MySQL 5.7 GTID复制到传统复制在线切换

一.基本环境
主库1: 10.24.65.30  3306 MySQL 5.7.14
主库2: 10.24.65.30  3307 mysql 5.7.14
从库:10.24.65.33  3306 mysql 5.7.14
基于gtid的多源复制。

二.gtid-mode的几种状态说明:
off :不产生gtid,基于binlog+position,slave也不能接受gtid的日志;
off_permissive:不产生gtid,但做为slave可以识别gtid事务也可以识别非gtid事务;
on_permissive:产生gtid事务,slave可以处理gtid事务和非gtid事务;
on:产生gtid事务,slave只接受gtid事务。

三.在线切换
1.停掉channel 'master-65303306'的复制,禁止:master_auto_position
先停掉master-65303306的slave,并记录下master_log_file和position信息。
stop slave for channel 'master-65303306';
(product)root@localhost [test]> show slave status for channel 'master-65303306'\G
*************************** 1. row ***************************
              Slave_IO_State:
                  Master_Host: 10.24.65.30
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000435
          Read_Master_Log_Pos: 234
              Relay_Log_File: [email protected]
                Relay_Log_Pos: 447
        Relay_Master_Log_File: mysql-bin.000435
            Slave_IO_Running: No
            Slave_SQL_Running: No
              Replicate_Do_DB:
          Replicate_Ignore_DB:
          Replicate_Do_Table:
      Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                  Last_Errno: 0
                  Last_Error:
                Skip_Counter: 0
          Exec_Master_Log_Pos: 234
              Relay_Log_Space: 1835
              Until_Condition: None
              Until_Log_File:
                Until_Log_Pos: 0
          Master_SSL_Allowed: No
          Master_SSL_CA_File:
          Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
              Master_SSL_Key:
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
              Last_SQL_Errno: 0
              Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
            Master_Server_Id: 65303306
                  Master_UUID: 58abaa9b-73dd-11e6-9690-0050568a704b
            Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State:
          Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
    Last_SQL_Error_Timestamp:
              Master_SSL_Crl:
          Master_SSL_Crlpath:
          Retrieved_Gtid_Set: 58abaa9b-73dd-11e6-9690-0050568a704b:1-16,
ebdca3fd-6eb7-11e6-b20c-0050568a704b:1-32459
            Executed_Gtid_Set: 58abaa9b-73dd-11e6-9690-0050568a704b:1-16,
ebdca3fd-6eb7-11e6-b20c-0050568a704b:1-32459,
ebdca3fd-6eb7-11e6-b20c-0050568a704c:1-2
                Auto_Position: 1
        Replicate_Rewrite_DB:
                Channel_Name: master-65303306
          Master_TLS_Version:
1 row in set (0.00 sec)
根据以上信息编写change master:
change master to master_auto_position=0,master_log_file='mysql-bin.000435',\
master_log_pos='234' for channel 'master-65303306';
start slave for channel 'master-65303306';

2.停掉channel 'master-65303307'的复制,禁止:master_auto_position
先停掉master-65303307的slave,并记录下master_log_file和position信息。
stop slave for channel 'master-65303307';
(product)root@localhost [test]> show slave status for channel 'master-65303307'\G
*************************** 1. row ***************************
              Slave_IO_State:
                  Master_Host: 10.24.65.30
                  Master_User: repl
                  Master_Port: 3307
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000184
          Read_Master_Log_Pos: 475
              Relay_Log_File: [email protected]
                Relay_Log_Pos: 454
        Relay_Master_Log_File: mysql-bin.000184
            Slave_IO_Running: No
            Slave_SQL_Running: No
              Replicate_Do_DB:
          Replicate_Ignore_DB:
          Replicate_Do_Table:
      Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                  Last_Errno: 0
                  Last_Error:
                Skip_Counter: 0
          Exec_Master_Log_Pos: 475
              Relay_Log_Space: 1209
              Until_Condition: None
              Until_Log_File:
                Until_Log_Pos: 0
          Master_SSL_Allowed: No
          Master_SSL_CA_File:
          Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
              Master_SSL_Key:
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
              Last_SQL_Errno: 0
              Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
            Master_Server_Id: 65303307
                  Master_UUID: ebdca3fd-6eb7-11e6-b20c-0050568a704c
            Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State:
          Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
    Last_SQL_Error_Timestamp:
              Master_SSL_Crl:
          Master_SSL_Crlpath:
          Retrieved_Gtid_Set: ebdca3fd-6eb7-11e6-b20c-0050568a704c:1-2
            Executed_Gtid_Set: 58abaa9b-73dd-11e6-9690-0050568a704b:1-16,
ebdca3fd-6eb7-11e6-b20c-0050568a704b:1-32459,
ebdca3fd-6eb7-11e6-b20c-0050568a704c:1-2
                Auto_Position: 1
        Replicate_Rewrite_DB:
                Channel_Name: master-65303307
          Master_TLS_Version:
1 row in set (0.00 sec)

