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https://issues.apache.org/jira/browse/HDFS-12420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179073#comment-16179073
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Daryn Sharp commented on HDFS-12420:
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bq. NameNode format aborted as reform is disabled for this cluster.
# "reform" should be "reformat"
# The conf key description makes reference to "prod". As Kihwal points out it
isn't a universal term so it should be removed.
+1 after addressing those issues.
> Add an option to disallow 'namenode format -force'
> --------------------------------------------------
>
> 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,
> HDFS-12420.03.patch, HDFS-12420.04.patch, HDFS-12420.05.patch,
> HDFS-12420.06.patch, HDFS-12420.07.patch, HDFS-12420.08.patch,
> HDFS-12420.09.patch
>
>
> Support for disabling 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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