14 Jan 2021

Galera Cluster for MySQL 5.6.50, 5.7.32, and 8.0.22 released

Codership is pleased to announce a new Generally Available (GA) release of the multi-master Galera Cluster for MySQL 5.6, 5.7 and 8.0, consisting of MySQL-wsrep 5.6.50 (release notes, download), 5.7.32 (release notes, download) and 8.0.22 (release notes, download) with Galera replication library 3.32 (release notes, download) implementing wsrep API version 25, and Galera replication library 4.7 (release notes, download) implementing wsrep API version 26 for 8.0. This release incorporates all changes to MySQL 5.6.50, 5.7.32 and 8.0.22 respectively, adding a synchronous option for your MySQL High Availability solutions.

This release is notable because there have been improvements with CRC32 hardware support compatibility on ARM based architectures for the Galera replication library 3.32 and 4.7. GCache locking has also been improved.

From a lower level, the build system has changed from using SCons to CMake, so while SCons scripts are still included they will not be actively maintained any longer.

In MySQL 5.6.50, we improved the XtraBackup v2 SST script for FreeBSD users.

In MySQL 5.7.32, we added a new variable wsrep_mode. The first application of the variable is to allow ignoring native replication filter rules if configured with replicate-do-db. We also improved LOAD DATA splitting to generate Xid events for binary log events with intermediate commits.

In MySQL 8.0.22, we now have a new SST method based on the CLONE plugin. Similar improvements around wsrep_mode exist too. Improvements around foreign key handling are also present in this release: load data with foreign keys had intermittent failures that have been fixed, as well as BF-BF conflicts between OPTIMIZE/REPAIR/ALTER TABLE and DML in presence of foreign key constraints were suppressed. We would also like to note that Percona XtraBackup version 8.0.22-15.0 and greater is required to perform XtraBackup based SSTs.

For now, MySQL 5.6.50 and 5.7.32 are the last official builds for CentOS 6 and Red Hat Enterprise Linux 6. It is also important to remember that MySQL 5.6 is nearing End Of Life (EOL) so we do recommend that you upgrade to MySQL-wsrep 5.7.