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128 Commits (94329ae4ecfcf6a83cef3f06ba07eae191d2507b)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Jay Zhuang
|
5864900cf4 |
Get current LogFileNumberSize the same as log_writer (#10086)
Summary: `db_impl.alive_log_files_` is used to track the WAL size in `db_impl.logs_`. Get the `LogFileNumberSize` obj in `alive_log_files_` the same time as `log_writer` to keep them consistent. For this issue, it's not safe to do `deque::reverse_iterator::operator*` and `deque::pop_front()` concurrently, so remove the tail cache. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10086 Test Plan: ``` # on Windows gtest-parallel ./db_test --gtest_filter=DBTest.FileCreationRandomFailure -r 1000 -w 100 ``` Reviewed By: riversand963 Differential Revision: D36822373 Pulled By: jay-zhuang fbshipit-source-id: 5e738051dfc7bcf6a15d85ba25e6365df6b6a6af |
2 years ago |
|
Akanksha Mahajan
|
d04df2752a |
Persist the new MANIFEST after successfully syncing the new WAL during recovery (#9922)
Summary: In case of non-TransactionDB and avoid_flush_during_recovery = true, RocksDB won't flush the data from WAL to L0 for all column families if possible. As a result, not all column families can increase their log_numbers, and min_log_number_to_keep won't change. For transaction DB (.allow_2pc), even with the flush, there may be old WAL files that it must not delete because they can contain data of uncommitted transactions and min_log_number_to_keep won't change. If we persist a new MANIFEST with advanced log_numbers for some column families, then during a second crash after persisting the MANIFEST, RocksDB will see some column families' log_numbers larger than the corrupted wal, and the "column family inconsistency" error will be hit, causing recovery to fail. As a solution, RocksDB will persist the new MANIFEST after successfully syncing the new WAL. If a future recovery starts from the new MANIFEST, then it means the new WAL is successfully synced. Due to the sentinel empty write batch at the beginning, kPointInTimeRecovery of WAL is guaranteed to go after this point. If future recovery starts from the old MANIFEST, it means the writing the new MANIFEST failed. We won't have the "SST ahead of WAL" error. Currently, RocksDB DB::Open() may creates and writes to two new MANIFEST files even before recovery succeeds. This PR buffers the edits in a structure and writes to a new MANIFEST after recovery is successful Pull Request resolved: https://github.com/facebook/rocksdb/pull/9922 Test Plan: 1. Update unit tests to fail without this change 2. make crast_test -j Branch with unit test and no fix https://github.com/facebook/rocksdb/pull/9942 to keep track of unit test (without fix) Reviewed By: riversand963 Differential Revision: D36043701 Pulled By: akankshamahajan15 fbshipit-source-id: 5760970db0a0920fb73d3c054a4155733500acd9 |
2 years ago |
|
Yanqin Jin
|
7c8c803938 |
Remove unused variable `single_column_family_mode_` (#10078)
Summary: This variable is actually not being used for anything meaningful, thus remove it. This can make https://github.com/facebook/rocksdb/issues/7516 slightly simpler by reducing the amount of state that must be made lock-free. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10078 Test Plan: make check Reviewed By: ajkr Differential Revision: D36779817 Pulled By: riversand963 fbshipit-source-id: ffb0d9ad6149616917ae5e02bb28102cb90fc406 |
2 years ago |
|
Yanqin Jin
|
514f0b0937 |
Fail DB::Open() if logger cannot be created (#9984)
Summary:
For regular db instance and secondary instance, we return error and refuse to open DB if Logger creation fails.
Our current code allows it, but it is really difficult to debug because
there will be no LOG files. The same for OPTIONS file, which will be explored in another PR.
Furthermore, Arena::AllocateAligned(size_t bytes, size_t huge_page_size, Logger* logger) has an
assertion as the following:
```cpp
#ifdef MAP_HUGETLB
if (huge_page_size > 0 && bytes > 0) {
assert(logger != nullptr);
}
#endif
```
It can be removed.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9984
Test Plan: make check
Reviewed By: jay-zhuang
Differential Revision: D36347754
Pulled By: riversand963
fbshipit-source-id: 529798c0511d2eaa2f0fd40cf7e61c4cbc6bc57e
|
2 years ago |
|
Gang Liao
|
e228515740 |
Pass the size of blob files to SstFileManager during DB open (#10062)
Summary: RocksDB uses the (no longer aptly named) SST file manager (see https://github.com/facebook/rocksdb/wiki/Managing-Disk-Space-Utilization) to track and potentially limit the space used by SST and blob files (as well as to rate-limit the deletion of these data files). The SST file manager tracks the SST and blob file sizes in an in-memory hash map, which has to be rebuilt during DB open. File sizes can be generally obtained by querying the file system; however, there is a performance optimization possibility here since the sizes of SST and blob files are also tracked in the RocksDB MANIFEST, so we can simply pass the file sizes stored there instead of consulting the file system for each file. Currently, this optimization is only implemented for SST files; we would like to extend it to blob files as well. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10062 Test Plan: Add unit tests for the change to the test suite ltamasi riversand963 akankshamahajan15 Reviewed By: ltamasi Differential Revision: D36726621 Pulled By: gangliao fbshipit-source-id: 4010dc46ef7306142f1c2e0d1c3bf75b196ef82a |
2 years ago |
|
Jay Zhuang
|
c6d326d3d7 |
Track SST unique id in MANIFEST and verify (#9990)
Summary: Start tracking SST unique id in MANIFEST, which is used to verify with SST properties to make sure the SST file is not overwritten or misplaced. A DB option `try_verify_sst_unique_id` is introduced to enable/disable the verification, if enabled, it opens all SST files during DB-open to read the unique_id from table properties (default is false), so it's recommended to use it with `max_open_files = -1` to pre-open the files. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9990 Test Plan: unittests, format-compatible test, mini-crash Reviewed By: anand1976 Differential Revision: D36381863 Pulled By: jay-zhuang fbshipit-source-id: 89ea2eb6b35ed3e80ead9c724eb096083eaba63f |
3 years ago |
|
Akanksha Mahajan
|
6442a62e46 |
Update WAL corruption test so that it fails without fix (#9942)
