Table of Contents
MySQL NDB Cluster is a high-availability, high-redundancy version of MySQL adapted for the distributed computing environment. The most recent NDB Cluster release series uses version 8 of the NDB storage engine (also known as NDBCLUSTER) to enable running several computers with MySQL servers and other software in a cluster. NDB Cluster 8.0, now available as a General Availability (GA) release beginning with version 8.0.19, incorporates version 8.0 of the NDB storage engine. NDB Cluster 7.6 and NDB Cluster 7.5, still available as GA releases, use versions 7.6 and 7.5 of NDB, respectively. Previous GA releases still available for use in production, NDB Cluster 7.4 and NDB Cluster 7.3, incorporate NDB versions 7.4 and 7.3, respectively. NDB 7.2 and older release series are no longer supported or maintained.
Support for the NDB storage engine is not included in standard MySQL Server 8.0 binaries built by Oracle. Instead, users of NDB Cluster binaries from Oracle should upgrade to the most recent binary release of NDB Cluster for supported platforms—these include RPMs that should work with most Linux distributions. NDB Cluster 8.0 users who build from source should use the sources provided for MySQL 8.0 and build with the options required to provide NDB support. (Locations where the sources can be obtained are listed later in this section.)
MySQL NDB Cluster does not support InnoDB Cluster, which must be deployed using MySQL Server 8.0 with the InnoDB storage engine as well as additional applications that are not included in the NDB Cluster distribution. MySQL Server 8.0 binaries cannot be used with MySQL NDB Cluster. For more information about deploying and using InnoDB Cluster, see Using MySQL AdminAPI. Section 23.1.6, “MySQL Server Using InnoDB Compared with NDB Cluster”, discusses differences between the NDB and InnoDB storage engines.
This chapter contains information about NDB Cluster 8.0 releases through 8.0.26. NDB Cluster 8.0 is now available (beginning with NDB 8.0.19) as a General Availability release, and recommended for new deployments; the latest available release is NDB 8.0.25. NDB Cluster 7.6 and 7.5 are previous GA releases still supported in production; for information about NDB Cluster 7.6, see What is New in NDB Cluster 7.6. For similar information about NDB Cluster 7.5, see What is New in NDB Cluster 7.5. NDB Cluster 7.4 and 7.3 are previous GA releases still supported in production, although we recommend that new deployments for production use NDB Cluster 8.0; see MySQL NDB Cluster 7.3 and NDB Cluster 7.4.
Supported Platforms. NDB Cluster is currently available and supported on a number of platforms. For exact levels of support available for on specific combinations of operating system versions, operating system distributions, and hardware platforms, please refer to https://www.mysql.com/support/supportedplatforms/cluster.html.
Availability. NDB Cluster binary and source packages are available for supported platforms from https://dev.mysql.com/downloads/cluster/.
NDB Cluster release numbers. NDB 8.0 follows the same release pattern as the MySQL Server 8.0 series of releases, beginning with MySQL 8.0.13 and MySQL NDB Cluster 8.0.13. In this Manual and other MySQL documentation, we identify these and later NDB Cluster releases employing a version number that begins with “NDB”. This version number is that of the NDBCLUSTER storage engine used in the NDB 8.0 release, and is the same as the MySQL 8.0 server version on which the NDB Cluster 8.0 release is based.
Version strings used in NDB Cluster software. The version string displayed by the mysql client supplied with the MySQL NDB Cluster distribution uses this format:
mysql-mysql_server_version-cluster
mysql_server_version represents the version of the MySQL Server on which the NDB Cluster release is based. For all NDB Cluster 8.0 releases, this is 8.0., where nn is the release number. Building from source using -DWITH_NDBCLUSTER or the equivalent adds the -cluster suffix to the version string. (See Section 23.2.1.4, “Building NDB Cluster from Source on Linux”, and Section 23.2.2.2, “Compiling and Installing NDB Cluster from Source on Windows”.) You can see this format used in the mysql client, as shown here:
shell>mysqlWelcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 2 Server version: 8.0.26-cluster Source distribution Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql>SELECT VERSION()\G*************************** 1. row *************************** VERSION(): 8.0.26-cluster 1 row in set (0.00 sec)
The first General Availability release of NDB Cluster using MySQL 8.0 is NDB 8.0.19, using MySQL 8.0.19.
