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*** Set up circular ring by schema A->B->C->D->A ***
stop slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
reset master;
reset slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
start slave;
STOP SLAVE;
RESET SLAVE;
RESET MASTER;
STOP SLAVE;
RESET SLAVE;
SET auto_increment_increment = 4;
SET auto_increment_offset = 1;
RESET MASTER;
RESET SLAVE;
CHANGE MASTER TO master_host='127.0.0.1',master_port=MASTER_A_PORT,master_user='root',MASTER_LOG_FILE='MASTER_A_LOG_FILE';
SET auto_increment_increment = 4;
SET auto_increment_offset = 2;
RESET MASTER;
STOP SLAVE;
RESET SLAVE;
CHANGE MASTER TO master_host='127.0.0.1',master_port=MASTER_B_PORT,master_user='root',MASTER_LOG_FILE='MASTER_B_LOG_FILE';
SET auto_increment_increment = 4;
SET auto_increment_offset = 3;
RESET MASTER;
STOP SLAVE;
RESET SLAVE;
CHANGE MASTER TO master_host='127.0.0.1',master_port=MASTER_C_PORT,master_user='root',MASTER_LOG_FILE='MASTER_C_LOG_FILE';
SET auto_increment_increment = 4;
SET auto_increment_offset = 4;
CHANGE MASTER TO master_host='127.0.0.1',master_port=MASTER_D_PORT,master_user='root',MASTER_LOG_FILE='MASTER_D_LOG_FILE';
SHOW VARIABLES LIKE 'auto_increment_%';
Variable_name Value
auto_increment_increment 4
auto_increment_offset 1
SHOW VARIABLES LIKE 'auto_increment_%';
Variable_name Value
auto_increment_increment 4
auto_increment_offset 2
SHOW VARIABLES LIKE 'auto_increment_%';
Variable_name Value
auto_increment_increment 4
auto_increment_offset 3
SHOW VARIABLES LIKE 'auto_increment_%';
Variable_name Value
auto_increment_increment 4
auto_increment_offset 4
1
START SLAVE;
START SLAVE;
START SLAVE;
START SLAVE;
*** Preparing data ***
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;
*** Testing schema A->B->C->D->A ***
INSERT INTO t1(b,c) VALUES('A',1);
INSERT INTO t1(b,c) VALUES('B',1);
INSERT INTO t1(b,c) VALUES('C',1);
INSERT INTO t1(b,c) VALUES('D',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
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
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
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 *
STOP SLAVE;
SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;
include/start_slave.inc
INSERT INTO t1 VALUES(6,'C',2);
INSERT INTO t1(b,c) VALUES('B',2);
INSERT INTO t1(b,c) VALUES('A',2);
INSERT INTO t1(b,c) VALUES('D',2);
* Data on servers (C failed) *
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
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
SELECT 'Master C',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master C a b
Master C 6 C
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 *
STOP SLAVE;
STOP SLAVE;
CHANGE MASTER TO master_host='127.0.0.1',master_port=MASTER_B_PORT,master_user='root',master_log_file='LOG_FILE',master_log_pos=LOG_POS;
include/start_slave.inc
* Check data inserted before failure *
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
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
SELECT 'Master C',a,b FROM t1 WHERE c = 2 ORDER BY a,b;
Master C a b
Master C 6 C
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 *
INSERT INTO t1(b,c) VALUES('A',3);
INSERT INTO t1(b,c) VALUES('B',3);
INSERT INTO t1(b,c) VALUES('D',3);
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
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
SELECT 'Master C',a,b FROM t1 WHERE c = 3 ORDER BY a,b;
Master C a b
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
*** Testing restoring scheme A->B->C->D->A after failure ***
* Remove wrong event from C and restore B->C->D *
include/stop_slave.inc
DELETE FROM t1 WHERE a = 6;
START SLAVE;
RESET MASTER;
RESET SLAVE;
CHANGE MASTER TO master_host='127.0.0.1',master_port=MASTER_C_PORT,master_user='root',master_log_file='LOG_FILE',master_log_pos=LOG_POS;
START SLAVE;
* Check data inserted before restoring schema A->B->C->D->A *
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
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
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
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
* Check data inserted after restoring schema A->B->C->D->A *
INSERT INTO t1(b,c) VALUES('A',4);
INSERT INTO t1(b,c) VALUES('B',4);
INSERT INTO t1(b,c) VALUES('C',4);
INSERT INTO t1(b,c) VALUES('D',4);
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
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
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
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
* Transactions with commits *
BEGIN;
BEGIN;
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
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
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
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
* Transactions with rollbacks *
BEGIN;
BEGIN;
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
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
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
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
*** Clean up ***
DROP TABLE t1,t2;
STOP SLAVE;
RESET SLAVE;
STOP SLAVE;
RESET SLAVE;
STOP SLAVE;
RESET SLAVE;
STOP SLAVE;
RESET SLAVE;
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