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https://issues.apache.org/jira/browse/HDFS-5208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13768510#comment-13768510
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Colin Patrick McCabe commented on HDFS-5208:
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It's a little more complicated than just clearing IP address and hostname.
Nodes can be stored by "registration name", <hostname>:<port>, <hostname>, <IP
address>, <IP address>:port.
It would be nice to file a JIRA to get rid of registration name.
> Only clear network location cache on specific nodes if invalid
> NetworkTopology happens
> --------------------------------------------------------------------------------------
>
> Key: HDFS-5208
> URL: https://issues.apache.org/jira/browse/HDFS-5208
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Junping Du
> Assignee: Junping Du
> Attachments: HDFS-5208-v1.patch
>
>
> After HDFS-4521, once a DN is registered with invalid networktopology, all
> cached rack info in DNSToSwitchMapping will be cleared. We should only clear
> cache on specific nodes.
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