基于GTID的故障切换

喜欢ヅ旅行 2022-06-14 02:16 156阅读 0赞

数据库状态

主库1：192.168.1.246:3306  
    从库1：192.168.1.246:3307  
    从库2：192.168.1.246:3308

主库1
    (root:127.0.0.1:3306) [db3306]> show master status;
    +------------------+----------+--------------+------------------+-------------------------------------------+
    | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                         |
    +------------------+----------+--------------+------------------+-------------------------------------------+
    | mysql-bin.000002 |     2464 |              |                  | d023f67f-4a90-11e7-9eff-0800271d97b5:1-12 |
    +------------------+----------+--------------+------------------+-------------------------------------------+
    从库1
    (root:127.0.0.1:3307) [test]> show master status;
    +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------+
    | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                                                                   |
    +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------+
    | mysql-bin.000008 |     2449 |              |                  | 6e71bd59-4a97-11e7-ad35-0800271d97b5:1-4,
    d023f67f-4a90-11e7-9eff-0800271d97b5:1-12 |
    +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------+
    从库2
    (root:127.0.0.1:3308) [test]> show master status;
    +------------------+----------+--------------+------------------+-----------------------------------------+
    | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                       |
    +------------------+----------+--------------+------------------+-----------------------------------------+
    | mysql-bin.000008 |      426 |              |                  | d023f67f-4a90-11e7-9eff-0800271d97b5:11 |
    +------------------+----------+--------------+------------------+-----------------------------------------+
    
    此时从库2与主库落后一个事物，并且3307本身做过一些操作产生了自己的GTID--6e71bd59-4a97-11e7-ad35-0800271d97b5:1-4

假设此时主库故障，从库1选为新主库，从库2复制，并不需要从库1产生的GTID--6e71bd59-4a97-11e7-ad35-0800271d97b5:1-4的事物，  
操作如下：

(root:127.0.0.1:3308) [test]> reset master ;
    Query OK, 0 rows affected (0.04 sec)
    
    (root:127.0.0.1:3308) [test]> set global gtid_purged='6e71bd59-4a97-11e7-ad35-0800271d97b5:1-4,d023f67f-4a90-11e7-9eff-0800271d97b5:1-11';
    Query OK, 0 rows affected (0.02 sec)
    
    (root:127.0.0.1:3308) [test]> show master status;
    +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------+
    | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                                                                   |
    +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------+
    | mysql-bin.000008 |      154 |              |                  | 6e71bd59-4a97-11e7-ad35-0800271d97b5:1-4,
    d023f67f-4a90-11e7-9eff-0800271d97b5:1-11 |
    +------------------+----------+--------------+------------------+-------------------------------------------------------------------------------------+
    
    
    (root:127.0.0.1:3308) [test]> CHANGE MASTER TO  
        ->     MASTER_HOST = '192.168.1.246',  
        ->     MASTER_PORT = 3307,  
        ->     MASTER_USER = 'repl',  
        ->     MASTER_PASSWORD = 'repl',  
        ->     MASTER_AUTO_POSITION = 1;  
    Query OK, 0 rows affected, 2 warnings (0.02 sec)
    
    (root:127.0.0.1:3308) [test]> start slave;
    Query OK, 0 rows affected (0.01 sec)
    
    (root:127.0.0.1:3308) [test]> show slave status\G
    *************************** 1. row ***************************
                   Slave_IO_State: Waiting for master to send event
                      Master_Host: 192.168.1.246
                      Master_User: repl
                      Master_Port: 3307
                    Connect_Retry: 60
                  Master_Log_File: mysql-bin.000008
              Read_Master_Log_Pos: 2449
                   Relay_Log_File: relay-bin.000002
                    Relay_Log_Pos: 686
            Relay_Master_Log_File: mysql-bin.000008
                 Slave_IO_Running: Yes
                Slave_SQL_Running: Yes
                  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: 2449
                  Relay_Log_Space: 927
                  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: 0
    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: 10153307
                      Master_UUID: 6e71bd59-4a97-11e7-ad35-0800271d97b5
                 Master_Info_File: mysql.slave_master_info
                        SQL_Delay: 0
              SQL_Remaining_Delay: NULL
          Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
               Master_Retry_Count: 86400
                      Master_Bind: 
          Last_IO_Error_Timestamp: 
         Last_SQL_Error_Timestamp: 
                   Master_SSL_Crl: 
               Master_SSL_Crlpath: 
               Retrieved_Gtid_Set: d023f67f-4a90-11e7-9eff-0800271d97b5:12
                Executed_Gtid_Set: 6e71bd59-4a97-11e7-ad35-0800271d97b5:1-4,
    d023f67f-4a90-11e7-9eff-0800271d97b5:1-12
                    Auto_Position: 1
             Replicate_Rewrite_DB: 
                     Channel_Name: 
               Master_TLS_Version: 
    1 row in set (0.00 sec)