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435 Commits (adc9001f2058c8b6cba2ee72c1ae49dbcb475f86)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Hui Xiao
|
151242ce46 |
Group rocksdb.sst.read.micros stat by IOActivity flush and compaction (#11288)
Summary:
**Context:**
The existing stat rocksdb.sst.read.micros does not reflect each of compaction and flush cases but aggregate them, which is not so helpful for us to understand IO read behavior of each of them.
**Summary**
- Update `StopWatch` and `RandomAccessFileReader` to record `rocksdb.sst.read.micros` and `rocksdb.file.{flush/compaction}.read.micros`
- Fixed the default histogram in `RandomAccessFileReader`
- New field `ReadOptions/IOOptions::io_activity`; Pass `ReadOptions` through paths under db open, flush and compaction to where we can prepare `IOOptions` and pass it to `RandomAccessFileReader`
- Use `thread_status_util` for assertion in `DbStressFSWrapper` for continuous testing on we are passing correct `io_activity` under db open, flush and compaction
Pull Request resolved: https://github.com/facebook/rocksdb/pull/11288
Test Plan:
- **Stress test**
- **Db bench 1: rocksdb.sst.read.micros COUNT ≈ sum of rocksdb.file.read.flush.micros's and rocksdb.file.read.compaction.micros's.** (without blob)
- May not be exactly the same due to `HistogramStat::Add` only guarantees atomic not accuracy across threads.
```
./db_bench -db=/dev/shm/testdb/ -statistics=true -benchmarks="fillseq" -key_size=32 -value_size=512 -num=50000 -write_buffer_size=655 -target_file_size_base=655 -disable_auto_compactions=false -compression_type=none -bloom_bits=3 (-use_plain_table=1 -prefix_size=10)
```
```
// BlockBasedTable
rocksdb.sst.read.micros P50 : 2.009374 P95 : 4.968548 P99 : 8.110362 P100 : 43.000000 COUNT : 40456 SUM : 114805
rocksdb.file.read.flush.micros P50 : 1.871841 P95 : 3.872407 P99 : 5.540541 P100 : 43.000000 COUNT : 2250 SUM : 6116
rocksdb.file.read.compaction.micros P50 : 2.023109 P95 : 5.029149 P99 : 8.196910 P100 : 26.000000 COUNT : 38206 SUM : 108689
// PlainTable
Does not apply
```
- **Db bench 2: performance**
**Read**
SETUP: db with 900 files
```
./db_bench -db=/dev/shm/testdb/ -benchmarks="fillseq" -key_size=32 -value_size=512 -num=50000 -write_buffer_size=655 -disable_auto_compactions=true -target_file_size_base=655 -compression_type=none
```run till convergence
```
./db_bench -seed=1678564177044286 -use_existing_db=true -db=/dev/shm/testdb -benchmarks=readrandom[-X60] -statistics=true -num=1000000 -disable_auto_compactions=true -compression_type=none -bloom_bits=3
```
Pre-change
`readrandom [AVG 60 runs] : 21568 (± 248) ops/sec`
Post-change (no regression, -0.3%)
`readrandom [AVG 60 runs] : 21486 (± 236) ops/sec`
**Compaction/Flush**run till convergence
```
./db_bench -db=/dev/shm/testdb2/ -seed=1678564177044286 -benchmarks="fillseq[-X60]" -key_size=32 -value_size=512 -num=50000 -write_buffer_size=655 -disable_auto_compactions=false -target_file_size_base=655 -compression_type=none
rocksdb.sst.read.micros COUNT : 33820
rocksdb.sst.read.flush.micros COUNT : 1800
rocksdb.sst.read.compaction.micros COUNT : 32020
```
Pre-change
`fillseq [AVG 46 runs] : 1391 (± 214) ops/sec; 0.7 (± 0.1) MB/sec`
Post-change (no regression, ~-0.4%)
`fillseq [AVG 46 runs] : 1385 (± 216) ops/sec; 0.7 (± 0.1) MB/sec`
Reviewed By: ajkr
Differential Revision: D44007011
Pulled By: hx235
fbshipit-source-id: a54c89e4846dfc9a135389edf3f3eedfea257132
|
2 years ago |
|
Peter Dillinger
|
390cc0b156 |
Ensure LockWAL() stall cleared for UnlockWAL() return (#11172)
Summary: Fixes https://github.com/facebook/rocksdb/issues/11160 By counting the number of stalls placed on a write queue, we can check in UnlockWAL() whether the stall present at the start of UnlockWAL() has been cleared by the end, or wait until it's cleared. More details in code comments and new unit test. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11172 Test Plan: unit test added. Yes, it uses sleep to amplify failure on buggy behavior if present, but using a sync point to only allow new behavior would fail with the old code only because it doesn't contain the new sync point. Basically, using a sync point in UnlockWAL() could easily mask a regression by artificially limiting key behaviors. The test would only check that UnlockWAL() invokes code that *should* do the right thing, without checking that it *does* the right thing. Reviewed By: ajkr Differential Revision: D42894341 Pulled By: pdillinger fbshipit-source-id: 15c9da0ca383e6aec845b29f5447d76cecbf46c3 |
2 years ago |
|
sdong
|
4720ba4391 |
Remove RocksDB LITE (#11147)
Summary: We haven't been actively mantaining RocksDB LITE recently and the size must have been gone up significantly. We are removing the support. Most of changes were done through following comments: unifdef -m -UROCKSDB_LITE `git grep -l ROCKSDB_LITE | egrep '[.](cc|h)'` by Peter Dillinger. Others changes were manually applied to build scripts, CircleCI manifests, ROCKSDB_LITE is used in an expression and file db_stress_test_base.cc. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11147 Test Plan: See CI Reviewed By: pdillinger Differential Revision: D42796341 fbshipit-source-id: 4920e15fc2060c2cd2221330a6d0e5e65d4b7fe2 |
2 years ago |
|
Peter Dillinger
|
546e213c4f |
Fix DelayWrite() calls for two_write_queues (#11130)
