Hadoop combiners with aggregator functions

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When using one of the aggregator function in place of a reducer, will Hadoop be smart enough to use same function for combiner phase?
May 16, 2018 in Big Data Hadoop by Shubham
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1 answer to this question.

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Both combiner & aggregator fulfill partly the same purpose but the aggregator is more generic and can be used in cases where the combiner can not.

So it's a definite no, the aggregator will not be used as a combiner automatically. If you want it to be used as a combiner you will have to specify it as such.

Hope it will help you to some extent.
answered May 16, 2018 by nitinrawat895
• 10,670 points

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