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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-7326) Some issues in RegistryDNS
Date Thu, 19 Oct 2017 01:21:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-7326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Yang updated YARN-7326:
----------------------------
    Attachment: YARN-7326.yarn-native-services.001.patch

- Added recursion support.
- Configure DNS server to lookup upstream.

> 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
>
>
> [~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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