title: ElasticMapReduce: number of mappers/reducers per EC2 type
body: <p>I am wondering whether the number of mappers and reducers would be different based on the instance type of EC2 servers you choose? I found Large instance is using 3 mappers and 1 reducers. Would that be the same for every other type (for example, xLarge instance)? I know I can override it thru bootstraping but just wondering. </p>