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https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972575#action_12972575
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Mahadev konar commented on MAPREDUCE-1938:
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alejandro, I think your claim might be a little broken in seeing this as a big
overhaul of the class loading. Users I have mostly interacted with usually dont
do so. Other users (advanced) usually want this to try things out or in case of
urgent fixes (not already installed) want to override that with a new jar ( the
new jar has all the dependencies it needs). I have usually seens users wanting
to override one of the jars in the classpath. If you think otherwise, please do
make changes as you see fit.
> 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
> Priority: Blocker
> 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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