107e08baa7
Summary: We decided that one of the long term goals is to unify level and universal compaction. As a small first step, I'm unifying level 0 sorting methods. Previously, we used to sort level 0 files in level compaction by file number and in universal compaction by sequence number. But it turns out that in level compaction, sorting by file number is exactly the same as sorting by sequence number. Test Plan: Ran make check with bunch of asserts to verify the sorting order is exactly the same. Also, make check with this patch Reviewers: haobo, yhchiang, ljin, dhruba, sdong Reviewed By: sdong Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D19131
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 an 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/