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https://issues.apache.org/jira/browse/HDFS-13861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592177#comment-16592177
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Ayush Saxena commented on HDFS-13861:
-------------------------------------

Thanx [~brahmareddy] for the comment.

i.) It should be backward compatible as the case was only ignored in case of 
checking whether the command has minimum arguments or not.In the execution part 
it is case sensitive only. so it shouldn't be an issue?

ii)Could be done for sure,if you suggest.It was previously like that so was 
thinking to put minimal changes in terms of previous usage.But if you think i 
can do that. 

> RBF: Illegal Router Admin command leads to printing usage for all commands
> --------------------------------------------------------------------------
>
>                 Key: HDFS-13861
>                 URL: https://issues.apache.org/jira/browse/HDFS-13861
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ayush Saxena
>            Assignee: Ayush Saxena
>            Priority: Major
>         Attachments: HDFS-13861-01.patch, HDFS-13861-02.patch
>
>
> When an illegal argument is passed for any router admin command it prints 
> usage for all the admin command it should be specific to the command used and 
> print the usage only for that command.



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