Hi, in my cluster mapred.tasktracker.reduce.tasks.maximum = 4 however during monitoring the job in job tracker I see only 1 reducer working
first it is reduce > copy - can someone please explain what does this mean? after it is reduce > reduce when I set the number of reduce tasks for a job programatically to 10 job.setNumReduceTasks(10); the number of "reduce > reduce" reducers increases to 10 and the performance of application increases as well (the number of reducers never exceeds). Can someone explain such behavior? Thanks in Advance, Vitaliy S
