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 wsrep_reject_queries has been implemented that can be used to reject queries for that node. This can be useful if someone wants to manually run maintenance on the node like mysqldump without need to change the settings on the load balancer.
Variable wsrep_sst_donor has been extended to accept multiple hostnames that are preferred as State Snapshot Transfer donors. This can be helpful in case other nodes on the list go down or it can be used as a whitelist during automated provisioning.
Desync functionality has now been exposed to the client. This can be done either via /*! WSREP_DESYNC */ comment on the query or by setting the global wsrep_desync variable to 1.
Percona XtraDB Cluster has implemented progress indicator for XtraBackup SST.
XtraBackup SST now works in two stages. This was implemented to avoid issues like bug bug:1193240.
When multiple slave threads were configured, if there was a query on different transaction that inserts a row, and a query on another transaction within the same thread id that depends on the first row (FK constraint), sometimes the second transaction would be executed first causing the Foreign Key violation. Bug fixed #1217653.
Percona XtraDB Cluster would crash with message: Error "no such a transition EXECUTING -> COMMITTED" on the master node. This bug was fixed only for some cases. Bug fixed #1123233.
Stopping mysql process with inet script didn’t work if PID file was provided as pid_file option in the my.cnf configuration file. Bug fixed #1208865.
When read-only variable was set to ON, Percona XtraDB Cluster would block SELECT statements as well. Bug fixed #1091099.
In geo-DR setup using garbd, performance would degrade with node count when cross data center link was down. Bug fixed #1182960.
PID detection in the init script wasn’t working correctly if the PID file was specified with the relative path. Bug fixed #1194998.
Fixed the packaging issue caused by shared-compat linking. Bug fixed #1201393.
Fixed the platform dependent code in wsrep which was required to make the code portable to MacOS X and FreeBSD. Bug fixed #1201893.
pyclustercheck script did not work correctly with HAProxy. Bug fixed #1210239.
pyclustercheck script didn’t work as expected when available node was a donor. Bug fixed #1211249.
When table was created with LIKE and the source table was temporary table, create statement would be replicated to the slave nodes where it couldn’t be applied because the temporary table wasn’t present on the slave nodes. This would cause other nodes to crash if there were later DML commands for this table. Bug fixed #1212247.
Non-unique indexes in a parent table (as referenced by some foreign key constraint), would be included in write set population. i.e. key values in all non-unique indexes will be appended in the write set’s key set. This could cause excessive multi-master conflicts, especially if the parent table has non-unique indexes with low selectivity. Bug fixed #1216805.
Added information to InnoDB status if the transaction is waiting on TOI. Bug fixed #1219856.
Binary build was linked against libssl.so.10 and libcrypto.so.10 which was making it hard to run on SUSE Linux Enterprise Server 11. Bug fixed #1213855.
GU_AVPHYS_SIZE would report more available memory than could be addressed on 32-bit systems. Bug fixed #1204241.
Other bug fixes: bug fixed #1210638, bug fixed #1222777, bug fixed #1216904, bug fixed #1205467, bug fixed #1196898, bug fixed #1195355, bug fixed #1049599, bug fixed #1191395, bug fixed #1017526, bug fixed #1213073, bug fixed #1171759, bug fixed #1210618, bug fixed #1190756.
For Debian/Ubuntu users: Percona XtraDB Cluster 5.5.33-23.7.6 includes a new dependency, the socat package. If the socat is not previously installed, percona-xtradb-cluster-server-5.5 may be held back. In order to upgrade, you need to either install socat before running the apt-get upgrade or by writing the following command: apt-get install percona-xtradb-cluster-server-5.5. For Ubuntu users the socat package is in the universe repository, so the repository will have to be enabled in order to install the package.
Based on Percona Server 5.5.33-31.1 including all the bug fixes in it, Galera Replicator and on Codership wsrep API 5.5.33-23.7.6, Percona XtraDB Cluster 5.5.33-23.7.6 is now the current stable release. All of Percona‘s software is open-source and free.
Percona XtraDB Cluster Errata can be found in our documentation.