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From Arun C Murthy <...@hortonworks.com>
Subject Re: Memory based scheduling
Date Tue, 30 Oct 2012 17:24:26 GMT
Yes, use the CapacityScheduler and ask for multiple slots per map or reduce task:
http://hadoop.apache.org/docs/stable/capacity_scheduler.html#Resource+based+scheduling

Arun

On Oct 30, 2012, at 8:49 AM, Marco Z├╝hlke wrote:

> Hi,
> 
> on our cluster our jobs usually satisfied with less than 2 GB of heap space.
> so we have on our 8 GB computers 3 maps maximum and on our 16 GB
> computers 4 maps maximum (we only have quad core CPUs and to have
> memory left for reducers). This works very well.
> 
> But now we have a new kind of jobs. Each mapper requires at lest 4 GB
> of heap space.
> 
> Is it possible to limit the number of tasks (mapper) per computer to 1 or 2 for
> these kinds of jobs ?
> 
> Regards,
> Marco
> 

--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/



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