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https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12900792#action_12900792
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Luke Lu commented on MAPREDUCE-1938:
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Nits in the test code aside, +1

> 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
>             Fix For: 0.22.0
>
>         Attachments: mapred-1938-1, mapred-1938-2.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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