org.apache.giraph.combiner

Class MinimumDoubleMessageCombiner

java.lang.Object

org.apache.giraph.combiner.MinimumDoubleMessageCombiner

All Implemented Interfaces:

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

public class MinimumDoubleMessageCombiner
extends Object
implements MessageCombiner<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.DoubleWritable>

MessageCombiner which finds the minimum of DoubleWritable.

Constructor Summary

Constructors

Constructor and Description
MinimumDoubleMessageCombiner()

Method Summary

Modifier and Type	Method and Description
void	combine(org.apache.hadoop.io.WritableComparable vertexIndex, org.apache.hadoop.io.DoubleWritable originalMessage, org.apache.hadoop.io.DoubleWritable messageToCombine) Combine messageToCombine with originalMessage, by modifying originalMessage.
org.apache.hadoop.io.DoubleWritable	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

MinimumDoubleMessageCombiner

public MinimumDoubleMessageCombiner()

Method Detail

combine

public void combine(org.apache.hadoop.io.WritableComparable vertexIndex,
                    org.apache.hadoop.io.DoubleWritable originalMessage,
                    org.apache.hadoop.io.DoubleWritable 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.DoubleWritable>

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.DoubleWritable 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.DoubleWritable>

Returns:

Initial message