Hi Mohit, No of Maps - It depends on what is the Total File Size / Block Size No of Reducers - You can specify.
Regards, Jagaran ________________________________ From: Mohit Anchlia <mohitanch...@gmail.com> To: common-user@hadoop.apache.org Sent: Thu, 26 May, 2011 2:48:20 PM Subject: No. of Map and reduce tasks How can I tell how the map and reduce tasks were spread accross the cluster? I looked at the jobtracker web page but can't find that info. Also, can I specify how many map or reduce tasks I want to be launched? From what I understand is that it's based on the number of input files passed to hadoop. So if I have 4 files there will be 4 Map taks that will be launced and reducer is dependent on the hashpartitioner.
