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https://issues.apache.org/jira/browse/HADOOP-12650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060168#comment-15060168
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Allen Wittenauer commented on HADOOP-12650:
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Luckily, KRB5_CCNAME is actually in the Kerberos man pages. :)
> Document all of the secret env vars
> -----------------------------------
>
> Key: HADOOP-12650
> URL: https://issues.apache.org/jira/browse/HADOOP-12650
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Affects Versions: 3.0.0
> Reporter: Allen Wittenauer
> Priority: Blocker
>
> Over the years, developers have added all kinds of magical environment
> variables in the Java code without any concern or thought about either a)
> documenting them or b) whether they are already used by something else. We
> need to update at least hadoop-env.sh to contain a list of these env vars so
> that end users know that they are either private/unsafe and/or how they can
> be used.
> Just one of many examples: HADOOP_JAAS_DEBUG.
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