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83 Commits (eb99e080760bf86a9fd2b725df2fdeb1dd4df884)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Gang Liao
|
e6432dfd4c |
Make it possible to enable blob files starting from a certain LSM tree level (#10077)
Summary: Currently, if blob files are enabled (i.e. `enable_blob_files` is true), large values are extracted both during flush/recovery (when SST files are written into level 0 of the LSM tree) and during compaction into any LSM tree level. For certain use cases that have a mix of short-lived and long-lived values, it might make sense to support extracting large values only during compactions whose output level is greater than or equal to a specified LSM tree level (e.g. compactions into L1/L2/... or above). This could reduce the space amplification caused by large values that are turned into garbage shortly after being written at the price of some write amplification incurred by long-lived values whose extraction to blob files is delayed. In order to achieve this, we would like to do the following: - Add a new configuration option `blob_file_starting_level` (default: 0) to `AdvancedColumnFamilyOptions` (and `MutableCFOptions` and extend the related logic) - Instantiate `BlobFileBuilder` in `BuildTable` (used during flush and recovery, where the LSM tree level is L0) and `CompactionJob` iff `enable_blob_files` is set and the LSM tree level is `>= blob_file_starting_level` - Add unit tests for the new functionality, and add the new option to our stress tests (`db_stress` and `db_crashtest.py` ) - Add the new option to our benchmarking tool `db_bench` and the BlobDB benchmark script `run_blob_bench.sh` - Add the new option to the `ldb` tool (see https://github.com/facebook/rocksdb/wiki/Administration-and-Data-Access-Tool) - Ideally extend the C and Java bindings with the new option - Update the BlobDB wiki to document the new option. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10077 Reviewed By: ltamasi Differential Revision: D36884156 Pulled By: gangliao fbshipit-source-id: 942bab025f04633edca8564ed64791cb5e31627d |
2 years ago |
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Guido Tagliavini Ponce
|
b4d0e041d0 |
Add support for FastLRUCache in stress and crash tests. (#10081)
Summary: Stress tests can run with the experimental FastLRUCache. Crash tests randomly choose between LRUCache and FastLRUCache. Since only LRUCache supports a secondary cache, we validate the `--secondary_cache_uri` and `--cache_type` flags---when `--secondary_cache_uri` is set, the `--cache_type` is set to `lru_cache`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10081 Test Plan: - To test that the FastLRUCache is used and the stress test runs successfully, run `make -j24 CRASH_TEST_EXT_ARGS=—duration=960 blackbox_crash_test_with_atomic_flush`. The cache type should sometimes be `fast_lru_cache`. - To test the flag validation, run `make -j24 CRASH_TEST_EXT_ARGS="--duration=960 --secondary_cache_uri=x" blackbox_crash_test_with_atomic_flush` multiple times. The test will always be aborted (which is okay). Check that the cache type is always `lru_cache`. Reviewed By: anand1976 Differential Revision: D36839908 Pulled By: guidotag fbshipit-source-id: ebcdfdcd12ec04c96c09ae5b9c9d1e613bdd1725 |
2 years ago |
|
Changyu Bi
|
cc23b46da1 |
Support using ZDICT_finalizeDictionary to generate zstd dictionary (#9857)
Summary:
An untrained dictionary is currently simply the concatenation of several samples. The ZSTD API, ZDICT_finalizeDictionary(), can improve such a dictionary's effectiveness at low cost. This PR changes how dictionary is created by calling the ZSTD ZDICT_finalizeDictionary() API instead of creating raw content dictionary (when max_dict_buffer_bytes > 0), and pass in all buffered uncompressed data blocks as samples.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9857
Test Plan:
#### db_bench test for cpu/memory of compression+decompression and space saving on synthetic data:
Set up: change the parameter [here](
|
3 years ago |
|
Jay Zhuang
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c6d326d3d7 |
Track SST unique id in MANIFEST and verify (#9990)
Summary: Start tracking SST unique id in MANIFEST, which is used to verify with SST properties to make sure the SST file is not overwritten or misplaced. A DB option `try_verify_sst_unique_id` is introduced to enable/disable the verification, if enabled, it opens all SST files during DB-open to read the unique_id from table properties (default is false), so it's recommended to use it with `max_open_files = -1` to pre-open the files. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9990 Test Plan: unittests, format-compatible test, mini-crash Reviewed By: anand1976 Differential Revision: D36381863 Pulled By: jay-zhuang fbshipit-source-id: 89ea2eb6b35ed3e80ead9c724eb096083eaba63f |
3 years ago |
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Yanqin Jin
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e3a3dbf2be |
Avoid overwriting options loaded from OPTIONS (#9943)
Summary: This is similar to https://github.com/facebook/rocksdb/issues/9862, including the following fixes/refactoring: 1. If OPTIONS file is specified via `-options_file`, majority of options will be loaded from the file. We should not overwrite options that have been loaded from the file. Instead, we configure only fields of options which are shared objects and not set by the OPTIONS file. We also configure a few fields, e.g. `create_if_missing` necessary for stress test to run. 2. Refactor options initialization into three functions, `InitializeOptionsFromFile()`, `InitializeOptionsFromFlags()` and `InitializeOptionsGeneral()` similar to db_bench. I hope they can be shared in the future. The high-level logic is as follows: ```cpp if (!InitializeOptionsFromFile(...)) { InitializeOptionsFromFlags(...); } InitializeOptionsGeneral(...); ``` 3. Currently, the setting for `block_cache_compressed` does not seem correct because it by default specifies a size of `numeric_limits<size_t>::max()` ((size_t)-1). According to code comments, `-1` indicates default value, which should be referring to `num_shard_bits` argument. 4. Clarify `fail_if_options_file_error`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9943 Test Plan: 1. make check 2. Run stress tests, and manually check generated OPTIONS file and compare them with input OPTIONS files Reviewed By: jay-zhuang Differential Revision: D36133769 Pulled By: riversand963 fbshipit-source-id: 35dacdc090a0a72c922907170cd132b9ecaa073e |
3 years ago |
|
Hui Xiao
|
3573558ec5 |
Rewrite memory-charging feature's option API (#9926)
Summary: **Context:** Previous PR https://github.com/facebook/rocksdb/pull/9748, https://github.com/facebook/rocksdb/pull/9073, https://github.com/facebook/rocksdb/pull/8428 added separate flag for each charged memory area. Such API design is not scalable as we charge more and more memory areas. Also, we foresee an opportunity to consolidate this feature with other cache usage related features such as `cache_index_and_filter_blocks` using `CacheEntryRole`. Therefore we decided to consolidate all these flags with `CacheUsageOptions cache_usage_options` and this PR serves as the first step by consolidating memory-charging related flags. **Summary:** - Replaced old API reference with new ones, including making `kCompressionDictionaryBuildingBuffer` opt-out and added a unit test for that - Added missing db bench/stress test for some memory charging features - Renamed related test suite to indicate they are under the same theme of memory charging - Refactored a commonly used mocked cache component in memory charging related tests to reduce code duplication - Replaced the phrases "memory tracking" / "cache reservation" (other than CacheReservationManager-related ones) with "memory charging" for standard description of this feature. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9926 Test Plan: - New unit test for opt-out `kCompressionDictionaryBuildingBuffer` `TEST_F(ChargeCompressionDictionaryBuildingBufferTest, Basic)` - New unit test for option validation/sanitization `TEST_F(CacheUsageOptionsOverridesTest, SanitizeAndValidateOptions)` - CI - db bench (in case querying new options introduces regression) **+0.5% micros/op**: `TEST_TMPDIR=/dev/shm/testdb ./db_bench -benchmarks=fillseq -db=$TEST_TMPDIR -charge_compression_dictionary_building_buffer=1(remove this for comparison) -compression_max_dict_bytes=10000 -disable_auto_compactions=1 -write_buffer_size=100000 -num=4000000 | egrep 'fillseq'` #-run | (pre-PR) avg micros/op | std micros/op | (post-PR) micros/op | std micros/op | change (%) -- | -- | -- | -- | -- | -- 10 | 3.9711 | 0.264408 | 3.9914 | 0.254563 | 0.5111933721 20 | 3.83905 | 0.0664488 | 3.8251 | 0.0695456 | **-0.3633711465** 40 | 3.86625 | 0.136669 | 3.8867 | 0.143765 | **0.5289363078** - db_stress: `python3 tools/db_crashtest.py blackbox -charge_compression_dictionary_building_buffer=1 -charge_filter_construction=1 -charge_table_reader=1 -cache_size=1` killed as normal Reviewed By: ajkr Differential Revision: D36054712 Pulled By: hx235 fbshipit-source-id: d406e90f5e0c5ea4dbcb585a484ad9302d4302af |
3 years ago |
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Andrew Kryczka
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62d84e2a2b |
db_stress fault injection in release mode (#9957)
Summary: Previously all fault injection was ignored in release mode. This PR adds it back except for read fault injection (`--read_fault_one_in > 0`) since its dependency (`IGNORE_STATUS_IF_ERROR`) is unavailable in release mode. Other notable changes include: - Moved `EnableWriteErrorInjection()` for `--write_fault_one_in > 0` so it's after `DB::Open()` without depending on `SyncPoint` - Made `--read_fault_one_in > 0` return an error in release mode - Updated `db_crashtest.py` to always set `--read_fault_one_in=0` in release mode Pull Request resolved: https://github.com/facebook/rocksdb/pull/9957 Test Plan: ``` $ DEBUG_LEVEL=0 make -j24 db_stress $ DEBUG_LEVEL=0 TEST_TMPDIR=/dev/shm python3 tools/db_crashtest.py blackbox ``` Reviewed By: anand1976 Differential Revision: D36193830 Pulled By: ajkr fbshipit-source-id: 0b97946b4e3f06e3e0f6e7833c2763da08ec5321 |
3 years ago |
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Andrew Kryczka
|
a62506aee2 |
Enable unsynced data loss in crash test (#9947)
Summary:
`db_stress` already tracks expected state history to verify prefix-recoverability when `sync_fault_injection` is enabled. This PR enables `sync_fault_injection` in `db_crashtest.py`.
