oracle.spatial.hadoop.vector.mapreduce

Class HierarchicalCountReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

oracle.spatial.hadoop.vector.mapreduce.HierarchicalCountReducer

public class HierarchicalCountReducer
extends org.apache.hadoop.mapreduce.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.

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
HierarchicalCountReducer()

Method Summary

Methods

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

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

run

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

setup

public 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<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Throws:

java.io.IOException

java.lang.InterruptedException

reduce

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

Overrides:

reduce in class org.apache.hadoop.mapreduce.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

java.lang.InterruptedException

cleanup

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

Overrides:

cleanup in class org.apache.hadoop.mapreduce.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

java.lang.InterruptedException