Summary: PR https://github.com/facebook/rocksdb/issues/11020 fixed a case where it was easy to deadlock the DB with LockWAL() but introduced a bug showing up as a rare assertion failure in the stress test. Specifically, `assert(w->state == STATE_INIT)` in `WriteThread::LinkOne()` called from `BeginWriteStall()`, `DelayWrite()`, `WriteImplWALOnly()`. I haven't been about to generate a unit test that reproduces this failure but I believe the root cause is that DelayWrite() was never meant to be re-entrant, only called from the DB's write_thread_ leader. https://github.com/facebook/rocksdb/issues/11020 introduced a call to DelayWrite() from the nonmem_write_thread_ group leader. This fix is to make DelayWrite() apply to the specific write queue that it is being called from (inject a dummy write stall entry to the head of the appropriate write queue). WriteController is re-entrant, based on polling and state changes signalled with bg_cv_, so can manage stalling two queues. The only anticipated complication (called out by Andrew in previous PR) is that we don't want timed write delays being injected in parallel for the two queues, because that dimishes the intended throttling effect. Thus, we only allow timed delays for the primary write queue. HISTORY not updated because this is intended for the same release where the bug was introduced. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11130 Test Plan: Although I was not able to reproduce the assertion failure, I was able to reproduce a distinct flaw with what I believe is the same root cause: a kind of deadlock if both write queues need to wake up from stopped writes. Only one will be waiting on bg_cv_ (the other waiting in `LinkOne()` for the write queue to open up), so a single SignalAll() will only unblock one of the queues, with the other re-instating the stop until another signal on bg_cv_. A simple unit test is added for this case. Will also run crash_test_with_multiops_wc_txn for a while looking for issues. Reviewed By: ajkr Differential Revision: D42749330 Pulled By: pdillinger fbshipit-source-id: 4317dd899a93d57c26fd5af7143038f82d4d4d1b |
2 years ago |
|
Wenlong Zhang
|
1cfe3528a2 |
support loongarch64 for rocksdb (#10036)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/10036 Reviewed By: hx235 Differential Revision: D42424074 Pulled By: ajkr fbshipit-source-id: 004adb75005a26bd01c5d568d1ec6ac442cd59dd |
2 years ago |
|
Yanqin Jin
|
c93ba7db5d |
Revise LockWAL/UnlockWAL implementation (#11020)
Summary: RocksDB has two public APIs: `DB::LockWAL()`/`DB::UnlockWAL()`. The current implementation acquires and releases the internal `DBImpl::log_write_mutex_`. According to the comment on `DBImpl::log_write_mutex_`: https://github.com/facebook/rocksdb/blob/7.8.fb/db/db_impl/db_impl.h#L2287:L2288 > Note: to avoid dealock, if needed to acquire both log_write_mutex_ and mutex_, the order should be first mutex_ and then log_write_mutex_. This puts limitations on how applications can use the `LockWAL()` API. After `LockWAL()` returns ok, then application should not perform any operation that acquires `mutex_`. Currently, the use case of `LockWAL()` is MyRocks implementing the MySQL storage engine handlerton `lock_hton_log` interface. The operation that MyRocks performs after `LockWAL()` is `GetSortedWalFiless()` which not only acquires mutex_, but also `log_write_mutex_`. There are two issues: 1. Applications using these two APIs may hang if one thread calls `GetSortedWalFiles()` after calling `LockWAL()` because log_write_mutex is not recursive. 2. Two threads may dead lock due to lock order inversion. To fix these issues, we can modify the implementation of LockWAL so that it does not keep `log_write_mutex_` held until UnlockWAL. To achieve the goal of locking the WAL, we can instead manually inject a write stall so that all future writes will be stopped. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11020 Test Plan: make check Reviewed By: ajkr Differential Revision: D41785203 Pulled By: riversand963 fbshipit-source-id: 5ccb7a9c6eb9a2c3fa80fd2c399cc2568b8f89ce |
2 years ago |
|
Yanqin Jin
|
75aca74017 |
Replace member variable lambda with methods (#10924)
Summary: In transaction unit tests, replace a few member variable lambdas with non-static methods. It's easier for gdb to work with variables in methods than in lambdas. (Seen similar things to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86675). Pull Request resolved: https://github.com/facebook/rocksdb/pull/10924 Test Plan: make check Reviewed By: jay-zhuang Differential Revision: D41072241 Pulled By: riversand963 fbshipit-source-id: e4fa491de573c4656225a86a75af926c1df827f6 |
2 years ago |
|
Yanqin Jin
|
0547cecb81 |
Reduce access to atomic variables in a test (#10909)
Summary: With TSAN build on CircleCI (see mini-tsan in .circleci/config). Sometimes `SeqAdvanceConcurrentTest.SeqAdvanceConcurrent` will get stuck when an experimental feature called "unordered write" is enabled. Stack trace will be the following ``` Thread 7 (Thread 0x7f2284a1c700 (LWP 481523) "write_prepared_"): #0 0x00000000004fa3f5 in __tsan_atomic64_load () at ./db/merge_context.h:15 https://github.com/facebook/rocksdb/issues/1 0x00000000005e5942 in std::__atomic_base<unsigned long>::load (this=0x7b74000012f8, __m=std::memory_order_seq_cst) at /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/atomic_base.h:481 https://github.com/facebook/rocksdb/issues/2 std::__atomic_base<unsigned long>::operator unsigned long (this=0x7b74000012f8) at /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/atomic_base.h:341 https://github.com/facebook/rocksdb/issues/3 0x00000000005bf001 in rocksdb::SeqAdvanceConcurrentTest_SeqAdvanceConcurrent_Test::TestBody()::$_9::operator()(void*) const (this=0x7b14000085e8) at utilities/transactions/write_prepared_transaction_test.cc:1702 Thread 6 (Thread 0x7f228421b700 (LWP 481521) "write_prepared_"): #0 0x000000000052178c in __tsan::MetaMap::GetAndLock(__tsan::ThreadState*, unsigned long, unsigned long, bool, bool) () at ./db/merge_context.h:15 https://github.com/facebook/rocksdb/issues/1 0x00000000004fa48e in __tsan_atomic64_load () at ./db/merge_context.h:15 https://github.com/facebook/rocksdb/issues/2 0x00000000005e5942 in std::__atomic_base<unsigned long>::load (this=0x7b74000012f8, __m=std::memory_order_seq_cst) at /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/atomic_base.h:481 https://github.com/facebook/rocksdb/issues/3 std::__atomic_base<unsigned long>::operator unsigned long (this=0x7b74000012f8) at /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/atomic_base.h:341 https://github.com/facebook/rocksdb/issues/4 0x00000000005bf001 in rocksdb::SeqAdvanceConcurrentTest_SeqAdvanceConcurrent_Test::TestBody()::$_9::operator()(void*) const (this=0x7b14000085e8) at utilities/transactions/write_prepared_transaction_test.cc:1702 ``` This is problematic and suspicious. Two threads will get stuck in the same place trying to load from an atomic variable. https://github.com/facebook/rocksdb/blob/7.8.fb/utilities/transactions/write_prepared_transaction_test.cc#L1694:L1707. Not