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From Christian Ulrik S√łttrup <soett...@nbi.dk>
Subject Re: Can a MapReduce task only consist of a Map step?
Date Mon, 21 Jul 2008 09:09:31 GMT
Hi,

you can simply use the built in reducer that just copies the map output:

conf.setReducerClass(org.apache.hadoop.mapred.lib.IdentityReducer.class);

Cheers,
Christian

Zhou, Yunqing wrote:
> I only use it to do something in parallel,but the reduce step will cost me
> additional several days, is it possible to make hadoop do not use a reduce
> step?
>
> Thanks
>
>   


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