5f025ea832
Summary: This is groundwork for adding garbage collection support to BlobDB. The patch adds logic that keeps track of the oldest blob file referred to by each SST file. The oldest blob file is identified during flush/ compaction (similarly to how the range of keys covered by the SST is identified), and persisted in the manifest as a custom field of the new file edit record. Blob indexes with TTL are ignored for the purposes of identifying the oldest blob file (since such blob files are cleaned up by the TTL logic in BlobDB). Pull Request resolved: https://github.com/facebook/rocksdb/pull/5903 Test Plan: Added new unit tests; also ran db_bench in BlobDB mode, inspected the manifest using ldb, and confirmed (by scanning the SST files using sst_dump) that the value of the oldest blob file number field matches the contents of the file for each SST. Differential Revision: D17859997 Pulled By: ltamasi fbshipit-source-id: 21662c137c6259a6af70446faaf3a9912c550e90
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.