9593cccf28
Adaptive flushing is enabled by setting innodb_max_dirty_pages_pct_lwm>0 (not default) and innodb_adaptive_flushing=ON (default). There is also the parameter innodb_adaptive_flushing_lwm (default: 10 per cent of the log capacity). It should enable some adaptive flushing even when innodb_max_dirty_pages_pct_lwm=0. That is not being changed here. This idea was first presented by Inaam Rana several years ago, and I discussed it with Jean-François Gagné at FOSDEM 2023. buf_flush_page_cleaner(): When we are not near the log capacity limit (neither buf_flush_async_lsn nor buf_flush_sync_lsn are set), also try to move clean blocks from the buf_pool.LRU list to buf_pool.free or initiate writes (but not the eviction) of dirty blocks, until the remaining I/O capacity has been consumed. buf_flush_LRU_list_batch(): Add the parameter bool evict, to specify whether dirty least recently used pages (from buf_pool.LRU) should be evicted immediately after they have been written out. Callers outside buf_flush_page_cleaner() will pass evict=true, to retain the existing behaviour. buf_do_LRU_batch(): Add the parameter bool evict. Return counts of evicted and flushed pages. buf_flush_LRU(): Add the parameter bool evict. Assume that the caller holds buf_pool.mutex and will invoke buf_dblwr.flush_buffered_writes() afterwards. buf_flush_list_holding_mutex(): A low-level variant of buf_flush_list() whose caller must hold buf_pool.mutex and invoke buf_dblwr.flush_buffered_writes() afterwards. buf_flush_wait_batch_end_acquiring_mutex(): Remove. It is enough to have buf_flush_wait_batch_end(). page_cleaner_flush_pages_recommendation(): Avoid some floating-point arithmetics. buf_flush_page(), buf_flush_check_neighbor(), buf_flush_check_neighbors(), buf_flush_try_neighbors(): Rename the parameter "bool lru" to "bool evict". buf_free_from_unzip_LRU_list_batch(): Remove the parameter. Only actual page writes will contribute towards the limit. buf_LRU_free_page(): Evict freed pages of temporary tables. buf_pool.done_free: Broadcast whenever a block is freed (and buf_pool.try_LRU_scan is set). buf_pool_t::io_buf_t::reserve(): Retry indefinitely. During the test encryption.innochecksum we easily run out of these buffers for PAGE_COMPRESSED or ENCRYPTED pages. Tested by Matthias Leich and Axel Schwenke |
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| client | ||
| cmake | ||
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| extra | ||
| include | ||
| libmariadb@12bd1d5511 | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
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| sql-common | ||
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| CONTRIBUTING.md | ||
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| INSTALL-WIN-SOURCE | ||
| KNOWN_BUGS.txt | ||
| README.md | ||
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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/
Live QA for beginner contributors
MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip. 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