DTW distance measure and K-medioids, Hierarchical clustering

[Marko Dinic]

Hello everyone.

I have a couple of questions.
1) Is there an implementation of DTW (Dynamic Time Warping) in Mahout 
that could be used as a distance measure for clustering?

2) Why isn't there an implementation of K-mediods in Mahout? I'm 
guessing that it could not be implemented efficiently on Hadoop, but I 
wanted to check if something like that is possible.

3) Same question, just considering Agglomerative Hierarchical clustering.

Thanks