MASTER_POS_WAIT was introduced in MariaDB 10.0.9.
 
Syntax
------ 
MASTER_POS_WAIT(log_name,log_pos[,timeout,["connection_name"]])
 
Description
----------- 
This function is useful in replication for controlling
master/slave synchronization. It blocks until the slave has
read and applied all updates up to the specified position
(log_name,log_pos) in the master log. The return value is
the number of log events the slave had to wait for to
advance to the specified position. The function returns NULL
if
the slave SQL thread is not started, the slave's master
information is not
initialized, the arguments are incorrect, or an error
occurs. It returns -1 if
the timeout has been exceeded. If the slave SQL thread stops
while
 MASTER_POS_WAIT() is waiting, the function returns NULL. If
the slave is past the specified position, the function
returns immediately.
 
If a timeout value is specified, MASTER_POS_WAIT() stops
waiting when timeout seconds have elapsed. timeout must be
greater than 0; a
zero or negative timeout means no timeout.
 
The connection_name is used when you are using
multi-source-replication. If you don't specify it, it's
set to the value of the default_master_connection system
variable.
 
Statements using the MASTER_POS_WAIT() function are not safe
for replication.
 

 
 
 
 
 
 
 

URL: https://mariadb.com/kb/en/master_pos_wait/