mapred.map.multithreadedrunner.threads is the property u r looking for
Michael wrote:
Hi everyone: How do I control the number of threads per mapreduce job. I am using bin/hadoop jar wordcount to run jobs and even though I have found these settings in hadoop-default.xml and changed the values to 1: <name>mapred.tasktracker.map.tasks.maximum</name> <name>mapred.tasktracker.reduce.tasks.maximum</name> The output of the job seems to indicate otherwise. 08/12/26 18:21:12 INFO mapred.JobClient: Job Counters 08/12/26 18:21:12 INFO mapred.JobClient: Launched reduce tasks=1 08/12/26 18:21:12 INFO mapred.JobClient: Rack-local map tasks=12 08/12/26 18:21:12 INFO mapred.JobClient: Launched map tasks=17 08/12/26 18:21:12 INFO mapred.JobClient: Data-local map tasks=4 I have 2 servers running the mapreduce process and the datanode process. Thanks, Michael
