21f8a57f2a
Summary: TSAN reported data race on count variables in MemPurgeBasic test. This suggests the test could fail if mempurges were slow enough that they don't complete before the count variables being checked, but injecting a long sleep into MemPurge (outside DB mutex) confirms that blocked writes ensure enough mempurges/flushes happen to make the test pass. All the possible different values on testing should be OK to make the test pass. So this change makes the variables atomic so that up-to-date value is always read and TSAN report suppressed. I have also used `.exchange(0)` to make the checking less stateful by "popping off" all the accumulated counts. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9115 Test Plan: updated test, watch for any flakiness Reviewed By: riversand963 Differential Revision: D32114432 Pulled By: pdillinger fbshipit-source-id: c985609d39896a0d8f69ebc87b221e688609bdd8
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.