sure why two threads can reach the same point. The stack trace shows that there may be a deadlock, since the two threads are on the same write thread (one is doing Prepare, while the other is trying to commit). Pull Request resolved: https://github.com/facebook/rocksdb/pull/10909 Test Plan: On CircleCI mini-tsan, apply a patch first so that we have a higher chance of hitting the same problematic situation, ``` diff --git a/utilities/transactions/write_prepared_transaction_test.cc b/utilities/transactions/write_prepared_transaction_test.cc index 4bc1f3744..bd5dc4924 100644 --- a/utilities/transactions/write_prepared_transaction_test.cc +++ b/utilities/transactions/write_prepared_transaction_test.cc @@ -1714,13 +1714,13 @@ TEST_P(SeqAdvanceConcurrentTest, SeqAdvanceConcurrent) { size_t d = (n % base[bi + 1]) / base[bi]; switch (d) { case 0: - threads.emplace_back(txn_t0, bi); + threads.emplace_back(txn_t3, bi); break; case 1: - threads.emplace_back(txn_t1, bi); + threads.emplace_back(txn_t3, bi); break; case 2: - threads.emplace_back(txn_t2, bi); + threads.emplace_back(txn_t3, bi); break; case 3: threads.emplace_back(txn_t3, bi); ``` then build and run tests ``` COMPILE_WITH_TSAN=1 CC=clang-13 CXX=clang++-13 ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 check gtest-parallel -r 100 ./write_prepared_transaction_test --gtest_filter=TwoWriteQueues/SeqAdvanceConcurrentTest.SeqAdvanceConcurrent/19 ``` In the above, `SeqAdvanceConcurrent/19`. The tests 10 to 19 correspond to unordered write in which Prepare() and Commit() can both enter the same write thread. Before this PR, there is a high chance of hitting the deadlock. With this PR, no deadlock has been encountered so far. Reviewed By: ltamasi Differential Revision: D40869387 Pulled By: riversand963 fbshipit-source-id: 81e82a70c263e4f3417597a201b081ee54f1deab |
2 years ago |
|
Yanqin Jin
|
7d26e4c5a3 |
Basic Support for Merge with user-defined timestamp (#10819)
Summary:
This PR implements the originally disabled `Merge()` APIs when user-defined timestamp is enabled.
Simplest usage:
```cpp
// assume string append merge op is used with '.' as delimiter.
// ts1 < ts2
db->Put(WriteOptions(), "key", ts1, "v0");
db->Merge(WriteOptions(), "key", ts2, "1");
ReadOptions ro;
ro.timestamp = &ts2;
db->Get(ro, "key", &value);
ASSERT_EQ("v0.1", value);
```
Some code comments are added for clarity.
Note: support for timestamp in `DB::GetMergeOperands()` will be done in a follow-up PR.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10819
Test Plan: make check
Reviewed By: ltamasi
Differential Revision: D40603195
Pulled By: riversand963
fbshipit-source-id: f96d6f183258f3392d80377025529f7660503013
|
2 years ago |
|
Yanqin Jin
|
900f79126d |
Pass `const LockInfo&` to AcquireLocked() and AcquireWithTimeout (#10874)
Summary: The motivation and benefit of current behavior of passing `LockInfo&&` as argument to AcquireLocked() and AcquireWithTimeout() is not clear to me. Furthermore, in AcquireWithTimeout(), we access members of `LockInfo&&` after it is passed to AcquireLocked() as rvalue ref. In addition, we may call `AcquireLocked()` with `std::move(lock_info)` multiple times. This leads to linter warning of use-after-move. If future implementation of AcquireLocked() does something like moving-construct a new `LockedInfo` using the passed-in `LockInfo&&`, then the caller cannot use it because `LockInfo` has a member of type `autovector`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10874 Test Plan: make check Reviewed By: ltamasi Differential Revision: D40704210 Pulled By: riversand963 fbshipit-source-id: 20091df65b4fc63b072bcec9809efc49955d6d35 |
2 years ago |
|
Yanqin Jin
|
95a1935cb1 |
Run clang-format on utilities/transactions (#10871)
Summary: This PR is the result of running the following command ``` find ./utilities/transactions/ -name '*.cc' -o -name '*.h' -o -name '*.c' -o -name '*.hpp' -o -name '*.cpp' | xargs clang-format -i ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/10871 Test Plan: make check Reviewed By: cbi42 Differential Revision: D40686871 Pulled By: riversand963 fbshipit-source-id: 613738d667ec8f8e13cce4802e0e166d6be52211 |
2 years ago |
|
Peter Dillinger
|
e466173d5c |
Print stack traces on frozen tests in CI (#10828)
Summary: Instead of existing calls to ps from gnu_parallel, call a new wrapper that does ps, looks for unit test like processes, and uses pstack or gdb to print thread stack traces. Also, using `ps -wwf` instead of `ps -wf` ensures output is not cut off. For security, CircleCI runs with security restrictions on ptrace (/proc/sys/kernel/yama/ptrace_scope = 1), and this change adds a work-around to `InstallStackTraceHandler()` (only used by testing tools) to allow any process from the same user to debug it. (I've also touched >100 files to ensure all the unit tests call this function.) Pull Request resolved: https://github.com/facebook/rocksdb/pull/10828 Test Plan: local manual + temporary infinite loop in a unit test to observe in CircleCI Reviewed By: hx235 Differential Revision: D40447634 Pulled By: pdillinger fbshipit-source-id: 718a4c4a5b54fa0f9af2d01a446162b45e5e84e1 |
2 years ago |
|
Yanqin Jin
|
07249fea8f |
Fix DBImpl::GetLatestSequenceForKey() for Merge (#10724)
Summary: Currently, without this fix, DBImpl::GetLatestSequenceForKey() may not return the latest sequence number for merge operands of the key. This can cause conflict checking during optimistic transaction commit phase to fail. Fix it by always returning the latest sequence number of the key, also considering range tombstones. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10724 Test Plan: make check Reviewed By: cbi42 Differential Revision: D39756847 Pulled By: riversand963 fbshipit-source-id: 0764c3dd4cb24960b37e18adccc6e7feed0e6876 |
2 years ago |
|
Yanqin Jin
|
832fd644fc |
Reset pessimistic transaction's read/commit timestamps during Initialize() (#10677)
Summary:
RocksDB allows reusing old `Transaction` objects when creating new ones. Therefore, we need to
reset the transaction's read and commit timestamps back to default values `kMaxTxnTimestamp`.
Otherwise, `CommitAndTryCreateSnapshot()` may fail with "Status::InvalidArgument("Different commit ts specified")".