Previously enabling `sync_fault_injection` would cause whole unsynced files to be dropped. This PR adds a more interesting case of losing only the tail of unsynced data by implementing `TestFSWritableFile::RangeSync()` and enabling `{wal_,}bytes_per_sync`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9947
Test Plan:
- regular blackbox, blackbox --simple
- various commands to stress this new case, such as `TEST_TMPDIR=/dev/shm python3 tools/db_crashtest.py blackbox --max_key=100000 --write_buffer_size=2097152 --avoid_flush_during_recovery=1 --disable_wal=0 --interval=10 --db_write_buffer_size=0 --sync_fault_injection=1 --wal_compression=none --delpercent=0 --delrangepercent=0 --prefixpercent=0 --iterpercent=0 --writepercent=100 --readpercent=0 --wal_bytes_per_sync=131072 --duration=36000 --sync=0 --open_write_fault_one_in=16`
Reviewed By: riversand963
Differential Revision: D36152775
Pulled By: ajkr
fbshipit-source-id: 44b68a7fad0a4cf74af9fe1f39be01baab8141d8
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3 years ago |
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anand76
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c3d7e16252 |
Add WAL compression to stress tests (#9811)
Summary: Add the WAL compression feature to the stress test. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9811 Reviewed By: riversand963 Differential Revision: D35414316 Pulled By: anand1976 fbshipit-source-id: 0c17b1ec55679a52f088ad368798b57139bd921a |
3 years ago |
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Hui Xiao
|
49623f9c8e |
Account memory of big memory users in BlockBasedTable in global memory limit (#9748)
Summary: **Context:** Through heap profiling, we discovered that `BlockBasedTableReader` objects can accumulate and lead to high memory usage (e.g, `max_open_file = -1`). These memories are currently not saved, not tracked, not constrained and not cache evict-able. As a first step to improve this, similar to https://github.com/facebook/rocksdb/pull/8428, this PR is to track an estimate of `BlockBasedTableReader` object's memory in block cache and fail future creation if the memory usage exceeds the available space of cache at the time of creation. **Summary:** - Approximate big memory users (`BlockBasedTable::Rep` and `TableProperties` )' memory usage in addition to the existing estimated ones (filter block/index block/un-compression dictionary) - Charge all of these memory usages to block cache on `BlockBasedTable::Open()` and release them on `~BlockBasedTable()` as there is no memory usage fluctuation of concern in between - Refactor on CacheReservationManager (and its call-sites) to add concurrent support for BlockBasedTable used in this PR. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9748 Test Plan: - New unit tests - db bench: `OpenDb` : **-0.52% in ms** - Setup `./db_bench -benchmarks=fillseq -db=/dev/shm/testdb -disable_auto_compactions=1 -write_buffer_size=1048576` - Repeated run with pre-change w/o feature and post-change with feature, benchmark `OpenDb`: `./db_bench -benchmarks=readrandom -use_existing_db=1 -db=/dev/shm/testdb -reserve_table_reader_memory=true (remove this when running w/o feature) -file_opening_threads=3 -open_files=-1 -report_open_timing=true| egrep 'OpenDb:'` #-run | (feature-off) avg milliseconds | std milliseconds | (feature-on) avg milliseconds | std milliseconds | change (%) -- | -- | -- | -- | -- | -- 10 | 11.4018 | 5.95173 | 9.47788 | 1.57538 | -16.87382694 20 | 9.23746 | 0.841053 | 9.32377 | 1.14074 | 0.9343477536 40 | 9.0876 | 0.671129 | 9.35053 | 1.11713 | 2.893283155 80 | 9.72514 | 2.28459 | 9.52013 | 1.0894 | -2.108041632 160 | 9.74677 | 0.991234 | 9.84743 | 1.73396 | 1.032752389 320 | 10.7297 | 5.11555 | 10.547 | 1.97692 | **-1.70275031** 640 | 11.7092 | 2.36565 | 11.7869 | 2.69377 | **0.6635807741** - db bench on write with cost to cache in WriteBufferManager (just in case this PR's CRM refactoring accidentally slows down anything in WBM) : `fillseq` : **+0.54% in micros/op** `./db_bench -benchmarks=fillseq -db=/dev/shm/testdb -disable_auto_compactions=1 -cost_write_buffer_to_cache=true -write_buffer_size=10000000000 | egrep 'fillseq'` #-run | (pre-PR) avg micros/op | std micros/op | (post-PR) avg micros/op | std micros/op | change (%) -- | -- | -- | -- | -- | -- 10 | 6.15 | 0.260187 | 6.289 | 0.371192 | 2.260162602 20 | 7.28025 | 0.465402 | 7.37255 | 0.451256 | 1.267813605 40 | 7.06312 | 0.490654 | 7.13803 | 0.478676 | **1.060579461** 80 | 7.14035 | 0.972831 | 7.14196 | 0.92971 | **0.02254791432** - filter bench: `bloom filter`: **-0.78% in ms/key** - ` ./filter_bench -impl=2 -quick -reserve_table_builder_memory=true | grep 'Build avg'` #-run | (pre-PR) avg ns/key | std ns/key | (post-PR) ns/key | std ns/key | change (%) -- | -- | -- | -- | -- | -- 10 | 26.4369 | 0.442182 | 26.3273 | 0.422919 | **-0.4145720565** 20 | 26.4451 | 0.592787 | 26.1419 | 0.62451 | **-1.1465262** - Crash test `python3 tools/db_crashtest.py blackbox --reserve_table_reader_memory=1 --cache_size=1` killed as normal Reviewed By: ajkr Differential Revision: D35136549 Pulled By: hx235 fbshipit-source-id: 146978858d0f900f43f4eb09bfd3e83195e3be28 |
3 years ago |
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Akanksha Mahajan
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fd66005628 |
Add 'adaptive_readahead' and 'async_io' options to db_stress (#9750)
Summary: Same as title Pull Request resolved: https://github.com/facebook/rocksdb/pull/9750 Test Plan: export CRASH_TEST_EXT_ARGS=" --async_io=1 --adaptive_readahead=1; make -j crash_test Reviewed By: jay-zhuang Differential Revision: D35114326 Pulled By: akankshamahajan15 fbshipit-source-id: 8b05c95be09f7aff6cb9eb757aa20a6520349d45 |
3 years ago |
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Yanqin Jin
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5894761056 |
Improve stress test for transactions (#9568)
Summary: Test only, no change to functionality. Extremely low risk of library regression. Update test key generation by maintaining existing and non-existing keys. Update db_crashtest.py to drive multiops_txn stress test for both write-committed and write-prepared. Add a make target 'blackbox_crash_test_with_multiops_txn'. Running the following commands caught the bug exposed in https://github.com/facebook/rocksdb/issues/9571. ``` $rm -rf /tmp/rocksdbtest/* $./db_stress -progress_reports=0 -test_multi_ops_txns -use_txn -clear_column_family_one_in=0 \ -column_families=1 -writepercent=0 -delpercent=0 -delrangepercent=0 -customopspercent=60 \ -readpercent=20 -prefixpercent=0 -iterpercent=20 -reopen=0 -ops_per_thread=1000 -ub_a=10000 \ -ub_c=100 -destroy_db_initially=0 -key_spaces_path=/dev/shm/key_spaces_desc -threads=32 -read_fault_one_in=0 $./db_stress -progress_reports=0 -test_multi_ops_txns -use_txn -clear_column_family_one_in=0 -column_families=1 -writepercent=0 -delpercent=0 -delrangepercent=0 -customopspercent=60 -readpercent=20 \ -prefixpercent=0 -iterpercent=20 -reopen=0 -ops_per_thread=1000 -ub_a=10000 -ub_c=100 -destroy_db_initially=0 \ -key_spaces_path=/dev/shm/key_spaces_desc -threads=32 -read_fault_one_in=0 ``` Running the following command caught a bug which will be fixed in https://github.com/facebook/rocksdb/issues/9648 . ``` $TEST_TMPDIR=/dev/shm make blackbox_crash_test_with_multiops_wc_txn ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/9568 Reviewed By: jay-zhuang Differential Revision: D34308154 Pulled By: riversand963 fbshipit-source-id: 99ff1b65c19b46c471d2f2d3b47adcd342a1b9e7 |
3 years ago |
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Hui Xiao
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ca0ef54f16 |
Rate-limit automatic WAL flush after each user write (#9607)
Summary: **Context:** WAL flush is currently not rate-limited by `Options::rate_limiter`. This PR is to provide rate-limiting to auto WAL flush, the one that automatically happen after each user write operation (i.e, `Options::manual_wal_flush == false`), by adding `WriteOptions::rate_limiter_options`. Note that we are NOT rate-limiting WAL flush that do NOT automatically happen after each user write, such as `Options::manual_wal_flush == true + manual FlushWAL()` (rate-limiting multiple WAL flushes), for the benefits of: - being consistent with [ReadOptions::rate_limiter_priority](https://github.com/facebook/rocksdb/blob/7.0.fb/include/rocksdb/options.h#L515) - being able to turn off some WAL flush's rate-limiting but not all (e.g, turn off specific the WAL flush of a critical user write like a service's heartbeat) `WriteOptions::rate_limiter_options` only accept `Env::IO_USER` and `Env::IO_TOTAL` currently due to an implementation constraint. - The constraint is that we currently queue parallel writes (including WAL writes) based on FIFO policy which does not factor rate limiter priority into this layer's scheduling. If we allow lower priorities such as `Env::IO_HIGH/MID/LOW` and such writes specified with lower priorities occurs before ones specified with higher priorities (even just by a tiny bit in arrival time), the former would have blocked the latter, leading to a "priority inversion" issue and contradictory to what we promise for rate-limiting priority. Therefore we only allow `Env::IO_USER` and `Env::IO_TOTAL` right now before improving that scheduling. A pre-requisite to this feature is to support operation-level rate limiting in `WritableFileWriter`, which is also included in this PR. **Summary:** - Renamed test suite `DBRateLimiterTest to DBRateLimiterOnReadTest` for adding a new test suite - Accept `rate_limiter_priority` in `WritableFileWriter`'s private and public write functions - Passed `WriteOptions::rate_limiter_options` to `WritableFileWriter` in the path of automatic WAL flush. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9607 Test Plan: - Added new unit test to verify existing flush/compaction rate-limiting does not break, since `DBTest, RateLimitingTest` is disabled and current db-level rate-limiting tests focus on read only (e.g, `db_rate_limiter_test`, `DBTest2, RateLimitedCompactionReads`). - Added new unit test `DBRateLimiterOnWriteWALTest, AutoWalFlush` - `strace -ftt -e trace=write ./db_bench -benchmarks=fillseq -db=/dev/shm/testdb -rate_limit_auto_wal_flush=1 -rate_limiter_bytes_per_sec=15 -rate_limiter_refill_period_us=1000000 -write_buffer_size=100000000 -disable_auto_compactions=1 -num=100` - verified that WAL flush(i.e, system-call _write_) were chunked into 15 bytes and each _write_ was roughly 1 second apart - verified the chunking disappeared when `-rate_limit_auto_wal_flush=0` - crash test: `python3 tools/db_crashtest.py blackbox --disable_wal=0 --rate_limit_auto_wal_flush=1 --rate_limiter_bytes_per_sec=10485760 --interval=10` killed as normal **Benchmarked on flush/compaction to ensure no performance regression:** - compaction with rate-limiting (see table 1, avg over 1280-run): pre-change: **915635 micros/op**; post-change: **907350 micros/op (improved by 0.106%)** ``` #!