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https://issues.apache.org/jira/browse/HADOOP-7189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006635#comment-13006635
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Allen Wittenauer commented on HADOOP-7189:
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I agree. This definitely looks like something that should get reformulated so
that we could set it for debugging without rebuilding and/or (even worse)
restarting the service.
> 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: 0.23.0
> Reporter: Todd Lipcon
> Priority: Minor
> Attachments: 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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