mmm 主从复制机制排错过程

一. 主机器发出一个sql，导致所有的从机同步出错的问题解决流程

a.)进入从机的mysql控制台

b.) 查看复制进程的信息

mysql> show slave status\G

c.) 关注以下3个key及其内容

Master_Host：192.168.1.212

Relay_Master_Log_File：mysql-master-001-bin.000348

Exec_Master_Log_Pos：330637

*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.1.212
                  Master_User: replication
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-master-001-bin.000348
          Read_Master_Log_Pos: 330637
               Relay_Log_File: mysql-slave-001-bin.000345
                Relay_Log_Pos: 4
        Relay_Master_Log_File: mysql-master-001-bin.000348
             Slave_IO_Running: No
            Slave_SQL_Running: Yes
              Replicate_Do_DB: meerkat
          Replicate_Ignore_DB: mysql,information_schema
           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: 330637
              Relay_Log_Space: 151
              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: 1236
                Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 2
                  Master_UUID: 3d3b9f4f-f74f-11e5-9a30-005056b324c4
             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 the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp: 160719 14:16:46
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set: 3d3b9f4f-f74f-11e5-9a30-005056b324c4:1-22:26-3944,
40844d86-f74f-11e5-9a30-005056b370b3:1-4,
73ae7f45-f74c-11e5-9a1e-005056b3294e:1-27485277:27485279-27487144
                Auto_Position: 0
1 row in set (0.00 sec)

d.) 根据上面的3个可以的内容，修复同步

mysql> stop slave ;
mysql> CHANGE MASTER TO MASTER_HOST='192.168.1.212', MASTER_LOG_FILE='mysql-master-001-bin.000348',  MASTER_LOG_POS=330637 , MASTER_AUTO_POSITION = 0 ;
mysql> start slave ;
mysql> show slave status\G