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Date: Tue, 11 Sep 2012 04:53:07 +1100 (NCT)
From: "Robert Joseph Evans (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4647) We should only unjar jobjar if
 there is a lib directory in it.
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452241#comment-13452241 ] 

Robert Joseph Evans commented on MAPREDUCE-4647:
------------------------------------------------

I wanted to add in too that it looks like MAPREDUCE-3018 removed part of MAPREDUCE-967 from streaming too, because YARN did not support this.
                
> We should only unjar jobjar if there is a lib directory in it.
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-4647
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4647
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 0.23.3
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>
> For backwards compatibility we recently added made is so we would unjar the job.jar and add anything to the classpath in the lib directory of that jar.  But this also slows job startup down a lot if the jar is large.  We should only unjar it if actually doing so would add something new to the classpath.

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