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https://issues.apache.org/jira/browse/HADOOP-8928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477915#comment-13477915
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Shinichi Yamashita commented on HADOOP-8928:
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The improvement necessary to clear topology cache is as follows.
1. Define method to clear cache in CachedDNSToSwitchMapping
2. Define method to call "1." from NameNode and JobTracker
3. Add a protocol about "2."
4. Add a method about cache clear to DFSAdmin and MRAdmin
5. Add cache clear command to hadoop script
> 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
> Reporter: Shinichi Yamashita
>
> 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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