MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0

22.2.8 Upgrading and Downgrading NDB Cluster

This section provides information about NDB Cluster software and table file compatibility between different NDB Cluster 8.0 releases with regard to performing upgrades and downgrades as well as compatibility matrices and notes. You should already be familiar with installing and configuring NDB Cluster prior to attempting an upgrade or downgrade. See Section 22.3, “Configuration of NDB Cluster”.

Schema operations, including SQL DDL statements, cannot be performed while any data nodes are restarting, and thus during an online upgrade or downgrade of the cluster. For other information regarding the rolling restart procedure used to perform an online upgrade, see Section 22.5.5, “Performing a Rolling Restart of an NDB Cluster”.

Important

Only compatibility between MySQL versions with regard to NDBCLUSTER is taken into account in this section, and there are likely other issues to be considered. As with any other MySQL software upgrade or downgrade, you are strongly encouraged to review the relevant portions of the MySQL Manual for the MySQL versions from which and to which you intend to migrate, before attempting an upgrade or downgrade of the NDB Cluster software. See Section 2.11, “Upgrading MySQL”.

The table shown here provides information on NDB Cluster upgrade and downgrade compatibility among different releases of NDB 8.0. Additional notes about upgrades and downgrades to, from, or within the NDB Cluster 8.0 release series can be found following the table.

Upgrades and Downgrades, NDB Cluster 8.0

Figure 22.25 NDB Cluster Upgrade and Downgrade Compatibility, MySQL NDB Cluster 8.0

Graphical representation of the upgrade/downgrade matrix contained in the file storage/ndb/src/common/util/version.cpp from the MySQL 8.0 source tree.

Version support.  The following versions of NDB Cluster are supported for upgrades to GA releases of NDB Cluster 8.0 (8.0.19 and later):

To upgrade from a release series previous to NDB 7.4, you must upgrade in stages, first to one of the versions just listed, and then from that version to the latest NDB 8.0 release. In such cases, upgrading to the latest NDB 7.6 release is recommended as the first step.

Known Issues.  The following issues are known to occur when upgrading to or between NDB 8.0 releases: