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MDEV-5804: If same GTID is received on multiple master connections in multi-source replication, the event is double-executed causing corruption or replication failure

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Before, the arrival of same GTID twice in multi-source replication
would cause double-apply or in gtid strict mode an error.

Keep the behaviour, but add an option --gtid-ignore-duplicates which
allows to correctly handle duplicates, ignoring all but the first.
This relies on the user ensuring correct configuration so that
sequence numbers are strictly increasing within each replication
domain; then duplicates can be detected simply by comparing the
sequence numbers against what is already applied.

Only one master connection (but possibly multiple parallel worker
threads within that connection) is allowed to apply events within
one replication domain at a time; any other connection that
receives a GTID in the same domain either discards it (if it is
already applied) or waits for the other connection to not have
any events to apply.

Intermediate patch, as proof-of-concept for testing. The main limitation
is that currently it is only implemented for parallel replication,
@@slave_parallel_threads > 0.
This commit is contained in:
unknown
2014-03-09 10:27:38 +01:00
parent 5c31e79f8b
commit 2c2478b822
13 changed files with 856 additions and 187 deletions
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24
mysql-test/suite/multi_source/gtid_ignore_duplicates.cnf Normal file
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!include my.cnf
[mysqld.1]
log-slave-updates
loose-innodb
[mysqld.2]
log-slave-updates
loose-innodb
[mysqld.3]
log-bin=server3-bin
log-slave-updates
loose-innodb
[mysqld.4]
server-id=4
log-bin=server4-bin
log-slave-updates
loose-innodb
[ENV]
SERVER_MYPORT_4= @mysqld.4.port
SERVER_MYSOCK_4= @mysqld.4.socket

188
mysql-test/suite/multi_source/gtid_ignore_duplicates.result Normal file
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*** Test all-to-all replication with --gtid-ignore-duplicates ***
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 1;
SET SESSION gtid_domain_id= 1;
CHANGE MASTER 'b2a' TO master_port=MYPORT_2, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
CHANGE MASTER 'c2a' TO master_port=MYPORT_3, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'b2a';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = 'c2a';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = '';
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 2;
SET SESSION gtid_domain_id= 2;
CHANGE MASTER 'a2b' TO master_port=MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
CHANGE MASTER 'c2b' TO master_port=MYPORT_3, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'a2b';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = 'c2b';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = '';
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 3;
SET SESSION gtid_domain_id= 3;
CHANGE MASTER 'a2c' TO master_port=MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
CHANGE MASTER 'b2c' TO master_port=MYPORT_2, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'a2c';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = 'b2c';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = '';
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 1;
SET SESSION gtid_domain_id= 1;
CHANGE MASTER 'a2d' TO master_port=MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'a2d';
START SLAVE;
include/wait_for_slave_to_start.inc
set default_master_connection = '';
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
BEGIN;
INSERT INTO t1 VALUES (2);
INSERT INTO t1 VALUES (3);
COMMIT;
INSERT INTO t1 VALUES (4), (5);
INSERT INTO t1 VALUES (6);
include/save_master_gtid.inc
include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
a
1
2
3
4
5
6
include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
a
1
2
3
4
5
6
include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
a
1
2
3
4
5
6
include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
a
1
2
3
4
5
6
INSERT INTO t1 VALUES (10);
include/save_master_gtid.inc
include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
a
10
STOP SLAVE "c2b";
SET default_master_connection = "c2b";
include/wait_for_slave_to_stop.inc
STOP SLAVE "a2b";
SET default_master_connection = "a2b";
include/wait_for_slave_to_stop.inc
INSERT INTO t1 VALUES (11);
include/save_master_gtid.inc
include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
a
10
11
SET default_master_connection = "b2a";
STOP SLAVE;
include/wait_for_slave_to_stop.inc
INSERT INTO t1 VALUES (12);
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
a
10
12
include/save_master_gtid.inc
START SLAVE "b2a";
SET default_master_connection = "b2a";
include/wait_for_slave_to_start.inc
include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
a
10
11
12
START SLAVE "c2b";
SET default_master_connection = "c2b";
include/wait_for_slave_to_start.inc
START SLAVE "a2b";
SET default_master_connection = "a2b";
include/wait_for_slave_to_start.inc
include/save_master_gtid.inc
include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
a
10
11
12
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
Warnings:
Note 1938 SLAVE 'c2a' stopped
Note 1938 SLAVE 'b2a' stopped
include/reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
Warnings:
Note 1938 SLAVE 'a2b' stopped
Note 1938 SLAVE 'c2b' stopped
include/reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
Warnings:
Note 1938 SLAVE 'a2c' stopped
Note 1938 SLAVE 'b2c' stopped
include/reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
Warnings:
Note 1938 SLAVE 'a2d' stopped
include/reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;

