今天在优化io的时候，移动了从库relay-bin的位置，并将hostname部分去掉了，启动后，从库slave状态如下：
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 127.0.0.1
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000226
Read_Master_Log_Pos: 175251675
Relay_Log_File: iZ23nn1p4mjZ-relay-bin.000464
Relay_Log_Pos: 175251629
Relay_Master_Log_File: mysql-bin.000226
Slave_IO_Running: No
Slave_SQL_Running: No
Replicate_Do_DB: db_rsk,db_sys
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table: db_rsk.tb_act_unitequitiesposition,db_rsk.tb_act_productposition,db_rsk.tb_act_productunitasset,db_rsk.tb_act_productaccount,db_rsk.tb_act_unitaccount,db_rsk.tb_act_operationconfig,db_rsk.tb_rsk_assetvaluecompliance,db_rsk.tb_rsk_stockcostcompliance,db_rsk.tb_rsk_stockpoolcompliance,db_rsk.tb_rsk_stockquantitycompliance,db_rsk.tb_rsk_stockvaluecompalince,db_rsk.tb_rsk_tradelimitcompliance,db_rsk.tb_rsk_reversetradecompliance,db_rsk.tb_rsk_navcompliance,db_rsk.tb_rsk_rulescompliancecode,db_rsk.tb_rsk_usernavsection,db_rsk.tb_rsk_complianceset,db_rsk.tb_rsk_customdimensionstock,db_rsk.tb_rsk_customdimensiontype,db_rsk.tb_rsk_indexstock,db_rsk.tb_rsk_indextype,db_rsk.tb_rsk_industryclassification,db_rsk.tb_rsk_industrystock,db_rsk.tb_rsk_industrytype,db_rsk.tb_rsk_userdimensionstock,db_rsk.tb_rsk_userdimensiontype,db_rsk.tb_rsk_productmonitorset,db_rsk.tb_rsk_stockmonitorset,db_sys.tb_sys_bond_info,db_sys.tb_sys_code_map,db_sys.tb_sys_company,db_sys.tb_sys_dictionary,db_sys.tb_sys_exchange_info,db_sys.tb_sys_function_info,db_sys.tb_sys_menu,db_sys.tb_sys_menu_function,db_sys.tb_sys_operator,db_sys.tb_sys_operator_company,db_sys.tb_sys_operator_menu,db_sys.tb_sys_operator_parameter,db_sys.tb_sys_operator_role,db_sys.tb_sys_operator_unit,db_sys.tb_sys_order_direction,db_sys.tb_sys_parameter,db_sys.tb_sys_role,db_sys.tb_sys_role_menu,db_sys.tb_sys_stock_type,db_sys.tb_sys_system_info,db_sys.tb_sys_trade_date,db_sys.tb_sys_trade_time,db_sys.tb_sys_task_ex
Replicate_Wild_Ignore_Table:
Last_Errno: 1872
Last_Error: Slave failed to initialize relay log info structure from the repository
Skip_Counter: 0
Exec_Master_Log_Pos: 175251424
Relay_Log_Space: 0
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: 1872
Last_SQL_Error: Slave failed to initialize relay log info structure from the repository
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID: 96b464e1-b68f-11e6-8321-00163f00368a
Master_Info_File: /usr/local/Percona-Server-5.7.16-10-Linux.x86_64.ssl101/data2/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: 170314 19:34:56
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB: (db_act,db_rsk)
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec) ERROR:
No query specified
使用start slave命令开启失败：
mysql> start slave；
ERROR 1872 (HY000)： Slave failed to initialize relay log info structure from the repository
使用reset slave命令解决：
mysql> reset slave；
Query OK， 0 rows affected (0.01 sec)
mysql> start slave；
Query OK， 0 rows affected (0.03 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Queueing master event to the relay log
Master_Host: 127.0.0.1
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000223
Read_Master_Log_Pos: 62998
Relay_Log_File: relay-bin.000003
Relay_Log_Pos: 11565
Relay_Master_Log_File: mysql-bin.000223
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: db_rsk,db_sys
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table: db_rsk.tb_act_unitequitiesposition,db_rsk.tb_act_productposition,db_rsk.tb_act_productunitasset,db_rsk.tb_act_productaccount,db_rsk.tb_act_unitaccount,db_rsk.tb_act_operationconfig,db_rsk.tb_rsk_assetvaluecompliance,db_rsk.tb_rsk_stockcostcompliance,db_rsk.tb_rsk_stockpoolcompliance,db_rsk.tb_rsk_stockquantitycompliance,db_rsk.tb_rsk_stockvaluecompalince,db_rsk.tb_rsk_tradelimitcompliance,db_rsk.tb_rsk_reversetradecompliance,db_rsk.tb_rsk_navcompliance,db_rsk.tb_rsk_rulescompliancecode,db_rsk.tb_rsk_usernavsection,db_rsk.tb_rsk_complianceset,db_rsk.tb_rsk_customdimensionstock,db_rsk.tb_rsk_customdimensiontype,db_rsk.tb_rsk_indexstock,db_rsk.tb_rsk_indextype,db_rsk.tb_rsk_industryclassification,db_rsk.tb_rsk_industrystock,db_rsk.tb_rsk_industrytype,db_rsk.tb_rsk_userdimensionstock,db_rsk.tb_rsk_userdimensiontype,db_rsk.tb_rsk_productmonitorset,db_rsk.tb_rsk_stockmonitorset,db_sys.tb_sys_bond_info,db_sys.tb_sys_code_map,db_sys.tb_sys_company,db_sys.tb_sys_dictionary,db_sys.tb_sys_exchange_info,db_sys.tb_sys_function_info,db_sys.tb_sys_menu,db_sys.tb_sys_menu_function,db_sys.tb_sys_operator,db_sys.tb_sys_operator_company,db_sys.tb_sys_operator_menu,db_sys.tb_sys_operator_parameter,db_sys.tb_sys_operator_role,db_sys.tb_sys_operator_unit,db_sys.tb_sys_order_direction,db_sys.tb_sys_parameter,db_sys.tb_sys_role,db_sys.tb_sys_role_menu,db_sys.tb_sys_stock_type,db_sys.tb_sys_system_info,db_sys.tb_sys_trade_date,db_sys.tb_sys_trade_time,db_sys.tb_sys_task_ex
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 11360
Relay_Log_Space: 63396
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0