org.apache.hadoop.examples
Class SecondarySort.Reduce

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Reducer<SecondarySort.IntPair,IntWritable,Text,IntWritable>
      extended by org.apache.hadoop.examples.SecondarySort.Reduce
Enclosing class:
SecondarySort

public static class SecondarySort.Reduce
extends Reducer<SecondarySort.IntPair,IntWritable,Text,IntWritable>

A reducer class that just emits the sum of the input values.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer
Reducer.Context
 
Constructor Summary
SecondarySort.Reduce()
           
 
Method Summary
 void reduce(SecondarySort.IntPair key, Iterable<IntWritable> values, Reducer.Context context)
          This method is called once for each key.
 
Methods inherited from class org.apache.hadoop.mapreduce.Reducer
cleanup, run, setup
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SecondarySort.Reduce

public SecondarySort.Reduce()
Method Detail

reduce

public void reduce(SecondarySort.IntPair key,
                   Iterable<IntWritable> values,
                   Reducer.Context context)
            throws IOException,
                   InterruptedException
Description copied from class: Reducer
This method is called once for each key. Most applications will define their reduce class by overriding this method. The default implementation is an identity function.

Overrides:
reduce in class Reducer<SecondarySort.IntPair,IntWritable,Text,IntWritable>
Throws:
IOException
InterruptedException


Copyright © 2009 The Apache Software Foundation