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500 Commits (3b8164912e1f0333fb3458c99cc3ad2a3c10500e)
| Author | SHA1 | Message | Date |
|---|---|---|---|
slk
|
95305c44a1 |
Add OpenAndTrimHistory API to support trimming data with specified timestamp (#9410)
Summary: As disscussed in (https://github.com/facebook/rocksdb/issues/9223), Here added a new API named DB::OpenAndTrimHistory, this API will open DB and trim data to the timestamp specofied by **trim_ts** (The data with newer timestamp than specified trim bound will be removed). This API should only be used at a timestamp-enabled db instance recovery. And this PR implemented a new iterator named HistoryTrimmingIterator to support trimming history with a new API named DB::OpenAndTrimHistory. HistoryTrimmingIterator wrapped around the underlying InternalITerator such that keys whose timestamps newer than **trim_ts** should not be returned to the compaction iterator while **trim_ts** is not null. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9410 Reviewed By: ltamasi Differential Revision: D34410207 Pulled By: riversand963 fbshipit-source-id: e54049dc234eccd673244c566b15df58df5a6236 |
3 years ago |
|
Yanqin Jin
|
3b6dc049f7 |
Support user-defined timestamps in write-committed txns (#9629)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9629 Pessimistic transactions use pessimistic concurrency control, i.e. locking. Keys are locked upon first operation that writes the key or has the intention of writing. For example, `PessimisticTransaction::Put()`, `PessimisticTransaction::Delete()`, `PessimisticTransaction::SingleDelete()` will write to or delete a key, while `PessimisticTransaction::GetForUpdate()` is used by application to indicate to RocksDB that the transaction has the intention of performing write operation later in the same transaction. Pessimistic transactions support two-phase commit (2PC). A transaction can be `Prepared()`'ed and then `Commit()`. The prepare phase is similar to a promise: once `Prepare()` succeeds, the transaction has acquired the necessary resources to commit. The resources include locks, persistence of WAL, etc. Write-committed transaction is the default pessimistic transaction implementation. In RocksDB write-committed transaction, `Prepare()` will write data to the WAL as a prepare section. `Commit()` will write a commit marker to the WAL and then write data to the memtables. While writing to the memtables, different keys in the transaction's write batch will be assigned different sequence numbers in ascending order. Until commit/rollback, the transaction holds locks on the keys so that no other transaction can write to the same keys. Furthermore, the keys' sequence numbers represent the order in which they are committed and should be made visible. This is convenient for us to implement support for user-defined timestamps. Since column families with and without timestamps can co-exist in the same database, a transaction may or may not involve timestamps. Based on this observation, we add two optional members to each `PessimisticTransaction`, `read_timestamp_` and `commit_timestamp_`. If no key in the transaction's write batch has timestamp, then setting these two variables do not have any effect. For the rest of this commit, we discuss only the cases when these two variables are meaningful. read_timestamp_ is used mainly for validation, and should be set before first call to `GetForUpdate()`. Otherwise, the latter will return non-ok status. `GetForUpdate()` calls `TryLock()` that can verify if another transaction has written the same key since `read_timestamp_` till this call to `GetForUpdate()`. If another transaction has indeed written the same key, then validation fails, and RocksDB allows this transaction to refine `read_timestamp_` by increasing it. Note that a transaction can still use `Get()` with a different timestamp to read, but the result of the read should not be used to determine data that will be written later. commit_timestamp_ must be set after finishing writing and before transaction commit. This applies to both 2PC and non-2PC cases. In the case of 2PC, it's usually set after prepare phase succeeds. We currently require that the commit timestamp be chosen after all keys are locked. This means we disallow the `TransactionDB`-level APIs if user-defined timestamp is used by the transaction. Specifically, calling `PessimisticTransactionDB::Put()`, `PessimisticTransactionDB::Delete()`, `PessimisticTransactionDB::SingleDelete()`, etc. will return non-ok status because they specify timestamps before locking the keys. Users are also prompted to use the `Transaction` APIs when they receive the non-ok status. Reviewed By: ltamasi Differential Revision: D31822445 fbshipit-source-id: b82abf8e230216dc89cc519564a588224a88fd43 |
3 years ago |
|
Hui Xiao
|
ca0ef54f16 |
Rate-limit automatic WAL flush after each user write (#9607)
Summary: **Context:** WAL flush is currently not rate-limited by `Options::rate_limiter`. This PR is to provide rate-limiting to auto WAL flush, the one that automatically happen after each user write operation (i.e, `Options::manual_wal_flush == false`), by adding `WriteOptions::rate_limiter_options`. Note that we are NOT rate-limiting WAL flush that do NOT automatically happen after each user write, such as `Options::manual_wal_flush == true + manual FlushWAL()` (rate-limiting multiple WAL flushes), for the benefits of: - being consistent with [ReadOptions::rate_limiter_priority](https://github.com/facebook/rocksdb/blob/7.0.fb/include/rocksdb/options.h#L515) - being able to turn off some WAL flush's rate-limiting but not all (e.g, turn off specific the WAL flush of a critical user write like a service's heartbeat) `WriteOptions::rate_limiter_options` only accept `Env::IO_USER` and `Env::IO_TOTAL` currently due to an implementation constraint. - The constraint is that we currently queue parallel writes (including WAL writes) based on FIFO policy which does not factor rate limiter priority into this layer's scheduling. If we allow lower priorities such as `Env::IO_HIGH/MID/LOW` and such writes specified with lower priorities occurs before ones specified with higher priorities (even just by a tiny bit in arrival time), the former would have blocked the latter, leading to a "priority inversion" issue and contradictory to what we promise for rate-limiting priority. Therefore we only allow `Env::IO_USER` and `Env::IO_TOTAL` right now before improving that scheduling. A pre-requisite to this feature is to support operation-level rate limiting in `WritableFileWriter`, which is also included in this PR. **Summary:** - Renamed test suite `DBRateLimiterTest to DBRateLimiterOnReadTest` for adding a new test suite - Accept `rate_limiter_priority` in `WritableFileWriter`'s private and public write functions - Passed `WriteOptions::rate_limiter_options` to `WritableFileWriter` in the path of automatic WAL flush. