Revision d525718a93485ef5c8e9b835d2c81df2d2fd8ba1 authored by Aaron Gao on 15 March 2017, 05:23:21 UTC, committed by Facebook Github Bot on 15 March 2017, 05:39:09 UTC
Summary: remove unnecessary field `direct_io_`, use `use_direct_io()` instead. Closes https://github.com/facebook/rocksdb/pull/1992 Differential Revision: D4712195 Pulled By: lightmark fbshipit-source-id: 57d34f9
1 parent 5fa927a
DEFAULT_OPTIONS_HISTORY.md
# RocksDB default options change log
## Unreleased
* Change the default of delayed slowdown value to 16MB/s and further increase the L0 stop condition to 36 files.
## 5.0 (11/17/2016)
* Options::allow_concurrent_memtable_write and Options::enable_write_thread_adaptive_yield are now true by default
* Options.level0_stop_writes_trigger default value changes from 24 to 32.
## 4.8.0 (5/2/2016)
* 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.
* 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.
* 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.
## 4.7.0 (4/8/2016)
* options.write_buffer_size changes from 4MB to 64MB.
* options.target_file_size_base changes from 2MB to 64MB.
* options.max_bytes_for_level_base changes from 10MB to 256MB.
* options.soft_pending_compaction_bytes_limit changes from 0 (disabled) to 64GB.
* options.hard_pending_compaction_bytes_limit changes from 0 (disabled) to 256GB.
* table_cache_numshardbits changes from 4 to 6.
* max_file_opening_threads changes from 1 to 16.
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