question Question about combiners in Archives of Support Questions (Read Only)

Question about combiners

Kevin_DElia — Sat, 06 Sep 2014 17:51:26 GMT

Is a combiner always defined in terms of a reducer or is there another way to code the combiner class?

Thanks in advance to all who answer.

Re: Question about combiners

GautamG — Mon, 08 Sep 2014 12:49:17 GMT

Like the definitive guide says "Hadoop allows the user to specify a
combiner function to be run on the map output, and the combiner function’s
output forms the input to the reduce function. "
. Frequently the code in the reducer and combiner is similar but doesn't
have to be.

Your question is unclear.
Can you elaborate a bit?

Re: Question about combiners

Kevin_DElia — Mon, 08 Sep 2014 16:47:44 GMT

Thanks, your answer was fine.