mirror of https://github.com/facebook/rocksdb.git
404 Commits
| Author | SHA1 | Message | Date |
|---|---|---|---|
Peter Dillinger
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ac24f152a1 |
Refactor `table_factory` into MutableCFOptions (#13077)
Summary: This is setting up for a fix to a data race in SetOptions on BlockBasedTableOptions (BBTO), https://github.com/facebook/rocksdb/issues/10079 The race will be fixed by replacing `table_factory` with a modified copy whenever we want to modify a BBTO field. An argument could be made that this change creates more entaglement between features (e.g. BlobSource <-> MutableCFOptions), rather than (conceptually) minimizing the dependencies of each feature, but * Most of these things already depended on ImmutableOptions * Historically there has been a lot of plumbing (and possible small CPU overhead) involved in adding features that need to reach a lot of places, like `block_protection_bytes_per_key`. Keeping those wrapped up in options simplifies that. * SuperVersion management generally takes care of lifetime management of MutableCFOptions, so is not that difficult. (Crash test agrees so far.) There are some FIXME places where it is known to be unsafe to replace `block_cache` unless/until we handle shared_ptr tracking properly. HOWEVER, replacing `block_cache` is generally dubious, at least while existing users of the old block cache (e.g. table readers) can continue indefinitely. The change to cf_options.cc is essentially just moving code (not changing). I'm not concerned about the performance of copying another shared_ptr with MutableCFOptions, but I left a note about considering an improvement if more shared_ptr are added to it. Pull Request resolved: https://github.com/facebook/rocksdb/pull/13077 Test Plan: existing tests, crash test. Unit test DBOptionsTest.GetLatestCFOptions updated with some temporary logic. MemoryTest required some refactoring (simplification) for the change. Reviewed By: cbi42 Differential Revision: D64546903 Pulled By: pdillinger fbshipit-source-id: 69ae97ce5cf4c01b58edc4c5d4687eb1e5bf5855 |
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Peter Dillinger
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351d2fd2b6 |
Make simple BlockBasedTableOptions mutable (#10021)
Summary: In theory, there should be no danger in mutability, as table builders and readers work from copies of BlockBasedTableOptions. However, there is currently an unresolved read-write race that affecting SetOptions on BBTO fields. This should be generally acceptable for non-pointer options of 64 bits or less, but a fix is needed to make it mutability general here. See https://github.com/facebook/rocksdb/issues/10079 This change systematically sets all of those "simple" options (and future such options) as mutable. (Resurrecting this PR perhaps preferable to proposed https://github.com/facebook/rocksdb/issues/13063) Pull Request resolved: https://github.com/facebook/rocksdb/pull/10021 Test Plan: Some unit test updates. XXX comment added to stress test code Reviewed By: cbi42 Differential Revision: D64360967 Pulled By: pdillinger fbshipit-source-id: ff220fa778331852fe331b42b76ac4adfcd2d760 |
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Peter Dillinger
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79790cf2a8 |
Bug fix and test BuildDBOptions (#13038)
Summary: The following DBOptions were not being propagated through BuildDBOptions, which could at least lead to settings being lost through `GetOptionsFromString()`, possibly elsewhere as well: * background_close_inactive_wals * write_dbid_to_manifest * write_identity_file * prefix_seek_opt_in_only Pull Request resolved: https://github.com/facebook/rocksdb/pull/13038 Test Plan: This problem was not being caught by OptionsSettableTest.DBOptionsAllFieldsSettable when the option was omitted from both options_helper.cc and options_settable_test.cc. I have added to the test to catch future instances (and the updated test was how I found three of the four missing options). The same kind of bug seems to be caught by ColumnFamilyOptionsAllFieldsSettable, and AFAIK analogous code does not exist for BlockBasedTableOptions. Reviewed By: ltamasi Differential Revision: D63483779 Pulled By: pdillinger fbshipit-source-id: a5d5f6e434174bacb8e5d251b767e81e62b7225a |
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Peter Dillinger
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a1a102ffce |
Steps toward deprecating implicit prefix seek, related fixes (#13026)
Summary: With some new use cases onboarding to prefix extractors/seek/filters, one of the risks is existing iterator code, e.g. for maintenance tasks, being unintentionally subject to prefix seek semantics. This is a longstanding known design flaw with prefix seek, and `prefix_same_as_start` and `auto_prefix_mode` were steps in the direction of making that obsolete. However, we can't just immediately set `total_order_seek` to true by default, because that would impact so much code instantly. Here we add a new DB option, `prefix_seek_opt_in_only` that basically allows users to transition to the future behavior when they are ready. When set to true, all iterators will be treated as if `total_order_seek=true` and then the only ways to get prefix seek semantics are with `prefix_same_as_start` or `auto_prefix_mode`. Related fixes / changes: * Make sure that `prefix_same_as_start` and `auto_prefix_mode` are compatible with (or override) `total_order_seek` (depending on your interpretation). * Fix a bug in which a new iterator after dynamically changing the prefix extractor might mix different prefix semantics between memtable and SSTs. Both should use the latest extractor semantics, which means iterators ignoring memtable prefix filters with an old extractor. And that means passing the latest prefix extractor to new memtable iterators that might use prefix seek. (Without the fix, the test added for this fails in many ways.) Suggested follow-up: * Investigate a FIXME where a MergeIteratorBuilder is created in db_impl.cc. No unit test detects a change in value that should impact correctness. * Make memtable prefix bloom compatible with `auto_prefix_mode`, which might require involving the memtablereps because we don't know at iterator creation time (only seek time) whether an auto_prefix_mode seek will be a prefix seek. * Add `prefix_same_as_start` testing to db_stress Pull Request resolved: https://github.com/facebook/rocksdb/pull/13026 Test Plan: tests updated, added. Add combination of `total_order_seek=true` and `auto_prefix_mode=true` to stress test. Ran `make blackbox_crash_test` for a long while. Manually ran tests with `prefix_seek_opt_in_only=true` as default, looking for unexpected issues. I inspected most of the results and migrated many tests to be ready for such a change (but not all). Reviewed By: ltamasi Differential Revision: D63147378 Pulled By: pdillinger fbshipit-source-id: 1f4477b730683d43b4be7e933338583702d3c25e |
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anand76
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6549b11714 |
Make Cache a customizable class (#13024)
Summary: This PR allows a Cache object to be created using the object registry. Pull Request resolved: https://github.com/facebook/rocksdb/pull/13024 Reviewed By: pdillinger Differential Revision: D63043233 Pulled By: anand1976 fbshipit-source-id: 5bc3f7c29b35ad62638ff8205451303e2cecea9d |
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Peter Dillinger
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98c33cb8e3 |
Steps toward making IDENTITY file obsolete (#13019)
Summary: * Set write_dbid_to_manifest=true by default * Add new option write_identity_file (default true) that allows us to opt-in to future behavior without identity file * Refactor related DB open code to minimize code duplication _Recommend hiding whitespace changes for review_ Intended follow-up: add support to ldb for reading and even replacing the DB identity in the manifest. Could be a variant of `update_manifest` command or based on it. Pull Request resolved: https://github.com/facebook/rocksdb/pull/13019 Test Plan: unit tests and stress test updated for new functionality Reviewed By: anand1976 Differential Revision: D62898229 Pulled By: pdillinger fbshipit-source-id: c08b25cf790610b034e51a9de0dc78b921abbcf0 |
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Peter Dillinger
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4b1d595306 |
Fix and clarify ignore_unknown_options (#12989)
Summary: `ignore_unknown_options=true` had an undocumented behavior of having no effect (disallow unknown options) if reading from the same or older major.minor version. Presumably this was intended to catch unintentional addition of new options in a patch release, but there is no automated version compatibility testing between patch releases. So this was a bad choice without such testing support, because it just means users would hit the failure in case of adding features to a patch release. In this diff we respect ignore_unknown_options when reading a file from any newer version, even patch versions, and document this behavior in the API. I don't think it's practical or necessary to test among patch releases in check_format_compatible.sh. This seems like an exceptional case of applying a *different semantics* to patch version updates than to minor/major versions. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12989 Test Plan: unit test updated (and refactored) Reviewed By: jaykorean Differential Revision: D62168738 Pulled By: pdillinger fbshipit-source-id: fb3c3ef30f0bbad0d5ffcc4570fb9ef963e7daac |
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Peter Dillinger
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96340dbce2 |
Options for file temperature for more files (#12957)
Summary: We have a request to use the cold tier as primary source of truth for the DB, and to best support such use cases and to complement the existing options controlling SST file temperatures, we add two new DB options: * `metadata_write_temperature` for DB "small" files that don't contain much user data * `wal_write_temperature` for WALs. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12957 Test Plan: Unit test included, though it's hard to be sure we've covered all the places Reviewed By: jowlyzhang Differential Revision: D61664815 Pulled By: pdillinger fbshipit-source-id: 8e19c9dd8fd2db059bb15f74938d6bc12002e82b |
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Changyu Bi
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defd97bc9d |
Add an option to verify memtable key order during reads (#12889)
