c9042db619
Summary: Range Locking supports Lock Escalation. Lock Escalation is invoked when lock memory is nearly exhausted and it reduced the amount of memory used by joining adjacent locks. Bridging the gap between certain locks has adverse effects. For example, in MyRocks it is not a good idea to bridge the gap between locks in different indexes, as that get the lock to cover large portions of indexes, or even entire indexes. Resolve this by introducing Escalation Barrier. The escalation process will call the user-provided barrier callback function: bool(const Endpoint& a, const Endpoint& b) If the function returns true, there's a barrier between a and b and Lock Escalation will not try to bridge the gap between a and b. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9290 Reviewed By: akankshamahajan15 Differential Revision: D33486753 Pulled By: riversand963 fbshipit-source-id: f97910b67aba0579ea1d35f523ca6863d3dd018e
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 especially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/main/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/ and https://rocksdb.slack.com/
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.