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https://issues.apache.org/jira/browse/HDFS-870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838608#action_12838608
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dhruba borthakur commented on HDFS-870:
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Hi Koji, we do not use a external script to map Ip address to network topology.
Instead we have java code to map IP address to rack location. Don't you folks
have jave code too?
> Topology is permanently cached
> ------------------------------
>
> Key: HDFS-870
> URL: https://issues.apache.org/jira/browse/HDFS-870
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Allen Wittenauer
>
> Replacing the topology script requires a namenode bounce because the NN
> caches the information permanently. It should really either expire it
> periodically or expire on -refreshNodes.
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