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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-967) TaskTracker does not need to fully unjar job jars
Date Fri, 11 Sep 2009 04:36:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753994#action_12753994
] 

Todd Lipcon commented on MAPREDUCE-967:
---------------------------------------

bq. Now that there are changes to RunJar, for trunk, can you move RunJar to mapreduce from
common

Sure thing. I'll take care of that when I post the patch for trunk.

bq. Also, I think, it will be good to make the filter to specify the directories/files in
job.jar to be un-jarred as configurable

Do you see any use for filters here beyond a straight regex? We can express the old behaviour
as /.*/ and the new behavior as /^(lib|classes)\//. Also, I'd prefer to make this an *undocumented*
configuration parameter, since I think there is very little use for the old version and we
don't want to encourage people to abuse this.

Would you see this being used as a per-job option or a TaskTracker-scoped option?

> 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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