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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15593) UserGroupInformation TGT renewer throws NPE
Date Wed, 25 Jul 2018 04:19:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16555116#comment-16555116
] 

Xiao Chen commented on HADOOP-15593:
------------------------------------

If we did what's proposed in [my previous comment|https://issues.apache.org/jira/browse/HADOOP-15593?focusedCommentId=16554585&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16554585],
the case when tgt is destroyed will be handled by the {{return}} statement.

In the rare race that the tgt gets destroyed after the code has gone after those lines, the
rest of the logic including the nextRefresh part you pointed out does not depend on tgt anymore
(it only depends on the local var {{tgtEndTime}}). We should be fine just it retry one more
time and return on the tgt null check next time it enters the while loop.

So we don't need to change {{now > nextRefresh}} part of code. Did I miss anything?

> 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 foo@EXAMPLE.COM,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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