the format_version is out-of-bounds.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7242
Reviewed By: cheng-chang
Differential Revision: D23077941
Pulled By: pdillinger
fbshipit-source-id: ee69f7203448acddc41c6d86b470ed987d3d366d
Summary:
We see some hosts failed to build platform009 with gcc. Revert the default to be platform007 if USE_CLANG is not specified.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7253
Test Plan: Build with both of USE_CLANG=1 set and not set and observe it builds successfully, and see the tool chain used.
Reviewed By: jay-zhuang
Differential Revision: D23110550
fbshipit-source-id: 25cb47923f7174b24debdad0cc8d90b07c4d5d09
Summary:
Upgrade tool chain to the latest. It is done mostly manually as build_tools/build_detect_platform fails to update many of them.
Try to fix a new clang analyze warning with the new tool chain.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7251
Test Plan: "make all", "USE_CLANG=1 make all"
Reviewed By: riversand963
Differential Revision: D23091090
fbshipit-source-id: 732e5a30137837431438f85f36296406b641f975
Summary:
The patch cleans up and refactors `CompressBlock` and `CompressBlockInternal` a bit.
In particular, it does the following:
* It renames `CompressBlockInternal` to `CompressData` and moves it to `util/compression.h`,
where other general compression-related utilities are located. This will facilitate reuse in the
BlobDB write path.
* The signature of the method is changed so it now takes `compression_format_version`
(similarly to the compression library specific methods) instead of `format_version` (which is
specific to the block based table).
* `GetCompressionFormatForVersion` no longer takes `compression_type` as a parameter.
This parameter was only used in a (not entirely up-to-date) assertion; also, removing it
eliminates the need to ensure this precondition holds at all call sites.
* Does some minor cleanup in `CompressBlock`, for instance, it is now possible to pass
only one of `sampled_output_fast` and `sampled_output_slow`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7249
Test Plan: `make check`
Reviewed By: riversand963
Differential Revision: D23087278
Pulled By: ltamasi
fbshipit-source-id: e6316e45baed8b4e7de7c1780c90501c2a3439b3
Summary:
As part of the IOTracing project, this PR
1. Caches "FileSystemPtr" object(wrapper class that returns file system pointer based on tracing enabled) instead of "FileSystem" pointer.
2. FileSystemPtr object is created using FileSystem pointer and IOTracer
pointer.
3. IOTracer shared_ptr is created in DBImpl and it is passed to different classes through constructor.
4. When tracing is enabled through DB::StartIOTrace, FileSystemPtr
returns FileSystemTracingWrapper pointer for tracing purpose and when
it is disabled underlying FileSystem pointer is returned.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7180
Test Plan:
make check -j64
COMPILE_WITH_TSAN=1 make check -j64
Reviewed By: anand1976
Differential Revision: D22987117
Pulled By: akankshamahajan15
fbshipit-source-id: 6073617e4c2d5bc363914f3a1f55ae3b0a58fbf1
Summary:
The PR fixes a Java test for Merge operator `uint64add`.
The current implementation uses wrong byte order for long serialization, but fails to catch this error because the merge sum is lower than `256`.
The PR makes this test case more representative (i.e. it fails with wrong byte order) and changes the byte order to little endian.
Some background: RocksDB uses LittleEndian byte order for integer serialization across all platforms. `MergeTest` uses `ByteBuffer` that defaults to BigEndian byte order.
This test case might probably be used as a sample of `MergeOperator` usage in Java.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7243
Reviewed By: ajkr
Differential Revision: D23079593
Pulled By: pdillinger
fbshipit-source-id: 82e8e166901d66733e96a0116f88d0ec4761ddf1
Summary:
A new option `std::shared_ptr<FileChecksumGenFactory> backup_checksum_gen_factory` is added to `BackupableDBOptions`. This allows custom checksum functions to be used for creating, verifying, or restoring backups.