/bin/bash TEST_TMPDIR=/dev/shm/testdb START=1 NUM_DATA_ENTRY=8 N=10 rm -f compact_bmk_output.txt compact_bmk_output_2.txt dont_care_output.txt for i in $(eval echo "{$START..$NUM_DATA_ENTRY}") do NUM_RUN=$(($N*(2**($i-1)))) for j in $(eval echo "{$START..$NUM_RUN}") do ./db_bench --benchmarks=fillrandom -db=$TEST_TMPDIR -disable_auto_compactions=1 -write_buffer_size=6710886 > dont_care_output.txt && ./db_bench --benchmarks=compact -use_existing_db=1 -db=$TEST_TMPDIR -level0_file_num_compaction_trigger=1 -rate_limiter_bytes_per_sec=100000000 | egrep 'compact' done > compact_bmk_output.txt && awk -v NUM_RUN=$NUM_RUN '{sum+=$3;sum_sqrt+=$3^2}END{print sum/NUM_RUN, sqrt(sum_sqrt/NUM_RUN-(sum/NUM_RUN)^2)}' compact_bmk_output.txt >> compact_bmk_output_2.txt done ``` - compaction w/o rate-limiting (see table 2, avg over 640-run): pre-change: **822197 micros/op**; post-change: **823148 micros/op (regressed by 0.12%)** ``` Same as above script, except that -rate_limiter_bytes_per_sec=0 ``` - flush with rate-limiting (see table 3, avg over 320-run, run on the [patch]( |
3 years ago |
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Andrew Kryczka
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babe56ddba |
Add rate limiter priority to ReadOptions (#9424)
Summary: Users can set the priority for file reads associated with their operation by setting `ReadOptions::rate_limiter_priority` to something other than `Env::IO_TOTAL`. Rate limiting `VerifyChecksum()` and `VerifyFileChecksums()` is the motivation for this PR, so it also includes benchmarks and minor bug fixes to get that working. `RandomAccessFileReader::Read()` already had support for rate limiting compaction reads. I changed that rate limiting to be non-specific to compaction, but rather performed according to the passed in `Env::IOPriority`. Now the compaction read rate limiting is supported by setting `rate_limiter_priority = Env::IO_LOW` on its `ReadOptions`. There is no default value for the new `Env::IOPriority` parameter to `RandomAccessFileReader::Read()`. That means this PR goes through all callers (in some cases multiple layers up the call stack) to find a `ReadOptions` to provide the priority. There are TODOs for cases I believe it would be good to let user control the priority some day (e.g., file footer reads), and no TODO in cases I believe it doesn't matter (e.g., trace file reads). The API doc only lists the missing cases where a file read associated with a provided `ReadOptions` cannot be rate limited. For cases like file ingestion checksum calculation, there is no API to provide `ReadOptions` or `Env::IOPriority`, so I didn't count that as missing. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9424 Test Plan: - new unit tests - new benchmarks on ~50MB database with 1MB/s read rate limit and 100ms refill interval; verified with strace reads are chunked (at 0.1MB per chunk) and spaced roughly 100ms apart. - setup command: `./db_bench -benchmarks=fillrandom,compact -db=/tmp/testdb -target_file_size_base=1048576 -disable_auto_compactions=true -file_checksum=true` - benchmarks command: `strace -ttfe pread64 ./db_bench -benchmarks=verifychecksum,verifyfilechecksums -use_existing_db=true -db=/tmp/testdb -rate_limiter_bytes_per_sec=1048576 -rate_limit_bg_reads=1 -rate_limit_user_ops=true -file_checksum=true` - crash test using IO_USER priority on non-validation reads with https://github.com/facebook/rocksdb/issues/9567 reverted: `python3 tools/db_crashtest.py blackbox --max_key=1000000 --write_buffer_size=524288 --target_file_size_base=524288 --level_compaction_dynamic_level_bytes=true --duration=3600 --rate_limit_bg_reads=true --rate_limit_user_ops=true --rate_limiter_bytes_per_sec=10485760 --interval=10` Reviewed By: hx235 Differential Revision: D33747386 Pulled By: ajkr fbshipit-source-id: a2d985e97912fba8c54763798e04f006ccc56e0c |
3 years ago |
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Hui Xiao
|
920386f2b7 |
Detect (new) Bloom/Ribbon Filter construction corruption (#9342)
Summary: Note: rebase on and merge after https://github.com/facebook/rocksdb/pull/9349, https://github.com/facebook/rocksdb/pull/9345, (optional) https://github.com/facebook/rocksdb/pull/9393 **Context:** (Quoted from pdillinger) Layers of information during new Bloom/Ribbon Filter construction in building block-based tables includes the following: a) set of keys to add to filter b) set of hashes to add to filter (64-bit hash applied to each key) c) set of Bloom indices to set in filter, with duplicates d) set of Bloom indices to set in filter, deduplicated e) final filter and its checksum This PR aims to detect corruption (e.g, unexpected hardware/software corruption on data structures residing in the memory for a long time) from b) to e) and leave a) as future works for application level. - b)'s corruption is detected by verifying the xor checksum of the hash entries calculated as the entries accumulate before being added to the filter. (i.e, `XXPH3FilterBitsBuilder::MaybeVerifyHashEntriesChecksum()`) - c) - e)'s corruption is detected by verifying the hash entries indeed exists in the constructed filter by re-querying these hash entries in the filter (i.e, `FilterBitsBuilder::MaybePostVerify()`) after computing the block checksum (except for PartitionFilter, which is done right after each `FilterBitsBuilder::Finish` for impl simplicity - see code comment for more). For this stage of detection, we assume hash entries are not corrupted after checking on b) since the time interval from b) to c) is relatively short IMO. Option to enable this feature of detection is `BlockBasedTableOptions::detect_filter_construct_corruption` which is false by default. **Summary:** - Implemented new functions `XXPH3FilterBitsBuilder::MaybeVerifyHashEntriesChecksum()` and `FilterBitsBuilder::MaybePostVerify()` - Ensured hash entries, final filter and banding and their [cache reservation ](https://github.com/facebook/rocksdb/issues/9073) are released properly despite corruption - See [Filter.construction.artifacts.release.point.pdf ](https://github.com/facebook/rocksdb/files/7923487/Design.Filter.construction.artifacts.release.point.pdf) for high-level design - Bundled and refactored hash entries's related artifact in XXPH3FilterBitsBuilder into `HashEntriesInfo` for better control on lifetime of these artifact during `SwapEntires`, `ResetEntries` - Ensured RocksDB block-based table builder calls `FilterBitsBuilder::MaybePostVerify()` after constructing the filter by `FilterBitsBuilder::Finish()` - When encountering such filter construction corruption, stop writing the filter content to files and mark such a block-based table building non-ok by storing the corruption status in the builder. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9342 Test Plan: - Added new unit test `DBFilterConstructionCorruptionTestWithParam.DetectCorruption` - Included this new feature in `DBFilterConstructionReserveMemoryTestWithParam.ReserveMemory` as this feature heavily touch ReserveMemory's impl - For fallback case, I run `./filter_bench -impl=3 -detect_filter_construct_corruption=true -reserve_table_builder_memory=true -strict_capacity_limit=true -quick -runs 10 | grep 'Build avg'` to make sure nothing break. - Added to `filter_bench`: increased filter construction time by **30%**, mostly by `MaybePostVerify()` - FastLocalBloom - Before change: `./filter_bench -impl=2 -quick -runs 10 | grep 'Build avg'`: **28.86643s** - After change: - `./filter_bench -impl=2 -detect_filter_construct_corruption=false -quick -runs 10 | grep 'Build avg'` (expect a tiny increase due to MaybePostVerify is always called regardless): **27.6644s (-4% perf improvement might be due to now we don't drop bloom hash entry in `AddAllEntries` along iteration but in bulk later, same with the bypassing-MaybePostVerify case below)** - `./filter_bench -impl=2 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'` (expect acceptable increase): **34.41159s (+20%)** - `./filter_bench -impl=2 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'` (by-passing MaybePostVerify, expect minor increase): **27.13431s (-6%)** - Standard128Ribbon - Before change: `./filter_bench -impl=3 -quick -runs 10 | grep 'Build avg'`: **122.5384s** - After change: - `./filter_bench -impl=3 -detect_filter_construct_corruption=false -quick -runs 10 | grep 'Build avg'` (expect a tiny increase due to MaybePostVerify is always called regardless - verified by removing MaybePostVerify under this case and found only +-1ns difference): **124.3588s (+2%)** - `./filter_bench -impl=3 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'`(expect acceptable increase): **159.4946s (+30%)** - `./filter_bench -impl=3 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'`(by-passing MaybePostVerify, expect minor increase) : **125.258s (+2%)** - Added to `db_stress`: `make crash_test`, `./db_stress --detect_filter_construct_corruption=true` - Manually smoke-tested: manually corrupted the filter construction in some db level tests with basic PUT and background flush. As expected, the error did get returned to users in subsequent PUT and Flush status. Reviewed By: pdillinger Differential Revision: D33746928 Pulled By: hx235 fbshipit-source-id: cb056426be5a7debc1cd16f23bc250f36a08ca57 |
3 years ago |
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Andrew Kryczka
|
ed75dddc35 |
Optimize db_stress setup phase (#9475)
