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The thread is processing events for binary logging.
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Processing events from schema tableThe thread is doing the work of schema replication.
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Syncing ndb table schema operation and binlogThis is used to have a correct binary log of schema operations for NDB.
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Waiting for allowed to take ndbcluster global schema lockThe thread is waiting for permission to take a global schema lock.
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Waiting for event from ndbclusterThe server is acting as an SQL node in an NDB Cluster, and is connected to a cluster management node.
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Waiting for ndbcluster binlog update to reach current position -
Waiting for ndbcluster global schema lockThe thread is waiting for a global schema lock held by another thread to be released.
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The thread is waiting for a schema epoch (that is, a global checkpoint).