8.14.5 Replication Source Thread States
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.
The thread has finished reading a binary log file and is opening the next one to send to the replica.
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.
A very brief state that occurs as the thread is stopping.