org.apache.hadoop.examples.pi
Class DistSum.ReduceSide.SummingReducer
java.lang.Object
org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,SummationWritable,org.apache.hadoop.io.NullWritable,TaskResult>
org.apache.hadoop.examples.pi.DistSum.ReduceSide.SummingReducer
- Enclosing class:
- DistSum.ReduceSide
public static class DistSum.ReduceSide.SummingReducer
- extends Reducer<org.apache.hadoop.io.IntWritable,SummationWritable,org.apache.hadoop.io.NullWritable,TaskResult>
A Reducer which computes sums
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
DistSum.ReduceSide.SummingReducer
public DistSum.ReduceSide.SummingReducer()
reduce
protected void reduce(org.apache.hadoop.io.IntWritable index,
Iterable<SummationWritable> sums,
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<org.apache.hadoop.io.IntWritable,SummationWritable,org.apache.hadoop.io.NullWritable,TaskResult>
- Throws:
IOException
InterruptedException
Copyright © 2009 The Apache Software Foundation