6eafdf135a
Summary: min_log_number_to_keep denotes that the WALs whose numbers are below this value **will** be deleted by RocksDB. delete_wals_before will be used by RocksDB if track_and_verify_wals_in_manifest is set to true. During recovery, RocksDB uses the info encoded in delete_wals_before to reconstruct its knowledge about what WALs to expect existing. If these two tags are not encoded in the same VersionEdit, then it's possible for min_log_number_to_keep=100 to exist, but delete_wals_before=100 to be lost due to power failure. Subsequent recovery will delete 99.log. If the db crashes again, the following recovery will expect to see 99.log since there is no delete_wals_before=100 in the MANIFEST, but the WAL is already deleted. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9766 Test Plan: First of all, make check. Second, format compatibility. SHORT_TEST=1 ./tools/check_format_compatible.sh Reviewed By: ltamasi Differential Revision: D35203623 Pulled By: riversand963 fbshipit-source-id: 45623fc4b4b50d299d5e0f9559a3a4c5e9522c8f
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/main/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.
Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.
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.