oracle.spatial.hadoop.vector.cluster.kmeans.mapred

Class ClusterCenterReducer

java.lang.Object

org.apache.hadoop.mapred.MapReduceBase

oracle.spatial.hadoop.vector.cluster.kmeans.mapred.ClusterCenterReducer

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Reducer<ClusterInfo,RecordInfo,ClusterInfo,org.apache.hadoop.io.NullWritable>

public class ClusterCenterReducer
extends org.apache.hadoop.mapred.MapReduceBase
implements org.apache.hadoop.mapred.Reducer<ClusterInfo,RecordInfo,ClusterInfo,org.apache.hadoop.io.NullWritable>

A subclass of Reducer that updates a cluster center based on its members locations, determines if the cluster center converges and emits the updated cluster information.

Constructor Summary

Constructors

Constructor and Description
ClusterCenterReducer()

Method Summary

Methods

Modifier and Type	Method and Description
void	configure(org.apache.hadoop.mapred.JobConf jobConf)
void	reduce(ClusterInfo key, java.util.Iterator<RecordInfo> values, org.apache.hadoop.mapred.OutputCollector<ClusterInfo,org.apache.hadoop.io.NullWritable> output, org.apache.hadoop.mapred.Reporter reporter)

Methods inherited from class org.apache.hadoop.mapred.MapReduceBase

close

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.Closeable

close

Constructor Detail

ClusterCenterReducer

public ClusterCenterReducer()

Method Detail

configure

public void configure(org.apache.hadoop.mapred.JobConf jobConf)

Specified by:

configure in interface org.apache.hadoop.mapred.JobConfigurable

Overrides:

configure in class org.apache.hadoop.mapred.MapReduceBase

reduce

public void reduce(ClusterInfo key,
                   java.util.Iterator<RecordInfo> values,
                   org.apache.hadoop.mapred.OutputCollector<ClusterInfo,org.apache.hadoop.io.NullWritable> output,
                   org.apache.hadoop.mapred.Reporter reporter)
            throws java.io.IOException

Specified by:

reduce in interface org.apache.hadoop.mapred.Reducer<ClusterInfo,RecordInfo,ClusterInfo,org.apache.hadoop.io.NullWritable>

Throws:

java.io.IOException