wsrep-enabled MySQL (previously MySQL/Galera cluster) can use wsrep replication providers, such as Galera, to form a cluster. wsrep API is an abstract replication interface that supports global transaction ID, true multi-master capability, conflict detection and resolution, and parallel applying and is transparent to triggers, stored procedures, and functions by replicating only final transaction results. Only the InnoDB storage engine and DDL commands are supported by this patch.
Release Notes: This release fixed many bugs related to foreign key handling, tables without primary keys, and a number of other serious problems.
Release Notes: This is a major bugfix and maintenance release. Upgrading is recommended. It fixed foreign keys support (multiple issues), a possible crash in tables without a primary key but with a unique secondary key, a crash with DDL in multi-statement transactions, a blocking problem in RSU DDL, a failure of MySQL slaves to start if no wsrep provider was loaded. It added automatic GTID recovery after a crash by mysqld_safe, xtrabackup SST support, and an update to MySQL 5.5.28.
Release Notes: This release is compatible with MySQL 5.1.62 (a security update) and adds support for wsrep_sst_method=skip and a way to provide a list of peers to mysqld_safe.
Release Notes: This release fixes parallel applying with foreign keys and varchar keys certification. It also adds support for MySQL replication filters, skipping state transfer (wsrep_sst_method=skip), and a way to specify a list of potential peers for the mysqld_safe script.
Release Notes: This version is for MySQL 5.5.23. It fixed problems where ALTER TABLE RENAME and row deletion could conflict on slave, the slave could fail if the max_allowed_packet size was exceeded, the clustered index was not included in the key set, and locking sessions could deadlock multi-master. New experimental features were added: runtime consistency check support, hard crash GTID recovery, MyISAM storage engine support (incomplete), and Solaris 11 x86 build support.