14d0bfa429
Summary: UpdateAccumulatedStats() is used to optimize compaction decision esp. when the number of deletion entries are high, but this function can slowdown DBOpen esp. in disk environment. This patch adds DBOptions::skip_sats_update_on_db_open, which skips UpdateAccumulatedStats() in DB::Open() time when it's set to true. Test Plan: Add DBCompactionTest.SkipStatsUpdateTest Reviewers: igor, anthony, IslamAbdelRahman, sdong Reviewed By: sdong Subscribers: tnovak, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D42843
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/