eu.stratosphere.example.java.record.pagerank

Class DotProductCoGroup

java.lang.Object

eu.stratosphere.api.common.functions.AbstractFunction

eu.stratosphere.api.java.record.functions.CoGroupFunction

eu.stratosphere.example.java.record.pagerank.DotProductCoGroup

All Implemented Interfaces:

Function, GenericCoGrouper<Record,Record,Record>, Serializable

public class DotProductCoGroup
extends CoGroupFunction
implements Serializable

In schema is_ INPUT = (pageId, currentRank, dangling), (pageId, partialRank). OUTPUT = (pageId, newRank, dangling)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	AGGREGATOR_NAME
static String	NUM_DANGLING_VERTICES_PARAMETER
static String	NUM_VERTICES_PARAMETER

Constructor Summary

Constructors

Constructor and Description
DotProductCoGroup()

Method Summary

Methods

Modifier and Type	Method and Description
void	coGroup(Iterator<Record> currentPageRankIterator, Iterator<Record> partialRanks, Collector<Record> collector)
void	open(Configuration parameters)

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

combineFirst, combineSecond

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

close, getIterationRuntimeContext, getRuntimeContext, 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, setRuntimeContext

Field Detail

NUM_VERTICES_PARAMETER

public static final String NUM_VERTICES_PARAMETER

See Also:

Constant Field Values

NUM_DANGLING_VERTICES_PARAMETER

public static final String NUM_DANGLING_VERTICES_PARAMETER

See Also:

Constant Field Values

AGGREGATOR_NAME

public static final String AGGREGATOR_NAME

See Also:

Constant Field Values

Constructor Detail

DotProductCoGroup

public DotProductCoGroup()

Method Detail

open

public void open(Configuration parameters)
          throws Exception

Specified by:

open in interface Function

Overrides:

open in class AbstractFunction

Throws:

Exception

coGroup

public void coGroup(Iterator<Record> currentPageRankIterator,
           Iterator<Record> partialRanks,
           Collector<Record> collector)

Specified by:

coGroup in interface GenericCoGrouper<Record,Record,Record>

Specified by:

coGroup in class CoGroupFunction