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slave的中继日志relay-log损坏

2022-07-16 17:16:01
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    当slave意外宕机时,有可能会损坏中继日志relay-log,再次开启同步复制时,会出现报错。
    解决方法:找到同步的binlog日志和POS点,然后重新进行同步,这样就可以有新的中继日志了。
    下边看个案例,模拟了中继日志损坏的情况,查看到的信息如下:
  点击(此处)折叠或打开
 
  mysql> show slave status /G
  ERROR 2006 (HY000): MySQL server has gone away
  No connection. Trying to reconnect...
  Connection id: 4
  Current database: test
 
  *************************** 1. row ***************************
                 Slave_IO_State: Waiting for master to send event
                    Master_Host: 10.10.10.200
                    Master_User: repl
                    Master_Port: 3306
                  Connect_Retry: 60
                Master_Log_File: mysql-bin.000005
            Read_Master_Log_Pos: 220
                 Relay_Log_File: mysql-relay-bin.000010
                  Relay_Log_Pos: 283
          Relay_Master_Log_File: mysql-bin.000004
               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: 1032
                     Last_Error: Could not execute Update_rows event on table test.test01; Can't find record in 'test01', Error_code: 1032; handler error HA_ERR_END_OF_FILE; the event's master log mysql-bin.000004, end_log_pos 310
                   Skip_Counter: 0
            Exec_Master_Log_Pos: 120
                Relay_Log_Space: 2251
                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 Update_rows event on table test.test01; Can't find record in 'test01', Error_code: 1032; handler error HA_ERR_END_OF_FILE; the event's master log mysql-bin.000004, end_log_pos 310
    Replicate_Ignore_Server_Ids:
               Master_Server_Id: 1
                    Master_UUID: 4adfcd1d-4059-11e7-9532-080027d597f9
               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: 170808 11:45:26
                 Master_SSL_Crl:
             Master_SSL_Crlpath:
             Retrieved_Gtid_Set:
              Executed_Gtid_Set:
                  Auto_Position: 0
    其中,涉及几个重要的参数:
  slave_IO_Running:接受master的binlog的信息
  master_Log_file:正在读取master上binlog日志名
  Read_master_Log_Pos:正在读取master上当前binlog日志POS点。
  slave_SQL_Running:执行写操作
  Relay_master_Log_File:正在同步master上的binlog日志名。
  Exec_master_Log_Pos:正在同步当前binlog日志的POS点。
   以Relay_master_Log_File参数值和Exec_master_Log_Pos参数值为基准。
  Relay_Log_File: mysql-relay-bin.000010
  Relay_Log_Pos: 283
    接下来开始重置主从复制:
  点击(此处)折叠或打开
 
  mysql> stop slave;
  Query OK, 0 rows affected (0.04 sec)
 
  mysql> change master to master_log_file='mysql-relay-bin.000010',master_log_pos=283;
  Query OK, 0 rows affected (0.06 sec)
 
  mysql> start slave;
  Query OK, 0 rows affected (0.12 sec)
    通过这种方法可以修复中继日志,但是在MySQL5.5版本之后,在slave的my.cnf配置文件中加入relay_log_recovery=1就可以了。

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