Does Mahout provide a way to evaluate a distributed Recommender running on Hadoop?

[WangRamon]

Hi Guys
 
We're going to evaluate how good a distributed (on Hadoop) recommender is, i 
found Mahout provides some stand alone implementation to evaluate a 
recommender, so is there a distributed implementation we can use in a Hadoop 
environment, thanks a lot.
 
BTW, if there is not such an implementation, do we have any solution/idea on 
how to implement one?
 
Cheers
Ramon