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10677
Test Plan: make check
Reviewed By: ltamasi
Differential Revision: D39513543
Pulled By: riversand963
fbshipit-source-id: bea01cac149bff3a23a2978fc0c3b198243a6291
|
2 years ago |
|
sdong
|
bc575c614c |
Fix two extra headers (#10525)
Summary: Fix copyright for two more extra headers to make internal tool happy. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10525 Reviewed By: jay-zhuang Differential Revision: D38661390 fbshipit-source-id: ab2d055bfd145dfe82b5bae7a6c25cc338c8de94 |
2 years ago |
|
sdong
|
9277569ba3 |
Add some missing headers (#10519)
Summary: Some files miss headers. Also some headers are irregular. Fix them to make an internal checkup tool happy. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10519 Reviewed By: jay-zhuang Differential Revision: D38603291 fbshipit-source-id: 13b1bbd6d48f5ee15ba20da67544396de48238f1 |
2 years ago |
|
Jay Zhuang
|
5d3aefb682 |
Migrate to docker for CI run (#10496)
Summary: Moved linux builds to using docker to avoid CI instability caused by dependency installation site down. Added the `Dockerfile` which is used to build the image. The build time is also significantly reduced, because no dependencies installation and with using 2xlarge+ instance for slow build (like tsan test). Also fixed a few issues detected while building this: * `DestoryDB()` Status not checked for a few tests * nullptr might be used in `inlineskiplist.cc` Pull Request resolved: https://github.com/facebook/rocksdb/pull/10496 Test Plan: CI Reviewed By: ajkr Differential Revision: D38554200 Pulled By: jay-zhuang fbshipit-source-id: 16e8fb2bf07b9c84bb27fb18421c4d54f2f248fd |
2 years ago |
|
Jay Zhuang
|
fcccc412d7 |
Remove Travis CI (#10407)
Summary: Travis CI is depreciated and haven't been maintained for some time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10407 Reviewed By: ajkr Differential Revision: D38078382 Pulled By: jay-zhuang fbshipit-source-id: f42057f2f41f722bdce56bf195f67a94835191fb |
2 years ago |
|
DaPorkchop_
|
6bebe65030 |
Correctly implement Create-/DropColumnFamilies for PessimisticTransactionDB (#10332)
Summary: This overrides `CreateColumnFamilies` and `DropColumnFamilies` in `PessimisticTransactionDB` in order to add/remove the created column families to/from the lock manager. Fixes https://github.com/facebook/rocksdb/issues/10322. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10332 Reviewed By: ajkr Differential Revision: D37841079 Pulled By: riversand963 fbshipit-source-id: 854d7d9948b0089e0054a8f2875485ba44436fd2 |
2 years ago |
|
Andrew Kryczka
|
5d6005c780 |
Add WriteOptions::protection_bytes_per_key (#10037)
Summary: Added an option, `WriteOptions::protection_bytes_per_key`, that controls how many bytes per key we use for integrity protection in `WriteBatch`. It takes effect when `WriteBatch::GetProtectionBytesPerKey() == 0`. Currently the only supported value is eight. Invoking a user API with it set to any other nonzero value will result in `Status::NotSupported` returned to the user. There is also a bug fix for integrity protection with `inplace_callback`, where we forgot to take into account the possible change in varint length when calculating KV checksum for the final encoded buffer. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10037 Test Plan: - Manual - Set default value of `WriteOptions::protection_bytes_per_key` to eight and ran `make check -j24` - Enabled in MyShadow for 1+ week - Automated - Unit tests have a `WriteMode` that enables the integrity protection via `WriteOptions` - Crash test - in most cases, use `WriteOptions::protection_bytes_per_key` to enable integrity protection Reviewed By: cbi42 Differential Revision: D36614569 Pulled By: ajkr fbshipit-source-id: 8650087ceac9b61b560f1e5fafe5e1baf9c725fb |
3 years ago |
|
Yanqin Jin
|
1777e5f7e9 |
Snapshots with user-specified timestamps (#9879)
Summary: In RocksDB, keys are associated with (internal) sequence numbers which denote when the keys are written to the database. Sequence numbers in different RocksDB instances are unrelated, thus not comparable. It is nice if we can associate sequence numbers with their corresponding actual timestamps. One thing we can do is to support user-defined timestamp, which allows the applications to specify the format of custom timestamps and encode a timestamp with each key. More details can be found at https://github.com/facebook/rocksdb/wiki/User-defined-Timestamp-%28Experimental%29. This PR provides a different but complementary approach. We can associate rocksdb snapshots (defined in https://github.com/facebook/rocksdb/blob/7.2.fb/include/rocksdb/snapshot.h#L20) with **user-specified** timestamps. Since a snapshot is essentially an object representing a sequence number, this PR establishes a bi-directional mapping between sequence numbers and timestamps. In the past, snapshots are usually taken by readers. The current super-version is grabbed, and a `rocksdb::Snapshot` object is created with the last published sequence number of the super-version. You can see that the reader actually has no good idea of what timestamp to assign to this snapshot, because by the time the `GetSnapshot()` is called, an arbitrarily long period of time may have already elapsed since the last write, which is when the last published sequence number is written. This observation motivates the creation of "timestamped" snapshots on the write path. Currently, this functionality is exposed only to the layer of `TransactionDB`. Application can tell RocksDB to create a snapshot when a transaction commits, effectively associating the last sequence number with a timestamp. It is also assumed that application will ensure any two snapshots with timestamps should satisfy the following: ``` snapshot1.seq < snapshot2.seq iff. snapshot1.ts < snapshot2.ts ``` If the application can guarantee that when a reader takes a timestamped snapshot, there is no active writes going on in the database, then we also allow the user to use a new API `TransactionDB::CreateTimestampedSnapshot()` to create a snapshot with associated timestamp. Code example ```cpp // Create a timestamped snapshot when committing transaction. txn->SetCommitTimestamp(100); txn->SetSnapshotOnNextOperation(); txn->Commit(); // A wrapper API for convenience Status Transaction::CommitAndTryCreateSnapshot( std::shared_ptr<TransactionNotifier> notifier, TxnTimestamp ts, std::shared_ptr<const Snapshot>* ret); // Create a timestamped snapshot if caller guarantees no concurrent writes std::pair<Status, std::shared_ptr<const Snapshot>> snapshot = txn_db->CreateTimestampedSnapshot(100); ``` The snapshots created in this way will be managed by RocksDB with ref-counting and potentially shared with other readers. We provide the following APIs for readers to retrieve a snapshot given a timestamp. ```cpp // Return the timestamped snapshot correponding to given timestamp. If ts is // kMaxTxnTimestamp, then we return the latest timestamped snapshot if present. // Othersise, we return the snapshot whose timestamp is equal to `ts`. If no // such snapshot exists, then we return null. std::shared_ptr<const Snapshot> TransactionDB::GetTimestampedSnapshot(TxnTimestamp ts) const; // Return the latest timestamped snapshot if present. std::shared_ptr<const Snapshot> TransactionDB::GetLatestTimestampedSnapshot() const; ``` We also provide two additional APIs for stats collection and reporting purposes. ```cpp Status TransactionDB::GetAllTimestampedSnapshots( std::vector<std::shared_ptr<const Snapshot>>& snapshots) const; // Return timestamped snapshots whose timestamps fall in [ts_lb, ts_ub) and store them in `snapshots`. Status TransactionDB::GetTimestampedSnapshots( TxnTimestamp ts_lb, TxnTimestamp ts_ub, std::vector<std::shared_ptr<const Snapshot>>& snapshots) const; ``` To prevent the number of timestamped snapshots from growing infinitely, we provide the following API to release timestamped snapshots whose timestamps are older than or equal to a given threshold. ```cpp void TransactionDB::ReleaseTimestampedSnapshotsOlderThan(TxnTimestamp ts); ``` Before shutdown, RocksDB will release all timestamped snapshots. Comparison with user-defined timestamp and how they can be combined: User-defined timestamp persists every key with a timestamp, while timestamped snapshots maintain a volatile mapping between snapshots (sequence numbers) and timestamps. Different internal keys with the same user key but different timestamps will be treated as different by compaction, thus a newer version will not hide older versions (with smaller timestamps) unless they are eligible for garbage collection. In contrast, taking a timestamped snapshot at a certain sequence number and timestamp prevents all the keys visible in this snapshot from been dropped by compaction. Here, visible means (seq < snapshot and most recent). The timestamped snapshot supports the semantics of reading at an exact point in time. Timestamped snapshots can also be used with user-defined timestamp. