How to increase the mapper number in my case

[Todd]

Hi,

I have Hadoop (2.6.0, pseudo distributed mode) and Hive (1.2.1) installed on my 
local machine. I have a table A,its underlying file takes up 8 HDFS blocks.
When I run a query like
select count(1) from A

From the result, I see only 1 mapper task ,I thought it should be equal to the 
block numbers.

How could I configure to make the mapper number to be equal to the block 
numbers?

Thanks!