MySQL GTID复制错误处理之跳过错误

某Slave报错音讯:

mysql> show slave status\G;

MySQL 1MySQL 2

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.206.140
                  Master_User: u_repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 499
               Relay_Log_File: localhost-relay-bin.000002
                Relay_Log_Pos: 367
        Relay_Master_Log_File: mysql-bin.000001
             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: 1007
                   Last_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '9e2c7c0f-0908-11e7-8230-000c29ab7544:1' at master log mysql-bin.000001, end_log_pos 313. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any.
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 154
              Relay_Log_Space: 1513
              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: 1007
               Last_SQL_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '9e2c7c0f-0908-11e7-8230-000c29ab7544:1' at master log mysql-bin.000001, end_log_pos 313. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any.
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 140
                  Master_UUID: 9e2c7c0f-0908-11e7-8230-000c29ab7544
             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: 170316 04:25:29
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 9e2c7c0f-0908-11e7-8230-000c29ab7544:1-2
            Executed_Gtid_Set: 347cbac6-0906-11e7-b957-000c2981a46e:1,
c59a2526-08fd-11e7-a5c7-000c296f2953:1-2
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

ERROR: 
No query specified

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MySQL,GTID的复制对于错误音讯的可读性不是很好,但足以透过错误代码(1007)从监控表replication_applier_status_by_worker查看:

mysql> select * from performance_schema.replication_applier_status_by_worker where LAST_ERROR_NUMBER=1007\G

MySQL 3MySQL 4

mysql> select * from performance_schema.replication_applier_status_by_worker where LAST_ERROR_NUMBER=1007\G
*************************** 1. row ***************************
         CHANNEL_NAME: 
            WORKER_ID: 2
            THREAD_ID: NULL
        SERVICE_STATE: OFF
LAST_SEEN_TRANSACTION: 9e2c7c0f-0908-11e7-8230-000c29ab7544:1
    LAST_ERROR_NUMBER: 1007
   LAST_ERROR_MESSAGE: Worker 1 failed executing transaction '9e2c7c0f-0908-11e7-8230-000c29ab7544:1' at master log mysql-bin.000001, end_log_pos 313; Error 'Can't create database 'mydb'; database exists' on query. Default database: 'mydb'. Query: 'create database mydb'
 LAST_ERROR_TIMESTAMP: 2017-03-16 04:25:29
1 row in set (0.00 sec)

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使用GTID跳过荒唐的艺术:找到错误的GTID跳过(通过Exec_Master_Log_Pos去binlog里找GTID,或则通过地点监控表replication_applier_status_by_worker找到GTID,也足以通过Executed_Gtid_Set算出GTID),那里运用监控表来找到错误的GTID。找到GTID之后,跳过荒唐的步骤

mysql> stop slave; #停止同步
Query OK, 0 rows affected (0.02 sec)

mysql> set @@session.gtid_next='9e2c7c0f-0908-11e7-8230-000c29ab7544:1';  #跳过错误的GTID
Query OK, 0 rows affected (0.00 sec)

mysql> begin; #提交一个空事务,因为设置gtid_next后,gtid的生命周期就开始了,必须通过显性的提交一个事务来结束,否则报错:ERROR 1790 (HY000): @@SESSION.GTID_NEXT cannot be changed by a client that owns a
Query OK, 0 rows affected (0.00 sec)

mysql> commit;
Query OK, 0 rows affected (0.01 sec)

mysql> set @@session.gtid_next=automatic; #设置回自动模式  
Query OK, 0 rows affected (0.00 sec)

mysql> start slave;
Query OK, 0 rows affected (0.02 sec)

重复肯定slave同步情形

mysql> show slave status\G;

MySQL 5MySQL 6

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.206.140
                  Master_User: u_repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 499
               Relay_Log_File: localhost-relay-bin.000004
                Relay_Log_Pos: 454
        Relay_Master_Log_File: mysql-bin.000002
             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: 499
              Relay_Log_Space: 2024
              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: 140
                  Master_UUID: 9e2c7c0f-0908-11e7-8230-000c29ab7544
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave 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: 9e2c7c0f-0908-11e7-8230-000c29ab7544:1-2
            Executed_Gtid_Set: 347cbac6-0906-11e7-b957-000c2981a46e:1,
9e2c7c0f-0908-11e7-8230-000c29ab7544:1-2,
c59a2526-08fd-11e7-a5c7-000c296f2953:1-2
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

ERROR: 
No query specified

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打完收工

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