41cbb72749
Summary: It's hard for RocksDB to come up with a good default of delayed write rate. Use rate given by rate limiter if it is availalbe. This provides the I/O order of magnitude. Closes https://github.com/facebook/rocksdb/pull/2357 Differential Revision: D5115324 Pulled By: siying fbshipit-source-id: 341065ad2211c981fc804011c0f0e59a50c7e754
25 lines
1.5 KiB
Markdown
25 lines
1.5 KiB
Markdown
# RocksDB default options change log
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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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