Oracle 5.0 Reference Manual page 1682

Performing a Rolling Restart of a MySQL Cluster
Resource Recovery.
To free memory previously allocated to a table by successive and operations, for re-
INSERT DELETE
use by other MySQL Cluster tables.
The process for performing a rolling restart may be generalized as follows:
1. Stop all cluster management nodes (ndb_mgmd processes), reconfigure them, then restart them.
2. Stop, reconfigure, then restart each cluster data node (ndbd process) in turn.
3. Stop, reconfigure, then restart each cluster SQL node (mysqld process) in turn.
The specifics for implementing a given rolling upgrade depend upon the changes being made. A more
detailed view of the process is presented here:
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