rocksdb

Commit Graph

Author	SHA1	Message	Date
Hui Xiao	09882a52d6	Prepare for deprecation of Options::access_hint_on_compaction_start (#11658 ) Summary: Context/Summary: After https://github.com/facebook/rocksdb/pull/11631, file hint is not longer needed for compaction read. Therefore we can deprecate `Options::access_hint_on_compaction_start`. As this is a public API change, we should first mark the relevant APIs (including the Java's) deprecated and remove it in next major release 9.0. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11658 Test Plan: No code change Reviewed By: ajkr Differential Revision: D47997856 Pulled By: hx235 fbshipit-source-id: 16e015ae7728c224b1caef73143aa9915668f4ac	1 year ago
Hui Xiao	629605d645	Move prefetching responsibility to page cache for compaction read under non directIO usecase (#11631 ) Summary: Context/Summary As titled. The benefit of doing so is to explicitly call readahead() instead of relying page cache behavior for compaction read when we know that we most likely need readahead as compaction read is sequential read . Test Extended the existing UT to cover compaction read case Pull Request resolved: https://github.com/facebook/rocksdb/pull/11631 Reviewed By: ajkr Differential Revision: D47681437 Pulled By: hx235 fbshipit-source-id: 78792f64985c4dc44aa8f2a9c41ab3e8bbc0bc90	1 year ago
akankshamahajan	749b179c04	Remove reallocation of AlignedBuffer in direct_io sync reads if already aligned (#11600 ) Summary: Remove reallocation of AlignedBuffer in direct_io sync reads in RandomAccessFileReader::Read if buffer passed is already aligned. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11600 Test Plan: Setup: `TEST_TMPDIR=./tmp-db/ ./db_bench -benchmarks=filluniquerandom -disable_auto_compactions=true -target_file_size_base=1048576 -write_buffer_size=1048576 -compression_type=none` Benchmark: `TEST_TMPDIR=./tmp-db/ perf record ./db_bench --cache_size=8388608 --use_existing_db=true --disable_auto_compactions=true --benchmarks=seekrandom --use_direct_reads=true -use_direct_io_for_flush_and_compaction=true -reads=1000 -seek_nexts=1 -max_auto_readahead_size=131072 -initial_auto_readahead_size=16384 -adaptive_readahead=true -num_file_reads_for_auto_readahead=0` Perf profile- Before: ``` 8.73% db_bench libc.so.6 [.] __memmove_evex_unaligned_erms 3.34% db_bench [kernel.vmlinux] [k] filemap_get_read_batch ``` After: ``` 2.50% db_bench [kernel.vmlinux] [k] filemap_get_read_batch 2.29% db_bench libc.so.6 [.] __memmove_evex_unaligned_erms ``` `make crash_test -j `with direct_io enabled completed succesfully locally. Ran few benchmarks with direct_io from seek_nexts varying between 912 to 327680 and different readahead_size parameters and it showed no regression so far. Reviewed By: ajkr Differential Revision: D47478598 Pulled By: akankshamahajan15 fbshipit-source-id: 6a48e21cb34696f5d09c22a6311a3a1cb5f9cf33	1 year ago
akankshamahajan	ff1cc8a63e	Fix extra prefetching when num_file_reads_for_auto_readahead is 1 in async_io (#11560 ) Summary: When num_file_reads_for_auto_readahead = 1, during seek, it would go for prefetchingextra data in second buffer along with seek data, that would lead to increase in read data and discarded bytes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11560 Test Plan: Added unit test Reviewed By: anand1976 Differential Revision: D47008102 Pulled By: akankshamahajan15 fbshipit-source-id: 566c6131cb5f968d5efb81fd0ab233ff7e534ab0	2 years ago
akankshamahajan	fbd2f563bb	Add an interface to provide support for underlying FS to pass their own buffer during reads (#11324 ) Summary: 1. Public API change: Replace `use_async_io` API in file_system with `SupportedOps` API which is used by underlying FileSystem to indicate to upper layers whether the FileSystem supports different operations introduced in `enum FSSupportedOps `. Right now operations are `async_io` and whether FS will provide its own buffer during reads or not. The api is changed to extend it to various FileSystem operations in one API rather than creating a separate API for each operation. 2. Provide support for underlying FS to pass their own buffer during Reads (async and sync read) instead of using RocksDB provided `scratch` (buffer) in `FSReadRequest`. Currently only MultiRead supports it and later will be extended to other reads as well (point lookup, scan etc). More details in how to enable in file_system.h Pull Request resolved: https://github.com/facebook/rocksdb/pull/11324 Test Plan: Tested locally Reviewed By: anand1976 Differential Revision: D44465322 Pulled By: akankshamahajan15 fbshipit-source-id: 9ec9e08f839b5cc815e75d5dade6cd549998d0ec	2 years ago
Hui Xiao	1da9ac2363	Add UT to test BG read qps behavior during upgrade for pr11406 (#11522 ) Summary: Context/Summary: When db is upgrading to adopt [pr11406](https://github.com/facebook/rocksdb/pull/11406/), it's possible for RocksDB to infer a small tail size to prefetch for pre-upgrade files. Such small tail size would have caused 1 file read per index or filter partition if partitioned index or filer is used. This PR provides a UT to show this would not happen. Misc: refactor the related UTs a bit to make this new UT more readable. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11522 Test Plan: - New UT If logic of upgrade is wrong e.g, ``` --- a/table/block_based/partitioned_index_reader.cc +++ b/table/block_based/partitioned_index_reader.cc @@ -166,7 +166,8 @@ Status PartitionIndexReader::CacheDependencies( uint64_t prefetch_len = last_off - prefetch_off; std::unique_ptr<FilePrefetchBuffer> prefetch_buffer; if (tail_prefetch_buffer == nullptr \|\| !tail_prefetch_buffer->Enabled() \|\| - tail_prefetch_buffer->GetPrefetchOffset() > prefetch_off) { + (false && tail_prefetch_buffer->GetPrefetchOffset() > prefetch_off)) { ``` , then the UT will fail like below ``` [ RUN ] PrefetchTailTest/PrefetchTailTest.UpgradeToTailSizeInManifest/0 file/prefetch_test.cc:461: Failure Expected: (db_open_file_read.count) < (num_index_partition), actual: 38 vs 33 Received signal 11 (Segmentation fault) ``` Reviewed By: pdillinger Differential Revision: D46546707 Pulled By: hx235 fbshipit-source-id: 9897b0a975e9055963edac5451fd1cd9d6c45d0e	2 years ago
Yu Zhang	b421a8c21b	Add a ticker to track number of trash files deleted in background thread (#11540 ) Summary: This ticker combined with `rocksdb.files.marked.trash` can help give a better picture of how DeleteScheduler is keeping up. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11540 Test Plan: ``` ./delete_scheduler_test ``` Reviewed By: ajkr Differential Revision: D46746401 Pulled By: jowlyzhang fbshipit-source-id: f3daa622aa3ddefe7d673e0cc257a47699d506df	2 years ago
Hui Xiao	3093d98c78	Fix higher read qps during db open caused by pr 11406 (#11516 ) Summary: Context: [PR11406](https://github.com/facebook/rocksdb/pull/11406/) caused more frequent read during db open reading files with no `tail_size` in the manifest as part of the upgrade to 11406. This is due to that PR introduced - [smaller](https://github.com/facebook/rocksdb/pull/11406/files#diff-57ed8c49db2bdd4db7618646a177397674bbf25beacacecb104070071d30129fR833) prefetch tail buffer size compared to pre-11406 for small files (< 52 MB) when `tail_prefetch_stats` infers tail size to be 0 (usually happens when the stats does not have much historical data to infer early on) - more read (up to # of partitioned filter/index) when such small prefetch tail buffer does not contain all the partitioned filter/index needed in CacheDependencies() since the [fallback logic](https://github.com/facebook/rocksdb/pull/11406/files#diff-d98f1a83de24412ad7f3527725dae7e28851c7222622c3cdb832d3cdf24bbf9fR165-R179) that prefetches all partitions at once will be [skipped](url) when such a small prefetch tail buffer is passed in Summary: - Revert the fallback prefetch buffer size change to preserve existing behavior fully during upgrading in `BlockBasedTable::PrefetchTail()` - Use passed-in prefetch tail buffer in `CacheDependencies()` only if it has a smaller offset than the the offset of first partition filter/index, that is, at least as good as the existing prefetching behavior Pull Request resolved: https://github.com/facebook/rocksdb/pull/11516 Test Plan: - db bench Create db with small files prior to PR 11406 ``` ./db_bench -db=/tmp/testdb/ --partition_index_and_filters=1 --statistics=1 -benchmarks=fillseq -key_size=3200 -value_size=5 -num=1000000 -write_buffer_size=6550000 -disable_auto_compactions=true -compression_type=zstd` ``` Read db to see if post-pr has lower read qps (i.e, rocksdb.file.read.db.open.micros count) during db open. ``` ./db_bench -use_direct_reads=1 --file_opening_threads=1 --threads=1 --use_existing_db=1 --seed=1682546046158958 --partition_index_and_filters=1 --statistics=1 --db=/tmp/testdb/ --benchmarks=readrandom --key_size=3200 --value_size=5 --num=100 --disable_auto_compactions=true --compression_type=zstd ``` Pre-PR: ``` rocksdb.file.read.db.open.micros P50 : 3.399023 P95 : 5.924468 P99 : 12.408333 P100 : 29.000000 COUNT : 611 SUM : 2539 ``` Post-PR: ``` rocksdb.file.read.db.open.micros P50 : 593.736842 P95 : 861.605263 P99 : 1212.868421 P100 : 2663.000000 COUNT : 585 SUM : 345349 ``` _Note: To control the starting offset of the prefetch tail buffer easier, I manually override the following to eliminate the effect of alignment_ ``` class PosixRandomAccessFile : public FSRandomAccessFile { virtual size_t GetRequiredBufferAlignment() const override { - return logical_sector_size_; + return 1; } ``` - CI Reviewed By: pdillinger Differential Revision: D46472566 Pulled By: hx235 fbshipit-source-id: 2fe14ac8d489d15b0e08e6f8fe4f46d5f110978e	2 years ago
