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https://issues.apache.org/jira/browse/HDFS-13478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16443532#comment-16443532
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Íñigo Goiri commented on HDFS-13478:
------------------------------------

Thanks [~linyiqun] for the comments.
After checking, we cannot reuse the membership table as it is updated per 
Router and the way the heartbeat is done would overwrite everything.
For the length, I agree.
We can go with  [^HDFS-13478.001.patch] which just does the basic wiring and 
then we can do the RPC checks in another one.
We can remove the change for MembershipNamenodeResolver from 
[^HDFS-13478.001.patch].

> RBF: Decommission subclusters from the federation
> -------------------------------------------------
>
>                 Key: HDFS-13478
>                 URL: https://issues.apache.org/jira/browse/HDFS-13478
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Major
>         Attachments: HDFS-13478.000.patch, HDFS-13478.001.patch
>
>
> We have a subcluster in our federation that is for testing and is 
> missbehaving. This has a negative impact on the performance with operations 
> that go to every subcluster (e.g., renewLease() or setSafeMode()).



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