Summary:
New memory technologies are being developed by various hardware vendors (Intel DCPMM is one such technology currently available). These new memory types require different libraries for allocation and management (such as PMDK and memkind). The high capacities available make it possible to provision large caches (up to several TBs in size), beyond what is achievable with DRAM.
The new allocator provided in this PR uses the memkind library to allocate memory on different media.
**Performance**
We tested the new allocator using db_bench.
- For each test, we vary the size of the block cache (relative to the size of the uncompressed data in the database).
- The database is filled sequentially. Throughput is then measured with a readrandom benchmark.
- We use a uniform distribution as a worst-case scenario.
The plot shows throughput (ops/s) relative to a configuration with no block cache and default allocator.
For all tests, p99 latency is below 500 us.
**Changes**
- Add MemkindKmemAllocator
- Add --use_cache_memkind_kmem_allocator db_bench option (to create an LRU block cache with the new allocator)
- Add detection of memkind library with KMEM DAX support
- Add test for MemkindKmemAllocator
**Minimum Requirements**
- kernel 5.3.12
- ndctl v67 - https://github.com/pmem/ndctl
- memkind v1.10.0 - https://github.com/memkind/memkind
**Memory Configuration**
The allocator uses the MEMKIND_DAX_KMEM memory kind. Follow the instructions on[ memkind’s GitHub page](https://github.com/memkind/memkind) to set up NVDIMM memory accordingly.
Note on memory allocation with NVDIMM memory exposed as system memory.
- The MemkindKmemAllocator will only allocate from NVDIMM memory (using memkind_malloc with MEMKIND_DAX_KMEM kind).
- The default allocator is not restricted to RAM by default. Based on NUMA node latency, the kernel should allocate from local RAM preferentially, but it’s a kernel decision. numactl --preferred/--membind can be used to allocate preferentially/exclusively from the local RAM node.
**Usage**
When creating an LRU cache, pass a MemkindKmemAllocator object as argument.
For example (replace capacity with the desired value in bytes):
```
#include "rocksdb/cache.h"
#include "memory/memkind_kmem_allocator.h"
NewLRUCache(
capacity /*size_t*/,
6 /*cache_numshardbits*/,
false /*strict_capacity_limit*/,
false /*cache_high_pri_pool_ratio*/,
std::make_shared<MemkindKmemAllocator>());
```
Refer to [RocksDB’s block cache documentation](https://github.com/facebook/rocksdb/wiki/Block-Cache) to assign the LRU cache as block cache for a database.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6214
Reviewed By: cheng-chang
Differential Revision: D19292435
fbshipit-source-id: 7202f47b769e7722b539c86c2ffd669f64d7b4e1
Summary:
https://github.com/facebook/rocksdb/pull/6668 added some new test code but it has a risk of memory corruption. Fix it
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6676
Test Plan: Run the test under ASAN and see it passes.
Reviewed By: ajkr
Differential Revision: D20937108
fbshipit-source-id: 22cc96bb02030df0a37a02e67a2cc37ca31ba22d
Summary:
Although these optimizations are not user facing, still feel it's valuable to call out in HISTORY.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6679
Test Plan: no need
Reviewed By: zhichao-cao
Differential Revision: D20945916
Pulled By: cheng-chang
fbshipit-source-id: f3e790c07f3bcc4a8a74246c4fa232800ddd4438
Summary:
On reading an ingested SST file, `DataBlockIter` will replace seqno encoded in a key with global seqno. However, if the original seqno was part of the prefix used for the next key, the global seqno is by mistake used as part of the prefix to construct the next key, causing wrong result being returned. Although at this point it is only software error while data in the file is not corrupted, the issue can further cause compaction output out of order and corrupted result when the ingested SST participated in compaction. Fixing the issue by save the actual seqno and restore it before the key being used as prefix to construct next key.
The unit test is by Little-Wallace from https://github.com/facebook/rocksdb/issues/6666. Fixing https://github.com/facebook/rocksdb/issues/6666.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6669
Test Plan:
New unit test
Signed-off-by: Yi Wu <yiwu@pingcap.com>
Reviewed By: cheng-chang
Differential Revision: D20931808
Pulled By: ajkr
fbshipit-source-id: f01959c35d6a493954dca981663766c7a5a9e8ab
Summary:
When aligned_buf is provided, the result slice's starting address should take offset advance into account.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6672
Test Plan: make check
Reviewed By: anand1976
Differential Revision: D20934198
Pulled By: cheng-chang
fbshipit-source-id: c3475c9c132b92c50d8c7c399fca2e9e76870803
Summary:
Source code path in info log is not truncated to the correct length. Fixing it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5824
Test Plan:
Build and run db_bench. Before:
```
2019/09/18-21:32:34.631181 7fdd42df6700 [_impl/db_impl_write.cc:1654] [default] New memtable created with log file: https://github.com/facebook/rocksdb/issues/9. Immutable memtables: 0.
