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https://issues.apache.org/jira/browse/HDFS-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198596#comment-13198596
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Uma Maheswara Rao G commented on HDFS-1690:
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Thanks Todd. I have seen it.
> Name Node should not process format command while it is running.
> ----------------------------------------------------------------
>
> Key: HDFS-1690
> URL: https://issues.apache.org/jira/browse/HDFS-1690
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20.1, 0.20.2, 0.21.0, 0.23.0
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
> Attachments: HDFS-1690.patch
>
>
> Currently NameNode allows format command while it running. In this case the
> command is executed partially (Lock file is deleted) and an exception thrown.
> Because of this Name Node should be formatted after restart. This sort of
> cases can happen accidentally. To prevent such cases Name Node should not
> execute the format command partially while it is running. It can stright away
> throw exception/log saying, Name Node is running.
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