Try setting the below in Hive and see what happens..btw what are you configs in hive if any?
set mapred.map.tasks = 20; On Thu, Apr 2, 2015 at 11:01 AM, Erwan MAS <[email protected]> wrote: > Hello , > > I have a issue on hive , with tez engine . When try to execute a query , > with > tez engine , the query is 9 times slower than map/reduce . > > The query is a left outer join on two table using orc storage . > > With map/reduce i have : > Job 0 : Map 27 Reduce 256 > Job 1 : Map 27 Reduce 256 > Time taken 110 sec > > With tez i have : > Map 1 : 1/1 Map 4 : 3/3 Reducer 2: 256/256 Reducer 3: 256/256 > Time taken 930 sec > > With my configuration tez want to use only one mapper for some part . > > How to increase this number of mapper ? > Which variable on hive , i must set to change this behavior ? > > My context : > Hive 0.13 on Hortonworks 2.1 > > -- > ____________________________________________________________ > / Erwan MAS /\ > | mailto:[email protected] |_/ > ___|________________________________________________________ | > \___________________________________________________________\__/ >
