Fail to Increase Hive Mapper Tasks?

Question

I have a managed Hive table, which contains only one 150MB file. I then do \"select count(*) from tbl\" to it, and it uses 2 mappers. I want to set it to a bigger number.

Answer 1

Try adding the following:

set hive.merge.mapfiles=false;
set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat;