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https://issues.apache.org/jira/browse/HDFS-14593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16870729#comment-16870729
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Takanobu Asanuma commented on HDFS-14593:
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Thanks for your comment, [~crh].

IIUC, currently users can't remove old routers, which are replaced or whose 
hostnames are changed, from RouterState(Router Information page). I propose 
that RouterAdmin can remove a router from RouterState when its status is 
EXPIRED.

> RBF: RouterAdmin should be able to remove expired routers from Routers 
> Information
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-14593
>                 URL: https://issues.apache.org/jira/browse/HDFS-14593
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: rbf
>            Reporter: Takanobu Asanuma
>            Assignee: Takanobu Asanuma
>            Priority: Major
>
> Currently, any router seems to exist in the Router Information eternally.



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