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This release is the first GA (Generally Available) stable release in the 2.2 series.
Fixed the InnoDB redo log incompatibility with 5.1/5.5 server and compressed tables which was introduced by the upstream fix in MySQL 5.6.11 that could make InnoDB crash on recovery when replaying redo logs created on earlier versions. Bug fixed #1255476.
Percona XtraBackup did not flush the InnoDB REDO log buffer before finalizing the log copy. This would only become a problem when the binary log coordinates were used after restoring from a backup: the actual data files state after recovery could be inconsistent with the binary log coordinates. Bug fixed #1320685.
innobackupex now sets wsrep_causal_reads to 0 before executing FLUSH TABLES WITH READ LOCK if the server is a member of the Galera cluster. Bug fixed #1320441.
storage/innobase/xtrabackup/CMakeLists.txt now honors the XB_DISTRIBUTION environment variable when configuring innobackupex.pl to innobackupex. Bug fixed #1320856.
Other bugs fixed: #1318540.
All of Percona’s software is open-source and free, all the details of the release can be found in the 2.2.3 milestone at Launchpad.