org.apache.hadoop.examples.pi

Class DistSum.ReduceSide.IndexPartitioner

java.lang.Object

org.apache.hadoop.mapreduce.Partitioner<IntWritable,SummationWritable>

org.apache.hadoop.examples.pi.DistSum.ReduceSide.IndexPartitioner

Enclosing class:

DistSum.ReduceSide

public static class DistSum.ReduceSide.IndexPartitioner
extends Partitioner<IntWritable,SummationWritable>

Use the index for partitioning.

Constructor Summary

Constructors

Constructor and Description
DistSum.ReduceSide.IndexPartitioner()

Method Summary

Methods

Modifier and Type	Method and Description
int	getPartition(IntWritable index, SummationWritable value, int numPartitions) Return the index as the partition.

Methods inherited from class java.lang.Object

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

Constructor Detail

DistSum.ReduceSide.IndexPartitioner

public DistSum.ReduceSide.IndexPartitioner()

Method Detail

getPartition

public int getPartition(IntWritable index,
               SummationWritable value,
               int numPartitions)

Return the index as the partition.

Specified by:

getPartition in class Partitioner<IntWritable,SummationWritable>

Parameters:

index - the key to be partioned.

value - the entry value.

numPartitions - the total number of partitions.

Returns:

the partition number for the key.