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https://issues.apache.org/jira/browse/MAPREDUCE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated MAPREDUCE-967:
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Attachment: mapreduce-967-branch-0.20.txt
Tested this manually by unjarring the examples jar, creating a new jar
'lib/sleep.jar' with all of the inner classes of SleepJob, removing them from
the outer jar, and jarring it back up. This job ran correctly, and while it was
running I investigated jobCache/<job_id>/jars to verify that the classes had
not been unpacked, but lib/sleep.jar had been.
> 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
> Attachments: mapreduce-967-branch-0.20.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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