8c2e3259c1
As pointed out by Andrei Elkin, the previous fix did not fix one race condition that may have caused the observed hang. innodb_log_flush_request(): If we are enqueueing the very first request at the same time the log write is being completed, we must ensure that a near-concurrent call to log_flush_notify() will not result in a missed notification. We guarantee this by release-acquire operations on log_requests.start and log_sys.flushed_to_disk_lsn. log_flush_notify_and_unlock(): Cleanup: Always release the mutex. log_sys_t::get_flushed_lsn(): Use acquire memory order. log_sys_t::set_flushed_lsn(): Use release memory order. log_sys_t::set_lsn(): Use release memory order. log_sys_t::get_lsn(): Use relaxed memory order by default, and allow the caller to specify acquire memory order explicitly. Whenever the log_sys.mutex is being held or when log writes are prohibited during startup, we can use a relaxed load. Likewise, in some assertions where reading a stale value of log_sys.lsn should not matter, we can use a relaxed load. This will cause some additional instructions to be emitted on architectures that do not implement Total Store Ordering (TSO), such as POWER, ARM, and RISC-V Weak Memory Ordering (RVWMO). |
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Code status:
travis-ci.org (10.5 branch)ci.appveyor.com
MariaDB: The open source relational database
MariaDB was designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
MariaDB is brought to you by the MariaDB Foundation and the MariaDB Corporation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB.
MariaDB is developed by many of the original developers of MySQL who now work for the MariaDB Corporation, the MariaDB Foundation and by many people in the community.
MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors.
A description of the MariaDB project and a manual can be found at:
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
https://mariadb.com/kb/en/new-and-old-releases/
Help
More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss, MariaDB's Zulip instance, https://mariadb.zulipchat.com/ and the #maria IRC channel on Freenode.
Live QA for beginner contributors
MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip and IRC. From 8:00 to 10:00 UTC on Mondays, and 10:00 to 12:00 UTC on Thursdays, anyone can ask any questions they’d like, and a live developer will be available to assist.
New contributors can ask questions any time, but we will provide immediate feedback during that interval.
Licensing
NOTE:
MariaDB is specifically available only under version 2 of the GNU General Public License (GPLv2). (I.e. Without the "any later version" clause.) This is inherited from MySQL. Please see the README file in the MySQL distribution for more information.
License information can be found in the COPYING file. Third party license information can be found in the THIRDPARTY file.
Bug Reports
Bug and/or error reports regarding MariaDB should be submitted at: https://jira.mariadb.org
For reporting security vulnerabilities see: https://mariadb.org/about/security-policy/
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server