Increase number of Hive mappers in Hadoop 2

Question

I created a HBase table from Hive and I\'m trying to do a simple aggregation on it. This is my Hive query:

from my_hbase_table 
select col1, count(1) 
group by c         


        

Answer 1

Splitting the HBase table should get your job to use more mappers automatically.

Since you have 2 splits each split is read by one mapper. Increase no. of splits.