Summary: add a new CF option `paranoid_memory_checks` that allows additional data integrity validations during read/scan. Currently, skiplist-based memtable will validate the order of keys visited. Further data validation can be added in different layers. The option will be opt-in due to performance overhead. The motivation for this feature is for services where data correctness is critical and want to detect in-memory corruption earlier. For a corrupted memtable key, this feature can help to detect it during during reads instead of during flush with existing protections (OutputValidator that verifies key order or per kv checksum). See internally linked task for more context. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12889 Test Plan: * new unit test added for paranoid_memory_checks=true. * existing unit test for paranoid_memory_checks=false. * enable in stress test. Performance Benchmark: we check for performance regression in read path where data is in memtable only. For each benchmark, the script was run at the same time for main and this PR: * Memtable-only randomread ops/sec: ``` (for I in $(seq 1 50);do ./db_bench --benchmarks=fillseq,readrandom --write_buffer_size=268435456 --writes=250000 --num=250000 --reads=500000 --seed=1723056275 2>&1 | grep "readrandom"; done;) | awk '{ t += $5; c++; print } END { print 1.0 * t / c }'; Main: 608146 PR with paranoid_memory_checks=false: 607727 (- %0.07) PR with paranoid_memory_checks=true: 521889 (-%14.2) ``` * Memtable-only sequential scan ops/sec: ``` (for I in $(seq 1 50); do ./db_bench--benchmarks=fillseq,readseq[-X10] --write_buffer_size=268435456 --num=1000000 --seed=1723056275 2>1 | grep "\[AVG 10 runs\]"; done;) | awk '{ t += $6; c++; print; } END { printf "%.0f\n", 1.0 * t / c }'; Main: 9180077 PR with paranoid_memory_checks=false: 9536241 (+%3.8) PR with paranoid_memory_checks=true: 7653934 (-%16.6) ``` * Memtable-only reverse scan ops/sec: ``` (for I in $(seq 1 20); do ./db_bench --benchmarks=fillseq,readreverse[-X10] --write_buffer_size=268435456 --num=1000000 --seed=1723056275 2>1 | grep "\[AVG 10 runs\]"; done;) | awk '{ t += $6; c++; print; } END { printf "%.0f\n", 1.0 * t / c }'; Main: 1285719 PR with integrity_checks=false: 1431626 (+%11.3) PR with integrity_checks=true: 811031 (-%36.9) ``` The `readrandom` benchmark shows no regression. The scanning benchmarks show improvement that I can't explain. Reviewed By: pdillinger Differential Revision: D60414267 Pulled By: cbi42 fbshipit-source-id: a70b0cbeea131f1a249a5f78f9dc3a62dacfaa91 |
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Peter Dillinger
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4d3518951a |
Option to decouple index and filter partitions (#12939)
Summary: Partitioned metadata blocks were introduced back in 2017 to deal more gracefully with large DBs where RAM is relatively scarce and some data might be much colder than other data. The feature allows metadata blocks to compete for memory in the block cache against data blocks while alleviating tail latencies and thrash conditions that can arise with large metadata blocks (sometimes megabytes each) that can arise with large SST files. In general, the cost to partitioned metadata is more CPU in accesses (especially for filters where more binary search is needed before hashing can be used) and a bit more memory fragmentation and related overheads. However the feature has always had a subtle limitation with a subtle effect on performance: index partitions and filter partitions must be cut at the same time, regardless of which wins the space race (hahaha) to metadata_block_size. Commonly filters will be a few times larger than indexes, so index partitions will be under-sized compared to filter (and data) blocks. While this does affect fragmentation and related overheads a bit, I suspect the bigger impact on performance is in the block cache. The coupling of the partition cuts would be defensible if the binary search done to find the filter block was used (on filter hit) to short-circuit binary search to an index partition, but that optimization has not been developed. Consider two metadata blocks, an under-sized one and a normal-sized one, covering proportional sections of the key space with the same density of read queries. The under-sized one will be more prone to eviction from block cache because it is used less often. This is unfair because of its despite its proportionally smaller cost of keeping in block cache, and most of the cost of a miss to re-load it (random IO) is not proportional to the size (similar latency etc. up to ~32KB). ## This change Adds a new table option decouple_partitioned_filters allows filter blocks and index blocks to be cut independently. To make this work, the partitioned filter block builder needs to know about the previous key, to generate an appropriate separator for the partition index. In most cases, BlockBasedTableBuilder already has easy access to the previous key to provide to the filter block builder. This change includes refactoring to pass that previous key to the filter builder when available, with the filter building caching the previous key itself when unavailable, such as during compression dictionary training and some unit tests. Access to the previous key eliminates the need to track the previous prefix, which results in a small SST construction CPU win in prefix filtering cases, regardless of coupling, and possibly a small regression for some non-prefix cases, regardless of coupling, but still overall improvement especially with https://github.com/facebook/rocksdb/issues/12931. Suggested follow-up: * Update confusing use of "last key" to refer to "previous key" * Expand unit test coverage with parallel compression and dictionary training * Consider an option or enhancement to alleviate under-sized metadata blocks "at the end" of an SST file due to no coordination or awareness of when files are cut. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12939 Test Plan: unit tests updated. Also did some unit test runs with "hard wired" usage of parallel compression and dictionary training code paths to ensure they were working. Also ran blackbox_crash_test for a while with the new feature. ## SST write performance (CPU) Using the same testing setup as in https://github.com/facebook/rocksdb/issues/12931 but with -decouple_partitioned_filters=1 in the "after" configuration, which benchmarking shows makes almost no difference in terms of SST write CPU. "After" vs. "before" this PR ``` -partition_index_and_filters=0 -prefix_size=0 -whole_key_filtering=1 923691 vs. 924851 (-0.13%) -partition_index_and_filters=0 -prefix_size=8 -whole_key_filtering=0 921398 vs. 922973 (-0.17%) -partition_index_and_filters=0 -prefix_size=8 -whole_key_filtering=1 902259 vs. 908756 (-0.71%) -partition_index_and_filters=1 -prefix_size=8 -whole_key_filtering=0 917932 vs. 916901 (+0.60%) -partition_index_and_filters=1 -prefix_size=8 -whole_key_filtering=0 912755 vs. 907298 (+0.60%) -partition_index_and_filters=1 -prefix_size=8 -whole_key_filtering=1 899754 vs. 892433 (+0.82%) ``` I think this is a pretty good trade, especially in attracting more movement toward partitioned configurations. ## Read performance Let's see how decoupling affects read performance across various degrees of memory constraint. To simplify LSM structure, we're using FIFO compaction. Since decoupling will overall increase metadata block size, we control for this somewhat with an extra "before" configuration with larger metadata block size setting (8k instead of 4k). Basic setup: ``` (for CS in 0300 1200; do TEST_TMPDIR=/dev/shm/rocksdb1 ./db_bench -benchmarks=fillrandom,flush,readrandom,block_cache_entry_stats -num=5000000 -duration=30 -disable_wal=1 -write_buffer_size=30000000 -bloom_bits=10 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -partition_index_and_filters=1 -statistics=1 -cache_size=${CS}000000 -metadata_block_size=4096 -decouple_partitioned_filters=1 2>&1 | tee results-$CS; done) ``` And read ops/s results: ```CSV Cache size MB,After/decoupled/4k,Before/4k,Before/8k 3,15593,15158,12826 6,16295,16693,14134 10,20427,20813,18459 20,27035,26836,27384 30,33250,31810,33846 60,35518,32585,35329 100,36612,31805,35292 300,35780,31492,35481 1000,34145,31551,35411 1100,35219,31380,34302 1200,35060,31037,34322 ``` If you graph this with log scale on the X axis (internal link: https://pxl.cl/5qKRc), you see that the decoupled/4k configuration is essentially the best of both the before/4k and before/8k configurations: handles really tight memory closer to the old 4k configuration and handles generous memory closer to the old 8k configuration. Reviewed By: jowlyzhang Differential Revision: D61376772 Pulled By: pdillinger fbshipit-source-id: fc2af2aee44290e2d9620f79651a30640799e01f |
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Yu Zhang
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2e1b3f921f |
Remove unreachable code (#12846)
Summary: Removing some unreachable code. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12846 Reviewed By: cbi42 Differential Revision: D59498423 Pulled By: jowlyzhang fbshipit-source-id: 6b2c51732d94b1f69a8ba7474b16a171d4e6d640 |
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Peter Dillinger
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0646ec6e2d |
Ensure Close() before LinkFile() for WALs in Checkpoint (#12734)
Summary: POSIX semantics for LinkFile (hard links) allow linking a file that is still being written two, with both the source and destination showing any subsequent writes to the source. This may not be practical semantics for some FileSystem implementations such as remote storage. They might only link the flushed or sync-ed file contents at time of LinkFile, or might even have undefined behavior if LinkFile is called on a file still open for write (not yet "sealed"). This change builds on https://github.com/facebook/rocksdb/issues/12731 to bring more hygiene to our handling of WAL files in Checkpoint. Specifically, we now Close WAL files as soon as they are either (a) inactive and fully synced, or (b) inactive and obsolete (so maybe never fully synced), rather than letting Close() happen in handling obsolete files (maybe a background thread). This should not be a performance issue as Close() should be trivial cost relative to other IO ops, but just in case: * We don't Close() while holding a mutex, to avoid blocking, and * The old behavior is available with a new kill switch option `background_close_inactive_wals`. Stacked on https://github.com/facebook/rocksdb/issues/12731 Pull Request resolved: https://github.com/facebook/rocksdb/pull/12734 Test Plan: Extended existing unit test, especially adding a hygiene check to FaultInjectionTestFS to detect LinkFile() on a file still open for writes. FaultInjectionTestFS already has relevant tracking data, and tests can opt out of the new check, as in a smoke test I have left for the old, deprecated functionality `background_close_inactive_wals=true`. Also ran lengthy blackbox_crash_test to ensure the hygiene check is OK with the crash test. (The only place I can find we use LinkFile in production is Checkpoint.) Reviewed By: cbi42 Differential Revision: D58295284 Pulled By: pdillinger fbshipit-source-id: 64d90ed8477e2366c19eaf9c4c5ad60b82cac5c6 |
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Peter Dillinger
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b34cef57b7 |
Support pro-actively erasing obsolete block cache entries (#12694)
