Can I define different number for map and reduce slots for each node?

Question

I want to know if I can define different number of slots for each node in hadoop cluster.
for ex: tasktracker1 : 2 map and 2 reduce
tasktracker2 : 1 map and 1 reduce
and so on...

Or I have to set number of slots for all nodes in the cluster

thanks so much,,

Note: I use hadoop version : 1.2.1 as it is the latest stable version but if there is any version can do that please tell me about

Answer 1

Take a look at mapreduce.tasktracker.map.tasks.maximum and mapreduce.tasktracker.reduce.tasks.maximum. They're both set in mapred-site.xml.

There are many configuration parameters to play with in the configuration for map reduce jobs in hadoop. Some depend on the version you're using.