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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15593) UserGroupInformation TGT renewer throws NPE
Date Mon, 23 Jul 2018 17:27:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553145#comment-16553145
] 

Eric Yang commented on HADOOP-15593:
------------------------------------

Two possible approaches to fix the findbug error:
{code}
            Date endTime = tgt.getEndTime();
            if (tgt != null && endTime != null && !tgt.isDestroyed()) {
              tgtEndTime = endTime.getTime();
            } else {
              tgtEndTime = now;
            }
{code}

or

{code}
          try {
            Date endTime = tgt.getEndTime();
              tgtEndTime = endTime.getTime();
          } catch (NullPointerException npe) {
            LOG.warn("NPE thrown while getting KerberosTicket endTime. The "
                + "endTime will be set to Time.now()");
            tgtEndTime = now;
          }
{code}

Both will work equally well.

> 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
>
>
> 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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