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https://issues.apache.org/jira/browse/MAPREDUCE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754003#action_12754003
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Vinod K V commented on MAPREDUCE-967:
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bq. Now that there are changes to RunJar, for trunk, can you move RunJar to
mapreduce from common
bq. Sure thing. I'll take care of that when I post the patch for trunk.
Thanks! Please also make sure the new class in mapreduce is in
org.apache.hadoop.mapreduce.util and create a deprecate class in
org.apache.hadoop.util which uses functionality from
org.apache.hadoop.mapreduce.util.RunJar.
bq. 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)\//.
Yes, that should do, I think.
bq. 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.
Agreed. Even now, it is undocumented, AFAIK. A more appropriate reasoning for
making it a configuration is that some users may want directories other than
lib or classes to be unjarred.
bq. Would you see this being used as a per-job option or a TaskTracker-scoped
option?
Per-job. By the time, we un-jar stuff on the TT, job configuration is already
localized, so it's easy to get this option just before un-jarring.
> 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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