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9879 Test Plan: ``` make check TEST_TMPDIR=/dev/shm make crash_test_with_txn ``` Reviewed By: siying Differential Revision: D35783919 Pulled By: riversand963 fbshipit-source-id: 586ad905e169189e19d3bfc0cb0177a7239d1bd4 |
3 years ago |
|
Yu Zhang
|
a101c9de60 |
Return "invalid argument" when read timestamp is too old (#10109)
Summary: With this change, when a given read timestamp is smaller than the column-family's full_history_ts_low, Get(), MultiGet() and iterators APIs will return Status::InValidArgument(). Test plan ``` $COMPILE_WITH_ASAN=1 make -j24 all $./db_with_timestamp_basic_test --gtest_filter=DBBasicTestWithTimestamp.UpdateFullHistoryTsLow $ make -j24 check ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/10109 Reviewed By: riversand963 Differential Revision: D36901126 Pulled By: jowlyzhang fbshipit-source-id: 255feb1a66195351f06c1d0e42acb1ff74527f86 |
3 years ago |
|
Yanqin Jin
|
3e02c6e05a |
Point-lookup returns timestamps of Delete and SingleDelete (#10056)
Summary: If caller specifies a non-null `timestamp` argument in `DB::Get()` or a non-null `timestamps` in `DB::MultiGet()`, RocksDB will return the timestamps of the point tombstones. Note: DeleteRange is still unsupported. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10056 Test Plan: make check Reviewed By: ltamasi Differential Revision: D36677956 Pulled By: riversand963 fbshipit-source-id: 2d7af02cc7237b1829cd269086ea895a49d501ae |
3 years ago |
|
Jay Zhuang
|
0adac6f88e |
Deflake Transaction stress tests (#10063)
Summary: TSAN test is slower, for `TransactionStressTest` and `DeadlockStress`, they're reaching the timeout limit of 600 seconds. Decreasing the transaction test number. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10063 Test Plan: CI Reviewed By: ajkr Differential Revision: D36711727 Pulled By: jay-zhuang fbshipit-source-id: 600f82a6d32108f52fbe5572fcc7497607b7fe98 |
3 years ago |
|
XieJiSS
|
8b1df101da |
fix: build on risc-v (#9215)
Summary:
Patch is modified from ~~https://reviews.llvm.org/file/data/du5ol5zctyqw53ma7dwz/PHID-FILE-knherxziu4tl4erti5ab/file~~
Tested on Arch Linux riscv64gc (qemu)
UPDATE: Seems like the above link is broken, so I tried to search for a link pointing to the original merge request. It turned out to me that the LLVM guys are cherry-picking from `google/benchmark`, and the upstream should be this:
|
3 years ago |
|
mrambacher
|
b11ff347b4 |
Use STATIC_AVOID_DESTRUCTION for static objects with non-trivial destructors (#9958)
Summary: Changed the static objects that had non-trivial destructors to use the STATIC_AVOID_DESTRUCTION construct. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9958 Reviewed By: pdillinger Differential Revision: D36442982 Pulled By: mrambacher fbshipit-source-id: 029d47b1374d30d198bfede369a4c0ae7a4eb519 |
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 |
|
Yanqin Jin
|
2b5df21e95 |
Remove ifdef for try_emplace after upgrading to c++17 (#9932)
Summary: Test plan make check Pull Request resolved: https://github.com/facebook/rocksdb/pull/9932 Reviewed By: ajkr Differential Revision: D36085404 Pulled By: riversand963 fbshipit-source-id: 2ece14ca0e2e4c1288339ff79e7e126b76eaf786 |
3 years ago |
|
Yanqin Jin
|
2b5c29f9f3 |
Enforce the contract of SingleDelete (#9888)
Summary: Enforce the contract of SingleDelete so that they are not mixed with Delete for the same key. Otherwise, it will lead to undefined behavior. See https://github.com/facebook/rocksdb/wiki/Single-Delete#notes. Also fix unit tests and write-unprepared. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9888 Test Plan: make check Reviewed By: ajkr Differential Revision: D35837817 Pulled By: riversand963 fbshipit-source-id: acd06e4dcba8cb18df92b44ed18c57e10e5a7635 |
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 |
|
Yanqin Jin
|
94e245a14d |
Improve stress test for MultiOpsTxnsStressTest (#9829)
Summary: Adds more coverage to `MultiOpsTxnsStressTest` with a focus on write-prepared transactions. 1. Add a hack to manually evict commit cache entries. We currently cannot assign small values to `wp_commit_cache_bits` because it requires a prepared transaction to commit within a certain range of sequence numbers, otherwise it will throw. 2. Add coverage for commit-time-write-batch. If write policy is write-prepared, we need to set `use_only_the_last_commit_time_batch_for_recovery` to true. 3. After each flush/compaction, verify data consistency. This is possible since data size can be small: default numbers of primary/secondary keys are just 1000. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9829 Test Plan: ``` TEST_TMPDIR=/dev/shm/rocksdb_crashtest_blackbox/ make blackbox_crash_test_with_multiops_wp_txn ``` Reviewed By: pdillinger Differential Revision: D35806678 Pulled By: riversand963 fbshipit-source-id: d7fde7a29fda0fb481a61f553e0ca0c47da93616 |
3 years ago |
|
Herman Lee
|
d9d456de49 |
Fix locktree accesses to PessimisticTransactions (#9898)
Summary: The current locktree implementation stores the address of the PessimisticTransactions object as the TXNID. However, when a transaction is blocked on a lock, it records the list of waitees with conflicting locks using the rocksdb assigned TransactionID. This is performed by calling GetID() on PessimisticTransactions objects of the waitees, and then recorded in the waiter's list. However, there is no guarantee the objects are valid when recording the waitee list during the conflict callbacks because the waitee could have released the lock and freed the PessimisticTransactions object. The waitee/txnid values are only valid PessimisticTransaction objects while the mutex for the root of the locktree is held. The simplest fix for this problem is to use the address of the PessimisticTransaction as the TransactionID so that it is consistent with its usage in the locktree. The TXNID is only converted back to a PessimisticTransaction for the report_wait callbacks. Since these callbacks are now all made within the critical section where the lock_request queue mutx is held, these conversions will be safe. Otherwise, only the uint64_t TXNID of the waitee is registerd with the waiter transaction. The PessimisitcTransaction object of the waitee is never referenced. The main downside of this approach is the TransactionID will not change if the PessimisticTransaction object is reused for new transactions. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9898 Test Plan: Add a new test case and run unit tests. Also verified with MyRocks workloads using range locks that the crash no longer happens. Reviewed By: riversand963 Differential Revision: D35950376 Pulled By: hermanlee fbshipit-source-id: 8c9cae272e23e487fc139b6a8ed5b8f8f24b1570 |
3 years ago |
|
Yanqin Jin
|
d13825e586 |
Add rollback_deletion_type_callback to TxnDBOptions (#9873)
Summary:
This PR does not affect write-committed.
