303cb23a0f
Summary: The patch adds a resource management/RAII class called `ThreadGuard`, which can be used to ensure that the managed thread is joined when the `ThreadGuard` is destroyed, regardless of whether it is due to the object going out of scope, an early return, an exception etc. This is important because if an `std::thread` object is destroyed without having been joined (or detached) first, the process is aborted (via `std::terminate`). For now, `ThreadGuard` is only used in the test case `ExternalSSTFileTest.PickedLevelBug`; however, it could come in handy elsewhere in the codebase as well (both in test code and "real" code). Case in point: in the `PickedLevelBug` test case, with the earlier code we could end up in the above situation when the following assertion (which is before the threads are joined) is triggered: ``` ASSERT_FALSE(bg_compact_started.load()); ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/8112 Test Plan: ``` make check gtest-parallel --repeat=10000 ./external_sst_file_test --gtest_filter="*PickedLevelBug" ``` Reviewed By: riversand963 Differential Revision: D27343185 Pulled By: ltamasi fbshipit-source-id: 2a8c3aa68bc78cc03ec0dbae909fb25c2cd15c69
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/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/ 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.