Billie Rinaldi created YARN-9613:
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Summary: 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
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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