Reduce starts only after all Map task finishes.Reducers pull data from mappers ,but processing is done only after all map get finished. It is better to look into JObtracker UI instead of looking into console. There you can see only after map 100% Reducer starts
-- *Thanks & Regards * *Unmesha Sreeveni U.B* *Hadoop, Bigdata Developer* *Center for Cyber Security | Amrita Vishwa Vidyapeetham* http://www.unmeshasreeveni.blogspot.in/