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9607 Test Plan: - Added new unit test to verify existing flush/compaction rate-limiting does not break, since `DBTest, RateLimitingTest` is disabled and current db-level rate-limiting tests focus on read only (e.g, `db_rate_limiter_test`, `DBTest2, RateLimitedCompactionReads`). - Added new unit test `DBRateLimiterOnWriteWALTest, AutoWalFlush` - `strace -ftt -e trace=write ./db_bench -benchmarks=fillseq -db=/dev/shm/testdb -rate_limit_auto_wal_flush=1 -rate_limiter_bytes_per_sec=15 -rate_limiter_refill_period_us=1000000 -write_buffer_size=100000000 -disable_auto_compactions=1 -num=100` - verified that WAL flush(i.e, system-call _write_) were chunked into 15 bytes and each _write_ was roughly 1 second apart - verified the chunking disappeared when `-rate_limit_auto_wal_flush=0` - crash test: `python3 tools/db_crashtest.py blackbox --disable_wal=0 --rate_limit_auto_wal_flush=1 --rate_limiter_bytes_per_sec=10485760 --interval=10` killed as normal **Benchmarked on flush/compaction to ensure no performance regression:** - compaction with rate-limiting (see table 1, avg over 1280-run): pre-change: **915635 micros/op**; post-change: **907350 micros/op (improved by 0.106%)** ``` #!/bin/bash TEST_TMPDIR=/dev/shm/testdb START=1 NUM_DATA_ENTRY=8 N=10 rm -f compact_bmk_output.txt compact_bmk_output_2.txt dont_care_output.txt for i in $(eval echo "{$START..$NUM_DATA_ENTRY}") do NUM_RUN=$(($N*(2**($i-1)))) for j in $(eval echo "{$START..$NUM_RUN}") do ./db_bench --benchmarks=fillrandom -db=$TEST_TMPDIR -disable_auto_compactions=1 -write_buffer_size=6710886 > dont_care_output.txt && ./db_bench --benchmarks=compact -use_existing_db=1 -db=$TEST_TMPDIR -level0_file_num_compaction_trigger=1 -rate_limiter_bytes_per_sec=100000000 | egrep 'compact' done > compact_bmk_output.txt && awk -v NUM_RUN=$NUM_RUN '{sum+=$3;sum_sqrt+=$3^2}END{print sum/NUM_RUN, sqrt(sum_sqrt/NUM_RUN-(sum/NUM_RUN)^2)}' compact_bmk_output.txt >> compact_bmk_output_2.txt done ``` - compaction w/o rate-limiting (see table 2, avg over 640-run): pre-change: **822197 micros/op**; post-change: **823148 micros/op (regressed by 0.12%)** ``` Same as above script, except that -rate_limiter_bytes_per_sec=0 ``` - flush with rate-limiting (see table 3, avg over 320-run, run on the [patch]( |
3 years ago |
|
Ezgi Çiçek
|
27d6ef8e60 |
Rename mutable_cf_options to signify explicity copy (#9666)
Summary: Signify explicit copy with comment and better name for variable `mutable_cf_options` Pull Request resolved: https://github.com/facebook/rocksdb/pull/9666 Reviewed By: riversand963 Differential Revision: D34680934 Pulled By: ezgicicek fbshipit-source-id: b64ef18725fe523835d14ceb4b29bcdfe493f8ed |
3 years ago |
|
Jay Zhuang
|
36aec94d85 |
`compression_per_level` should be used for flush and changeable (#9658)
Summary: - Make `compression_per_level` dynamical changeable with `SetOptions`; - Fix a bug that `compression_per_level` is not used for flush; Pull Request resolved: https://github.com/facebook/rocksdb/pull/9658 Test Plan: CI Reviewed By: ajkr Differential Revision: D34700749 Pulled By: jay-zhuang fbshipit-source-id: a23b9dfa7ad03d393c1d71781d19e91de796f49c |
3 years ago |
|
Yanqin Jin
|
659a16d52b |
Fix bug causing incorrect data returned by snapshot read (#9648)
Summary: This bug affects use cases that meet the following conditions - (has only the default column family or disables WAL) and - has at least one event listener - atomic flush is NOT affected. If the above conditions meet, then RocksDB can release the db mutex before picking all the existing memtables to flush. In the meantime, a snapshot can be created and db's sequence number can still be incremented. The upcoming flush will ignore this snapshot. A later read using this snapshot can return incorrect result. To fix this issue, we call the listeners callbacks after picking the memtables so that we avoid creating snapshots during this interval. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9648 Test Plan: make check Reviewed By: ajkr Differential Revision: D34555456 Pulled By: riversand963 fbshipit-source-id: 1438981e9f069a5916686b1a0ad7627f734cf0ee |
3 years ago |
|
Jay Zhuang
|
db8647969d |
Unschedule manual compaction from thread-pool queue (#9625)
Summary: PR https://github.com/facebook/rocksdb/issues/9557 introduced a race condition between manual compaction foreground thread and background compaction thread. This PR adds the ability to really unschedule manual compaction from thread-pool queue by differentiate tag name for manual compaction and other tasks. Also fix an issue that db `close()` didn't cancel the manual compaction thread. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9625 Test Plan: unittest not hang Reviewed By: ajkr Differential Revision: D34410811 Pulled By: jay-zhuang fbshipit-source-id: cb14065eabb8cf1345fa042b5652d4f788c0c40c |
3 years ago |
|
Andrew Kryczka
|
9983eecdfb |
Dedicate cacheline for DB mutex (#9637)
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 |
3 years ago |
|
Hui Xiao
|
87a8b3c8af |
Deflake DBErrorHandlingFSTest.MultiCFWALWriteError (#9496)
Summary: **Context:** As part of https://github.com/facebook/rocksdb/pull/6949, file deletion is disabled for faulty database on the IOError of MANIFEST write/sync and [re-enabled again during `DBImpl::Resume()` if all recovery is completed]( |
3 years ago |
|
Siddhartha Roychowdhury
|
39b0d92153 |
Add record to set WAL compression type if enabled (#9556)
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 |
3 years ago |
|
Andrew Kryczka
|
babe56ddba |
Add rate limiter priority to ReadOptions (#9424)
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 |
3 years ago |
|
Yanqin Jin
|
1cda273dc3 |
Fix a silent data loss for write-committed txn (#9571)
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
|
3 years ago |
|
Jay Zhuang
|
a0c569ee1d |
Cancel manual compaction in thread-pool queue (#9557)
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 |
3 years ago |
|
Hui Xiao
|
443d8ef094 |
Fix PinSelf() read-after-free in DB::GetMergeOperands() (#9507)
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
|
3 years ago |
|
Ezgi Çiçek
|
95d9cb8357 |
Avoid unnecessary copy of sample_slice map (#9551)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9551 Reviewed By: riversand963 Differential Revision: D34169574 Pulled By: ezgicicek fbshipit-source-id: 2e88db59b65bda269917a9b0bed17181a4afd281 |
3 years ago |
|
Hui Xiao
|
c5cd31c12b |
Fix TSAN data race in EventListenerTest.MultiCF (#9528)
Summary:
