The thread is processing events for binary logging.
Processing events from schema table
The thread is doing the work of schema replication.
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 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.
The thread is waiting for a schema epoch (that is, a global checkpoint).