MySQL主从复制遇到错误的处理办法

Posted 2020-06-17

mysql在主从复制的时候经常遇到错误而导致Slave复制中断，这个时候就需要人工干涉，来跳过这个错误，才能使Slave端的复制，得以继续进行；

跳过错误的方法：

MariaDB [(none)]> STOP SLAVE;
MariaDB [(none)]> SET GLOBAL  SQL_SLAVE_SKIP_COUNTER=1;
MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE ‘SQL_SLAVE_SKIP_COUNTER‘;  #跳过一个事务
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| sql_slave_skip_counter | 1     |
+------------------------+-------+
MariaDB [(none)]> START SLAVE;

例如：

Slave错误发生时的状态:

MariaDB [(none)]> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.180.100
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000004
          Read_Master_Log_Pos: 658
               Relay_Log_File: relay-bin.000002
                Relay_Log_Pos: 601
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            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: 1008
                   Last_Error: Error ‘Can‘t drop database ‘test‘; database doesn‘t exist‘ on query. Default database: ‘test‘. Query: ‘drop database test‘
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 313
              Relay_Log_Space: 4079
              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: 1008
               Last_SQL_Error: Error ‘Can‘t drop database ‘test‘; database doesn‘t exist‘ on query. Default database: ‘test‘. Query: ‘drop database test‘
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
                   Using_Gtid: No
                  Gtid_IO_Pos: 
      Replicate_Do_Domain_Ids: 
  Replicate_Ignore_Domain_Ids: 
                Parallel_Mode: conservative

使用上面的方法使MySQL的Slave端复制恢复正常：

MariaDB [(none)]> STOP SLAVE;
MariaDB [(none)]> SET GLOBAL  SQL_SLAVE_SKIP_COUNTER=1;
MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE ‘SQL_SLAVE_SKIP_COUNTER‘;
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| sql_slave_skip_counter | 1     |
+------------------------+-------+
MariaDB [(none)]> START SLAVE;
MariaDB [(none)]> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.180.100
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000004
          Read_Master_Log_Pos: 658
               Relay_Log_File: relay-bin.000006
                Relay_Log_Pos: 537
        Relay_Master_Log_File: mysql-bin.000004
             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: 658
              Relay_Log_Space: 1526
              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: 1
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
                   Using_Gtid: No
                  Gtid_IO_Pos: 
      Replicate_Do_Domain_Ids: 
  Replicate_Ignore_Domain_Ids: 
                Parallel_Mode: conservative

到此，MySQL的主从复制恢复正常。。。大功告成