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https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12888436#action_12888436
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Owen O'Malley commented on MAPREDUCE-1938:
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I think that the default for this should be on.
Rather than add HADOOP_CLIENT_CLASSPATH, let's make a new variable
HADOOP_USER_CLASSPATH_LAST. If it is defined, we add HADOOP_CLASSPATH to the
tail like we currently do. Otherwise it is added to the front.
> 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: 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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