Hui Xiao	50046869a4	Add `rocksdb.file.read.db.open.micros` (#11455 ) Summary: Context/Summary: `rocksdb.file.read.db.open.micros` is left out in https://github.com/facebook/rocksdb/pull/11288 Pull Request resolved: https://github.com/facebook/rocksdb/pull/11455 Test Plan: - db bench Setup: `./db_bench -db=/dev/shm/testdb/ -statistics=true -benchmarks="fillseq" -key_size=32 -value_size=512 -num=5000 -write_buffer_size=655 -target_file_size_base=655 -disable_auto_compactions=false -compression_type=none -bloom_bits=3` Run: `./db_bench --bloom_bits=3 --use_existing_db=1 --seed=1682546046158958 --partition_index_and_filters=1 --statistics=1 -db=/dev/shm/testdb/ -benchmarks=readrandom -key_size=3200 -value_size=512 -num=0 -write_buffer_size=6550000 -disable_auto_compactions=false -target_file_size_base=6550000 -compression_type=none -file_checksum=1 -cache_size=1` ``` rocksdb.sst.read.micros P50 : 3.979798 P95 : 9.738420 P99 : 19.566667 P100 : 39.000000 COUNT : 2360 SUM : 12148 rocksdb.file.read.flush.micros P50 : 0.000000 P95 : 0.000000 P99 : 0.000000 P100 : 0.000000 COUNT : 0 SUM : 0 rocksdb.file.read.compaction.micros P50 : 0.000000 P95 : 0.000000 P99 : 0.000000 P100 : 0.000000 COUNT : 0 SUM : 0 rocksdb.file.read.db.open.micros P50 : 3.979798 P95 : 9.738420 P99 : 19.566667 P100 : 39.000000 COUNT : 2360 SUM : 12148 ``` Reviewed By: ajkr Differential Revision: D45951934 Pulled By: hx235 fbshipit-source-id: 6c88639dc1b10d98ecccc963ce32a8800495f55b	2 years ago
Peter Dillinger	206fdea3d9	Change internal headers with duplicate names (#11408 ) Summary: In IDE navigation I find it annoying that there are two statistics.h files (etc.) and often land on the wrong one. Here I migrate several headers to use the blah.h <- blah_impl.h <- blah.cc idiom. Although clang-format wants "blah.h" to be the top include for "blah.cc", I think overall this is an improvement. No public API changes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11408 Test Plan: existing tests Reviewed By: ltamasi Differential Revision: D45456696 Pulled By: pdillinger fbshipit-source-id: 809d931253f3272c908cf5facf7e1d32fc507373	2 years ago
Hui Xiao	8f763bdeab	Record and use the tail size to prefetch table tail (#11406 ) Summary: Context: We prefetch the tail part of a SST file (i.e, the blocks after data blocks till the end of the file) during each SST file open in hope to prefetch all the stuff at once ahead of time for later read e.g, footer, meta index, filter/index etc. The existing approach to estimate the tail size to prefetch is through `TailPrefetchStats` heuristics introduced in https://github.com/facebook/rocksdb/pull/4156, which has caused small reads in unlucky case (e.g, small read into the tail buffer during table open in thread 1 under the same BlockBasedTableFactory object can make thread 2's tail prefetching use a small size that it shouldn't) and is hard to debug. Therefore we decide to record the exact tail size and use it directly to prefetch tail of the SST instead of relying heuristics. Summary: - Obtain and record in manifest the tail size in `BlockBasedTableBuilder::Finish()` - For backward compatibility, we fall back to TailPrefetchStats and last to simple heuristics that the tail size is a linear portion of the file size - see PR conversation for more. - Make`tail_start_offset` part of the table properties and deduct tail size to record in manifest for external files (e.g, file ingestion, import CF) and db repair (with no access to manifest). Pull Request resolved: https://github.com/facebook/rocksdb/pull/11406 Test Plan: 1. New UT 2. db bench Note: db bench on /tmp/ where direct read is supported is too slow to finish and the default pinning setting in db bench is not helpful to profile # sst read of Get. Therefore I hacked the following to obtain the following comparison. ``` diff --git a/table/block_based/block_based_table_reader.cc b/table/block_based/block_based_table_reader.cc index bd5669f0f..791484c1f 100644 --- a/table/block_based/block_based_table_reader.cc +++ b/table/block_based/block_based_table_reader.cc @@ -838,7 +838,7 @@ Status BlockBasedTable::PrefetchTail( &tail_prefetch_size); // Try file system prefetch - if (!file->use_direct_io() && !force_direct_prefetch) { + if (false && !file->use_direct_io() && !force_direct_prefetch) { if (!file->Prefetch(prefetch_off, prefetch_len, ro.rate_limiter_priority) .IsNotSupported()) { prefetch_buffer->reset(new FilePrefetchBuffer( diff --git a/tools/db_bench_tool.cc b/tools/db_bench_tool.cc index ea40f5fa0..39a0ac385 100644 --- a/tools/db_bench_tool.cc +++ b/tools/db_bench_tool.cc @@ -4191,6 +4191,8 @@ class Benchmark { std::shared_ptr<TableFactory>(NewCuckooTableFactory(table_options)); } else { BlockBasedTableOptions block_based_options; + block_based_options.metadata_cache_options.partition_pinning = + PinningTier::kAll; block_based_options.checksum = static_cast<ChecksumType>(FLAGS_checksum_type); if (FLAGS_use_hash_search) { ``` Create DB ``` ./db_bench --bloom_bits=3 --use_existing_db=1 --seed=1682546046158958 --partition_index_and_filters=1 --statistics=1 -db=/dev/shm/testdb/ -benchmarks=readrandom -key_size=3200 -value_size=512 -num=1000000 -write_buffer_size=6550000 -disable_auto_compactions=false -target_file_size_base=6550000 -compression_type=none ``` ReadRandom ``` ./db_bench --bloom_bits=3 --use_existing_db=1 --seed=1682546046158958 --partition_index_and_filters=1 --statistics=1 -db=/dev/shm/testdb/ -benchmarks=readrandom -key_size=3200 -value_size=512 -num=1000000 -write_buffer_size=6550000 -disable_auto_compactions=false -target_file_size_base=6550000 -compression_type=none ``` (a) Existing (Use TailPrefetchStats for tail size + use seperate prefetch buffer in PartitionedFilter/IndexReader::CacheDependencies()) ``` rocksdb.table.open.prefetch.tail.hit COUNT : 3395 rocksdb.sst.read.micros P50 : 5.655570 P95 : 9.931396 P99 : 14.845454 P100 : 585.000000 COUNT : 999905 SUM : 6590614 ``` (b) This PR (Record tail size + use the same tail buffer in PartitionedFilter/IndexReader::CacheDependencies()) ``` rocksdb.table.open.prefetch.tail.hit COUNT : 14257 rocksdb.sst.read.micros P50 : 5.173347 P95 : 9.015017 P99 : 12.912610 P100 : 228.000000 COUNT : 998547 SUM : 5976540 ``` As we can see, we increase the prefetch tail hit count and decrease SST read count with this PR 3. Test backward compatibility by stepping through reading with post-PR code on a db generated pre-PR. Reviewed By: pdillinger Differential Revision: D45413346 Pulled By: hx235 fbshipit-source-id: 7d5e36a60a72477218f79905168d688452a4c064	2 years ago
clundro	50b33ebb1b	remove redundant move (#11418 ) Summary: when I use g++-13 to exec the `make all` command, the output throws the warnings. ``` db/compaction/compaction_job_test.cc: In member function ‘void rocksdb::CompactionJobTestBase::AddMockFile(const rocksdb::mock::KVVector&, int)’: db/compaction/compaction_job_test.cc:376:57: error: redundant move in initialization [-Werror=redundant-move] 376 \| env_, GenerateFileName(file_number), std::move(contents))); \| ~~~~~~~~~^~~~~~~~~~ db/compaction/compaction_job_test.cc:375:7: note: in expansion of macro ‘EXPECT_OK’ 375 \| EXPECT_OK(mock_table_factory_->CreateMockTable( \| ^~~~~~~~~ db/compaction/compaction_job_test.cc:376:57: note: remove ‘std::move’ call 376 \| env_, GenerateFileName(file_number), std::move(contents))); \| ~~~~~~~~~^~~~~~~~~~ db/compaction/compaction_job_test.cc:375:7: note: in expansion of macro ‘EXPECT_OK’ 375 \| EXPECT_OK(mock_table_factory_->CreateMockTable( \| ^~~~~~~~~ cc1plus: all warnings being treated as errors make: *** [Makefile:2507: db/compaction/compaction_job_test.o] Error 1 ``` and I also add some `(void)unused_variable` statements because of the cmake argument `-Wunused-but-set-variable -Wunused-but-set-variable` Pull Request resolved: https://github.com/facebook/rocksdb/pull/11418 Reviewed By: akankshamahajan15 Differential Revision: D45528223 Pulled By: ajkr fbshipit-source-id: fee1a77c30039a56b481de953f0a834cc788abbc	2 years ago
