824e646341
Summary: There are some cases when flachcache file descriptor was already allocated (i.e. fb-MySQL). Then NewFlashcacheAwareEnv returns an error at open() because fd was already assigned. This diff adds another function to instantiate FlashcacheAwareEnv, with pre-allocated fd cachedev_fd. Test Plan: Tested with MyRocks using this function, then worked Reviewers: sdong, igor Reviewed By: igor Subscribers: dhruba, MarkCallaghan, rven Differential Revision: https://reviews.facebook.net/D36447
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/