mysql 组复制和传统复制_MySQL的GTID复制与传统复制的相互切换

1. GTID复制转换成传统复制

1.1 环境准备

类型

ip

prot

server-id

master

192.168.56.100

3307

1003307

slave

192.168.56.200

3307

2003307

1.2 停止slave

root@localhost [(none)] 09:38:41>stop slave

1.3 查看当前主从状态

记录Relay_Master_Log_File和Exec_Master_Log_Pos信息。

root@localhost [(none)] 09:41:22>show slave statusG

*************************** 1. row ***************************

Slave_IO_State:

Master_Host: 192.168.56.100

Master_User: repl

Master_Port: 3307

Connect_Retry: 60

Master_Log_File: my3307_binlog.000005

Read_Master_Log_Pos: 194

Relay_Log_File: mysqldb2-relay-bin.000010

Relay_Log_Pos: 375

Relay_Master_Log_File: my3307_binlog.000005

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: 194

Relay_Log_Space: 585

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: 1003307

Master_UUID: 3a068bf8-cdeb-11e8-8176-080027b0b461

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:

Executed_Gtid_Set: 3a068bf8-cdeb-11e8-8176-080027b0b461:1-12

Auto_Position: 1

Replicate_Rewrite_DB:

Channel_Name:

Master_TLS_Version:

1 row in set (0.00 sec)

1.4 change master

根据上面记录的Relay_Master_Log_File和Exec_Master_Log_Pos信息，change master：

root@localhost [(none)] 09:41:26>change master to master_log_file='my3307_binlog.000005',master_log_pos=194,master_auto_position=0;

Query OK, 0 rows affected (0.01 sec)

#参数解释：

master_auto_position=0 表示禁用master_auto_position

1.5 启动主从复制

root@localhost [test] 09:51:28>start slave;

1.6 在线关闭主从服务器的GTID

root@localhost [test] 09:55:01> set global gtid_mode=on_permissive;

Query OK, 0 rows affected (0.01 sec)

root@localhost [test] 09:55:25> set global gtid_mode=off_permissive;

Query OK, 0 rows affected (0.01 sec)

root@localhost [test] 09:55:58> set global gtid_mode=off;

Query OK, 0 rows affected (0.01 sec)

root@localhost [test] 09:56:09> set global enforce_gtid_consistency = 0;

Query OK, 0 rows affected (0.00 sec)

root@localhost [test] 09:57:34> show variables like '%gtid%';

+----------------------------------+-----------+

| Variable_name | Value |

+----------------------------------+-----------+

| binlog_gtid_simple_recovery | ON |

| enforce_gtid_consistency | OFF |

| gtid_executed_compression_period | 1000 |

| gtid_mode | OFF |

| gtid_next | AUTOMATIC |

| gtid_owned | |

| gtid_purged | |

| session_track_gtids | OFF |

+----------------------------------+-----------+

8 rows in set (0.01 sec)

可以把 gtid_mode=off 与 enforce_gtid_consistency=OFF 写入配置文件my.cnf中，重启之后也能生效。

2. 传统复制转换成GTID复制

2.1 环境准备

类型

ip

prot

server-id

master

192.168.56.100

3306

1003306

slave

192.168.56.200

3306

2003306

2.2 将enforce_gtid_consistency设置为warn

在MySQL每个实例上， 将enforce_gtid_consistency设置为warn

root@localhost [(none)] 10:21:01> set @@global.enforce_gtid_consistency=warn;

【注意】：执行完这条语句后，如果出现GTID不兼容的语句用法，会在error log记录相关信息，那么需要调整该程序避免不兼容的写法，直到完全没有不兼容的语句。

2.3 将enforce_gtid_consistency设置为on

在 2.2完成后，如果没有不兼容语句，可以把MySQL每个实例的ENFORCE_GTID_CONSISTENCY值设置为on。

root@localhost [(none)] 11:05:11> set @@global.enforce_gtid_consistency=on;

Query OK, 0 rows affected (0.00 sec)

2.4 设置GTID模式为off_permissive

将所有MySQL实例的GTID模式设置为off_permissive

root@localhost [(none)] 11:06:55>SET @@GLOBAL.GTID_MODE = OFF_PERMISSIVE;

Query OK, 0 rows affected (0.01 sec)

2.5 设置GTID模式为on_permissive

root@localhost [(none)] 11:12:20> SET @@GLOBAL.GTID_MODE = ON_PERMISSIVE;

Query OK, 0 rows affected (0.01 sec)

2.6 检查从库Ongoing_anonymous_transaction_count状态值

检查从库Ongoing_anonymous_transaction_count状态值是否为0，如果为0，一味着没有等待的事务，可以进行下一步操作

root@localhost [(none)] 11:13:09>SHOW STATUS LIKE 'ONGOING_ANONYMOUS_TRANSACTION_COUNT';

+-------------------------------------+-------+

| Variable_name | Value |

+-------------------------------------+-------+

| Ongoing_anonymous_transaction_count | 0 |

+-------------------------------------+-------+

1 row in set (0.00 sec)

2.7 确保所有的匿名事务已经被完全复制到所有的slave上

root@localhost [(none)] 11:29:55>show slave statusG

*************************** 1. row ***************************

...

Relay_Master_Log_File: my3306_binlog.000090

...

Exec_Master_Log_Pos: 194

...

#在slave上使用函数：

root@localhost [(none)] 11:30:01>SELECT MASTER_POS_WAIT('my3306_binlog.000090', 194);

+----------------------------------------------+

| MASTER_POS_WAIT('my3306_binlog.000090', 194) |

+----------------------------------------------+

| 0 |

+----------------------------------------------+

1 row in set (0.00 sec)

返回结果大于或等于0就说明匿名事务已经全部复制完成

2.8 设置GTID_MODE为on

root@localhost [(none)] 11:31:36>SET @@GLOBAL.GTID_MODE = ON;

Query OK, 0 rows affected (0.01 sec)

2.9 change master

root@localhost [(none)] 11:37:17>STOP slave;

Query OK, 0 rows affected (0.00 sec)

root@localhost [(none)] 11:37:24>change master to master_auto_position=1;

Query OK, 0 rows affected (0.00 sec)

root@localhost [(none)] 11:37:52>start slave;

Query OK, 0 rows affected (0.00 sec)