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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12650) Document all of the secret env vars
Date Thu, 28 Jan 2016 14:43:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15121604#comment-15121604

Steve Loughran commented on HADOOP-12650:

HADOOP-12426 patch 009 documents {{HADOOP_JAAS_DEBUG}} and adds a mention of it to `hadoop-env.sh`,
that being the place to add it to diagnose server-side problems

> 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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