Hi all, What is the policy of choosing a node for a reducer in mapreduce (Hadoop v1.2.0)? For example, If a cluster has 5 slaves, each slave can serve 2 maps and 2 reduces , there is a job who occupies 5 mappers and 3 reducers , how does the jobtracker assign reducers to these nodes (choosing free slaves or placing reducers close to mappers)?
Thanks.
