MySQL Last_Errno: 1396

MySQL 主备数据库切换报错1396处理方法，操作步骤如下：

mysql> show slave status \G;*************************** 1. row ***************************               Slave_IO_State: Waiting for master to send event                  Master_Host: 196.55.3.180                  Master_User: repl                  Master_Port: 3311                Connect_Retry: 60              Master_Log_File: mysql-bin.000002          Read_Master_Log_Pos: 1674               Relay_Log_File: relay-log.000002                Relay_Log_Pos: 367        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: 1396                   Last_Error: Error 'Operation CREATE USER failed for 'repl'@'%'' on query. Default database: ''. Query: 'CREATE USER 'repl'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*2813999EE1B5ABB4D8C2D12234F0649DF6A9BC19''                 Skip_Counter: 0          Exec_Master_Log_Pos: 154              Relay_Log_Space: 2217              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: NULLMaster_SSL_Verify_Server_Cert: No                Last_IO_Errno: 0                Last_IO_Error:                Last_SQL_Errno: 1396               Last_SQL_Error: Error 'Operation CREATE USER failed for 'repl'@'%'' on query. Default database: ''. Query: 'CREATE USER 'repl'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*2813999EE1B5ABB4D8C2D12234F0649DF6A9BC19''  Replicate_Ignore_Server_Ids:              Master_Server_Id: 10003                  Master_UUID: 84aa2159-14f8-11ea-bc00-00505687741b             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: 191204 19:51:57               Master_SSL_Crl:            Master_SSL_Crlpath:            Retrieved_Gtid_Set: 1b4e1296-14f7-11ea-8332-005056873bbd:1-2,84aa2159-14f8-11ea-bc00-00505687741b:1            Executed_Gtid_Set: 183c6bb2-5f65-11e9-b3cf-0050568745fc:1-8807                Auto_Position: 1         Replicate_Rewrite_DB:                  Channel_Name:            Master_TLS_Version: 1 row in set (0.00 sec)ERROR: No query specifiedmysql> show master status;+------------------+----------+--------------+------------------+---------------------------------------------+| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                           |+------------------+----------+--------------+------------------+---------------------------------------------+| mysql-bin.000006 |  5719971 |              |                  | 183c6bb2-5f65-11e9-b3cf-0050568745fc:1-8807 |+------------------+----------+--------------+------------------+---------------------------------------------+1 row in set (0.00 sec)mysql> select * from performance_schema.replication_applier_status_by_worker where LAST_ERROR_NUMBER=1396;+--------------+-----------+-----------+---------------+----------------------------------------+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+| CHANNEL_NAME | WORKER_ID | THREAD_ID | SERVICE_STATE | LAST_SEEN_TRANSACTION                  | LAST_ERROR_NUMBER | LAST_ERROR_MESSAGE                                                                                                                                                                                         | LAST_ERROR_TIMESTAMP |+--------------+-----------+-----------+---------------+----------------------------------------+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+|              |         0 |      NULL | OFF           | 1b4e1296-14f7-11ea-8332-005056873bbd:1 |              1396 | Error 'Operation CREATE USER failed for 'repl'@'%'' on query. Default database: ''. Query: 'CREATE USER 'repl'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*2813999EE1B5ABB4D8C2D12234F0649DF6A9BC19'' | 2019-12-04 20:02:13  |+--------------+-----------+-----------+---------------+----------------------------------------+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+1 row in set (0.00 sec)mysql> stop slave;Query OK, 0 rows affected (0.00 sec)mysql> set @@session.gtid_next='1b4e1296-14f7-11ea-8332-005056873bbd:1';Query OK, 0 rows affected (0.00 sec)mysql> begin;Query OK, 0 rows affected (0.00 sec)mysql> commit;Query OK, 0 rows affected (0.00 sec)mysql> set @@session.gtid_next=automatic;Query OK, 0 rows affected (0.00 sec)mysql> start slave;Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> show slave status\G;*************************** 1. row ***************************               Slave_IO_State: Waiting for master to send event                  Master_Host: 196.55.3.180                  Master_User: repl                  Master_Port: 3311                Connect_Retry: 60              Master_Log_File: mysql-bin.000002          Read_Master_Log_Pos: 1674               Relay_Log_File: relay-log.000005                Relay_Log_Pos: 494        Relay_Master_Log_File: mysql-bin.000002             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: 1674              Relay_Log_Space: 1154              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: 0Master_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: 10003                  Master_UUID: 84aa2159-14f8-11ea-bc00-00505687741b             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: 1b4e1296-14f7-11ea-8332-005056873bbd:1-2,84aa2159-14f8-11ea-bc00-00505687741b:1            Executed_Gtid_Set: 183c6bb2-5f65-11e9-b3cf-0050568745fc:1-8807,1b4e1296-14f7-11ea-8332-005056873bbd:1-2,84aa2159-14f8-11ea-bc00-00505687741b:1                Auto_Position: 1         Replicate_Rewrite_DB:                  Channel_Name:            Master_TLS_Version: 1 row in set (0.00 sec)ERROR: No query specifiedmysql>