**Context:**
`EventListenerTest.MultiCF` occasionally failed on TSAN data race as below:
```
WARNING: ThreadSanitizer: data race (pid=2047633)
Read of size 8 at 0x7b6000001440 by main thread:
#0 std::vector<rocksdb::DB*, std::allocator<rocksdb::DB*> >::size() const /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_vector.h:916:40 (listener_test+0x52337c)
https://github.com/facebook/rocksdb/issues/1 rocksdb::EventListenerTest_MultiCF_Test::TestBody() /home/circleci/project/db/listener_test.cc:384:7 (listener_test+0x52337c)
Previous write of size 8 at 0x7b6000001440 by thread T2:
#0 void std::vector<rocksdb::DB*, std::allocator<rocksdb::DB*> >::_M_realloc_insert<rocksdb::DB* const&>(__gnu_cxx::__normal_iterator<rocksdb::DB**, std::vector<rocksdb::DB*, std::allocator<rocksdb::DB*> > >, rocksdb::DB* const&) /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/vector.tcc:503:31 (listener_test+0x550654)
https://github.com/facebook/rocksdb/issues/1 std::vector<rocksdb::DB*, std::allocator<rocksdb::DB*> >::push_back(rocksdb::DB* const&) /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_vector.h:1195:4 (listener_test+0x550654)
https://github.com/facebook/rocksdb/issues/2 rocksdb::TestFlushListener::OnFlushCompleted(rocksdb::DB*, rocksdb::FlushJobInfo const&) /home/circleci/project/db/listener_test.cc:255:18 (listener_test+0x550654)
```
After investigation, it is due to the following:
(1) `ASSERT_OK(Flush(i));` before the read `std::vector::size()` is supposed to be [blocked on `DB::Impl::bg_cv_` for memtable flush to finish](
|
3 years ago |
|
Levi Tamasi
|
320d9a8e8a |
Use a sorted vector instead of a map to store blob file metadata (#9526)
Summary: The patch replaces `std::map` with a sorted `std::vector` for `VersionStorageInfo::blob_files_` and preallocates the space for the `vector` before saving the `BlobFileMetaData` into the new `VersionStorageInfo` in `VersionBuilder::Rep::SaveBlobFilesTo`. These changes reduce the time the DB mutex is held while saving new `Version`s, and using a sorted `vector` also makes lookups faster thanks to better memory locality. In addition, the patch introduces helper methods `VersionStorageInfo::GetBlobFileMetaData` and `VersionStorageInfo::GetBlobFileMetaDataLB` that can be used by clients to perform lookups in the `vector`, and does some general cleanup in the parts of code where blob file metadata are used. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9526 Test Plan: Ran `make check` and the crash test script for a while. Performance was tested using a load-optimized benchmark (`fillseq` with vector memtable, no WAL) and small file sizes so that a significant number of files are produced: ``` numactl --interleave=all ./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/ltamasi-dbbench --wal_dir=/data/ltamasi-dbbench --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 --enable_blob_files=1 --blob_file_size=16777216 --min_blob_size=0 --blob_compression_type=lz4 --enable_blob_garbage_collection=1 --seed=<some value> ``` Final statistics before the patch: ``` Cumulative writes: 0 writes, 700M keys, 0 commit groups, 0.0 writes per commit group, ingest: 284.62 GB, 121.27 MB/s Interval writes: 0 writes, 334K keys, 0 commit groups, 0.0 writes per commit group, ingest: 139.28 MB, 72.46 MB/s ``` With the patch: ``` Cumulative writes: 0 writes, 760M keys, 0 commit groups, 0.0 writes per commit group, ingest: 308.66 GB, 131.52 MB/s Interval writes: 0 writes, 445K keys, 0 commit groups, 0.0 writes per commit group, ingest: 185.35 MB, 93.15 MB/s ``` Total time to complete the benchmark is 2611 seconds with the patch, down from 2986 secs. Reviewed By: riversand963 Differential Revision: D34082728 Pulled By: ltamasi fbshipit-source-id: fc598abf676dce436734d06bb9d2d99a26a004fc |
3 years ago |
|
Akanksha Mahajan
|
9745c68eb1 |
Remove deprecated option new_table_reader_for_compaction_inputs (#9443)
Summary: In RocksDB option new_table_reader_for_compaction_inputs has not effect on Compaction or on the behavior of RocksDB library. Therefore, we are removing it in the upcoming 7.0 release. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9443 Test Plan: CircleCI Reviewed By: ajkr Differential Revision: D33788508 Pulled By: akankshamahajan15 fbshipit-source-id: 324ca6f12bfd019e9bd5e1b0cdac39be5c3cec7d |
3 years ago |
|
Yanqin Jin
|
629e3e1d77 |
Fix spelling in public API (#9490)
Summary: I feel it would be nice if we can fix this spelling error. In `SizeApproximationOptions`, the `include_memtabtles` should be `include_memtables`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9490 Test Plan: make check Reviewed By: hx235 Differential Revision: D33949862 Pulled By: riversand963 fbshipit-source-id: b2be67501b65d4aabb6b8df1bf25eb8d54cc1466 |
3 years ago |
|
Yanqin Jin
|
3122cb4358 |
Revise APIs related to user-defined timestamp (#8946)
Summary: ajkr reminded me that we have a rule of not including per-kv related data in `WriteOptions`. Namely, `WriteOptions` should not include information about "what-to-write", but should just include information about "how-to-write". According to this rule, `WriteOptions::timestamp` (experimental) is clearly a violation. Therefore, this PR removes `WriteOptions::timestamp` for compliance. After the removal, we need to pass timestamp info via another set of APIs. This PR proposes a set of overloaded functions `Put(write_opts, key, value, ts)`, `Delete(write_opts, key, ts)`, and `SingleDelete(write_opts, key, ts)`. Planned to add `Write(write_opts, batch, ts)`, but its complexity made me reconsider doing it in another PR (maybe). For better checking and returning error early, we also add a new set of APIs to `WriteBatch` that take extra `timestamp` information when writing to `WriteBatch`es. These set of APIs in `WriteBatchWithIndex` are currently not supported, and are on our TODO list. Removed `WriteBatch::AssignTimestamps()` and renamed `WriteBatch::AssignTimestamp()` to `WriteBatch::UpdateTimestamps()` since this method require that all keys have space for timestamps allocated already and multiple timestamps can be updated. The constructor of `WriteBatch` now takes a fourth argument `default_cf_ts_sz` which is the timestamp size of the default column family. This will be used to allocate space when calling APIs that do not specify a column family handle. Also, updated `DB::Get()`, `DB::MultiGet()`, `DB::NewIterator()`, `DB::NewIterators()` methods, replacing some assertions about timestamp to returning Status code. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8946 Test Plan: make check ./db_bench -benchmarks=fillseq,fillrandom,readrandom,readseq,deleterandom -user_timestamp_size=8 ./db_stress --user_timestamp_size=8 -nooverwritepercent=0 -test_secondary=0 -secondary_catch_up_one_in=0 -continuous_verification_interval=0 Make sure there is no perf regression by running the following ``` ./db_bench_opt -db=/dev/shm/rocksdb -use_existing_db=0 -level0_stop_writes_trigger=256 -level0_slowdown_writes_trigger=256 -level0_file_num_compaction_trigger=256 -disable_wal=1 -duration=10 -benchmarks=fillrandom ``` Before this PR ``` DB path: [/dev/shm/rocksdb] fillrandom : 1.831 micros/op 546235 ops/sec; 60.4 MB/s ``` After this PR ``` DB path: [/dev/shm/rocksdb] fillrandom : 1.820 micros/op 549404 ops/sec; 60.8 MB/s ``` Reviewed By: ltamasi Differential Revision: D33721359 Pulled By: riversand963 fbshipit-source-id: c131561534272c120ffb80711d42748d21badf09 |
