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From "Owen O'Malley" <...@yahoo-inc.com>
Subject Re: Controlling the number of simultanious jobs per machine - 0.15.0
Date Mon, 03 Dec 2007 08:52:11 GMT

On Dec 2, 2007, at 11:53 PM, Espen Amble Kolstad wrote:

> AFAIK 0.15.x does not support different
> mapred.tasktracker.tasks.maximum per node. It's a per cluster setting.
> So whatever's in you hadoop-site.xml is what will be used.
>
> I think this is something coming in 0.16.x though.

This change was committed as HADOOP-1245. Furthermore, HADOOP-1274  
allows you to change the number of map slots independently from the  
number of reduce slots, so that you can run more maps without  
clobbering your cluster with reduces.

-- Owen

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