hive-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: does Hive implement any Combiner by default?
Date Mon, 08 Aug 2016 19:00:14 GMT
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 <erlfilho@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
>

Mime
View raw message