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Posted to mapreduce-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2009/09/10 08:26:58 UTC

[jira] Created: (MAPREDUCE-967) TaskTracker does not need to fully unjar job jars

TaskTracker does not need to fully unjar job jars
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                 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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