Add a member, `rollback_deletion_type_callback` to TransactionDBOptions
so that a write-prepared transaction, when rolling back, can call this
callback to decide if a `Delete` or `SingleDelete` should be used to
cancel a prior `Put` written to the database during prepare phase.
The purpose of this PR is to prevent mixing `Delete` and `SingleDelete`
for the same key, causing undefined behaviors. Without this PR, the
following can happen:
```
// The application always issues SingleDelete when deleting keys.
txn1->Put('a');
txn1->Prepare(); // writes to memtable and potentially gets flushed/compacted to Lmax
txn1->Rollback(); // inserts DELETE('a')
txn2->Put('a');
txn2->Commit(); // writes to memtable and potentially gets flushed/compacted
```
In the database, we may have
```
L0: [PUT('a', s=100)]
L1: [DELETE('a', s=90)]
Lmax: [PUT('a', s=0)]
```
If a compaction compacts L0 and L1, then we have
```
L1: [PUT('a', s=100)]
Lmax: [PUT('a', s=0)]
```
If a future transaction issues a SingleDelete, we have
```
L0: [SD('a', s=110)]
L1: [PUT('a', s=100)]
Lmax: [PUT('a', s=0)]
```
Then, a compaction including L0, L1 and Lmax leads to
```
Lmax: [PUT('a', s=0)]
```
which is incorrect.
Similar bugs reported and addressed in
https://github.com/cockroachdb/pebble/issues/1255. Based on our team's
current priority, we have decided to take this approach for now. We may
come back and revisit in the future.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9873
Test Plan: make check
Reviewed By: ltamasi
Differential Revision: D35762170
Pulled By: riversand963
fbshipit-source-id: b28d56eefc786b53c9844b9ef4a7807acdd82c8d
|
3 years ago |
|
Peter Dillinger
|
efd035164b |
Meta-internal folly integration with F14FastMap (#9546)
Summary: Especially after updating to C++17, I don't see a compelling case for *requiring* any folly components in RocksDB. I was able to purge the existing hard dependencies, and it can be quite difficult to strip out non-trivial components from folly for use in RocksDB. (The prospect of doing that on F14 has changed my mind on the best approach here.) But this change creates an optional integration where we can plug in components from folly at compile time, starting here with F14FastMap to replace std::unordered_map when possible (probably no public APIs for example). I have replaced the biggest CPU users of std::unordered_map with compile-time pluggable UnorderedMap which will use F14FastMap when USE_FOLLY is set. USE_FOLLY is always set in the Meta-internal buck build, and a simulation of that is in the Makefile for public CI testing. A full folly build is not needed, but checking out the full folly repo is much simpler for getting the dependency, and anything else we might want to optionally integrate in the future. Some picky details: * I don't think the distributed mutex stuff is actually used, so it was easy to remove. * I implemented an alternative to `folly::constexpr_log2` (which is much easier in C++17 than C++11) so that I could pull out the hard dependencies on `ConstexprMath.h` * I had to add noexcept move constructors/operators to some types to make F14's complainUnlessNothrowMoveAndDestroy check happy, and I added a macro to make that easier in some common cases. * Updated Meta-internal buck build to use folly F14Map (always) No updates to HISTORY.md nor INSTALL.md as this is not (yet?) considered a production integration for open source users. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9546 Test Plan: CircleCI tests updated so that a couple of them use folly. Most internal unit & stress/crash tests updated to use Meta-internal latest folly. (Note: they should probably use buck but they currently use Makefile.) Example performance improvement: when filter partitions are pinned in cache, they are tracked by PartitionedFilterBlockReader::filter_map_ and we can build a test that exercises that heavily. Build DB with ``` TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks=fillrandom -num=10000000 -disable_wal=1 -write_buffer_size=30000000 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -partition_index_and_filters ``` and test with (simultaneous runs with & without folly, ~20 times each to see convergence) ``` TEST_TMPDIR=/dev/shm/rocksdb ./db_bench_folly -readonly -use_existing_db -benchmarks=readrandom -num=10000000 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -partition_index_and_filters -duration=40 -pin_l0_filter_and_index_blocks_in_cache ``` Average ops/s no folly: 26229.2 Average ops/s with folly: 26853.3 (+2.4%) Reviewed By: ajkr Differential Revision: D34181736 Pulled By: pdillinger fbshipit-source-id: ffa6ad5104c2880321d8a1aa7187e00ab0d02e94 |
3 years ago |
|
Yanqin Jin
|
1a1c5bda23 |
Disallow commit-time-batch for write-prepared/write-unprepared txn conditionally (#9794)
Summary: For write-prepared/write-unprepared transactions, GetCommitTimeWriteBatch() can be used only if the transaction is started with `TransactionOptions::use_only_the_last_commit_time_batch_for_recovery` set to true. Otherwise, it is possible that multiple uncommitted versions of the same key exist in the database. During bottommost compaction, RocksDB may set the sequence numbers of both to zero once they become committed, causing output SST file to have two identical internal keys. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9794 Test Plan: make check pay special attention to the following ``` transaction_test --gtest_filter=MySQLStyleTransactionTest/MySQLStyleTransactionTest.TransactionStressTest/* ``` Reviewed By: lth Differential Revision: D35327214 Pulled By: riversand963 fbshipit-source-id: 3bae00a28359c10e96e4c6f676d20de5610d8a0f |
3 years ago |
|
Yanqin Jin
|
565fcead22 |
Fix clang-analyze by adding assertion (#9682)
Summary: Clang-analyze complains about potential nullptr dereference. Fix by adding an assertion to make clang happy. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9682 Test Plan: USE_CLANG=1 make -j20 analyze_incremental Reviewed By: ltamasi Differential Revision: D34755210 Pulled By: riversand963 fbshipit-source-id: 948e1899846ee1aa05a1b500a11ff43b0b412e0a |
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 |
|
Yanqin Jin
|
6f12599863 |
Support WBWI for keys having timestamps (#9603)
