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https://issues.apache.org/jira/browse/HADOOP-15597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Yang resolved HADOOP-15597.
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Resolution: Duplicate
> UserGroupInformation class throws NPE when Kerberos TGT expired
> ---------------------------------------------------------------
>
> Key: HADOOP-15597
> URL: https://issues.apache.org/jira/browse/HADOOP-15597
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 2.9.0, 3.0.0, 3.1.0, 2.9.1, 3.0.1, 3.0.2, 2.9.2
> Reporter: Eric Yang
> Priority: Critical
>
> UserGroupInformation class throws NPE RuntimeException when tgt renewer can
> not determine expiration time:
> {code}
> Thread Thread[TGT Renewer for rm/host1.example....@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}
> The error occurs when Hadoop daemon processes uses UGI class to do service
> tgt renewal. The code is written that reattachMetrics() must be called by
> the main program to initialize UGI metrics. Metrics initialization is only
> called by resource manager. Other Hadoop processes do not call
> reattachMetrics(). The runtime exception could cause interruption to Hadoop
> services as observed in YARN RegistryDNS (YARN-8514). It would be nice if
> metrics initialization happens in UGI class without reliance on Hadoop
> program to make UGI metrics initialization.
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