Summary: Currently, when files become obsolete, the block cache entries associated with them just age out naturally. With pure LRU, this is not too bad, as once you "use" enough cache entries to (re-)fill the cache, you are guranteed to have purged the obsolete entries. However, HyperClockCache is a counting clock cache with a somewhat longer memory, so could be more negatively impacted by previously-hot cache entries becoming obsolete, and taking longer to age out than newer single-hit entries. Part of the reason we still have this natural aging-out is that there's almost no connection between block cache entries and the file they are associated with. Everything is hashed into the same pool(s) of entries with nothing like a secondary index based on file. Keeping track of such an index could be expensive. This change adds a new, mutable CF option `uncache_aggressiveness` for erasing obsolete block cache entries. The process can be speculative, lossy, or unproductive because not all potential block cache entries associated with files will be resident in memory, and attempting to remove them all could be wasted CPU time. Rather than a simple on/off switch, `uncache_aggressiveness` basically tells RocksDB how much CPU you're willing to burn trying to purge obsolete block cache entries. When such efforts are not sufficiently productive for a file, we stop and move on. The option is in ColumnFamilyOptions so that it is dynamically changeable for already-open files, and customizeable by CF. Note that this block cache removal happens as part of the process of purging obsolete files, which is often in a background thread (depending on `background_purge_on_iterator_cleanup` and `avoid_unnecessary_blocking_io` options) rather than along CPU critical paths. Notable auxiliary code details: * Possibly fixing some issues with trivial moves with `only_delete_metadata`: unnecessary TableCache::Evict in that case and missing from the ObsoleteFileInfo move operator. (Not able to reproduce an current failure.) * Remove suspicious TableCache::Erase() from VersionSet::AddObsoleteBlobFile() (TODO follow-up item) Marked EXPERIMENTAL until more thorough validation is complete. Direct stats of this functionality are omitted because they could be misleading. Block cache hit rate is a better indicator of benefit, and CPU profiling a better indicator of cost. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12694 Test Plan: * Unit tests added, including refactoring an existing test to make better use of parameterized tests. * Added to crash test. * Performance, sample command: ``` for I in `seq 1 10`; do for UA in 300; do for CT in lru_cache fixed_hyper_clock_cache auto_hyper_clock_cache; do rm -rf /dev/shm/test3; TEST_TMPDIR=/dev/shm/test3 /usr/bin/time ./db_bench -benchmarks=readwhilewriting -num=13000000 -read_random_exp_range=6 -write_buffer_size=10000000 -bloom_bits=10 -cache_type=$CT -cache_size=390000000 -cache_index_and_filter_blocks=1 -disable_wal=1 -duration=60 -statistics -uncache_aggressiveness=$UA 2>&1 | grep -E 'micros/op|rocksdb.block.cache.data.(hit|miss)|rocksdb.number.keys.(read|written)|maxresident' | awk '/rocksdb.block.cache.data.miss/ { miss = $4 } /rocksdb.block.cache.data.hit/ { hit = $4 } { print } END { print "hit rate = " ((hit * 1.0) / (miss + hit)) }' | tee -a results-$CT-$UA; done; done; done ``` Averaging 10 runs each case, block cache data block hit rates ``` lru_cache UA=0 -> hit rate = 0.327, ops/s = 87668, user CPU sec = 139.0 UA=300 -> hit rate = 0.336, ops/s = 87960, user CPU sec = 139.0 fixed_hyper_clock_cache UA=0 -> hit rate = 0.336, ops/s = 100069, user CPU sec = 139.9 UA=300 -> hit rate = 0.343, ops/s = 100104, user CPU sec = 140.2 auto_hyper_clock_cache UA=0 -> hit rate = 0.336, ops/s = 97580, user CPU sec = 140.5 UA=300 -> hit rate = 0.345, ops/s = 97972, user CPU sec = 139.8 ``` Conclusion: up to roughly 1 percentage point of improved block cache hit rate, likely leading to overall improved efficiency (because the foreground CPU cost of cache misses likely outweighs the background CPU cost of erasure, let alone I/O savings). Reviewed By: ajkr Differential Revision: D57932442 Pulled By: pdillinger fbshipit-source-id: 84a243ca5f965f731f346a4853009780a904af6c |
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Hui Xiao
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390fc55ba1 |
Revert PR 12684 and 12556 (#12738)
Summary: **Context/Summary:** a better API design is decided lately so we decided to revert these two changes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12738 Test Plan: - CI Reviewed By: ajkr Differential Revision: D58162165 Pulled By: hx235 fbshipit-source-id: 9bbe4d2fe9fbe39213f4cf137a2d419e6ffb8e16 |
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Changyu Bi
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fecb10c2fa |
Improve universal compaction sorted-run trigger (#12477)
Summary: Universal compaction currently uses `level0_file_num_compaction_trigger` for two purposes: 1. the trigger for checking if there is any compaction to do, and 2. the limit on the number of sorted runs. RocksDB will do compaction to keep the number of sorted runs no more than the value of this option. This can make the option inflexible. A value that is too small causes higher write amp: more compactions to reduce the number of sorted runs. A value that is too big delays potential compaction work and causes worse read performance. This PR introduce an option `CompactionOptionsUniversal::max_read_amp` for only the second purpose: to specify the hard limit on the number of sorted runs. For backward compatibility, `max_read_amp = -1` by default, which means to fallback to the current behavior. When `max_read_amp > 0`,`level0_file_num_compaction_trigger` will only serve as a trigger to find potential compaction. When `max_read_amp = 0`, RocksDB will auto-tune the limit on the number of sorted runs. The estimation is based on DB size, write_buffer_size and size_ratio, so it is adaptive to the size change of the DB. See more in `UniversalCompactionBuilder::PickCompaction()`. Alternatively, users now can configure `max_read_amp` to a very big value and keep `level0_file_num_compaction_trigger` small. This will allow `size_ratio` and `max_size_amplification_percent` to control the number of sorted runs. This essentially disables compactions with reason kUniversalSortedRunNum. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12477 Test Plan: * new unit test * existing unit test for default behavior * updated crash test with the new option * benchmark: * Create a DB that is roughly 24GB in the last level. When `max_read_amp = 0`, we estimate that the DB needs 9 levels to avoid excessive compactions to reduce the number of sorted runs. * We then run fillrandom to ingest another 24GB data to compare write amp. * case 1: small level0 trigger: `level0_file_num_compaction_trigger=5, max_read_amp=-1` * write-amp: 4.8 * case 2: auto-tune: `level0_file_num_compaction_trigger=5, max_read_amp=0` * write-amp: 3.6 * case 3: auto-tune with minimal trigger: `level0_file_num_compaction_trigger=1, max_read_amp=0` * write-amp: 3.8 * case 4: hard-code a good value for trigger: `level0_file_num_compaction_trigger=9` * write-amp: 2.8 ``` Case 1: ** Compaction Stats [default] ** Level Files Size Score Read(GB) Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop Rblob(GB) Wblob(GB) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ L0 0/0 0.00 KB 1.0 0.0 0.0 0.0 22.6 22.6 0.0 1.0 0.0 163.2 141.94 111.10 108 1.314 0 0 0.0 0.0 L45 8/0 1.81 GB 0.0 39.6 11.1 28.5 39.3 10.8 0.0 3.5 209.0 207.3 194.25 191.29 43 4.517 348M 2498K 0.0 0.0 L46 13/0 3.12 GB 0.0 15.3 9.5 5.8 15.0 9.3 0.0 1.6 203.1 199.3 77.13 75.88 16 4.821 134M 2362K 0.0 0.0 L47 19/0 4.68 GB 0.0 15.4 10.5 4.9 14.7 9.8 0.0 1.4 204.0 194.9 77.38 76.15 8 9.673 135M 5920K 0.0 0.0 L48 38/0 9.42 GB 0.0 19.6 11.7 7.9 17.3 9.4 0.0 1.5 206.5 182.3 97.15 95.02 4 24.287 172M 20M 0.0 0.0 L49 91/0 22.70 GB 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 0 0.000 0 0 0.0 0.0 Sum 169/0 41.74 GB 0.0 89.9 42.9 47.0 109.0 61.9 0.0 4.8 156.7 189.8 587.85 549.45 179 3.284 791M 31M 0.0 0.0 Case 2: ** Compaction Stats [default] ** Level Files Size Score Read(GB) Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop Rblob(GB) Wblob(GB) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ L0 1/0 214.47 MB 1.2 0.0 0.0 0.0 22.6 22.6 0.0 1.0 0.0 164.5 140.81 109.98 108 1.304 0 0 0.0 0.0 L44 0/0 0.00 KB 0.0 1.3 1.3 0.0 1.2 1.2 0.0 1.0 206.1 204.9 6.24 5.98 3 2.081 11M 51K 0.0 0.0 L45 4/0 844.36 MB 0.0 7.1 5.4 1.7 7.0 5.4 0.0 1.3 194.6 192.9 37.41 36.00 13 2.878 62M 489K 0.0 0.0 L46 11/0 2.57 GB 0.0 14.6 9.8 4.8 14.3 9.5 0.0 1.5 193.7 189.8 77.09 73.54 17 4.535 128M 2411K 0.0 0.0 L47 24/0 5.81 GB 0.0 19.8 12.0 7.8 18.8 11.0 0.0 1.6 191.4 181.1 106.19 101.21 9 11.799 174M 9166K 0.0 0.0 L48 38/0 9.42 GB 0.0 19.6 11.8 7.9 17.3 9.4 0.0 1.5 197.3 173.6 101.97 97.23 4 25.491 172M 20M 0.0 0.0 L49 91/0 22.70 GB 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 0 0.000 0 0 0.0 0.0 Sum 169/0 41.54 GB 0.0 62.4 40.3 22.1 81.3 59.2 0.0 3.6 136.1 177.2 469.71 423.94 154 3.050 549M 32M 0.0 0.0 Case 3: ** Compaction Stats [default] ** Level Files Size Score Read(GB) Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop Rblob(GB) Wblob(GB) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ L0 0/0 0.00 KB 5.0 0.0 0.0 0.0 22.6 22.6 0.0 1.0 0.0 163.8 141.43 111.13 108 1.310 0 0 0.0 0.0 L44 0/0 0.00 KB 0.0 0.8 0.8 0.0 0.8 0.8 0.0 1.0 201.4 200.2 4.26 4.19 2 2.130 7360K 33K 0.0 0.0 L45 4/0 844.38 MB 0.0 6.3 5.0 1.2 6.2 5.0 0.0 1.2 202.0 200.3 31.81 31.50 12 2.651 55M 403K 0.0 0.0 L46 7/0 1.62 GB 0.0 13.3 8.8 4.6 13.1 8.6 0.0 1.5 198.9 195.7 68.72 67.89 17 4.042 117M 1696K 0.0 0.0 L47 24/0 5.81 GB 0.0 21.7 12.9 8.8 20.6 11.8 0.0 1.6 198.5 188.6 112.04 109.97 12 9.336 191M 9352K 0.0 0.0 L48 41/0 10.14 GB 0.0 24.8 13.0 11.8 21.9 10.1 0.0 1.7 198.6 175.6 127.88 125.36 6 21.313 218M 25M 0.0 0.0 L49 91/0 22.70 GB 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 0 0.000 0 0 0.0 0.0 Sum 167/0 41.10 GB 0.0 67.0 40.5 26.4 85.4 58.9 0.0 3.8 141.1 179.8 486.13 450.04 157 3.096 589M 36M 0.0 0.0 Case 4: ** Compaction Stats [default] ** Level Files Size Score Read(GB) Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop Rblob(GB) Wblob(GB) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ L0 0/0 0.00 KB 0.7 0.0 0.0 0.0 22.6 22.6 0.0 1.0 0.0 158.6 146.02 114.68 108 1.352 0 0 0.0 0.0 L42 0/0 0.00 KB 0.0 1.7 1.7 0.0 1.7 1.7 0.0 1.0 185.4 184.3 9.25 8.96 4 2.314 14M 67K 0.0 0.0 L43 0/0 0.00 KB 0.0 2.5 2.5 0.0 2.5 2.5 0.0 1.0 197.8 195.6 13.01 12.65 4 3.253 22M 202K 0.0 0.0 L44 4/0 844.40 MB 0.0 4.2 4.2 0.0 4.1 4.1 0.0 1.0 188.1 185.1 22.81 21.89 5 4.562 36M 503K 0.0 0.0 L45 13/0 3.12 GB 0.0 7.5 6.5 1.0 7.2 6.2 0.0 1.1 188.7 181.8 40.69 39.32 5 8.138 65M 2282K 0.0 0.0 L46 17/0 4.18 GB 0.0 8.3 7.1 1.2 7.9 6.6 0.0 1.1 192.2 181.8 44.23 43.06 4 11.058 73M 3846K 0.0 0.0 L47 22/0 5.34 GB 0.0 8.9 7.5 1.4 8.2 6.8 0.0 1.1 189.1 174.1 48.12 45.37 3 16.041 78M 6098K 0.0 0.0 L48 27/0 6.58 GB 0.0 9.2 7.6 1.6 8.2 6.6 0.0 1.1 195.2 172.9 48.52 47.11 2 24.262 81M 9217K 0.0 0.0 L49 91/0 22.70 GB 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 0 0.000 0 0 0.0 0.0 Sum 174/0 42.74 GB 0.0 42.3 37.0 5.3 62.4 57.1 0.0 2.8 116.3 171.3 372.66 333.04 135 2.760 372M 22M 0.0 0.0 setup: ./db_bench --benchmarks=fillseq,compactall,waitforcompaction --num=200000000 --compression_type=none --disable_wal=1 --compaction_style=1 --num_levels=50 --target_file_size_base=268435456 --max_compaction_bytes=6710886400 --level0_file_num_compaction_trigger=10 --write_buffer_size=268435456 --seed 1708494134896523 benchmark: ./db_bench --benchmarks=overwrite,waitforcompaction,stats --num=200000000 --compression_type=none --disable_wal=1 --compaction_style=1 --write_buffer_size=268435456 --level0_file_num_compaction_trigger=5 --target_file_size_base=268435456 --use_existing_db=1 --num_levels=50 --writes=200000000 --universal_max_read_amp=-1 --seed=1716488324800233 ``` Reviewed By: ajkr Differential Revision: D55370922 Pulled By: cbi42 fbshipit-source-id: 9be69979126b840d08e93e7059260e76a878bb2a |
