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https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972159#action_12972159
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Mahadev konar commented on MAPREDUCE-1938:
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alejandro, good point. I think the premise here was to provide a simple way
without making too many changes, to allow users to have there libraries in the
classpath. Also, I think the assumption is that the task code doesnt load that
many libraries.I would think its more like a hack than a perfect solution but
I'd be happy to see a solution like the one you proposed. Are you working on
such a soln?
> Ability for having user's classes take precedence over the system classes for
> tasks' classpath
> ----------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1938
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1938
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Components: job submission, task, tasktracker
> Reporter: Devaraj Das
> Assignee: Krishna Ramachandran
> Fix For: 0.22.0
>
> Attachments: mapred-1938-1, mapred-1938-2.patch, mapred-1938-3.patch,
> mr-1938-bp20.1.patch, mr-1938-bp20.patch
>
>
> It would be nice to have the ability in MapReduce to allow users to specify
> for their jobs alternate implementations of classes that are already defined
> in the MapReduce libraries. For example, an alternate implementation for
> CombineFileInputFormat.
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