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/Flushrun 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
anand76	0623c5b903	Ensure VerifyFileChecksums reads don't exceed readahead_size (#11328 ) Summary: VerifyFileChecksums currently interprets the readahead_size as a payload of readahead_size for calculating the checksum, plus a prefetch of an additional readahead_size. Hence each read is readahead_size * 2. This change treats it as chunks of readahead_size for checksum calculation. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11328 Test Plan: Add a unit test Reviewed By: pdillinger Differential Revision: D44718781 Pulled By: anand1976 fbshipit-source-id: 79bae1ebaa27de2a13bc86f5910bf09356936e63	2 years ago
anand76	eac6b6d0cd	Ignore async_io ReadOption if FileSystem doesn't support it (#11296 ) Summary: In PosixFileSystem, IO uring support is opt-in. If the support is not enabled by the user, then ignore the async_io ReadOption in MultiGet and iteration at the top, rather than follow the async_io codepath and transparently switch to sync IO at the FileSystem layer. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11296 Test Plan: Add new unit tests Reviewed By: akankshamahajan15 Differential Revision: D44045776 Pulled By: anand1976 fbshipit-source-id: a0881bf763ca2fde50b84063d0068bb521edd8b9	2 years ago
Hui Xiao	bab5f9a6f2	Add new stat rocksdb.table.open.prefetch.tail.read.bytes, rocksdb.table.open.prefetch.tail.{miss\|hit} (#11265 ) Summary: Context/Summary: We are adding new stats to measure behavior of prefetched tail size and look up into this buffer The stat collection is done in FilePrefetchBuffer but only for prefetched tail buffer during table open for now using FilePrefetchBuffer enum. It's cleaner than the alternative of implementing in upper-level call places of FilePrefetchBuffer for table open. It also has the benefit of extensible to other types of FilePrefetchBuffer if needed. See db bench for perf regression concern. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11265 Test Plan: - Piggyback on existing test - rocksdb.table.open.prefetch.tail.miss is harder to UT so I manually set prefetch tail read bytes to be small and run db bench. ``` ./db_bench -db=/tmp/testdb -statistics=true -benchmarks="fillseq" -key_size=32 -value_size=512 -num=5000 -write_buffer_size=655 -target_file_size_base=655 -disable_auto_compactions=false -compression_type=none -bloom_bits=3 -use_direct_reads=true ``` ``` rocksdb.table.open.prefetch.tail.read.bytes P50 : 4096.000000 P95 : 4096.000000 P99 : 4096.000000 P100 : 4096.000000 COUNT : 225 SUM : 921600 rocksdb.table.open.prefetch.tail.miss COUNT : 91 rocksdb.table.open.prefetch.tail.hit COUNT : 1034 ``` - No perf regression observed in db_bench SETUP command: create same db with ~900 files for pre-change/post-change. ``` ./db_bench -db=/tmp/testdb -benchmarks="fillseq" -key_size=32 -value_size=512 -num=500000 -write_buffer_size=655360 -disable_auto_compactions=true -target_file_size_base=16777216 -compression_type=none ``` TEST command 60 runs or til convergence: as suggested by anand1976 and akankshamahajan15, vary `seek_nexts` and `async_io` in testing. ``` ./db_bench -use_existing_db=true -db=/tmp/testdb -statistics=false -cache_size=0 -cache_index_and_filter_blocks=false -benchmarks=seekrandom[-X60] -num=50000 -seek_nexts={10, 500, 1000} -async_io={0\|1} -use_direct_reads=true ``` async io = 0, direct io read = true \| seek_nexts = 10, 30 runs \| seek_nexts = 500, 12 runs \| seek_nexts = 1000, 6 runs -- \| -- \| -- \| -- pre-post change \| 4776 (± 28) ops/sec; 24.8 (± 0.1) MB/sec \| 288 (± 1) ops/sec; 74.8 (± 0.4) MB/sec \| 145 (± 4) ops/sec; 75.6 (± 2.2) MB/sec post-change \| 4790 (± 32) ops/sec; 24.9 (± 0.2) MB/sec \| 288 (± 3) ops/sec; 74.7 (± 0.8) MB/sec \| 143 (± 3) ops/sec; 74.5 (± 1.6) MB/sec async io = 1, direct io read = true \| seek_nexts = 10, 54 runs \| seek_nexts = 500, 6 runs \| seek_nexts = 1000, 4 runs -- \| -- \| -- \| -- pre-post change \| 3350 (± 36) ops/sec; 17.4 (± 0.2) MB/sec \| 264 (± 0) ops/sec; 68.7 (± 0.2) MB/sec \| 138 (± 1) ops/sec; 71.8 (± 1.0) MB/sec post-change \| 3358 (± 27) ops/sec; 17.4 (± 0.1) MB/sec \| 263 (± 2) ops/sec; 68.3 (± 0.8) MB/sec \| 139 (± 1) ops/sec; 72.6 (± 0.6) MB/sec Reviewed By: ajkr Differential Revision: D43781467 Pulled By: hx235 fbshipit-source-id: a706a18472a8edb2b952bac3af40eec803537f2a	2 years ago
akankshamahajan	68e4581c67	Return NotSupported in scan if IOUring not supported and enable IOUring in db_stress for async_io testing (#11197 ) Summary: - Return NotSupported in scan if IOUring not supported if async_io is enabled - Enable IOUring in db_stress for async_io testing - Disable async_io in circleci crash testing as circleci doesn't support IOUring Pull Request resolved: https://github.com/facebook/rocksdb/pull/11197 Test Plan: CircleCI jobs Reviewed By: anand1976 Differential Revision: D43096313 Pulled By: akankshamahajan15 fbshipit-source-id: c2c53a87636950c0243038b9f5bd0d91608e4fda	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
akankshamahajan	bde65052c4	Enhance async scan prefetch unit tests (#11087 ) Summary: Add more coverage in unit tests for async scan. The added unit test fails without PR https://github.com/facebook/rocksdb/pull/10939. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11087 Test Plan: CircleCI jobs status for new unit tests. Reviewed By: anand1976 Differential Revision: D42487931 Pulled By: akankshamahajan15 fbshipit-source-id: d59ed7666599bd0d2733ac5d76bd70984b54c5a9	2 years ago
anand76	a510880346	Add a unit test for async prefetch fix in #11049 (#11084 ) Summary: Add a unit test in prefetch_test for https://github.com/facebook/rocksdb/issues/11049 Pull Request resolved: https://github.com/facebook/rocksdb/pull/11084 Test Plan: Verify the test fails without https://github.com/facebook/rocksdb/issues/11049 and passes with it Reviewed By: akankshamahajan15 Differential Revision: D42485828 Pulled By: anand1976 fbshipit-source-id: ae512f2d121745a1f5212645a9b58868976c1f83	2 years ago
anand76	dbf37c290a	Fix async prefetch heap use after free (#11049 ) Summary: This PR fixes a heap use after free bug in the async prefetch code that happens in the following scenario - 1. Scan thread starts 2 async reads for Seek, one for the seek block and one for prefetching 2. Before the first read in https://github.com/facebook/rocksdb/issues/1 completes, another thread reads and loads the block in cache 3. The first scan thread finds the block in cache, continues and the next block cache miss is for a block that spans the boundary of the 2 prefetch buffers, and the 1st read is complete but the 2nd one is not complete yet 4. The scan thread will reallocate (i.e free the old buffer and allocate a new one) the 2nd prefetch buffer, and the in-progress prefetch is orphaned 5. The orphaned prefetch finally completes, resulting in a use after free Also add a few asserts to surface bugs earlier in the crash tests. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11049 Test Plan: Repro with db_stress and verify the fix Reviewed By: akankshamahajan15 Differential Revision: D42181118 Pulled By: anand1976 fbshipit-source-id: 1ac55d2f64a89ce128c1c574262b8aa7d82eb8cc	2 years ago
Akanksha Mahajan	1562524e63	Fix db_stress failure in async_io in FilePrefetchBuffer (#10949 ) Summary: Fix db_stress failure in async_io in FilePrefetchBuffer. From the logs, assertion was caused when - prev_offset_ = offset but somehow prev_len != 0 and explicit_prefetch_submitted_ = true. That scenario is when we send async request to prefetch buffer during seek but in second seek that data is found in cache. prev_offset_ and prev_len_ get updated but we were not setting explicit_prefetch_submitted_ = false because of which buffers were getting out of sync. It's possible a read by another thread might have loaded the block into the cache in the meantime. Particular assertion example: ``` prev_offset: 0, prev_len_: 8097 , offset: 0, length: 8097, actual_length: 8097 , actual_offset: 0 , curr_: 0, bufs_[curr_].offset_: 4096 ,bufs_[curr_].CurrentSize(): 48541 , async_len_to_read: 278528, bufs_[curr_].async_in_progress_: false second: 1, bufs_[second].offset_: 282624 ,bufs_[second].CurrentSize(): 0, async_len_to_read: 262144 ,bufs_[second].async_in_progress_: true , explicit_prefetch_submitted_: true , copy_to_third_buffer: false ``` As we can see curr_ was expected to read 278528 but it read 48541. Also buffers are out of sync. Also `explicit_prefetch_submitted_` is set true but prev_len not 0. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10949 Test Plan: - Ran db_bench for regression to make sure there is no regression; - Ran db_stress failing without this fix, - Ran build-linux-mini-crashtest 7- 8 times locally + CircleCI Reviewed By: anand1976 Differential Revision: D41257786 Pulled By: akankshamahajan15 fbshipit-source-id: 1d100f94f8c06bbbe4cc76ca27f1bbc820c2494f	2 years ago
