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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4647) We should only unjar jobjar if there is a lib directory in it.
Date Mon, 10 Sep 2012 16:20:07 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452111#comment-13452111
] 

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

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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