[jira] [Created] (MAPREDUCE-4647) We should only unjar jobjar if there is a lib directory in it.

["Robert Joseph Evans (JIRA)" <ji...@apache.org>]

Robert Joseph Evans created MAPREDUCE-4647:
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             Summary: 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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