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https://issues.apache.org/jira/browse/HADOOP-8938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477778#comment-13477778
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Steve Loughran commented on HADOOP-8938:
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Things that are often useful to know
* Java home: value and what is at the far end
* Hadoop conf directory picked up (symlink games can cause confusion)
* which *-site.xml files are being picked up (full path)
* full path to commands
* native lib directory and contents
This isn't stuff that needs to be printed every run, so it should be something
that could be turned on if needed.
> add option to do better diags of startup configuration
> ------------------------------------------------------
>
> Key: HADOOP-8938
> URL: https://issues.apache.org/jira/browse/HADOOP-8938
> Project: Hadoop Common
> Issue Type: New Feature
> Components: bin
> Affects Versions: 1.1.0, 2.0.2-alpha
> Reporter: Steve Loughran
> Priority: Minor
>
> HADOOP-8931 shows a symptom of a larger problem: we need better diagnostics
> of what all the environment variables and settings going through the hadoop
> scripts to find out why something isn't working.
> Ideally some command line parameter to the scripts (or even: a new
> environment variable) could trigger more display of critical parameters.
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