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https://issues.apache.org/jira/browse/HADOOP-8928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575847#comment-15575847
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Steve Loughran commented on HADOOP-8928:
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I've not done anything with topologies for a long time; I had some in patch 
ready status but nobody could be bothered to review them, so I gave up

> Add ability to reset topologies on master nodes
> -----------------------------------------------
>
>                 Key: HADOOP-8928
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8928
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: net
>    Affects Versions: 2.0.2-alpha, 3.0.0-alpha1
>            Reporter: Shinichi Yamashita
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-8928.patch, HADOOP-8928.txt
>
>
> For a topology decision of DataNode and TaskTracker, ScriptBasedMapping 
> (probably TableMapping) confirms HashMap first.
> To decide topology of DataNode and TaskTracker again, it is necessary to 
> restart NameNode and JobTracker.
> Therefore, it is necessary to change (or clear) HashMap function without 
> restarting NameNode and JobTracker.



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