Summary: This PR supports inserting keys to a `WriteBatchWithIndex` for column families that enable user-defined timestamps and reading the keys back. **The index does not have timestamps.** Writing a key to WBWI is unchanged, because the underlying WriteBatch already supports it. When reading the keys back, we need to make sure to distinguish between keys with and without timestamps before comparison. When user calls `GetFromBatchAndDB()`, no timestamp is needed to query the batch, but a timestamp has to be provided to query the db. The assumption is that data in the batch must be newer than data from the db. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9603 Test Plan: make check Reviewed By: ltamasi Differential Revision: D34354849 Pulled By: riversand963 fbshipit-source-id: d25d1f84e2240ce543e521fa30595082fb8db9a0 |
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 |
|
Yanqin Jin
|
241b5aa15a |
Timestamp-based validation for pessimistic txn (#9562)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9562 With per-transaction `read_timestamp_`, it is possible to perform transaction validation after locking a key in addition to sequence-based validation. Specifically, if a transaction has a read_timestamp, then we perform timestamp-based validation as well after the key is locked via `GetForUpdate()`. This is to make sure that no other transaction has modified the key and committed successfully since the read timestamp (but before the locking operation) which represents a consistent view of the database. Reviewed By: ltamasi Differential Revision: D31822034 fbshipit-source-id: c6f1828b7fc23e4f85e2d1ed73ff51464a058d91 |
3 years ago |
|
Yanqin Jin
|
d6e1e6f37a |
Add commit_timestamp and read_timestamp to Pessimistic transaction (#9537)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9537 Add `Transaction::SetReadTimestampForValidation()` and `Transaction::SetCommitTimestamp()` APIs with default implementation returning `Status::NotSupported()`. Currently, calling these two APIs do not have any effect. Also add checks to `PessimisticTransactionDB` to enforce that column families in the same db either - disable user-defined timestamp - enable 64-bit timestamp Just to clarify, a `PessimisticTransactionDB` can have some column families without timestamps as well as column families that enable timestamp. Each `PessimisticTransaction` can have two optional timestamps, `read_timestamp_` used for additional validation and `commit_timestamp_` which denotes when the transaction commits. For now, we are going to support `WriteCommittedTxn` (in a series of subsequent PRs) Once set, we do not allow decreasing `read_timestamp_`. The `commit_timestamp_` must be greater than `read_timestamp_` for each transaction and must be set before commit, unless the transaction does not involve any column family that enables user-defined timestamp. TransactionDB builds on top of RocksDB core `DB` layer. Though `DB` layer assumes that user-defined timestamps are byte arrays, `TransactionDB` uses uint64_t to store timestamps. When they are passed down, they are still interpreted as byte-arrays by `DB`. Reviewed By: ltamasi Differential Revision: D31567959 fbshipit-source-id: b0b6b69acab5d8e340cf174f33e8b09f1c3d3502 |
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 |
|
Sergei Petrunia
|
c9042db619 |
Range Locking: add support for escalation barriers (#9290)
Summary: Range Locking supports Lock Escalation. Lock Escalation is invoked when lock memory is nearly exhausted and it reduced the amount of memory used by joining adjacent locks. Bridging the gap between certain locks has adverse effects. For example, in MyRocks it is not a good idea to bridge the gap between locks in different indexes, as that get the lock to cover large portions of indexes, or even entire indexes. Resolve this by introducing Escalation Barrier. The escalation process will call the user-provided barrier callback function: bool(const Endpoint& a, const Endpoint& b) If the function returns true, there's a barrier between a and b and Lock Escalation will not try to bridge the gap between a and b. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9290 Reviewed By: akankshamahajan15 Differential Revision: D33486753 Pulled By: riversand963 fbshipit-source-id: f97910b67aba0579ea1d35f523ca6863d3dd018e |
3 years ago |
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Yanqin Jin
|
0376869f05 |
Remove using namespace (#9369)
Summary: As title. This is part of an fb-internal task. First, remove all `using namespace` statements if applicable. Next, utilize multiple build platforms and see if anything is broken. Should anything become broken, fix the compilation errors with as little extra change as possible. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9369 Test Plan: internal build and make check make clean && make static_lib && cd examples && make all Reviewed By: pdillinger Differential Revision: D33517260 Pulled By: riversand963 fbshipit-source-id: 3fc4ce6402a073421dfd9a9b2d1c79441dca7a40 |
3 years ago |
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Sergei Petrunia
|
1b076e82db |
Expose locktree's wait count in RangeLockManagerHandle::Counters (#9289)
Summary: locktree is a module providing Range Locking. It has a counter for the number of times a lock acquisition request was blocked by an existing conflicting lock and had to wait for it to be released. Expose this counter in RangeLockManagerHandle::Counters::lock_wait_count. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9289 Reviewed By: jay-zhuang Differential Revision: D33079182 Pulled By: riversand963 fbshipit-source-id: 25b1a362d9da247536ab5007bd15900b319f139e |
3 years ago |
|
Hui Xiao
|
cd85439632 |
Make TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAcces less flaky (#9281)
