9196e80b15
Summary: This PR addresses the following heavy hitters in `Get` operation by moving calls to `StatisticsImpl::recordTick` from `BlockBasedTable` to `Version::Get` - rocksdb.block.cache.bytes.write - rocksdb.block.cache.add - rocksdb.block.cache.data.miss - rocksdb.block.cache.data.bytes.insert - rocksdb.block.cache.data.add - rocksdb.block.cache.hit - rocksdb.block.cache.data.hit - rocksdb.block.cache.bytes.read The db_bench statistics before and after the change are: |1GB block read|Children |Self |Command |Shared Object |Symbol| |---|---|---|---|---|---| |master: |4.22% |1.31% |db_bench |db_bench |[.] rocksdb::StatisticsImpl::recordTick| |updated: |0.51% |0.21% |db_bench |db_bench |[.] rocksdb::StatisticsImpl::recordTick| | |0.14% |0.14% |db_bench |db_bench |[.] rocksdb::GetContext::record_counters| |1MB block read|Children |Self |Command |Shared Object |Symbol| |---|---|---|---|---|---| |master: |3.48% |1.08% |db_bench |db_bench |[.] rocksdb::StatisticsImpl::recordTick| |updated: |0.80% |0.31% |db_bench |db_bench |[.] rocksdb::StatisticsImpl::recordTick| | |0.35% |0.35% |db_bench |db_bench |[.] rocksdb::GetContext::record_counters| Closes https://github.com/facebook/rocksdb/pull/3172 Differential Revision: D6330532 Pulled By: miasantreble fbshipit-source-id: 2b492959e00a3db29e9437ecdcc5e48ca4ec5741
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/