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The MariaDB implementation of page_compressed tables for InnoDB used sparse files. In the worst case, in the data file, every data page will consist of some data followed by a hole. This may be extremely inefficient in some file systems. If the underlying storage device is thinly provisioned (can compress data on the fly), it would be good to write regular files (with sequences of NUL bytes at the end of each page_compressed block) and let the storage device take care of compressing the data. For reads, sparse file regions and regions containing NUL bytes will be indistinguishable. my_test_if_disable_punch_hole(): A new predicate for detecting thinly provisioned storage. (Not implemented yet.) innodb_atomic_writes: Correct the comment. buf_flush_page(): Support all values of fil_node_t::punch_hole. On a thinly provisioned storage device, we will always write NUL-padded innodb_page_size bytes also for page_compressed tables. buf_flush_freed_pages(): Remove a redundant condition. fil_space_t::atomic_write_supported: Remove. (This was duplicating fil_node_t::atomic_write.) fil_space_t::punch_hole: Remove. (Duplicated fil_node_t::punch_hole.) fil_node_t: Remove magic_n, and consolidate flags into bitfields. For punch_hole we introduce a third value that indicates a thinly provisioned storage device. fil_node_t::find_metadata(): Detect all attributes of the file. |
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Code status:
ci.appveyor.com
MariaDB: The open source relational 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/
Help
More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss, MariaDB's Zulip instance, https://mariadb.zulipchat.com/ and the #maria IRC channel on Freenode.
Live QA for beginner contributors
MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip and IRC. From 8:00 to 10:00 UTC on Mondays, and 10:00 to 12:00 UTC on Thursdays, anyone can ask any questions they’d like, and a live developer will be available to assist.
New contributors can ask questions any time, but we will provide immediate feedback during that interval.
Licensing
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 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