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https://issues.apache.org/jira/browse/MAPREDUCE-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452111#comment-13452111
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Robert Joseph Evans commented on MAPREDUCE-4647:
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Actually I do think I will do it in a generic way through YARN. I have taken a
closer look at MAPREDUCE-967, and I see that mapreduce.job.jar.unpack.pattern
is a user visible config that is now unused, so that is a regression. I am not
really sure how big of a change this is going to require though, but hopefully
it will not be too large.
> 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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