mysql主从复制不能同步

Question

本来一直是好的，昨天2台机器重启了，就不行了。我重新把主数据库copy到从数据库，刚开始也是好的，过了一会就不行了。

主的位置点是259972 从的位置点是241303 但是不能复制了。

显示的Slave_IO_Running: Yes
Slave_SQL_Running: Yes

下面是从的详细信息
mysql> show slave status G
1. row **

           Slave_IO_State: Waiting for master to send event
              Master_User: root
              Master_Port: 3306
            Connect_Retry: 60
          Master_Log_File: mysqlmaster-bin.000004
      Read_Master_Log_Pos: 241310
           Relay_Log_File: localhost-relay-bin.000005
            Relay_Log_Pos: 11096
    Relay_Master_Log_File: mysqlmaster-bin.000004
         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: 241310
          Relay_Log_Space: 12338
          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: 8489eb39-a174-11e6-afad-00155dae02a1
         Master_Info_File: /data/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

Answer 1

是否有人知道呀，我把从数据库都删了，重新设置。刚开始几分钟 可以复制。过一会又不行了。 但是Slave_IO_Running: YesSlave_SQL_Running: Yes。这是什么情况

从库日志有报错 好像是连接断开
2016-12-27 09:41:23 9547 [ERROR] Error reading packet from server: Lost connection to MySQL server during query ( server_errno=2013)
2016-12-27 09:41:23 9547 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysqlmaster-bin.000005' at position 393