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https://issues.apache.org/jira/browse/HADOOP-9044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497963#comment-13497963
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Steve Loughran commented on HADOOP-9044:
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FindClass class with tests
This is not an extension to the hadoop command, but it is a toolrunner class
that can be invoked by the hadoop + classname method. I don't see any reason
why it could not be added as a new command -I've just initially targeted it at
installation script such as those of Whirr.
usage
{code}
Usage : [load <classname> | create <classname> | resource <resourcename>
org.apache.hadoop.util.TestFindClass
The return codes are:
0 -- The operation was successful
1 -- Something went wrong
2 -- The usage message was printed
3 -- The class or resource was not found
4 -- The class was found but could not be loaded
5 -- The class was loaded, but an instance it could not be created
{code}
> 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
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Attachments: 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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