restart cluster [--sequential-restart]cluster_name This command performs a rolling restart (seePerforming a Rolling Restart of an NDB Cluster) of the cluster namedcluster_name. The cluster must already be running in order for this command to succeed. (For information about how to determine the operation state of the cluster, seeSection 5.4.6, “Theshow status Command”.)
For example, the command shown here performs a rolling restart of the cluster namedmycluster:
mcm> restart cluster mycluster;+--------------------------------+| Command result |+--------------------------------+| Cluster restarted successfully |+--------------------------------+1 row in set (1 min 22.53 sec) If the cluster is not already running,restart cluster fails with an error, as shown here:
mcm> show status --cluster mycluster;+-----------+---------+---------+| Cluster | Status | Comment |+-----------+---------+---------+| mycluster | stopped | |+-----------+---------+---------+1 row in set (1.49 sec)mcm> restart cluster mycluster;ERROR 5009 (00MGR): Restart can not be performed as processes arestopped in cluster mycluster By default, a rolling restart is performed on the nodes in aparallel manner (that is, half of the nodes are stopped and restarted together, followed by the second half of the nodes). In some situations, you might want to have a rolling restart performed in asequential manner for the data nodes by adding the--sequential-restart option, in which case the data nodes ares stopped and restarted one after another.
Depending on the number of nodes and the amount of data stored in the cluster, a rolling restart can take a considerable amount of time, up to several hours for a cluster with a great many data nodes and a large amount of data.
Currently, there is no mechanism in MySQL Cluster Manager for performing system initial restarts of a cluster. This means that attributes that require an initial restart to be changed must be set before the cluster is started for the first time.