Tests are added.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7085
Test Plan: Passed make check
Reviewed By: pdillinger
Differential Revision: D22390756
Pulled By: gg814
fbshipit-source-id: 3b7756ca444c2129844536b91c3ca09f53b6248f
Summary:
```
int* value = new int;
ASSERT_NE(nullptr, value);
```
`ASSERT_NE` can expand the expression such that a memory leak is
reported by clang analyzer.
We can remove this ASSERT_NE since we can assume the memory allocation
must succeed. Otherwise a bad alloc exception will be thrown and the
process will be killed anyway.
Test plan (dev server):
```
USE_CLANG=1 make analyze
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7245
Reviewed By: jay-zhuang
Differential Revision: D23079641
Pulled By: riversand963
fbshipit-source-id: a6739a903f90f8715f6f1ef3e5c8a329245b8e78
Summary:
The patch updates github-pages to the latest version. Dependencies were
updated using `bundle update`. Also, the deprecated option `gems` is replaced
with `plugins` in the Jekyll config.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7235
Test Plan: `bundle exec jekyll serve`
Reviewed By: pdillinger
Differential Revision: D23034419
Pulled By: ltamasi
fbshipit-source-id: a3f6df1c33281bdfd33aa61c6dc92162d9b7f079
Summary:
Timer (defined in timer.h) schedules and runs user-specified fuctions
regularly. Current implementation holds the mutex while running user
function, which will lead to contention and waiting.
To fix, Timer::Run releases mutex before running user function, and
re-acquires it afterwards.
This fix will impact how we can cancel a task. If the task is running,
it is not holding the mutex. The thread calling Cancel() should wait
until the current task finishes.
Test Plan (devserver):
make check
COMPILE_WITH_ASAN=1 make check
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7228
Reviewed By: jay-zhuang
Differential Revision: D23065487
Pulled By: riversand963
fbshipit-source-id: 07cb59741f506d3eb875c8ab90f73437568d3724
Summary:
We have a number of tests hanging on MacOS and windows due to
mishandling of code for mock sleeps. In addition, the code was in
terrible shape because the same variable (addon_time_) would sometimes
refer to microseconds and sometimes to seconds. One test even assumed it
was nanoseconds but was written to pass anyway.
This has been cleaned up so that DB tests generally use a SpecialEnv
function to mock sleep, for either some number of microseconds or seconds
depending on the function called. But to call one of these, the test must first
call SetMockSleep (precondition enforced with assertion), which also turns
sleeps in RocksDB into mock sleeps. To also removes accounting for actual
clock time, call SetTimeElapseOnlySleepOnReopen, which implies
SetMockSleep (on DB re-open). This latter setting only works by applying
on DB re-open, otherwise havoc can ensue if Env goes back in time with
DB open.
More specifics:
Removed some unused test classes, and updated comments on the general
problem.
Fixed DBSSTTest.GetTotalSstFilesSize using a sync point callback instead
of mock time. For this we have the only modification to production code,
inserting a sync point callback in flush_job.cc, which is not a change to
production behavior.
Removed unnecessary resetting of mock times to 0 in many tests. RocksDB
deals in relative time. Any behaviors relying on absolute date/time are likely
a bug. (The above test DBSSTTest.GetTotalSstFilesSize was the only one
clearly injecting a specific absolute time for actual testing convenience.) Just
in case I misunderstood some test, I put this note in each replacement:
// NOTE: Presumed unnecessary and removed: resetting mock time in env
Strengthened some tests like MergeTestTime, MergeCompactionTimeTest, and
FilterCompactionTimeTest in db_test.cc
stats_history_test and blob_db_test are each their own beast, rather deeply
dependent on MockTimeEnv. Each gets its own variant of a work-around for
TimedWait in a mock time environment. (Reduces redundancy and
inconsistency in stats_history_test.)
Intended follow-up:
Remove TimedWait from the public API of InstrumentedCondVar, and only
make that accessible through Env by passing in an InstrumentedCondVar and
a deadline. Then the Env implementations mocking time can fix this problem
without using sync points. (Test infrastructure using sync points interferes
with individual tests' control over sync points.)
