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From Drew Farris <>
Subject Re: Writables and Inheritance
Date Tue, 05 Jan 2010 18:27:35 GMT
On Tue, Jan 5, 2010 at 1:08 PM, Jake Mannix <> wrote:

> How would you specify which Writable implementation at runtime?  You
> have Mapper and Reducers which are keyed on Writable types... you need
> to pick which one to use.

I assumed it could be done it similarly to the way in which it is
currently done for Vector implementations, but I'm surprised this even
works in light of Hadoop's exact class matching. I'll have to crack
open the Mahout code later to take a closer look.


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