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From Jake Mannix <>
Subject Re: [jira] [Commented] (MAHOUT-537) Bring DistributedRowMatrix into compliance with Hadoop 0.20.2
Date Sun, 22 May 2011 20:41:22 GMT
On Sun, May 22, 2011 at 12:35 PM, Sean Owen <> wrote:

> I think you'll have to push that for 1.0 for now then; 0.20.x doesn't
> have map-side joins. Yes that is a blocker for what you're trying to
> do and what Sebastian is trying to do for recommendations. I've
> already reimplemented recommenders separately with these things and it
> simplifies and speeds up the pipeline.

Wait, are you saying that we should force things like matrix multiplication
to become a 3-job process, instead of the current 1-job process?

I thought we've already discussed and decided that moving to 0.20 APIs
where possible should be done, but where it removes functionality and
efficiency, we would allow the old API?


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