b762541dd6
Problem is that not all conflicting transactions have THD object. Therefore, it must be checked that victim has THD before it's identification is added to victim list as victim's thread identification is later requested using thd_get_thread_id function that requires that we have valid pointer to THD object in trx->mysql_thd. Victim might not have trx->mysql_thd in two cases: (1) An incomplete transaction that was recovered from undo logs on server startup (and not yet rolled back). (2) Transaction that is in XA PREPARE state and whose client connection was disconnected. Neither of these can complete before lock_wait_wsrep() releases lock_sys.latch. (1) trx_t::commit_in_memory() is clearing both trx_t::state and trx_t::is_recovered before it invokes lock_release(trx_t*) (which would be blocked by the exclusive lock_sys.latch that we are holding here). Hence, it is not possible to write a debug assertion to document this scenario. (2) If is in XA PREPARE state, it would eventually be rolled back and the lock conflict would be resolved when an XA COMMIT or XA ROLLBACK statement is executed in some other connection. Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com> |
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Code status:
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/
Live QA for beginner contributors
MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip. 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