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https://issues.apache.org/jira/browse/HDFS-12420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16165043#comment-16165043
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Jitendra Nath Pandey commented on HDFS-12420:
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In spite of the -force option or the prompt for Y/N, admins do make mistakes
and end up loosing data. In a real production cluster with real data, why would
someone want to do a format? In dev/qa clusters, I can see the need for format.
Another option is to configure the cluster as "production" mode, where format
will not be allowed. Dev/test clusters can be configured with 'dev' mode, where
format is allowed.
> Disable Namenode format when data already exists
> ------------------------------------------------
>
> Key: HDFS-12420
> URL: https://issues.apache.org/jira/browse/HDFS-12420
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ajay Kumar
> Assignee: Ajay Kumar
> Attachments: HDFS-12420.01.patch, HDFS-12420.02.patch
>
>
> Disable NameNode format to avoid accidental formatting of Namenode in
> production cluster. If someone really wants to delete the complete fsImage,
> they can first delete the metadata dir and then run {code} hdfs namenode
> -format{code} manually.
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