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https://issues.apache.org/jira/browse/HDFS-13810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590488#comment-16590488
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Íñigo Goiri commented on HDFS-13810:
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If I'm not wrong, this should be similar to adding a mount table entry.
We don't do this for AddMountTableEntryRequest; I think we should keep this 
consistent and do the checks in the same way.

>  RBF: UpdateMountTableEntryRequest isn't validating the record.
> ---------------------------------------------------------------
>
>                 Key: HDFS-13810
>                 URL: https://issues.apache.org/jira/browse/HDFS-13810
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: federation
>    Affects Versions: 3.0.0, 2.9.1
>            Reporter: venkata ram kumar ch
>            Assignee: venkata ram kumar ch
>            Priority: Minor
>         Attachments: HDFS-13810-002.patch, HDFS-13810.patch
>
>
> In RBF when we try to update the existing mount entry by using the add 
> command its creating a mount entry without performing the validation check / 
> on the destination path.
> command : ./hdfs dfsrouteradmin -add /aaa ns1 /tmp (record  added to the 
> mount table)
> Now when we use the below command on the same mount entry. 
> Command : hdfs dfsrouteradmin -add /aaa ns1  -order RANDOM  (its not 
> performing the validation check for the second time).
>  



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