Summary: It is too slow that our `db_crashtest.py` often kills `db_stress` before the setup phase completes. Profiled it and found a few ways to optimize. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9475 Test Plan: Measured setup phase time reduced 22% (36 -> 28 seconds) for first run, and 36% (38 -> 24 seconds) for non-first run on empty-ish DB. - first run benchmark command: `rm -rf /dev/shm/dbstress*/ && mkdir -p /dev/shm/dbstress_expected/ && ./db_stress -max_key=100000000 -destroy_db_initially=1 -expected_values_dir=/dev/shm/dbstress_expected/ -db=/dev/shm/dbstress/ --clear_column_family_one_in=0 --reopen=0 --nooverwritepercent=1` output before this PR: ``` 2022/01/31-11:14:05 Initializing db_stress ... 2022/01/31-11:14:41 Starting database operations ``` output after this PR: ``` ... 2022/01/31-11:12:23 Initializing db_stress ... 2022/01/31-11:12:51 Starting database operations ``` - non-first run benchmark command: `./db_stress -max_key=100000000 -destroy_db_initially=0 -expected_values_dir=/dev/shm/dbstress_expected/ -db=/dev/shm/dbstress/ --clear_column_family_one_in=0 --reopen=0 --nooverwritepercent=1` output before this PR: ``` 2022/01/31-11:20:45 Initializing db_stress ... 2022/01/31-11:21:23 Starting database operations ``` output after this PR: ``` 2022/01/31-11:22:02 Initializing db_stress ... 2022/01/31-11:22:26 Starting database operations ``` - ran minified crash test a while: `DEBUG_LEVEL=0 TEST_TMPDIR=/dev/shm python3 tools/db_crashtest.py blackbox --simple --interval=10 --max_key=1000000 --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --value_size_mult=33` Reviewed By: anand1976 Differential Revision: D33897793 Pulled By: ajkr fbshipit-source-id: 0d7b2c93e1e2a9f8a878e87632c2455406313087 |
3 years ago |
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Peter Dillinger
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78aee6fedc |
Remove obsolete backupable_db.h, utility_db.h (#9438)
Summary: This also removes the obsolete names BackupableDBOptions and UtilityDB. API users must now use BackupEngineOptions and DBWithTTL::Open. In C API, `rocksdb_backupable_db_*` is replaced `rocksdb_backup_engine_*`. Similar renaming in Java API. In reference to https://github.com/facebook/rocksdb/issues/9389 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9438 Test Plan: CI Reviewed By: mrambacher Differential Revision: D33780269 Pulled By: pdillinger fbshipit-source-id: 4a6cfc5c1b4c78bcad790b9d3dd13c5fdf4a1fac |
3 years ago |
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Aravind Ramesh
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2eac6bb120 |
db_stress: db_stress fails on custom filesystems. (#9352)
Summary: db_stress listener service always uses default filesystem to operate, causing it to not recognize custom filesystem (like ZenFS plugin FS). Pass the env to db_stress listener with the correct filesystem information, so it can open the user intended filesystem. Signed-off-by: Aravind Ramesh <Aravind.Ramesh@wdc.com> Pull Request resolved: https://github.com/facebook/rocksdb/pull/9352 Reviewed By: riversand963 Differential Revision: D33776762 Pulled By: pdillinger fbshipit-source-id: e79bb9a544384f80ae9dd0108241ab9c83223954 |
3 years ago |
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Yanqin Jin
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50135c1bf3 |
Move HDFS support to separate repo (#9170)
Summary: This PR moves HDFS support from RocksDB repo to a separate repo. The new (temporary?) repo in this PR serves as an example before we finalize the decision on where and who to host hdfs support. At this point, people can start from the example repo and fork. Java/JNI is not included yet, and needs to be done later if necessary. The goal is to include this commit in RocksDB 7.0 release. Reference: https://github.com/ajkr/dedupfs by ajkr Pull Request resolved: https://github.com/facebook/rocksdb/pull/9170 Test Plan: Follow the instructions in https://github.com/riversand963/rocksdb-hdfs-env/blob/master/README.md. Build and run db_bench and db_stress. make check Reviewed By: ajkr Differential Revision: D33751662 Pulled By: riversand963 fbshipit-source-id: 22b4db7f31762ed417a20239f5a08dcd1696244f |
3 years ago |
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Andrew Kryczka
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c9818b3325 |
db_stress verify with lost unsynced operations (#8966)
Summary: When a previous run left behind historical state/trace files (implying it was run with --sync_fault_injection set), this PR uses them to restore the expected state according to the DB's recovered sequence number. That way, a tail of latest unsynced operations are permitted to be dropped, as is the case when data in page cache or certain `Env`s is lost. The point of the verification in this scenario is just to ensure there is no hole in the recovered data. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8966 Test Plan: - ran it a while, made sure it is restoring expected values using the historical state/trace files: ``` $ rm -rf ./tmp-db/ ./exp/ && mkdir -p ./tmp-db/ ./exp/ && while ./db_stress -compression_type=none -clear_column_family_one_in=0 -expected_values_dir=./exp -sync_fault_injection=1 -destroy_db_initially=0 -db=./tmp-db -max_key=1000000 -ops_per_thread=10000 -reopen=0 -threads=32 ; do : ; done ``` Reviewed By: pdillinger Differential Revision: D31219445 Pulled By: ajkr fbshipit-source-id: f0e1d51fe5b35465b00565c33331190ea38ba0ad |
3 years ago |
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Yanqin Jin
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e05c2bb549 |
Stress test for RocksDB transactions (#8936)
Summary: Current db_stress does not cover complex read-write transactions. Therefore, this PR adds coverage for emulated MyRocks-style transactions in `MultiOpsTxnsStressTest`. To achieve this, we need: - Add a new operation type 'customops' so that we can add new complex groups of operations, e.g. transactions involving multiple read-write operations. - Implement three read-write transactions and two read-only ones to emulate MyRocks-style transactions. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8936 Test Plan: ``` make check ./db_stress -test_multi_ops_txns -use_txn -clear_column_family_one_in=0 -column_families=1 -writepercent=0 -delpercent=0 -delrangepercent=0 -customopspercent=60 -readpercent=20 -prefixpercent=0 -iterpercent=20 -reopen=0 -ops_per_thread=100000 ``` Next step is to add more configurability and refine input generation and result reporting, which will done in separate follow-up PRs. Reviewed By: zhichao-cao Differential Revision: D31071795 Pulled By: riversand963 fbshipit-source-id: 50d7c828346ec643311336b904848a1588a37006 |
3 years ago |
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Akanksha Mahajan
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9e4d56f2c9 |
Fix segmentation fault in table_options.prepopulate_block_cache when used with partition_filters (#9263)
Summary: When table_options.prepopulate_block_cache is set to BlockBasedTableOptions::PrepopulateBlockCache::kFlushOnly and table_options.partition_filters is also set true, then there is segmentation failure when top level filter is fetched because its entered with wrong type in cache. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9263 Test Plan: Updated unit tests; Ran db_stress: make crash_test -j32 Reviewed By: pdillinger Differential Revision: D32936566 Pulled By: akankshamahajan15 fbshipit-source-id: 8bd79e53830d3e3c1bb79787e1ffbc3cb46d4426 |
3 years ago |
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Levi Tamasi
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dc5de45af8 |
Support readahead during compaction for blob files (#9187)
Summary: The patch adds a new BlobDB configuration option `blob_compaction_readahead_size` that can be used to enable prefetching data from blob files during compaction. This is important when using storage with higher latencies like HDDs or remote filesystems. If enabled, prefetching is used for all cases when blobs are read during compaction, namely garbage collection, compaction filters (when the existing value has to be read from a blob file), and `Merge` (when the value of the base `Put` is stored in a blob file). Pull Request resolved: https://github.com/facebook/rocksdb/pull/9187 Test Plan: Ran `make check` and the stress/crash test. Reviewed By: riversand963 Differential Revision: D32565512 Pulled By: ltamasi fbshipit-source-id: 87be9cebc3aa01cc227bec6b5f64d827b8164f5d |
3 years ago |
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anand76
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78556c14dd |
Secondary cache error injection (#9002)
Summary: Implement secondary cache error injection in db_stress. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9002 Reviewed By: zhichao-cao Differential Revision: D31874896 Pulled By: anand1976 fbshipit-source-id: 8cf04c061a4a44efa0fe88423d05cade67b85f73 |
3 years ago |
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Levi Tamasi
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3e1bf771a3 |
Make it possible to force the garbage collection of the oldest blob files (#8994)
Summary: The current BlobDB garbage collection logic works by relocating the valid blobs from the oldest blob files as they are encountered during compaction, and cleaning up blob files once they contain nothing but garbage. However, with sufficiently skewed workloads, it is theoretically possible to end up in a situation when few or no compactions get scheduled for the SST files that contain references to the oldest blob files, which can lead to increased space amp due to the lack of GC. In order to efficiently handle such workloads, the patch adds a new BlobDB configuration option called `blob_garbage_collection_force_threshold`, which signals to BlobDB to schedule targeted compactions for the SST files that keep alive the oldest batch of blob files if the overall ratio of garbage in the given blob files meets the threshold *and* all the given blob files are eligible for GC based on `blob_garbage_collection_age_cutoff`. (For example, if the new option is set to 0.9, targeted compactions will get scheduled if the sum of garbage bytes meets or exceeds 90% of the sum of total bytes in the oldest blob files, assuming all affected blob files are below the age-based cutoff.) The net result of these targeted compactions is that the valid blobs in the oldest blob files are relocated and the oldest blob files themselves cleaned up (since *all* SST files that rely on them get compacted away). These targeted compactions are similar to periodic compactions in the sense that they force certain SST files that otherwise would not get picked up to undergo compaction and also in the sense that instead of merging files from multiple levels, they target a single file. (Note: such compactions might still include neighboring files from the same level due to the need of having a "clean cut" boundary but they never include any files from any other level.) This functionality is currently only supported with the leveled compaction style and is inactive by default (since the default value is set to 1.0, i.e. 100%). Pull Request resolved: https://github.com/facebook/rocksdb/pull/8994 Test Plan: Ran `make check` and tested using `db_bench` and the stress/crash tests. Reviewed By: riversand963 Differential Revision: D31489850 Pulled By: ltamasi fbshipit-source-id: 44057d511726a0e2a03c5d9313d7511b3f0c4eab |
