f0bf3bf34b
Summary: CachableEntry is used in a variety of contexts: it may refer to a cached object (i.e. an object in the block cache), an owned object, or an unowned object; also, in some cases (most notably with iterators), the responsibility of managing the pointed-to object gets handed off to another object. Each of the above scenarios have different implications for the lifecycle of the referenced object. For the most part, the patch does not change the lifecycle of managed objects; however, it makes these relationships explicit, and it also enables us to eliminate some hacks and accident-prone code around releasing cache handles and deleting/cleaning up objects. (The only places where the patch changes how an objects are managed are the partitions of partitioned indexes and filters.) Pull Request resolved: https://github.com/facebook/rocksdb/pull/5252 Differential Revision: D15101358 Pulled By: ltamasi fbshipit-source-id: 9eb59e9ae5a7230e3345789762d0ba1f189485be
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 specially 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.