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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-967) TaskTracker does not need to fully unjar job jars
Date Tue, 08 Dec 2009 14:09:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12787470#action_12787470
] 

Vinod K V commented on MAPREDUCE-967:
-------------------------------------

Your argument w.r.t the classpath (points 1 and 3) sounds reasonable. The newly added documentation
also mitigates some of my previous issues. Still, I think that with the default value for
the configuration property as {{(lib|classes)}} and not (.*), we need to mark this as incompatible
and the release note should clearly reflect the breakage of the streaming like use-cases(your
2nd point above) and the available work-around(the configuration property) as to how to get
everything unjarred.

Given that, the patch looks good to me. +1, pending commit of HADOOP-6346.


> 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, 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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