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From Bejoy Ks <bejoy.had...@gmail.com>
Subject Re: what's the default reducer number?
Date Tue, 11 Sep 2012 11:30:57 GMT
Hi Lin

The default value for number of reducers is 1

<name>mapred.reduce.tasks</name>
  <value>1</value>

It is not determined by data volume. You need to specify the number of
reducers for your mapreduce jobs as per your data volume.

Regards
Bejoy KS

On Tue, Sep 11, 2012 at 4:53 PM, Jason Yang <lin.yang.jason@gmail.com>wrote:

> Hi, all
>
> I was wondering what's the default number of reducer if I don't set it in
> configuration?
>
> Will it change dynamically according to the output volume of Mapper?
>
> --
> YANG, Lin
>
>

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