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Hadoop, mail # user - Identity Reducer


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Re: Identity Reducer
Aaron Kimball 2010-02-12, 04:55
Can you post the entire exception with its accompanying stack trace?
- Aaron

On Thu, Feb 11, 2010 at 5:26 PM, Prabhu Hari Dhanapal <
[EMAIL PROTECTED]> wrote:

> @ Jeff
> I seem to have used the Mapper you are pointing to ...
>
>
> import org.apache.hadoop.mapred.MapReduceBase;
> import org.apache.hadoop.mapred.Mapper;
>
> Will that affect the Reducer in any sense?
>
>
> On Thu, Feb 11, 2010 at 8:19 PM, Jeff Zhang <[EMAIL PROTECTED]> wrote:
>
> > I guess you are using org.apache.hadoop.mapreduce.Mapper which is a class
> > for hadoop new API. you can use the org.apache.hadoop.mapred.Mapper which
> > is
> > for old API
> >
> >
> >
> > On Thu, Feb 11, 2010 at 5:10 PM, Prabhu Hari Dhanapal <
> > [EMAIL PROTECTED]> wrote:
> >
> > > Hi all,
> > >
> > > I m trying to Write a program that performs some simple Datamining on a
> > > certain DataSet. I was told that an Identity Reducer should be written.
> > >
> > > public class Reduce extends MapReduceBase implements Reducer {
> > >
> > > public void reduce(Text key, Iterator<IntWritable>
> > > values,OutputCollector<Text, IntWritable> output,
> > >  Reporter reporter) throws IOException {
> > >
> > > ===>
> > > It shows me the following exception  ..
> > >
> > > "The type Reducer cannot be a superinterface of Reduce; a
> superinterface
> > > must be an interface "
> > > Can I have some pointers on solving this?
> > >
> > >
> > > --
> > > Hari
> > >
> >
> >
> >
> > --
> > Best Regards
> >
> > Jeff Zhang
> >
>
>
>
> --
> Hari
>