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akankshamahajan 2022-05-02 10:41:12 -07:00
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### New Features
* DB::GetLiveFilesStorageInfo is ready for production use.
* Add new stats PREFETCHED_BYTES_DISCARDED which records number of prefetched bytes discarded by RocksDB FilePrefetchBuffer on destruction and POLL_WAIT_MICROS records wait time for FS::Poll API completion.
* Add new API GetUnixTime in Snapshot class which returns the unix time at which Snapshot is taken.
### Public API changes
* Add rollback_deletion_type_callback to TransactionDBOptions so that write-prepared transactions know whether to issue a Delete or SingleDelete to cancel a previous key written during prior prepare phase. The PR aims to prevent mixing SingleDeletes and Deletes for the same key that can lead to undefined behaviors for write-prepared transactions.
* EXPERIMENTAL: Add new API AbortIO in file_system to abort the read requests submitted asynchronously.
* Add new API GetUnixTime in Snapshot class which returns the unix time at which Snapshot is taken.
### Bug Fixes
* RocksDB calls FileSystem::Poll API during FilePrefetchBuffer destruction which impacts performance as it waits for read requets completion which is not needed anymore. Calling FileSystem::AbortIO to abort those requests instead fixes that performance issue.