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From Arun Allamsetty <arun.allamse...@gmail.com>
Subject Re: Hbase Mapreduce API - Reduce to a file is not working properly.
Date Sat, 02 Aug 2014 06:56:49 GMT

The @Override annotation worked because, without it the reduce method in
the superclass (Reducer) was being invoked, which basically writes the
input from the mapper class to the context object. Try to look up the
source code for the Reducer class online and you'll realize that.

Hope that clears it up.


Sent from a mobile device. Please don't mind the typos.
Hi Shahab,

Thanks for the response.

I have added the @Override and somehow that worked. I have pasted the new
Reducer code below.

Though, I did not understood the difference here, as if what I have done
differently. I might be a very silly reason though.

package com.test.hadoop;

import java.io.IOException;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

public class WordCountReducer extends Reducer<Text, IntWritable, Text,
IntWritable> {

        protected void reduce(Text key, Iterable<IntWritable> values,
                        throws IOException, InterruptedException {

                int sum = 0;
                for (IntWritable val : values) {
                        sum += val.get();
                context.write(key, new IntWritable(sum));

Parkirat Bagga.

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