Hi, Following this instructions at http://wiki.apache.org/hadoop/HowManyMapsAndReduces I've read that the best amount of reducers for one process is 0.95 or 1.75 * (nodes * mapred.tasktracker.tasks.maximum) so I would like to call to conf.setNumReduceTasks(int num) according to how many nodes I have working.
So how can I get the number of live nodes from my hadoop code? Thanks in advance, Raimon Bosch.