akankshamahajan	8515437594	Update unit test to avoid timeout (#10950 ) Summary: Update unit test to avoid timeout Pull Request resolved: https://github.com/facebook/rocksdb/pull/10950 Reviewed By: hx235 Differential Revision: D41258892 Pulled By: akankshamahajan15 fbshipit-source-id: cbfe94da63e9e54544a307845deb79ba42458301	2 years ago
anand76	ecba6a320e	Add some async read stats (#10947 ) Summary: Add stats for time spent in the ReadAsync call, and async read errors. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10947 Test Plan: Run db_bench and look at stats Reviewed By: akankshamahajan15 Differential Revision: D41236637 Pulled By: anand1976 fbshipit-source-id: 70539b69a28491d57acead449436a761f7108acf	2 years ago
akankshamahajan	d1aca4a5ae	Fix async_io regression in scans (#10939 ) Summary: Fix async_io regression in scans due to incorrect check which was causing the valid data in buffer to be cleared during seek. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10939 Test Plan: - stress tests export CRASH_TEST_EXT_ARGS="--async_io=1" make crash_test -j32 - Ran db_bench command which was caught the regression: ./db_bench --db=/rocksdb_async_io_testing/prefix_scan --disable_wal=1 --use_existing_db=true --benchmarks="seekrandom" -key_size=32 -value_size=512 -num=50000000 -use_direct_reads=false -seek_nexts=963 -duration=30 -ops_between_duration_checks=1 --async_io=true --compaction_readahead_size=4194304 --log_readahead_size=0 --blob_compaction_readahead_size=0 --initial_auto_readahead_size=65536 --num_file_reads_for_auto_readahead=0 --max_auto_readahead_size=524288 seekrandom : 3777.415 micros/op 264 ops/sec 30.000 seconds 7942 operations; 132.3 MB/s (7942 of 7942 found) Reviewed By: anand1976 Differential Revision: D41173899 Pulled By: akankshamahajan15 fbshipit-source-id: 2d75b06457d65b1851c92382565d9c3fac329dfe	2 years ago
akankshamahajan	ff9ad2c39b	Fix async_io failures in case there is error in reading data (#10890 ) Summary: Fix memory corruption error in scans if async_io is enabled. Memory corruption happened if data is overlapping between two buffers. If there is IOError while reading the data, it leads to empty buffer and other buffer already in progress of async read goes again for reading causing the error. Fix: Added check to abort IO in second buffer if curr_ got empty. This PR also fixes db_stress failures which happened when buffers are not aligned. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10890 Test Plan: - Ran make crash_test -j32 with async_io enabled. - Ran benchmarks to make sure there is no regression. Reviewed By: anand1976 Differential Revision: D40881731 Pulled By: akankshamahajan15 fbshipit-source-id: 39fcf2134c7b1bbb08415ede3e1ef261ac2dbc58	2 years ago
akankshamahajan	671753c43d	Run Clang format on file folder (#10860 ) Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/10860 Test Plan: CircleCI jobs Reviewed By: anand1976 Differential Revision: D40656236 Pulled By: akankshamahajan15 fbshipit-source-id: 557600db5c2e0ab9b400655336c467307f7136de	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
akankshamahajan	ae0f9c3339	Add new property in IOOptions to skip recursing through directories and list only files during GetChildren. (#10668 ) Summary: Add new property "do_not_recurse" in IOOptions for underlying file system to skip iteration of directories during DB::Open if there are no sub directories and list only files. By default this property is set to false. This property is set true currently in the code where RocksDB is sure only files are needed during DB::Open. Provided support in PosixFileSystem to use "do_not_recurse". TestPlan: - Existing tests Pull Request resolved: https://github.com/facebook/rocksdb/pull/10668 Reviewed By: anand1976 Differential Revision: D39471683 Pulled By: akankshamahajan15 fbshipit-source-id: 90e32f0b86d5346d53bc2714d3a0e7002590527f	2 years ago
Hui Xiao	3b8164912e	Add manual_wal_flush, FlushWAL() to stress/crash test (#10698 ) Summary: Context/Summary: Introduce `manual_wal_flush_one_in` as titled. - When `manual_wal_flush_one_in > 0`, we also need tracing to correctly verify recovery because WAL data can be lost in this case when `FlushWAL()` is not explicitly called by users of RocksDB (in our case, db stress) and the recovery from such potential WAL data loss is a prefix recovery that requires tracing to verify. As another consequence, we need to disable features can't run under unsync data loss with `manual_wal_flush_one_in` Incompatibilities fixed along the way: ``` db_stress: db/db_impl/db_impl_open.cc:2063: static rocksdb::Status rocksdb::DBImpl::Open(const rocksdb::DBOptions&, const string&, const std::vector<rocksdb::ColumnFamilyDescriptor>&, std::vector<rocksdb::ColumnFamilyHandle>, rocksdb::DB**, bool, bool): Assertion `impl->TEST_WALBufferIsEmpty()' failed. ``` - It turns out that `Writer::AddCompressionTypeRecord` before this assertion `EmitPhysicalRecord(kSetCompressionType, encode.data(), encode.size());` but do not trigger flush if `manual_wal_flush` is set . This leads to `impl->TEST_WALBufferIsEmpty()' is false. - As suggested, assertion is removed and violation case is handled by `FlushWAL(sync=true)` along with refactoring `TEST_WALBufferIsEmpty()` to be `WALBufferIsEmpty()` since it is used in prod code now. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10698 Test Plan: - Locally running `python3 tools/db_crashtest.py blackbox --manual_wal_flush_one_in=1 --manual_wal_flush=1 --sync_wal_one_in=100 --atomic_flush=1 --flush_one_in=100 --column_families=3` - Joined https://github.com/facebook/rocksdb/pull/10624 in auto CI testings with all RocksDB stress/crash test jobs Reviewed By: ajkr Differential Revision: D39593752 Pulled By: ajkr fbshipit-source-id: 3a2135bb792c52d2ffa60257d4fbc557fb04d2ce	2 years ago
Akanksha Mahajan	03fc43976d	Async optimization in scan path (#10602 ) Summary: Optimizations 1. In FilePrefetchBuffer, when data is overlapping between two buffers, it copies the data from first to third buffer, then from second to third buffer to return continuous buffer. This optimization will call ReadAsync on first buffer as soon as buffer is empty instead of getting blocked by second buffer to copy the data. 2. For fixed size readahead_size, FilePrefetchBuffer will issues two async read calls. One with length + readahead_size_/2 on first buffer(if buffer is empty) and readahead_size_/2 on second buffer during seek. - Add readahead_size to db_stress for stress testing these changes in https://github.com/facebook/rocksdb/pull/10632 Pull Request resolved: https://github.com/facebook/rocksdb/pull/10602 Test Plan: - CircleCI tests - stress_test completed successfully export CRASH_TEST_EXT_ARGS="--async_io=1" make crash_test -j32 - db_bench showed no regression With this PR: ``` ./db_bench -use_existing_db=true -db=/tmp/prefix_scan_prefetch_main1 -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=50000000 -use_direct_reads=false -seek_nexts=327680 -duration=30 -ops_between_duration_checks=1 -async_io=1 Set seed to 1661876074584472 because --seed was 0 Initializing RocksDB Options from the specified file Initializing RocksDB Options from command-line flags Integrated BlobDB: blob cache disabled RocksDB: version 7.7.0 Date: Tue Aug 30 09:14:34 2022 CPU: 32 * Intel Xeon Processor (Skylake) CPUCache: 16384 KB Keys: 32 bytes each (+ 0 bytes user-defined timestamp) Values: 512 bytes each (256 bytes after compression) Entries: 50000000 Prefix: 0 bytes Keys per prefix: 0 RawSize: 25939.9 MB (estimated) FileSize: 13732.9 MB (estimated) Write rate: 0 bytes/second Read rate: 0 ops/second Compression: Snappy Compression sampling rate: 0 Memtablerep: SkipListFactory Perf Level: 1 ------------------------------------------------ DB path: [/tmp/prefix_scan_prefetch_main1] seekrandom : 270878.018 micros/op 3 ops/sec 30.068 seconds 