Look at WordCount.java in src/examples/org/apache/hadoop/examples. Whether
you need a new InputFormat depends on what you want to do.
Amar
On Fri, 7 Mar 2008, Prasan Ary wrote:
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");
---------------------------------
Never miss a thing. Make Yahoo your homepage.
