CHANGE MASTER 'slave1' TO master_port=MYPORT_1, master_host='127.0.0.1', master_user='root';
CHANGE MASTER 'slave2' TO master_port=MYPORT_2, master_host='127.0.0.1', master_user='root';
set default_master_connection = 'slave1';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = 'slave2';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = '';
CHANGE MASTER TO master_port=MYPORT_3, master_host='127.0.0.1', master_user='root';
start all slaves;
Warnings:
Note	1937	SLAVE '' started
include/wait_for_slave_to_start.inc
SET GLOBAL gtid_domain_id= 1;
SET SESSION gtid_domain_id= 1;
CREATE TABLE t3 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=InnoDB;
CREATE TABLE t1 (a INT PRIMARY KEY, b VARCHAR(10));
INSERT INTO t1 VALUES (1, "initial");
INSERT INTO t3 VALUES (101, "initial 1");
SET GLOBAL gtid_domain_id= 2;
SET SESSION gtid_domain_id= 2;
CREATE TABLE t2 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1, "initial");
SET SQL_LOG_BIN=0;
CREATE TABLE t3 (a INT PRIMARY KEY, b VARCHAR(10));
SET SQL_LOG_BIN=1;
INSERT INTO t3 VALUES (201, "initial 2");
*** Now move slave2 to replicate from both master1 and master2 instead of just slave1 ***
STOP ALL SLAVES;
Warnings:
Note	1938	SLAVE '' stopped
INSERT INTO t1 VALUES (2, "switch1");
INSERT INTO t3 VALUES (102, "switch1 a");
INSERT INTO t2 VALUES (2, "switch1");
INSERT INTO t3 VALUES (202, "switch1 b");
CHANGE MASTER 'slave1' TO master_port=MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;
CHANGE MASTER 'slave2' TO master_port=MYPORT_2, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;
SET default_master_connection = 'slave1';
START SLAVE;
include/wait_for_slave_to_start.inc
SET default_master_connection = 'slave2';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = '';
*** Move slave1 to replicate from slave2 instead of from master1 and master2 ***
STOP SLAVE 'slave1';
INSERT INTO t1 VALUES (3, "switch 2");
INSERT INTO t3 VALUES (103, "switch 2 a");
INSERT INTO t2 VALUES (3, "switch 2");
INSERT INTO t3 VALUES (203, "switch 2 b");
include/save_master_gtid.inc
STOP SLAVE 'slave2';
INSERT INTO t2 VALUES (4, "switch 3");
INSERT INTO t3 VALUES (204, "switch 3 b");
include/sync_with_master_gtid.inc
CHANGE MASTER TO master_port=MYPORT_4, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;
START SLAVE;
SELECT * FROM t1 ORDER BY a;
a	b
1	initial
2	switch1
3	switch 2
SELECT * FROM t2 ORDER BY a;
a	b
1	initial
2	switch1
3	switch 2
4	switch 3
SELECT * FROM t3 ORDER BY a;
a	b
101	initial 1
102	switch1 a
103	switch 2 a
201	initial 2
202	switch1 b
203	switch 2 b
204	switch 3 b
DROP TABLE t1;
SET SQL_LOG_BIN=0;
DROP TABLE t3;
SET SQL_LOG_BIN=1;
DROP TABLE t2;
DROP TABLE t3;
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
Warnings:
Note	1938	SLAVE '' stopped
include/reset_master_slave.inc
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
Warnings:
Note	1938	SLAVE 'slave1' stopped
Note	1938	SLAVE 'slave2' stopped
include/reset_master_slave.inc
SET GLOBAL gtid_domain_id=0;
include/reset_master_slave.inc
SET GLOBAL gtid_domain_id=0;
include/reset_master_slave.inc