69ec8356b2
Summary: The default IO priority of WritableFiles is IO_TOTAL, meaning that they will bypass the rate limiter if it's passed in the options. This change allows to pass an io priority in construction, so that by setting IO_LOW or IO_HIGH the rate limit will be honored. It also fixes a minor bug: SstFileWriter's copy and move constructor are not disabled and incorrect, as any copy/move will result in a double free. Switching to unique_ptr makes the object correctly movable and non-copyable as expected. Also fix minor style inconsistencies. Closes https://github.com/facebook/rocksdb/pull/2335 Differential Revision: D5113260 Pulled By: sagar0 fbshipit-source-id: e084236e7ff0b50a56cbeceaa9fedd5e210bf9f8
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/