3 years ago |
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Andrew Kryczka
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559943cdc0 |
Refactor expected state in stress/crash test (#8913)
Summary: This is a precursor refactoring to enable an upcoming feature: persistence failure correctness testing. - Changed `--expected_values_path` to `--expected_values_dir` and migrated "db_crashtest.py" to use the new flag. For persistence failure correctness testing there are multiple possible correct states since unsynced data is allowed to be dropped. Making it possible to restore all these possible correct states will eventually involve files containing snapshots of expected values and DB trace files. - The expected values directory is managed by an `ExpectedStateManager` instance. Managing expected state files is separated out of `SharedState` to prevent `SharedState` from becoming too complex when the new files and features (snapshotting, tracing, and restoring) are introduced. - Migrated expected values file access/management out of `SharedState` into a separate class called `ExpectedState`. This is not exposed directly to the test but rather the `ExpectedState` for the latest values file is accessed via a pass-through API on `ExpectedStateManager`. This forces the test to always access the single latest `ExpectedState`. - Changed the initialization of the latest expected values file to use a tempfile followed by rename, and also add cleanup logic for possible stranded tempfiles. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8913 Test Plan: run in several ways; try to make sure it's not obviously broken. - crashtest blackbox without TEST_TMPDIR ``` $ python3 tools/db_crashtest.py blackbox --simple --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --max_key=100000 --value_size_mult=33 --compression_type=none --duration=120 --interval=10 --compression_type=none --blob_compression_type=none ``` - crashtest blackbox with TEST_TMPDIR ``` $ TEST_TMPDIR=/dev/shm python3 tools/db_crashtest.py blackbox --simple --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --max_key=100000 --value_size_mult=33 --compression_type=none --duration=120 --interval=10 --compression_type=none --blob_compression_type=none ``` - crashtest whitebox with TEST_TMPDIR ``` $ TEST_TMPDIR=/dev/shm python3 tools/db_crashtest.py whitebox --simple --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --max_key=100000 --value_size_mult=33 --compression_type=none --duration=120 --interval=10 --compression_type=none --blob_compression_type=none --random_kill_odd=88887 ``` - db_stress without expected_values_dir ``` $ ./db_stress --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --max_key=100000 --value_size_mult=33 --compression_type=none --ops_per_thread=10000 --clear_column_family_one_in=0 --destroy_db_initially=true ``` - db_stress with expected_values_dir and manual corruption ``` $ ./db_stress --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --max_key=100000 --value_size_mult=33 --compression_type=none --ops_per_thread=10000 --clear_column_family_one_in=0 --destroy_db_initially=true --expected_values_dir=./ // modify one byte in "./LATEST.state" $ ./db_stress --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --max_key=100000 --value_size_mult=33 --compression_type=none --ops_per_thread=10000 --clear_column_family_one_in=0 --destroy_db_initially=false --expected_values_dir=./ ... Verification failed for column family 0 key 0000000000000000 (0): Value not found: NotFound: ... ``` Reviewed By: riversand963 Differential Revision: D30921951 Pulled By: ajkr fbshipit-source-id: babfe218062e55d018c9b046536c0289fb78f41c |
3 years ago |
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Peter Dillinger
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2a383f21f4 |
Add Bloom/Ribbon hybrid API support (#8679)
Summary: This is essentially resurrection and fixing of the part of https://github.com/facebook/rocksdb/issues/8198 that was reverted in https://github.com/facebook/rocksdb/issues/8212, using data added in https://github.com/facebook/rocksdb/issues/8246. Basically, when configuring Ribbon filter, you can specify an LSM level before which Bloom will be used instead of Ribbon. But Bloom is only considered for Leveled and Universal compaction styles and file going into a known LSM level. This way, SST file writer, FIFO compaction, etc. use Ribbon filter as you would expect with NewRibbonFilterPolicy. So that this can be controlled with a single int value and so that flushes can be distinguished from intra-L0, we consider flush to go to level -1 for the purposes of this option. (Explained in API comment.) I also expect the most common and recommended Ribbon configuration to use Bloom during flush, to minimize slowing down writes and because according to my estimates, Ribbon only pays off if the structure lives in memory for more than an hour. Thus, I have changed the default for NewRibbonFilterPolicy to be this mild hybrid configuration. I don't really want to add something like NewHybridFilterPolicy because at least the mild hybrid configuration (Bloom for flush, Ribbon otherwise) should be considered a natural choice. C APIs also updated, but because they don't support overloading, rocksdb_filterpolicy_create_ribbon is kept pure ribbon for clarity and rocksdb_filterpolicy_create_ribbon_hybrid must be called for a hybrid configuration. While touching C API, I changed bits per key options from int to double. BuiltinFilterPolicy is needed so that LevelThresholdFilterPolicy doesn't inherit unused fields from BloomFilterPolicy. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8679 Test Plan: new + updated tests, including crash test Reviewed By: jay-zhuang Differential Revision: D30445797 Pulled By: pdillinger fbshipit-source-id: 6f5aeddfd6d79f7e55493b563c2d1d2d568892e1 |
3 years ago |
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Baptiste Lemaire
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e3a96c4823 |
Memtable sampling for mempurge heuristic. (#8628)
Summary: Changes the API of the MemPurge process: the `bool experimental_allow_mempurge` and `experimental_mempurge_policy` flags have been replaced by a `double experimental_mempurge_threshold` option. This change of API reflects another major change introduced in this PR: the MemPurgeDecider() function now works by sampling the memtables being flushed to estimate the overall amount of useful payload (payload minus the garbage), and then compare this useful payload estimate with the `double experimental_mempurge_threshold` value. Therefore, when the value of this flag is `0.0` (default value), mempurge is simply deactivated. On the other hand, a value of `DBL_MAX` would be equivalent to always going through a mempurge regardless of the garbage ratio estimate. At the moment, a `double experimental_mempurge_threshold` value else than 0.0 or `DBL_MAX` is opnly supported`with the `SkipList` memtable representation. Regarding the sampling, this PR includes the introduction of a `MemTable::UniqueRandomSample` function that collects (approximately) random entries from the memtable by using the new `SkipList::Iterator::RandomSeek()` under the hood, or by iterating through each memtable entry, depending on the target sample size and the total number of entries. The unit tests have been readapted to support this new API. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8628 Reviewed By: pdillinger Differential Revision: D30149315 Pulled By: bjlemaire fbshipit-source-id: 1feef5390c95db6f4480ab4434716533d3947f27 |
3 years ago |
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Baptiste Lemaire
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d6006f9c9b |
Add experimental mempurge policy flag to db_stress. (#8588)
Summary: Add `experimental_mempurge_policy` flag to `db_stress` and `db_crashtest.py`. This flag is only read if the `experimental_allow_mempurge` flag is set to `true`. This flag can take the following values: `kAlways`, and `kAlternate` (default). - `kAlways`: a flush is always redirected to a mempurge. If the mempurge aborts, the a regular flush proceeds. - `kAlternate`: if one or more of the flush input memtables is an mempurge output memtable, then a flush is performed, else a mempurge is carried out. Similar to kAlways, if a mempurge aborts, the FlushJob proceeds to a regular flush to storage. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8588 Reviewed By: pdillinger Differential Revision: D29934251 Pulled By: bjlemaire fbshipit-source-id: 90c1debed2029b9915d066914556547507c33dae |
3 years ago |
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Baptiste Lemaire
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0229a88dfe |
Crashtest mempurge (#8545)
Summary: Add `experiemental_allow_mempurge` flag support for `db_stress` and `db_crashtest.py`, with a `false` default value. I succesfully tested locally both `whitebox` and `blackbox` crash tests with `experiemental_allow_mempurge` flag set as true. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8545 Reviewed By: akankshamahajan15 Differential Revision: D29734513 Pulled By: bjlemaire fbshipit-source-id: 24316c0eccf6caf409e95c035f31d822c66714ae |
3 years ago |
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anand76
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6f9ed59b1d |
Allow db_stress to use a secondary cache (#8455)
Summary: Add a ```-secondary_cache_uri``` to db_stress to allow the user to specify a custom ```SecondaryCache``` object from the object registry. Also allow db_crashtest.py to be run with an alternate db_stress location. Together, these changes will allow us to run db_stress using FB internal components. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8455 Reviewed By: zhichao-cao Differential Revision: D29371972 Pulled By: anand1976 fbshipit-source-id: dd1b1fd80ebbedc11aa63d9246ea6ae49edb77c4 |
