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Date: Fri, 1 Apr 2011 05:46:05 +0000 (UTC)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1690) Name Node should not process format
 command while it is running.
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    [ https://issues.apache.org/jira/browse/HDFS-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014410#comment-13014410 ] 

Konstantin Shvachko commented on HDFS-1690:
-------------------------------------------

Also in_use.lock is deleteOnExit. It would be good if you could investigate why it is not deleted upon exiting.

> 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
>            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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