I think this does it:
http://hadoop.apache.org/docs/r0.20.1/api/org/apache/hadoop/mapreduce/lib/output/NullOutputFormat.html

On Fri, Dec 7, 2012 at 10:06 AM, Oleg Zhurakousky <oleg.zhurakousky@gmail.com> wrote:
Guys

I have a simple mapper that reads a records and sends out a message as it encounters the ones it is interested in (no reducer). So no output is ever written, but it seems like a job can not be submitted unless Output Path is specified. Not a big deal to specify a dummy one, but was wondering if it could be avoided.

Thanks
Oleg