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https://issues.apache.org/jira/browse/MAPREDUCE-1478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832254#action_12832254
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Arun C Murthy commented on MAPREDUCE-1478:
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We also need to load the mapreduce.lib jar after loading the user-jars. 
Currently we load the system jars and then user jars, so the new order would be:

system-jars, user.libs, mapreduce.lib.

> 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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