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Hui Xiao
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d7b938882e |
Sync WAL during db Close() (#12556)
Summary: **Context/Summary:** Below crash test found out we don't sync WAL upon DB close, which can lead to unsynced data loss. This PR syncs it. ``` ./db_stress --threads=1 --disable_auto_compactions=1 --WAL_size_limit_MB=0 --WAL_ttl_seconds=0 --acquire_snapshot_one_in=0 --adaptive_readahead=0 --adm_policy=1 --advise_random_on_open=1 --allow_concurrent_memtable_write=1 --allow_data_in_errors=True --allow_fallocate=0 --async_io=0 --auto_readahead_size=0 --avoid_flush_during_recovery=1 --avoid_flush_during_shutdown=0 --avoid_unnecessary_blocking_io=1 --backup_max_size=104857600 --backup_one_in=0 --batch_protection_bytes_per_key=0 --bgerror_resume_retry_interval=1000000 --block_align=0 --block_protection_bytes_per_key=2 --block_size=16384 --bloom_before_level=1 --bloom_bits=29.895303579352174 --bottommost_compression_type=disable --bottommost_file_compaction_delay=0 --bytes_per_sync=0 --cache_index_and_filter_blocks=0 --cache_index_and_filter_blocks_with_high_priority=1 --cache_size=33554432 --cache_type=lru_cache --charge_compression_dictionary_building_buffer=1 --charge_file_metadata=0 --charge_filter_construction=1 --charge_table_reader=1 --checkpoint_one_in=0 --checksum_type=kxxHash64 --clear_column_family_one_in=0 --column_families=1 --compact_files_one_in=0 --compact_range_one_in=0 --compaction_pri=0 --compaction_readahead_size=0 --compaction_style=0 --compaction_ttl=0 --compress_format_version=2 --compressed_secondary_cache_ratio=0 --compressed_secondary_cache_size=0 --compression_checksum=1 --compression_max_dict_buffer_bytes=0 --compression_max_dict_bytes=0 --compression_parallel_threads=4 --compression_type=zstd --compression_use_zstd_dict_trainer=1 --compression_zstd_max_train_bytes=0 --continuous_verification_interval=0 --data_block_index_type=0 --db=/dev/shm/rocksdb_test/rocksdb_crashtest_whitebox --db_write_buffer_size=0 --default_temperature=kUnknown --default_write_temperature=kUnknown --delete_obsolete_files_period_micros=0 --delpercent=0 --delrangepercent=0 --destroy_db_initially=1 --detect_filter_construct_corruption=1 --disable_wal=0 --dump_malloc_stats=0 --enable_checksum_handoff=0 --enable_compaction_filter=0 --enable_custom_split_merge=0 --enable_do_not_compress_roles=1 --enable_index_compression=1 --enable_memtable_insert_with_hint_prefix_extractor=0 --enable_pipelined_write=0 --enable_sst_partitioner_factory=0 --enable_thread_tracking=1 --enable_write_thread_adaptive_yield=0 --expected_values_dir=/dev/shm/rocksdb_test/rocksdb_crashtest_expected --fail_if_options_file_error=0 --fifo_allow_compaction=1 --file_checksum_impl=none --fill_cache=0 --flush_one_in=1000 --format_version=5 --get_current_wal_file_one_in=0 --get_live_files_one_in=0 --get_property_one_in=0 --get_sorted_wal_files_one_in=0 --hard_pending_compaction_bytes_limit=274877906944 --high_pri_pool_ratio=0 --index_block_restart_interval=6 --index_shortening=0 --index_type=0 --ingest_external_file_one_in=0 --initial_auto_readahead_size=16384 --iterpercent=0 --key_len_percent_dist=1,30,69 --last_level_temperature=kUnknown --level_compaction_dynamic_level_bytes=1 --lock_wal_one_in=0 --log2_keys_per_lock=10 --log_file_time_to_roll=0 --log_readahead_size=16777216 --long_running_snapshots=0 --low_pri_pool_ratio=0 --lowest_used_cache_tier=0 --manifest_preallocation_size=5120 --manual_wal_flush_one_in=0 --mark_for_compaction_one_file_in=0 --max_auto_readahead_size=0 --max_background_compactions=1 --max_bytes_for_level_base=67108864 --max_key=2500000 --max_key_len=3 --max_log_file_size=0 --max_manifest_file_size=1073741824 --max_sequential_skip_in_iterations=8 --max_total_wal_size=0 --max_write_batch_group_size_bytes=64 --max_write_buffer_number=10 --max_write_buffer_size_to_maintain=0 --memtable_insert_hint_per_batch=0 --memtable_max_range_deletions=0 --memtable_prefix_bloom_size_ratio=0.5 --memtable_protection_bytes_per_key=1 --memtable_whole_key_filtering=1 --memtablerep=skip_list --metadata_charge_policy=0 --min_write_buffer_number_to_merge=1 --mmap_read=0 --mock_direct_io=True --nooverwritepercent=1 --num_file_reads_for_auto_readahead=0 --num_levels=1 --open_files=-1 --open_metadata_write_fault_one_in=0 --open_read_fault_one_in=0 --open_write_fault_one_in=0 --ops_per_thread=3 --optimize_filters_for_hits=1 --optimize_filters_for_memory=1 --optimize_multiget_for_io=0 --paranoid_file_checks=0 --partition_filters=0 --partition_pinning=1 --pause_background_one_in=0 --periodic_compaction_seconds=0 --prefix_size=1 --prefixpercent=0 --prepopulate_block_cache=0 --preserve_internal_time_seconds=3600 --progress_reports=0 --read_amp_bytes_per_bit=0 --read_fault_one_in=0 --readahead_size=16384 --readpercent=0 --recycle_log_file_num=0 --reopen=2 --report_bg_io_stats=1 --sample_for_compression=5 --secondary_cache_fault_one_in=0 --secondary_cache_uri= --skip_stats_update_on_db_open=1 --snapshot_hold_ops=0 --soft_pending_compaction_bytes_limit=68719476736 --sst_file_manager_bytes_per_sec=0 --sst_file_manager_bytes_per_truncate=0 --stats_dump_period_sec=10 --stats_history_buffer_size=1048576 --strict_bytes_per_sync=0 --subcompactions=3 --sync=0 --sync_fault_injection=1 --table_cache_numshardbits=6 --target_file_size_base=16777216 --target_file_size_multiplier=1 --test_batches_snapshots=0 --top_level_index_pinning=0 --unpartitioned_pinning=3 --use_adaptive_mutex=1 --use_adaptive_mutex_lru=0 --use_delta_encoding=1 --use_direct_io_for_flush_and_compaction=0 --use_direct_reads=0 --use_full_merge_v1=0 --use_get_entity=0 --use_merge=0 --use_multi_get_entity=0 --use_multiget=1 --use_put_entity_one_in=0 --use_write_buffer_manager=0 --user_timestamp_size=0 --value_size_mult=32 --verification_only=0 --verify_checksum=1 --verify_checksum_one_in=1000 --verify_compression=0 --verify_db_one_in=100000 --verify_file_checksums_one_in=0 --verify_iterator_with_expected_state_one_in=5 --verify_sst_unique_id_in_manifest=1 --wal_bytes_per_sync=0 --wal_compression=zstd --write_buffer_size=33554432 --write_dbid_to_manifest=0 --write_fault_one_in=0 --writepercent=100 Verification failed for column family 0 key 000000000000B9D1000000000000012B000000000000017D (4756691): value_from_db: , value_from_expected: 010000000504070609080B0A0D0C0F0E111013121514171619181B1A1D1C1F1E212023222524272629282B2A2D2C2F2E313033323534373639383B3A3D3C3F3E, msg: Iterator verification: Value not found: NotFound: Verification failed :( ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/12556 Test Plan: - New UT - Same stress test command failed before this fix but pass after - CI Reviewed By: ajkr Differential Revision: D56267964 Pulled By: hx235 fbshipit-source-id: af1b7e8769c129f64ba1c7f1ff17102f1239b929 |
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anand76
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d8fb849b7e |
Basic RocksDB follower implementation (#12540)
Summary: A basic implementation of RocksDB follower mode, which opens a remote database (referred to as leader) on a distributed file system by tailing its MANIFEST. It leverages the secondary instance mode, but is different in some key ways - 1. It has its own directory with links to the leader's database 2. Periodically refreshes itself 3. (Future) Snapshot support 4. (Future) Garbage collection of obsolete links 5. (Long term) Memtable replication There are two main classes implementing this functionality - `DBImplFollower` and `OnDemandFileSystem`. The former is derived from `DBImplSecondary`. Similar to `DBImplSecondary`, it implements recovery and catch up through MANIFEST tailing using the `ReactiveVersionSet`, but does not consider logs. In a future PR, we will implement memtable replication, which will eliminate the need to catch up using logs. In addition, the recovery and catch-up tries to avoid directory listing as repeated metadata operations are expensive. The second main piece is the `OnDemandFileSystem`, which plugs in as an `Env` for the follower instance and creates the illusion of the follower directory as a clone of the leader directory. It creates links to SSTs on first reference. When the follower tails the MANIFEST and attempts to create a new `Version`, it calls `VerifyFileMetadata` to verify the size of the file, and optionally the unique ID of the file. During this process, links are created which prevent the underlying files from getting deallocated even if the leader deletes the files. TODOs: Deletion of obsolete links, snapshots, robust checking against misconfigurations, better observability etc. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12540 Reviewed By: jowlyzhang Differential Revision: D56315718 Pulled By: anand1976 fbshipit-source-id: d19e1aca43a6af4000cb8622a718031b69ebd97b |
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Hui Xiao
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ad423abbd1 |
Add more missing options in crash test (#12508)
Summary: **Context/Summary:** This is to improve our crash test coverage. Bonus change: - Added the missing Options string mapping for `CacheTier::kVolatileCompressedTier` - Deprecated crash test options `enable_tiered_storage` mainly for setting `last_level_temperature` which is now covered in crash test by itself - Intensified `verify_checksum_one_in\verify_file_checksums_one_in` as I found out these together with new coverage surface more issues Pull Request resolved: https://github.com/facebook/rocksdb/pull/12508 Test Plan: CI to look out for trivial failures Reviewed By: jowlyzhang Differential Revision: D55768594 Pulled By: hx235 fbshipit-source-id: 9b829da0309a7db3fcdb17992a524dd64498325c |
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yuzhangyu@fb.com
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1cfdece85d |
Run internal cpp modernizer on RocksDB repo (#12398)