3 years ago |
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Andrew Kryczka
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0f42e50fec |
Fix `GetLiveFiles()` returning OPTIONS-000000 (#8268)
Summary: See release note in HISTORY.md. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8268 Test Plan: unit test repro Reviewed By: siying Differential Revision: D28227901 Pulled By: ajkr fbshipit-source-id: faf61d13b9e43a761e3d5dcf8203923126b51339 |
4 years ago |
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Peter Dillinger
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95f6add746 |
Revert Ribbon starting level support from #8198 (#8212)
Summary:
This partially reverts commit
|
4 years ago |
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Peter Dillinger
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10196d7edc |
Ribbon long-term support, starting level support (#8198)
Summary: Since the Ribbon filter schema seems good (compatible back to 6.15.0), this change commits to long term support of the SST schema, even though we expect the API for enabling Ribbon to change (still called NewExperimentalRibbonFilterPolicy). This also adds support for "hybrid" configuration in which some levels use Bloom (higher levels, lower numbered) for speed and the rest use Ribbon (lower levels, higher numbered) for memory space efficiency. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8198 Test Plan: unit test added, crash test support Reviewed By: jay-zhuang Differential Revision: D27831232 Pulled By: pdillinger fbshipit-source-id: 90e528677689474d293ed6710b42ba89fbd5b5ab |
4 years ago |
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Yanqin Jin
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08144bc2f5 |
Add user-defined timestamps to db_stress (#8061)
Summary: Add some basic test for user-defined timestamp to db_stress. Currently, read with timestamp always tries to read using the current timestamp. Due to the per-key timestamp-sequence ordering constraint, we only add timestamp- related tests to the `NonBatchedOpsStressTest` since this test serializes accesses to the same key and uses a file to cross-check data correctness. The timestamp feature is not supported in a number of components, e.g. Merge, SingleDelete, DeleteRange, CompactionFilter, Readonly instance, secondary instance, SST file ingestion, transaction, etc. Therefore, db_stress should exit if user enables both timestamp and these features at the same time. The (currently) incompatible features can be found in `CheckAndSetOptionsForUserTimestamp`. This PR also fixes a bug triggered when timestamp is enabled together with `index_type=kBinarySearchWithFirstKey`. This bug fix will also be in another separate PR with more unit tests coverage. Fixing it here because I do not want to exclude the index type from crash test. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8061 Test Plan: make crash_test_with_ts Reviewed By: jay-zhuang Differential Revision: D27056282 Pulled By: riversand963 fbshipit-source-id: c3e00ad1023fdb9ebbdf9601ec18270c5e2925a9 |
4 years ago |
|
Andrew Kryczka
|
d904233d2f |
Limit buffering for collecting samples for compression dictionary (#7970)
Summary: For dictionary compression, we need to collect some representative samples of the data to be compressed, which we use to either generate or train (when `CompressionOptions::zstd_max_train_bytes > 0`) a dictionary. Previously, the strategy was to buffer all the data blocks during flush, and up to the target file size during compaction. That strategy allowed us to randomly pick samples from as wide a range as possible that'd be guaranteed to land in a single output file. However, some users try to make huge files in memory-constrained environments, where this strategy can cause OOM. This PR introduces an option, `CompressionOptions::max_dict_buffer_bytes`, that limits how much data blocks are buffered before we switch to unbuffered mode (which means creating the per-SST dictionary, writing out the buffered data, and compressing/writing new blocks as soon as they are built). It is not strict as we currently buffer more than just data blocks -- also keys are buffered. But it does make a step towards giving users predictable memory usage. Related changes include: - Changed sampling for dictionary compression to select unique data blocks when there is limited availability of data blocks - Made use of `BlockBuilder::SwapAndReset()` to save an allocation+memcpy when buffering data blocks for building a dictionary - Changed `ParseBoolean()` to accept an input containing characters after the boolean. This is necessary since, with this PR, a value for `CompressionOptions::enabled` is no longer necessarily the final component in the `CompressionOptions` string. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7970 Test Plan: - updated `CompressionOptions` unit tests to verify limit is respected (to the extent expected in the current implementation) in various scenarios of flush/compaction to bottommost/non-bottommost level - looked at jemalloc heap profiles right before and after switching to unbuffered mode during flush/compaction. Verified memory usage in buffering is proportional to the limit set. Reviewed By: pdillinger Differential Revision: D26467994 Pulled By: ajkr fbshipit-source-id: 3da4ef9fba59974e4ef40e40c01611002c861465 |
4 years ago |
|
Levi Tamasi
|
0288bdbc53 |
Add the integrated BlobDB to the stress/crash tests (#7900)
Summary: The patch adds support for the options related to the new BlobDB implementation to `db_stress`, including support for dynamically adjusting them using `SetOptions` when `set_options_one_in` and a new flag `allow_setting_blob_options_dynamically` are specified. (The latter is used to prevent the options from being enabled when incompatible features are in use.) The patch also updates the `db_stress` help messages of the existing stacked BlobDB related options to clarify that they pertain to the old implementation. In addition, it adds the new BlobDB to the crash test script. In order to prevent a combinatorial explosion of jobs and still perform whitebox/blackbox testing (including under ASAN/TSAN/UBSAN), and to also test BlobDB in conjunction with atomic flush and transactions, the script sets the BlobDB options in 10% of normal/`cf_consistency`/`txn` crash test runs. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7900 Test Plan: Ran `make check` and `db_stress`/`db_crashtest.py` with various options. Reviewed By: jay-zhuang Differential Revision: D26094913 Pulled By: ltamasi fbshipit-source-id: c2ef3391a05e43a9687f24e297df05f4a5584814 |
4 years ago |
|
Andrew Kryczka
|
78ee8564ad |
Integrity protection for live updates to WriteBatch (#7748)
Summary: This PR adds the foundation classes for key-value integrity protection and the first use case: protecting live updates from the source buffers added to `WriteBatch` through the destination buffer in `MemTable`. The width of the protection info is not yet configurable -- only eight bytes per key is supported. This PR allows users to enable protection by constructing `WriteBatch` with `protection_bytes_per_key == 8`. It does not yet expose a way for users to get integrity protection via other write APIs (e.g., `Put()`, `Merge()`, `Delete()`, etc.). The foundation classes (`ProtectionInfo.*`) embed the coverage info in their type, and provide `Protect.*()` and `Strip.*()` functions to navigate between types with different coverage. For making bytes per key configurable (for powers of two up to eight) in the future, these classes are templated on the unsigned integer type used to store the protection info. That integer contains the XOR'd result of hashes with independent seeds for all covered fields. For integer fields, the hash is computed on the raw unadjusted bytes, so the result is endian-dependent. The most significant bytes are truncated when the hash value (8 bytes) is wider than the protection integer. When `WriteBatch` is constructed with `protection_bytes_per_key == 8`, we hold a `ProtectionInfoKVOTC` (i.e., one that covers key, value, optype aka `ValueType`, timestamp, and CF ID) for each entry added to the batch. The protection info is generated from the original buffers passed by the user, as well as the original metadata generated internally. When writing to memtable, each entry is transformed to a `ProtectionInfoKVOTS` (i.e., dropping coverage of CF ID and adding coverage of sequence number), since at that point we know the sequence number, and have already selected a memtable corresponding to a particular CF. This protection info is verified once the entry is encoded in the `MemTable` buffer. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7748 Test Plan: - an integration test to verify a wide variety of single-byte changes to the encoded `MemTable` buffer are caught - add to stress/crash test to verify it works in variety of configs/operations without intentional corruption - [deferred] unit tests for `ProtectionInfo.*` classes for edge cases like KV swap, `SliceParts` and `Slice` APIs are interchangeable, etc. Reviewed By: pdillinger Differential Revision: D25754492 Pulled By: ajkr fbshipit-source-id: e481bac6c03c2ab268be41359730f1ceb9964866 |
4 years ago |
|
Zhichao Cao
|
04b3524ad0 |
Inject the random write error to stress test (#7653)
Summary: Inject the random write error to stress test, it requires set reopen=0 and disable_wal=true. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7653 Test Plan: pass db_stress and python3 db_crashtest.py blackbox Reviewed By: ajkr Differential Revision: D25354132 Pulled By: zhichao-cao fbshipit-source-id: 44721104eecb416e27f65f854912c40e301dd669 |
4 years ago |
|
Peter Dillinger
|
60af964372 |
Experimental (production candidate) SST schema for Ribbon filter (#7658)
Summary:
Added experimental public API for Ribbon filter:
NewExperimentalRibbonFilterPolicy(). This experimental API will
take a "Bloom equivalent" bits per key, and configure the Ribbon
filter for the same FP rate as Bloom would have but ~30% space
savings. (Note: optimize_filters_for_memory is not yet implemented
for Ribbon filter. That can be added with no effect on schema.)
