(mysql.info) master-thread-states

(mysql.info) replication-implementation-details

(mysql.info) slave-io-thread-states

 
 6.3.1 Replication Master Thread States
 --------------------------------------
 
 The following list shows the most common states you may see in the
 `State' column for the master's `Binlog Dump' thread. If you see no
 `Binlog Dump' threads on a master server, this means that replication
 is not running -- that is, that no slaves are currently connected.
 
    * `Sending binlog event to slave'
 
      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 slave.
 
    * `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 slave.
 
    * `Has sent all binlog to slave; waiting for binlog to be updated'
 
      The thread has read all outstanding updates from the binary logs
      and sent them to the slave. The thread is now idle, waiting for
      new events to appear in the binary log resulting from new updates
      occurring on the master.
 
    * `Waiting to finalize termination'
 
      A very brief state that occurs as the thread is stopping.

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(mysql.info) replication-implementation-details

(mysql.info) slave-io-thread-states

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