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https://issues.apache.org/jira/browse/HADOOP-12649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059982#comment-15059982
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Allen Wittenauer commented on HADOOP-12649:
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There is nothing better than waking up to find some magic, undocumented env var
like HADOOP_JAAS_DEBUG.
> Improve UGI diagnostics and failure handling
> --------------------------------------------
>
> Key: HADOOP-12649
> URL: https://issues.apache.org/jira/browse/HADOOP-12649
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Affects Versions: 2.7.1
> Environment: Kerberos
> Reporter: Steve Loughran
>
> Sometimes —apparently— some people cannot get kerberos to work.
> The ability to diagnose problems here is hampered by some aspects of UGI
> # the only way to turn on JAAS debug information is through an env var, not
> within the JVM
> # failures are potentially underlogged
> # exceptions raised are generic IOEs, so can't be trapped and filtered
> # failure handling on the TGT renewer thread is nonexistent
> # the code is barely-readable, underdocumented mess.
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