Hive uses map side aggregation instead of combiners http://dev.bizo.com/2013/02/map-side-aggregations-in-apache-hive.html
On Mon, Aug 8, 2016 at 2:59 PM, Edson Ramiro <erlfi...@gmail.com> wrote: > hi all, > > I'm executing TPC-H on Hive 2.0.1, using Yarn 2.7, and I'm wondering if > Hive implements any Combiner by default? If so, how do I enable it? > > I am asking this because I checked the values of COMBINE_INPUT_RECORDS and > COMBINE_OUTPUT_RECORDS and they are always zero. > > Thanks in advance, > > Edson Ramiro >
