MySQL NDB Cluster 7.5  /  NDB Cluster Installation  /  Upgrading and Downgrading NDB Cluster

3.7 Upgrading and Downgrading NDB Cluster

The following sections provide information about upgrading and downgrading NDB Cluster 7.5 and 7.6.

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 6.5, “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 Upgrading MySQL. For information about upgrades to NDB 7.6, see Section 3.7.2, “Upgrading and Downgrading NDB 7.6”.