You might be interested in Apache Tez which provides native support for these sort of scenarios by being a super-set of MapReduce:
http://tez.incubator.apache.org/ Arun 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 Hortonworks Inc. http://hortonworks.com/ -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