3 years ago |
|
Jay Zhuang
|
980b9ff385 |
Add more micro-benchmark tests (#9436)
Summary: * Add more micro-benchmark tests * Expose an API in DBImpl for waiting for compactions (still not visible to the user) * Add argument name for ribbon_bench * remove benchmark run from CI, as it runs too long. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9436 Test Plan: CI Reviewed By: riversand963 Differential Revision: D33777836 Pulled By: jay-zhuang fbshipit-source-id: c05de3bc082cc05b5d019f00b324e774bf4bbd96 |
3 years ago |
|
Yanqin Jin
|
d10c5c08d3 |
Remove iter_start_seqnum and preserve_deletes (#9430)
Summary: According to https://github.com/facebook/rocksdb/blob/6.27.fb/db/db_impl/db_impl.cc#L2896:L2911 and https://github.com/facebook/rocksdb/blob/6.27.fb/db/db_impl/db_impl_open.cc#L203:L208, we are going to remove `iter_start_seqnum` and `preserve_deletes` starting from RocksDB 7.0 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9430 Test Plan: make check and CI Reviewed By: ajkr Differential Revision: D33753639 Pulled By: riversand963 fbshipit-source-id: c80aab8e8d8fc33e52472fed524ed703d0ffc8b6 |
3 years ago |
|
Yanqin Jin
|
dd203ed604 |
Disallow a combination of options (#9348)
Summary: Disallow `immutable_db_opts.use_direct_io_for_flush_and_compaction == true` and `mutable_db_opts.writable_file_max_buffer_size == 0`, since it causes `WritableFileWriter::Append()` to loop forever and does not make much sense in direct IO. This combination of options itself does not make much sense: asking RocksDB to do direct IO but not allowing RocksDB to allocate a buffer. We should detect this false combination and warn user early, no matter whether the application is running on a platform that supports direct IO or not. In the case of platform **not** supporting direct IO, it's ok if the user learns about this and then finds that direct IO is not supported. One tricky thing: the constructor of `WritableFileWriter` is being used in our unit tests, and it's impossible to return status code from constructor. Since we do not throw, I put an assertion for now. Fortunately, the constructor is not exposed to external applications. Closing https://github.com/facebook/rocksdb/issues/7109 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9348 Test Plan: make check Reviewed By: ajkr Differential Revision: D33371924 Pulled By: riversand963 fbshipit-source-id: 2a3701ab541cee23bffda8a36cdf37b2d235edfa |
3 years ago |
|
Siddhartha Roychowdhury
|
c27ca23644 |
Add option for WAL compression algorithm (#9432)
Summary: Add an option to set the WAL compression algorithm - wal_compression. TODO: WAL compression is not implemented and will only support zstd initially. Will be added in subsequent diffs. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9432 Reviewed By: pdillinger Differential Revision: D33797275 Pulled By: sidroyc fbshipit-source-id: 8db81d9c9cea5e2e4f1445d3aecad8106137b8e7 |
3 years ago |
|
Peter Dillinger
|
8064a3ac31 |
Fix flaky EventListenerTest.DisableBGCompaction (#9400)
Summary: Wasn't able to easily reproduce error, but easy to see a race condition between TestFlushListener::OnFlushCompleted and DBTestBase::Close(), which frees CF handles before closing DB. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9400 Test Plan: CI etc. Reviewed By: riversand963 Differential Revision: D33645134 Pulled By: pdillinger fbshipit-source-id: d0ec914cc43c9e14f53da633876b95b61995138d |
3 years ago |
|
zhuchong0329
|
5f2b661f54 |
FlushMemTable return ok but memtable does not synchronize flush (#8173)
Summary: Fix https://github.com/facebook/rocksdb/issues/8046 : FlushMemTable return ok but memtable does not synchronize flush. The way to fix it is to expose RecoveryError. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8173 Reviewed By: ajkr Differential Revision: D31674552 Pulled By: jay-zhuang fbshipit-source-id: 9d16b69ba12a196bb429332ec8224754de97773d |
3 years ago |
|
Yanqin Jin
|
b2e53ab2d8 |
Add checking for `DB::DestroyColumnFamilyHandle()` (#9347)
Summary: Closing https://github.com/facebook/rocksdb/issues/5006 Calling `DB::DestroyColumnFamilyHandle(column_family)` with `column_family` being the return value of `DB::DefaultColumnFamily()` will return `Status::InvalidArgument()`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9347 Test Plan: make check Reviewed By: akankshamahajan15 Differential Revision: D33369675 Pulled By: riversand963 fbshipit-source-id: a8266a4daddf2b7a773c2dc7f3eb9a4adfb6b6dd |
3 years ago |
|
Andrew Kryczka
|
aa2b3bf675 |
Added `TraceOptions::preserve_write_order` (#9334)
Summary: This option causes trace records to be written in the serialized write thread. That way, the write records in the trace must follow the same order as writes that are logged to WAL and writes that are applied to the DB. By default I left it disabled to match existing behavior. I enabled it in `db_stress`, though, as that use case requires order of write records in trace matches the order in WAL. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9334 Test Plan: - See if below unsynced data loss crash test can run for 24h straight. It used to crash after a few hours when reaching an unlucky trace ordering. ``` DEBUG_LEVEL=0 TEST_TMPDIR=/dev/shm /usr/local/bin/python3 -u tools/db_crashtest.py blackbox --interval=10 --max_key=100000 --write_buffer_size=524288 --target_file_size_base=524288 --max_bytes_for_level_base=2097152 --value_size_mult=33 --sync_fault_injection=1 --test_batches_snapshots=0 --duration=86400 ``` Reviewed By: zhichao-cao Differential Revision: D33301990 Pulled By: ajkr fbshipit-source-id: 82d97559727adb4462a7af69758449c8725b22d3 |
3 years ago |
|
slk
|
2e5f764294 |
Make IncreaseFullHistoryTsLow to a public API (#9221)
Summary: As (https://github.com/facebook/rocksdb/issues/9210) discussed, the **full_history_ts_low** is a member of CompactRangeOptions currently, which means a CF's fullHistoryTsLow is advanced only when users submit a CompactRange request. However, users may want to advance the fllHistoryTsLow without an immediate compact. This merge make IncreaseFullHistoryTsLow to a public API so users can advance each CF's fullHistoryTsLow seperately. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9221 Reviewed By: akankshamahajan15 Differential Revision: D33201106 Pulled By: riversand963 fbshipit-source-id: 9cb1d013ba93260f72e16353e693ffee167b47ee |
