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https://issues.apache.org/jira/browse/YARN-9613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16862481#comment-16862481
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Billie Rinaldi commented on YARN-9613:
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Thanks for the comment, [~eyang]. That sounds reasonable.
> Avoid remote lookups for RegistryDNS domain
> -------------------------------------------
>
> Key: YARN-9613
> URL: https://issues.apache.org/jira/browse/YARN-9613
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 3.1.2
> Reporter: Billie Rinaldi
> Priority: Major
>
> A typical setup for RegistryDNS is for an upstream DNS server to forward DNS
> queries matching the hadoop.registry.dns.domain-name to RegistryDNS. If the
> RegistryDNS lookup gets a non-zero DNS RCODE, RegistryDNS performs a remote
> lookup in upstream DNS servers. For bad queries, this can result in a loop
> when the upstream DNS server forwards the query back to RegistryDNS.
> To solve this problem, we should avoid performing remote lookups for queries
> within hadoop.registry.dns.domain-name, which are expected to be handled by
> RegistryDNS. We may also want to evaluate whether we should add a
> configuration property that allows the user to disable remote lookups
> entirely for RegistryDNS, for installations where RegistryDNS is set up as
> the last DNS server in a chain of DNS servers.
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