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https://issues.apache.org/jira/browse/MAPREDUCE-4521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13474495#comment-13474495
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Ravi Prakash commented on MAPREDUCE-4521:
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I tested that MRApps now picks up the deprecated config too, and treats it same
as the new one
> mapreduce.user.classpath.first incompatibility with 0.20/1.x
> ------------------------------------------------------------
>
> Key: MAPREDUCE-4521
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4521
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.1, 2.0.0-alpha
> Reporter: Jason Lowe
> Assignee: Ravi Prakash
> Attachments: MAPREDUCE-4521.patch
>
>
> In Hadoop 0.20 or 1.x, jobs can specify the user's classpath should appear
> first by setting the property mapreduce.user.classpath.first to true in the
> job configuration. However in Hadoop 0.23 or 2.x, this has no effect, as the
> corresponding property there is mapreduce.job.user.classpath.first.
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