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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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