Hi, during the setup phase and the cleanup phase of the tasks, the Hadoop MR uses map tasks to do it. These tasks appears in the counters shown at the end of an example? For example, the counter below shows that my example ran 9 map tasks and 2 reduce tasks, but the Launched map task has the value 13. The 4 more tasks are the one used at setup and cleanup phase?
[code] 11/03/25 17:04:26 INFO mapred.JobClient:532 Launched reduce tasks=2 11/03/25 17:04:26 INFO mapred.JobClient:532 Total number map tasks=9 11/03/25 17:04:26 INFO mapred.JobClient:532 Launched map tasks=13 11/03/25 17:04:26 INFO mapred.JobClient:532 Data-local map tasks=9 [/code] -- Pedro
