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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12420) Disable Namenode format when data already exists
Date Wed, 13 Sep 2017 18:19:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16165068#comment-16165068
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Vinayakumar B commented on HDFS-12420:
--------------------------------------

bq. 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.
Yes I agree, admin can make mistakes. In real cluster 'format' command (especially with -force)
should be used with at-most attention(same as 'rm -r' in linux).
bq.  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.

Still if you insist to disallow format in 'production' clusters, this option looks good, provided
default value set to 'dev' mode to keep current 'prompt' behavior as is.

> 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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