With that change, we can simplify/consolidate the scattered work-arounds.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7101
Test Plan: make check on Linux and MacOS
Reviewed By: zhichao-cao
Differential Revision: D23032815
Pulled By: pdillinger
fbshipit-source-id: 7f33967ada8b83011fb54e8279365c008bd6610b
Summary:
`VersionStorageInfo::AddFile` currently has a debug-mode consistency
check to make sure the newly added file does not overlap with the
previous one (for levels below L0). Considering that
`VersionBuilder::CheckConsistency` also performs similar checks (in
fact, those checks are more comprehensive and cover L0 as well), this
check is redundant. The patch removes it and also cleans up `AddFile` a
little.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7237
Test Plan: `make check`
Reviewed By: riversand963
Differential Revision: D23041937
Pulled By: ltamasi
fbshipit-source-id: e00665f3b83bfd17f86c54c238800f3d77d739bd
Summary:
The mechanism to mark files for compaction is most commonly used in
delete-triggered compaction. This PR adds an option to exercise the
marking mechanism on random files created by db_stress. This PR also
enables that option in db_crashtest.py on its db_stress runs at random.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7231
Test Plan:
- ran some minified crash tests; verified they succeed and we see `"compaction_reason": "FilesMarkedForCompaction"` regularly in the logs.
```
$ TEST_TMPDIR=/dev/shm python tools/db_crashtest.py blackbox --duration=600 --interval=30 --max_key=10000000 --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --value_size_mult=33
$ TEST_TMPDIR=/dev/shm python tools/db_crashtest.py whitebox --duration=600 --interval=30 --max_key=1000000 --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --value_size_mult=33 --random_kill_odd=8887
```
Reviewed By: anand1976
Differential Revision: D23025156
Pulled By: ajkr
fbshipit-source-id: a404c467ebc12afa94dae35956ea9b372f592a96
Summary:
Delete triggered compaction (DTC) for universal compaction style with ```num_levels = 1``` has been disabled for sometime due to a data correctness bug. This PR re-enables it with a bug fix. A file marked for compaction can be picked, along with all L0 files after it as the compaction input. We stop adding files to the input once we encounter a file already being compacted (the original bug failed to check the compaction status of the files).
Tests:
Add unit tests to ```compaction_picker_test.cc```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7224
Reviewed By: ajkr
Differential Revision: D23031845
Pulled By: anand1976
fbshipit-source-id: 9de3cab5f9774cede666c2c48d309a7d9b88a505
Summary:
`-O3` is already adopted widely, so we should make it easier to configure
for development/open source. This PR adds an `OPTIMIZE_LEVEL` variable
that users can set to override the `-O` flag chosen in the Makefile.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7202
Test Plan: built a few different ways and verified correct value is passed for `-O` flag
Reviewed By: pdillinger
Differential Revision: D22845291
Pulled By: ajkr
fbshipit-source-id: 84471362e7d627dd606b25bf5f6a3d796817fa1c
Summary:
Trying to fix issue that caused two failures out of eight most
recent master builds
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7234
Test Plan: Watch CircleCI
Reviewed By: riversand963
Differential Revision: D23032184
Pulled By: pdillinger
fbshipit-source-id: dae403f63c0e4f6ab8a3e8e49a49069a532b8f4a
Summary:
The debug is supposed to print out two keys to show the value mismatch, which was compared just a few lines above.
However, the actual print-out is the same values (so they obviously won't be mismatched)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6587
Reviewed By: riversand963
Differential Revision: D23025279
Pulled By: ajkr
fbshipit-source-id: 4c6c35bc60b273f13c08b5464b6f690d8a5cfe41
Summary:
Introduce io_timeout in ReadOptions and enabled deadline/io_timeout for
Iterators.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7161
Test Plan: New unit tests in db_basic_test
Reviewed By: riversand963
Differential Revision: D22687352
Pulled By: anand1976
fbshipit-source-id: 67bbb0e6d7ae80b256589244468494292538c6ec
Summary:
Pointed out by https://github.com/facebook/rocksdb/issues/7197 , there is a double lock in WriteImplWALOnly.
