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From "Owen O'Malley" <owen.omal...@gmail.com>
Subject Re: Combiner phase question
Date Fri, 04 Dec 2009 21:42:48 GMT
On Fri, Dec 4, 2009 at 12:32 PM, Raymond Jennings III <raymondjiii@yahoo.com
> wrote:

> Does the combiner run once per data node or one per map task?  (That it can
> run multiple times on the same data node after each map task.)  Thanks.
>

The combiner can run 0, 1, or many times on each data value. It can run in
both the map task and reduce task.

-- Owen

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