Summary: In case of non-TransactionDB and avoid_flush_during_recovery = true, RocksDB won't flush the data from WAL to L0 for all column families if possible. As a result, not all column families can increase their log_numbers, and min_log_number_to_keep won't change. For transaction DB (.allow_2pc), even with the flush, there may be old WAL files that it must not delete because they can contain data of uncommitted transactions and min_log_number_to_keep won't change. If we persist a new MANIFEST with advanced log_numbers for some column families, then during a second crash after persisting the MANIFEST, RocksDB will see some column families' log_numbers larger than the corrupted WAL, and the "column family inconsistency" error will be hit, causing recovery to fail. This PR update unit tests to emulate the errors and tests are failing without a fix. Error: ``` [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/0 db/corruption_test.cc:1190: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF test_cf [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/0, where GetParam() = (true, false) (91 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/1 db/corruption_test.cc:1190: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF test_cf [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/1, where GetParam() = (false, false) (92 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/2 db/corruption_test.cc:1190: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF test_cf [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/2, where GetParam() = (true, true) (95 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/3 db/corruption_test.cc:1190: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF test_cf [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecovery/3, where GetParam() = (false, true) (92 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/0 db/corruption_test.cc:1354: Failure TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/0, where GetParam() = (true, false) (94 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/1 db/corruption_test.cc:1354: Failure TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/1, where GetParam() = (false, false) (97 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/2 db/corruption_test.cc:1354: Failure TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/2, where GetParam() = (true, true) (94 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/3 db/corruption_test.cc:1354: Failure TransactionDB::Open(options, txn_db_opts, dbname_, cf_descs, &handles, &txn_db) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.TxnDbCrashDuringRecovery/3, where GetParam() = (false, true) (91 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/0 db/corruption_test.cc:1483: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/0, where GetParam() = (true, false) (93 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/1 db/corruption_test.cc:1483: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/1, where GetParam() = (false, false) (94 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/2 db/corruption_test.cc:1483: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/2, where GetParam() = (true, true) (90 ms) [ RUN ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/3 db/corruption_test.cc:1483: Failure DB::Open(options, dbname_, cf_descs, &handles, &db_) Corruption: SST file is ahead of WALs in CF default [ FAILED ] CorruptionTest/CrashDuringRecoveryWithCorruptionTest.CrashDuringRecoveryWithFlush/3, where GetParam() = (false, true) (93 ms) [----------] 12 tests from CorruptionTest/CrashDuringRecoveryWithCorruptionTest (1116 ms total) ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/9942 Test Plan: Not needed Reviewed By: riversand963 Differential Revision: D36324112 Pulled By: akankshamahajan15 fbshipit-source-id: cab2075ac4ebe48f5ef93a6ea162558aa4fc334d |
3 years ago |
|
sdong
|
736a7b5433 |
Remove own ToString() (#9955)
Summary: ToString() is created as some platform doesn't support std::to_string(). However, we've already used std::to_string() by mistake for 16 months (in db/db_info_dumper.cc). This commit just remove ToString(). Pull Request resolved: https://github.com/facebook/rocksdb/pull/9955 Test Plan: Watch CI tests Reviewed By: riversand963 Differential Revision: D36176799 fbshipit-source-id: bdb6dcd0e3a3ab96a1ac810f5d0188f684064471 |
3 years ago |
|
Anvesh Komuravelli
|
aafb377bb5 |
Update protection info on recovered logs data (#9875)
Summary: Update protection info on recovered logs data Pull Request resolved: https://github.com/facebook/rocksdb/pull/9875 Test Plan: - Benchmark setup: `TEST_TMPDIR=/dev/shm/100MB_WAL_DB/ ./db_bench -benchmarks=fillrandom -write_buffer_size=1048576000` - Benchmark command: `TEST_TMPDIR=/dev/shm/100MB_WAL_DB/ /usr/bin/time ./db_bench -use_existing_db=true -benchmarks=overwrite -write_buffer_size=1048576000 -writes=1 -report_open_timing=true` - Results before this PR ``` OpenDb: 2350.14 milliseconds OpenDb: 2296.94 milliseconds OpenDb: 2184.29 milliseconds OpenDb: 2167.59 milliseconds OpenDb: 2231.24 milliseconds OpenDb: 2109.57 milliseconds OpenDb: 2197.71 milliseconds OpenDb: 2120.8 milliseconds OpenDb: 2148.12 milliseconds OpenDb: 2207.95 milliseconds ``` - Results after this PR ``` OpenDb: 2424.52 milliseconds OpenDb: 2359.84 milliseconds OpenDb: 2317.68 milliseconds OpenDb: 2339.4 milliseconds OpenDb: 2325.36 milliseconds OpenDb: 2321.06 milliseconds OpenDb: 2353.98 milliseconds OpenDb: 2344.64 milliseconds OpenDb: 2384.09 milliseconds OpenDb: 2428.58 milliseconds ``` Mean regressed 7.2% (2201.4 -> 2359.9) Reviewed By: ajkr Differential Revision: D36012787 Pulled By: akomurav fbshipit-source-id: d2aba09f29c6beb2fd0fe8e1e359be910b4ef02a |
3 years ago |
|
Andrew Kryczka
|
c5d367f472 |
Revert open logic changes in #9634 (#9906)
Summary: Left HISTORY.md and unit tests. Added a new unit test to repro the corruption scenario that this PR fixes, and HISTORY.md line for that. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9906 Reviewed By: riversand963 Differential Revision: D35940093 Pulled By: ajkr fbshipit-source-id: 9816f99e1ce405ba36f316beb4f6378c37c8c86b |
3 years ago |
|
Yanqin Jin
|
0bd4dcde6b |
CompactionIterator sees consistent view of which keys are committed (#9830)
Summary:
**This PR does not affect the functionality of `DB` and write-committed transactions.**
`CompactionIterator` uses `KeyCommitted(seq)` to determine if a key in the database is committed.