Also find another deadlock in UnorderedWriteMemtable. Move the check after switch_all_.notify_all().
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7199
Test Plan: pass make check
Reviewed By: anand1976
Differential Revision: D22961714
Pulled By: zhichao-cao
fbshipit-source-id: 0707922dc50d28ea141a15a8cdcbd1c8993ea0d8
Summary:
A colon will be added after 'msg' automatically when invoke function Status(Code _code, const Slice& msg, const Slice& msg2),
it's not needed to append a colon explicitly to 'msg'.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7041
Reviewed By: ajkr
Differential Revision: D22292801
fbshipit-source-id: 8f2d69065bb779d2613468bf9fc9169f32c3f1ec
Summary:
Improvements to the RocksJava release process:
* Generates the Maven artifact version number as part of the release step
* Also generates appropriate checksum files to speed the deploy and publish step
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7219
Reviewed By: ltamasi
Differential Revision: D22983481
Pulled By: pdillinger
fbshipit-source-id: 7b8ffaf46471cd3cda181eb830c962b317d2e688
Summary:
We're going to support more locking protocols such as range lock in transaction.
However, in current design, `TransactionBase` has a member `tracked_keys` which assumes that point lock (lock a single key) is used, and is used in snapshot checking (isolation protocol). When using range lock, we may use read committed instead of snapshot checking as the isolation protocol.
The most significant usage scenarios of `tracked_keys` are:
1. pessimistic transaction uses it to track the locked keys, and unlock these keys when commit or rollback.
2. optimistic transaction does not lock keys upfront, it only tracks the lock intentions in tracked_keys, and do write conflict checking when commit.
3. each `SavePoint` tracks the keys that are locked since the `SavePoint`, `RollbackToSavePoint` or `PopSavePoint` relies on both the tracked keys in `SavePoint`s and `tracked_keys`.
Based on these scenarios, if we can abstract out a `LockTracker` interface to hold a set of tracked locks (can be keys or key ranges), and have methods that can be composed together to implement the scenarios, then `tracked_keys` can be an internal data structure of one implementation of `LockTracker`. See `utilities/transactions/lock/lock_tracker.h` for the detailed interface design, and `utilities/transactions/lock/point_lock_tracker.cc` for the implementation.
In the future, a `RangeLockTracker` can be implemented to track range locks without affecting other components.
After this PR, a clean interface for lock manager should be possible, and then ideally, we can have pluggable locking protocols.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7013
Test Plan: Run `transaction_test` and `optimistic_transaction_test`.
Reviewed By: ajkr
Differential Revision: D22163706
Pulled By: cheng-chang
fbshipit-source-id: f2860577b5334e31dd2994f5bc6d7c40d502b1b4
Summary:
`WalAddition`, `WalDeletion` are defined in `wal_version.h` and used in `VersionEdit`.
`WalAddition` is used to represent events of creating a new WAL (no size, just log number), or closing a WAL (with size).
`WalDeletion` is used to represent events of deleting or archiving a WAL, it means the WAL is no longer alive (won't be replayed during recovery).
`WalSet` is the set of alive WALs kept in `VersionSet`.
1. Why use `WalDeletion` instead of relying on `MinLogNumber` to identify outdated WALs
On recovery, we can compute `MinLogNumber()` based on the log numbers kept in MANIFEST, any log with number < MinLogNumber can be ignored. So it seems that we don't need to persist `WalDeletion` to MANIFEST, since we can ignore the WALs based on MinLogNumber.
