mysql在执行start slave命令时报错”ERROR 1872 (HY000)”

问题描述：mysql在执行start slave命令时报错"ERROR 1872 (HY000)"，如下所示：
数据库：mysql 8.0.27
系统：rhel 7.3
1、问题重现
mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository
2、异常原因
从库已经存在之前的relay log.
3、解决方案
使用reset slave语句，清除master信息和relay日志信息，并创建全新的中继日志.
mysql> stop slave;
Query OK, 0 rows affected, 2 warnings (0.00 sec)

mysql> reset slave;
Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> change master to master_host='192.168.133.111',master_user='repluser',master_password='123456',master_log_file='master_bin.000001',MASTER_LOG_POS=957;
Query OK, 0 rows affected, 8 warnings (0.02 sec)

mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> show slave status G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for source to send event
                  Master_Host: 192.168.133.111
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master_bin.000001
          Read_Master_Log_Pos: 957
               Relay_Log_File: relay-log.000002
                Relay_Log_Pos: 325
        Relay_Master_Log_File: master_bin.000001
             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: 957
              Relay_Log_Space: 528
              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_UUID: 3393dd41-fb9f-11ed-a80f-000c291140b1
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Replica 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: 
            Executed_Gtid_Set: 
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
       Master_public_key_path: 
        Get_master_public_key: 1
            Network_Namespace: 
1 row in set, 1 warning (0.00 sec)

mysql> show warnings;
+---------+------+-------------------------------------------------------------------------------------------------------------------+
| Level   | Code | Message                                                                                                           |
+---------+------+-------------------------------------------------------------------------------------------------------------------+
| Warning | 1287 | 'SHOW SLAVE STATUS' is deprecated and will be removed in a future release. Please use SHOW REPLICA STATUS instead |
+---------+------+-------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

说明：如上所示，成功开启从库.

参考网址：https://blog.csdn.net/weixin_45412401/article/details/114795395