3 years ago |
|
Andrew Kryczka
|
538d2365e9 |
Fix race condition in BackupEngineTest.ChangeManifestDuringBackupCreation (#9327)
Summary:
The failure looked like this:
```
utilities/backupable/backupable_db_test.cc:3161: Failure
Value of: db_chroot_env_->FileExists(prev_manifest_path).IsNotFound()
Actual: false
Expected: true
```
The failure could be coerced consistently with the following patch:
```
diff --git a/db/db_impl/db_impl_compaction_flush.cc b/db/db_impl/db_impl_compaction_flush.cc
index 80410f671..637636791 100644
--- a/db/db_impl/db_impl_compaction_flush.cc
+++ b/db/db_impl/db_impl_compaction_flush.cc
@@ -2772,6 +2772,8 @@ void DBImpl::BackgroundCallFlush(Env::Priority thread_pri) {
if (job_context.HaveSomethingToClean() ||
job_context.HaveSomethingToDelete() || !log_buffer.IsEmpty()) {
mutex_.Unlock();
+ bg_cv_.SignalAll();
+ sleep(1);
TEST_SYNC_POINT("DBImpl::BackgroundCallFlush:FilesFound");
// Have to flush the info logs before bg_flush_scheduled_--
// because if bg_flush_scheduled_ becomes 0 and the lock is
```
The cause was a familiar problem, which is manual flush/compaction may
return before files they obsoleted are removed. The solution is just to
wait for "scheduled" work to complete, which includes all phases
including cleanup.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9327
Test Plan:
after this PR, even the above patch to coerce the bug cannot
cause the test to fail.
Reviewed By: riversand963
Differential Revision: D33252208
Pulled By: ajkr
fbshipit-source-id: 720a7eaca58c7247d221911fffe3d5e1dbf581e9
|
3 years ago |
|
mrambacher
|
423538a816 |
Make MemoryAllocator into a Customizable class (#8980)
Summary: - Make MemoryAllocator and its implementations into a Customizable class. - Added a "DefaultMemoryAllocator" which uses new and delete - Added a "CountedMemoryAllocator" that counts the number of allocs and free - Updated the existing tests to use these new allocators - Changed the memkind allocator test into a generic test that can test the various allocators. - Added tests for creating all of the allocators - Added tests to verify/create the JemallocNodumpAllocator using its options. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8980 Reviewed By: zhichao-cao Differential Revision: D32990403 Pulled By: mrambacher fbshipit-source-id: 6fdfe8218c10dd8dfef34344a08201be1fa95c76 |
3 years ago |
|
Peter Dillinger
|
0050a73a4f |
New stable, fixed-length cache keys (#9126)
Summary: This change standardizes on a new 16-byte cache key format for block cache (incl compressed and secondary) and persistent cache (but not table cache and row cache). The goal is a really fast cache key with practically ideal stability and uniqueness properties without external dependencies (e.g. from FileSystem). A fixed key size of 16 bytes should enable future optimizations to the concurrent hash table for block cache, which is a heavy CPU user / bottleneck, but there appears to be measurable performance improvement even with no changes to LRUCache. This change replaces a lot of disjointed and ugly code handling cache keys with calls to a simple, clean new internal API (cache_key.h). (Preserving the old cache key logic under an option would be very ugly and likely negate the performance gain of the new approach. Complete replacement carries some inherent risk, but I think that's acceptable with sufficient analysis and testing.) The scheme for encoding new cache keys is complicated but explained in cache_key.cc. Also: EndianSwapValue is moved to math.h to be next to other bit operations. (Explains some new include "math.h".) ReverseBits operation added and unit tests added to hash_test for both. Fixes https://github.com/facebook/rocksdb/issues/7405 (presuming a root cause) Pull Request resolved: https://github.com/facebook/rocksdb/pull/9126 Test Plan: ### Basic correctness Several tests needed updates to work with the new functionality, mostly because we are no longer relying on filesystem for stable cache keys so table builders & readers need more context info to agree on cache keys. This functionality is so core, a huge number of existing tests exercise the cache key functionality. ### Performance Create db with `TEST_TMPDIR=/dev/shm ./db_bench -bloom_bits=10 -benchmarks=fillrandom -num=3000000 -partition_index_and_filters` And test performance with `TEST_TMPDIR=/dev/shm ./db_bench -readonly -use_existing_db -bloom_bits=10 -benchmarks=readrandom -num=3000000 -duration=30 -cache_index_and_filter_blocks -cache_size=250000 -threads=4` using DEBUG_LEVEL=0 and simultaneous before & after runs. Before ops/sec, avg over 100 runs: 121924 After ops/sec, avg over 100 runs: 125385 (+2.8%) ### Collision probability I have built a tool, ./cache_bench -stress_cache_key to broadly simulate host-wide cache activity over many months, by making some pessimistic simplifying assumptions: * Every generated file has a cache entry for every byte offset in the file (contiguous range of cache keys) * All of every file is cached for its entire lifetime We use a simple table with skewed address assignment and replacement on address collision to simulate files coming & going, with quite a variance (super-Poisson) in ages. Some output with `./cache_bench -stress_cache_key -sck_keep_bits=40`: ``` Total cache or DBs size: 32TiB Writing 925.926 MiB/s or 76.2939TiB/day Multiply by 9.22337e+18 to correct for simulation losses (but still assume whole file cached) ``` These come from default settings of 2.5M files per day of 32 MB each, and `-sck_keep_bits=40` means that to represent a single file, we are only keeping 40 bits of the 128-bit cache key. With file size of 2\*\*25 contiguous keys (pessimistic), our simulation is about 2\*\*(128-40-25) or about 9 billion billion times more prone to collision than reality. More default assumptions, relatively pessimistic: * 100 DBs in same process (doesn't matter much) * Re-open DB in same process (new session ID related to old session ID) on average every 100 files generated * Restart process (all new session IDs unrelated to old) 24 times per day After enough data, we get a result at the end: ``` (keep 40 bits) 17 collisions after 2 x 90 days, est 10.5882 days between (9.76592e+19 corrected) ``` If we believe the (pessimistic) simulation and the mathematical generalization, we would need to run a billion machines all for 97 billion days to expect a cache key collision. To help verify that our generalization ("corrected") is robust, we can make our simulation more precise with `-sck_keep_bits=41` and `42`, which takes more running time to get enough data: ``` (keep 41 bits) 16 collisions after 4 x 90 days, est 22.5 days between (1.03763e+20 corrected) (keep 42 bits) 19 collisions after 10 x 90 days, est 47.3684 days between (1.09224e+20 corrected) ``` The generalized prediction still holds. With the `-sck_randomize` option, we can see that we are beating "random" cache keys (except offsets still non-randomized) by a modest amount (roughly 20x less collision prone than random), which should make us reasonably comfortable even in "degenerate" cases: ``` 197 collisions after 1 x 90 days, est 0.456853 days between (4.21372e+18 corrected) ``` I've run other tests to validate other conditions behave as expected, never behaving "worse than random" unless we start chopping off structured data. Reviewed By: zhichao-cao Differential Revision: D33171746 Pulled By: pdillinger fbshipit-source-id: f16a57e369ed37be5e7e33525ace848d0537c88f |
