oracle.spatial.hadoop.vector.mapred

Class HierarchicalCountReducer

java.lang.Object

org.apache.hadoop.mapred.MapReduceBase

oracle.spatial.hadoop.vector.mapred.HierarchicalCountReducer

All Implemented Interfaces:

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

public class HierarchicalCountReducer
extends org.apache.hadoop.mapred.MapReduceBase
implements org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

A reducer that takes the output generated by SpatialHierarchicalCountMapper and creates a different output for each hierarchy level. MultipleOutputs must have been configured for each hierarchy level using the layer's name as output name.

Constructor Summary

Constructors

Constructor and Description
HierarchicalCountReducer()

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

HierarchicalCountReducer

public HierarchicalCountReducer()

Method Detail

configure

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

Specified by:

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

Overrides:

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

reduce

public void reduce(org.apache.hadoop.io.Text key,
                   java.util.Iterator<org.apache.hadoop.io.LongWritable> values,
                   org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.NullWritable,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<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

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

Throws:

java.io.IOException