*** Set up circular replication on four servers *** 
include/rpl_init.inc [topology=1->2->3->4->1]

connection server_4;
SET auto_increment_increment= 4;
SET auto_increment_offset= 4;
connection server_3;
SET auto_increment_increment= 4;
SET auto_increment_offset= 3;
connection server_2;
SET auto_increment_increment= 4;
SET auto_increment_offset= 2;
connection server_1;
SET auto_increment_increment= 4;
SET auto_increment_offset= 1;
*** Preparing data ***
connection server_1;
CREATE TABLE t1 (a INT NOT NULL AUTO_INCREMENT, b VARCHAR(100), c INT NOT NULL, PRIMARY KEY(a)) ENGINE=MyISAM;
CREATE TABLE t2 (a INT NOT NULL AUTO_INCREMENT, b VARCHAR(100), c INT NOT NULL, PRIMARY KEY(a)) ENGINE=InnoDB;
INSERT INTO t2 (b,c) VALUES('MDEV-515', 100);
include/rpl_sync.inc
connection server_4;
call mtr.add_suppression("Slave SQL.*Request to stop slave SQL Thread received while applying a group that has non-transactional changes; waiting for completion of the group");

*** Testing schema A->B->C->D->A ***

connection server_1;
INSERT INTO t1(b,c) VALUES('A',1);
connection server_2;
INSERT INTO t1(b,c) VALUES('B',1);
connection server_3;
INSERT INTO t1(b,c) VALUES('C',1);
connection server_4;
INSERT INTO t1(b,c) VALUES('D',1);
include/rpl_sync.inc
connection server_1;
SELECT 'Master A',a,b FROM t1 WHERE c = 1 ORDER BY a,b;
Master A	a	b
Master A	1	A
Master A	2	B
Master A	3	C
Master A	4	D
connection server_2;
SELECT 'Master B',a,b FROM t1 WHERE c = 1 ORDER BY a,b;
Master B	a	b
Master B	1	A
Master B	2	B
Master B	3	C
Master B	4	D
connection server_3;
SELECT 'Master C',a,b FROM t1 WHERE c = 1 ORDER BY a,b;
Master C	a	b
Master C	1	A
Master C	2	B
Master C	3	C
Master C	4	D
connection server_4;
SELECT 'Master D',a,b FROM t1 WHERE c = 1 ORDER BY a,b;
Master D	a	b
Master D	1	A
Master D	2	B
Master D	3	C
Master D	4	D

*** Testing schema A->B->D->A if C has failure ***

* Do failure for C and then make new connection B->D *
connection server_4;
STOP SLAVE;
SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;
include/start_slave.inc
connection server_3;
INSERT INTO t1 VALUES(6,'C',2);
connection server_4;
connection server_2;
INSERT INTO t1(b,c) VALUES('B',2);
connection server_3;
call mtr.add_suppression("Slave SQL.*Duplicate entry .6. for key .PRIMARY.* error.* 1062");
include/wait_for_slave_sql_error.inc [errno=1062]
connection server_1;
INSERT INTO t1(b,c) VALUES('A',2);
connection server_4;
INSERT INTO t1(b,c) VALUES('D',2);
connection server_2;

* Data on servers (C failed) *
connection server_1;
SELECT 'Master A',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master A	a	b
Master A	5	A
Master A	8	D
connection server_2;
SELECT 'Master B',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master B	a	b
Master B	5	A
Master B	6	B
Master B	8	D
connection server_3;
SELECT 'Master C',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master C	a	b
Master C	6	C
connection server_4;
SELECT 'Master D',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master D	a	b
Master D	8	D

* Reconfigure replication to schema A->B->D->A *
connection server_3;
include/stop_slave_io.inc
connection server_4;
include/stop_slave.inc
include/rpl_change_topology.inc [new topology=1->2->4->1,2->3]
include/start_slave.inc
connection server_2;
connection server_4;
connection server_1;

* Check data inserted before failure *
connection server_1;
SELECT 'Master A',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master A	a	b
Master A	5	A
Master A	6	B
Master A	8	D
connection server_2;
SELECT 'Master B',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master B	a	b
Master B	5	A
Master B	6	B
Master B	8	D
connection server_3;
SELECT 'Master C',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master C	a	b
Master C	6	C
connection server_4;
SELECT 'Master D',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master D	a	b
Master D	5	A
Master D	6	B
Master D	8	D

* Check data inserted after failure *
connection server_1;
INSERT INTO t1(b,c) VALUES('A',3);
connection server_2;
INSERT INTO t1(b,c) VALUES('B',3);
connection server_4;
INSERT INTO t1(b,c) VALUES('D',3);
connection server_1;
include/rpl_sync.inc
connection server_1;
SELECT 'Master A',a,b FROM t1 WHERE c = 3 ORDER BY a,b;
Master A	a	b
Master A	9	A
Master A	10	B
Master A	12	D
connection server_2;
SELECT 'Master B',a,b FROM t1 WHERE c = 3 ORDER BY a,b;
Master B	a	b
Master B	9	A
Master B	10	B
Master B	12	D
connection server_3;
SELECT 'Master C',a,b FROM t1 WHERE c = 3 ORDER BY a,b;
Master C	a	b
connection server_4;
SELECT 'Master D',a,b FROM t1 WHERE c = 3 ORDER BY a,b;
Master D	a	b
Master D	9	A
Master D	10	B
Master D	12	D
connection server_1;