As the name 'write-committed' implies, if write-committed policy is used, a key exists in the database only if
it is committed. In fact, the implementation of `KeyCommitted()` is as follows:
```
inline bool KeyCommitted(SequenceNumber seq) {
// For non-txn-db and write-committed, snapshot_checker_ is always nullptr.
return snapshot_checker_ == nullptr ||
snapshot_checker_->CheckInSnapshot(seq, kMaxSequence) == SnapshotCheckerResult::kInSnapshot;
}
```
With that being said, we focus on write-prepared/write-unprepared transactions.
A few notes:
- A key can exist in the db even if it's uncommitted. Therefore, we rely on `snapshot_checker_` to determine data visibility. We also require that all writes go through transaction API instead of the raw `WriteBatch` + `Write`, thus at most one uncommitted version of one user key can exist in the database.
- `CompactionIterator` outputs a key as long as the key is uncommitted.
Due to the above reasons, it is possible that `CompactionIterator` decides to output an uncommitted key without
doing further checks on the key (`NextFromInput()`). By the time the key is being prepared for output, the key becomes
committed because the `snapshot_checker_(seq, kMaxSequence)` becomes true in the implementation of `KeyCommitted()`.
Then `CompactionIterator` will try to zero its sequence number and hit assertion error if the key is a tombstone.
To fix this issue, we should make the `CompactionIterator` see a consistent view of the input keys. Note that
for write-prepared/write-unprepared, the background flush/compaction jobs already take a "job snapshot" before starting
processing keys. The job snapshot is released only after the entire flush/compaction finishes. We can use this snapshot
to determine whether a key is committed or not with minor change to `KeyCommitted()`.
```
inline bool KeyCommitted(SequenceNumber sequence) {
// For non-txn-db and write-committed, snapshot_checker_ is always nullptr.
return snapshot_checker_ == nullptr ||
snapshot_checker_->CheckInSnapshot(sequence, job_snapshot_) ==
SnapshotCheckerResult::kInSnapshot;
}
```
As a result, whether a key is committed or not will remain a constant throughout compaction, causing no trouble
for `CompactionIterator`s assertions.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9830
Test Plan: make check
Reviewed By: ltamasi
Differential Revision: D35561162
Pulled By: riversand963
fbshipit-source-id: 0e00d200c195240341cfe6d34cbc86798b315b9f
|
3 years ago |
|
Akanksha Mahajan
|
ae82d91492 |
Remove corrupted WAL files in kPointRecoveryMode with avoid_flush_duing_recovery set true (#9634)
Summary: 1) In case of non-TransactionDB and avoid_flush_during_recovery = true, RocksDB won't flush the data from WAL to L0 for all column families if possible. As a result, not all column families can increase their log_numbers, and min_log_number_to_keep won't change. 2) For transaction DB (.allow_2pc), even with the flush, there may be old WAL files that it must not delete because they can contain data of uncommitted transactions and min_log_number_to_keep won't change. If we persist a new MANIFEST with advanced log_numbers for some column families, then during a second crash after persisting the MANIFEST, RocksDB will see some column families' log_numbers larger than the corrupted wal, and the "column family inconsistency" error will be hit, causing recovery to fail. As a solution, 1. the corrupted WALs whose numbers are larger than the corrupted wal and smaller than the new WAL will be moved to archive folder. 2. Currently, RocksDB DB::Open() may creates and writes to two new MANIFEST files even before recovery succeeds. This PR buffers the edits in a structure and writes to a new MANIFEST after recovery is successful Pull Request resolved: https://github.com/facebook/rocksdb/pull/9634 Test Plan: 1. Added new unit tests 2. make crast_test -j Reviewed By: riversand963 Differential Revision: D34463666 Pulled By: akankshamahajan15 fbshipit-source-id: e233d3af0ed4e2028ca0cf051e5a334a0fdc9d19 |
3 years ago |
|
sdong
|
bbcf7b192c |
Fix DB::Open() error logging (#9784)
Summary: Right now we log a wrong error when DB::Open() fails. Fix it. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9784 Test Plan: CI runs should pass Reviewed By: ajkr, riversand963 Differential Revision: D35290203 fbshipit-source-id: ffc640afa27f6b0a2382ee153dc43f28d9e242be |
3 years ago |
|
Yanqin Jin
|
e0c84aa0dc |
Fix a race condition in WAL tracking causing DB open failure (#9715)
Summary: There is a race condition if WAL tracking in the MANIFEST is enabled in a database that disables 2PC. The race condition is between two background flush threads trying to install flush results to the MANIFEST. Consider an example database with two column families: "default" (cfd0) and "cf1" (cfd1). Initially, both column families have one mutable (active) memtable whose data backed by 6.log. 1. Trigger a manual flush for "cf1", creating a 7.log 2. Insert another key to "default", and trigger flush for "default", creating 8.log 3. BgFlushThread1 finishes writing 9.sst 4. BgFlushThread2 finishes writing 10.sst ``` Time BgFlushThread1 BgFlushThread2 | mutex_.Lock() | precompute min_wal_to_keep as 6 | mutex_.Unlock() | mutex_.Lock() | precompute min_wal_to_keep as 6 | join MANIFEST write queue and mutex_.Unlock() | write to MANIFEST | mutex_.Lock() | cfd1->log_number = 7 | Signal bg_flush_2 and mutex_.Unlock() | wake up and mutex_.Lock() | cfd0->log_number = 8 | FindObsoleteFiles() with job_context->log_number == 7 | mutex_.Unlock() | PurgeObsoleteFiles() deletes 6.log V ``` As shown in the above, BgFlushThread2 thinks that the min wal to keep is 6.log because "cf1" has unflushed data in 6.log (cf1.log_number=6). Similarly, BgThread1 thinks that min wal to keep is also 6.log because "default" has unflushed data (default.log_number=6). No WAL deletion will be written