Hadoop The Definitive Guide By Tom White 3rd Edition Pdf Free Download

There are two opportunities for running the Combiner, both on the map side of processing. (A very good online reference is from Tom White's "Hadoop: The Definitive Guide" - -definitive-guide-tom-white-3rd/chapter-6/shuffle-and-sort )

I haven't gone through the code but in reference to Hadoop : The definitive guide by Tom White 3rd edition, it does mention that if the combiner is specified it will run during the merge phase in the reducer. Following is excerpt from the text:

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