3 years ago |
|
Yanqin Jin
|
bd513fd075 |
Add commit marker with timestamp (#9266)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9266 This diff adds a new tag `CommitWithTimestamp`. Currently, there is no API to trigger writing this tag to WAL, thus it is unavailable to users. This is an ongoing effort to add user-defined timestamp support to write-committed transactions. This diff also indicates all column families that may potentially participate in the same transaction must either disable timestamp or have the same timestamp format, since `CommitWithTimestamp` tag is followed by a single byte-array denoting the commit timestamp of the transaction. We will enforce this checking in a future diff. We keep this diff small. Reviewed By: ltamasi Differential Revision: D31721350 fbshipit-source-id: e1450811443647feb6ca01adec4c8aaae270ffc6 |
3 years ago |
|
Si Ke
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79f4a04ee3 |
Get DBTest passing Assert Status Checked (#7737)
Summary: Closes https://github.com/facebook/rocksdb/pull/7737 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9231 Reviewed By: hx235 Differential Revision: D32978332 Pulled By: pdillinger fbshipit-source-id: b28900b685d60c668529a90dbaa8e1b357b28f76 |
3 years ago |
|
sdong
|
88875df821 |
File temperature information should be preserved when restart the DB (#9242)
Summary: Fix a bug that causes file temperature not preserved after DB is restarted, or options.max_manifest_file_size is hit. Also, pass temperature information to NewRandomAccessFile() to allow users to hack a solution where they don't preserve tiering information. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9242 Test Plan: Add a unit test that would fail without the fix. Reviewed By: jay-zhuang Differential Revision: D32818150 fbshipit-source-id: 36aa3f148c60107f7b8e9d65b63b039f9e1a1eec |
3 years ago |
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lgqss
|
77c7085594 |
MemTableList::TrimHistory now use allocated bytes (#9020)
Summary: Fix a bug when both max_write_buffer_size_to_maintain and max_write_buffer_number_to_maintain are 0. The bug was introduced in 6.5.0 and https://github.com/facebook/rocksdb/issues/5022. Fix https://github.com/facebook/rocksdb/issues/8371 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9020 Reviewed By: pdillinger Differential Revision: D32767084 Pulled By: ajkr fbshipit-source-id: c401ee6e2557230e892d0fe8abb4966cbd18e85f |
3 years ago |
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Peter Dillinger
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2a67d475f1 |
Fix bug affecting GetSortedWalFiles, Backups, Checkpoint (#9208)
Summary: Saw error like this: `Backup failed -- IO error: No such file or directory: While opening a file for sequentially reading: /dev/shm/rocksdb/rocksdb_crashtest_blackbox/004426.log: No such file or directory` Unfortunately, GetSortedWalFiles (used by Backups, Checkpoint, etc.) relies on no file deletions happening while its operating, which means not only disabling (more) deletions, but ensuring any pending deletions are completed. Two fixes related to this: * There was a gap in several places between decrementing pending_purge_obsolete_files_ and incrementing bg_purge_scheduled_ where the db mutex would be released and GetSortedWalFiles (and others) could get false information that no deletions are pending. * The fix to https://github.com/facebook/rocksdb/issues/8591 (disabling deletions in GetSortedWalFiles) seems incomplete because it doesn't prevent pending deletions from occuring during the operation (if deletions not already disabled, the case that was to be fixed by the change). Pull Request resolved: https://github.com/facebook/rocksdb/pull/9208 Test Plan: existing tests (it's hard to write a test for interleavings that are now excluded - this is what stress test is for) Reviewed By: ajkr Differential Revision: D32630675 Pulled By: pdillinger fbshipit-source-id: a121e3da648de130cd24d44c524232f4eb22f178 |
3 years ago |
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Jay Zhuang
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6cde8d2190 |
Deprecating `iter_start_seqnum` and `preserve_deletes` (#9091)
Summary: `ReadOptions::iter_start_seqnum` and `DBOptions::preserve_deletes` are deprecated, please try using user defined timestamp feature instead. The feature is used to support differential snapshots, but not well maintained (https://github.com/facebook/rocksdb/issues/6837, https://github.com/facebook/rocksdb/issues/8472) and the interface is not user friendly which returns an internal key from the iterator. The user defined timestamp feature is a more flexible feature to support similar usecase, please switch to that if you have such usecase. The deprecated feature will be removed in a future release. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9091 Test Plan: check LOG Fix https://github.com/facebook/rocksdb/issues/9090 Reviewed By: ajkr Differential Revision: D32071750 Pulled By: jay-zhuang fbshipit-source-id: b882c4668dd1bf26ce03c4c192f1bba584bf6104 |
3 years ago |
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Yanqin Jin
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1e8322c0f5 |
Fix a bug in FlushJob picking more memtables beyond synced WALs (#9142)
