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https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159936#comment-13159936
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Lars Francke commented on MAPREDUCE-1938:
-----------------------------------------
Is this documented somewhere? How would I find out about this possibility
without having to use a search engine and stumbling across this and then having
to read a patch or release notes?
Honest question. I never know where, how and if things are being documented in
Hadoop.
> 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: 0.20.204.0, 0.23.0
>
> 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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