```
After:
```
2019/09/18-21:36:09.226532 7f141b5f6700 [/db_impl/db_impl_write.cc:1654] [default] New memtable created with log file: https://github.com/facebook/rocksdb/issues/9. Immutable memtables: 0.
```
Reviewed By: cheng-chang
Differential Revision: D17511851
fbshipit-source-id: b2f92c85ce78726c27b7e0e736657fe2f983513e
Summary:
… to CFOptions
https://github.com/facebook/rocksdb/pull/6615 made several compression related options dynamically changeable. They are moved to MutableCFOptions. However, they are not copied back to ColumnFamilyOptions, so the changed values are not written to option files and for some other uses. Fix it by copying them back.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6668
Test Plan: Add a unit test to make sure that when a MutableCFOptions is converted to CFOptions and back to MutableCFOptions, they stay the same. This test would fail without the fix.
Reviewed By: ajkr
Differential Revision: D20923999
fbshipit-source-id: c3bccd6923b00d677764e2269bed6a95ad7ed780
Summary:
This commit is fixing a bug that readrandom test returns many NotFound in db_bench from Version 6.2.
Pull Request resolved: https://github.com/facebook/rocksdb/issues/6664
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6665
Reviewed By: cheng-chang
Differential Revision: D20911298
Pulled By: ajkr
fbshipit-source-id: c2658d4dbb35798ccbf67dff6e64923fb731ef81
Summary:
Although there are tests related to locking in transaction_test, this new test directly tests against TransactionLockMgr.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6599
Test Plan: make transaction_lock_mgr_test && ./transaction_lock_mgr_test
Reviewed By: lth
Differential Revision: D20673749
Pulled By: cheng-chang
fbshipit-source-id: 1fa4a13218e68d785f5a99924556751a8c5c0f31
Summary:
This change is fixing a crash happening in getApproximateSizes JNI implementation. It also reenables Java test that was crashing most likelly because if this bug.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6652
Reviewed By: cheng-chang
Differential Revision: D20874865
Pulled By: pdillinger
fbshipit-source-id: da95516f15e5df2efe1a4e5690a2ce172cb53f87
Summary:
Adding a Java API for rocksdb::CancelAllBackgroundWork() so that the user can call this (when required) before closing the DB. This is to **prevent the crashes when manual compaction is running and the user decides to close the DB**.
Calling CancelAllBackgroundWork() seems to be the recommended way to make sure that it's safe to close the DB (according to RocksDB FAQ: https://github.com/facebook/rocksdb/wiki/RocksDB-FAQ#basic-readwrite).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6657
Reviewed By: cheng-chang
Differential Revision: D20896395
Pulled By: pdillinger
fbshipit-source-id: 8a8208c10093db09bd35db9af362211897870d96
Summary:
It was incorrectly counting time even for blocks that didn't need decompression.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6658
Test Plan: make check
Reviewed By: ajkr
Differential Revision: D20883522
Pulled By: anand1976
fbshipit-source-id: 33c9c4683f54cad150ab260a69e3ef8aa9aff76a
Summary:
Adding a simple timer support to schedule work at a fixed time.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6543
Test Plan: TODO: clean up the unit tests, and make them better.
Reviewed By: siying
Differential Revision: D20465390
Pulled By: sagar0
fbshipit-source-id: cba143f70b6339863e1d0f8b8bf92e51c2b3d678
Summary:
The raw key bytes are currently dumped directly into the log messages,
which is not ideal if the keys aren't ASCII strings. Null bytes in
particular can cut off bits of the message early.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6616
Reviewed By: ajkr
Differential Revision: D20879218
Pulled By: anand1976
fbshipit-source-id: 825a20715fe6d8012c0163c6e7b8159f7926a1a7
Summary:
When Travis times out, it's hard to determine whether
the last executing thing took an excessively long time or the
sum of all the work just exceeded the time limit. This
change inserts some timestamps in the output that should
make this easier to determine.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6643
Test Plan: CI (Travis mostly)
Reviewed By: anand1976
Differential Revision: D20843901
Pulled By: pdillinger
fbshipit-source-id: e7aae5434b0c609931feddf238ce4355964488b7
Summary:
https://github.com/facebook/rocksdb/pull/6262 causes CLANG analyze to complain. Add assertion to suppress the warning.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6641
Test Plan: Run "clang analyze" and make sure it passes.