Summary: When internal cpp modernizer attempts to format rocksdb code, it will replace macro `ROCKSDB_NAMESPACE` with its default definition `rocksdb` when collapsing nested namespace. We filed a feedback for the tool T180254030 and the team filed a bug for this: https://github.com/llvm/llvm-project/issues/83452. At the same time, they suggested us to run the modernizer tool ourselves so future auto codemod attempts will be smaller. This diff contains: Running `xplat/scripts/codemod_service/cpp_modernizer.sh` in fbcode/internal_repo_rocksdb/repo (excluding some directories in utilities/transactions/lock/range/range_tree/lib that has a non meta copyright comment) without swapping out the namespace macro `ROCKSDB_NAMESPACE` Followed by RocksDB's own `make format` Pull Request resolved: https://github.com/facebook/rocksdb/pull/12398 Test Plan: Auto tests Reviewed By: hx235 Differential Revision: D54382532 Pulled By: jowlyzhang fbshipit-source-id: e7d5b40f9b113b60e5a503558c181f080b9d02fa |
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Peter Dillinger
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13ef21c22e |
default_write_temperature option (#12388)
Summary: Currently SST files that aren't applicable to last_level_temperature nor file_temperature_age_thresholds are written with temperature kUnknown, which is a little weird and doesn't support CF-based tiering. The default_temperature option only affects how kUnknown is interpreted for stats. This change adds a new per-CF option default_write_temperature that determines the temperature of new SST files when those other options do not apply. Also made a change to ignore last_level_temperature with FIFO compaction, because I found that could lead to an infinite loop in compaction. Needed follow-up: Fix temperature handling with external file ingestion Pull Request resolved: https://github.com/facebook/rocksdb/pull/12388 Test Plan: unit tests extended appropriately. (Ignore whitespace changes when reviewing.) Reviewed By: jowlyzhang Differential Revision: D54266574 Pulled By: pdillinger fbshipit-source-id: c9ec9a74dbf22be6e986f77f9689d05fea8ef0bb |
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Peter Dillinger
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d780e7a561 |
Remove `bottommost_temperature` (#12389)
Summary: deprecated option already replaced by `last_level_temperature`. (Keeping recognition of the option in old options files.) Pull Request resolved: https://github.com/facebook/rocksdb/pull/12389 Test Plan: tests updated Reviewed By: jowlyzhang, cbi42 Differential Revision: D54267946 Pulled By: pdillinger fbshipit-source-id: 65c49b15e7394829c1f3b44edd4179d2daff6017 |
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Yu Zhang
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2940acac00 |
Persist table options use_delta_encoding in options file (#11987)
Summary:
This option is used for encoding keys in block based table files. It has been having a default true value since its introduction.
Users may not notice this option is not persisted in options file unless they are explicitly setting it to false. If the users expect `Iterator::GetProperty("rocksdb.iterator.is-key-pinned")` to return 1 when setting `ReadOptions.pin_data = true`, they should have noticed loading options file won't work and have work around for this by always explicitly set this option to false for opening DB. This change won't impact those users except that now they can remove their work around. If the users are not relying on key pinning behavior at all and as a result didn't notice the option is not persisted, this change shouldn't have any visible behavior impact either.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/11987
Reviewed By: hx235
Differential Revision: D54093238
Pulled By: jowlyzhang
fbshipit-source-id: 256a3348c44cf91349034d1f6e242c437b32b9a5
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Andrew Kryczka
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8e29f243c9 |
No filesystem reads during `Merge()` writes (#12365)
Summary: This occasional filesystem read in the write path has caused user pain. It doesn't seem very useful considering it only limits one component's merge chain length, and only helps merge uncached (i.e., infrequently read) values. This PR proposes allowing `max_successive_merges` to be exceeded when the value cannot be read from in-memory components. I included a rollback flag (`strict_max_successive_merges`) just in case. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12365 Test Plan: "rocksdb.block.cache.data.add" is number of data blocks read from filesystem. Since the benchmark is write-only, compaction is disabled, and flush doesn't read data blocks, any nonzero value means the user write issued the read. ``` $ for s in false true; do echo -n "strict_max_successive_merges=$s: " && ./db_bench -value_size=64 -write_buffer_size=131072 -writes=128 -num=1 -benchmarks=mergerandom,flush,mergerandom -merge_operator=stringappend -disable_auto_compactions=true -compression_type=none -strict_max_successive_merges=$s -max_successive_merges=100 -statistics=true |& grep 'block.cache.data.add COUNT' ; done strict_max_successive_merges=false: rocksdb.block.cache.data.add COUNT : 0 strict_max_successive_merges=true: rocksdb.block.cache.data.add COUNT : 1 ``` Reviewed By: hx235 Differential Revision: D53982520 Pulled By: ajkr fbshipit-source-id: e40f761a60bd601f232417ac0058e4a33ee9c0f4 |
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Yaroslav Stepanchuk
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395d24f0fa |
Fix build on alpine 3.19 (#12345)
Summary: Add missing include of the cstdint header. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12345 Reviewed By: ltamasi Differential Revision: D53672261 Pulled By: cbi42 fbshipit-source-id: 758944c0b51b9701a129e7b88f692103bbce11d3 |
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Peter Dillinger
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54cb9c77d9 |
Prefer static_cast in place of most reinterpret_cast (#12308)
Summary: The following are risks associated with pointer-to-pointer reinterpret_cast: * Can produce the "wrong result" (crash or memory corruption). IIRC, in theory this can happen for any up-cast or down-cast for a non-standard-layout type, though in practice would only happen for multiple inheritance cases (where the base class pointer might be "inside" the derived object). We don't use multiple inheritance a lot, but we do. * Can mask useful compiler errors upon code change, including converting between unrelated pointer types that you are expecting to be related, and converting between pointer and scalar types unintentionally. I can only think of some obscure cases where static_cast could be troublesome when it compiles as a replacement: * Going through `void*` could plausibly cause unnecessary or broken pointer arithmetic. Suppose we have `struct Derived: public Base1, public Base2`. If we have `Derived*` -> `void*` -> `Base2*` -> `Derived*` through reinterpret casts, this could plausibly work (though technical UB) assuming the `Base2*` is not dereferenced. Changing to static cast could introduce breaking pointer arithmetic. * Unnecessary (but safe) pointer arithmetic could arise in a case like `Derived*` -> `Base2*` -> `Derived*` where before the Base2 pointer might not have been dereferenced. This could potentially affect performance. With some light scripting, I tried replacing pointer-to-pointer reinterpret_casts with static_cast and kept the cases that still compile. Most occurrences of reinterpret_cast have successfully been changed (except for java/ and third-party/). 294 changed, 257 remain. A couple of related interventions included here: * Previously Cache::Handle was not actually derived from in the implementations and just used as a `void*` stand-in with reinterpret_cast. Now there is a relationship to allow static_cast. In theory, this could introduce pointer arithmetic (as described above) but is unlikely without multiple inheritance AND non-empty Cache::Handle. * Remove some unnecessary casts to void* as this is allowed to be implicit (for better or worse). Most of the remaining reinterpret_casts are for converting to/from raw bytes of objects. We could consider better idioms for these patterns in follow-up work. I wish there were a way to implement a template variant of static_cast that would only compile if no pointer arithmetic is generated, but best I can tell, this is not possible. AFAIK the best you could do is a dynamic check that the void* conversion after the static cast is unchanged. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12308 Test Plan: existing tests, CI Reviewed By: ltamasi Differential Revision: D53204947 Pulled By: pdillinger fbshipit-source-id: 9de23e618263b0d5b9820f4e15966876888a16e2 |
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Hui Xiao
|
1a885fe730 |
Remove deprecated Options::access_hint_on_compaction_start (#11654)
Summary:
**Context:**
`Options::access_hint_on_compaction_start ` is marked deprecated and now ready to be removed.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/11654
Test Plan:
Multiple db_stress runs with pre-PR and post-PR binary randomly to ensure forward/backward compatibility on options
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Changyu Bi
|
5620efc794 |
Remove deprecated option `ignore_max_compaction_bytes_for_input` (#12323)
Summary: The option is introduced in https://github.com/facebook/rocksdb/issues/10835 to allow disabling the new compaction behavior if it's not safe. The option is enabled by default and there has not been a need to disable it. So it should be safe to remove now. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12323 Reviewed By: ajkr Differential Revision: D53330336 Pulled By: cbi42 fbshipit-source-id: 36eef4664ac96b3a7ed627c48bd6610b0a7eafc5 |
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Changyu Bi
|
ace1721b28 |
Remove deprecated option `level_compaction_dynamic_file_size` (#12325)
Summary: The option is introduced in https://github.com/facebook/rocksdb/issues/10655 to allow reverting to old behavior. The option is enabled by default and there has not been a need to disable it. Remove it for 9.0 release. Also fixed and improved a few unit tests that depended on setting this option to false. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12325 Test Plan: existing tests. Reviewed By: hx235 Differential Revision: D53369430 Pulled By: cbi42 fbshipit-source-id: 0ec2440ca8d88db7f7211c581542c7581bd4d3de |
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Andrew Kryczka
|
f9d45358ca |
Removed `check_flush_compaction_key_order` (#12311)
Summary: `check_flush_compaction_key_order` option was introduced for the key order checking online validation. It gave users the ability to disable the validation without downgrade in case the validation caused inefficiencies or false positives. Over time this validation has shown to be cheap and correct, so the option to disable it can now be removed. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12311 Reviewed By: cbi42 Differential Revision: D53233379 Pulled By: ajkr fbshipit-source-id: 1384361104021d6e3e580dce2ec123f9f99ce637 |
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Peter Dillinger
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76c834e441 |
Remove 'virtual' when implied by 'override' (#12319)
Summary:
... to follow modern C++ style / idioms.
