On Dec 2, 2007, at 11:53 PM, Espen Amble Kolstad wrote:
AFAIK 0.15.x does not support different mapred.tasktracker.tasks.maximum per node. It's a per cluster setting. So whatever's in you hadoop-site.xml is what will be used. I think this is something coming in 0.16.x though.
This change was committed as HADOOP-1245. Furthermore, HADOOP-1274 allows you to change the number of map slots independently from the number of reduce slots, so that you can run more maps without clobbering your cluster with reduces.
-- Owen
