mysql主从复制跳过错误项

mysql主从复制，经常会遇到错误而导致slave端复制中断，这个时候一般就需要人工干预，跳过错误才能继续

1 命令行

1.1 普通主从复制

跳过指定数量的事务：

mysql>stop slave;
mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;        #跳过一个事务
mysql>start slave;

• 例 下面模拟一个错误场景 环境（一个已经配置好的主从复制环境） master数据库IP：192.168.247.128 slave数据库IP：192.168.247.130 mysql版本：5.6.14 binlog-do-db = mydb

在master上执行以下语句：

mysql>use mysql;
mysql>create table t1 (id int);
mysql>use mydb;
mysql>insert into mysql.t1 select 1;

在slave上查看复制状态

mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.247.128
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000017
          Read_Master_Log_Pos: 2341
               Relay_Log_File: DBtest1-relay-bin.000011
                Relay_Log_Pos: 494
        Relay_Master_Log_File: mysql-bin.000017
             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: 1146
                   Last_Error: Error 'Table 'mysql.t1' doesn't exist' on query. Default database: 'mydb'. Query: 'insert into mysql.t1 select 1'
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 1919
              Relay_Log_Space: 1254
              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: 1146
               Last_SQL_Error: Error 'Table 'mysql.t1' doesn't exist' on query. Default database: 'mydb'. Query: 'insert into mysql.t1 select 1'
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
                  Master_UUID: f0f7faf6-51a8-11e3-9759-000c29eed3ea
             Master_Info_File: /var/lib/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: 131210 21:37:19
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
1 row in set (0.00 sec)

由结果可以看到，Read_Master_Log_Pos: 2341，Exec_Master_Log_Pos: 1919 时出错了Last_SQL_Error: Error 'Table 'mysql.t1' doesn't exist' on query. 因为只对mydb记录了binlog,当在mydb库操作其它数据库的表，但该表在slave上又不存在时就出错了。

我们可在看看binlog里的事务内容，这里一行代表一个事务

mysql> SHOW BINLOG EVENTS in 'mysql-bin.000017' from 1919\G
*************************** 1. row ***************************
   Log_name: mysql-bin.000017
        Pos: 1919
 Event_type: Query
  Server_id: 1
End_log_pos: 1999
       Info: BEGIN
*************************** 2. row ***************************
   Log_name: mysql-bin.000017
        Pos: 1999
 Event_type: Query
  Server_id: 1
End_log_pos: 2103
       Info: use `mydb`; insert into mysql.t1 select 1
*************************** 3. row ***************************
   Log_name: mysql-bin.000017
        Pos: 2103
 Event_type: Xid
  Server_id: 1
End_log_pos: 2134
       Info: COMMIT /* xid=106 */
*************************** 4. row ***************************
   Log_name: mysql-bin.000017
        Pos: 2134
 Event_type: Query
  Server_id: 1
End_log_pos: 2213
       Info: BEGIN
*************************** 5. row ***************************
   Log_name: mysql-bin.000017
        Pos: 2213
 Event_type: Query
  Server_id: 1
End_log_pos: 2310
       Info: use `mydb`; insert into t1 select 9
*************************** 6. row ***************************
   Log_name: mysql-bin.000017
        Pos: 2310
 Event_type: Xid
  Server_id: 1
End_log_pos: 2341
       Info: COMMIT /* xid=107 */
6 rows in set (0.00 sec)

由上面的结果可知，我们需要跳过两个事务（Pos: 1999 insert,Pos: 2103 commit) 跳过操作：

mysql>stop slave;
mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 2;        跳过两个事务
mysql>start slave;
mysql> show slave status\G
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    3
Current database: mydb

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.247.128
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000017
          Read_Master_Log_Pos: 3613
               Relay_Log_File: DBtest1-relay-bin.000018
                Relay_Log_Pos: 283
        Relay_Master_Log_File: mysql-bin.000017
             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: 3613
              Relay_Log_Space: 458
              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
                  Master_UUID: f0f7faf6-51a8-11e3-9759-000c29eed3ea
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all 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 (0.01 sec)

复制状态正常。

1.2 GTID复制

在从库slave查看主从复制状态

root@NUC-10 11:17:  [(none)]> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.20.68
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000149
          Read_Master_Log_Pos: 1070169624
               Relay_Log_File: relay-bin.000119
                Relay_Log_Pos: 3634
        Relay_Master_Log_File: mysql-bin.000126
             Slave_IO_Running: Yes
            Slave_SQL_Running: No
              Replicate_Do_DB:
          Replicate_Ignore_DB: mysql
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 1032
                   Last_Error: Could not execute Delete_rows event on table jira.rundetails; Can't find record in 'rundetails', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.000126, end_log_pos 206688887
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 206688582
              Relay_Log_Space: 27355739467
              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: 1032
               Last_SQL_Error: Could not execute Delete_rows event on table jira.rundetails; Can't find record in 'rundetails', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.000126, end_log_pos 206688887
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 68
                  Master_UUID: 7d66c13f-41f0-11e7-aff4-f44d306bf92c
             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: 190219 11:17:42
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set: 7d66c13f-41f0-11e7-aff4-f44d306bf92c:147462344-184441732
            Executed_Gtid_Set: 7d66c13f-41f0-11e7-aff4-f44d306bf92c:1-147462351
                Auto_Position: 1
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

停止slave进程

mysql> STOP SLAVE;

设置事务号，事务号从Retrieved_Gtid_Set获取，在session里设置gtid_next，即跳过这个GTID

mysql> SET @@SESSION.GTID_NEXT= '7d66c13f-41f0-11e7-aff4-f44d306bf92c:147462352'

设置空事物

mysql> BEGIN; COMMIT;

恢复事物号

mysql> SET SESSION GTID_NEXT = AUTOMATIC;

启动slave进程

mysql> START SLAVE;

2 修改mysql的配置文件

通过slave_skip_errors参数来跳所有错误或指定类型的错误

vim /etc/my.cnf
[mysqld]
#slave-skip-errors=1062,1053,1146 #跳过指定error no类型的错误
#slave-skip-errors=all #跳过所有错误