根据以上信息编写change master:
change master to master_auto_position=0,master_log_file='mysql-bin.000184',\
master_log_pos='475' for channel 'master-65303307';
start slave for channel 'master-65303307';

3.执行change master
change master to master_auto_position=0,master_log_file='mysql-bin.000435',\
master_log_pos=234 for channel 'master-65303306';
start slave for channel 'master-65303306';

change master to master_auto_position=0,master_log_file='mysql-bin.000184',\
master_log_pos=475 for channel 'master-65303307';
start slave for channel 'master-65303307';

4.更改日志格式(所有server)
set @@global.gtid_mode=on_permissive;
(product)root@localhost [test]> show variables like 'gtid_mode';
+---------------+---------------+
| Variable_name | Value        |
+---------------+---------------+
| gtid_mode    | ON_PERMISSIVE |
+---------------+---------------+
1 row in set (0.01 sec)

set @@global.gtid_mode=off_permissive;
(product)root@localhost [(none)]> show variables like 'gtid_mode';
+---------------+----------------+
| Variable_name | Value          |
+---------------+----------------+
| gtid_mode    | OFF_PERMISSIVE |
+---------------+----------------+
1 row in set (0.01 sec)

set @@global.gtid_mode=off;
(product)root@localhost [test]> show variables like 'gtid_mode';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| gtid_mode    | OFF  |
+---------------+-------+
1 row in set (0.01 sec)

5.验证更改
master1执行:
(product)root@localhost [mdb1]> insert into mdb1.t1 select 1;
查看slave channel 'master-65303306'的变化 :
插入数据前:
Relay_Master_Log_File: mysql-bin.000438
          Exec_Master_Log_Pos: 234
 Executed_Gtid_Set: 58abaa9b-73dd-11e6-9690-0050568a704b:1-16,
ebdca3fd-6eb7-11e6-b20c-0050568a704b:1-32459,
ebdca3fd-6eb7-11e6-b20c-0050568a704c:1-2
插入数据后:
Relay_Master_Log_File: mysql-bin.000438
          Exec_Master_Log_Pos: 539
 Executed_Gtid_Set: 58abaa9b-73dd-11e6-9690-0050568a704b:1-16,
ebdca3fd-6eb7-11e6-b20c-0050568a704b:1-32459,
ebdca3fd-6eb7-11e6-b20c-0050568a704c:1-2

master2执行:
(product)root@localhost [mdb2]> insert into mdb2.t2 select 1;
插入数据前:
Relay_Master_Log_File: mysql-bin.000187
          Exec_Master_Log_Pos: 194
            Executed_Gtid_Set: 58abaa9b-73dd-11e6-9690-0050568a704b:1-16,
ebdca3fd-6eb7-11e6-b20c-0050568a704b:1-32459,
ebdca3fd-6eb7-11e6-b20c-0050568a704c:1-2
插入数据后:
Relay_Master_Log_File: mysql-bin.000187
          Exec_Master_Log_Pos: 499
            Executed_Gtid_Set: 58abaa9b-73dd-11e6-9690-0050568a704b:1-16,
ebdca3fd-6eb7-11e6-b20c-0050568a704b:1-32459,
ebdca3fd-6eb7-11e6-b20c-0050568a704c:1-2

上面的GTID没有变化,只有pos位点有变化,说明已转换成传统复制生效。

6.更改配置文件
最后记得要更改my.cnf文件中的配置
gtid-mod=off
enforce-gtid-consistency=off

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