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https://issues.apache.org/jira/browse/MAPREDUCE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796712#action_12796712
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Hudson commented on MAPREDUCE-967:
----------------------------------
Integrated in Hadoop-Mapreduce-trunk #196 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Mapreduce-trunk/196/])
> 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
> Fix For: 0.22.0
>
> Attachments: mapreduce-967-branch-0.20.txt, mapreduce-967.txt,
> mapreduce-967.txt, mapreduce-967.txt, mapreduce-967.txt, mapreduce-967.txt,
> mapreduce-967.txt
>
>
> 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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