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https://issues.apache.org/jira/browse/MAPREDUCE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758987#action_12758987
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Vinod K V commented on MAPREDUCE-967:
-------------------------------------
Following the way we did this elsewhere (MAPREDUCE-711), we should
- remove the old class _org.apache.hadoop.util.RunJar_ completely from the
common project,
- move the code completely to a new class
_org.apache.hadoop.mapreduce.util.RunJar_ in mapreduce project
- for supporting deprecation, create a new class in
_org.apache.hadoop.util.RunJar_ in mapreduce project which is just a
placeholder and redirects all the functionality to the class in
_org.apache.hadoop.mapreduce.util.RunJar_. This class should be deprecated
rightaway.
- change all the framework references now to use
_org.apache.hadoop.mapreduce.util.RunJar_
This avoids the cyclic dependency that you've mentioned. But it definitely
breaks code of those who depend explicitly only on the common jar, but as
discussed on MAPREDUCE-711 and in particular
(https://issues.apache.org/jira/browse/MAPREDUCE-711?focusedCommentId=12729692&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12729692),
project split already broke that kinda dependency.
> 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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