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https://issues.apache.org/jira/browse/HADOOP-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13608393#comment-13608393
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Bikas Saha commented on HADOOP-9422:
------------------------------------
This check was originally added to branch-1-win where a lot of stuff was
getting resolved via HADOOP_HOME.
> HADOOP_HOME should not be required to be set to be able to launch commands
> using hadoop.util.Shell
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9422
> URL: https://issues.apache.org/jira/browse/HADOOP-9422
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.0.3-alpha
> Reporter: Hitesh Shah
>
> Not sure why this is an enforced requirement especially in cases where a
> deployment is done using multiple tar-balls ( one each for
> common/hdfs/mapreduce/yarn ).
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