Reviewed By: anand1976
Differential Revision: D20841722
fbshipit-source-id: 5fa6e0c5cfe7a822214c9b898a408df59d4fd2cd
Summary:
This is a predecessor to the Configurable PR. This change moves the OptionTypeInfo maps closer to where they will be used.
When the Configurable changes are adopted, these values will become static and not associated with the OptionsHelper.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6198
Reviewed By: siying
Differential Revision: D20778108
Pulled By: zhichao-cao
fbshipit-source-id: a9f85fc73bc53503656e1958ecc1e764052fd1aa
Summary:
I suspect LRUCache could use some optimization, and to support
such an effort, a good benchmarking tool is needed. The existing
cache_bench was heavily skewed toward insertion and lookup misses, and
did not saturate memory with other work. This change should improve
those things to better resemble a real workload.
(All below using clang compiler, for some consistency, but not
necessarily same version and settings.)
The real workload is from production MySQL on RocksDB, filtering stacks
containing "LRU", "ShardedCache" or "CacheShard."
Lookup inclusive: 66%
Insert inclusive: 17%
Release inclusive: 15%
An alternate simulated workload is MySQL running a LinkBench read test:
Lookup inclusive: 54%
Insert inclusive: 24%
Release inclusive: 21%
cache_bench default settings, prior to this change:
Lookup inclusive: 35.8%
Insert inclusive: 63.6%
Release inclusive: 0%
cache_bench after this change (intended as somewhat "tighter" workload
than average production, more like LinkBench):
Lookup inclusive: 52%
Insert inclusive: 20%
Release inclusive: 26%
And top exclusive stacks (portion of stack samples as filtered above):
Production MySQL:
LRUHandleTable::FindPointer: 25.3%
rocksdb::operator==: 15.1% <-- Slice ==
LRUCacheShard::LRU_Remove: 13.8%
ShardedCache::Lookup: 8.9%
__pthread_mutex_lock: 7.1%
LRUCacheShard::LRU_Insert: 6.3%
MurmurHash64A: 4.8% <-- Since upgraded to XXH3p
...
Old cache_bench:
LRUHandleTable::FindPointer: 23.6%
__pthread_mutex_lock: 15.0%
__pthread_mutex_unlock_usercnt: 11.7%
__lll_lock_wait: 8.6%
__lll_unlock_wake: 6.8%
LRUCacheShard::LRU_Insert: 6.0%
ShardedCache::Lookup: 4.4%
LRUCacheShard::LRU_Remove: 2.8%
...
rocksdb::operator==: 0.2% <-- Slice ==
...
New cache_bench:
LRUHandleTable::FindPointer: 22.8%
__pthread_mutex_unlock_usercnt: 14.3%
rocksdb::operator==: 10.5% <-- Slice ==
LRUCacheShard::LRU_Insert: 9.0%
__pthread_mutex_lock: 5.9%
LRUCacheShard::LRU_Remove: 5.0%
...
ShardedCache::Lookup: 2.9%
...
So there's a bit more lock contention in the benchmark than in
production, but otherwise looks similar enough to me. At least it's a
big improvement over the existing code.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6629
Test Plan: No production code changes, ran cache_bench with ASAN
Reviewed By: ltamasi
Differential Revision: D20824318
Pulled By: pdillinger
fbshipit-source-id: 6f8dc5891ead0f87edbed3a615ecd5289d9abe12
Summary:
In CompactionManifestWriteRetryableError in error_handler_fs_test, the manifest write of flush should pass with no fs error. After flush, fs is set to error status and the manifest write of compaction should fail due to the IO Error. Currently, the manifest write of flush is not synced with the compaction in order, which might cause manifest write fails, which will cause test failure. Fixed by adding the LoadDependency of sync-point after flush and before compaction.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6637
Test Plan: pass error_hanlder_fs_tes. Pass make asan_check
Reviewed By: anand1976
Differential Revision: D20826969
Pulled By: zhichao-cao
fbshipit-source-id: fb2e702caa19bd63c82570320536b7acda870ff1
Summary:
With https://github.com/facebook/rocksdb/issues/6262, TSAN complains about data race of some variables. Those variables are used to estimate file size and are accessed in writer and background threads. Since file size estimation doesn't have to be 100% accurate, we make some variables atomic and use relaxed memory order.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6636
Test Plan: Run all tests with TSAN.
