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https://issues.apache.org/jira/browse/HADOOP-11257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196610#comment-14196610
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Colin Patrick McCabe commented on HADOOP-11257:
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+1 for issuing a warning when "hadoop jar" is used to launch yarn jobs. Or
maybe even failing in 3.0 (but not in 2.x, since we need to stay compatible)
> Deprecate 'hadoop jar'
> ----------------------
>
> Key: HADOOP-11257
> URL: https://issues.apache.org/jira/browse/HADOOP-11257
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Allen Wittenauer
>
> Given that 'hadoop jar' and 'yarn jar' work differently, we should mark
> 'hadoop jar' as deprecated in 2.7 and remove it in trunk.
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