5576ded762
Summary: In response to https://github.com/facebook/rocksdb/issues/9354, this PR adds a way for users to "opt out" of extra checks that can impact peak write performance, which currently only includes force_consistency_checks. I considered including some other options but did not see a db_bench performance difference. Also clarify in comment for force_consistency_checks that it can "slow down saturated writing." Pull Request resolved: https://github.com/facebook/rocksdb/pull/9363 Test Plan: basic coverage in unit tests Using my perf test in https://github.com/facebook/rocksdb/issues/9354 comment, I see force_consistency_checks=true -> 725360 ops/s force_consistency_checks=false -> 783072 ops/s Reviewed By: mrambacher Differential Revision: D33636559 Pulled By: pdillinger fbshipit-source-id: 25bfd006f4844675e7669b342817dd4c6a641e84
25 lines
1.5 KiB
Markdown
25 lines
1.5 KiB
Markdown
# RocksDB default options change log (NO LONGER MAINTAINED)
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## Unreleased
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* delayed_write_rate takes the rate given by rate_limiter if not specified.
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## 5.2
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* Change the default of delayed slowdown value to 16MB/s and further increase the L0 stop condition to 36 files.
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## 5.0 (11/17/2016)
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* Options::allow_concurrent_memtable_write and Options::enable_write_thread_adaptive_yield are now true by default
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* Options.level0_stop_writes_trigger default value changes from 24 to 32.
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## 4.8.0 (5/2/2016)
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* options.max_open_files changes from 5000 to -1. It improves performance, but users need to set file descriptor limit to be large enough and watch memory usage for index and bloom filters.
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* options.base_background_compactions changes from max_background_compactions to 1. When users set higher max_background_compactions but the write throughput is not high, the writes are less spiky to disks.
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* options.wal_recovery_mode changes from kTolerateCorruptedTailRecords to kPointInTimeRecovery. Avoid some false positive when file system or hardware reorder the writes for file data and metadata.
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## 4.7.0 (4/8/2016)
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* options.write_buffer_size changes from 4MB to 64MB.
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* options.target_file_size_base changes from 2MB to 64MB.
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* options.max_bytes_for_level_base changes from 10MB to 256MB.
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* options.soft_pending_compaction_bytes_limit changes from 0 (disabled) to 64GB.
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* options.hard_pending_compaction_bytes_limit changes from 0 (disabled) to 256GB.
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* table_cache_numshardbits changes from 4 to 6.
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* max_file_opening_threads changes from 1 to 16.
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