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https://issues.apache.org/jira/browse/YARN-8600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16565277#comment-16565277
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Shane Kumpf commented on YARN-8600:
-----------------------------------
Thanks for the patch, [~eyang]. I had some trouble finding an example lookup to
test, but I was able to find a repro. I can confirm this resolves the issue.
Two minor nits:
* The timeout on the test should be increased as the thread may not have timed
out by the timeout trigger, causing the test to fail.
* When the timeout exception occurs, I would like to see the query type in the
exception message to help aid in figuring out the exact query that hung.
I'm +1 on this patch with those changes. I can make these minor changes at
commit time if you'd like [~eyang]. I'll commit this with those changes later
today unless there are other concerns.
> RegistryDNS hang when remote lookup does not reply
> --------------------------------------------------
>
> Key: YARN-8600
> URL: https://issues.apache.org/jira/browse/YARN-8600
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Affects Versions: 3.1.0
> Reporter: Eric Yang
> Assignee: Eric Yang
> Priority: Critical
> Attachments: YARN-8600.001.patch, YARN-8600.002.patch
>
>
> If lookup type mismatch with the record to query, remote DNS server might not
> reply. For example looking up a CNAME record with a PTR address:
> 1.76.27.172.in-addr.arpa. This can hang registryDNS.
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