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7614f8fb5d
The design of "binlog group commit" involves carrying some state across transaction boundaries. This includes trx_t::commit_lsn, which keeps track of how much write-ahead log needs to be written. Unfortunately, this field was not reset in a commit where a log write was elided. That would cause an unnecessary wait in a subsequent read-only transaction that happened to reuse the same transaction object. trx_deregister_from_2pc(): Reset trx->commit_lsn so that an earlier write that was executed in the same client connection will not result in an unnecessary wait during a subsequent read operation. trx_commit_complete_for_mysql(): Unless we are inside a binlog group commit, reset trx->commit_lsn. unlock_and_close_files(): Reset trx->commit_lsn after durably writing the log, and remove a redundant log write call from some callers. trx_t::rollback_finish(): Clear commit_lsn, because a rolled-back transaction will not need to be durably written. trx_t::clear_and_free(): Wrapper function to suppress a debug check in trx_t::free(). Also, remove some redundant ut_ad(!trx->will_lock) that will be checked in trx_t::free(). Reviewed by: Vladislav Vaintroub |
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Code status:
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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