This is supposed to be a generic option. You should be able to specify Hadoop 
options such as this on the command line invocation of your favorite Mahout 
routine, but I'm having a similar problem setting -Dmapred.reduce.tasks=10 with 
Canopy and k-Means. This is both with and without a space after the -D.

Can someone point me to a Mahout command where this does work? Both drivers 
extend AbstractJob and do the usual option processing pushups. I don't have 
Hadoop source locally so I can't debug the generic options parsing.

-----Original Message-----
From: beneo_7 [mailto:[email protected]] 
Sent: Monday, December 27, 2010 10:45 PM
To: [email protected]
Subject: where i can set -Dmapred.map.tasks=X

i read onMahout in Action that I should set -Dmapred.map.tasks=X
but it did not work for hadoop

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