You might be interested in Apache Tez which provides native support for these sort of scenarios by being a super-set of MapReduce:
On Oct 16, 2013, at 1:16 AM, Anh Pham <[EMAIL PROTECTED]> wrote:
> (Please correct me if I am wrong) So the original chain is:
> InputSplits-->Mapper--> [Sorting/Shuffling, etc]-->Reducer-->...
> Now I don't want the input splits to get to the Mappers first, but to go to
> some other new stage instead (we can call it Pre-Mapper for example, this
> class will be created by myself).
> So the new order will be: InputSplits -> Pre-Mapper->Mapper ->...
> I'm currently reading the source code. However, I still cannot find any
> clue (what classes I should touch). Any suggestion is welcome. Thank you
> very much :)
Arun C. Murthy
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