9d6f48ec1d
Summary: The patch cleans up and refactors `CompressBlock` and `CompressBlockInternal` a bit. In particular, it does the following: * It renames `CompressBlockInternal` to `CompressData` and moves it to `util/compression.h`, where other general compression-related utilities are located. This will facilitate reuse in the BlobDB write path. * The signature of the method is changed so it now takes `compression_format_version` (similarly to the compression library specific methods) instead of `format_version` (which is specific to the block based table). * `GetCompressionFormatForVersion` no longer takes `compression_type` as a parameter. This parameter was only used in a (not entirely up-to-date) assertion; also, removing it eliminates the need to ensure this precondition holds at all call sites. * Does some minor cleanup in `CompressBlock`, for instance, it is now possible to pass only one of `sampled_output_fast` and `sampled_output_slow`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7249 Test Plan: `make check` Reviewed By: riversand963 Differential Revision: D23087278 Pulled By: ltamasi fbshipit-source-id: e6316e45baed8b4e7de7c1780c90501c2a3439b3
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.