MySQL的GTID复制与传统复制的相互切换

妖狐艹你老母 2022-12-03 02:28 118阅读 0赞

### MySQL的GTID复制与传统复制的相互转换 ###

*   *  [1. GTID复制转换成传统复制][1. GTID]
        
         *  [1.1 环境准备][1.1]
         *  [1.2 停止slave][1.2 _slave]
         *  [1.3 查看当前主从状态][1.3]
         *  [1.4 change master][]
         *  [1.5 启动主从复制][1.5]
         *  [1.6 在线关闭主从服务器的GTID][1.6 _GTID]
     *  [2. 传统复制转换成GTID复制][2. _GTID]
        
         *  [2.1 环境准备][2.1]
         *  [2.2 将enforce\_gtid\_consistency设置为warn][2.2 _enforce_gtid_consistency_warn]
         *  [2.3 将enforce\_gtid\_consistency设置为on][2.3 _enforce_gtid_consistency_on]
         *  [2.4 设置GTID模式为off\_permissive][2.4 _GTID_off_permissive]
         *  [2.5 设置GTID模式为on\_permissive][2.5 _GTID_on_permissive]
         *  [2.6 检查从库Ongoing\_anonymous\_transaction\_count状态值][2.6 _Ongoing_anonymous_transaction_count]
         *  [2.7 确保所有的匿名事务已经被完全复制到所有的slave上][2.7 _slave]
         *  [2.8 设置GTID\_MODE为on][2.8 _GTID_MODE_on]
         *  [2.9 change master][]

## 1. GTID复制转换成传统复制 ##

[上篇博文已经介绍了MySQL 5.7版本的GTID复制模式的搭建][MySQL 5.7_GTID]，下面操作将GTID复制转换成传统复制模式。

### 1.1 环境准备 ###

<table> 
 <thead> 
  <tr> 
   <th>类型</th> 
   <th>ip</th> 
   <th>prot</th> 
   <th>server-id</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>master</td> 
   <td>192.168.56.100</td> 
   <td>3307</td> 
   <td>1003307</td> 
  </tr> 
  <tr> 
   <td>slave</td> 
   <td>192.168.56.200</td> 
   <td>3307</td> 
   <td>2003307</td> 
  </tr> 
 </tbody> 
</table>

### 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 status\G
    *************************** 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 ##

[此博文介绍了MySQL 5.7版本的传统复制模式的搭建][MySQL 5.7]，下面操作将传统复制转换成GTID复制模式。

### 2.1 环境准备 ###

<table> 
 <thead> 
  <tr> 
   <th>类型</th> 
   <th>ip</th> 
   <th>prot</th> 
   <th>server-id</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>master</td> 
   <td>192.168.56.100</td> 
   <td>3306</td> 
   <td>1003306</td> 
  </tr> 
  <tr> 
   <td>slave</td> 
   <td>192.168.56.200</td> 
   <td>3306</td> 
   <td>2003306</td> 
  </tr> 
 </tbody> 
</table>

### 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 status\G
    *************************** 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)

[1. GTID]: https://blog.csdn.net/wanbin6470398/article/details/83068044#1_GTID_1
[1.1]: https://blog.csdn.net/wanbin6470398/article/details/83068044#11___3
[1.2 _slave]: https://blog.csdn.net/wanbin6470398/article/details/83068044#12_slave_9
[1.3]: https://blog.csdn.net/wanbin6470398/article/details/83068044#13__15
[1.4 change master]: https://blog.csdn.net/wanbin6470398/article/details/83068044#14_change_master_79
[1.5]: https://blog.csdn.net/wanbin6470398/article/details/83068044#15__88
[1.6 _GTID]: https://blog.csdn.net/wanbin6470398/article/details/83068044#16_GTID_92
[2. _GTID]: https://blog.csdn.net/wanbin6470398/article/details/83068044#2__GTID_124
[2.1]: https://blog.csdn.net/wanbin6470398/article/details/83068044#21___126
[2.2 _enforce_gtid_consistency_warn]: https://blog.csdn.net/wanbin6470398/article/details/83068044#22__enforce_gtid_consistencywarn_132
[2.3 _enforce_gtid_consistency_on]: https://blog.csdn.net/wanbin6470398/article/details/83068044#23_enforce_gtid_consistencyon_139
[2.4 _GTID_off_permissive]: https://blog.csdn.net/wanbin6470398/article/details/83068044#24_GTIDoff_permissive_146
[2.5 _GTID_on_permissive]: https://blog.csdn.net/wanbin6470398/article/details/83068044#25_GTIDon_permissive_153
[2.6 _Ongoing_anonymous_transaction_count]: https://blog.csdn.net/wanbin6470398/article/details/83068044#26_Ongoing_anonymous_transaction_count_160
[2.7 _slave]: https://blog.csdn.net/wanbin6470398/article/details/83068044#27_slave_173
[2.8 _GTID_MODE_on]: https://blog.csdn.net/wanbin6470398/article/details/83068044#28_GTID_MODEon_194
[2.9 change master]: https://blog.csdn.net/wanbin6470398/article/details/83068044#29_change_master_201
[MySQL 5.7_GTID]: https://blog.csdn.net/wanbin6470398/article/details/83022476
[MySQL 5.7]: https://blog.csdn.net/wanbin6470398/article/details/82790016