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https://issues.apache.org/jira/browse/YARN-7326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16212950#comment-16212950
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Jian He commented on YARN-7326:
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[~eyang],
I'm not familiar with the JAVA DNS libs, could you add some comments in the
code to explain what the new method is doing ?, like the updateDNSServer
method. It'll be useful for people who aren't familiar with these libs to
understand.
And how can I test this this change ?
> Some issues in RegistryDNS
> --------------------------
>
> Key: YARN-7326
> URL: https://issues.apache.org/jira/browse/YARN-7326
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Jian He
> Assignee: Eric Yang
> Attachments: YARN-7326.yarn-native-services.001.patch,
> YARN-7326.yarn-native-services.002.patch
>
>
> [~aw] helped to identify these issues:
> Now some general bad news, not related to this patch:
> Ran a few queries, but this one is a bit concerning:
> {code}
> root@ubuntu:/hadoop/logs# dig @localhost -p 54 .
> ;; Warning: query response not set
> ; <<>> DiG 9.10.3-P4-Ubuntu <<>> @localhost -p 54 .
> ; (2 servers found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOTAUTH, id: 47794
> ;; flags: rd ad; QUERY: 0, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
> ;; WARNING: recursion requested but not available
> ;; Query time: 0 msec
> ;; SERVER: 127.0.0.1#54(127.0.0.1)
> ;; WHEN: Thu Oct 12 16:04:54 PDT 2017
> ;; MSG SIZE rcvd: 12
> root@ubuntu:/hadoop/logs# dig @localhost -p 54 axfr .
> ;; Connection to ::1#54(::1) for . failed: connection refused.
> ;; communications error to 127.0.0.1#54: end of file
> root@ubuntu:/hadoop/logs#
> {code}
> It looks like it effectively fails when asked about a root zone, which is bad.
> It's also kind of interesting in what it does and doesn't log. Probably
> should be configured to rotate logs based on size not date.
> The real showstopper though: RegistryDNS basically eats a core. It is running
> with 100% cpu utilization with and without jsvc. On my laptop, this is
> triggering my fan.
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