Update DetermineHashedPartitionsJob.java

CombineTextInputFormat instead of TextInputFormat combines multiple splits for a single mapper and reduces the strain on hadoop platform. It greatly improves job completion time as there are fewer number of mappers to bookkeep.
Update IndexGeneratorJob.java

CombineTextInputFormat instead of TextInputFormat combines multiple splits for a single mapper and reduces the strain on hadoop platform. It greatly improves job completion time as there are fewer number of mappers to bookkeep.
Merge pull request #561 from deepujain/master

Improve ingestion MR job completion time.