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https://issues.apache.org/jira/browse/HDFS-5208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13769013#comment-13769013
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Junping Du commented on HDFS-5208:
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Thanks for comments, Colin! I checked again on all callers of
DNSToSwitchMapping.resolve() but didn't find anywhere to resolve a registration
name (the only way to fill the cache). Also, DN registration will call
resolveNetworkLocation() in DatanodeManager which only resolve IpAddr or
Hostname, Am I missing something here?
> 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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