job tracker should refuse connection from a task tracker with a different 
version number
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         Key: HADOOP-236
         URL: http://issues.apache.org/jira/browse/HADOOP-236
     Project: Hadoop
        Type: Bug

  Components: mapred  
    Versions: 0.2.1    
    Reporter: Hairong Kuang


After one mapred system upgrade, we noticed that all tasks assigned to one task 
tracker failed. It turned out that for some reason the task tracker was not 
upgraded.

To avoid this, a task tracker should reports its version # when it registers 
itsself with a job tracker. If the job tracker receives an inconsistent version 
#, it should refuse the connection.

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