Percona XtraDB Cluster 5.6.19-25.6 is now available

Percona XtraDB Cluster 5.6.19-25.6Percona is glad to announce the new release of Percona XtraDB Cluster 5.6 on July 21st 2014. Binaries are available from downloads area or from our software repositories. We’re also happy to announce that Ubuntu 14.04 LTS users can now download, install, and upgrade Percona XtraDB Cluster 5.6 from Percona’s software repositories.

Based on Percona Server 5.6.19-67.0 including all the bug fixes in it, Galera Replicator 3.6, and on Codership wsrep API 25.6, Percona XtraDB Cluster 5.6.19-25.6 is now the current General Availability release. All of Percona‘s software is open-source and free, and all the details of the release can be found in the 5.6.19-25.6 milestone at Launchpad.

New Features:

  • Percona XtraDB Cluster now supports storing the Primary Component state to disk by setting the pc.recovery variable to true. The Primary Component can then recover automatically when all nodes that were part of the last saved state reestablish communications with each other. This feature can be used for automatic recovery from full cluster crashes, such as in the case of a data center power outage and graceful full cluster restarts without the need for explicitly bootstrapping a new Primary Component.
  • When joining the cluster, the state message exchange provides us with gcache seqno limits. That information is now used to choose a donor through IST first, and, if this is not possible, only then SST is attempted. The wsrep_sst_donor setting is honored, though, and it is also segment aware.
  • An asynchronous replication slave thread was stopped when the node tried to apply the next replication event while the node was in non-primary state. But it would then remain stopped after the node successfully re-joined the cluster. A new variable, wsrep_restart_slave, has been implemented which controls if the MySQL slave should be restarted automatically when the node re-joins the cluster.
  • Handling install message and install state message processing has been improved to make group forming a more stable process in cases when many nodes are joining the cluster.
  • A new wsrep_evs_repl_latency status variable has been implemented which provides the group communication replication latency information.
  • Node consistency issues with foreign key grammar have been fixed. This fix introduces two new variables: wsrep_slave_FK_checks and wsrep_slave_UK_checks. These variables are set to TRUE and FALSE respectively by default. They control whether Foreign Key and Unique Key checking is done for applier threads.

Bugs Fixed:

  • Fixed the race condition in Foreign Key processing that could cause assertion. Bug fixed #1342959.
  • The restart sequence in scripts/mysql.server would fail to capture and return if the start call failed to start the server. As a result, a restart could occur that failed upon start-up, and the script would still return 0 as if it worked without any issues. Bug fixed #1339894.
  • Updating a unique key value could cause the server to hang if a slave node had enabled parallel slaves. Bug fixed #1280896.
  • Percona XtraDB Cluster has implemented threadpool scheduling fixes. Bug fixed #1333348.
  • garbd was returning an incorrect return code, ie. when garbd was already started, return code was 0. Bug fixed #1308103.
  • rsync SST would silently fail on joiner when the rsync server port was already taken. Bug fixed wsrep_sst_rsync would silently fail on joiner when rsync server port was already taken. Bug fixed #1099783.
  • When gmcast.listen_addr was configured to a certain address, the local connection point for outgoing connections was not bound to the listen address. This would happen if the OS has multiple interfaces with IP addresses in the same subnet. The OS would pick the wrong IP for a local connection point and other nodes would see connections originating from an IP address which was not listened to. Bug fixed #1240964.
  • An issue with re-setting galera provider (in wsrep_provider_options) has been fixed. Bug fixed #1260283.
  • Variable wsrep_provider_options couldn’t be set in runtime if no provider was loaded. Bug fixed #1260290.
  • Percona XtraDB Cluster couldn’t be built with Bison 3.0. Bug fixed #1262439.
  • MySQL wasn’t handling exceeding the max writeset size wsrep error correctly. Bug fixed #1270920.
  • Fixed the issue which caused a node to hang/fail when SELECTs/SHOW STATUS was run after FLUSH TABLES WITH READ LOCK was used on a node with wsrep_causal_reads set to 1 while there was a DML on other nodes. Bug fixed #1271177.
  • Lowest group communication layer (evs) would fail to handle the situation properly when a large number of nodes would suddenly start recognizing each other. Bugs fixed #1271918 and #1249805.
  • Percona XtraBackup SST would fail if the progress option was used with a large number of files. Bug fixed #1294431.

