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What is MariaDB Galera Cluster?

The most recent release of MariaDB 10.4 is:
MariaDB 10.4.8 DownloadNow
_{Alternate download from mariadb.org}

About

galera_small

MariaDB Galera Cluster is a synchronous multi-master cluster for MariaDB. It is available on Linux only, and only supports the XtraDB/InnoDB storage engines (although there is experimental support for MyISAM - see the wsrep_replicate_myisam system variable).

Features

Synchronous replication
Active-active multi-master topology
Read and write to any cluster node
Automatic membership control, failed nodes drop from the cluster
Automatic node joining
True parallel replication, on row level
Direct client connections, native MariaDB look & feel

Benefits

The above features yield several benefits for a DBMS clustering solution, including:

No slave lag
No lost transactions
Both read and write scalability
Smaller client latencies

The Getting Started with MariaDB Galera Cluster page has instructions on how to get up and running with MariaDB Galera Cluster.

A great resource for Galera users is Codership on Google Groups (codership-team 'at' googlegroups (dot) com) - If you use Galera it is recommended you subscribe.

Galera Versions

MariaDB Galera Cluster is powered by:

MariaDB Server.
The MySQL-wsrep patch for MySQL Server and MariaDB Server developed by Codership. The patch currently supports only Unix-like operating systems.
The Galera wsrep provider library.

In MariaDB 10.1 and later, the MySQL-wsrep patch has been merged into MariaDB Server. This means that the functionality of MariaDB Galera Cluster can be obtained by installing the standard MariaDB Server packages and the Galera wsrep provider library package. The following Galera version corresponds to each MariaDB Server version:

In MariaDB 10.4 and later, MariaDB Galera Cluster uses Galera 4. This means that the MySQL-wsrep patch is version 26 and the Galera wsrep provider library is version 4.
In MariaDB 10.3 and before, MariaDB Galera Cluster uses Galera 3. This means that the MySQL-wsrep patch is version 25 and the Galera wsrep provider library is version 3.

See Deciphering Galera Version Numbers for more information about how to interpret these version numbers.

Galera 4 Versions

The following table lists each version of the Galera 4 wsrep provider, and it lists which version of MariaDB each one was first released in. If you would like to install Galera 4 using yum, apt, or zypper, then the package is called galera-4.

Galera Version	Released in MariaDB Version
26.4.2	MariaDB 10.4.4
26.4.1	MariaDB 10.4.3
26.4.0	MariaDB 10.4.2

Galera 3 Versions

The following table lists each version of the Galera 3 wsrep provider, and it lists which version of MariaDB each one was first released in. If you would like to install Galera 3 using yum, apt, or zypper, then the package is called galera.

Galera Version	Released in MariaDB Version
25.3.27	MariaDB 10.3.18, MariaDB 10.2.27
25.3.26	MariaDB 10.3.14, MariaDB 10.2.23, MariaDB 10.1.39
25.3.25	MariaDB 10.3.12, MariaDB 10.2.20, MariaDB 10.1.38, MariaDB Galera Cluster 10.0.38, MariaDB Galera Cluster 5.5.63
25.3.24	MariaDB 10.4.0, MariaDB 10.3.10, MariaDB 10.2.18, MariaDB 10.1.37, MariaDB Galera Cluster 10.0.37, MariaDB Galera Cluster 5.5.62
25.3.23	MariaDB 10.3.5, MariaDB 10.2.13, MariaDB 10.1.32, MariaDB Galera Cluster 10.0.35, MariaDB Galera Cluster 5.5.60
25.3.22	MariaDB 10.3.3, MariaDB 10.2.11, MariaDB 10.1.29, MariaDB Galera Cluster 10.0.33, MariaDB Galera Cluster 5.5.59
25.3.21	N/A
25.3.20	MariaDB 10.3.1, MariaDB 10.2.6, MariaDB 10.1.23, MariaDB Galera Cluster 10.0.31, MariaDB Galera Cluster 5.5.56
25.3.19	MariaDB 10.3.0, MariaDB 10.2.3, MariaDB 10.1.20, MariaDB Galera Cluster 10.0.29, MariaDB Galera Cluster 5.5.54
25.3.18	MariaDB 10.2.2, MariaDB 10.1.18, MariaDB Galera Cluster 10.0.28, MariaDB Galera Cluster 5.5.53
25.3.17	MariaDB 10.1.17, MariaDB Galera Cluster 10.0.27, MariaDB Galera Cluster 5.5.51
25.3.16	N/A
25.3.15	MariaDB 10.2.0, MariaDB 10.1.13, MariaDB Galera Cluster 10.0.25, MariaDB Galera Cluster 5.5.49
25.3.14	MariaDB 10.1.12, MariaDB Galera Cluster 10.0.24, MariaDB Galera Cluster 5.5.48
25.3.12	MariaDB 10.1.11
25.3.11	N/A
25.3.10	N/A
25.3.9	MariaDB 10.1.3, MariaDB Galera Cluster 10.0.17, MariaDB Galera Cluster 5.5.42
25.3.8	N/A
25.3.7	N/A
25.3.6	N/A
25.3.5	MariaDB 10.1.1, MariaDB Galera Cluster 10.0.10, MariaDB Galera Cluster 5.5.37
25.3.4	N/A
25.3.3	N/A
25.3.2	MariaDB Galera Cluster 10.0.7, MariaDB Galera Cluster 5.5.35