e12753eb71
Summary: Track each SST's timestamp information as user properties https://github.com/facebook/rocksdb/issues/8959 Rockdb has supported user-defined timestamp feature. Application can specify a timestamp when writing each k-v pair. When data flush from memory to disk file called SST files. Each SST files consist of multiple data blocks and several metadata blocks. Among the metadata blocks, there is one called Properties block that tracks some pre-defined properties of this SST file. This PR is for collecting the properties of min and max timestamps of all keys in the file. With those properties the SST file is more convenient to tell whether the keys in the SST have timestamps or not. The changes involved are as follows: 1) Add a class TimestampTablePropertiesCollector to collect min/max timestamp when add keys to table, The way TimestampTablePropertiesCollector use to compare timestamp of key should defined by user by implementing the Comparator::CompareTimestamp function in the user defined comparator. 2) Add corresponding unit tests. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9093 Reviewed By: ltamasi Differential Revision: D32406927 Pulled By: riversand963 fbshipit-source-id: 25922971b7e67bacf4d53a1fb67c4c5ddaa61573 |
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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.
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.