org.apache.giraph.examples

Class SimpleShortestPathsComputation

java.lang.Object

org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable<I,V,E>

org.apache.giraph.worker.WorkerAggregatorDelegator<I,V,E>

org.apache.giraph.graph.AbstractComputation<I,V,E,M,M>

org.apache.giraph.graph.BasicComputation<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.DoubleWritable>

org.apache.giraph.examples.SimpleShortestPathsComputation

All Implemented Interfaces:

AggregatorUsage, GiraphConfigurationSettable<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable>, ImmutableClassesGiraphConfigurable<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable>, TypesHolder<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.DoubleWritable>, Computation<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.DoubleWritable>, WorkerAggregatorUsage, WorkerBroadcastUsage, WorkerGlobalCommUsage, WorkerIndexUsage<org.apache.hadoop.io.LongWritable>, WorkerReduceUsage

public class SimpleShortestPathsComputation
extends BasicComputation<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.DoubleWritable>

Demonstrates the basic Pregel shortest paths implementation.

Field Summary

Fields

Modifier and Type	Field and Description
static LongConfOption	SOURCE_ID The shortest paths id

Constructor Summary

Constructors

Constructor and Description
SimpleShortestPathsComputation()

Method Summary

Modifier and Type	Method and Description
void	compute(Vertex<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable> vertex, Iterable<org.apache.hadoop.io.DoubleWritable> messages) Must be defined by user to do computation on a single Vertex.

Methods inherited from class org.apache.giraph.graph.AbstractComputation

addEdgeRequest, addVertexRequest, addVertexRequest, getContext, getMyWorkerIndex, getSuperstep, getTotalNumEdges, getTotalNumVertices, getWorkerContext, getWorkerCount, getWorkerForVertex, initialize, postSuperstep, preSuperstep, removeEdgesRequest, removeVertexRequest, sendMessage, sendMessageToAllEdges, sendMessageToMultipleEdges

Methods inherited from class org.apache.giraph.worker.WorkerAggregatorDelegator

aggregate, getAggregatedValue, getBroadcast, reduce, reduceMerge, setWorkerGlobalCommUsage

Methods inherited from class org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.giraph.conf.ImmutableClassesGiraphConfigurable

getConf

Methods inherited from interface org.apache.giraph.conf.GiraphConfigurationSettable

setConf

Methods inherited from interface org.apache.giraph.worker.WorkerBroadcastUsage

getBroadcast

Methods inherited from interface org.apache.giraph.worker.WorkerReduceUsage

reduce, reduceMerge

Methods inherited from interface org.apache.giraph.worker.WorkerAggregatorUsage

aggregate

Methods inherited from interface org.apache.giraph.aggregators.AggregatorUsage

getAggregatedValue

Field Detail

SOURCE_ID

public static final LongConfOption SOURCE_ID

The shortest paths id

Constructor Detail

SimpleShortestPathsComputation

public SimpleShortestPathsComputation()

Method Detail

compute

public void compute(Vertex<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable> vertex,
                    Iterable<org.apache.hadoop.io.DoubleWritable> messages)
             throws IOException

Description copied from class: AbstractComputation

Must be defined by user to do computation on a single Vertex.

Specified by:

compute in interface Computation<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.DoubleWritable>

Specified by:

compute in class AbstractComputation<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.DoubleWritable>

Parameters:

vertex - Vertex

messages - Messages that were sent to this vertex in the previous superstep. Each message is only guaranteed to have a life expectancy as long as next() is not called.

Throws:

IOException