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https://issues.apache.org/jira/browse/HADOOP-15593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554659#comment-16554659
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Eric Yang commented on HADOOP-15593:
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[~xiaochen] Renewal thread supposed to run until max_renewable_life has been
reached. If ticket end time is expired or unknown, but max_renewable_life is
not expired, we would want the renewal loop to run. Maybe there is KDC outages
to cause endTime = null, but retry should be attempted. Hadoop doesn't seem to
have logic to check max_renewable_life, therefore, it may keep trying to
prevent service outage for now. We probably want to open another ticket for
enhancement to respect max_renewable_life. It is safer to retry than having
cluster goes down because Kerberos tickets can not be renewed.
> UserGroupInformation TGT renewer throws NPE
> -------------------------------------------
>
> Key: HADOOP-15593
> URL: https://issues.apache.org/jira/browse/HADOOP-15593
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 3.0.0
> Reporter: Wei-Chiu Chuang
> Assignee: Gabor Bota
> Priority: Blocker
> Attachments: HADOOP-15593.001.patch, HADOOP-15593.002.patch,
> HADOOP-15593.003.patch, HADOOP-15593.004.patch
>
>
> Found the following NPE thrown in UGI tgt renewer. The NPE was thrown within
> an exception handler so the original exception was hidden, though it's likely
> caused by expired tgt.
> {noformat}
> 18/07/02 10:30:57 ERROR util.SparkUncaughtExceptionHandler: Uncaught
> exception in thread Thread[TGT Renewer for [email protected],5,main]
> 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:748){noformat}
> Suspect it's related to [https://bugs.openjdk.java.net/browse/JDK-8154889].
> The relevant code was added in HADOOP-13590. File this jira to handle the
> exception better.
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