to MANIFEST because 6 is equal to `versions_->wals_.min_wal_number_to_keep`, due to https://github.com/facebook/rocksdb/blob/7.1.fb/db/memtable_list.cc#L513:L514. The bg flush thread that finishes last will perform file purging. `job_context.log_number` will be evaluated as 7, i.e. the min wal that contains unflushed data, causing 6.log to be deleted. However, MANIFEST thinks 6.log should still exist. If you close the db at this point, you won't be able to re-open it if `track_and_verify_wal_in_manifest` is true. We must handle the case of multiple bg flush threads, and it is difficult for one bg flush thread to know the correct min wal number until the other bg flush threads have finished committing to the manifest and updated the `cfd::log_number`. To fix this issue, we rename an existing variable `min_log_number_to_keep_2pc` to `min_log_number_to_keep`, and use it to track WAL file deletion in non-2pc mode as well. This variable is updated only 1) during recovery with mutex held, or 2) in the MANIFEST write thread. `min_log_number_to_keep` means RocksDB will delete WALs below it, although there may be WALs above it which are also obsolete. Formally, we will have [min_wal_to_keep, max_obsolete_wal]. During recovery, we make sure that only WALs above max_obsolete_wal are checked and added back to `alive_log_files_`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9715 Test Plan: ``` make check ``` Also ran stress test below (with asan) to make sure it completes successfully. ``` TEST_TMPDIR=/dev/shm/rocksdb OPT=-g ASAN_OPTIONS=disable_coredump=0 \ CRASH_TEST_EXT_ARGS=--compression_type=zstd SKIP_FORMAT_BUCK_CHECKS=1 \ make J=52 -j52 blackbox_asan_crash_test ``` Reviewed By: ltamasi Differential Revision: D34984412 Pulled By: riversand963 fbshipit-source-id: c7b21a8d84751bb55ea79c9f387103d21b231005 |
3 years ago |
|
Yanqin Jin
|
bbdaf63d0f |
Fix a TSAN-reported bug caused by concurrent accesss to std::deque (#9686)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9686 According to https://www.cplusplus.com/reference/deque/deque/back/, " The container is accessed (neither the const nor the non-const versions modify the container). The last element is potentially accessed or modified by the caller. Concurrently accessing or modifying other elements is safe. " Also according to https://www.cplusplus.com/reference/deque/deque/pop_front/, " The container is modified. The first element is modified. Concurrently accessing or modifying other elements is safe (although see iterator validity above). " In RocksDB, we never pop the last element of `DBImpl::alive_log_files_`. We have been exploiting this fact and the above two properties when ensuring correctness when `DBImpl::alive_log_files_` may be accessed concurrently. Specifically, it can be accessed in the write path when db mutex is released. Sometimes, the log_mute_ is held. It can also be accessed in `FindObsoleteFiles()` when db mutex is always held. It can also be accessed during recovery when db mutex is also held. Given the fact that we never pop the last element of alive_log_files_, we currently do not acquire additional locks when accessing it in `WriteToWAL()` as follows ``` alive_log_files_.back().AddSize(log_entry.size()); ``` This is problematic. Check source code of deque.h ``` back() _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); ... } pop_front() _GLIBCXX_NOEXCEPT { ... if (this->_M_impl._M_start._M_cur != this->_M_impl._M_start._M_last - 1) { ... ++this->_M_impl._M_start._M_cur; } ... } ``` `back()` will actually call `__glibcxx_requires_nonempty()` first. If `__glibcxx_requires_nonempty()` is enabled and not an empty macro, it will call `empty()` ``` bool empty() { return this->_M_impl._M_finish == this->_M_impl._M_start; } ``` You can see that it will access `this->_M_impl._M_start`, racing with `pop_front()`. Therefore, TSAN will actually catch the bug in this case. To be able to use TSAN on our library and unit tests, we should always coordinate concurrent accesses to STL containers properly. We need to pass information about db mutex and log mutex into `WriteToWAL()`, otherwise it's impossible to know which mutex to acquire inside the function. To fix this, we can catch the tail of `alive_log_files_` by reference, so that we do not have to call `back()` in `WriteToWAL()`. Reviewed By: pdillinger Differential Revision: D34780309 fbshipit-source-id: 1def9821f0c437f2736c6a26445d75890377889b |
3 years ago |
|
Jay Zhuang
|
09b0e8f2c7 |
Fix a timer crash caused by invalid memory management (#9656)
Summary: Timer crash when multiple DB instances doing heavy DB open and close operations concurrently. Which is caused by adding a timer task with smaller timestamp than the current running task. Fix it by moving the getting new task timestamp part within timer mutex protection. And other fixes: - Disallow adding duplicated function name to timer - Fix a minor memory leak in timer when a running task is cancelled Pull Request resolved: https://github.com/facebook/rocksdb/pull/9656 Reviewed By: ajkr Differential Revision: D34626296 Pulled By: jay-zhuang fbshipit-source-id: 6b6d96a5149746bf503546244912a9e41a0c5f6b |
3 years ago |
|
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 |
|
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 |
|
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 |
|
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 |
|
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
|
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 |
|
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 |
|
Jay Zhuang
|
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 |
|
slk
|
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 |
|
Jay Zhuang
|
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 |
|
Peter Dillinger
|
3ffb3baa0b |
Add (Live)FileStorageInfo API (#8968)
