pegasus.mapreduce.subgraph

Class PrePartition.PGReducer

java.lang.Object

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

pegasus.mapreduce.subgraph.PrePartition.PGReducer

Enclosing class:

PrePartition

public static class PrePartition.PGReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.ShortWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

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
PGReducer()

Method Summary

Modifier and Type	Method and Description
protected void	reduce(org.apache.hadoop.io.ShortWritable edgeColor, java.lang.Iterable<org.apache.hadoop.io.LongWritable> edges, org.apache.hadoop.mapreduce.Reducer.Context context) The reduce function of pre-partitioning
protected void	setup(org.apache.hadoop.mapreduce.Reducer.Context context) setup before execution.

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

PGReducer

public PGReducer()

Method Detail

setup

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

setup before execution.

Overrides:

setup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.ShortWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Parameters:

context - of hadoop

Throws:

java.io.IOException - by hadoop

java.lang.InterruptedException - by hadoop

reduce

protected void reduce(org.apache.hadoop.io.ShortWritable edgeColor,
                      java.lang.Iterable<org.apache.hadoop.io.LongWritable> edges,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws java.io.IOException,
                      java.lang.InterruptedException

The reduce function of pre-partitioning

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.ShortWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Parameters:

edgeColor - the color of edges (u, v). (color(u) * numColors + color(v))

edges - edges of the edge color

context - of hadoop

Throws:

java.io.IOException - by hadoop

java.lang.InterruptedException - by hadoop