Summary: After RocksDB 6.19 and before this PR, RocksDB FlushJob may pick more memtables to flush beyond synced WALs. This can be problematic if there are multiple column families, since it can prematurely advance the flushed column family's log_number. Should subsequent attempts fail to sync the latest WALs and the database goes through a recovery, it may detect corrupted WAL number below the flushed column family's log number and complain about column family inconsistency. To fix, we record the maximum memtable ID of the column family being flushed. Then we call SyncClosedLogs() so that all closed WALs at the time when memtable ID is recorded will be synced. I also disabled a unit test temporarily due to reasons described in https://github.com/facebook/rocksdb/issues/9151 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9142 Test Plan: make check Reviewed By: ajkr Differential Revision: D32299956 Pulled By: riversand963 fbshipit-source-id: 0da75888177d91905cf8c9d00605b73afb5970a7 |
3 years ago |
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Andrew Kryczka
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8cf4294e25 |
Adhere to per-DB concurrency limit when bottom-pri compactions exist (#9179)
Summary: - Fixed bug where bottom-pri manual compactions were counting towards `bg_compaction_scheduled_` instead of `bg_bottom_compaction_scheduled_`. It seems to have no negative effect. - Fixed bug where automatic compaction scheduling did not consider `bg_bottom_compaction_scheduled_`. Now automatic compactions cannot be scheduled that exceed the per-DB compaction concurrency limit (`max_compactions`) when some existing compactions are bottommost. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9179 Test Plan: new unit test for manual/automatic. Also verified the existing automatic/automatic test ("ConcurrentBottomPriLowPriCompactions") hanged until changing it to explicitly enable concurrency. Reviewed By: riversand963 Differential Revision: D32488048 Pulled By: ajkr fbshipit-source-id: 20c4c0693678e81e43f85ed3cc3402fcf26e3310 |
3 years ago |
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Yanqin Jin
|
2035798834 |
Update TransactionUtil::CheckKeyForConflict to also use timestamps (#9162)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9162 Existing TransactionUtil::CheckKeyForConflict() performs only seq-based conflict checking. If user-defined timestamp is enabled, it should perform conflict checking based on timestamps too. Update TransactionUtil::CheckKey-related methods to verify the timestamp of the latest version of a key is smaller than the read timestamp. Note that CheckKeysForConflict() is not updated since it's used only by optimistic transaction, and we do not plan to update it in this upcoming batch of diffs. Existing GetLatestSequenceForKey() returns the sequence of the latest version of a specific user key. Since we support user-defined timestamp, we need to update this method to also return the timestamp (if enabled) of the latest version of the key. This will be needed for snapshot validation. Reviewed By: ltamasi Differential Revision: D31567960 fbshipit-source-id: 2e4a14aed267435a9aa91bc632d2411c01946d44 |
3 years ago |
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slk
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937fbcbddc |
Track per-SST user-defined timestamp information in MANIFEST (#9092)
Summary: Track per-SST user-defined timestamp information in MANIFEST https://github.com/facebook/rocksdb/issues/8957 Rockdb has supported user-defined timestamp feature. Application can specify a timestamp when writing each k-v pair. When data flush from memory to disk file called SST files, file creation activity will commit to MANIFEST. This commit is for tracking timestamp info in the MANIFEST for each file. The changes involved are as follows: 1) Track max/min timestamp in FileMetaData, and fix invoved codes. 2) Add NewFileCustomTag::kMinTimestamp and NewFileCustomTag::kMinTimestamp in NewFileCustomTag ( in the kNewFile4 part ), and support invoved codes such as VersionEdit Encode and Decode etc. 3) Add unit test code for VersionEdit EncodeDecodeNewFile4, and fix invoved test codes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9092 Reviewed By: ajkr, akankshamahajan15 Differential Revision: D32252323 Pulled By: riversand963 fbshipit-source-id: d2642898d6e3ad1fef0eb866b98045408bd4e162 |
3 years ago |
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Jay Zhuang
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29102641dd |
Skip directory fsync for filesystem btrfs (#8903)
Summary: Directory fsync might be expensive on btrfs and it may not be needed. Here are 4 directory fsync cases: 1. creating a new file: dir-fsync is not needed on btrfs, as long as the new file itself is synced. 2. renaming a file: dir-fsync is not needed if the renamed file is synced. So an API `FsyncAfterFileRename(filename, ...)` is provided to sync the file on btrfs. By default, it just calls dir-fsync. 3. deleting files: dir-fsync is forced by set `IOOptions.force_dir_fsync = true` 4. renaming multiple files (like backup and checkpoint): dir-fsync is forced, the same as above. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8903 Test Plan: run tests on btrfs and non btrfs Reviewed By: ajkr Differential Revision: D30885059 Pulled By: jay-zhuang fbshipit-source-id: dd2730b31580b0bcaedffc318a762d7dbf25de4a |
3 years ago |
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leipeng
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230c98f3ce |
fix histogram NUM_FILES_IN_SINGLE_COMPACTION (#9026)
Summary: currently histogram `NUM_FILES_IN_SINGLE_COMPACTION` just counted files in first level of compaction input, this fix counts files in all levels of compaction input. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9026 Reviewed By: ajkr Differential Revision: D31668241 Pulled By: jay-zhuang fbshipit-source-id: c02f6c4a5df9fbf0b7510036594811152e8738af |
3 years ago |
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leipeng
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2b70224f82 |
remove bad extra RecordTick(stats_, WRITE_WITH_WAL) (#9064)
Summary: This PR fix wrong ticker `WRITE_WITH_WAL`. `RecordTick(WRITE_WITH_WAL)` will be called later in `WriteToWAL` and `ConcurrentWriteToWAL`. Fixes: 1. Delete these two extra `RecordTick(WRITE_WITH_WAL)` 2. Fix corresponding test case Pull Request resolved: https://github.com/facebook/rocksdb/pull/9064 Reviewed By: ajkr Differential Revision: D31944459 Pulled By: riversand963 fbshipit-source-id: f1aa8d2a4320456bc357bc5b0902032f7dcad086 |
3 years ago |
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Andrew Kryczka
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f24c39ab3d |
Prevent corruption with parallel manual compactions and `change_level == true` (#9077)