Reviewed By: anand1976
Differential Revision: D20820635
fbshipit-source-id: 1ea45ff38be15e33674ffe06b7d42fc9fe161ea5
Summary:
With https://github.com/facebook/rocksdb/issues/6262, UBSAN fails with "division by zero":
[ RUN ] Timestamp/DBBasicTestWithTimestampCompressionSettings.PutAndGetWithCompaction/3
internal_repo_rocksdb/repo/table/block_based/block_based_table_builder.cc:1066:39: runtime error: division by zero
#0 0x7ffb3117b071 in rocksdb::BlockBasedTableBuilder::WriteRawBlock(rocksdb::Slice const&, rocksdb::CompressionType, rocksdb::BlockHandle*, bool) internal_repo_rocksdb/repo/table/block_based/block_based_table_builder.cc:1066
https://github.com/facebook/rocksdb/issues/1 0x7ffb311775e1 in rocksdb::BlockBasedTableBuilder::WriteBlock(rocksdb::Slice const&, rocksdb::BlockHandle*, bool) internal_repo_rocksdb/repo/table/block_based/block_based_table_builder.cc:848
https://github.com/facebook/rocksdb/issues/2 0x7ffb311771a2 in rocksdb::BlockBasedTableBuilder::WriteBlock(rocksdb::BlockBuilder*, rocksdb::BlockHandle*, bool) internal_repo_rocksdb/repo/table/block_based/block_based_table_builder.cc:832
This is caused by not returning immediately after CompressAndVerifyBlock call
in WriteBlock when rep_->status == kBuffered.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6633
Test Plan: Run all existing test.
Reviewed By: anand1976
Differential Revision: D20808366
fbshipit-source-id: 09f24b7c0fbaf4c7a8fc48cac61fa6fcb9b85811
Summary:
Does what it says on the can. Similarly to table files, we need to re-persist
the metadata of live blob files whenever a new manifest file is opened.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6630
Test Plan: `make check`
Reviewed By: riversand963
Differential Revision: D20802126
Pulled By: ltamasi
fbshipit-source-id: 5738692d898790293bf09d66e9997369bbf89566
Summary:
Add `encrypt_data_time` and `decrypt_data_time` perf_context counters to time encryption/decryption time when `EnvEncryption` is enabled.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6596
Test Plan: CI
Reviewed By: anand1976
Differential Revision: D20678617
fbshipit-source-id: 7b57536143aa38509cde011f704de33382169e07
Summary:
This PR adds support for pipelined & parallel compression optimization for `BlockBasedTableBuilder`. This optimization makes block building, block compression and block appending a pipeline, and uses multiple threads to accelerate block compression. Users can set `CompressionOptions::parallel_threads` greater than 1 to enable compression parallelism.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6262
Reviewed By: ajkr
Differential Revision: D20651306
fbshipit-source-id: 62125590a9c15b6d9071def9dc72589c1696a4cb
Summary:
https://github.com/facebook/rocksdb/issues/6247 reports that when write buffer manager fails to insert the dummy entry to block cache, null pointer is still stored and used to release the handle and cause corruption. Fix the bug by not releasing it with null handle.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6619
Test Plan: Add a unit test that fails without the fix.
Reviewed By: ajkr
Differential Revision: D20776769
fbshipit-source-id: 4127fbd9f295a0a3e45774746ffcd91f939f6287
Summary:
These three options should be made dynamically changeable. Simply add them to MutableCFOptions and made the change.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6615
Test Plan: Add a unit test to make sure that SetOptions() can change the options.
Reviewed By: riversand963
Differential Revision: D20755951
fbshipit-source-id: 8165f4fd7a7a665cc7fb049698935022a5d2e7ff
Summary:
For FIFO compaction, we use flush time instead of oldest key time as the
creation time. This is to prevent FIFO compaction dropping files whose oldest
key time is older than TTL but which has newer keys than TTL.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6612
Test Plan: make check
Reviewed By: siying
Differential Revision: D20748217
Pulled By: riversand963
fbshipit-source-id: 3f7b00a847020760537cdddd12f6fe039e5bc663
Summary:
The checksum generator should be released if file_writer fails to reset the pointer.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6611
Test Plan: pass make asan_check
Reviewed By: riversand963
Differential Revision: D20742964
Pulled By: zhichao-cao
fbshipit-source-id: cde41be2edb3d1e56083c2b93e1510fb32556146
Summary:
This change updates PosixSequentialFile::Read to call clearerr()
before fread()ing again after an EINTR is returned on a previous
fread.
