c696f27432
Summary: During recovery, RocksDB performs a kind of dummy flush; namely, entries from the WAL are added to memtables, which then get written to SSTs and blob files (if enabled) just like during a regular flush. Note that multiple memtables might be flushed during recovery for the same column family, for example, if the DB is reopened with a lower write buffer size, and therefore, we need to make sure to collect all SST and blob file additions. The patch fixes a bug in the earlier logic which resulted in later blob file additions overwriting earlier ones. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7903 Test Plan: Added a unit test and ran `db_stress`. Reviewed By: jay-zhuang Differential Revision: D26110847 Pulled By: ltamasi fbshipit-source-id: eddb50a608a88f54f3cec3a423de8235aba951fd
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 especially 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/ and https://rocksdb.slack.com/
License
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.