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https://issues.apache.org/jira/browse/YARN-7198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16202787#comment-16202787
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Allen Wittenauer commented on YARN-7198:
----------------------------------------

Anyway, rebuilt and it started up. Also it didn't switch to yarn this time 
without the env var set, so I'm not sure what was going on there.

In any case, I'm +1 on this particular patch. 

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.

> Add jsvc support for RegistryDNS
> --------------------------------
>
>                 Key: YARN-7198
>                 URL: https://issues.apache.org/jira/browse/YARN-7198
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn-native-services
>            Reporter: Billie Rinaldi
>            Assignee: Billie Rinaldi
>            Priority: Critical
>         Attachments: YARN-7198-yarn-native-services.01.patch, 
> YARN-7198-yarn-native-services.02.patch, 
> YARN-7198-yarn-native-services.03.patch, 
> YARN-7198-yarn-native-services.04.patch, 
> YARN-7198-yarn-native-services.05.patch, 
> YARN-7198-yarn-native-services.06.patch
>
>
> RegistryDNS should have jsvc support and be managed through the shell 
> scripts, rather than being started manually. See original comments on 
> YARN-7191.



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