The original fix is from bd8f1ebb91.
Fixing https://github.com/facebook/rocksdb/issues/6509
Signed-off-by: phantomape <cxucheng@outlook.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6609
Reviewed By: zhichao-cao
Differential Revision: D20731482
Pulled By: riversand963
fbshipit-source-id: 7f1f3a1449077d5560f45c465a78d08633740ba0
Summary:
In the current implementation, sst file checksum is calculated by a shared checksum function object, which may make some checksum function hard to be applied here such as SHA1. In this implementation, each sst file will have its own checksum generator obejct, created by FileChecksumGenFactory. User needs to implement its own FilechecksumGenerator and Factory to plugin the in checksum calculation method.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6600
Test Plan: tested with make asan_check
Reviewed By: riversand963
Differential Revision: D20717670
Pulled By: zhichao-cao
fbshipit-source-id: 2a74c1c280ac11a07a1980185b43b671acaa71c6
Summary:
When creating a database backup, the background threads will not only consume IO resources by copying files, but also consuming CPU such as by computing checksums. During peak times, the CPU consumption by the background threads might affect online queries.
This PR makes it possible to decrease CPU priority of these threads when creating a new backup.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6602
Test Plan: make check
Reviewed By: siying, zhichao-cao
Differential Revision: D20683216
Pulled By: cheng-chang
fbshipit-source-id: 9978b9ed9488e8ce135e90ca083e5b4b7221fd84
Summary:
1. If expiration_time is non-positive, no need to call NowMicros, save a syscall.
2. expire_time should only be set when expired is false.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6586
Test Plan: make check
Reviewed By: lth
Differential Revision: D20673730
Pulled By: cheng-chang
fbshipit-source-id: a69e8d7b16dc6d0d00487bb1c19f0710d79482e2
Summary:
In the current code base, we use Status to get and store the returned status from the call. Specifically, for IO related functions, the current Status cannot reflect the IO Error details such as error scope, error retryable attribute, and others. With the implementation of https://github.com/facebook/rocksdb/issues/5761, we have the new Wrapper for IO, which returns IOStatus instead of Status. However, the IOStatus is purged at the lower level of write path and transferred to Status.
The first job of this PR is to pass the IOStatus to the write path (flush, WAL write, and Compaction). The second job is to identify the Retryable IO Error as HardError, and set the bg_error_ as HardError. In this case, the DB Instance becomes read only. User is informed of the Status and need to take actions to deal with it (e.g., call db->Resume()).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6487
Test Plan: Added the testing case to error_handler_fs_test. Pass make asan_check
Reviewed By: anand1976
Differential Revision: D20685017
Pulled By: zhichao-cao
fbshipit-source-id: ff85f042896243abcd6ef37877834e26f36b6eb0
Summary:
The last key may hit index of out bound exception when id = 9.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6574
Reviewed By: riversand963
Differential Revision: D20699791
Pulled By: cheng-chang
fbshipit-source-id: 8e2c5be5ff0e53e9857cfd59cea97cff21446819
Summary:
This test was written like a stress test, using up to 3x26GB
RSS memory during parallel 'make check'. Now, while this code is mostly
dormant, I've made the "for Travis" versions of the expensive tests the
canonical versions and disabled the expensive versions. This has the
side benefit of removing some arbitrary conditional compilation.
For unknown reason, the super expensive tests were gated on
Snappy_Supported, which appears to be irrelevant, so I removed it.
The tests can be fixed / improved / migrated to stress test if/when they
are deemed important again.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6601
Test Plan:
make check + CI
./persistent_cache_test Before:
...
[==========] 10 tests from 2 test cases ran. (114541 ms total)
[ PASSED ] 10 tests.
YOU HAVE 1 DISABLED TEST
After:
...
[==========] 3 tests from 2 test cases ran. (1714 ms total)
[ PASSED ] 3 tests.
YOU HAVE 10 DISABLED TESTS
Reviewed By: siying
Differential Revision: D20680983
Pulled By: pdillinger
fbshipit-source-id: 2be0fde13eeb0a71110ac7f5477cfe63996a509e
