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https://issues.apache.org/jira/browse/HDFS-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440353#comment-16440353
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Yiqun Lin commented on HDFS-13326:
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[~ywskycn], I'm also OK with adding new option of -update. But one thing I'm
concerning that this will be a incompatible change. That is say, some users
used to use -add option for updating mount tables won't make sense. And they
should use -update instead. We would like to add a incompatible tag for this
JIRA and make this change only for branch-2 and trunk. Because there are 2.9.x,
3.0.x and 3.1.x already released, we would better not introduce this
incompatible change in their subsequent minor release versions.
> 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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