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From Ramasubramanian Narayanan <ramasubramanian.naraya...@gmail.com>
Subject Doubt on Input and Output Mapper - Key value pairs
Date Wed, 07 Nov 2012 12:39:01 GMT
Hi,

Which of the following is correct w.r.t mapper.

(a) It accepts a single key-value pair as input and can emit any number of
key-value pairs as output, including zero.
(b) It accepts a single key-value pair as input and emits a single key and
list of corresponding values as output


regards,
Rams

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