208
mysql-test/suite/multi_source/gtid_ignore_duplicates.test Normal file
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--source include/not_embedded.inc
--source include/have_innodb.inc
--echo *** Test all-to-all replication with --gtid-ignore-duplicates ***
--connect (server_1,127.0.0.1,root,,,$SERVER_MYPORT_1)
--connect (server_2,127.0.0.1,root,,,$SERVER_MYPORT_2)
--connect (server_3,127.0.0.1,root,,,$SERVER_MYPORT_3)
--connect (server_4,127.0.0.1,root,,,$SERVER_MYPORT_4)
# Setup A <-> B, B <-> C, C <-> A, and A -> D.
--connection server_1
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 1;
SET SESSION gtid_domain_id= 1;
--replace_result $SERVER_MYPORT_2 MYPORT_2
eval CHANGE MASTER 'b2a' TO master_port=$SERVER_MYPORT_2, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
--replace_result $SERVER_MYPORT_3 MYPORT_3
eval CHANGE MASTER 'c2a' TO master_port=$SERVER_MYPORT_3, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'b2a';
START SLAVE;
--source include/wait_for_slave_to_start.inc
set default_master_connection = 'c2a';
START SLAVE;
--source include/wait_for_slave_to_start.inc
set default_master_connection = '';
--connection server_2
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 2;
SET SESSION gtid_domain_id= 2;
--replace_result $SERVER_MYPORT_1 MYPORT_1
eval CHANGE MASTER 'a2b' TO master_port=$SERVER_MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
--replace_result $SERVER_MYPORT_3 MYPORT_3
eval CHANGE MASTER 'c2b' TO master_port=$SERVER_MYPORT_3, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'a2b';
START SLAVE;
--source include/wait_for_slave_to_start.inc
set default_master_connection = 'c2b';
START SLAVE;
--source include/wait_for_slave_to_start.inc
set default_master_connection = '';
--connection server_3
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 3;
SET SESSION gtid_domain_id= 3;
--replace_result $SERVER_MYPORT_1 MYPORT_1
eval CHANGE MASTER 'a2c' TO master_port=$SERVER_MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
--replace_result $SERVER_MYPORT_2 MYPORT_2
eval CHANGE MASTER 'b2c' TO master_port=$SERVER_MYPORT_2, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'a2c';
START SLAVE;
--source include/wait_for_slave_to_start.inc
set default_master_connection = 'b2c';
START SLAVE;
--source include/wait_for_slave_to_start.inc
set default_master_connection = '';
--connection server_4
SET @old_parallel= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=5;
SET @old_ignore_duplicates= @@GLOBAL.gtid_ignore_duplicates;
SET GLOBAL gtid_ignore_duplicates=1;
SET GLOBAL gtid_domain_id= 1;
SET SESSION gtid_domain_id= 1;
--replace_result $SERVER_MYPORT_1 MYPORT_1
eval CHANGE MASTER 'a2d' TO master_port=$SERVER_MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=slave_pos;
set default_master_connection = 'a2d';
START SLAVE;
--source include/wait_for_slave_to_start.inc
set default_master_connection = '';
--connection server_1
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
BEGIN;
INSERT INTO t1 VALUES (2);
INSERT INTO t1 VALUES (3);
COMMIT;
INSERT INTO t1 VALUES (4), (5);
INSERT INTO t1 VALUES (6);
--source include/save_master_gtid.inc
--connection server_2
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
--connection server_3
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
--connection server_4
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
--connection server_1
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
# Test that we can connect at a GTID position that has not yet reached
# that master server.
# We stop the connections C->B and A->B, create an event on C, Check that
# the event has reached A (but not B). Then let A stop and re-connect to
# B, which will connect at the new event, which is in the future for B.
--connection server_3
INSERT INTO t1 VALUES (10);
--source include/save_master_gtid.inc
--connection server_2
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
STOP SLAVE "c2b";
SET default_master_connection = "c2b";
--source include/wait_for_slave_to_stop.inc
STOP SLAVE "a2b";
SET default_master_connection = "a2b";
--source include/wait_for_slave_to_stop.inc
--connection server_3
INSERT INTO t1 VALUES (11);
--source include/save_master_gtid.inc
--connection server_1
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
SET default_master_connection = "b2a";
STOP SLAVE;
--source include/wait_for_slave_to_stop.inc
--connection server_2
INSERT INTO t1 VALUES (12);
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
--source include/save_master_gtid.inc
--connection server_1
START SLAVE "b2a";
SET default_master_connection = "b2a";
--source include/wait_for_slave_to_start.inc
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
--connection server_2
START SLAVE "c2b";
SET default_master_connection = "c2b";
--source include/wait_for_slave_to_start.inc
START SLAVE "a2b";
SET default_master_connection = "a2b";
--source include/wait_for_slave_to_start.inc
--connection server_1
--source include/save_master_gtid.inc
--connection server_2
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 WHERE a >= 10 ORDER BY a;
# Clean up.
--connection server_1
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
--source reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;
--disconnect server_1
--connection server_2
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
--source reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;
--disconnect server_2
--connection server_3
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
--source reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;
--disconnect server_3
--connection server_4
SET GLOBAL gtid_domain_id=0;
STOP ALL SLAVES;
--source reset_master_slave.inc
SET GLOBAL slave_parallel_threads= @old_parallel;
SET GLOBAL gtid_ignore_duplicates= @old_ignore_duplicates;
DROP TABLE t1;
--disconnect server_4