Summary: New classes FileStorageInfo and LiveFileStorageInfo and 'experimental' function DB::GetLiveFilesStorageInfo, which is intended to largely replace several fragmented DB functions needed to create checkpoints and backups. This function is now used to create checkpoints and backups, because it fixes many (probably not all) of the prior complexities of checkpoint not having atomic access to DB metadata. This also ensures strong functional test coverage of the new API. Specifically, much of the old CheckpointImpl::CreateCustomCheckpoint has been migrated to and updated in DBImpl::GetLiveFilesStorageInfo, with the former now calling the latter. Also, the class FileStorageInfo in metadata.h compatibly replaces BackupFileInfo and serves as a new base class for SstFileMetaData. Some old fields of SstFileMetaData are still provided (for now) but deprecated. Although FileStorageInfo::directory is accurate when using db_paths and/or cf_paths, these have never been supported by Checkpoint nor BackupEngine and still are not. This change does now detect these cases and return NotSupported when appropriate. (More work needed for support.) Somehow this change broke ProgressCallbackDuringBackup, but the progress_callback logic was dubious to begin with because it would call the callback based on copy buffer size, not size actually copied. Logic and test updated to track size actually copied per-thread. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8968 Test Plan: tests updated. DB::GetLiveFilesStorageInfo mostly tested by use in CheckpointImpl. DBTest.SnapshotFiles updated to also test GetLiveFilesStorageInfo, including reading the data after DB close. Added CheckpointTest.CheckpointWithDbPath (NotSupported). Reviewed By: siying Differential Revision: D31242045 Pulled By: pdillinger fbshipit-source-id: b183d1ce9799e220daaefd6b3b5365d98de676c0 |
3 years ago |
|
mrambacher
|
13ae16c315 |
Cleanup includes in dbformat.h (#8930)
Summary: This header file was including everything and the kitchen sink when it did not need to. This resulted in many places including this header when they needed other pieces instead. Cleaned up this header to only include what was needed and fixed up the remaining code to include what was now missing. Hopefully, this sort of code hygiene cleanup will speed up the builds... Pull Request resolved: https://github.com/facebook/rocksdb/pull/8930 Reviewed By: pdillinger Differential Revision: D31142788 Pulled By: mrambacher fbshipit-source-id: 6b45de3f300750c79f751f6227dece9cfd44085d |
3 years ago |
|
Akanksha Mahajan
|
d6aa8c49f8 |
Expose blob file information through the EventListener interface (#8675)
Summary: 1. Extend FlushJobInfo and CompactionJobInfo with information about the blob files generated by flush/compaction jobs. This PR add two structures BlobFileInfo and BlobFileGarbageInfo that contains the required information of blob files. 2. Notify the creation and deletion of blob files through OnBlobFileCreationStarted, OnBlobFileCreated, and OnBlobFileDeleted. 3. Test OnFile*Finish operations notifications with Blob Files. 4. Log the blob file creation/deletion events through EventLogger in Log file. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8675 Test Plan: Add new unit tests in listener_test Reviewed By: ltamasi Differential Revision: D30412613 Pulled By: akankshamahajan15 fbshipit-source-id: ca51b63c6e8c8d0485a38c503572bc5a82bd5d07 |
3 years ago |
|
Adam Retter
|
5de333fd99 |
Add db_test2 to to ASSERT_STATUS_CHECKED (#8640)
Summary: This is the `db_test2` parts of https://github.com/facebook/rocksdb/pull/7737 reworked on the latest HEAD. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8640 Reviewed By: akankshamahajan15 Differential Revision: D30303684 Pulled By: mrambacher fbshipit-source-id: 263e2f82d849bde4048b60aed8b31e7deed4706a |
3 years ago |
|
mrambacher
|
ab7f7c9e49 |
Allow WAL dir to change with db dir (#8582)
Summary: Prior to this change, the "wal_dir" DBOption would always be set (defaults to dbname) when the DBOptions were sanitized. Because of this setitng in the options file, it was not possible to rename/relocate a database directory after it had been created and use the existing options file. After this change, the "wal_dir" option is only set under specific circumstances. Methods were added to the ImmutableDBOptions class to see if it is set and if it is set to something other than the dbname. Additionally, a method was added to retrieve the effective value of the WAL dir (either the option or the dbname/path). Tests were added to the core and ldb to test that a database could be created and renamed without issue. Additional tests for various permutations of wal_dir were also added. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8582 Reviewed By: pdillinger, autopear Differential Revision: D29881122 Pulled By: mrambacher fbshipit-source-id: 67d3d033dc8813d59917b0a3fba2550c0efd6dfb |
3 years ago |
|
Baptiste Lemaire
|
c521a9ab2b |
Retire superfluous functions introduced in earlier mempurge PRs. (#8558)
Summary: The main challenge to make the memtable garbage collection prototype (nicknamed `mempurge`) was to not get rid of WAL files that contain unflushed (but mempurged) data. That was successfully guaranteed by not writing the VersionEdit to the MANIFEST file after a successful mempurge. By not writing VersionEdits to the `MANIFEST` file after a succesful mempurge operation, we do not change the earliest log file number that contains unflushed data: `cfd->GetLogNumber()` (`cfd->SetLogNumber()` is only called in `VersionSet::ProcessManifestWrites`). As a result, a number of functions introduced earlier just for the mempurge operation are not obscolete/redundant. (e.g.: `FlushJob::ExtractEarliestLogFileNumber`), and this PR aims at cleaning up all these now-unnecessary functions. In particular, we no longer need to store the earliest log file number in the `MemTable` struct itself. This PR therefore also reverts the `MemTable` struct to its original form. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8558 Test Plan: Already included in `db_flush_test.cc`. Reviewed By: anand1976 Differential Revision: D29764351 Pulled By: bjlemaire fbshipit-source-id: 0f43b260fa270251862512f397d3f24ee62e8437 |
