mysql 主从复制binlog不同步

Question

环境是两台服务器做的主主备份,A服务器从B服务器同步的时候会遇到状态都正常就是A服务器的Read_Master_Log_Pos和B服务器的不一致,相差200多万, B服务器从A服务器复制一切正常.

相关信息如下:
A服务器的show slave statusG的结果

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.100.100
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000005
          Read_Master_Log_Pos: 211001228
               Relay_Log_File: iZ23rdfmxjuZ-relay-bin.000034
                Relay_Log_Pos: 2651540
        Relay_Master_Log_File: mysql-bin.000005
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: 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: 211001228
              Relay_Log_Space: 70547558
              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: 180
                  Master_UUID: d69b94b2-c40d-11e6-914b-c80aa98819df
             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

B服务器上的show master status;

mysql> show master status\G;
*************************** 1. row ***************************
             File: mysql-bin.000005
         Position: 212286606
     Binlog_Do_DB: l4d2_wykh
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 
1 row in set (0.02 sec)

Slave_IO_Running 和 Slave_SQL_Running 都正常只有pos出现不一致的问题

目前临时解决办法是在A服务器上stop slave然后start slave就好了,重启slave就会进行同步.

Answer 1

发现问题了，是因为主服务器那边show processlist中没有从服务器的连接