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https://issues.apache.org/jira/browse/HADOOP-6606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839961#action_12839961
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Allen Wittenauer commented on HADOOP-6606:
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> There is too high a likelihood that pid files could be altered or deleted.
If this was wikipedia, I'd add a "citation needed" flag.
> A more reasonable default is $HADOOP_HOME/pids.
Same thing.
Why not use the logs dir rather than introduce another dir? What happens when
the mapred framework and the hdfs framework are run as different users? Does
LinuxTaskController being on have any impact? What happens if hadoop-env.sh
sets the pid dir, do we honor that? Are we building a "software fix" to work
around what is ultimately an installation issue?
> 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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