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From Saket Joshi <sjo...@touchcommerce.com>
Subject RE: mapred.tasktracker.map.tasks.maximum is not taking into effect
Date Tue, 05 Jul 2011 19:02:35 GMT

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 .


From: praveen.peddi@nokia.com [mailto:praveen.peddi@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");


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