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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8514) YARN RegistryDNS throws NPE when Kerberos tgt expires
Date Tue, 10 Jul 2018 19:49:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16539164#comment-16539164
] 

Eric Yang commented on YARN-8514:
---------------------------------

This NPE is introduced by YARN-4983.  UgiMetrics will not be initialized in UGI class, unless
there is external code that calls:
{code:java}
UserGroupInformation.reattachMetrics();{code}
There is a possibility that other new process encounter the same NPE in Kerberos enabled environment. 
It would be great if the reattachMetrics call can be initialized by itself without external
invocation.

> YARN RegistryDNS throws NPE when Kerberos tgt expires
> -----------------------------------------------------
>
>                 Key: YARN-8514
>                 URL: https://issues.apache.org/jira/browse/YARN-8514
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Eric Yang
>            Priority: Critical
>
> After Kerberos ticket expires, RegistryDNS throws NPE error:
> {code:java}
> 2018-07-06 01:26:25,025 ERROR yarn.YarnUncaughtExceptionHandler (YarnUncaughtExceptionHandler.java:uncaughtException(68))
- Thread Thread[TGT Renewer for rm/host1.example.com@EXAMPLE.COM,5,main] threw an Exception.
> java.lang.NullPointerException
>         at javax.security.auth.kerberos.KerberosTicket.getEndTime(KerberosTicket.java:482)
>         at org.apache.hadoop.security.UserGroupInformation$1.run(UserGroupInformation.java:894)
>         at java.lang.Thread.run(Thread.java:745){code}



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