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From Prasan Ary <voicesnthed...@yahoo.com>
Subject Map/Reduce Type Mismatch error
Date Fri, 07 Mar 2008 23:50:02 GMT
  Hi All,
  I am running a Map/Reduce on a textfile.
  Map takes <Text,Text> as (key,value) input pair , and outputs <Text,IntWritable>
as (key,value) output pair.
   
  Reduce takes <Text,IntWritable> as (key,value) input pair, and outputs <Text,Text>
as (key,value) output pair.
   
  I am getting a type mismatch error.
   
  Any suggestion?
   
   
  JobConf job = new JobConf(..............
   
  job.setOutputKeyClass(Text.class); 
  job.setOutputValueClass(Text.class); 
   
  -----------------------------
  public static class Map extends MapReduceBase implements Mapper<Text, Text, Text, IntWritable>
{
    ......
    public void map(Text key, Text value, OutputCollector<Text, IntWritable> output,
Reporter reporter) throws IOException { ......
   
  output.collect(key,new IntWritable(1));
   
  ----------------------------
   
  public static class Reduce extends MapReduceBase implements Reducer<Text, IntWritable,
Text, Text> { 
  public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text,Text>
output, Reporter reporter) throws IOException {  ..............
   
  output.collect(key, new Text("SomeText");

       
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