111 operations; 618.7 MB/s (111 of 111 found) ./db_bench -use_existing_db=true -db=/tmp/prefix_scan_prefetch_main1 -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=50000000 -use_direct_reads=true -seek_nexts=327680 -duration=30 -ops_between_duration_checks=1 -async_io=1 Set seed to 1661875332862922 because --seed was 0 Initializing RocksDB Options from the specified file Initializing RocksDB Options from command-line flags Integrated BlobDB: blob cache disabled RocksDB: version 7.7.0 Date: Tue Aug 30 09:02:12 2022 CPU: 32 * Intel Xeon Processor (Skylake) CPUCache: 16384 KB Keys: 32 bytes each (+ 0 bytes user-defined timestamp) Values: 512 bytes each (256 bytes after compression) Entries: 50000000 Prefix: 0 bytes Keys per prefix: 0 RawSize: 25939.9 MB (estimated) FileSize: 13732.9 MB (estimated) Write rate: 0 bytes/second Read rate: 0 ops/second Compression: Snappy Compression sampling rate: 0 Memtablerep: SkipListFactory Perf Level: 1 WARNING: Assertions are enabled; benchmarks unnecessarily slow ------------------------------------------------ DB path: [/tmp/prefix_scan_prefetch_main1] seekrandom : 358352.488 micros/op 2 ops/sec 30.102 seconds 84 operations; 474.4 MB/s (84 of 84 found) ``` Without PR in main: ``` ./db_bench -use_existing_db=true -db=/tmp/prefix_scan_prefetch_main1 -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=50000000 -use_direct_reads=false -seek_nexts=327680 -duration=30 -ops_between_duration_checks=1 -async_io=1 Set seed to 1661876425983045 because --seed was 0 Initializing RocksDB Options from the specified file Initializing RocksDB Options from command-line flags Integrated BlobDB: blob cache disabled RocksDB: version 7.7.0 Date: Tue Aug 30 09:20:26 2022 CPU: 32 * Intel Xeon Processor (Skylake) CPUCache: 16384 KB Keys: 32 bytes each (+ 0 bytes user-defined timestamp) Values: 512 bytes each (256 bytes after compression) Entries: 50000000 Prefix: 0 bytes Keys per prefix: 0 RawSize: 25939.9 MB (estimated) FileSize: 13732.9 MB (estimated) Write rate: 0 bytes/second Read rate: 0 ops/second Compression: Snappy Compression sampling rate: 0 Memtablerep: SkipListFactory Perf Level: 1 ------------------------------------------------ DB path: [/tmp/prefix_scan_prefetch_main1] seekrandom : 280881.953 micros/op 3 ops/sec 30.054 seconds 107 operations; 605.2 MB/s (107 of 107 found) ./db_bench -use_existing_db=true -db=/tmp/prefix_scan_prefetch_main1 -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=50000000 -use_direct_reads=false -seek_nexts=327680 -duration=30 -ops_between_duration_checks=1 -async_io=0 Set seed to 1661876475267771 because --seed was 0 Initializing RocksDB Options from the specified file Initializing RocksDB Options from command-line flags Integrated BlobDB: blob cache disabled RocksDB: version 7.7.0 Date: Tue Aug 30 09:21:15 2022 CPU: 32 * Intel Xeon Processor (Skylake) CPUCache: 16384 KB Keys: 32 bytes each (+ 0 bytes user-defined timestamp) Values: 512 bytes each (256 bytes after compression) Entries: 50000000 Prefix: 0 bytes Keys per prefix: 0 RawSize: 25939.9 MB (estimated) FileSize: 13732.9 MB (estimated) Write rate: 0 bytes/second Read rate: 0 ops/second Compression: Snappy Compression sampling rate: 0 Memtablerep: SkipListFactory Perf Level: 1 ------------------------------------------------ DB path: [/tmp/prefix_scan_prefetch_main1] seekrandom : 363155.084 micros/op 2 ops/sec 30.142 seconds 83 operations; 468.1 MB/s (83 of 83 found) ``` Reviewed By: anand1976 Differential Revision: D39141328 Pulled By: akankshamahajan15 fbshipit-source-id: 560655922c1a437a8569c228abb31b8c0b413120	2 years ago
Akanksha Mahajan	4cd16d65ae	Add new option num_file_reads_for_auto_readahead in BlockBasedTableOptions (#10556 ) Summary: RocksDB does auto-readahead for iterators on noticing more than two reads for a table file if user doesn't provide readahead_size and reads are sequential. A new option num_file_reads_for_auto_readahead is added which can be configured and indicates after how many sequential reads prefetching should be start. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10556 Test Plan: Existing and new unit test Reviewed By: anand1976 Differential Revision: D38947147 Pulled By: akankshamahajan15 fbshipit-source-id: c9eeab495f84a8df7f701c42f04894e46440ad97	2 years ago
anand76	5fbcc8c54d	Update MULTIGET_IO_BATCH_SIZE for non-async MultiGet (#10622 ) Summary: This stat was only getting updated in the async (coroutine) version of MultiGet. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10622 Reviewed By: akankshamahajan15 Differential Revision: D39188790 Pulled By: anand1976 fbshipit-source-id: 7e231507f65fc94c8a006c38f79dfba182a2c24a	2 years ago
Hui Xiao	e484b81eee	Sync dir containing CURRENT after RenameFile on CURRENT as much as possible (#10573 ) Summary: Context: Below crash test revealed a bug that directory containing CURRENT file (short for `dir_contains_current_file` below) was not always get synced after a new CURRENT is created and being called with `RenameFile` as part of the creation. This bug exposes a risk that such un-synced directory containing the updated CURRENT can’t survive a host crash (e.g, power loss) hence get corrupted. This then will be followed by a recovery from a corrupted CURRENT that we don't want. The root-cause is that a nullptr `FSDirectory* dir_contains_current_file` sometimes gets passed-down to `SetCurrentFile()` hence in those case `dir_contains_current_file->FSDirectory::FsyncWithDirOptions()` will be skipped (which otherwise will internally call`Env/FS::SyncDic()` ) ``` ./db_stress --acquire_snapshot_one_in=10000 --adaptive_readahead=1 --allow_data_in_errors=True --avoid_unnecessary_blocking_io=0 --backup_max_size=104857600 --backup_one_in=100000 --batch_protection_bytes_per_key=8 --block_size=16384 --bloom_bits=134.8015470676662 --bottommost_compression_type=disable --cache_size=8388608 --checkpoint_one_in=1000000 --checksum_type=kCRC32c --clear_column_family_one_in=0 --compact_files_one_in=1000000 --compact_range_one_in=1000000 --compaction_pri=2 --compaction_ttl=100 --compression_max_dict_buffer_bytes=511 --compression_max_dict_bytes=16384 --compression_type=zstd --compression_use_zstd_dict_trainer=1 --compression_zstd_max_train_bytes=65536 --continuous_verification_interval=0 --data_block_index_type=0 --db=$db --db_write_buffer_size=1048576 --delpercent=5 --delrangepercent=0 --destroy_db_initially=0 --disable_wal=0 --enable_compaction_filter=0 --enable_pipelined_write=1 --expected_values_dir=$exp --fail_if_options_file_error=1 --file_checksum_impl=none --flush_one_in=1000000 --get_current_wal_file_one_in=0 --get_live_files_one_in=1000000 --get_property_one_in=1000000 --get_sorted_wal_files_one_in=0 --index_block_restart_interval=4 --ingest_external_file_one_in=0 --iterpercent=10 --key_len_percent_dist=1,30,69 --level_compaction_dynamic_level_bytes=True --mark_for_compaction_one_file_in=10 --max_background_compactions=20 --max_bytes_for_level_base=10485760 --max_key=10000 --max_key_len=3 --max_manifest_file_size=16384 --max_write_batch_group_size_bytes=64 --max_write_buffer_number=3 --max_write_buffer_size_to_maintain=0 --memtable_prefix_bloom_size_ratio=0.001 --memtable_protection_bytes_per_key=1 --memtable_whole_key_filtering=1 --mmap_read=1 --nooverwritepercent=1 --open_metadata_write_fault_one_in=0 --open_read_fault_one_in=0 --open_write_fault_one_in=0 --ops_per_thread=100000000 --optimize_filters_for_memory=1 --paranoid_file_checks=1 --partition_pinning=2 --pause_background_one_in=1000000 --periodic_compaction_seconds=0 --prefix_size=5 --prefixpercent=5 --prepopulate_block_cache=1 --progress_reports=0 --read_fault_one_in=1000 --readpercent=45 --recycle_log_file_num=0 --reopen=0 --ribbon_starting_level=999 --secondary_cache_fault_one_in=32 --secondary_cache_uri=compressed_secondary_cache://capacity=8388608 --set_options_one_in=10000 --snapshot_hold_ops=100000 --sst_file_manager_bytes_per_sec=0 --sst_file_manager_bytes_per_truncate=0 --subcompactions=3 --sync_fault_injection=1 --target_file_size_base=2097 --target_file_size_multiplier=2 --test_batches_snapshots=1 --top_level_index_pinning=1 --use_full_merge_v1=1 --use_merge=1 --value_size_mult=32 --verify_checksum=1 --verify_checksum_one_in=1000000 --verify_db_one_in=100000 --verify_sst_unique_id_in_manifest=1 --wal_bytes_per_sync=524288 --write_buffer_size=4194 --writepercent=35 ``` ``` stderr: WARNING: prefix_size is non-zero but memtablerep != prefix_hash db_stress: utilities/fault_injection_fs.cc:748: virtual rocksdb::IOStatus rocksdb::FaultInjectionTestFS::RenameFile(const std::string &, const std::string &, const rocksdb::IOOptions &, rocksdb::IODebugContext ): Assertion `tlist.find(tdn.second) == tlist.end()' failed.