250a51a3f9
Summary: Refactor BlobDB open logic. List of changes: Major: * On reopen, mark blob files found as immutable, do not use them for writing new keys. * Not to scan the whole file to find file footer. Instead just seek to the end of the file and try to read footer. Minor: * Move most of the real logic from blob_db.cc to blob_db_impl.cc. * Not to hold shared_ptr of event listeners in global maps in blob_db.cc * Some changes to BlobFile interface. * Improve logging and error handling. Closes https://github.com/facebook/rocksdb/pull/3246 Differential Revision: D6526147 Pulled By: yiwu-arbug fbshipit-source-id: 9dc4cdd63359a2f9b696af817086949da8d06952
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/