95f6add746
Summary: This partially reverts commit 10196d7edc2fc5c03553c76acaf1337b5c7c1718. The problem with this change is because of important filter use cases: FIFO compaction and SST writer. FIFO "compaction" always uses level 0 so would only use Ribbon filters if specifically including level 0 for the Ribbon filter policy. SST writer sets level_at_creation=-1 to indicate unknown level, and this would be treated the same as level 0 unless fixed. We are keeping the part about committing to permanent schema, which is only changes to API comments and HISTORY.md. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8212 Test Plan: CI Reviewed By: jay-zhuang Differential Revision: D27896468 Pulled By: pdillinger fbshipit-source-id: 50a775f7cba5d64fb729d9b982e355864020596e
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/ and https://rocksdb.slack.com/
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.