` ``` Summary:* The PR ensured the non-test path pass down a non-null dir containing CURRENT (which is by current RocksDB assumption just db_dir) by doing the following: - Renamed `directory_to_fsync` as `dir_contains_current_file` in `SetCurrentFile()` to tighten the association between this directory and CURRENT file - Changed `SetCurrentFile()` API to require `dir_contains_current_file` being passed-in, instead of making it by default nullptr. - Because `SetCurrentFile()`'s `dir_contains_current_file` is passed down from `VersionSet::LogAndApply()` then `VersionSet::ProcessManifestWrites()` (i.e, think about this as a chain of 3 functions related to MANIFEST update), these 2 functions also got refactored to require `dir_contains_current_file` - Updated the non-test-path callers of these 3 functions to obtain and pass in non-nullptr `dir_contains_current_file`, which by current assumption of RocksDB, is the `FSDirectory* db_dir`. - `db_impl` path will obtain `DBImpl::directories_.getDbDir()` while others with no access to such `directories_` are obtained on the fly by creating such object `FileSystem::NewDirectory(..)` and manage it by unique pointers to ensure short life time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10573 Test Plan: - `make check` - Passed the repro db_stress command - For future improvement, since we currently don't assert dir containing CURRENT to be non-nullptr due to https://github.com/facebook/rocksdb/pull/10573#pullrequestreview-1087698899, there is still chances that future developers mistakenly pass down nullptr dir containing CURRENT thus resulting skipped sync dir and cause the bug again. Therefore a smarter test (e.g, such as quoted from ajkr "(make) unsynced data loss to be dropping files corresponding to unsynced directory entries") is still needed. Reviewed By: ajkr Differential Revision: D39005886 Pulled By: hx235 fbshipit-source-id: 336fb9090d0cfa6ca3dd580db86268007dde7f5a	2 years ago
anand76	72a3fb3424	Update statistics for async scan readaheads (#10585 ) Summary: Imported a fix to "rocksdb.prefetched.bytes.discarded" stat from https://github.com/facebook/rocksdb/issues/10561, and added a new stat "rocksdb.async.prefetch.abort.micros" to measure time spent waiting for async reads to abort. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10585 Reviewed By: akankshamahajan15 Differential Revision: D39067000 Pulled By: anand1976 fbshipit-source-id: d7cda71abb48017239bd5fd832345a16c7024faf	2 years ago
sdong	4915f89513	WritableFileWriter to allow operation after failure when SyncWithoutFlush() is involved (#10555 ) Summary: https://github.com/facebook/rocksdb/pull/10489 adds an assertion in most functions in WritableFileWriter to check no previous error. However, it only works without calling SyncWithoutFlush(). The nature of SyncWithoutFlush() makes two concurrent call fails to check status code of each other and causing assertion failure. Fix the problem by skipping the check after SyncWithoutFlush() is called and not check status code in SyncWithoutFlush(). Since the original change was not officially released yet, the fix isn't added to HISTORY.md. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10555 Test Plan: Make sure existing tests still pass Reviewed By: anand1976 Differential Revision: D38946208 fbshipit-source-id: 63566732d3f25c8a8342840499cf7b7d745f27c2	2 years ago
sdong	911c0208b9	WritableFileWriter tries to skip operations after failure (#10489 ) Summary: A flag in WritableFileWriter is introduced to remember error has happened. Subsequent operations will fail with an assertion. Those operations, except Close() are not supposed to be called anyway. This change will help catch bug in tests and stress tests and limit damage of a potential bug of continue writing to a file after a failure. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10489 Test Plan: Fix existing unit tests and watch crash tests for a while. Reviewed By: anand1976 Differential Revision: D38473277 fbshipit-source-id: 09aafb971e56cfd7f9ef92ad15b883f54acf1366	2 years ago
Akanksha Mahajan	2acbf386a3	Provide support for direct_reads with async_io (#10197 ) Summary: Provide support for use_direct_reads with async_io. TestPlan: - Updated unit tests - db_bench: Results in https://github.com/facebook/rocksdb/pull/10197#issuecomment-1159239420 - db_stress ``` export CRASH_TEST_EXT_ARGS=" --async_io=1 --use_direct_reads=1" make crash_test -j ``` - Ran db_bench on previous RocksDB version before any async_io implementation (as there have many changes in different PRs in this area) https://github.com/facebook/rocksdb/pull/10197#issuecomment-1160781563. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10197 Reviewed By: anand1976 Differential Revision: D37255646 Pulled By: akankshamahajan15 fbshipit-source-id: fec61ae15bf4d625f79dea56e4f86e0e307ba920	2 years ago
Bo Wang	c073ed7601	Fix typo in comments and code (#10233 ) Summary: Fix typo in comments and code. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10233 Test Plan: Existing unit tests should pass. Reviewed By: jay-zhuang, anand1976 Differential Revision: D37356702 Pulled By: gitbw95 fbshipit-source-id: 32c019adcc6dcc95a9882b38147a310091368e51	3 years ago
Andrew Kryczka	d5d8920f2c	Fix race condition with WAL tracking and `FlushWAL(true /* sync /)` (#10185 ) Summary: `FlushWAL(true / sync */)` is used internally and for manual WAL sync. It had a bug when used together with `track_and_verify_wals_in_manifest` where the synced size tracked in MANIFEST was larger than the number of bytes actually synced. The bug could be repro'd almost immediately with the following crash test command: `python3 tools/db_crashtest.py blackbox --simple --write_buffer_size=524288 --max_bytes_for_level_base=2097152 --target_file_size_base=524288 --duration=3600 --interval=10 --sync_fault_injection=1 --disable_wal=0 --checkpoint_one_in=1000 --max_key=10000 --value_size_mult=33`. An example error message produced by the above command is shown below. The error sometimes arose from the checkpoint and other times arose from the main stress test DB. ``` Corruption: Size mismatch: WAL (log number: 119) in MANIFEST is 27938 bytes , but actually is 27859 bytes on disk. ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/10185 Test Plan: - repro unit test - the above crash test command no longer finds the error. It does find a different error after a while longer such as "Corruption: WAL file 481 required by manifest but not in directory list" Reviewed By: riversand963 Differential Revision: D37200993 Pulled By: ajkr fbshipit-source-id: 98e0071c1a89f4d009888512ed89f9219779ae5f	3 years ago
Hui Xiao	a5d773e077	Add rate-limiting support to batched MultiGet() (#10159 ) Summary: Context/Summary: https://github.com/facebook/rocksdb/pull/9424 added rate-limiting support for user reads, which does not include batched `MultiGet()`s that call `RandomAccessFileReader::MultiRead()`. The reason is that it's harder (compared with RandomAccessFileReader::Read()) to implement the ideal rate-limiting where we first call `RateLimiter::RequestToken()` for allowed bytes to multi-read and then consume those bytes by satisfying as many requests in `MultiRead()` as possible. For example, it can be tricky to decide whether we want partially fulfilled requests within one `MultiRead()` or not. However, due to a recent urgent user request, we decide to pursue an elementary (but a conditionally ineffective) solution where we accumulate enough rate limiter requests toward the total bytes needed by one `MultiRead()` before doing that `MultiRead()`. This is not ideal when the total bytes are huge as we will actually consume a huge bandwidth from rate-limiter causing a burst on disk. This is not what we ultimately want with rate limiter. Therefore a follow-up work is noted through TODO comments. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10159 Test Plan: - Modified existing unit test `DBRateLimiterOnReadTest/DBRateLimiterOnReadTest.NewMultiGet` - Traced the underlying system calls `io_uring_enter` and verified they are 10 seconds apart from each other correctly under the setting of `strace -ftt -e trace=io_uring_enter ./db_bench -benchmarks=multireadrandom -db=/dev/shm/testdb2 -readonly -num=50 -threads=1 -multiread_batched=1 -batch_size=100 -duration=10 -rate_limiter_bytes_per_sec=200 -rate_limiter_refill_period_us=1000000 -rate_limit_bg_reads=1 -disable_auto_compactions=1 -rate_limit_user_ops=1` where each `MultiRead()` read about 2000 bytes (inspected by debugger) and the rate limiter grants 200 bytes per seconds. - Stress test: - Verified `./db_stress (-test_cf_consistency=1/test_batches_snapshots=1) -use_multiget=1 -cache_size=1048576 -rate_limiter_bytes_per_sec=10241024 -rate_limit_bg_reads=1 -rate_limit_user_ops=1` work Reviewed By: ajkr, anand1976 Differential Revision: D37135172 Pulled By: hx235 fbshipit-source-id: 73b8e8f14761e5d4b77235dfe5d41f4eea968bcd	3 years ago
