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https://issues.apache.org/jira/browse/HDFS-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16441094#comment-16441094
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Íñigo Goiri commented on HDFS-13326:
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In that case, I would prefer for splitting this JIRA in two:
* The part that doesn't break compatibility (adding the update part).
* The part that removes functionality from the add behavior.
In this way, new patches will be easier to maintain and we can keep 2.9 and so
on up to date in code.
> 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
>
>
> 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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