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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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Updates to the bitmap flush/pin logic to prepare for when we support multiple writers. storage/maria/ma_bitmap.c: Read lock is less bad than write lock. Changing bitmap->flushable to a counter, to prepare for when multiple writers are allowed on a table. Using bitmap->flush_all_requested instead of share->in_checkpoint; the latter can be true for the time of a whole checkpoint even though the checkpoint is not yet handling our table, or has already handled it, so to decrease the number of broadcasts we use a dedicated my_bool which is true only when checkpoint is handling this table's bitmap. _ma_bitmap_flushable(share,+1) waits for a concurrent _ma_bitmap_flush_all() to finish before incrementing non_flushable; without this, with multiple writers there may always be one thread making the bitmap unflushable and thus checkpoint would stall. storage/maria/ma_blockrec.c: update to new prototype: "flushable is FALSE|TRUE" becomes "add 1|-1 to non_flushable". storage/maria/ma_blockrec.h: new prototype storage/maria/maria_def.h: MARIA_FILE_BITMAP::flushable becomes a counter. New MARIA_FILE_BITMAP::flush_all_requested. |
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This is a release of MySQL, a dual-license SQL database server. MySQL is brought to you by the MySQL team at MySQL AB. License information can be found in these files: - For GPL (free) distributions, see the COPYING file and the EXCEPTIONS-CLIENT file. - For commercial distributions, see the LICENSE.mysql file. For further information about MySQL or additional documentation, see: - The latest information about MySQL: http://www.mysql.com - The current MySQL documentation: http://dev.mysql.com/doc Some manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section first! - To see what MySQL can do, take a look at the features section. - For installation instructions, see the Installing and Upgrading chapter. - For the new features/bugfix history, see the Change History appendix. - For the currently known bugs/misfeatures (known errors) see the Problems and Common Errors appendix. - For a list of developers and other contributors, see the Credits appendix. A local copy of the MySQL Reference Manual can be found in the Docs directory in GNU Info format. You can also browse the manual online or download it in any of several formats at the URL given earlier in this file. ************************************************************ IMPORTANT: Bug or error reports should be sent to http://bugs.mysql.com.