But the `MinLogNumber()` is actually a lower bound, it does not exactly mean that logs starting from MinLogNumber must exist. This is because in a corner case, when a column family is empty and never flushed, its log number is set to the largest log number, but not persisted in MANIFEST. So let's say there are 2 column families, when creating the DB, the first WAL has log number 1, so it's persisted to MANIFEST for both column families. Then CF 0 is empty and never flushed, CF 1 is updated and flushed, so a new WAL with log number 2 is created and persisted to MANIFEST for CF 1. But CF 0's log number in MANIFEST is still 1. So on recovery, MinLogNumber is 1, but since log 1 only contains data for CF 1, and CF 1 is flushed, log 1 might have already been deleted from disk.
We can make `MinLogNumber()` be the exactly minimum log number that must exist, by persisting the most recent log number for empty column families that are not flushed. But if there are N such column families, then every time a new WAL is created, we need to add N records to MANIFEST.
In current design, a record is persisted to MANIFEST only when WAL is created, closed, or deleted/archived, so the number of WAL related records are bounded to 3x number of WALs.
2. Why keep `WalSet` in `VersionSet` instead of applying the `VersionEdit`s to `VersionStorageInfo`
`VersionEdit`s are originally designed to track the addition and deletion of SST files. The SST files are related to column families, each column family has a list of `Version`s, and each `Version` keeps the set of active SST files in `VersionStorageInfo`.
But WALs are a concept of DB, they are not bounded to specific column families. So logically it does not make sense to store WALs in a column family's `Version`s.
Also, `Version`'s purpose is to keep reference to SST / blob files, so that they are not deleted until there is no version referencing them. But a WAL is deleted regardless of version references.
So we keep the WALs in `VersionSet` for the purpose of writing out the DB state's snapshot when creating new MANIFESTs.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7164
Test Plan:
make version_edit_test && ./version_edit_test
make wal_edit_test && ./wal_edit_test
Reviewed By: ltamasi
Differential Revision: D22677936
Pulled By: cheng-chang
fbshipit-source-id: 5a3b6890140e572ffd79eb37e6e4c3c32361a859
Summary:
FaultInjectionTestFS::NewDirectory currently asserts that the directory
creation on the target filesystem succeeds. This is actually not
guaranteed since there might be a legitimate I/O error when creating the
directory. The patch removes this assertion.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7220
Test Plan: `make check`
Reviewed By: zhichao-cao
Differential Revision: D22957990
Pulled By: ltamasi
fbshipit-source-id: b2e221320d8ce7235cb4897ef5936072412a25b6
Summary:
IteratorIterator::IsOutOfBound() and IteratorIterator::MayBeOutOfUpperBound() are two functions that related to upper bound check. It is hard for users to reason about this complexity. Consolidate the two functions into one and assign an enum as results to improve readability.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7200
Test Plan: Run all existing test. Would run crash test with atomic for a while.
Reviewed By: anand1976
Differential Revision: D22833181
fbshipit-source-id: a0c724267056adbd0476bde74650e6c7226077e6
Summary:
as title.
When ReadOptions.iter_start_ts is not nullptr, DBIter::key() should
return internal keys including value type.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7178
Test Plan: make check
Reviewed By: ltamasi
Differential Revision: D22935879
Pulled By: riversand963
fbshipit-source-id: 7508d962cf11ebcfa6386d2529b4f3606b47ccfd
Summary:
https://github.com/facebook/rocksdb/pull/5289 introduces a performance regression that caused an upper bound check within every BlockBasedTableIterator::Next(). This is unnecessary if we've checked the boundary key for current block and it is within upper bound.
Fix the bug. Also rename the boolean to a enum so that the code is slightly better readable. The original regression was probably to fix a bug that the block upper bound check status is not reset after a new block is created. Fix it bug so that the regression can be avoided without hitting the bug.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7209
Test Plan: Run all existing tests. Will run atomic black box crash test for a while.
Reviewed By: anand1976
Differential Revision: D22859246
fbshipit-source-id: cbdad1f5e656c55fd8b71726d5a4f6cb53ff9140
Andrew Kryczka