1062错误----主键冲突，出现这种情况就是从库出现插入操作，主库又重新来了一遍，iothread没问题，sqlthread出错
解决方案：
从库操作
mysql> stop slave;
Query OK, 0 rowsaffected (0.26 sec)
mysql> set global sql_slave_skip_counter=1;
Query OK, 0 rowsaffected (0.30 sec)
mysql> start slave;
Query OK, 0 rowsaffected (0.04 sec)
mysql> show slavestatus\G
***************************1. row ***************************
Slave_IO_State: Waiting formaster to send event
Master_Host: 192.168.1.250
Master_User: mysync
Master_Port: 2503306
Connect_Retry: 60
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 2909
Relay_Log_File:HE1-relay-bin.000006
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000005
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: 2909
Relay_Log_Space: 1214
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: 2503306
Master_UUID:f7c96432-f665-11e5-943f-000c2967a454
Master_Info_File:/data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has readall relay log; waiting for the slave I/O thread to update it
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 (0.00sec)
故障模拟
从库如果误插入
mysql> insertinto helei(text) values('iii');
Query OK, 1 rowaffected (0.28 sec)
mysql> select *from helei;
+----+------+
| id | text |
+----+------+
| 1 | aa |
| 2 | bb |
| 3 | cc |
| 4 | ee |
| 5 | ff |
| 6 | gg |
| 7 | hh |
| 8 | iii |
+----+------+
8 rows in set (0.00sec)
mysql> show slavestatus\G
***************************1. row ***************************
Slave_IO_State: Waiting formaster to send event
Master_Host: 192.168.1.250
Master_User: mysync
Master_Port: 2503306
Connect_Retry: 60
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 2509
Relay_Log_File:HE1-relay-bin.000005
Relay_Log_Pos: 480
Relay_Master_Log_File: mysql-bin.000005
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
这时候从库是正常的，但由于从库私自插入数据，已经和主库不一致，如果这时主库也插入相同的数据
主库此时没有8,iii这条记录
mysql> select * from helei;
+----+------+
| id | text |
+----+------+
| 1 | aa |
| 2 | bb |
| 3 | cc |
| 4 | ee |
| 5 | ff |
| 6 | gg |
| 7 | hh |
+----+------+
7 rows in set (0.00sec)
mysql>show slave status\G
***************************1. row ***************************
Slave_IO_State: Waiting formaster to send event
Master_Host: 192.168.1.250
Master_User: mysync
Master_Port: 2503306
Connect_Retry: 60
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 2709
Relay_Log_File:HE1-relay-bin.000005
Relay_Log_Pos: 480
Relay_Master_Log_File: mysql-bin.000005
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: 1062
Last_Error: Could not execute Write_rows event on table test.helei;Duplicate entry '8' for key 'PRIMARY', Error_code: 1062; handler errorHA_ERR_FOUND_DUPP_KEY; the event's master log mysql-bin.000005, end_log_pos2678
Skip_Counter: 0
Exec_Master_Log_Pos: 2509
Relay_Log_Space: 851
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
Last_SQL_Error: Could notexecute Write_rows event on table test.helei; Duplicate entry '8' for key'PRIMARY', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event'smaster log mysql-bin.000005, end_log_pos 2678
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2503306
Master_UUID:f7c96432-f665-11e5-943f-000c2967a454
Master_Info_File:/data/mysql/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: 160331 09:12:02
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row inset (0.00 sec)