7177dc46a1
Summary: In secondary mode, it is possible that the secondary lists the primary's WAL directory, finds a WAL and tries to open it. It is possible that the primary deletes the WAL after secondary listing dir but before the secondary opening it. Then the secondary will fail to open the WAL file with a PathNotFound status. In this case, we can return OK without replaying WAL and optionally replay more MANIFEST. Test Plan (on my dev machine): Without this PR, the following will fail several times out of 100 runs. ``` ~/gtest-parallel/gtest-parallel -r 100 -w 16 ./db_secondary_test --gtest_filter=DBSecondaryTest.SwitchToNewManifestDuringOpen ``` With this PR, the above should always succeed. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5323 Differential Revision: D15763878 Pulled By: riversand963 fbshipit-source-id: c7164fa7cb8d9001abc258b6a2dc93613e4f38ff
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/
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.