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 event from ndbcluster
The server is acting as an SQL node in a MySQL Cluster, and is connected to a cluster management node.
Waiting for ndbcluster binlog update to reach
current position
The thread is waiting for a schema epoch (that is, a global checkpoint).
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