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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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