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https://issues.apache.org/jira/browse/YARN-7731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322900#comment-16322900
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Billie Rinaldi commented on YARN-7731:
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Thanks for the patch, [~eyang]! I tried patch 002 and this fixes the issue I
was seeing with CNAME records. One question, do we need to guard against an
infinite loop in the case where a lookup for the CNAME alias returns another
CNAME record, and the aliases form a loop?
> RegistryDNS should handle upstream DNS returning CNAME
> ------------------------------------------------------
>
> Key: YARN-7731
> URL: https://issues.apache.org/jira/browse/YARN-7731
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Billie Rinaldi
> Assignee: Eric Yang
> Attachments: YARN-7731.001.patch, YARN-7731.002.patch
>
>
> When RegistryDNS performs a lookup in an upstream DNS server and a CNAME
> record is retrieved, it returns a response with only the CNAME record (there
> is no A record, meaning no IP address is resolved). RegistryDNS should
> perform a lookup on the new name from the CNAME record in an attempt to find
> an A record, which would provide an IP address.
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