Akanksha Mahajan	8353ae8b27	Add few optimizations in async_io for short scans (#10140 ) Summary: This PR adds few optimizations for async_io for shorter scans. 1. If async_io is enabled, seek would create FilePrefetchBuffer object to fetch the data asynchronously. However `FilePrefetchbuffer::num_file_reads_` wasn't taken into consideration if it calls Next after Seek and would go for Prefetching. This PR fixes that and Next will go for prefetching only if `FilePrefetchbuffer::num_file_reads_` is greater than 2 along with if blocks are sequential. This scenario is only for implicit auto readahead. 2. For seek, when it calls TryReadFromCacheAsync to poll it makes async call as well because TryReadFromCacheAsync flow wasn't changed. So I updated to return after poll instead of further prefetching any data. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10140 Test Plan: 1. Added a unit test 2. Ran crash_test with async_io = 1 to make sure nothing crashes. Reviewed By: anand1976 Differential Revision: D37042242 Pulled By: akankshamahajan15 fbshipit-source-id: b8e6b7cb2ee0886f37a8f53951948b9084e8ffda	3 years ago
zczhu	b6de139df5	Handle "NotSupported" status by default implementation of Close() in … (#10127 ) Summary: The default implementation of Close() function in Directory/FSDirectory classes returns `NotSupported` status. However, we don't want operations that worked in older versions to begin failing after upgrading when run on FileSystems that have not implemented Directory::Close() yet. So we require the upper level that calls Close() function should properly handle "NotSupported" status instead of treating it as an error status. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10127 Reviewed By: ajkr Differential Revision: D36971112 Pulled By: littlepig2013 fbshipit-source-id: 100f0e6ad1191e1acc1ba6458c566a11724cf466	3 years ago
Yanqin Jin	d739de63e5	Fix a bug in WAL tracking (#10087 ) Summary: Closing https://github.com/facebook/rocksdb/issues/10080 When `SyncWAL()` calls `MarkLogsSynced()`, even if there is only one active WAL file, this event should still be added to the MANIFEST. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10087 Test Plan: make check Reviewed By: ajkr Differential Revision: D36797580 Pulled By: riversand963 fbshipit-source-id: 24184c9dd606b3939a454ed41de6e868d1519999	3 years ago
Zichen Zhu	65893ad959	Explicitly closing all directory file descriptors (#10049 ) Summary: Currently, the DB directory file descriptor is left open until the deconstruction process (`DB::Close()` does not close the file descriptor). To verify this, comment out the lines between `db_ = nullptr` and `db_->Close()` (line 512, 513, 514, 515 in ldb_cmd.cc) to leak the ``db_'' object, build `ldb` tool and run ``` strace --trace=open,openat,close ./ldb --db=$TEST_TMPDIR --ignore_unknown_options put K1 V1 --create_if_missing ``` There is one directory file descriptor that is not closed in the strace log. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10049 Test Plan: Add a new unit test DBBasicTest.DBCloseAllDirectoryFDs: Open a database with different WAL directory and three different data directories, and all directory file descriptors should be closed after calling Close(). Explicitly call Close() after a directory file descriptor is not used so that the counter of directory open and close should be equivalent. Reviewed By: ajkr, hx235 Differential Revision: D36722135 Pulled By: littlepig2013 fbshipit-source-id: 07bdc2abc417c6b30997b9bbef1f79aa757b21ff	3 years ago
Akanksha Mahajan	28ea1fb44a	Provide support for IOTracing for ReadAsync API (#9833 ) Summary: Same as title Pull Request resolved: https://github.com/facebook/rocksdb/pull/9833 Test Plan: Add unit test and manually check the output of tracing logs For fixed readahead_size it logs as: ``` Access Time : 193352113447923 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 15075 , IO Status: OK, Length: 12288, Offset: 659456 Access Time : 193352113465232 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 14425 , IO Status: OK, Length: 12288, Offset: 671744 Access Time : 193352113481539 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 13062 , IO Status: OK, Length: 12288, Offset: 684032 Access Time : 193352113497692 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 13649 , IO Status: OK, Length: 12288, Offset: 696320 Access Time : 193352113520043 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 19384 , IO Status: OK, Length: 12288, Offset: 708608 Access Time : 193352113538401 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 15406 , IO Status: OK, Length: 12288, Offset: 720896 Access Time : 193352113554855 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 13670 , IO Status: OK, Length: 12288, Offset: 733184 Access Time : 193352113571624 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 13855 , IO Status: OK, Length: 12288, Offset: 745472 Access Time : 193352113587924 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 13953 , IO Status: OK, Length: 12288, Offset: 757760 Access Time : 193352113603285 , File Name: 000026.sst , File Operation: Prefetch , Latency: 59 , IO Status: Not implemented: Prefetch not supported, Length: 8868, Offset: 898349 ``` For implicit readahead: ``` Access Time : 193351865156587 , File Name: 000026.sst , File Operation: Prefetch , Latency: 48 , IO Status: Not implemented: Prefetch not supported, Length: 12266, Offset: 391174 Access Time : 193351865160354 , File Name: 000026.sst , File Operation: Prefetch , Latency: 51 , IO Status: Not implemented: Prefetch not supported, Length: 12266, Offset: 395248 Access Time : 193351865164253 , File Name: 000026.sst , File Operation: Prefetch , Latency: 49 , IO Status: Not implemented: Prefetch not supported, Length: 12266, Offset: 399322 Access Time : 193351865165461 , File Name: 000026.sst , File Operation: ReadAsync , Latency: 222871 , IO Status: OK, Length: 135168, Offset: 401408 ``` Reviewed By: anand1976 Differential Revision: D35601634 Pulled By: akankshamahajan15 fbshipit-source-id: 5a4f32a850af878efa0767bd5706380152a1f26e	3 years ago
Changyu Bi	8515bd50c9	Support read rate-limiting in SequentialFileReader (#9973 ) Summary: Added rate limiter and read rate-limiting support to SequentialFileReader. I've updated call sites to SequentialFileReader::Read with appropriate IO priority (or left a TODO and specified IO_TOTAL for now). The PR is separated into four commits: the first one added the rate-limiting support, but with some fixes in the unit test since the number of request bytes from rate limiter in SequentialFileReader are not accurate (there is overcharge at EOF). The second commit fixed this by allowing SequentialFileReader to check file size and determine how many bytes are left in the file to read. The third commit added benchmark related code. The fourth commit moved the logic of using file size to avoid overcharging the rate limiter into backup engine (the main user of SequentialFileReader). Pull Request resolved: https://github.com/facebook/rocksdb/pull/9973 Test Plan: - `make check`, backup_engine_test covers usage of SequentialFileReader with rate limiter. - Run db_bench to check if rate limiting is throttling as expected: Verified that reads and writes are together throttled at 2MB/s, and at 0.2MB chunks that are 100ms apart. - Set up: `./db_bench --benchmarks=fillrandom -db=/dev/shm/test_rocksdb` - Benchmark: ``` strace -ttfe read,write ./db_bench --benchmarks=backup -db=/dev/shm/test_rocksdb --backup_rate_limit=2097152 --use_existing_db strace -ttfe read,write ./db_bench --benchmarks=restore -db=/dev/shm/test_rocksdb --restore_rate_limit=2097152 --use_existing_db ``` - db bench on backup and restore to ensure no performance regression. - backup (avg over 50 runs): pre-change: 1.90443e+06 micros/op; post-change: 1.8993e+06 micros/op (improve by 0.2%) - restore (avg over 50 runs): pre-change: 1.79105e+06 micros/op; post-change: 1.78192e+06 micros/op (improve by 0.5%) ``` # Set up ./db_bench --benchmarks=fillrandom -db=/tmp/test_rocksdb -num=10000000 # benchmark TEST_TMPDIR=/tmp/test_rocksdb NUM_RUN=50 for ((j=0;j<$NUM_RUN;j++)) do ./db_bench -db=$TEST_TMPDIR -num=10000000 -benchmarks=backup -use_existing_db \| egrep 'backup' # Restore #./db_bench -db=$TEST_TMPDIR -num=10000000 -benchmarks=restore -use_existing_db done > rate_limit.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)}' rate_limit.txt >> rate_limit_2.txt ``` Reviewed By: hx235 Differential Revision: D36327418 Pulled By: cbi42 fbshipit-source-id: e75d4307cff815945482df5ba630c1e88d064691	3 years ago