Internally, the Ribbon filter is configured using a "one_in_fp_rate"
value, which is 1 over desired FP rate. For example, use 100 for 1%
FP rate. I'm expecting this will be used in the future for configuring
Bloom-like filters, as I expect people to more commonly hold constant
the filter accuracy and change the space vs. time trade-off, rather than
hold constant the space (per key) and change the accuracy vs. time
trade-off, though we might make that available.
### Benchmarking
```
$ ./filter_bench -impl=2 -quick -m_keys_total_max=200 -average_keys_per_filter=100000 -net_includes_hashing
Building...
Build avg ns/key: 34.1341
Number of filters: 1993
Total size (MB): 238.488
Reported total allocated memory (MB): 262.875
Reported internal fragmentation: 10.2255%
Bits/key stored: 10.0029
----------------------------
Mixed inside/outside queries...
Single filter net ns/op: 18.7508
Random filter net ns/op: 258.246
Average FP rate %: 0.968672
----------------------------
Done. (For more info, run with -legend or -help.)
$ ./filter_bench -impl=3 -quick -m_keys_total_max=200 -average_keys_per_filter=100000 -net_includes_hashing
Building...
Build avg ns/key: 130.851
Number of filters: 1993
Total size (MB): 168.166
Reported total allocated memory (MB): 183.211
Reported internal fragmentation: 8.94626%
Bits/key stored: 7.05341
----------------------------
Mixed inside/outside queries...
Single filter net ns/op: 58.4523
Random filter net ns/op: 363.717
Average FP rate %: 0.952978
----------------------------
Done. (For more info, run with -legend or -help.)
```
168.166 / 238.488 = 0.705 -> 29.5% space reduction
130.851 / 34.1341 = 3.83x construction time for this Ribbon filter vs. lastest Bloom filter (could make that as little as about 2.5x for less space reduction)
### Working around a hashing "flaw"
bloom_test discovered a flaw in the simple hashing applied in
StandardHasher when num_starts == 1 (num_slots == 128), showing an
excessively high FP rate. The problem is that when many entries, on the
order of number of hash bits or kCoeffBits, are associated with the same
start location, the correlation between the CoeffRow and ResultRow (for
efficiency) can lead to a solution that is "universal," or nearly so, for
entries mapping to that start location. (Normally, variance in start
location breaks the effective association between CoeffRow and
ResultRow; the same value for CoeffRow is effectively different if start
locations are different.) Without kUseSmash and with num_starts > 1 (thus
num_starts ~= num_slots), this flaw should be completely irrelevant. Even
with 10M slots, the chances of a single slot having just 16 (or more)
entries map to it--not enough to cause an FP problem, which would be local
to that slot if it happened--is 1 in millions. This spreadsheet formula
shows that: =1/(10000000*(1 - POISSON(15, 1, TRUE)))
As kUseSmash==false (the setting for Standard128RibbonBitsBuilder) is
intended for CPU efficiency of filters with many more entries/slots than
kCoeffBits, a very reasonable work-around is to disallow num_starts==1
when !kUseSmash, by making the minimum non-zero number of slots
2*kCoeffBits. This is the work-around I've applied. This also means that
the new Ribbon filter schema (Standard128RibbonBitsBuilder) is not
space-efficient for less than a few hundred entries. Because of this, I
have made it fall back on constructing a Bloom filter, under existing
schema, when that is more space efficient for small filters. (We can
change this in the future if we want.)
TODO: better unit tests for this case in ribbon_test, and probably
update StandardHasher for kUseSmash case so that it can scale nicely to
small filters.
### Other related changes
* Add Ribbon filter to stress/crash test
* Add Ribbon filter to filter_bench as -impl=3
* Add option string support, as in "filter_policy=experimental_ribbon:5.678;"
where 5.678 is the Bloom equivalent bits per key.
* Rename internal mode BloomFilterPolicy::kAuto to kAutoBloom
* Add a general BuiltinFilterBitsBuilder::CalculateNumEntry based on
binary searching CalculateSpace (inefficient), so that subclasses
(especially experimental ones) don't have to provide an efficient
implementation inverting CalculateSpace.
* Minor refactor FastLocalBloomBitsBuilder for new base class
XXH3pFilterBitsBuilder shared with new Standard128RibbonBitsBuilder,
which allows the latter to fall back on Bloom construction in some
extreme cases.
* Mostly updated bloom_test for Ribbon filter, though a test like
FullBloomTest::Schema is a next TODO to ensure schema stability
(in case this becomes production-ready schema as it is).
* Add some APIs to ribbon_impl.h for configuring Ribbon filters.
Although these are reasonably covered by bloom_test, TODO more unit
tests in ribbon_test
* Added a "tool" FindOccupancyForSuccessRate to ribbon_test to get data
for constructing the linear approximations in GetNumSlotsFor95PctSuccess.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7658
Test Plan:
Some unit tests updated but other testing is left TODO. This
is considered experimental but laying down schema compatibility as early
as possible in case it proves production-quality. Also tested in
stress/crash test.
Reviewed By: jay-zhuang
Differential Revision: D24899349
Pulled By: pdillinger
fbshipit-source-id: 9715f3e6371c959d923aea8077c9423c7a9f82b8
|
4 years ago |
|
Andrew Kryczka
|
75d3b6fdf0 |
Redesign block cache pinning API (#7520)
Summary: The old flag-based APIs (`BlockBasedTableOptions::pin_l0_filter_and_index_blocks_in_cache` and `BlockBasedTableOptions::pin_top_level_index_and_filter`) were insufficient for our needs. For example, it was impossible to pin only unpartitioned meta-blocks, which could prevent block cache contention when turning on dictionary compression or during a migration to partitioned indexes/filters. It was also impossible to pin all meta-blocks in memory while having predictable memory usage via block cache. If we had continued adding flags to address these scenarios, they would have had significant overlap causing confusion. Instead, this PR deprecates the flags and starts a new API with non-overlapping options. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7520 Test Plan: - new unit test - added new options to stress/crash test and ran for a while: `$ python tools/db_crashtest.py blackbox --simple --max_key=1000000 -write_buffer_size=1048576 -target_file_size_base=1048576 -max_bytes_for_level_base=4194304 --interval=10 -value_size_mult=33 -column_families=1 -reopen=0` Reviewed By: pdillinger Differential Revision: D24200034 Pulled By: ajkr fbshipit-source-id: 3fa7cfc71e7960f7a867511dd6ae5834dd73b13e |
4 years ago |
|
sdong
|
aedcaaef99 |
Stress test to support paranoid_file_checks (#7473)
Summary: It's important to make sure no false positive is reported when options.paranoid_file_checks is used. Add it to stress test and a place holder in crash test. It is disabled in crash test as there appears to be a bug causing false positive. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7473 Test Plan: Run crash test Reviewed By: ajkr Differential Revision: D24026939 fbshipit-source-id: 89102acb45cf041776775ce44a4eef4b0f3a380c |
4 years ago |
|
Peter Dillinger
|
06ad5dd293 |
Add file checksum to stress/crash test (#7343)
Summary: This change has the crash test randomly select from a few file checksum implementations, or nullptr, for DB file_checksum_gen_factory. For compatibility across runs on same DB, each non-null factory can understand all the other functions, but the default changes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7343 Test Plan: 'make blackbox_crash_test' for a while, including with some debug output to ensure code is being exercised. Reviewed By: zhichao-cao Differential Revision: D23494580 Pulled By: pdillinger fbshipit-source-id: 73bbc7ca32c1adaf619134c0c830f12894880b8a |
4 years ago |
|
Peter Dillinger
|
499c9448d0 |
Fix, enable, and enhance backup/restore in db_stress (#7348)
Summary: Although added to db_stress, testing of backup/restore was never integrated into the crash test, originally concerned about performance. I've enabled it now and to address the peformance concern, testing backup/restore is always skipped once the db exceeds a certain size threshold, default 100MB. This should provide sufficient opportunity for testing BackupEngine without bogging down everything else with heavier and heavier operations. Also fixed backup/restore in db_stress by making sure PurgeOldBackups can remove manifest files, which are normally kept around for db_stress. Added more coverage of backup options, and up to three backups being saved in one backup directory (in some cases). Pull Request resolved: https://github.com/facebook/rocksdb/pull/7348 Test Plan: ran 'make blackbox_crash_test' for a while, with heightened probabilitly of taking backups (1/10k). Also confirmed with some debug output that the code is being covered, TestBackupRestore only takes a few seconds to complete when triggered, and even at 1/10k and ~50MB database, there's <,~ 1 thread testing backups at any time. Reviewed By: ajkr Differential Revision: D23510835 Pulled By: pdillinger fbshipit-source-id: b6b8735591808141f81f10773ac31634cf03b6c0 |
4 years ago |
|
Hans Holmberg
|
2a0d3c7054 |
Add a file system parameter: --fs_uri to db_stress and db_bench (#6878)
Summary: This pull request adds the parameter --fs_uri to db_bench and db_stress, creating a composite env combining the default env with a specified registered rocksdb file system. This makes it easier to develop and test new RocksDB FileSystems. The pull request also registers the posix file system for testing purposes. Examples: ``` $./db_bench --fs_uri=posix:// --benchmarks=fillseq $./db_stress --fs_uri=zenfs://nullb1 ``` zenfs is a RocksDB FileSystem I'm developing to add support for zoned block devices, and in that case the zoned block device is specified in the uri (a zoned null block device in the above example). Pull Request resolved: https://github.com/facebook/rocksdb/pull/6878 Reviewed By: siying Differential Revision: D23023063 Pulled By: ajkr fbshipit-source-id: 8b3fe7193ce45e683043b021779b7a4d547af247 |
4 years ago |
|
Andrew Kryczka
|
7eebe6d38a |
Mark files for compaction in stress/crash tests (#7231)
Summary: The mechanism to mark files for compaction is most commonly used in delete-triggered compaction. This PR adds an option to exercise the marking mechanism on random files created by db_stress. This PR also enables that option in db_crashtest.py on its db_stress runs at random. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7231 Test Plan: - ran some minified crash tests; verified they succeed and we see `"compaction_reason": "FilesMarkedForCompaction"` regularly in the logs. ``` $ TEST_TMPDIR=/dev/shm python tools/db_crashtest.py blackbox --duration=600 --interval=30 --max_key=10000000 --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --value_size_mult=33 $ TEST_TMPDIR=/dev/shm python tools/db_crashtest.py whitebox --duration=600 --interval=30 --max_key=1000000 --write_buffer_size=1048576 --target_file_size_base=1048576 --max_bytes_for_level_base=4194304 --value_size_mult=33 --random_kill_odd=8887 ``` Reviewed By: anand1976 Differential Revision: D23025156 Pulled By: ajkr fbshipit-source-id: a404c467ebc12afa94dae35956ea9b372f592a96 |
4 years ago |
|
Jay Zhuang
|
fc4d5f5065 |
Add stress test for GetProperty (#7111)
Summary: Add stress test coverage for `DB::GetProperty()`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7111 Test Plan: ``` ./db_stress -get_property_one_in=1 make crash_test ``` Reviewed By: ajkr Differential Revision: D22487906 Pulled By: jay-zhuang fbshipit-source-id: c118d95cc9b4e2fa669a06e6aa531541fa885dc5 |
4 years ago |
|
mrambacher
|
c7c7b07f06 |
More Makefile Cleanup (#7097)
Summary: Cleans up some of the dependencies on test code in the Makefile while building tools: - Moves the test::RandomString, DBBaseTest::RandomString into Random - Moves the test::RandomHumanReadableString into Random - Moves the DestroyDir method into file_utils - Moves the SetupSyncPointsToMockDirectIO into sync_point. - Moves the FaultInjection Env and FS classes under env These changes allow all of the tools to build without dependencies on test_util, thereby simplifying the build dependencies. By moving the FaultInjection code, the dependency in db_stress on different libraries for debug vs release was eliminated. Tested both release and debug builds via Make and CMake for both static and shared libraries. More work remains to clean up how the tools are built and remove some unnecessary dependencies. There is also more work that should be done to get the Makefile and CMake to align in their builds -- what is in the libraries and the sizes of the executables are different. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7097 Reviewed By: riversand963 Differential Revision: D22463160 Pulled By: pdillinger fbshipit-source-id: e19462b53324ab3f0b7c72459dbc73165cc382b2 |
4 years ago |
|
Peter Dillinger
|
5b2bbacb6f |
Minimize memory internal fragmentation for Bloom filters (#6427)
Summary:
New experimental option BBTO::optimize_filters_for_memory builds
filters that maximize their use of "usable size" from malloc_usable_size,
which is also used to compute block cache charges.
