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Percona XtraDB Cluster 5.6.20-25.7

Percona is glad to announce the release of Percona XtraDB Cluster 5.6 on September 1st 2014. Binaries are available from downloads area or from our software repositories.

Based on Percona Server 5.6.20-68.0 including all the bug fixes in it, Galera Replicator 3.7 and on Codership wsrep API 25.7 is now the current General Availability release. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.6.20-25.7 milestone at Launchpad.

New Features

systemd integration with RHEL/CentOS 7 is now available for Percona XtraDB Cluster (#1342223).

New session variable wsrep_sync_wait has been implemented to control causality check. The old session variable wsrep_causal_reads is deprecated but is kept for backward compatibility (#1277053).

Bugs fixed

Running START TRANSACTION WITH CONSISTENT SNAPSHOT, mysqldump with --single-transaction or mydumper with disabled binlog would lead to a server crash. Bug fixed #1353644.

percona-xtradb-cluster-garbd-3.x package was installed incorrectly on Debian/Ubuntu. Bug fixed #1360633.

Fixed netcat in SST script for Centos7 nmap-ncat. Bug fixed #1359767.

TO isolation was run even when wsrep plugin was not loaded. Bug fixed #1358681.

The error from net read was not handled in native MySQL mode. This would cause duplicate key error if there was unfinished transaction at the time of shutdown, because it would be committed during the startup recovery. Bug fixed #1358264.

The netcat in garbd init script has been replaced with nmap for compatibility in CentOS 7. Bug fixed #1349384.

SHOW STATUS was generating debug output in the error log. Bug fixed #1347818.

Incorrect source string length could lead to server crash. This fix allows maximum of 3500 bytes of key material to be populated, longer keys will be truncated. Bug fixed #1347768.

A memory leak in wsrep_mysql_parse function has been fixed. Bug fixed #1345023.

wsrep consistency check is now enabled for REPLACE ... SELECT as well. This was implemented because pt-table-checksum uses REPLACE .. SELECT during checksumming. Bug fixed #1343209.

Client connections were closed unconditionally before generating SST request. Fixed by avoiding closing connections when wsrep is initialized before storage engines. Bug fixed #1258658.

Session-level binlog_format change to STATEMENT is now allowed to support pt-table-checksum. A warning (to not use it otherwise) is also added to error log.

Other bug fixes: #1280270.

Help us improve quality by reporting any bugs you encounter using our bug tracking system. As always, thanks for your continued support of Percona!

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