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https://issues.apache.org/jira/browse/HADOOP-7189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032144#comment-13032144
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Todd Lipcon commented on HADOOP-7189:
-------------------------------------
+1 for Ted's patch. Unfortunately I wasn't able to use the test that Andrew
contributed, since this feature happens in a static initialization block and
depends on an env var. I manually tested by running the UGI class from the
command line with and without the env var set to "true".
> Add ability to enable 'debug' property in JAAS configuration
> ------------------------------------------------------------
>
> Key: HADOOP-7189
> URL: https://issues.apache.org/jira/browse/HADOOP-7189
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Ted Yu
> Priority: Minor
> Labels: newbie
> Attachments: HADOOP-7189.patch, HADOOP-7189.txt,
> enable-UGI-debug-example.txt
>
>
> Occasionally users have run into weird "Unable to login" messages.
> Unfortunately, JAAS obscures the underlying exception message in many cases
> because it thinks leaking the exception might be insecure in itself. Enabling
> the "debug" option in the JAAS configuration gets it to dump the underlying
> issue and makes troubleshooting this kind of issue easier.
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