5bbda97111
crash recovery Summary ======= When doing server recovery, the active transactions will be rolled back by InnoDB background rollback thread automatically. The prepared transactions will be committed or rolled back accordingly by binlog recovery. Binlog recovery is done in main thread before the server can provide service to users. If there is a big transaction to rollback, the server will not available for a long time. This patch provides a way to rollback the prepared transactions asynchronously. Thus the rollback will not block server startup. Design ====== - Handler::recover_rollback_by_xid() This patch provides a new handler interface to rollback transactions in recover phase. InnoDB just set the transaction's state to active. Then the transaction will be rolled back by the background rollback thread. - Handler::signal_tc_log_recover_done() This function is called after tc log is opened(typically binlog opened) has done. When this function is called, all transactions will be rolled back have been reverted to ACTIVE state. Thus it starts rollback thread to rollback the transactions. - Background rollback thread With this patch, background rollback thread is defered to run until binlog recovery is finished. It is started by innobase_tc_log_recovery_done(). |
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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 our security-policy.
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server