[KIP-DISCUSSION] KIP-22 Expose a Partitioner interface in the new producer

[Sriharsha Chintalapani]

Hi,
        Here is the KIP for adding a partitioner interface for producer.
https://cwiki.apache.org/confluence/display/KAFKA/KIP-+22+-+Expose+a+Partitioner+interface+in+the+new+producer
There is one open question about how interface should look like. Please take a 
look and let me know if you prefer one way or the other.

Thanks,
Harsha