3 years ago |
|
Yanqin Jin
|
2e5388178f |
Return error if trying to open secondary on missing or inaccessible primary (#8200)
Summary: If the primary's CURRENT file is missing or inaccessible, the secondary should not hang trying repeatedly to switch to the next MANIFEST. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8200 Test Plan: make check Reviewed By: jay-zhuang Differential Revision: D27840627 Pulled By: riversand963 fbshipit-source-id: 071fed97cbab1bc5cdefd1dc235e5cd406c174e1 |
3 years ago |
|
Baptiste Lemaire
|
206845c057 |
Mempurge support for wal (#8528)
Summary: In this PR, `mempurge` is made compatible with the Write Ahead Log: in case of recovery, the DB is now capable of recovering the data that was "mempurged" and kept in the `imm()` list of immutable memtables. The twist was to add a uint64_t to the `memtable` struct to store the number of the earliest log file containing entries from the `memtable`. When a `Flush` operation is replaced with a `MemPurge`, the `VersionEdit` (which usually contains the new min log file number to pick up for recovery and the level 0 file path of the newly created SST file) is no longer appended to the manifest log, and every time the `deleteWal` method is called, a check is made on the list of immutable memtables. This PR also includes a unit test that verifies that no data is lost upon Reopening of the database when the mempurge feature is activated. This extensive unit test includes two column families, with valid data contained in the imm() at time of "crash"/reopening (recovery). Pull Request resolved: https://github.com/facebook/rocksdb/pull/8528 Reviewed By: pdillinger Differential Revision: D29701097 Pulled By: bjlemaire fbshipit-source-id: 072a900fb6ccc1edcf5eef6caf88f3060238edf9 |
3 years ago |
|
Zhichao Cao
|
a904c62d28 |
Using existing crc32c checksum in checksum handoff for Manifest and WAL (#8412)
Summary: In PR https://github.com/facebook/rocksdb/issues/7523 , checksum handoff is introduced in RocksDB for WAL, Manifest, and SST files. When user enable checksum handoff for a certain type of file, before the data is written to the lower layer storage system, we calculate the checksum (crc32c) of each piece of data and pass the checksum down with the data, such that data verification can be down by the lower layer storage system if it has the capability. However, it cannot cover the whole lifetime of the data in the memory and also it potentially introduces extra checksum calculation overhead. In this PR, we introduce a new interface in WritableFileWriter::Append, which allows the caller be able to pass the data and the checksum (crc32c) together. In this way, WritableFileWriter can directly use the pass-in checksum (crc32c) to generate the checksum of data being passed down to the storage system. It saves the calculation overhead and achieves higher protection coverage. When a new checksum is added with the data, we use Crc32cCombine https://github.com/facebook/rocksdb/issues/8305 to combine the existing checksum and the new checksum. To avoid the segmenting of data by rate-limiter before it is stored, rate-limiter is called enough times to accumulate enough credits for a certain write. This design only support Manifest and WAL which use log_writer in the current stage. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8412 Test Plan: make check, add new testing cases. Reviewed By: anand1976 Differential Revision: D29151545 Pulled By: zhichao-cao fbshipit-source-id: 75e2278c5126cfd58393c67b1efd18dcc7a30772 |
3 years ago |
|
anand76
|
575ea26ec9 |
Don't log a warning if file system doesn't support ReopenWritableFile() (#8414)
Summary: RocksDB logs a warning if WAL truncation on DB open fails. Its possible that on some file systems, truncation is not required and they would return ```Status::NotSupported()``` for ```ReopenWritableFile```. Don't log a warning in such cases. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8414 Reviewed By: akankshamahajan15 Differential Revision: D29181738 Pulled By: anand1976 fbshipit-source-id: 6e01e9117e1e4c1d67daa4dcee7fa59d06e057a7 |
3 years ago |
|
Zhichao Cao
|
f44e69c64a |
Use DbSessionId as cache key prefix when secondary cache is enabled (#8360)
Summary: Currently, we either use the file system inode or a monotonically incrementing runtime ID as the block cache key prefix. However, if we use a monotonically incrementing runtime ID (in the case that the file system does not support inode id generation), in some cases, it cannot ensure uniqueness (e.g., we have secondary cache migrated from host to host). We use DbSessionID (20 bytes) + current file number (at most 10 bytes) as the new cache block key prefix when the secondary cache is enabled. So can accommodate scenarios such as transfer of cache state across hosts. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8360 Test Plan: add the test to lru_cache_test Reviewed By: pdillinger Differential Revision: D29006215 Pulled By: zhichao-cao fbshipit-source-id: 6cff686b38d83904667a2bd39923cd030df16814 |
3 years ago |
|
Peter (Stig) Edwards
|
c75ef03e58 |
Do not truncate WAL if in read_only mode (#8313)
Summary:
I noticed ```openat``` system call with ```O_WRONLY``` flag and ```sync_file_range``` and ```truncate``` on WAL file when using ```rocksdb::DB::OpenForReadOnly``` by way of ```db_bench --readonly=true --benchmarks=readseq --use_existing_db=1 --num=1 ...```
Noticed in ```strace``` after seeing the last modification time of the WAL file change after each run (with ```--readonly=true```).
