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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-967) TaskTracker does not need to fully unjar job jars
Date Thu, 10 Sep 2009 06:26:58 GMT
TaskTracker does not need to fully unjar job jars
-------------------------------------------------

                 Key: MAPREDUCE-967
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-967
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: tasktracker
    Affects Versions: 0.21.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


In practice we have seen some users submitting job jars that consist of 10,000+ classes. Unpacking
these jars into mapred.local.dir and then cleaning up after them has a significant cost (both
in wall clock and in unnecessary heavy disk utilization). This cost can be easily avoided

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