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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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from cache" and #21216 "Simultaneous DROP TABLE and SHOW OPEN TABLES causes server to crash". Crash happened when one ran DROP DATABASE or SHOW OPEN TABLES statements while concurrently doing DROP TABLE (or RENAME TABLE, CREATE TABLE LIKE or any other command that takes name-lock) in other connection. This problem was caused by the fact that table placeholders which were added to table cache in order to obtain name-lock on table had TABLE_SHARE::db and table_name set to 0. Therefore they broke assumption that these members are non-0 for all tables in table cache on which some of our code relies. The fix sets these members for such placeholders to appropriate value making this assumption true again. As attempt to avoid such problems in future we introduce auxiliary TABLE_SHARE::set_table_cache_key() methods which should be used when one wants to set TABLE_SHARE::table_cache_key and which ensure that TABLE_SHARE::table_name/db are set properly. Test cases for these bugs were added to 5.0 test-suite (with 5.0-specific fix for bug #21216). sql/lock.cc: Our code assumes that TABLE_SHARE::table_name/db for objects in table cache is set properly (and is non-NULL). For example look in list_open_tables() and remove_db_from_cache(). This was not true for table placeholders that were added to table cache for name-locking. Changed lock_table_name() to preserve this assumption (now it uses TABLE_SHARE::set_table_cache_key() to set all three table_cache_key/db/table_name members at once). Also now we use my_multi_malloc() to allocate memory for TABLE and TABLE_SHARE objects instead of using my_malloc() + summing sizes as it automatically provides proper alignment for memory allocated. sql/sql_base.cc: Now we use TABLE_SHARE::set_table_cache_key() auxiliary methods to set TABLE_SHARE::table_cache_key/db/table_name members at once. We also use multi_alloc_root() instead of alloc_root() for allocating memory for several objects as it is less error prone. Finally, we also got rid of unused code in reopen_name_locked_table(). sql/sql_select.cc: Got rid of redundant code. TABLE_SHARE::db/table_cache_key are both set to empty string by the call to init_tmp_table_share() routine. sql/table.cc: Now alloc_table_share() uses auxiliary TABLE_SHARE::set_table_cache_key() method to properly set TABLE_SHARE::table_cache_key/db/table_name members. Also now we use multi_alloc_root() instead of alloc_root() for allocating memory for several objects as it is more clear/less error-prone. sql/table.h: Added comment about importance of apropriate setting of TABLE_SHARE::table_name/db/table_cache_key for tables in table cache. Introduced two auxiliary TABLE_SHARE::set_table_cache_key() methods which allow to set these three members at once. |
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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. - For commercial distributions, see the MySQLEULA.txt 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 Installation chapter. - For future plans, see the TODO appendix. - For the new features/bugfix history, see the News appendix. - For the currently known bugs/misfeatures (known errors) see the problems 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.