He's talking about simple kmeans which is a mapper only job. Sean's already 
addressed his question

Sent from my iPhone

> On Mar 4, 2014, at 5:49 AM, Sebastian Schelter <[email protected]> wrote:
> 
> We have several implementations of k-Means, which one do you refer to?
> 
> --sebastian
> 
>> On 03/04/2014 11:43 AM, Gmail wrote:
>> Hello,
>> I was studying Mahout libraries and I found something of strange in your
>> kMeans implementation.
>> 
>> I was looking inside it and I have noticed that kMeans only uses map
>> functions, omitting the reducers. Why have you done this choice?
>> It is not using MapReduce programming model even if it is declared that
>> the Mahout's core is Hadoop.
>> Is this choice driven by performance issue?
>> 
>> Best regards
>> Manuel Sequino
> 

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