Akanksha Mahajan	a479c2c2b2	Fix stress test failure "Corruption: checksum mismatch" or "Iterator Diverged" with async_io enabled (#10032 ) Summary: In case of non sequential reads with `async_io`, `FilePRefetchBuffer::TryReadFromCacheAsync` can be called for previous blocks with `offset < bufs_[curr_].offset_` which wasn't handled correctly resulting wrong data being returned from buffer. Since `FilePRefetchBuffer::PrefetchAsync` can be called for any data block, it sets `prev_len_` to 0 indicating `FilePRefetchBuffer::TryReadFromCacheAsync` to go for the prefetching even though offset < bufs_[curr_].offset_ This is because async prefetching is always done in second buffer (to avoid mutex) even though curr_ is empty leading to offset < bufs_[curr_].offset_ in some cases. If prev_len_ is non zero then `TryReadFromCacheAsync` returns false if `offset < bufs_[curr_].offset_ && prev_len != 0` indicating reads are not sequential and previous call wasn't PrefetchAsync. - This PR also simplifies `FilePRefetchBuffer::TryReadFromCacheAsync` as it was getting complicated covering different scenarios based on `async_io` enabled/disabled. If `for_compaction` is set true, it now calls `FilePRefetchBufferTryReadFromCache` following synchronous flow as before. Its decided in BlockFetcher.cc Pull Request resolved: https://github.com/facebook/rocksdb/pull/10032 Test Plan: 1. export CRASH_TEST_EXT_ARGS=" --async_io=1" make crash_test -j completed successfully locally 2. make crash_test -j completed successfully locally 3. Reran CircleCi mini crashtest job 4 - 5 times. 4. Updated prefetch_test for more coverage. Reviewed By: anand1976 Differential Revision: D36579858 Pulled By: akankshamahajan15 fbshipit-source-id: 0c428d62b45e12e082a83acf533a5e37a584bedf	3 years ago
Akanksha Mahajan	2db6a4a1d6	Seek parallelization (#9994 ) Summary: The RocksDB iterator is a hierarchy of iterators. MergingIterator maintains a heap of LevelIterators, one for each L0 file and for each non-zero level. The Seek() operation naturally lends itself to parallelization, as it involves positioning every LevelIterator on the correct data block in the correct SST file. It lookups a level for a target key, to find the first key that's >= the target key. This typically involves reading one data block that is likely to contain the target key, and scan forward to find the first valid key. The forward scan may read more data blocks. In order to find the right data block, the iterator may read some metadata blocks (required for opening a file and searching the index). This flow can be parallelized. Design: Seek will be called two times under async_io option. First seek will send asynchronous request to prefetch the data blocks at each level and second seek will follow the normal flow and in FilePrefetchBuffer::TryReadFromCacheAsync it will wait for the Poll() to get the results and add the iterator to min_heap. - Status::TryAgain is passed down from FilePrefetchBuffer::PrefetchAsync to block_iter_.Status indicating asynchronous request has been submitted. - If for some reason asynchronous request returns error in submitting the request, it will fallback to sequential reading of blocks in one pass. - If the data already exists in prefetch_buffer, it will return the data without prefetching further and it will be treated as single pass of seek. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9994 Test Plan: - Run Regressions. ``` ./db_bench -db=/tmp/prefix_scan_prefetch_main -benchmarks="fillseq" -key_size=32 -value_size=512 -num=5000000 -use_direct_io_for_flush_and_compaction=true -target_file_size_base=16777216 ``` i) Previous release 7.0 run for normal prefetching with async_io disabled: ``` ./db_bench -use_existing_db=true -db=/tmp/prefix_scan_prefetch_main -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=5000000 -use_direct_reads=true -seek_nexts=327680 -duration=120 -ops_between_duration_checks=1 Initializing RocksDB Options from the specified file Initializing RocksDB Options from command-line flags RocksDB: version 7.0 Date: Thu Mar 17 13:11:34 2022 CPU: 24 * Intel Core Processor (Broadwell) CPUCache: 16384 KB Keys: 32 bytes each (+ 0 bytes user-defined timestamp) Values: 512 bytes each (256 bytes after compression) Entries: 5000000 Prefix: 0 bytes Keys per prefix: 0 RawSize: 2594.0 MB (estimated) FileSize: 1373.3 MB (estimated) Write rate: 0 bytes/second Read rate: 0 ops/second Compression: Snappy Compression sampling rate: 0 Memtablerep: SkipListFactory Perf Level: 1 ------------------------------------------------ DB path: [/tmp/prefix_scan_prefetch_main] seekrandom : 483618.390 micros/op 2 ops/sec; 338.9 MB/s (249 of 249 found) ``` ii) normal prefetching after changes with async_io disable: ``` ./db_bench -use_existing_db=true -db=/tmp/prefix_scan_prefetch_main -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=5000000 -use_direct_reads=true -seek_nexts=327680 -duration=120 -ops_between_duration_checks=1 Set seed to 1652922591315307 because --seed was 0 Initializing RocksDB Options from the specified file Initializing RocksDB Options from command-line flags RocksDB: version 7.3 Date: Wed May 18 18:09:51 2022 CPU: 32 * Intel Xeon Processor (Skylake) CPUCache: 16384 KB Keys: 32 bytes each (+ 0 bytes user-defined timestamp) Values: 512 bytes each (256 bytes after compression) Entries: 5000000 Prefix: 0 bytes Keys per prefix: 0 RawSize: 2594.0 MB (estimated) FileSize: 1373.3 MB (estimated) Write rate: 0 bytes/second Read rate: 0 ops/second Compression: Snappy Compression sampling rate: 0 Memtablerep: SkipListFactory Perf Level: 1 ------------------------------------------------ DB path: [/tmp/prefix_scan_prefetch_main] seekrandom : 483080.466 micros/op 2 ops/sec 120.287 seconds 249 operations; 340.8 MB/s (249 of 249 found) ``` iii) db_bench with async_io enabled completed succesfully ``` ./db_bench -use_existing_db=true -db=/tmp/prefix_scan_prefetch_main -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=5000000 -use_direct_reads=true -seek_nexts=327680 -duration=120 -ops_between_duration_checks=1 -async_io=1 -adaptive_readahead=1 Set seed to 1652924062021732 because --seed was 0 Initializing RocksDB Options from the specified file Initializing RocksDB Options from command-line flags RocksDB: version 7.3 Date: Wed May 18 18:34:22 2022 CPU: 32 * Intel Xeon Processor (Skylake) CPUCache: 16384 KB Keys: 32 bytes each (+ 0 bytes user-defined timestamp) Values: 512 bytes each (256 bytes after compression) Entries: 5000000 Prefix: 0 bytes Keys per prefix: 0 RawSize: 2594.0 MB (estimated) FileSize: 1373.3 MB (estimated) Write rate: 0 bytes/second Read rate: 0 ops/second Compression: Snappy Compression sampling rate: 0 Memtablerep: SkipListFactory Perf Level: 1 ------------------------------------------------ DB path: [/tmp/prefix_scan_prefetch_main] seekrandom : 553913.576 micros/op 1 ops/sec 120.199 seconds 217 operations; 293.6 MB/s (217 of 217 found) ``` - db_stress with async_io disabled completed succesfully ``` export CRASH_TEST_EXT_ARGS=" --async_io=0" make crash_test -j ``` In Progress: db_stress with async_io is failing and working on debugging/fixing it. Reviewed By: anand1976 Differential Revision: D36459323 Pulled By: akankshamahajan15 fbshipit-source-id: abb1cd944abe712bae3986ae5b16704b3338917c	3 years ago
Bo Wang	5be1579ead	Address comments for PR #9988 and #9996 (#10020 ) Summary: 1. The latest change of DecideRateLimiterPriority in https://github.com/facebook/rocksdb/pull/9988 is reverted. 2. For https://github.com/facebook/rocksdb/blob/main/db/builder.cc#L345-L349 2.1. Remove `we will regrad this verification as user reads` from the comments. 2.2. `Do not set` the read_options.rate_limiter_priority to Env::IO_USER . Flush should be a background job. 2.3. Update db_rate_limiter_test.cc. 3. In IOOptions, mark `prio` as deprecated for future removal. 4. In `file_system.h`, mark `IOPriority` as deprecated for future removal. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10020 Test Plan: Unit tests. Reviewed By: ajkr Differential Revision: D36525317 Pulled By: gitbw95 fbshipit-source-id: 011ba421822f8a124e6d25a2661c4e242df6ad36	3 years ago

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213 Commits (oxigraph-main)