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https://issues.apache.org/jira/browse/HADOOP-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13636275#comment-13636275
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Steve Loughran commented on HADOOP-9422:
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also, because it is at error, the only way to stop it appearing in the logs is
to add a line to the log to suppress all error level events
{code}
log4j.logger.org.apache.hadoop.util.Shell=FATAL
{code}
This can actually hide warning messages that are in fact significant, namely
the failure of things to exec properly
> 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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