# MariaDB Galera Cluster 5.5.52 Release Notes

The most recent [MariaDB Galera Cluster 5.5](https://github.com/mariadb-corporation/docs-release-notes/blob/test/kb/en/galera/README.md) release is:[**MariaDB Galera Cluster 5.5.63**](https://mariadb.com/docs/release-notes/community-server/old-releases/mariadb-galera-cluster-releases/mariadb-galera-55-release-notes/mariadb-galera-cluster-5563-release-notes) [Download Now](https://downloads.mariadb.org/mariadb-galera/5.5.63)

[Download](https://downloads.mariadb.org/mariadb-galera/5.5.52)[Release Notes](https://mariadb.com/docs/release-notes/community-server/old-releases/mariadb-galera-cluster-releases/mariadb-galera-55-release-notes/mariadb-galera-cluster-5552-release-notes)[Changelog](https://mariadb.com/docs/release-notes/community-server/old-releases/mariadb-galera-cluster-releases/mariadb-galera-55-changelogs/mariadb-galera-cluster-5552-changelog)[Overview of MariaDB Galera Cluster](https://github.com/mariadb-corporation/docs-release-notes/blob/test/kb/en/what-is-mariadb-galera-cluster/README.md)

**Release date:** 21 Sep 2016

MariaDB Galera Cluster 5.5.52 is a [***Stable***](https://mariadb.com/docs/release-notes/community-server/about/release-criteria) (GA)\
release. It is a merge of [MariaDB 5.5.52](https://mariadb.com/docs/release-notes/community-server/old-releases/5.5/5.5.52) and [Galera Cluster](https://codership.com/content/using-galera-cluster) with\
additional bug fixes.

Various articles about MariaDB Galera Cluster, including [known limitations](https://app.gitbook.com/s/3VYeeVGUV4AMqrA3zwy7/reference/mariadb-galera-cluster-known-limitations) and [how to get started](https://app.gitbook.com/s/3VYeeVGUV4AMqrA3zwy7/galera-management/installation-and-deployment/getting-started-with-mariadb-galera-cluster) are\
available in the [**Galera**](https://github.com/mariadb-corporation/docs-release-notes/blob/test/kb/en/galera/README.md) section of the documentation.

## Updates and fixes in this version

There was an important security fix included in the MariaDB Galera Cluster 5.5.51 release.Please see the [MariaDB 5.5.51 Release Notes](https://mariadb.com/docs/release-notes/community-server/old-releases/5.5/5.5.51) and [this blog post](https://mariadb.org/mariadb-server-versions-remote-root-code-execution-vulnerability-cve-2016-6662/) for more details.

* This release is a bug-fix release.
* Codership changes:[github.com/codership/mysql-wsrep/tree/5.5](https://github.com/codership/mysql-wsrep/tree/5.5)\
  (till commit `9949137`)
* The [Galera library](https://codership.com/content/using-galera-cluster) used\
  by MariaDB Galera Cluster and included in the MariaDB repositories is\
  currently at version 25.3.17.

## Notes

* Running MariaDB Galera Cluster 5.5 and 10.0 nodes in a cluster is not\
  supported ([MDEV-6257](https://jira.mariadb.org/browse/MDEV-6257))
* This version of MariaDB Galera Cluster supports `wsrep` API v25 which means\
  MariaDB Galera Cluster can be used with either a 25.2.x or 25.3.x\
  Galera `wsrep` provider. A 25.3.x `wsrep` provider is included in the\
  MariaDB repositories and is also available from the [downloads](https://downloads.mariadb.org/mariadb-galera/5.5) page.
* See the [MariaDB 5.5.52 Release Notes](https://mariadb.com/docs/release-notes/community-server/old-releases/5.5/5.5.52) and [Changelog](https://mariadb.com/docs/release-notes/community-server/changelogs/changelogs-mariadb-55-series/mariadb-5552-changelog) for more information on the changes in\
  MariaDB.

Note: If Galera 25.2.x and 25.3.x are both being used in the cluster, MariaDB\
with Galera 25.3.x must be started with [wsrep\_provider\_options='socket.checksum=1'](https://app.gitbook.com/s/3VYeeVGUV4AMqrA3zwy7/reference/wsrep-variable-details/wsrep_provider_options#socketchecksum) in order to make it backward\
compatible with Galera v2. Galera wsrep providers other than 25.3.x or 25.2.x\
are not supported.

## Changelog

A full list of all changes is in the [changelog](https://mariadb.com/docs/release-notes/community-server/old-releases/mariadb-galera-cluster-releases/mariadb-galera-55-changelogs/mariadb-galera-cluster-5552-changelog).

Thanks, and enjoy MariaDB Galera Cluster!

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