The Ultimate Guide to High Availability with MariaDB

MariaDB 10.2.33 Release Notes

The most recent release of MariaDB 10.2 is:
MariaDB 10.2.44 Stable (GA) Download Now

Download Release Notes Changelog Overview of 10.2

Release date: 10 Aug 2020

MariaDB 10.2 is a previous stable series of MariaDB. It is an evolution of MariaDB 10.1 with several entirely new features not found anywhere else and with backported and reimplemented features from MySQL 5.6 and 5.7.

MariaDB 10.2.33 is a Stable (GA) release.

For an overview of MariaDB 10.2 see the What is MariaDB 10.2? page.

Thanks, and enjoy MariaDB!

Notable Changes

Variables

InnoDB

  • InnoDB updated to 5.7.29
  • Fixed corruption in delete buffering (MDEV-22497)
  • Fixed a deadlock in FLUSH TABLES…FOR EXPORT (MDEV-22890)
  • InnoDB data file extension is not crash-safe (MDEV-23190)
  • Minor fixes related to encryption and FULLTEXT INDEX
  • Dropping the adaptive hash index may cause DDL to lock up InnoDB (MDEV-22456)
  • innodb_log_optimize_ddl=OFF is not crash safe (MDEV-21347)
  • Mariadb service won't shutdown when it's running and the OS datetime updated backwards (MDEV-17481)
  • Doublewrite recovery can corrupt data pages (MDEV-11799)
  • Fixed race conditions related to buffer pool resizing
  • Crash recovery fixes (MDEV-21347, MDEV-23190, MDEV-11799)

Replication

  • Make the binlog dump thread to log into errorlog a requested GTID position (MDEV-20428)
  • Fix stop of the optimistic parallel slave at requested START-SLAVE-UNTIL position (MDEV-15152)
  • Properly handle RESET MASTER TO value, when the value exceeds the max allowed 2147483647 (MDEV-22451)
  • Correct 'relay-log.info' updating by concurrent parallel workers (MDEV-22806)
  • Eliminate deadlock involving parallel workers, STOP SLAVE and FLUSH TABLES WITH READ LOCK (MDEV-23089)
  • Correct master-slave automatic reconnection by slave to always pass through all steps of the initial connect. Specifically, do not skip master notification about slave binlog checksum awareness (MDEV-14203)

Optimizer

  • ALTER TABLE ... ANALYZE PARTITION ... with EITS reads and locks all rows ... (MDEV-21472)
  • Print ranges in the optimizer trace created for non-indexed columns when optimizer_use_condition_selectivity >2 Now the optimizer trace shows the ranges constructed while getting estimates from EITS (MDEV-22665)
  • LATERAL DERIVED is not clearly visible in EXPLAIN FORMAT=JSON, make LATERAL DERIVED tables visible in EXPLAIN FORMAT=JSON output (MDEV-17568)
  • Crash on WITH RECURSIVE large query (MDEV-22748)
  • Crash with Prepared Statement with a '?' parameter inside a re-used CTE (MDEV-22779)

Other

  • div_precision_increment is now taken into account for all intermediate calculations. Previously results could be unpredictable. Note that this means results will have a lower precision in some cases - see div_precision_increment (MDEV-19232)
  • MariaDB could crash after changing the query_cache size (MDEV-5924)
  • Errors and SIGSEGV on CREATE TABLE w/ various charsets (MDEV-22111)
  • Crash in CREATE TABLE AS SELECT when the precision of returning type = 0 (MDEV-22502)
  • XA: Reject DDL operations between PREPARE and COMMIT (MDEV-22420)
  • Stop mariabackup --prepare on errors during innodb redo log applying (MDEV-22354)
  • Server crashes in mysql_alter_table upon adding a non-null date column under NO_ZERO_DATE with ALGORITHM=INPLACE (MDEV-18042)
  • Can't uninstall plugin if the library file doesn't exist (MDEV-21258)

Upgrading from 10.2 versions earlier than 10.2.17 is highly recommended
for all Galera users due to bug MDEV-12837 which caused serious stability
issues with earlier versions. See the bug issue page for more information.

When upgrading from MariaDB 10.2.16 or earlier to MariaDB 10.2.17 or higher,
running mysql_upgrade is required due to changes introduced in MDEV-14637.

Changelog

For a complete list of changes made in MariaDB 10.2.33 with links to detailed information on each push, see the changelog.

Contributors

For a full list of contributors to MariaDB 10.2.33, see the MariaDB Foundation release announcement.

Be notified of new MariaDB Server releases automatically by subscribing to the MariaDB Foundation community announce 'at' lists.mariadb.org announcement list (this is a low traffic, announce-only list). MariaDB plc customers will be notified for all new releases, security issues and critical bug fixes for all MariaDB plc products thanks to the Notification Services.

MariaDB may already be included in your favorite OS distribution. More information can be found on the Distributions which Include MariaDB page.

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