Binlog dump thread-opracowanie

Binlog dump thread. The master creates a thread to send the binary log contents to a slave
when the slave connects. This thread can be identified in the output of SHOW PROCESSLIST on the
master as the Binlog Dump thread.
The binlog dump thread acquires a lock on the master's binary log for reading each event that is to
be sent to the slave. As soon as the event has been read, the lock is released, even before the event
is sent to the slave.
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