Percona XtraDB Cluster 5.5.31-23.7.5

Percona is glad to announce the release of Percona XtraDB Cluster on June 24th, 2013. Binaries are available from downloads area or from our software repositories.

This is an General Availability release. We did our best to eliminate bugs and problems during the testing release, but this is a software, so bugs are expected. If you encounter them, please report them to our bug tracking system.

New Features

Information about the wsrep sequence number has been added to INFORMATION_SCHEMA INNODB_TRX table.

Percona XtraDB Cluster can now be bootstrapped with the new bootstrap-pxc option in the init script.

Percona XtraDB Cluster has implemented parallel copying for rsync State Snapshot Transfer method. Bug fixed #1167331 (Mrten).

Percona XtraDB Cluster has implemented new Python version of the clustercheck script.

Percona XtraDB Cluster now has better integration with Percona XtraBackup 2.1 by implementing new xbstream option for xtrabackup State Snapshot Transfer method.

Bugs fixed

Fixed the packaging issues that caused Percona XtraDB Cluster to conflict with MySQL libraries when performing fresh CentOS installation. Bug fixed #1183669.

The RPM installer script had the datadir hardcoded to /var/lib/mysql instead of using my_print_defaults to get the datadir info. bug fixed #1172621.

Fixed the package conflict for percona-xtradb-cluster-client-5.5 package. Bug fixed #1172621.

Fixed the Percona-Server-shared-55 and Percona-XtraDB-Cluster-shared RPM package dependences. Bug fixed #1050654.

mysql_tzinfo_to_sql script failed with Percona XtraDB Cluster since MyISAM DDL/DML were not consistently replicated. Fixed by enabling session variable wsrep_replicate_myisam in the generator file. Bug fixed #1161432.

Startup script on Debian and Ubuntu was failing prematurely during SST. Bug fixed #1099428.

Due to Debian way of stopping/reloading/status checking, there was failure after SST since the machine-specific Debian maintenance password didn’t work. Fixes by using signals instead of mysqladmin as it is done in CentOS. Bug fixed #1098360.

wsrep-recover would create ibdata1 and ib_logfile* files which the SST after that would remove. Bug fixed #1191767.

When running wsrep_recover to recover galera co-ordinates, LRU recover (and its blocking counterpart) were causing issues. Bug fixed #1108035.

Percona XtraDB Cluster improved status visibility in the processlist on other nodes when provider is locked with FLUSH TABLES WITH READ LOCK on one of them. Bug fixed #1109341.

Crash/stalling bugs

Percona Server Crash-Resistant Replication was causing conflicts with wsrep_crash_recovery on a node which is a slave to an async master in standard MySQL replication. Bugs fixed #1182441 and #1180802.

Percona XtraDB Cluster node would hang on shutdown when thread_handling was set to pool-of-threads. Bug Fixed #1185523.

FLUSH TABLES WITH READ LOCK didn’t behave as expected, it had different behavior than the upstream MySQL version. Bug fixed #1170821.

When rsync State Snapshot Transfer failed, the rsync daemon would remain running which caused pid errors on subsequent SST retries. Bug fixed #1169676.

When doing cascading Foreign Key processing Percona XtraDB Cluster was doing unnecessary Foreign Key checks, which are needed only for the purpose of getting Foreign Key parent reference for child table modifications. Bug fixed #1134892.

High priority threads (slave threads, replaying threads, total order isolation threads) were not protected from kill signal and attempt to kill high priority thread could cause server to hang. Bug fixed #1088267.

Galera provider may deadlock if applier thread is still executing apply_trx() while processing commit, it could cause corresponding transaction to be purged from cert index.


Previous Percona XtraDB Cluster release introduced the regression in the RPM packaging that prevented the server from restarting following an upgrade. Bug fixed #1168032.

Other bug fixes: bug fixed #1187526, bug fixed #1133266, bug fixed #1079688, bug fixed #1177211, bug fixed #1166423, bug fixed #1084573, bug fixed #1069829, bug fixed #1012138, bug fixed #1170066, bug fixed #1170706, bug fixed #1182187, bug fixed #1183530, bug fixed #1183997, bug fixed #1184034, bug fixed #1191763, bug fixed #1069829.

Based on Percona Server 5.5.31-30.3 including all the bug fixes in it and on Codership wsrep API 5.5.31-23.7.5, Percona XtraDB Cluster 5.5.31-23.7.5 is now the current stable release. All of Percona‘s software is open-source and free.

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