1ed30e08af
If semi-sync is switched off then on while a transaction is in-between binlogging and waiting for an ACK, the semi-sync state of the transaction is removed, leading to a debug assertion that indicates the transaction tried to wait, but cannot receive an ACK signal. More specifically, when semi-sync is switched off, the Active_tranx list is cleared (where a transaction adds an entry to this list during binlogging), and each entry in this list saves the thread which will wait for an ACK, and the thread has the COND variable to signal to wake itself. So if the entry is lost, the Ack_receiver thread won’t be able to find the thread to wake up when an ACK comes in The fix is to ensure that the entry exists before awaiting the ACK, and if there is no entry, skip the wait. In debug builds, an informative message is written explaining that the transaction is skipping its wait. Additional debug-build only logic is added to ensure that the cause of the missing entry is due to semi-sync being turned off and on Reviewed By: ============ Kristian Nielsen <knielsen@knielsen-hq.org> |
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| include | ||
| libmariadb@3b29ff9c91 | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
| mysys | ||
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| CONTRIBUTING.md | ||
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| README.md | ||
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Code status:
ci.appveyor.com
MariaDB: The innovative open source 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/
Getting the code, building it and testing it
Refer to the following guide: https://mariadb.org/get-involved/getting-started-for-developers/get-code-build-test/ which outlines how to build the source code correctly and run the MariaDB testing framework, as well as which branch to target for your contributions.
Help
More help is available from the Maria Discuss mailing list https://lists.mariadb.org/postorius/lists/discuss.lists.mariadb.org/ and MariaDB's Zulip instance, https://mariadb.zulipchat.com/
Licensing
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