Summary: Context: [Rapid thread creation and deletion](https://github.com/facebook/rocksdb/blob/6.27.fb/utilities/transactions/write_prepared_transaction_test.cc#L439-L444) in `SnapshotConcurrentAccessTest.SnapshotConcurrentAcces` inside a [potentially big loop](https://github.com/facebook/rocksdb/blob/6.27.fb/utilities/transactions/write_prepared_transaction_test.cc#L1238-L1248) can lead to heavy-loading the system with many threads due to delay in actually cleaning up thread's resource in the kernel sometime. We ran into some [flaky failure](https://app.circleci.com/pipelines/github/facebook/rocksdb/10383/workflows/136f1005-80a9-4515-aee9-fe36ac6462a1/jobs/253289) in CI and reproduced it by below: - Command ``` Added `ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();` like https://github.com/facebook/rocksdb/pull/9276 DEBUG_LEVEL=2 make -j56 write_prepared_transaction_test GTEST_CATCH_EXCEPTIONS=0 ~/gtest-parallel/gtest-parallel -r 200 -w 200 ./write_prepared_transaction_test --gtest_filter=TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 ``` - Stack, where `write_prepared_transaction_test.cc:442` in `https://github.com/facebook/rocksdb/issues/9` points to thread creation ``` [ RUN ] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 ....terminate called after throwing an instance of 'std::system_error' what(): Resource temporarily unavailable Received signal 6 (Aborted) #0 /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38) [0x7fc114f39438] ... https://github.com/facebook/rocksdb/issues/7 /usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0xb8e73) [0x7fc1158a5e73] ?? ??:0 https://github.com/facebook/rocksdb/issues/8 ./write_prepared_transaction_test() [0x4ca86c] std:🧵:thread<rocksdb::WritePreparedTransactionTestBase::SnapshotConcurrentAccessTestInternal(rocksdb::WritePreparedTxnDB*, std::vector<unsigned long, std::allocator<unsigned long> > const&, std::vector<unsigned long, std::allocator<unsigned long> const&, rocksdb::WritePreparedTxnDB::CommitEntry&, unsigned long&, unsigned long, unsigned long, unsigned long, unsigned long)::{lambda()https://github.com/facebook/rocksdb/issues/1}>(rocksdb::WritePreparedTransactionTestBase::SnapshotConcurrentAccessTestInternal(rocksdb::WritePreparedTxnDB*, s d::vector<unsigned long, std::allocator<unsigned long> > const&, std::vector<unsigned long, std::allocator<unsigned long> > const&, rocksdb::WritePreparedTxnDB::CommitEntry&, unsigned long&, unsigned long, unsigned long, unsigned long, unsigned long)::{l mbda()https://github.com/facebook/rocksdb/issues/1}&&) /usr/include/c++/5/thread:137 (discriminator 4) https://github.com/facebook/rocksdb/issues/9 ./write_prepared_transaction_test() [0x4bb80c] rocksdb::WritePreparedTransactionTestBase::SnapshotConcurrentAccessTestInternal(rocksdb::WritePreparedTxnDB*, std::vector<unsigned long, std::allocator<unsigned long> > const&, std::vector<unsigned long, std::allocator<unsigned long> > const&, rocksdb::W itePreparedTxnDB::CommitEntry&, unsigned long&, unsigned long, unsigned long, unsigned long, unsigned long) /home/circleci/project/utilities/transactions/write_prepared_transaction_test.cc:442 https://github.com/facebook/rocksdb/issues/10 ./write_prepared_transaction_test() [0x4407b6] rocksdb::SnapshotConcurrentAccessTest_SnapshotConcurrentAccess_Test::TestBody() /home/circleci/project/utilities/transactions/write_prepared_transaction_test.cc:1244 ... [109/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 returned/aborted with exit code -6 (34462 ms) ``` - Move thread 2's work into current thread to avoid half of the thread creation cuz there is no difference in doing so. We expect this can make the thread-creation error less often, even though we can't gurantee it from happening again. Considering this is a trivial change with positive impact, it's still worth landing and monitor if it's enough to solve the problem in reality. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9281 Test Plan: Before the change, repeating the test 200 times with 200 workers failed `~/gtest-parallel/gtest-parallel -r 200 -w 200 ./write_prepared_transaction_test --gtest_filter=TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1` ``` [==========] Running 1 test from 1 test case. [----------] Global test environment set-up. [----------] 1 test from TwoWriteQueues/SnapshotConcurrentAccessTest [ RUN ] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 ..unknown file: Failure C++ exception with description "Resource temporarily unavailable" thrown in the test body. [ FAILED ] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1, where GetParam() = (false, true, 1, 0, 1, 20) (11882 ms) [----------] 1 test from TwoWriteQueues/SnapshotConcurrentAccessTest (11882 ms total) [----------] Global test environment tear-down [==========] 1 test from 1 test case ran. (11882 ms total) [ PASSED ] 0 tests. [ FAILED ] 1 test, listed below: [ FAILED ] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1, where GetParam() = (false, true, 1, 0, 1, 20) ``` After the change: repeating the test 200 times with 200 workers didn't fail, even with repeating the "repeating" for 10 times like below `for i in {1..10}; do ~/gtest-parallel/gtest-parallel -r 200 -w 200 ./write_prepared_transaction_test --gtest_filter=TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1; done` ``` [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [200/200] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 ``` It does failed when repeating the test 400 times with 400 workers `~/project$ ~/gtest-parallel/gtest-parallel -r 400 -w 400 ./write_prepared_transaction_test --gtest_filter=TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1` ``` [1/400] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 (2928 ms) Note: Google Test filter = TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 [==========] Running 1 test from 1 test case. [----------] Global test environment set-up. [----------] 1 test from TwoWriteQueues/SnapshotConcurrentAccessTest [ RUN ] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1 unknown file: Failure C++ exception with description "std::bad_alloc" thrown in the test body. [ FAILED ] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/1, where GetParam() = (false, true, 1, 0, 1, 20) (2597 ms) [----------] 1 test from TwoWriteQueues/SnapshotConcurrentAccessTest (2597 ms total) ``` Reviewed By: ajkr Differential Revision: D33026776 Pulled By: hx235 fbshipit-source-id: 509f57126392821e835e48396e5bf224f4f5dcac |
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 |
|
Peter Dillinger
|
aec95b8c09 |
Debug "Resource temporarily unavailable" exception in CircleCI (#9276)
Summary:
This changes write_prepared_transaction_test under CircleCI to
print a stack trace on unhandled exception, so that we can debug rare
exceptions seen in CircleCI:
[ RUN ] TwoWriteQueues/SnapshotConcurrentAccessTest.SnapshotConcurrentAccess/24
.......unknown file: Failure
C++ exception with description "Resource temporarily unavailable" thrown in the test body.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9276
Test Plan:
manual run test with seeded 'throw', with and without
CIRCLECI=true environment variable
Reviewed By: ajkr, hx235
Differential Revision: D32996993
Pulled By: pdillinger
fbshipit-source-id: e790408ce204b676d3d84a290e41be511b203bfa
|
3 years ago |
|
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 |
|
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 |