I think introduced by
|
3 years ago |
|
Peter Dillinger
|
d2ca04e3ed |
Add more LSM info to FilterBuildingContext (#8246)
Summary: Add `num_levels`, `is_bottommost`, and table file creation `reason` to `FilterBuildingContext`, in anticipation of more powerful Bloom-like filter support. To support this, added `is_bottommost` and `reason` to `TableBuilderOptions`, which allowed removing `reason` parameter from `rocksdb::BuildTable`. I attempted to remove `skip_filters` from `TableBuilderOptions`, because filter construction decisions should arise from options, not one-off parameters. I could not completely remove it because the public API for SstFileWriter takes a `skip_filters` parameter, and translating this into an option change would mean awkwardly replacing the table_factory if it is BlockBasedTableFactory with new filter_policy=nullptr option. I marked this public skip_filters option as deprecated because of this oddity. (skip_filters on the read side probably makes sense.) At least `skip_filters` is now largely hidden for users of `TableBuilderOptions` and is no longer used for implementing the optimize_filters_for_hits option. Bringing the logic for that option closer to handling of FilterBuildingContext makes it more obvious that hese two are using the same notion of "bottommost." (Planned: configuration options for Bloom-like filters that generalize `optimize_filters_for_hits`) Recommended follow-up: Try to get away from "bottommost level" naming of things, which is inaccurate (see VersionStorageInfo::RangeMightExistAfterSortedRun), and move to "bottommost run" or just "bottommost." Pull Request resolved: https://github.com/facebook/rocksdb/pull/8246 Test Plan: extended an existing unit test to exercise and check various filter building contexts. Also, existing tests for optimize_filters_for_hits validate some of the "bottommost" handling, which is now closely connected to FilterBuildingContext::is_bottommost through TableBuilderOptions::is_bottommost Reviewed By: mrambacher Differential Revision: D28099346 Pulled By: pdillinger fbshipit-source-id: 2c1072e29c24d4ac404c761a7b7663292372600a |
4 years ago |
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Peter Dillinger
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85becd94c1 |
Refactor: use TableBuilderOptions to reduce parameter lists (#8240)
Summary: Greatly reduced the not-quite-copy-paste giant parameter lists of rocksdb::NewTableBuilder, rocksdb::BuildTable, BlockBasedTableBuilder::Rep ctor, and BlockBasedTableBuilder ctor. Moved weird separate parameter `uint32_t column_family_id` of TableFactory::NewTableBuilder into TableBuilderOptions. Re-ordered parameters to TableBuilderOptions ctor, so that `uint64_t target_file_size` is not randomly placed between uint64_t timestamps (was easy to mix up). Replaced a couple of fields of BlockBasedTableBuilder::Rep with a FilterBuildingContext. The motivation for this change is making it easier to pass along more data into new fields in FilterBuildingContext (follow-up PR). Pull Request resolved: https://github.com/facebook/rocksdb/pull/8240 Test Plan: ASAN make check Reviewed By: mrambacher Differential Revision: D28075891 Pulled By: pdillinger fbshipit-source-id: fddb3dbb8260a0e8bdcbb51b877ebabf9a690d4f |
4 years ago |
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Zhichao Cao
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09a9ec3ac0 |
Fix the false positive alert of CF consistency check in WAL recovery (#8207)
Summary: In current RocksDB, in recover the information form WAL, we do the consistency check for each column family when one WAL file is corrupted and PointInTimeRecovery is set. However, it will report a false positive alert on "SST file is ahead of WALs" when one of the CF current log number is greater than the corrupted WAL number (CF contains the data beyond the corrupted WAl) due to a new column family creation during flush. In this case, a new WAL is created (it is empty) during a flush. Also, due to some reason (e.g., storage issue or crash happens before SyncCloseLog is called), the old WAL is corrupted. The new CF has no data, therefore, it does not have the consistency issue. Fix: when checking cfd->GetLogNumber() > corrupted_wal_number also check cfd->GetLiveSstFilesSize() > 0. So the CFs with no SST file data will skip the check here. Note potential ignored inconsistency caused due to fix: empty CF can also be caused by write+delete. In this case, after flush, there is no SST files being generated. However, this CF still have the log in the WAL. When the WAL is corrupted, the DB might be inconsistent. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8207 Test Plan: added unit test, make crash_test Reviewed By: riversand963 Differential Revision: D27898839 Pulled By: zhichao-cao fbshipit-source-id: 931fc2d8b92dd00b4169bf84b94e712fd688a83e |
4 years ago |
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Yanqin Jin
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a376c22066 |
Handle rename() failure in non-local FS (#8192)
Summary:
In a distributed environment, a file `rename()` operation can succeed on server (remote)
side, but the client can somehow return non-ok status to RocksDB. Possible reasons include
network partition, connection issue, etc. This happens in `rocksdb::SetCurrentFile()`, which
can be called in `LogAndApply() -> ProcessManifestWrites()` if RocksDB tries to switch to a
new MANIFEST. We currently always delete the new MANIFEST if an error occurs.
This is problematic in distributed world. If the server-side successfully updates the CURRENT
file via renaming, then a subsequent `DB::Open()` will try to look for the new MANIFEST and fail.
As a fix, we can track the execution result of IO operations on the new MANIFEST.
- If IO operations on the new MANIFEST fail, then we know the CURRENT must point to the original
MANIFEST. Therefore, it is safe to remove the new MANIFEST.
- If IO operations on the new MANIFEST all succeed, but somehow we end up in the clean up
code block, then we do not know whether CURRENT points to the new or old MANIFEST. (For local
POSIX-compliant FS, it should still point to old MANIFEST, but it does not matter if we keep the
new MANIFEST.) Therefore, we keep the new MANIFEST.
- Any future `LogAndApply()` will switch to a new MANIFEST and update CURRENT.
