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https://issues.apache.org/jira/browse/MAPREDUCE-4659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456301#comment-13456301
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Harsh J commented on MAPREDUCE-4659:
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Good idea, I've seen this bite a few users before. Note though, that on 2.x and
current 1.x, the HADOOP_HOME was deprecated for HADOOP_PREFIX and per-component
homes. So maybe we could also look at HADOOP_COMMON_HOME, which is the lib set
that has the VersionInfo?
> Confusing output when running "hadoop version" from one hadoop installation
> when HADOOP_HOME points to another
> --------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4659
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4659
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client
> Affects Versions: 0.20.2
> Reporter: Sandy Ryza
>
> Hadoop version X is downloaded to ~/hadoop-x, and Hadoop version Y is
> downloaded to ~/hadoop-y. HADOOP_HOME is set to hadoop-x. A user running
> hadoop-y/bin/hadoop might expect to be running the hadoop-y jars, but,
> because of HADOOP_HOME, will actually be running hadoop-x jars.
> "hadoop version" could help clear this up a little by reporting the current
> HADOOP_HOME.
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