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https://issues.apache.org/jira/browse/HADOOP-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13608423#comment-13608423
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Chris Nauroth commented on HADOOP-9422:
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I think we can safely relax the logic in {{Shell}} so that it's only a hard
dependency when running on Windows, where we need to find winutils.exe. This
can be satisfied from either the hadoop.home.dir system property or the
HADOOP_HOME environment variable, without necessarily requiring both to be set.
> 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: 3.0.0
> 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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