NOTE: When performing an upgrade from an older 5.6 version on Debian/Ubuntu systems, in order to upgrade the Galera package correctly, you’ll need to pin the Percona repository and run: apt-get install percona-xtradb-cluster-56. This is required because older Galera deb packages have an incorrect version number. The correct wsrep_provider_version after upgrade should be 3.6(r3a949e6).

This release contains 50 fixed bugs. The complete list of fixed bugs can be found in our release notes.

Release notes for Percona XtraDB Cluster 5.6.19-25.6 are available in our online documentation along with the installation and upgrade instructions.

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

Percona XtraDB Cluster Errata can be found in our documentation.

[UPDATE 2014-07-24]: Package Percona-XtraDB-Cluster-client-56-5.6.19-25.6.824.el6.x86_64.rpm has been updated to resolve the conflict with Percona-XtraDB-Cluster-devel package.

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Comments (9)

  • Micu Reply

    Do any plan to have the rpm to RHEL-7?


    July 23, 2014 at 6:58 am
  • Hrvoje Matijakovic Reply

    Hi Micu,

    We’re currently working on RHEL-7 packages, we’ll announce it on the blog when they’re ready.

    July 23, 2014 at 7:05 am
  • vinetu Reply

    Yeh.. Thats not cool though:

    Available Packages
    Name : Percona-XtraDB-Cluster-devel-56
    Arch : x86_64
    Epoch : 1
    Version : 5.6.19
    Release : 25.6.824.el6
    Size : 2.8 M
    Repo : percona
    Summary : Percona XtraDB Cluster – Development header files and libraries

    Available Packages
    Name : Percona-XtraDB-Cluster-client-56
    Arch : x86_64
    Epoch : 1
    Version : 5.6.19
    Release : 25.6.824.el6
    Size : 6.1 M
    Repo : percona
    Summary : Percona XtraDB Cluster – client package

    yum install Percona-XtraDB-Cluster-devel-56 Percona-XtraDB-Cluster-client-56

    Resolving Dependencies
    –> Running transaction check
    —> Package Percona-XtraDB-Cluster-client-56.x86_64 1:5.6.19-25.6.824.el6 will be installed
    —> Package Percona-XtraDB-Cluster-devel-56.x86_64 1:5.6.19-25.6.824.el6 will be installed
    –> Processing Conflict: 1:Percona-XtraDB-Cluster-devel-56-5.6.19-25.6.824.el6.x86_64 conflicts mysql
    –> Finished Dependency Resolution
    Error: Percona-XtraDB-Cluster-devel-56 conflicts with 1:Percona-XtraDB-Cluster-client-56-5.6.19-25.6.824.el6.x86_64

    July 24, 2014 at 4:59 am
  • Hrvoje Matijakovic Reply

    Hi vinetu,

    I’ve reported this as a bug, you can track the progress here: Thank you for reporting this.

    July 24, 2014 at 5:19 am
  • Hrvoje Matijakovic Reply

    Hi vinetu,

    We pushed the updated Percona-XtraDB-Cluster-client-56.x86_64 package which resolves this issue. Please (re-)install/upgrade the client package and try again.

    July 24, 2014 at 10:24 am
  • borice Reply

    Hi, and thank you for making the 5.6 series available on Ubuntu 14.04LTS.
    I currently have percona-xtradb-cluster-55 installed on my system… are there any instructions on how to upgrade to percona-xtradb-cluster-56? (or is it as simple as apt-get install percona-xtradb-cluster-56?)

    Thank you!

    August 19, 2014 at 11:55 am
  • borice Reply August 19, 2014 at 11:56 am
  • warza Reply

    Percona 5.6 it’s broken in Ubuntu 14.04. What’s wrong with you guys… Release it and then say ‘we have a bug’? That’s awesome.

    September 27, 2014 at 10:38 am
  • brom Reply


    issue with conflict between client and devel packaged is still present for XtraDB Cluster 5.5. CentOS 6.x.
    Are you plan to fix it?

    November 12, 2015 at 8:06 am

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