-Re: mapred.map.tasks vs mapred.tasktracker.map.tasks.maximum
Mohit Anchlia 2012-03-10, 01:19
What's the difference between setNumMapTasks and mapred.map.tasks?
On Fri, Mar 9, 2012 at 5:00 PM, Chen He <[EMAIL PROTECTED]> wrote:
> Hi Mohit
> " mapred.tasktracker.reduce(map).tasks.maximum " means how many reduce(map)
> slot(s) you can have on each tasktracker.
> "mapred.job.reduce(maps)" means default number of reduce (map) tasks your
> job will has.
> To set the number of mappers in your application. You can write like this:
> *configuration.setNumMapTasks(the number you want);*
> Actually, you can just use configuration.set()
> On Fri, Mar 9, 2012 at 6:42 PM, Mohit Anchlia <[EMAIL PROTECTED]
> > What's the difference between mapred.tasktracker.reduce.tasks.maximum and
> > mapred.map.tasks
> > **
> > I want my data to be split against only 10 mappers in the entire
> > Can I do that using one of the above parameters?