比如，在有些场景，我们需要下线一台slave，我们使用reset slave来清除show slave status \G里边的同步信息，当我们执行完show slave status \G之后，需要可以看到里边的信息。
执行reset slave，其实是把master.info和relay-log.info文件给删除，但是里边的同步信息还在.

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mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)
mysql> reset slave;
Query OK, 0 rows affected (0.06 sec)
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 10.10.10.200
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: mysql-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
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: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 143
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: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 4adfcd1d-4059-11e7-9532-080027d597f9
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:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)

如果有人误开始了start slave，同步依然会开始进行，我们需要用以下这个方法清除的更彻底。

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mysql> reset slave all;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G
Empty set (0.00 sec)

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干净的清除slave同步信息

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