MR1 has the concept of "map and reduce slots" (i.e. different types of
slots) - but it does not run maps in reducer allocated slots - they
are exclusive for reducers of any job to run.
YARN, on which MR2 runs, has no notion of dedicated slots (for M or R types).
On Sat, Dec 29, 2012 at 6:51 PM, Pedro Sá da Costa <[EMAIL PROTECTED]> wrote:
> MapReduce framework has map and reduce slots, that are used to track which
> tasks are running. When map tasks are just running, the reduce slots that
> the job have will be filled by map tasks?
> Best regards,