Used this hack:
```
for FILE in `cat my_list_of_files`; do perl -pi -e 'BEGIN{undef $/;} s/ virtual( [^;{]* override)/$1/smg' $FILE; done
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12319
Test Plan: existing tests, CI
Reviewed By: jaykorean
Differential Revision: D53275303
Pulled By: pdillinger
fbshipit-source-id: bc0881af270aa8ef4d0ae4f44c5a6614b6407377
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Peter Dillinger
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4e60663b31 |
Remove unnecessary, confusing 'extern' (#12300)
Summary: In C++, `extern` is redundant in a number of cases: * "Global" function declarations and definitions * "Global" variable definitions when already declared `extern` For consistency and simplicity, I've removed these in code that *we own*. In a couple of cases, I removed obsolete declarations, and for MagicNumber constants, I have consolidated the declarations into a header file (format.h) as standard best practice would prescribe. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12300 Test Plan: no functional changes, CI Reviewed By: ajkr Differential Revision: D53148629 Pulled By: pdillinger fbshipit-source-id: fb8d927959892e03af09b0c0d542b0a3b38fd886 |
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Hui Xiao
|
06e593376c |
Group SST write in flush, compaction and db open with new stats (#11910)
Summary: ## Context/Summary Similar to https://github.com/facebook/rocksdb/pull/11288, https://github.com/facebook/rocksdb/pull/11444, categorizing SST/blob file write according to different io activities allows more insight into the activity. For that, this PR does the following: - Tag different write IOs by passing down and converting WriteOptions to IOOptions - Add new SST_WRITE_MICROS histogram in WritableFileWriter::Append() and breakdown FILE_WRITE_{FLUSH|COMPACTION|DB_OPEN}_MICROS Some related code refactory to make implementation cleaner: - Blob stats - Replace high-level write measurement with low-level WritableFileWriter::Append() measurement for BLOB_DB_BLOB_FILE_WRITE_MICROS. This is to make FILE_WRITE_{FLUSH|COMPACTION|DB_OPEN}_MICROS include blob file. As a consequence, this introduces some behavioral changes on it, see HISTORY and db bench test plan below for more info. - Fix bugs where BLOB_DB_BLOB_FILE_SYNCED/BLOB_DB_BLOB_FILE_BYTES_WRITTEN include file failed to sync and bytes failed to write. - Refactor WriteOptions constructor for easier construction with io_activity and rate_limiter_priority - Refactor DBImpl::~DBImpl()/BlobDBImpl::Close() to bypass thread op verification - Build table - TableBuilderOptions now includes Read/WriteOpitons so BuildTable() do not need to take these two variables - Replace the io_priority passed into BuildTable() with TableBuilderOptions::WriteOpitons::rate_limiter_priority. Similar for BlobFileBuilder. This parameter is used for dynamically changing file io priority for flush, see https://github.com/facebook/rocksdb/pull/9988?fbclid=IwAR1DtKel6c-bRJAdesGo0jsbztRtciByNlvokbxkV6h_L-AE9MACzqRTT5s for more - Update ThreadStatus::FLUSH_BYTES_WRITTEN to use io_activity to track flush IO in flush job and db open instead of io_priority ## Test ### db bench Flush ``` ./db_bench --statistics=1 --benchmarks=fillseq --num=100000 --write_buffer_size=100 rocksdb.sst.write.micros P50 : 1.830863 P95 : 4.094720 P99 : 6.578947 P100 : 26.000000 COUNT : 7875 SUM : 20377 rocksdb.file.write.flush.micros P50 : 1.830863 P95 : 4.094720 P99 : 6.578947 P100 : 26.000000 COUNT : 7875 SUM : 20377 rocksdb.file.write.compaction.micros P50 : 0.000000 P95 : 0.000000 P99 : 0.000000 P100 : 0.000000 COUNT : 0 SUM : 0 rocksdb.file.write.db.open.micros P50 : 0.000000 P95 : 0.000000 P99 : 0.000000 P100 : 0.000000 COUNT : 0 SUM : 0 ``` compaction, db oopen ``` Setup: ./db_bench --statistics=1 --benchmarks=fillseq --num=10000 --disable_auto_compactions=1 -write_buffer_size=100 --db=../db_bench Run:./db_bench --statistics=1 --benchmarks=compact --db=../db_bench --use_existing_db=1 rocksdb.sst.write.micros P50 : 2.675325 P95 : 9.578788 P99 : 18.780000 P100 : 314.000000 COUNT : 638 SUM : 3279 rocksdb.file.write.flush.micros P50 : 0.000000 P95 : 0.000000 P99 : 0.000000 P100 : 0.000000 COUNT : 0 SUM : 0 rocksdb.file.write.compaction.micros P50 : 2.757353 P95 : 9.610687 P99 : 19.316667 P100 : 314.000000 COUNT : 615 SUM : 3213 rocksdb.file.write.db.open.micros P50 : 2.055556 P95 : 3.925000 P99 : 9.000000 P100 : 9.000000 COUNT : 23 SUM : 66 ``` blob stats - just to make sure they aren't broken by this PR ``` Integrated Blob DB Setup: ./db_bench --enable_blob_files=1 --statistics=1 --benchmarks=fillseq --num=10000 --disable_auto_compactions=1 -write_buffer_size=100 --db=../db_bench Run:./db_bench --enable_blob_files=1 --statistics=1 --benchmarks=compact --db=../db_bench --use_existing_db=1 pre-PR: rocksdb.blobdb.blob.file.write.micros P50 : 7.298246 P95 : 9.771930 P99 : 9.991813 P100 : 16.000000 COUNT : 235 SUM : 1600 rocksdb.blobdb.blob.file.synced COUNT : 1 rocksdb.blobdb.blob.file.bytes.written COUNT : 34842 post-PR: rocksdb.blobdb.blob.file.write.micros P50 : 2.000000 P95 : 2.829360 P99 : 2.993779 P100 : 9.000000 COUNT : 707 SUM : 1614 - COUNT is higher and values are smaller as it includes header and footer write - COUNT is 3X higher due to each Append() count as one post-PR, while in pre-PR, 3 Append()s counts as one. See https://github.com/facebook/rocksdb/pull/11910/files#diff-32b811c0a1c000768cfb2532052b44dc0b3bf82253f3eab078e15ff201a0dabfL157-L164 rocksdb.blobdb.blob.file.synced COUNT : 1 (stay the same) rocksdb.blobdb.blob.file.bytes.written COUNT : 34842 (stay the same) ``` ``` Stacked Blob DB Run: ./db_bench --use_blob_db=1 --statistics=1 --benchmarks=fillseq --num=10000 --disable_auto_compactions=1 -write_buffer_size=100 --db=../db_bench pre-PR: rocksdb.blobdb.blob.file.write.micros P50 : 12.808042 P95 : 19.674497 P99 : 28.539683 P100 : 51.000000 COUNT : 10000 SUM : 140876 rocksdb.blobdb.blob.file.synced COUNT : 8 rocksdb.blobdb.blob.file.bytes.written COUNT : 1043445 post-PR: rocksdb.blobdb.blob.file.write.micros P50 : 1.657370 P95 : 2.952175 P99 : 3.877519 P100 : 24.000000 COUNT : 30001 SUM : 67924 - COUNT is higher and values are smaller as it includes header and footer write - COUNT is 3X higher due to each Append() count as one post-PR, while in pre-PR, 3 Append()s counts as one. See https://github.com/facebook/rocksdb/pull/11910/files#diff-32b811c0a1c000768cfb2532052b44dc0b3bf82253f3eab078e15ff201a0dabfL157-L164 rocksdb.blobdb.blob.file.synced COUNT : 8 (stay the same) rocksdb.blobdb.blob.file.bytes.written COUNT : 1043445 (stay the same) ``` ### Rehearsal CI stress test Trigger 3 full runs of all our CI stress tests ### Performance Flush ``` TEST_TMPDIR=/dev/shm ./db_basic_bench_pre_pr --benchmark_filter=ManualFlush/key_num:524288/per_key_size:256 --benchmark_repetitions=1000 -- default: 1 thread is used to run benchmark; enable_statistics = true Pre-pr: avg 507515519.3 ns 497686074,499444327,500862543,501389862,502994471,503744435,504142123,504224056,505724198,506610393,506837742,506955122,507695561,507929036,508307733,508312691,508999120,509963561,510142147,510698091,510743096,510769317,510957074,511053311,511371367,511409911,511432960,511642385,511691964,511730908, Post-pr: avg 511971266.5 ns, regressed 0.88% 502744835,506502498,507735420,507929724,508313335,509548582,509994942,510107257,510715603,511046955,511352639,511458478,512117521,512317380,512766303,512972652,513059586,513804934,513808980,514059409,514187369,514389494,514447762,514616464,514622882,514641763,514666265,514716377,514990179,515502408, ``` Compaction ``` TEST_TMPDIR=/dev/shm ./db_basic_bench_{pre|post}_pr --benchmark_filter=ManualCompaction/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:1 --benchmark_repetitions=1000 -- default: 1 thread is used to run benchmark Pre-pr: avg 495346098.30 ns 492118301,493203526,494201411,494336607,495269217,495404950,496402598,497012157,497358370,498153846 Post-pr: avg 504528077.20, regressed 1.85%. "ManualCompaction" include flush so the isolated regression for compaction should be around 1.85-0.88 = 0.97% 502465338,502485945,502541789,502909283,503438601,504143885,506113087,506629423,507160414,507393007 ``` Put with WAL (in case passing WriteOptions slows down this path even without collecting SST write stats) ``` TEST_TMPDIR=/dev/shm ./db_basic_bench_pre_pr --benchmark_filter=DBPut/comp_style:0/max_data:107374182400/per_key_size:256/enable_statistics:1/wal:1 --benchmark_repetitions=1000 -- default: 1 thread is used to run benchmark Pre-pr: avg 3848.10 ns 3814,3838,3839,3848,3854,3854,3854,3860,3860,3860 Post-pr: avg 3874.20 ns, regressed 0.68% 3863,3867,3871,3874,3875,3877,3877,3877,3880,3881 ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/11910 Reviewed By: ajkr Differential Revision: D49788060 Pulled By: hx235 fbshipit-source-id: 79e73699cda5be3b66461687e5147c2484fc5eff |
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anand76
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cc069f25b3 |
Add some compressed and tiered secondary cache stats (#12150)
Summary: Add statistics for more visibility. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12150 Reviewed By: akankshamahajan15 Differential Revision: D52184633 Pulled By: anand1976 fbshipit-source-id: 9969e05d65223811cd12627102b020bb6d229352 |
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Andrew Kryczka
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be3bc36811 |
internal_repo_rocksdb (-8794174668376270091) (#12114)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/12114 Reviewed By: jowlyzhang Differential Revision: D51745613 Pulled By: ajkr fbshipit-source-id: 27ca4bda275cab057d3a3ec99f0f92cdb9be5177 |
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Jay Huh
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2dab137182 |
Mark more files for periodic compaction during offpeak (#12031)
