Nope. You can use the Standalone setup too to test things. Details here:
http://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-common/SingleNodeSetup.html#Standalone_Operation

Regards,
Shahab

On Fri, Feb 20, 2015 at 12:40 AM, Jonathan Aquilina <[email protected]
> wrote:

>  Hey guys Is it safe to guess that one would need a single node setup to
> be able to write mappers and reducers for hadoop?
>
>
>
> --
> Regards,
> Jonathan Aquilina
> Founder Eagle Eye T
>
>

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