8.14.9 NDB Cluster Thread States

• Committing events to binlog

• Opening mysql.ndb_apply_status

• Processing events

  The thread is processing events for binary logging.

• Processing events from schema table

  The thread is doing the work of schema replication.

• Shutting down

• Syncing ndb table schema operation and binlog

  This is used to have a correct binary log of schema operations for NDB.

• Waiting for allowed to take ndbcluster global schema lock

  The thread is waiting for permission to take a global schema lock.

• Waiting for event from ndbcluster

  The server is acting as an SQL node in an NDB Cluster, and is connected to a cluster management node.

• Waiting for first event from ndbcluster

• Waiting for ndbcluster binlog update to reach current position

• Waiting for ndbcluster global schema lock

  The thread is waiting for a global schema lock held by another thread to be released.

• Waiting for ndbcluster to start

• Waiting for schema epoch

  The thread is waiting for a schema epoch (that is, a global checkpoint).