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
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____________________________________________________________
/ Erwan MAS /\
| mailto:er...@mas.nom.fr |_/
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