mysql做主从报错 - Last_SQL_Errno: 1064

错误详情

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.11.159.138
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 91238
               Relay_Log_File: mysql-relay-bin.000006
                Relay_Log_Pos: 612
        Relay_Master_Log_File: mysql-bin.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: No
              Replicate_Do_DB: dataxweb
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 1064
                   Last_Error: Error 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by 'password'' at line 1' on query. Default database: ''. Query: 'grant replication slave on *.* to 'root'@'10.11.159.91' identified by 'password''
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 413
              Relay_Log_Space: 91693
              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: 1064
               Last_SQL_Error: Error 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by 'password'' at line 1' on query. Default database: ''. Query: 'grant replication slave on *.* to 'root'@'10.11.159.91' identified by 'password''
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
                  Master_UUID:
             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: 200915 19:36:44
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
       Master_public_key_path:
        Get_master_public_key: 0
            Network_Namespace:
1 row in set (0.00 sec)

错误原因

mysql做主从的过程中，由于主库中执行了grant replication slave on *.* to 'root'@'<slave_ip>' identified by 'password'赋权操作，而主库写入了binlog。从库拿到binlog之后，也执行了这句，从库是不可以执行grant replication slave，所以导致的报错。

解决办法

跳过这条错误

mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)

mysql> SET GLOBAL sql_slave_skip_counter=1;
Query OK, 0 rows affected (0.00 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

这就像抄作业，从库只顾着“抄作业”，而不管是不是正确的，导致了这个错误。
遇到错误不要着急，冷静分析。