- If process reopens the db immediately after the failure, then the CURRENT file can point
to either the new MANIFEST or the old one, both of which exist. Therefore, recovery can
succeed and ignore the other.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8192
Test Plan: make check
Reviewed By: zhichao-cao
Differential Revision: D27804648
Pulled By: riversand963
fbshipit-source-id: 9c16f2a5ce41bc6aadf085e48449b19ede8423e4
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4 years ago |
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Yanqin Jin
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b1f62be10e |
Use the right level (L0) for files written during WAL recovery (#8187)
Summary: As the name of `DBImpl::WriteLevel0TableForRecovery` suggests, the resulting table file should be placed on L0. However, the argument `level` passed to `BuildTable()` is -1. We need to correct this since the level information will be useful to determine file placement. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8187 Test Plan: make check Reviewed By: ltamasi Differential Revision: D27748570 Pulled By: riversand963 fbshipit-source-id: e1cd23128a8de31f14b1edc2ea92754c154e4f10 |
4 years ago |
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Peter Dillinger
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879357fdb0 |
Make backups openable as read-only DBs (#8142)
Summary: A current limitation of backups is that you don't know the exact database state of when the backup was taken. With this new feature, you can at least inspect the backup's DB state without restoring it by opening it as a read-only DB. Rather than add something like OpenAsReadOnlyDB to the BackupEngine API, which would inhibit opening stackable DB implementations read-only (if/when their APIs support it), we instead provide a DB name and Env that can be used to open as a read-only DB. Possible follow-up work: * Add a version of GetBackupInfo for a single backup. * Let CreateNewBackup return the BackupID of the newly-created backup. Implementation details: Refactored ChrootFileSystem to split off new base class RemapFileSystem, which allows more general remapping of files. We use this base class to implement BackupEngineImpl::RemapSharedFileSystem. To minimize API impact, I decided to just add these fields `name_for_open` and `env_for_open` to those set by GetBackupInfo when include_file_details=true. Creating the RemapSharedFileSystem adds a bit to the memory consumption, perhaps unnecessarily in some cases, but this has been mitigated by (a) only initialize the RemapSharedFileSystem lazily when GetBackupInfo with include_file_details=true is called, and (b) using the existing `shared_ptr<FileInfo>` objects to hold most of the mapping data. To enhance API safety, RemapSharedFileSystem is wrapped by new ReadOnlyFileSystem which rejects any attempts to write. This uncovered a couple of places in which DB::OpenForReadOnly would write to the filesystem, so I fixed these. Added a release note because this affects logging. Additional minor refactoring in backupable_db.cc to support the new functionality. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8142 Test Plan: new test (run with ASAN and UBSAN), added to stress test and ran it for a while with amplified backup_one_in Reviewed By: ajkr Differential Revision: D27535408 Pulled By: pdillinger fbshipit-source-id: 04666d310aa0261ef6b2385c43ca793ce1dfd148 |
4 years ago |
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anand76
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7d7f14480e |
Always truncate the latest WAL file on DB Open (#8122)
Summary: Currently, we only truncate the latest alive WAL files when the DB is opened. If the latest WAL file is empty or was flushed during Open, its not truncated since the file will be deleted later on in the Open path. However, before deletion, a new WAL file is created, and if the process crash loops between the new WAL file creation and deletion of the old WAL file, the preallocated space will keep accumulating and eventually use up all disk space. To prevent this, always truncate the latest WAL file, even if its empty or the data was flushed. Tests: Add unit tests to db_wal_test Pull Request resolved: https://github.com/facebook/rocksdb/pull/8122 Reviewed By: riversand963 Differential Revision: D27366132 Pulled By: anand1976 fbshipit-source-id: f923cc03ef033ccb32b140d36c6a63a8152f0e8e |
4 years ago |
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Andrew Kryczka
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c20a7cd6c7 |
Apply `sample_for_compression` to all block-based tables (#8105)
Summary: Previously it only applied to block-based tables generated by flush. This restriction was undocumented and blocked a new use case. Now compression sampling applies to all block-based tables we generate when it is enabled. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8105 Test Plan: new unit test Reviewed By: riversand963 Differential Revision: D27317275 Pulled By: ajkr fbshipit-source-id: cd9fcc5178d6515e8cb59c6facb5ac01893cb5b0 |
4 years ago |
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Akanksha Mahajan
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27d57a035e |
Use SST file manager to track blob files as well (#8037)
Summary: Extend support to track blob files in SST File manager. This PR notifies SstFileManager whenever a new blob file is created, via OnAddFile and an obsolete blob file deleted via OnDeleteFile and delete file via ScheduleFileDeletion. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8037 Test Plan: Add new unit tests Reviewed By: ltamasi Differential Revision: D26891237 Pulled By: akankshamahajan15 fbshipit-source-id: 04c69ccfda2a73782fd5c51982dae58dd11979b6 |
4 years ago |
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mrambacher
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3dff28cf9b |
Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033)
Summary: For performance purposes, the lower level routines were changed to use a SystemClock* instead of a std::shared_ptr<SystemClock>. The shared ptr has some performance degradation on certain hardware classes. For most of the system, there is no risk of the pointer being deleted/invalid because the shared_ptr will be stored elsewhere. For example, the ImmutableDBOptions stores the Env which has a std::shared_ptr<SystemClock> in it. The SystemClock* within the ImmutableDBOptions is essentially a "short cut" to gain access to this constant resource. There were a few classes (PeriodicWorkScheduler?) where the "short cut" property did not hold. In those cases, the shared pointer was preserved. Using db_bench readrandom perf_level=3 on my EC2 box, this change performed as well or better than 6.17: 6.17: readrandom : 28.046 micros/op 854902 ops/sec; 61.3 MB/s (355999 of 355999 found) 6.18: readrandom : 32.615 micros/op 735306 ops/sec; 52.7 MB/s (290999 of 290999 found) PR: readrandom : 27.500 micros/op 871909 ops/sec; 62.5 MB/s (367999 of 367999 found) (Note that the times for 6.18 are prior to revert of the SystemClock). Pull Request resolved: https://github.com/facebook/rocksdb/pull/8033 Reviewed By: pdillinger Differential Revision: D27014563 Pulled By: mrambacher fbshipit-source-id: ad0459eba03182e454391b5926bf5cdd45657b67 |
4 years ago |