The job file i.e job.jar is copied to the dfs by the job client. When the task tracker prepares for new task it makes a local copy of the job.
On Sat, 8 Mar 2008, Ben Kucinich wrote:

I am interested to know the internal working of Hadoop regarding
distribution of jobs. How are the jobs copied to other nodes?

Is the class file copied to all other nodes where they are executed?
Yes.
Btw I think this should be posted on core-dev!
Amar

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