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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7198) Add jsvc support for RegistryDNS
Date Thu, 12 Oct 2017 22:31:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16202732#comment-16202732
] 

Allen Wittenauer commented on YARN-7198:
----------------------------------------

I'm still playing with the last patch, but I'm very perplexed.

If I set

{code}
export YARN_REGISTRYDNS_SECURE_USER=yarn
{code}

in hadoop-env.sh/yarn-env.sh and then run:

{code}
yarn --daemon start registrydns
{code}

 the process breaks with 

{code}
java.lang.ClassNotFoundException: org.apache.hadoop.registry.server.dns.PrivilegedRegistryDNSStarter
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.commons.daemon.support.DaemonLoader.load(DaemonLoader.java:151)
Cannot load daemon
Service exit with a return value of 3
{code}

That's indicative of either the classname being wrong or the jar files being or the class
not being in the jar files or whatever.  A quick pass through the jars I'm using show it isn't
in there.  I'll double check my build to make sure it's the correct one.  It's likely a local
build problem, so whatever.

But if I don't set that (and therefore, don't get the jsvc behavior)

It comes up as yarn on port 54... which shouldn't work since 54 is a reserved port and the
yarn user shouldn't have access to that port.  Very very curious.

> 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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