Revision 58b12dfe37784ce1bd67a03643147ab94f590451 authored by Reid Horuff on 06 March 2017, 23:04:36 UTC, committed by Facebook Github Bot on 06 March 2017, 23:09:11 UTC
Summary: Relating to #1903: In MaybeFlushColumnFamilies() we want to modify the 'getting_flushed' flag before releasing the db mutex when SwitchMemtable() is called. The following 2 actions need to be atomic in MaybeFlushColumnFamilies() - getting_flushed is false on oldest log - we determine that all CFs can be flushed to successfully release oldest log - we set getting_flushed = true on the oldest log. ------- - getting_flushed is false on oldest log - we determine that all CFs can NOT be flushed to successfully release oldest log - we set unable_to_flush_oldest_log_ = true on the oldest log. #### In the 2pc case: T1 enters function but is unable to flush all CFs to release log T1 sets unable_to_flush_oldest_log_ = true T1 begins flushing all CFs possible T2 enters function but is unable to flush all CFs to release log T2 sees unable_to_flush_oldes_log_ has been set so exits T3 enters function and will be able to flush all CFs to release oldest log T3 sets getting_flushed = true on oldes Closes https://github.com/facebook/rocksdb/pull/1909 Differential Revision: D4646235 Pulled By: reidHoruff fbshipit-source-id: c8d0447
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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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