org.apache.hama.graph

Interface Aggregator<M extends org.apache.hadoop.io.Writable,VERTEX extends Vertex<?,?,?>>

All Known Implementing Classes:

AbsDiffAggregator, AbstractAggregator, AverageAggregator, MaxAggregator, MinAggregator, SumAggregator

public interface Aggregator<M extends org.apache.hadoop.io.Writable,VERTEX extends Vertex<?,?,?>>

Aggregators are a mechanism for global communication, monitoring, and data. Each vertex can provide a value to an aggregator in superstep S, the system combines those values using a reduction operator, and the resulting value is made available to all vertices in superstep S + 1.
The result of an aggregator from the last superstep can be picked up by the vertex itself via Vertex#getLastAggregatedValue();

Method Summary

Methods

Modifier and Type	Method and Description
void	aggregate(VERTEX vertex, M value) Observes a new vertex value.
M	getValue() Gets a vertex value.

Method Detail

aggregate

void aggregate(VERTEX vertex,
             M value)

Observes a new vertex value.

getValue

M getValue()

Gets a vertex value.