9b53f14a35
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9060 RocksDB bottommost level compaction may zero out an internal key's sequence if the key's sequence is in the earliest_snapshot. In write-prepared transaction, checking the visibility of a certain sequence in a specific released snapshot may return a "snapshot released" result. Therefore, it is possible, after a certain sequence of events, a PUT has its sequence zeroed out, but a subsequent SingleDelete of the same key will still be output with its original sequence. This violates the ascending order of keys and leads to incorrect result. The solution is to use an extra variable `last_key_seq_zeroed_` to track the information about visibility in earliest snapshot. With this variable, we can know for sure that a SingleDelete is in the earliest snapshot even if the said snapshot is released during compaction before processing the SD. Reviewed By: ltamasi Differential Revision: D31813016 fbshipit-source-id: d8cff59d6f34e0bdf282614034aaea99be9174e1 |
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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.