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From Arun C Murthy <...@yahoo-inc.com>
Subject Re: purpose of JobTracker copying job.jar
Date Wed, 27 Apr 2011 18:20:26 GMT
So that it can instruct TTs to copy it from the system-dir for  
actually running jobs...

hope that helps,
Arun

On Apr 26, 2011, at 11:57 AM, Raghu Angadi wrote:

>
> Job tracker copies job jar from mapred system directory on HDFS to  
> its local file system ( ${mapred.local.dir}/jobTracker ).
>
> What is the purpose of copying this file? It does not run any user  
> code.
>
> thanks,
> Raghu.
>


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