org.apache.hadoop.mapreduce.lib.reduce
Class LongSumReducer<KEY>

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Reducer<KEY,LongWritable,KEY,LongWritable>
      extended by org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer<KEY>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class LongSumReducer<KEY>
extends Reducer<KEY,LongWritable,KEY,LongWritable>


Constructor Summary
LongSumReducer()
           
 
Method Summary
 void reduce(KEY key, Iterable<LongWritable> values, org.apache.hadoop.mapreduce.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

LongSumReducer

public LongSumReducer()
Method Detail

reduce

public void reduce(KEY key,
                   Iterable<LongWritable> values,
                   org.apache.hadoop.mapreduce.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<KEY,LongWritable,KEY,LongWritable>
Throws:
IOException
InterruptedException


Copyright © 2012 Apache Software Foundation. All Rights Reserved.