hi, I have a cluster of 7 nodes. Every node has 2 maps-lots and 1 reduce slot. Is it possible to force the jobtracker executing only 2 map jobs or 1 reduce job per time? I have found this configuration option: "mapred.reduce.slowstart.completed.maps". I think this will do exactly what I want If I set it to 1.0 if there is only one mapreduce job per time. But whenn there are 2 jobs I think it doesn't work because if the second job is finished with the map part it will maybe execute a reduce job on node where still the first job is running. Or am I wrong? Is there a way to allow executing reduce jobs only if there is no map reduce job on this node?
kind regards
