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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1690) Name Node should not process format command while it is running.
Date Thu, 31 Mar 2011 18:26:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014120#comment-13014120
] 

Todd Lipcon commented on HDFS-1690:
-----------------------------------

In that edge condition, I think it's better to make the user manually remove the lock file
before proceeding. Using the web port really seems like a hack, and for rare conditions like
this, it's best to make the user be very sure of what they're doing rather than allow them
to do something stupid inadvertently.

> 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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