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From Sean Owen <>
Subject Re: [jira] [Commented] (MAHOUT-537) Bring DistributedRowMatrix into compliance with Hadoop 0.20.2
Date Sun, 22 May 2011 20:49:14 GMT
Ah righty -- this exists in the old API doesn't it... even in 0.20.x
But it's deprecated. But it's not deprecated in 0.21+.

Yes I think there's a strong argument to make use of that even if it
is deprecated.

I had in mind the unnecessary use of old .mapred. APIs for simple
Mappers and Reducers.

On Sun, May 22, 2011 at 9:41 PM, Jake Mannix <> wrote:
> 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?
>  -jake

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