Rather than always "rounding up," we track state in the
BloomFilterPolicy object to mix essentially "rounding down" and
"rounding up" so that the average FP rate of all generated filters is
the same as without the option. (YMMV as heavily accessed filters might
be unluckily lower accuracy.)
Thus, the option near-minimizes what the block cache considers as
"memory used" for a given target Bloom filter false positive rate and
Bloom filter implementation. There are no forward or backward
compatibility issues with this change, though it only works on the
format_version=5 Bloom filter.
With Jemalloc, we see about 10% reduction in memory footprint (and block
cache charge) for Bloom filters, but 1-2% increase in storage footprint,
due to encoding efficiency losses (FP rate is non-linear with bits/key).
Why not weighted random round up/down rather than state tracking? By
only requiring malloc_usable_size, we don't actually know what the next
larger and next smaller usable sizes for the allocator are. We pick a
requested size, accept and use whatever usable size it has, and use the
difference to inform our next choice. This allows us to narrow in on the
right balance without tracking/predicting usable sizes.
Why not weight history of generated filter false positive rates by
number of keys? This could lead to excess skew in small filters after
generating a large filter.
Results from filter_bench with jemalloc (irrelevant details omitted):
(normal keys/filter, but high variance)
$ ./filter_bench -quick -impl=2 -average_keys_per_filter=30000 -vary_key_count_ratio=0.9
Build avg ns/key: 29.6278
Number of filters: 5516
Total size (MB): 200.046
Reported total allocated memory (MB): 220.597
Reported internal fragmentation: 10.2732%
Bits/key stored: 10.0097
Average FP rate %: 0.965228
$ ./filter_bench -quick -impl=2 -average_keys_per_filter=30000 -vary_key_count_ratio=0.9 -optimize_filters_for_memory
Build avg ns/key: 30.5104
Number of filters: 5464
Total size (MB): 200.015
Reported total allocated memory (MB): 200.322
Reported internal fragmentation: 0.153709%
Bits/key stored: 10.1011
Average FP rate %: 0.966313
(very few keys / filter, optimization not as effective due to ~59 byte
internal fragmentation in blocked Bloom filter representation)
$ ./filter_bench -quick -impl=2 -average_keys_per_filter=1000 -vary_key_count_ratio=0.9
Build avg ns/key: 29.5649
Number of filters: 162950
Total size (MB): 200.001
Reported total allocated memory (MB): 224.624
Reported internal fragmentation: 12.3117%
Bits/key stored: 10.2951
Average FP rate %: 0.821534
$ ./filter_bench -quick -impl=2 -average_keys_per_filter=1000 -vary_key_count_ratio=0.9 -optimize_filters_for_memory
Build avg ns/key: 31.8057
Number of filters: 159849
Total size (MB): 200
Reported total allocated memory (MB): 208.846
Reported internal fragmentation: 4.42297%
Bits/key stored: 10.4948
Average FP rate %: 0.811006
(high keys/filter)
$ ./filter_bench -quick -impl=2 -average_keys_per_filter=1000000 -vary_key_count_ratio=0.9
Build avg ns/key: 29.7017
Number of filters: 164
Total size (MB): 200.352
Reported total allocated memory (MB): 221.5
Reported internal fragmentation: 10.5552%
Bits/key stored: 10.0003
Average FP rate %: 0.969358
$ ./filter_bench -quick -impl=2 -average_keys_per_filter=1000000 -vary_key_count_ratio=0.9 -optimize_filters_for_memory
Build avg ns/key: 30.7131
Number of filters: 160
Total size (MB): 200.928
Reported total allocated memory (MB): 200.938
Reported internal fragmentation: 0.00448054%
Bits/key stored: 10.1852
Average FP rate %: 0.963387
And from db_bench (block cache) with jemalloc:
$ ./db_bench -db=/dev/shm/dbbench.no_optimize -benchmarks=fillrandom -format_version=5 -value_size=90 -bloom_bits=10 -num=2000000 -threads=8 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=false
$ ./db_bench -db=/dev/shm/dbbench -benchmarks=fillrandom -format_version=5 -value_size=90 -bloom_bits=10 -num=2000000 -threads=8 -optimize_filters_for_memory -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=false
$ (for FILE in /dev/shm/dbbench.no_optimize/*.sst; do ./sst_dump --file=$FILE --show_properties | grep 'filter block' ; done) | awk '{ t += $4; } END { print t; }'
17063835
$ (for FILE in /dev/shm/dbbench/*.sst; do ./sst_dump --file=$FILE --show_properties | grep 'filter block' ; done) | awk '{ t += $4; } END { print t; }'
17430747
$ #^ 2.1% additional filter storage
$ ./db_bench -db=/dev/shm/dbbench.no_optimize -use_existing_db -benchmarks=readrandom,stats -statistics -bloom_bits=10 -num=2000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=false -duration=10 -cache_index_and_filter_blocks -cache_size=1000000000
rocksdb.block.cache.index.add COUNT : 33
rocksdb.block.cache.index.bytes.insert COUNT : 8440400
rocksdb.block.cache.filter.add COUNT : 33
rocksdb.block.cache.filter.bytes.insert COUNT : 21087528
rocksdb.bloom.filter.useful COUNT : 4963889
rocksdb.bloom.filter.full.positive COUNT : 1214081
rocksdb.bloom.filter.full.true.positive COUNT : 1161999
$ #^ 1.04 % observed FP rate
$ ./db_bench -db=/dev/shm/dbbench -use_existing_db -benchmarks=readrandom,stats -statistics -bloom_bits=10 -num=2000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=false -optimize_filters_for_memory -duration=10 -cache_index_and_filter_blocks -cache_size=1000000000
rocksdb.block.cache.index.add COUNT : 33
rocksdb.block.cache.index.bytes.insert COUNT : 8448592
rocksdb.block.cache.filter.add COUNT : 33
rocksdb.block.cache.filter.bytes.insert COUNT : 18220328
rocksdb.bloom.filter.useful COUNT : 5360933
rocksdb.bloom.filter.full.positive COUNT : 1321315
rocksdb.bloom.filter.full.true.positive COUNT : 1262999
$ #^ 1.08 % observed FP rate, 13.6% less memory usage for filters
(Due to specific key density, this example tends to generate filters that are "worse than average" for internal fragmentation. "Better than average" cases can show little or no improvement.)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6427
Test Plan: unit test added, 'make check' with gcc, clang and valgrind
Reviewed By: siying
Differential Revision: D22124374
Pulled By: pdillinger
fbshipit-source-id: f3e3aa152f9043ddf4fae25799e76341d0d8714e
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4 years ago |
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Andrew Kryczka
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d76eed4839 |
minor fixes for stress/crash contruns (#7006)
Summary: Avoid using `cf_consistency` together with `enable_compaction_filter` as the former heavily uses snapshots while the latter is incompatible with snapshots. Also fix a clang-analyze error for a write to a variable that is never read. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7006 Reviewed By: zhichao-cao Differential Revision: D22141679 Pulled By: ajkr fbshipit-source-id: 1840ae238168818a9ab5973f90fd78c067399447 |
4 years ago |