1b4be4cac9
Summary: BlobDB keeps track of the mapping between SSTs and blob files using the `OnFlushCompleted` and `OnCompactionCompleted` callbacks of the `EventListener` interface: upon receiving a flush notification, a link is added between the newly flushed SST and the corresponding blob file; for compactions, links are removed for the inputs and added for the outputs. The earlier code performed this link deletion and addition even for trivially moved files; the new code walks through the two lists together (in a fashion that's similar to merge sort) and skips such files. This should mitigate https://github.com/facebook/rocksdb/issues/6338, wherein an assertion is triggered with the earlier code when a compaction notification for a trivial move precedes the flush notification for the moved SST. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6381 Test Plan: make check Differential Revision: D19773729 Pulled By: ltamasi fbshipit-source-id: ae0f273ded061110dd9334e8fb99b0d7786650b0
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/
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.