Song, > HOD is good, and can manage a large virtual cluster on a huge physical > cluster. but the problem is, it doesnt apply more than one core for each > machine, and I have already recieved complaint from our admin! >
I assume what you want is the Map/Reduce cluster that is started by HOD to use more than core on each machine. You can configure this in the gridservice-mapred section, setting the property server-params. For example, if you want to configure 4 map and 2 reduce slots per node, you can say: [gridservice-mapred] server-params = mapred.tasktracker.map.tasks.maximum=4,mapred.tasktracker.reduce.tasks.maximum=2, That said, since you have not specified any values for these parameters, Hadoop's defaults should be picked up, and they default to 2 map and 2 reduce slots. Hence, it should already be using more than one core. Are you seeing that the JobTracker administration page is not showing multiple map and reduce slots per node ?
