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Date: Tue, 29 Nov 2011 20:15:14 +0530
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 <CACD21EM1Udm+wmTRiG1DmRxoygA81K3_HTorZY6JOe9REQSXKQ@mail.gmail.com>
Subject: Re: Multiple reducers
From: Bejoy Ks <bejoy.hadoop@gmail.com>
To: common-user@hadoop.apache.org
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Hi Hoot

You can specify the number of reducers explicitly using -D
mapred.reduce.tasks=3Dn.

hadoop jar wordcount.jar com.wc.WordCount =96D mapred.reduce.tasks=3Dn /inp=
ut
/output

Currenty your word count is triggering just 1 reducer because the defaukt
value of mapred.reduce.tasks woulld be set as 1 in your configuration file

Hope it helps !.

Regards
Bejoy.K.S

On Tue, Nov 29, 2011 at 8:03 PM, Hoot Thompson <hoot@ptpnow.com> wrote:

> I'm trying to prove that my cluster will in fact support multiple reducer=
s,
> the wordcount example doesn't seem to spawn more that one (1). Is that
> correct? Is there a sure fire way to prove my cluster is configured
> correctly in terms of launching the maximum (say two per node) number of
> mappers and reducers?
>
> Thanks!
>
>
>

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