4f8555f1f6
MDEV-14511 tried to avoid some consistency problems related to InnoDB persistent statistics. The persistent statistics are being written by an InnoDB internal SQL interpreter that requires the InnoDB data dictionary cache to be locked. Before MDEV-14511, the statistics were written during DDL in separate transactions, which could unnecessarily reduce performance (each commit would require a redo log flush) and break atomicity, because the statistics would be updated separately from the dictionary transaction. However, because it is unacceptable to hold the InnoDB data dictionary cache locked while suspending the execution for waiting for a transactional lock (in the mysql.innodb_index_stats or mysql.innodb_table_stats tables) to be released, any lock conflict was immediately be reported as "lock wait timeout". To fix MDEV-14941, an attempt to reduce these lock conflicts by acquiring transactional locks on the user tables in both the statistics and DDL operations was made, but it would still not entirely prevent lock conflicts on the mysql.innodb_index_stats and mysql.innodb_table_stats tables. Fixing the remaining problems would require a change that is too intrusive for a GA release series, such as MariaDB 10.2. Thefefore, we revert the change MDEV-14511. To silence the MDEV-13201 assertion, we use the pre-existing flag trx_t::internal. |
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|---|---|---|
| BUILD | ||
| client | ||
| cmake | ||
| dbug | ||
| debian | ||
| Docs | ||
| extra | ||
| include | ||
| libmariadb@f3944bbd36 | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
| mysys | ||
| mysys_ssl | ||
| pcre | ||
| plugin | ||
| randgen/conf | ||
| scripts | ||
| sql | ||
| sql-bench | ||
| sql-common | ||
| storage | ||
| strings | ||
| support-files | ||
| tests | ||
| unittest | ||
| vio | ||
| win | ||
| wsrep | ||
| zlib | ||
| .gitattributes | ||
| .gitignore | ||
| .gitmodules | ||
| .travis.compiler.sh | ||
| .travis.yml | ||
| appveyor.yml | ||
| BUILD-CMAKE | ||
| CMakeLists.txt | ||
| config.h.cmake | ||
| configure.cmake | ||
| COPYING | ||
| COPYING.thirdparty | ||
| CREDITS | ||
| EXCEPTIONS-CLIENT | ||
| INSTALL-SOURCE | ||
| INSTALL-WIN-SOURCE | ||
| KNOWN_BUGS.txt | ||
| README.md | ||
| VERSION | ||
MariaDB: drop-in replacement for MySQL
MariaDB is 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. 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 Foundation and the MariaDB Corporation, 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.org/ https://mariadb.com/kb/en/ https://mariadb.com/kb/en/mariadb-vs-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
As MariaDB is a full replacement of MySQL, the MySQL manual at http://dev.mysql.com/doc is generally applicable.
Help:
More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode.
License:
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, COPYING.LESSER, and COPYING.thirdparty files.
Bug Reports:
Bug and/or error reports regarding MariaDB should be submitted at https://mariadb.org/jira
Bugs in the MySQL code can also be submitted at https://bugs.mysql.com
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server
Code status:
travis-ci.org (10.2 branch)