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https://issues.apache.org/jira/browse/MAPREDUCE-1478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832249#action_12832249
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Arun C Murthy commented on MAPREDUCE-1478:
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Yes, we would need to use the installed ones by default - however, it gives the
users an option to use a newer version of mapreduce.libraries etc.
> Separate the mapred.lib and mapreduce.lib classes to a different jar and
> include the user jar ahead of the lib jar.
> -------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1478
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1478
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task
> Reporter: Owen O'Malley
>
> Currently the user can't include updated library jars as part of their job.
> By pulling out the lib classes we can include the classes (eg.
> TextInputFormat) in the user's jar and get their version and not the system
> installed one.
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