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https://issues.apache.org/jira/browse/MAHOUT-1611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14113541#comment-14113541
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Frank Rosner commented on MAHOUT-1611:
--------------------------------------
See [How to
Contribute|https://mahout.apache.org/developers/how-to-contribute.html]/Making
Changes.
Pull requests allow to review your code and to discuss it.
> Preconditions.checkArgument in org.apache.mahout.utils.ConcatenateVectorsJob
> ----------------------------------------------------------------------------
>
> Key: MAHOUT-1611
> URL: https://issues.apache.org/jira/browse/MAHOUT-1611
> Project: Mahout
> Issue Type: Bug
> Components: Integration
> Affects Versions: 0.9
> Reporter: Haishou Ma
> Priority: Minor
>
> In org.apache.mahout.utils.ConcatenateVectorsJob line 111
> Preconditions.checkArgument(paths.length == 0, path.getName() + " is a file,
> should be a directory");
> paths.length == 0 should be paths.length > 0
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