*** Testing restoring scheme A->B->C->D->A after failure ***

* Remove wrong event from C and restore B->C->D *
connection server_4;
include/stop_slave.inc
connection server_3;
DELETE FROM t1 WHERE a = 6;
include/start_slave.inc
connection server_2;
connection server_3;
RESET MASTER;
connection server_4;
RESET SLAVE;
Warnings:
Note	4190	RESET SLAVE is implicitly changing the value of 'Using_Gtid' from 'No' to 'Slave_Pos'
include/rpl_change_topology.inc [new topology=1->2->3->4->1]
include/start_slave.inc
connection server_3;
connection server_4;
include/rpl_sync.inc

* Check data inserted before restoring schema A->B->C->D->A *
connection server_1;
SELECT 'Master A',a,b FROM t1 WHERE c IN (2,3) ORDER BY a,b;
Master A	a	b
Master A	5	A
Master A	6	B
Master A	8	D
Master A	9	A
Master A	10	B
Master A	12	D
connection server_2;
SELECT 'Master B',a,b FROM t1 WHERE c IN (2,3) ORDER BY a,b;
Master B	a	b
Master B	5	A
Master B	6	B
Master B	8	D
Master B	9	A
Master B	10	B
Master B	12	D
connection server_3;
SELECT 'Master C',a,b FROM t1 WHERE c IN (2,3) ORDER BY a,b;
Master C	a	b
Master C	5	A
Master C	6	B
Master C	8	D
Master C	9	A
Master C	10	B
Master C	12	D
connection server_4;
SELECT 'Master D',a,b FROM t1 WHERE c IN (2,3) ORDER BY a,b;
Master D	a	b
Master D	5	A
Master D	6	B
Master D	8	D
Master D	9	A
Master D	10	B
Master D	12	D
connection server_1;

* Check data inserted after restoring schema A->B->C->D->A *
connection server_1;
INSERT INTO t1(b,c) VALUES('A',4);
connection server_2;
INSERT INTO t1(b,c) VALUES('B',4);
connection server_3;
INSERT INTO t1(b,c) VALUES('C',4);
connection server_4;
INSERT INTO t1(b,c) VALUES('D',4);
connection server_1;
include/rpl_sync.inc
connection server_1;
SELECT 'Master A',a,b FROM t1 WHERE c = 4 ORDER BY a,b;
Master A	a	b
Master A	13	A
Master A	14	B
Master A	15	C
Master A	16	D
connection server_2;
SELECT 'Master B',a,b FROM t1 WHERE c = 4 ORDER BY a,b;
Master B	a	b
Master B	13	A
Master B	14	B
Master B	15	C
Master B	16	D
connection server_3;
SELECT 'Master C',a,b FROM t1 WHERE c = 4 ORDER BY a,b;
Master C	a	b
Master C	13	A
Master C	14	B
Master C	15	C
Master C	16	D
connection server_4;
SELECT 'Master D',a,b FROM t1 WHERE c = 4 ORDER BY a,b;
Master D	a	b
Master D	13	A
Master D	14	B
Master D	15	C
Master D	16	D
connection server_1;

* Transactions with commits *
connection server_1;
BEGIN;
connection server_3;
BEGIN;
connection server_1;
include/rpl_sync.inc
connection server_1;
SELECT 'Master A',b,COUNT(*) FROM t2 WHERE c = 1 GROUP BY b ORDER BY b;
Master A	b	COUNT(*)
Master A	A	100
Master A	B	100
Master A	C	100
Master A	D	100
connection server_2;
SELECT 'Master B',b,COUNT(*) FROM t2 WHERE c = 1 GROUP BY b ORDER BY b;
Master B	b	COUNT(*)
Master B	A	100
Master B	B	100
Master B	C	100
Master B	D	100
connection server_3;
SELECT 'Master C',b,COUNT(*) FROM t2 WHERE c = 1 GROUP BY b ORDER BY b;
Master C	b	COUNT(*)
Master C	A	100
Master C	B	100
Master C	C	100
Master C	D	100
connection server_4;
SELECT 'Master D',b,COUNT(*) FROM t2 WHERE c = 1 GROUP BY b ORDER BY b;
Master D	b	COUNT(*)
Master D	A	100
Master D	B	100
Master D	C	100
Master D	D	100
connection server_1;

* Transactions with rollbacks *
connection server_1;
BEGIN;
connection server_3;
BEGIN;
connection server_1;
include/rpl_sync.inc
connection server_1;
SELECT 'Master A',b,COUNT(*) FROM t2 WHERE c = 2 GROUP BY b ORDER BY b;
Master A	b	COUNT(*)
Master A	B	100
Master A	D	100
connection server_2;
SELECT 'Master B',b,COUNT(*) FROM t2 WHERE c = 2 GROUP BY b ORDER BY b;
Master B	b	COUNT(*)
Master B	B	100
Master B	D	100
connection server_3;
SELECT 'Master C',b,COUNT(*) FROM t2 WHERE c = 2 GROUP BY b ORDER BY b;
Master C	b	COUNT(*)
Master C	B	100
Master C	D	100
connection server_4;
SELECT 'Master D',b,COUNT(*) FROM t2 WHERE c = 2 GROUP BY b ORDER BY b;
Master D	b	COUNT(*)
Master D	B	100
Master D	D	100
connection server_1;

*** Clean up ***
connection server_1;
DROP TABLE t1,t2;
include/rpl_end.inc