The number of slots corresponds to the number of cores (e.g., a 10-node cluster
consisting of quad-core cpus has 40 cores and therefore 40 slots). The slots
can be divided amongst the maps and reduces in a way which integer-divides into
the cores of a single machine. So if the nodes are quad-cores you can do 3:1,
2:2, or 1:3. If the nodes are dual-quad-cores (each node has eight cores) you
can do 7:1 through 1:7 in any configuration you want..........as per my
understanding. Others may pipe in to clarify some minor point I have missed,
I'm unsure.
On Jun 4, 2012, at 09:06 , kartheek muthyala wrote:
> Hello all,
>
> Can I increase the number of map slots in a machine using some
> configuration?. I can find configurations for increasing the number of
> maps and reduce tasks that can run, but didn't find anything related
> to slots. Is that default decided based on the memory size?
>
> Thanks,
> Kartheek.
________________________________________________________________________________
Keith Wiley kwi...@keithwiley.com keithwiley.com music.keithwiley.com
"I do not feel obliged to believe that the same God who has endowed us with
sense, reason, and intellect has intended us to forgo their use."
-- Galileo Galilei
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