Summary: The bug can impact the following scenario. There must be two `CompactRange()`s, call them A and B. Compaction A must have `change_level=true`. Compactions A and B must run in parallel, and new data must be added while they run as well. Now, on to the details of the race condition. Compaction A must reach the refitting phase while B's next step is to trivial move new data (i.e., data that has been inserted behind A) down to the same level that A's refit targets (`CompactRangeOptions::target_level`). B must be unregistered (i.e., has not yet called `AddManualCompaction()` for the current `RunManualCompaction()`) while A invokes `DisableManualCompaction()`s to prepare for refitting. In the old code, B could still proceed to register a manual compaction, while A had disabled manual compaction. The next part of the race condition is B picks and schedules a trivial move while A has released the lock in refitting phase in order to persist the LSM state change (i.e., the log phase of `LogAndApply()`). That way, B does not see the refitted data when picking a trivial-move compaction. So it is susceptible to picking one that overlaps. Finally, B executes the picked trivial-move compaction. Trivial-move compactions are special in that they never check whether manual compaction is disabled. So the picked compaction causing overlap ends up being applied, leading to LSM corruption if `force_consistency_checks=false`, or entering read-only mode with `Status::Corruption` if `force_consistency_checks=true` (the default). The fix is just to prevent B from registering itself in `RunManualCompaction()` while manual compactions are disabled, consequently preventing any trivial move or other compaction from being picked/scheduled. Thanks to siying for finding the bug. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9077 Test Plan: The test does not go all the way in exposing the bug because it requires a compaction to be picked/scheduled while logging LSM state change for RefitLevel(). But the fix is to make such a compaction not picked/scheduled in the first place, so any repro of that scenario would end up hanging RefitLevel() logging. So instead I just verified no such compaction is registered in the scenario where `RefitLevel()` disables manual compactions. Reviewed By: siying Differential Revision: D31921908 Pulled By: ajkr fbshipit-source-id: 9bb5d0e847ad428211227f40830c685c209fbecb |
3 years ago |
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Yanqin Jin
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f72fd58565 |
Fix atomic flush waiting forever for MANIFEST write (#9034)
Summary: In atomic flush, concurrent background flush threads will commit to the MANIFEST one by one, in the order of the IDs of their picked memtables for all included column families. Each time, a background flush thread decides whether to wait based on two criteria: - Is db stopped? If so, don't wait. - Am I the one to commit the currently earliest memtable? If so, don't wait and ready to go. When atomic flush was implemented, error writing to or syncing the MANIFEST would cause the db to be stopped. Therefore, this background thread does not have to check for the background error while waiting. If there has been such an error, `DBStopped()` would have been true, and this thread will **not** wait forever. After we improved error handling, RocksDB may map an IOError while writing to MANIFEST to a soft error, if there is no WAL. This requires the background threads to check for background error while waiting. Otherwise, a background flush thread may wait forever. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9034 Test Plan: make check Reviewed By: zhichao-cao Differential Revision: D31639225 Pulled By: riversand963 fbshipit-source-id: e9ab07c4d8f2eade238adeefe3e42dd9a5a3ebbd |
3 years ago |
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leipeng
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0a73ada7b5 |
remove unused local obj and simpilify comple code (#9052)
Summary: This PR does not change code sematics, it just changes for: 1. local obj `nonmem_w` and `lfile` are unused 2. null check for `delete ptr` is unnecessary 3. use `unique_ptr::reset` instead of `release` + `delete` Pull Request resolved: https://github.com/facebook/rocksdb/pull/9052 Reviewed By: zhichao-cao Differential Revision: D31801661 Pulled By: anand1976 fbshipit-source-id: 16a77d45da8c8833bf5bf3bce546bb3711b335df |
3 years ago |
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leipeng
|
0c53b41856 |
db_impl_write.cc: use stats_ instead of immutable_db_options_.stats (#9053)
Summary: This PR has no semantic changes, just to make code shorter. `stats_` has value same with `immutable_db_options_.stats`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9053 Reviewed By: zhichao-cao Differential Revision: D31801603 Pulled By: anand1976 fbshipit-source-id: cbd8fe478d3e90ae078ace49b4f2eb9bb028ccf6 |
3 years ago |
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Peter Dillinger
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ad5325a736 |
Experimental support for SST unique IDs (#8990)
Summary: * New public header unique_id.h and function GetUniqueIdFromTableProperties which computes a universally unique identifier based on table properties of table files from recent RocksDB versions. * Generation of DB session IDs is refactored so that they are guaranteed unique in the lifetime of a process running RocksDB. (SemiStructuredUniqueIdGen, new test included.) Along with file numbers, this enables SST unique IDs to be guaranteed unique among SSTs generated in a single process, and "better than random" between processes. See https://github.com/pdillinger/unique_id * In addition to public API producing 'external' unique IDs, there is a function for producing 'internal' unique IDs, with functions for converting between the two. In short, the external ID is "safe" for things people might do with it, and the internal ID enables more "power user" features for the future. Specifically, the external ID goes through a hashing layer so that any subset of bits in the external ID can be used as a hash of the full ID, while also preserving uniqueness guarantees in the first 128 bits (bijective both on first 128 bits and on full 192 bits). Intended follow-up: * Use the internal unique IDs in cache keys. (Avoid conflicts with https://github.com/facebook/rocksdb/issues/8912) (The file offset can be XORed into the third 64-bit value of the unique ID.) * Publish the external unique IDs in FileStorageInfo (https://github.com/facebook/rocksdb/issues/8968) Pull Request resolved: https://github.com/facebook/rocksdb/pull/8990 Test Plan: Unit tests added, and checking of unique ids in stress test. NOTE in stress test we do not generate nearly enough files to thoroughly stress uniqueness, but the test trims off pieces of the ID to check for uniqueness so that we can infer (with some assumptions) stronger properties in the aggregate. Reviewed By: zhichao-cao, mrambacher Differential Revision: D31582865 Pulled By: pdillinger fbshipit-source-id: 1f620c4c86af9abe2a8d177b9ccf2ad2b9f48243 |
3 years ago |