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https://issues.apache.org/jira/browse/HADOOP-11393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14268170#comment-14268170
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Allen Wittenauer commented on HADOOP-11393:
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It should be noted that Windows still uses HADOOP_HOME, which leads to
interesting contortions when trying to use cygwin. See HADOOP-11464 .
> Revert HADOOP_PREFIX, go back to HADOOP_HOME
> --------------------------------------------
>
> Key: HADOOP-11393
> URL: https://issues.apache.org/jira/browse/HADOOP-11393
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Allen Wittenauer
> Attachments: HADOOP-11393-00.patch
>
>
> Today, Windows and parts of the Hadoop source code still use HADOOP_HOME.
> The switch to HADOOP_PREFIX back in 0.21 or so didn't really accomplish what
> it was intended to do and only helped confuse the situation.
> _HOME is a much more standard suffix and is, in fact, used for everything in
> Hadoop except for the top level project home. I think it would be beneficial
> to use HADOOP_HOME in the shell code as the Official(tm) variable, still
> honoring HADOOP_PREFIX if it is set.
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