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https://issues.apache.org/jira/browse/HDFS-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16448740#comment-16448740
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Gang Li commented on HDFS-13326:
--------------------------------

Hi, guys,  i just uploaded two patches.  [^HDFS-13326.002.patch] does not break 
the compatibility. [^HDFS-13326.003.patch] removed the update functionality 
from the add cmd. 

> RBF: Improve the interfaces to modify and view mount tables
> -----------------------------------------------------------
>
>                 Key: HDFS-13326
>                 URL: https://issues.apache.org/jira/browse/HDFS-13326
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Wei Yan
>            Assignee: Gang Li
>            Priority: Minor
>         Attachments: HDFS-13326.000.patch, HDFS-13326.001.patch, 
> HDFS-13326.002.patch, HDFS-13326.003.patch
>
>
> From DFSRouterAdmin cmd, currently the update logic is implemented inside add 
> operation, where it has some limitation (e.g. cannot update "readonly" or 
> removing a destination).  Given the RPC alreadys separate add and update 
> operations, it would be better to do the same in cmd level.



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