a291f3a1e5
Summary: In order to better understand compaction done by different priority thread pool, we now collect compaction stats by priority and also print them to info LOG through stats dump. ``` ** Compaction Stats [default] ** Priority Files Size Score Read(GB) Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Low 0/0 0.00 KB 0.0 16.8 11.3 5.5 5.6 0.1 0.0 0.0 406.4 136.1 42.24 34.96 45 0.939 13M 8865K High 0/0 0.00 KB 0.0 0.0 0.0 0.0 11.4 11.4 0.0 0.0 0.0 76.2 153.00 35.74 12185 0.013 0 0 ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/5050 Differential Revision: D14408583 Pulled By: miasantreble fbshipit-source-id: e53746586ea27cb8abc9fec35805bd80ed30f608
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it specially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/
License
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.