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From Paul Mahon <>
Subject Re: The perennial "Error: java.lang.ClassNotFoundException: org.apache.mahout.math.Vector" problem
Date Mon, 09 May 2011 17:37:58 GMT
I use the one big jar technique for regular hadoop and mahout jobs 
because of these kinds of problems. I use the jarjar task with ant, I 
expect Maven has something similar. I haven't had any of the class not 
found problems since I started doing it.

On 05/09/2011 10:32 AM, Benson Margulies wrote:
>> So that explains how some user rebundlings don't work with us, sometimes.
>> What it doesn't explain is why running the regular, not-rebundled
>> "mahout-examples-0.5-SNAPSHOT-job.jar" via the bin/mahout shell
>> script is throwing this ClassNotFoundException for me (and it's happened
>> to Sean, and according to the list archives, others as well) in a production
>> cluster.
> I agree that it doesn't explain. However, the code in hadoop that
> implements this mechanism, well, if you ask me ... it STINKS. It
> wouldn't surprise me if it fails in some case we haven't
> characterized. This would argue for Sean's 'one big jar' approach.

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