org.apache.giraph.combiner

Class MinimumIntMessageCombiner

java.lang.Object

org.apache.giraph.combiner.MinimumIntMessageCombiner

All Implemented Interfaces:

MessageCombiner<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.IntWritable>

public class MinimumIntMessageCombiner
extends Object
implements MessageCombiner<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.IntWritable>

MessageCombiner that finds the minimum IntWritable

Constructor Summary

Constructors

Constructor and Description
MinimumIntMessageCombiner()

Method Summary

Modifier and Type	Method and Description
void	combine(org.apache.hadoop.io.WritableComparable vertexIndex, org.apache.hadoop.io.IntWritable originalMessage, org.apache.hadoop.io.IntWritable messageToCombine) Combine messageToCombine with originalMessage, by modifying originalMessage.
org.apache.hadoop.io.IntWritable	createInitialMessage() Get the initial message.

Methods inherited from class java.lang.Object

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

Constructor Detail

MinimumIntMessageCombiner

public MinimumIntMessageCombiner()

Method Detail

combine

public void combine(org.apache.hadoop.io.WritableComparable vertexIndex,
                    org.apache.hadoop.io.IntWritable originalMessage,
                    org.apache.hadoop.io.IntWritable messageToCombine)

Description copied from interface: MessageCombiner

Combine messageToCombine with originalMessage, by modifying originalMessage. Note that the messageToCombine object may be reused by the infrastructure, therefore, you cannot directly use it or any objects from it in original message

Specified by:

combine in interface MessageCombiner<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.IntWritable>

Parameters:

vertexIndex - Index of the vertex getting these messages

originalMessage - The first message which we want to combine; put the result of combining in this message

messageToCombine - The second message which we want to combine (object may be reused - do not reference it or its member objects)

createInitialMessage

public org.apache.hadoop.io.IntWritable createInitialMessage()

Description copied from interface: MessageCombiner

Get the initial message. When combined with any other message M, the result should be M.

Specified by:

createInitialMessage in interface MessageCombiner<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.IntWritable>

Returns:

Initial message