da9274574f
Summary: Modify a functioin TrimAppend in dbformat.h: IterKey. Write a test for it in dbformat_test Use IterKey in block::Iter to replace std::string to reduce malloc. Evaluate it using perf record. malloc: 4.26% -> 2.91% free: 3.61% -> 3.08% Test Plan: make all check ./valgrind db_test dbformat_test Reviewers: ljin, haobo, yhchiang, dhruba, igor, sdong Reviewed By: sdong Differential Revision: https://reviews.facebook.net/D20433
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 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/