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https://issues.apache.org/jira/browse/HADOOP-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13609762#comment-13609762
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Harsh J commented on HADOOP-9422:
---------------------------------
It was deprecated when folks added packaging support to Apache Hadoop itself
(no longer used, but these changes have stuck since then and even Apache Bigtop
uses the new env-vars today): HADOOP-6255. The new env-var is HADOOP_PREFIX for
the base, and HADOOP_*_HOME for each component (COMMON, MAPRED, YARN and
HDFS)'s library directories.
> 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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