oracle.spatial.hadoop.vector.binning.mapreduce

Class BinReducer

java.lang.Object

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

oracle.spatial.hadoop.vector.binning.mapreduce.BinReducer

public class BinReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,RecordInfo,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text>

A subclass of Reducer that collects all the records assigned to a bin. Additionally calculates fields aggregations for each bin and emits the resulting records.

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
BinReducer()

Method Summary

Modifier and Type	Method and Description
protected void	reduce(org.apache.hadoop.io.LongWritable 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

BinReducer

public BinReducer()

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

Throws:

java.io.IOException

java.lang.InterruptedException

reduce

protected void reduce(org.apache.hadoop.io.LongWritable 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<org.apache.hadoop.io.LongWritable,RecordInfo,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text>

Throws:

java.io.IOException

java.lang.InterruptedException