在myslq主从同步时，主库成功开启master服务，并将从库的master_log_pos=19500保持与主库相同
mysql> show master status\G *************************** 1. row *************************** File: mysql-bin.000002 Position: 19500 Binlog_Do_DB: hms Binlog_Ignore_DB: information_schema,mysql,yunbao_db 1 row in set (0.00 sec)
在启动从库salve服务时报错：
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.25.199.52
Master_User: slaveuser
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 19500
Relay_Log_File: iZ25fn41e46Z-relay-bin.000004
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000002
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB: hms
Replicate_Ignore_DB: information_schema,mysql,shopxx,yunbao_web_db,chni_web_db
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1062
Last_Error: Error 'Duplicate entry '0070900000247' for key 'PRIMARY'' on query. Default database: 'hms'. Query: 'insert into cus_customer (address, ascount, asstate, birthday, blid, bodycheckid, bodycheckname, cardtypeid, checkbodydata, citid, createtime, createuserid, CTypeId, cus_sou_device, cus_source, cuserid, cusername, cusstate, customername, cyid, directoruserid, directorusername...
Skip_Counter: 0
Exec_Master_Log_Pos: 107
Relay_Log_Space: 21614
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: 1062
......
分析操作步骤，查看到 Relay_Log_Pos的值与 Read_Master_Log_Pos 相差较大
可以判断由于从库启动后从 Relay_Log_Pos 位置读取日志向从库写入，而从库实际上数据已和主库同步，导致插入重复数据
解决：
重新设置master_log_pos即可
mysql> stop slave； mysql> change master to master_log_pos=19500； mysql> start slave; mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.25.199.52 Master_User: slaveuser Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 20544 Relay_Log_File: iZ25fn41e46Z-relay-bin.000002 Relay_Log_Pos: 1297 Relay_Master_Log_File: mysql-bin.000002 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: hms Replicate_Ignore_DB: information_schema,mysql,shopxx,yunbao_web_db,chni_web_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: 20544 Relay_Log_Space: 1460 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 1 row in set (0.00 sec)
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