Re: purpose of JobTracker copying job.jar

[Arun C Murthy]

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.