MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
The following list shows the most common states you may see in
the State column for the Binlog
Dump thread of the replication source. If you see no
Binlog Dump threads on a source, this means
that replication is not running; that is, that no replicas are
currently connected.
Finished reading one binlog; switching to next
binlog
The thread has finished reading a binary log file and is opening the next one to send to the replica.
Master has sent all binlog to slave; waiting for
more updates
The thread has read all remaining updates from the binary logs and sent them to the replica. The thread is now idle, waiting for new events to appear in the binary log resulting from new updates occurring on the source.
Binary logs consist of events, where an event is usually an update plus some other information. The thread has read an event from the binary log and is now sending it to the replica.
Waiting to finalize termination
A very brief state that occurs as the thread is stopping.