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MySQL NDB Cluster 7.5
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6.24.1.2 Restoring an NDB backup to a later version of NDB Cluster

In general, it should be possible to restore a backup created using the ndb_mgm client START BACKUP command in an older version of NDB to a newer version, provided that you use the ndb_restore binary that comes with the newer version. (It may be possible to use the older version of ndb_restore, but this is not recommended.) Additional potential issues are listed here:

  • When restoring the metadata from a backup (--restore-meta option), ndb_restore normally attempts to reproduce the captured table schema exactly as it was when the backup was taken.

    Tables created in versions of NDB prior to 8.0.14 use .frm files for their metadata. These files can be read by the mysqld in NDB 8.0.14 and later, which can use the information contained therein to create the .sdi files used by the MySQL data dictionary in later versions.

  • When restoring an older backup to a newer version of NDB, it may not be possible to take advantage of newer features such as hashmap partitioning, greater number of hashmap buckets, read backup, and different partitioning layouts. For this reason, it may be preferable to restore older schemas using mysqldump and the mysql client, which allows NDB to make use of the new schema features.

  • Tables using the old temporal types which did not support fractional seconds (used prior to MySQL 5.6.4 and NDB 7.3.31) cannot be restored to NDB 8.0 using ndb_restore. You can check such tables using CHECK TABLE, and then upgrade them to the newer temporal column format, if necessary, using REPAIR TABLE in the mysql client; this must be done prior to taking the backup. See Preparing Your Installation for Upgrade, for more information.

    You also also restore such tables using a dump created with mysqldump.

  • Distributed grant tables created in NDB 7.6 and earlier are not supported in NDB 8.0. Such tables can be restored to an NDB 8.0 cluster, but they have no effect on access control.