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+2  Q: 

Availiable reducers in Elastic MapReduce

I hope I'm asking this in the right way. I'm learning my way around Elastic MapReduce and I've seen numerous references to the "Aggregate" reducer that can be used with "Streaming" job flows.

In Amazon's "Introduction to Amazon Elastic MapReduce" PDF it states "Amazon Elastic MapReduce has a default reducer called aggregrate"

What I would like to know is: are there other default reducers availiable?

I understand that I can write my own reducer, but I don't want to end up writing something that already exists and "reinvent the wheel" because I'm sure my wheel won't be as good as the original.

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