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Posted to mapreduce-user@hadoop.apache.org by Anty <an...@gmail.com> on 2012/01/13 03:01:14 UTC

MapReduce Job don't need sort.

Hi All
       Does any queries/jobs do not need sort phase? I can only think
of aggregation.

-- 
Best Regards
Anty Rao

Re: MapReduce Job don't need sort.

Posted by Radim Kolar <hs...@sendmail.cz>.

 > Does any queries/jobs do not need sort phase? I can only think of 
aggregation.
If you are talking about sorting keys before feeding them to reduce, 
then yes. almost none of my jobs needs sorted keys in reducer, 
aggregation only should be enough.