oracle.spatial.hadoop.vector.cluster.kmeans.mapreduce

Class KMeansReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<ClusterInfo,RecordInfo,ClusterInfo,org.apache.hadoop.io.NullWritable>

oracle.spatial.hadoop.vector.cluster.kmeans.mapreduce.KMeansReducer

public class KMeansReducer
extends org.apache.hadoop.mapreduce.Reducer<ClusterInfo,RecordInfo,ClusterInfo,org.apache.hadoop.io.NullWritable>

updates a cluster center based on its members locations, determines if the cluster center converges and emits the updated cluster information.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

Constructors

Constructor and Description
KMeansReducer()

Method Summary

Modifier and Type	Method and Description
protected void	reduce(ClusterInfo key, java.lang.Iterable<RecordInfo> values, org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	setup(org.apache.hadoop.mapreduce.Reducer.Context context)

Methods inherited from class org.apache.hadoop.mapreduce.Reducer

cleanup, run

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

KMeansReducer

public KMeansReducer()

Method Detail

setup

protected void setup(org.apache.hadoop.mapreduce.Reducer.Context context)
              throws java.io.IOException,
                     java.lang.InterruptedException

Overrides:

setup in class org.apache.hadoop.mapreduce.Reducer<ClusterInfo,RecordInfo,ClusterInfo,org.apache.hadoop.io.NullWritable>

Throws:

java.io.IOException

java.lang.InterruptedException

reduce

protected void reduce(ClusterInfo key,
                      java.lang.Iterable<RecordInfo> values,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws java.io.IOException,
                      java.lang.InterruptedException

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<ClusterInfo,RecordInfo,ClusterInfo,org.apache.hadoop.io.NullWritable>

Throws:

java.io.IOException

java.lang.InterruptedException