On Mar 25, 2011, at 10:09 AM, Pedro Costa wrote:
> 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?
Probably speculative execution