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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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Merged Facebook commit 617aef9f911d825e9053f3d611d0389e02031225 authored by Inaam Rana to InnoDB storage engine (not XtraDB) from https://github.com/facebook/mysql-5.6 WL#7047 - Optimize buffer pool list scans and related batch processing Reduce excessive scanning of pages when doing flush list batches. The fix is to introduce the concept of "Hazard Pointer", this reduces the time complexity of the scan from O(n*n) to O. The concept of hazard pointer is reversed in this work. Academically hazard pointer is a pointer that the thread working on it will declar such and as long as that thread is not done no other thread is allowe do anything with it. In this WL we declare the pointer as a hazard pointer and then if any thread attempts to work on it, it is allowed to do so but it has to a the hazard pointer to the next valid value. We use hazard pointer sol reverse traversal of lists within a buffer pool instance. Add an event to control the background flush thread. The background f thread wait has been converted to an os event timed wait so that it c signalled by threads that want to kick start a background flush when buffer pool is running low on free/dirty pages. |
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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 file CREDITS 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 MariadB foundation and SkySQL Ab, 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 do 'SHOW authors' to get a list of active contributors. A description of the MariaDB project and a manual can be found at: http://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. More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode. *************************************************************************** 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. *************************************************************************** IMPORTANT: Bug and/or error reports regarding MariaDB should be submitted at http://mariadb.org/jira Bugs in the MySQL code can also be submitted at http://bugs.mysql.com The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server ***************************************************************************