eu.stratosphere.example.java.record.triangles

Class ComputeEdgeDegrees.CountEdges

java.lang.Object

eu.stratosphere.api.common.functions.AbstractFunction

eu.stratosphere.api.java.record.functions.ReduceFunction

eu.stratosphere.example.java.record.triangles.ComputeEdgeDegrees.CountEdges

All Implemented Interfaces:

Function, GenericReducer<Record,Record>, Serializable

Enclosing class:

ComputeEdgeDegrees

public static final class ComputeEdgeDegrees.CountEdges
extends ReduceFunction
implements Serializable

Creates for all records in the group a record of the form (v1, v2, c1, c2), where v1 is the lexicographically smaller vertex id and the count for the vertex that was the key contains the number of edges associated with it. The other count is zero. This reducer also eliminates duplicate edges.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ComputeEdgeDegrees.CountEdges()

Method Summary

Methods

Modifier and Type	Method and Description
void	reduce(Iterator<Record> records, Collector<Record> out)

Methods inherited from class eu.stratosphere.api.java.record.functions.ReduceFunction

combine

Methods inherited from class eu.stratosphere.api.common.functions.AbstractFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Methods inherited from interface eu.stratosphere.api.common.functions.Function

close, getRuntimeContext, open, setRuntimeContext

Constructor Detail

ComputeEdgeDegrees.CountEdges

public ComputeEdgeDegrees.CountEdges()

Method Detail

reduce

public void reduce(Iterator<Record> records,
          Collector<Record> out)
            throws Exception

Specified by:

reduce in interface GenericReducer<Record,Record>

Specified by:

reduce in class ReduceFunction

Throws:

Exception