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https://issues.apache.org/jira/browse/HDFS-5208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13771504#comment-13771504
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Colin Patrick McCabe commented on HDFS-5208:
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Unfortunately, {{DatanodeID#getHostName}} doesn't actually return the hostname.
It returns {{DatanodeID#hostName}}, which is either the registration name (if
it was specified) or the hostname (if it was not.)
I think this feature is mainly used in unit tests to fake up having different
hostnames-- something we could probably do this in a much simpler way. We've
discussed creating a JIRA to remove it before-- maybe it's time.
> 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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