Praveen, You also need to set the property "mapred.map.tasks" to the value derived from the following formula ( mapred.tasktracker.map.tasks.maximum * Number of tasktracker Nodes in your cluster) . I am using Hadoop 0.20.2 and I am able to increase the number of maps using these two mentoined properties. Similar settings apply for the reducer .
-Saket From: praveen.pe...@nokia.com [mailto:praveen.pe...@nokia.com] Sent: Friday, July 01, 2011 1:03 PM To: mapreduce-user@hadoop.apache.org Subject: mapred.tasktracker.map.tasks.maximum is not taking into effect Hi all, I am using hadoop 0.20.2. I am setting the property mapred.tasktracker.map.tasks.maximum = 4 (same for reduce also) on my job conf but I am still seeing max of only 2 map and reduce tasks on each node. I know my machine can run 4 maps and 4 reduce tasks in parallel. Is this a bug in 0.20.2 or am I doing something wrong? Configuration conf = new Configuration(); conf.set("mapred.tasktracker.map.tasks.maximum", "4"); conf.set("mapred.tasktracker.reduce.tasks.maximum", "4"); Thanks Praveen This communication, along with any attachments, may include confidential TouchCommerce Inc. information. Any distribution or copying of this material is strictly prohibited. If you are not the intended recipient of this transmission, please contact the sender immediately.
