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https://issues.apache.org/jira/browse/HADOOP-6606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840246#action_12840246
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Allen Wittenauer commented on HADOOP-6606:
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BTW, it is worth pointing out that all of these options are *already* in
hadoop-env.sh. This change and the others in the set just basically override
the defaults in case they are not set.
> Change the default HADOOP_PID_DIR to $HADOOP_HOME/pids
> ------------------------------------------------------
>
> Key: HADOOP-6606
> URL: https://issues.apache.org/jira/browse/HADOOP-6606
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 0.20.2
> Reporter: Chad Metcalf
> Assignee: Chad Metcalf
> Attachments: HADOOP-6606.patch
>
>
> /tmp should not be used as a pid directory. There is too high a likelihood
> that pid files could be altered or deleted. A more reasonable default is
> $HADOOP_HOME/pids.
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