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From Sandy Ryza <sandy.r...@cloudera.com>
Subject Re: Question regarding hadoop jar command usage
Date Wed, 13 Mar 2013 17:14:12 GMT
Hi Kay,

The jar is just executed locally.  If the jar fires up a mapreduce job and
sets itself as the job jar, then mapreduce will handle copying it to the
nodes that will use it.


On Wed, Mar 13, 2013 at 9:01 AM, KayVajj <vajjalak009@gmail.com> wrote:

> I have a question regarding the hadoop jar command. In a cluster of say
> nodes n1,n2...n100
> the node n1 has jar Myjar on its local file system.
> If I run the command
> hadoop jar local/path/to/Myjar Myclass other-args
> Is the MR job executed just on n1 or any arbitrary node n1..n100?
> If it is any arbitrary node, since Myjar exists only on n1. Is the jar
> copied across all nodes on the cluster to run the MR code.

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