284aa613a7
Summary: Before this diff, there were duplicated constants to refer to properties (user- facing API had strings and InternalStats had an enum). I noticed these were inconsistent in terms of which constants are provided, names of constants, and documentation of constants. Overall it seemed annoying/error-prone to maintain these duplicated constants. So, this diff gets rid of InternalStats's constants and replaces them with a map keyed on the user-facing constant. The value in that map contains a function pointer to get the property value, so we don't need to do string matching while holding db->mutex_. This approach has a side benefit of making many small handler functions rather than a giant switch-statement. Test Plan: db_properties_test passes, running "make commit-prereq -j32" Reviewers: sdong, yhchiang, kradhakrishnan, IslamAbdelRahman, rven, anthony Reviewed By: anthony Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D53253
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/