Summary: - The struct previously named `OffpeakTimeInfo` has been renamed to `OffpeakTimeOption` to indicate that it's a user-configurable option. Additionally, a new struct, `OffpeakTimeInfo`, has been introduced, which includes two fields: `is_now_offpeak` and `seconds_till_next_offpeak_start`. This change prevents the need to parse the `daily_offpeak_time_utc` string twice. - It's worth noting that we may consider adding more fields to the `OffpeakTimeInfo` struct, such as `elapsed_seconds` and `total_seconds`, as needed for further optimization. - Within `VersionStorageInfo::ComputeFilesMarkedForPeriodicCompaction()`, we've adjusted the `allowed_time_limit` to include files that are expected to expire by the next offpeak start. - We might explore further optimizations, such as evenly distributing files to mark during offpeak hours, if the initial approach results in marking too many files simultaneously during the first scoring in offpeak hours. The primary objective of this PR is to prevent periodic compactions during non-offpeak hours when offpeak hours are configured. We'll start with this straightforward solution and assess whether it suffices for now. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12031 Test Plan: Unit Tests added - `DBCompactionTest::LevelPeriodicCompactionOffpeak` for Leveled - `DBTestUniversalCompaction2::PeriodicCompaction` for Universal Reviewed By: cbi42 Differential Revision: D50900292 Pulled By: jaykorean fbshipit-source-id: 267e7d3332d45a5d9881796786c8650fa0a3b43d |
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Yu Zhang
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a42910537d |
Save the correct user comparator name in OPTIONS file (#12037)
Summary: I noticed the user comparator name in OPTIONS file can be incorrect when working on a recent stress test failure. The name of the comparator retrieved via the "Comparator::GetRootComparator" API is saved in OPTIONS file as the user comparator. The intention was to get the user comparator wrapped in the internal comparator. However `ImmutableCFOptions.user_comparator` has always been a user comparator of type `Comparator`. The corresponding `GetRootComparator` API is also defined only for user comparator type `Comparator`, not the internal key comparator type `InternalKeyComparator`. For built in comparator `BytewiseComparator` and `ReverseBytewiseComparator`, there is no difference between `Comparator::Name` and `Comparator::GetRootComparator::Name` because these built in comparators' root comparator is themselves. However, for built in comparator `BytewiseComparatorWithU64Ts` and `ReverseBytewiseComparatorWithU64Ts`, there are differences. So this change update the logic to persist the user comparator's name, not its root comparator's name. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12037 Test Plan: The restore flow in stress test, which relies on converting Options object to string and back to Options object is updated to help validate comparator object can be correctly serialized and deserialized with the OPTIONS file mechanism Updated unit test to use a comparator that has a root comparator that is not itself. Reviewed By: cbi42 Differential Revision: D50909750 Pulled By: jowlyzhang fbshipit-source-id: 9086d7135c7a6f4b5565fb47fce194ea0a024f52 |
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Jay Huh
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e230e4d248 |
Make OffpeakTimeInfo available in VersionSet (#12018)
Summary: As mentioned in https://github.com/facebook/rocksdb/issues/11893, we are going to use the offpeak time information to pre-process TTL-based compactions. To do so, we need to access `daily_offpeak_time_utc` in `VersionStorageInfo::ComputeCompactionScore()` where we pick the files to compact. This PR is to make the offpeak time information available at the time of compaction-scoring. We are not changing any compaction scoring logic just yet. Will follow up in a separate PR. There were two ways to achieve what we want. 1. Make `MutableDBOptions` available in `ColumnFamilyData` and `ComputeCompactionScore()` take `MutableDBOptions` along with `ImmutableOptions` and `MutableCFOptions`. 2. Make `daily_offpeak_time_utc` and `IsNowOffpeak()` available in `VersionStorageInfo`. We chose the latter as it involves smaller changes. This change includes the following - Introduction of `OffpeakTimeInfo` and `IsNowOffpeak()` has been moved from `MutableDBOptions` - `OffpeakTimeInfo` added to `VersionSet` and it can be set during construction and by `ChangeOffpeakTimeInfo()` - During `SetDBOptions()`, if offpeak time info needs to change, it calls `MaybeScheduleFlushOrCompaction()` to re-compute compaction scores and process compactions as needed Pull Request resolved: https://github.com/facebook/rocksdb/pull/12018 Test Plan: - `DBOptionsTest::OffpeakTimes` changed to include checks for `MaybeScheduleFlushOrCompaction()` calls and `VersionSet`'s OffpeakTimeInfo value change during `SetDBOptions()`. - `VersionSetTest::OffpeakTimeInfoTest` added to test `ChangeOffpeakTimeInfo()`. `IsNowOffpeak()` tests moved from `DBOptionsTest::OffpeakTimes` Reviewed By: pdillinger Differential Revision: D50723881 Pulled By: jaykorean fbshipit-source-id: 3cff0291936f3729c0e9c7750834b9378fb435f6 |
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Jay Huh
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5fbea87859 |
Disallow start_time == end_time in offpeak time and compare at minute level to allow 24hr offpeak (#11911)
Summary: Since allowing 24hr peak by setting start_time = end_time is not so intuitive, we are not going to allow it (e.g. `00:00-00:00` doesn't looks like a value that would cover 24hr.). Instead, we are going to compare at minute level (i.e. dropping the seconds to the nearest minute) so that `00:00-23:59` will cover 24hrs. The entire minute from 23:59:00 23:59:59 will be covered with this change. Minor fixes from previous PR - release build error - fixed random seed in test Pull Request resolved: https://github.com/facebook/rocksdb/pull/11911 Test Plan: `DBOptionsTest::OffPeakTimes` `make -j64 static_lib` to test release build issue that was fixed Reviewed By: pdillinger Differential Revision: D49787795 Pulled By: jaykorean fbshipit-source-id: e8d045b95f54f61d5dd5f1bb473579f8d55c18b3 |
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Jay Huh
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63ed868840 |
Offpeak in db option (#11893)
Summary: RocksDB's primary function is to facilitate read and write operations. Compactions, while essential for minimizing read amplifications and optimizing storage, can sometimes compete with these primary tasks. Especially during periods of high read/write traffic, it's vital to ensure that primary operations receive priority, avoiding any potential disruptions or slowdowns. Conversely, during off-peak times when traffic is minimal, it's an opportune moment to tackle low-priority tasks like TTL based compactions, optimizing resource usage. In this PR, we are incorporating the concept of off-peak time into RocksDB by introducing `daily_offpeak_time_utc` within the DBOptions. This setting is formatted as "HH:mm-HH:mm" where the first one before "-" is the start time and the second one is the end time, inclusive. It will be later used for resource optimization in subsequent PRs. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11893 Test Plan: - New Unit Test Added - `DBOptionsTest::OffPeakTimes` - Existing Unit Test Updated - `OptionsTest`, `OptionsSettableTest` Reviewed By: pdillinger Differential Revision: D49714553 Pulled By: jaykorean fbshipit-source-id: fef51ea7c0fede6431c715bff116ddbb567c8752 |
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anand76
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269478ee46 |
Support compressed and local flash secondary cache stacking (#11812)
Summary: This PR implements support for a three tier cache - primary block cache, compressed secondary cache, and a nvm (local flash) secondary cache. This allows more effective utilization of the nvm cache, and minimizes the number of reads from local flash by caching compressed blocks in the compressed secondary cache. The basic design is as follows - 1. A new secondary cache implementation, ```TieredSecondaryCache```, is introduced. It keeps the compressed and nvm secondary caches and manages the movement of blocks between them and the primary block cache. To setup a three tier cache, we allocate a ```CacheWithSecondaryAdapter```, with a ```TieredSecondaryCache``` instance as the secondary cache. 2. The table reader passes both the uncompressed and compressed block to ```FullTypedCacheInterface::InsertFull```, allowing the block cache to optionally store the compressed block. 3. When there's a miss, the block object is constructed and inserted in the primary cache, and the compressed block is inserted into the nvm cache by calling ```InsertSaved```. This avoids the overhead of recompressing the block, as well as avoiding putting more memory pressure on the compressed secondary cache. 4. When there's a hit in the nvm cache, we attempt to insert the block in the compressed secondary cache and the primary cache, subject to the admission policy of those caches (i.e admit on second access). Blocks/items evicted from any tier are simply discarded. We can easily implement additional admission policies if desired. Todo (In a subsequent PR): 1. Add to db_bench and run benchmarks 2. Add to db_stress Pull Request resolved: https://github.com/facebook/rocksdb/pull/11812 Reviewed By: pdillinger Differential Revision: D49461842 Pulled By: anand1976 fbshipit-source-id: b40ac1330ef7cd8c12efa0a3ca75128e602e3a0b |
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Peter Dillinger
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1c6faf3587 |
Make RibbonFilterPolicy::bloom_before_level mutable (SetOptions()) (#11838)
