13.6.2.4. MASTER_POS_WAIT() Syntax
SELECT MASTER_POS_WAIT('master_log_file', master_log_pos)
This is actually a function, not a statement. It is used to
ensure that the slave has read and executed events up to a
given position in the master's binary log. See
Section 12.10.4, “Miscellaneous Functions”, for a full
description.