The version string displayed by other NDB Cluster programs not normally included with the MySQL 8.0 distribution uses this format:
mysql-mysql_server_versionndb-ndb_engine_version
mysql_server_version represents the version of the MySQL Server on which the NDB Cluster release is based. For all NDB Cluster 8.0 releases, this is 8.0., where nn is the release number. ndb_engine_version is the version of the NDB storage engine used by this release of the NDB Cluster software. For all NDB 8.0 releases, this number is the same as the MySQL Server version. You can see this format used in the output of the SHOW command in the ndb_mgm client, like this:
ndb_mgm> SHOW
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)] 2 node(s)
id=1 @10.0.10.6 (mysql-8.0.25 ndb-8.0.26, Nodegroup: 0, *)
id=2 @10.0.10.8 (mysql-8.0.25 ndb-8.0.26, Nodegroup: 0)
[ndb_mgmd(MGM)] 1 node(s)
id=3 @10.0.10.2 (mysql-8.0.25 ndb-8.0.26)
[mysqld(API)] 2 node(s)
id=4 @10.0.10.10 (mysql-8.0.25 ndb-8.0.26)
id=5 (not connected, accepting connect from any host)
Compatibility with standard MySQL 8.0 releases. While many standard MySQL schemas and applications can work using NDB Cluster, it is also true that unmodified applications and database schemas may be slightly incompatible or have suboptimal performance when run using NDB Cluster (see Section 23.1.7, “Known Limitations of NDB Cluster”). Most of these issues can be overcome, but this also means that you are very unlikely to be able to switch an existing application datastore—that currently uses, for example, MyISAM or InnoDB—to use the NDB storage engine without allowing for the possibility of changes in schemas, queries, and applications. A mysqld compiled without NDB support (that is, built without -DWITH_NDBCLUSTER_STORAGE_ENGINE or its alias -DWITH_NDBCLUSTER) cannot function as a drop-in replacement for a mysqld that is built with it.
NDB Cluster development source trees. NDB Cluster development trees can also be accessed from https://github.com/mysql/mysql-server.
The NDB Cluster development sources maintained at https://github.com/mysql/mysql-server are licensed under the GPL. For information about obtaining MySQL sources using Git and building them yourself, see Section 2.9.5, “Installing MySQL Using a Development Source Tree”.
As with MySQL Server 8.0, NDB Cluster 8.0 releases are built using CMake.
NDB Cluster 8.0 is available beginning with NDB 8.0.19 as a General Availability release, and is recommended for new deployments. NDB Cluster 7.6 and 7.5 are previous GA releases still supported in production; for information about NDB Cluster 7.6, see What is New in NDB Cluster 7.6. For similar information about NDB Cluster 7.5, see What is New in NDB Cluster 7.5. NDB Cluster 7.4 and 7.3 are previous GA releases still supported in production, although we recommend that new deployments for production use NDB Cluster 8.0; see MySQL NDB Cluster 7.3 and NDB Cluster 7.4.
The contents of this chapter are subject to revision as NDB Cluster continues to evolve. Additional information regarding NDB Cluster can be found on the MySQL website at http://www.mysql.com/products/cluster/.
Additional Resources. More information about NDB Cluster can be found in the following places:
For answers to some commonly asked questions about NDB Cluster, see Section A.10, “MySQL 8.0 FAQ: NDB Cluster”.
The NDB Cluster Forum: https://forums.mysql.com/list.php?25.
Many NDB Cluster users and developers blog about their experiences with NDB Cluster, and make feeds of these available through PlanetMySQL.