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https://issues.apache.org/jira/browse/HADOOP-12284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652269#comment-14652269
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Aaron Dossett commented on HADOOP-12284:
----------------------------------------
Attached is a real example. This happened when trying to write to Hive from
Storm with the metastore down. See: HADOOP-12284.example
> UserGroupInformation doAs can throw misleading exception
> --------------------------------------------------------
>
> Key: HADOOP-12284
> URL: https://issues.apache.org/jira/browse/HADOOP-12284
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Reporter: Aaron Dossett
> Assignee: Aaron Dossett
> Priority: Trivial
> Attachments: HADOOP-12284.patch
>
>
> If doAs() catches a PrivilegedActionException it extracts the underlying
> cause through getCause and then rethrows an exception based on the class of
> the Cause. If getCause returns null this executes, this is how it rethrown:
> else {
> throw new UndeclaredThrowableException(cause);
> }
> If cause == null that seems misleading. I have seen actual instances where
> cause is null, so this isn't just a theoretical concern.
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