ef535039f3
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/13105 The `WriteBatchWithIndex::NewIteratorWithBase` interface enables creating a `BaseDeltaIterator` with an arbitrary base iterator passed in by the client, which has potentially been created with the `allow_unprepared_value` read option set. Because of this, `BaseDeltaIterator` has to call `PrepareValue` before using the `value()` or `columns()` from the base iterator. This includes both the case when `BaseDeltaIterator` exposes the `value()` and `columns()` of the base iterator as is and the case when the final `value()` / `columns()` is a result of merging key-values across the base and delta iterators. Note that `BaseDeltaIterator` itself does not support `allow_unprepared_value` yet; this will be implemented in an upcoming patch. Reviewed By: jowlyzhang Differential Revision: D65249643 fbshipit-source-id: b0a1ccc0dfd31105b2eef167b463ed15a8bb83b7 |
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README.md
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/main/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.
Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.
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.