mySQL Master not getting data from slave
I think you what you are describing is a replication topology called a Star Topology

I wrote about that before 


Apr 18, 2013 : Single slave - multiple master MySQL replication (Approach #1)
Apr 28, 2011 : MySQL in star topology (ServerFault)
Apr 26, 2011 : MySQL in star topology (Stack Overflow)


In that event, the Central Server must serve as a Slave in MySQL Replication paradigm until all changes in the binary logs of the Master (outside server) are pulled and executed in the Central Server.

If you pull the plug, replication breaks. It will lose its place.

MySQL does have a setting to control this in the CHANGE MASTER TO command. By default, the retry interval for MySQL 5.6 is 86400 seconds. That's 24 hours. Before MySQL 5.6, it was 60 seconds. To change the retry interval simply run,

STOP SLAVE;
CHANGE MASTER TO MASTER_CONNECT_RETRY = 60;
START SLAVE:


CAVEAT

Even if you pull the plug, it is possible for replication to lose its place and not reconnect because of incomplete transmission of binlog events. When that happens, you must reset the replication coordinates manually.

Here is how to fix replication manually in this regard:

Step 1: STOP SLAVE;

Step 2: SHOW SLAVE STATUS\G

Suppose the display looks like this

mysql&gt; show slave status\G
*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: 10.48.20.253
                Master_User: replicant
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: mysql-bin.000255
        Read_Master_Log_Pos: 858190247
             Relay_Log_File: relay-bin.066069
              Relay_Log_Pos: 873918
      Relay_Master_Log_File: mysql-bin.000254
           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: 858190247
            Relay_Log_Space: 873772
            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
1 row in set (0.00 sec)


Step 4: Record Relay_Master_Log_File and Exec_Master_Log_Pos

In this case, 'mysql-bin.000254' and 858190247

Step 5: Use Replication Coordinates from Step 4

CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000254',MASTER_LOG_POS=858190247;


Step 6: Start Replication

START SLAVE;


Give it a Try !!!