Summary: An internal user wants to be able to dynamically switch between Bloom and Ribbon filters, without a custom FilterPolicy. Making `filter_policy` mutable would actually make issue https://github.com/facebook/rocksdb/issues/10079 worse, because it would be a race on a pointer field, not just on scalars. As a reasonable compromise until that is fixed, I am enabling dynamic control over Bloom vs. Ribbon choice by making RibbonFilterPolicy::bloom_before_level mutable, and doing that safely by using an atomic. I've also slightly tweaked the interpretation of that field so that setting it to INT_MAX really means "always Bloom." Pull Request resolved: https://github.com/facebook/rocksdb/pull/11838 Test Plan: unit tests added/extended. crash test updated for SetOptions call and tested under TSAN with amplified probability (lower set_options_one_in). Reviewed By: ajkr Differential Revision: D49296284 Pulled By: pdillinger fbshipit-source-id: e4251c077510df9a9c719876f482448c0d15402a |
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Hui Xiao
|
3ebf10e0ac |
Info-log stats level on db open (#11840)
Summary:
**Context/Summary:**
It is useful to ensure users set the stats level right for enable detailed timers like ``rocksdb.file.read.{get|multiget|db.iterator|verify.checksum|verify.file.checksums}.micros`
Pull Request resolved: https://github.com/facebook/rocksdb/pull/11840
Test Plan:
- Manually checking LOG with db bench
```
./db_bench --benchmarks="fillrandom" --file_checksum=1 --num=100 --db=/dev/shm/rocksdb --statistics=0 --stats_level=2
2023/09/14-15:30:17.139022 2353133 Options.statistics: (nil)
2023/09/14-15:30:17.139025 2353133 Options.use_fsync: 0
./db_bench --benchmarks="fillrandom" --file_checksum=1 --num=100 --db=/dev/shm/rocksdb --statistics=1 --stats_level=0
2023/09/14-15:30:44.390827 2355026 Options.statistics: 0x7f7c6d449290
2023/09/14-15:30:44.390830 2355026 Options.statistics stats level: 0
2023/09/14-15:30:44.390833 2355026 Options.use_fsync: 0
./db_bench --benchmarks="fillrandom" --file_checksum=1 --num=100 --db=/dev/shm/rocksdb --statistics=1 --stats_level=4
2023/09/14-15:31:04.466116 2356374 Options.statistics: 0x7f84c8649290
2023/09/14-15:31:04.466119 2356374 Options.statistics stats level: 4
2023/09/14-15:31:04.466122 2356374 Options.use_fsync: 0
```
Reviewed By: ajkr
Differential Revision: D49296354
Pulled By: hx235
fbshipit-source-id: b1b4b911544b6fa8c3fe1dbbd65c3bedfef4b50a
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Changyu Bi
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c2aad555c3 |
Add `CompressionOptions::checksum` for enabling ZSTD checksum (#11666)
Summary:
Optionally enable zstd checksum flag (
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anand76
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a1743e85be |
Implement a allow cache hits admission policy for the compressed secondary cache (#11713)
Summary: This PR implements a new admission policy for the compressed secondary cache, which includes the functionality of the existing policy, and also admits items evicted from the primary block cache with the hit bit set. Effectively, the new policy works as follows - 1. When an item is demoted from the primary cache without a hit, a placeholder is inserted in the compressed cache. A second demotion will insert the full entry. 2. When an item is promoted from the compressed cache to the primary cache for the first time, a placeholder is inserted in the primary. The second promotion inserts the full entry, while erasing it form the compressed cache. 3. If an item is demoted from the primary cache with the hit bit set, it is immediately inserted in the compressed secondary cache. The ```TieredVolatileCacheOptions``` has been updated with a new option, ```adm_policy```, which allows the policy to be selected. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11713 Reviewed By: pdillinger Differential Revision: D48444512 Pulled By: anand1976 fbshipit-source-id: b4cbf8c169a88097dff08e36e8bc4b3088de1492 |
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Yu Zhang
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1e77e35d26 |
Add a per column family default temperature option for accounting (#11708)
Summary: Add a column family option `default_temperature` that will be used for file reading accounting purpose, such as io statistics, for files that don't have an explicitly set temperature. This options is not a mutable one, changing its value would require a DB restart. This is to avoid the confusion that had the option being a mutable one, the users may expect it to take effect on all files immediately, while in reality, it would only become effective for SST files opened in the future. This `default_temperature` also just affect accounting during one DB session. It won't be recorded in manifest as the file's temperature and can be different across different DB sessions. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11708 Test Plan: ``` make all check ``` Reviewed By: pdillinger Differential Revision: D48375763 Pulled By: jowlyzhang fbshipit-source-id: eb756696c14a694c6e2a93d2bb6f040563194981 |
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Changyu Bi
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d1ff401472 |
Delay bottommost level single file compactions (#11701)
Summary: For leveled compaction, RocksDB has a special kind of compaction with reason "kBottommmostFiles" that compacts bottommost level files to clear data held by snapshots (more detail in https://github.com/facebook/rocksdb/issues/3009). Such compactions can happen soon after a relevant snapshot is released. For some use cases, a bottommost file may contain only a small amount of keys that can be cleared, so compacting such a file has a high write amp. In addition, these bottommost files may be compacted in compactions with reason other than "kBottommmostFiles" if we wait for some time (so that enough data is ingested to trigger such a compaction). This PR introduces an option `bottommost_file_compaction_delay` to specify the delay of these bottommost level single file compactions. * The main change is in `VersionStorageInfo::ComputeBottommostFilesMarkedForCompaction()` where we only add a file to `bottommost_files_marked_for_compaction_` if it oldest_snapshot is larger than its non-zero largest_seqno **and** the file is old enough. Note that if a file is not old enough but its largest_seqno is less than oldest_snapshot, we exclude it from the calculation of `bottommost_files_mark_threshold_`. This makes the change simpler, but such a file's eligibility for compaction will only be checked the next time `ComputeBottommostFilesMarkedForCompaction()` is called. This happens when a new Version is created (compaction, flush, SetOptions()...), a new enough snapshot is released (`VersionStorageInfo::UpdateOldestSnapshot()`) or when a compaction is picked and compaction score has to be re-calculated. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11701 Test Plan: * Add two unit tests to test when bottommost_file_compaction_delay > 0. * Ran crash test with the new option. Reviewed By: jaykorean, ajkr Differential Revision: D48331564 Pulled By: cbi42 fbshipit-source-id: c584f3dc5f6354fce3ed65f4c6366dc450b15ba8 |
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Changyu Bi
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76ed9a3990 |
Add missing status check when compiling with `ASSERT_STATUS_CHECKED=1` (#11686)
Summary:
It seems the flag `-fno-elide-constructors` is incorrectly overwritten in Makefile by
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Vardhan
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87a21d08fe |
Add an option to trigger flush when the number of range deletions reach a threshold (#11358)
Summary: Add a mutable column family option `memtable_max_range_deletions`. When non-zero, RocksDB will try to flush the current memtable after it has at least `memtable_max_range_deletions` range deletions. Java API is added and crash test is updated accordingly to randomly enable this option. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11358 Test Plan: * New unit test: `DBRangeDelTest.MemtableMaxRangeDeletions` * Ran crash test `python3 ./tools/db_crashtest.py whitebox --simple --memtable_max_range_deletions=20` and saw logs showing flushed memtables usually with 20 range deletions. Reviewed By: ajkr Differential Revision: D46582680 Pulled By: cbi42 fbshipit-source-id: f23d6fa8d8264ecf0a18d55c113ba03f5e2504da |
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Changyu Bi
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6a0f637633 |
Compare the number of input keys and processed keys for compactions (#11571)
Summary: ... to improve data integrity validation during compaction. A new option `compaction_verify_record_count` is introduced for this verification and is enabled by default. One exception when the verification is not done is when a compaction filter returns kRemoveAndSkipUntil which can cause CompactionIterator to seek until some key and hence not able to keep track of the number of keys processed. For expected number of input keys, we sum over the number of total keys - number of range tombstones across compaction input files (`CompactionJob::UpdateCompactionStats()`). Table properties are consulted if `FileMetaData` is not initialized for some input file. Since table properties for all input files were also constructed during `DBImpl::NotifyOnCompactionBegin()`, `Compaction::GetTableProperties()` is introduced to reduce duplicated code. For actual number of keys processed, each subcompaction will record its number of keys processed to `sub_compact->compaction_job_stats.num_input_records` and aggregated when all subcompactions finish (`CompactionJob::AggregateCompactionStats()`). In the case when some subcompaction encountered kRemoveAndSkipUntil from compaction filter and does not have accurate count, it propagates this information through `sub_compact->compaction_job_stats.has_num_input_records`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11571 Test Plan: * Add a new unit test `DBCompactionTest.VerifyRecordCount` for the corruption case. * All other unit tests for non-corrupted case. * Ran crash test for a few hours: `python3 ./tools/db_crashtest.py whitebox --simple` Reviewed By: ajkr Differential Revision: D47131965 Pulled By: cbi42 fbshipit-source-id: cc8e94565dd526c4347e9d3843ecf32f6727af92 |
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Peter Dillinger
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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 |