WL#8599: Reduce contention in IO and SQL threads

Post push fix to fix sporadic failue of rpl_line_topology_block_receiver.test

Author: Deepthi ES

mysql-test/suite/rpl_gtid/r/rpl_line_topology_block_receiver.result

@@ -10,6 +10,8 @@ CREATE TABLE t1 (c1 INT) ENGINE=InnoDB;
 INSERT INTO t1 VALUES(1);
 [connection server_2]
 include/start_slave.inc
+[connection server_1]
+include/sync_slave_sql_with_master.inc
 # Adding debug point 'updating_received_transaction_set' to @@GLOBAL.debug
 [connection server_1]
 INSERT INTO t1 VALUES(2);

mysql-test/suite/rpl_gtid/t/rpl_line_topology_block_receiver.test

@@ -32,6 +32,11 @@ INSERT INTO t1 VALUES(1);
 --source include/rpl_connection.inc
 --source include/start_slave.inc
 
+--let $rpl_connection_name= server_1
+--source include/rpl_connection.inc
+--let $sync_slave_connection= server_2
+--source include/sync_slave_sql_with_master.inc
+
 # Add debug instrumentation to hold the receiver thread
 # while writing to the relay log.
 --let $debug_point=updating_received_transaction_set