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https://issues.apache.org/jira/browse/HDFS-1958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036353#comment-13036353
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Todd Lipcon commented on HDFS-1958:
-----------------------------------

btw, for those who might be concerned about accidentally formatting the NN 
(perhaps your cat likes to jump on the 'y' key and then the enter key), you can 
also enable HDFS-718 to completely disallow it.

> Format confirmation prompt should be more lenient of its input
> --------------------------------------------------------------
>
>                 Key: HDFS-1958
>                 URL: https://issues.apache.org/jira/browse/HDFS-1958
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>
>         Attachments: hdfs-1958.txt
>
>
> As reported on the mailing list, the namenode format prompt only accepts 'Y'. 
> We should also accept 'y' and 'yes' (non-case-sensitive).

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