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90c3b2835d
New Feature: ======== This feature adds a safe replacement to the MASTER_USE_GTID=Current_Pos option for CHANGE MASTER TO as MASTER_DEMOTE_TO_SLAVE=<bool>. The use case of Current_Pos is to transition a master to become a slave; however, can break replication state if the slave executes local transactions due to actively updating gtid_current_pos with gtid_binlog_pos and gtid_slave_pos. MASTER_DEMOTE_TO_SLAVE changes this use case by forcing users to set Using_Gtid=Slave_Pos and merging gtid_binlog_pos into gtid_slave_pos once at CHANGE MASTER TO time. Note that if gtid_slave_pos is more recent than gtid_binlog_pos (as in the case of chain replication), the replication state should be preserved. Additionally, deprecate the `Current_Pos` option of MASTER_USE_GTID to suggest the safe alternative option MASTER_DEMOTE_TO_SLAVE=TRUE. Reviewed By: ============ Andrei Elkin <andrei.elkin@mariadb.com>
137 lines
4.3 KiB
Plaintext
137 lines
4.3 KiB
Plaintext
connect slave1,127.0.0.1,root,,,$SERVER_MYPORT_3;
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connect slave2,127.0.0.1,root,,,$SERVER_MYPORT_4;
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connect master1,127.0.0.1,root,,,$SERVER_MYPORT_1;
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connect master2,127.0.0.1,root,,,$SERVER_MYPORT_2;
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connection slave1;
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CHANGE MASTER 'slave1' TO master_port=MYPORT_1, master_host='127.0.0.1', master_user='root';
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CHANGE MASTER 'slave2' TO master_port=MYPORT_2, master_host='127.0.0.1', master_user='root';
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set default_master_connection = 'slave1';
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START SLAVE;
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include/wait_for_slave_to_start.inc
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set default_master_connection = 'slave2';
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START SLAVE;
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include/wait_for_slave_to_start.inc
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set default_master_connection = '';
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connection slave2;
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CHANGE MASTER TO master_port=MYPORT_3, master_host='127.0.0.1', master_user='root';
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start all slaves;
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Warnings:
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Note 1937 SLAVE '' started
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include/wait_for_slave_to_start.inc
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connection master1;
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SET GLOBAL gtid_domain_id= 1;
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SET SESSION gtid_domain_id= 1;
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CREATE TABLE t3 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=InnoDB;
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CREATE TABLE t1 (a INT PRIMARY KEY, b VARCHAR(10));
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INSERT INTO t1 VALUES (1, "initial");
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INSERT INTO t3 VALUES (101, "initial 1");
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connection slave1;
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connection master2;
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SET GLOBAL gtid_domain_id= 2;
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SET SESSION gtid_domain_id= 2;
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CREATE TABLE t2 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=InnoDB;
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INSERT INTO t2 VALUES (1, "initial");
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SET SQL_LOG_BIN=0;
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CREATE TABLE t3 (a INT PRIMARY KEY, b VARCHAR(10));
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SET SQL_LOG_BIN=1;
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INSERT INTO t3 VALUES (201, "initial 2");
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connection slave2;
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*** Now move slave2 to replicate from both master1 and master2 instead of just slave1 ***
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STOP ALL SLAVES;
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Warnings:
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Note 1938 SLAVE '' stopped
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connection master1;
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INSERT INTO t1 VALUES (2, "switch1");
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INSERT INTO t3 VALUES (102, "switch1 a");
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connection master2;
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INSERT INTO t2 VALUES (2, "switch1");
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INSERT INTO t3 VALUES (202, "switch1 b");
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connection slave2;
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CHANGE MASTER 'slave1' TO master_port=MYPORT_1, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;
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Warnings:
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Warning 1681 'master_use_gtid=current_pos' is deprecated and will be removed in a future release. Please use master_demote_to_slave=1 instead
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CHANGE MASTER 'slave2' TO master_port=MYPORT_2, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;
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Warnings:
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Warning 1681 'master_use_gtid=current_pos' is deprecated and will be removed in a future release. Please use master_demote_to_slave=1 instead
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SET default_master_connection = 'slave1';
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START SLAVE;
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include/wait_for_slave_to_start.inc
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SET default_master_connection = 'slave2';
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START SLAVE;
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include/wait_for_slave_to_start.inc
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set default_master_connection = '';
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*** Move slave1 to replicate from slave2 instead of from master1 and master2 ***
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connection slave1;
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STOP SLAVE 'slave1';
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connection master1;
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INSERT INTO t1 VALUES (3, "switch 2");
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INSERT INTO t3 VALUES (103, "switch 2 a");
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connection slave2;
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connection master2;
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INSERT INTO t2 VALUES (3, "switch 2");
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INSERT INTO t3 VALUES (203, "switch 2 b");
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include/save_master_gtid.inc
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connection slave1;
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STOP SLAVE 'slave2';
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connection master2;
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INSERT INTO t2 VALUES (4, "switch 3");
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INSERT INTO t3 VALUES (204, "switch 3 b");
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connection slave2;
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include/sync_with_master_gtid.inc
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connection slave1;
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CHANGE MASTER TO master_port=MYPORT_4, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;
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Warnings:
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Warning 1681 'master_use_gtid=current_pos' is deprecated and will be removed in a future release. Please use master_demote_to_slave=1 instead
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START SLAVE;
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SELECT * FROM t1 ORDER BY a;
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a b
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1 initial
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2 switch1
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3 switch 2
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SELECT * FROM t2 ORDER BY a;
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a b
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1 initial
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2 switch1
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3 switch 2
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4 switch 3
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SELECT * FROM t3 ORDER BY a;
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a b
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101 initial 1
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102 switch1 a
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103 switch 2 a
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201 initial 2
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202 switch1 b
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203 switch 2 b
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204 switch 3 b
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connection master1;
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DROP TABLE t1;
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SET SQL_LOG_BIN=0;
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DROP TABLE t3;
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SET SQL_LOG_BIN=1;
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connection master2;
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DROP TABLE t2;
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DROP TABLE t3;
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connection slave1;
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SET GLOBAL gtid_domain_id=0;
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STOP ALL SLAVES;
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Warnings:
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Note 1938 SLAVE '' stopped
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include/reset_master_slave.inc
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disconnect slave1;
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connection slave2;
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SET GLOBAL gtid_domain_id=0;
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STOP ALL SLAVES;
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Warnings:
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Note 1938 SLAVE 'slave1' stopped
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Note 1938 SLAVE 'slave2' stopped
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include/reset_master_slave.inc
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disconnect slave2;
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connection master1;
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SET GLOBAL gtid_domain_id=0;
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include/reset_master_slave.inc
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disconnect master1;
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connection master2;
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SET GLOBAL gtid_domain_id=0;
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include/reset_master_slave.inc
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disconnect master2;
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