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https://issues.apache.org/jira/browse/HADOOP-9044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13617805#comment-13617805
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Steve Loughran commented on HADOOP-9044:
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I see. The {{resource}} option just does a {{Classloader.loadResource()}} call
to get a URL, though it would find things like {{/hdfs-site.xml}} and show
where that came from. e.g. show that that resource came from
{{file:///etc/hadoop/conf/hdfs-site.xml}}
# we could add a {{--print}} option to print any found resource to the console,
which could show which log4j and site properties were being loaded.
For real cluster config diagnostics, I'd recommend a separate entry point,
which could do things like
# list all default XML files
# dump the default configuration
# print specific string values
# assert that a configuration parameter equalled a specified string value. That
could be good for some sanity checking post-installation too.
I'd make that a separate JIRA though; this one should be ready to go as is,
with just some documentation
> add FindClass main class to provide classpath checking of installations
> -----------------------------------------------------------------------
>
> Key: HADOOP-9044
> URL: https://issues.apache.org/jira/browse/HADOOP-9044
> Project: Hadoop Common
> Issue Type: New Feature
> Components: util
> Affects Versions: 1.1.0, 2.0.3-alpha
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Attachments: HADOOP-9044.patch, HADOOP-9044.patch
>
>
> It's useful in postflight checking of a hadoop installation to verify that
> classes load, especially codes with external JARs and native codecs.
> An entry point designed to load a named class and create an instance of that
> class can do this -and be invoked from any shell script or tool that does the
> installation.
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