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https://issues.apache.org/jira/browse/MAHOUT-1291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-1291.
-------------------------------
Resolution: Fixed
Assignee: Sean Owen
> MahoutDriver yields cosmetically suboptimal exception when bin/mahout runs
> without args, on some Hadoop versions
> ----------------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1291
> URL: https://issues.apache.org/jira/browse/MAHOUT-1291
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.8
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Trivial
> Fix For: 0.9
>
> Attachments: MAHOUT-1291.patch
>
>
> If you run bin/mahout without arguments, an error is correctly displayed
> about lack of an argument. The part that displays the error is actually
> within Hadoop code. In some versions of Hadoop, in the error case, it will
> quit the JVM with System.exit(). In others, it does not.
> In the calling code in MahoutDriver, in this error case, the main() method
> does not actually return. So, for versions where Hadoop code doesn't
> immediately exit the JVM, execution continues. This yields another exception.
> It's pretty harmless but ugly.
> Attached is a one-line fix, to return from main() in the error case, which is
> more correct to begin with.
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