eu.stratosphere.hadoopcompatibility.example

Class WordCountWithHadoopOutputFormat.CountWords

java.lang.Object

eu.stratosphere.api.common.functions.AbstractFunction

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

eu.stratosphere.hadoopcompatibility.example.WordCountWithHadoopOutputFormat.CountWords

All Implemented Interfaces:

eu.stratosphere.api.common.functions.Function, eu.stratosphere.api.common.functions.GenericCombine<eu.stratosphere.types.Record>, eu.stratosphere.api.common.functions.GenericGroupReduce<eu.stratosphere.types.Record,eu.stratosphere.types.Record>, Serializable

Enclosing class:

WordCountWithHadoopOutputFormat

public static class WordCountWithHadoopOutputFormat.CountWords
extends ReduceFunction
implements Serializable

Sums up the counts for a certain given key. The counts are assumed to be at position 1 in the record. The other fields are not modified.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
CountWords()

Method Summary

Modifier and Type	Method and Description
void	combine(Iterator<eu.stratosphere.types.Record> records, eu.stratosphere.util.Collector<eu.stratosphere.types.Record> out)
void	reduce(Iterator<eu.stratosphere.types.Record> records, eu.stratosphere.util.Collector<eu.stratosphere.types.Record> out)

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

CountWords

public CountWords()

Method Detail

reduce

public void reduce(Iterator<eu.stratosphere.types.Record> records,
                   eu.stratosphere.util.Collector<eu.stratosphere.types.Record> out)
            throws Exception

Specified by:

reduce in interface eu.stratosphere.api.common.functions.GenericGroupReduce<eu.stratosphere.types.Record,eu.stratosphere.types.Record>

Specified by:

reduce in class ReduceFunction

Throws:

Exception

combine

public void combine(Iterator<eu.stratosphere.types.Record> records,
                    eu.stratosphere.util.Collector<eu.stratosphere.types.Record> out)
             throws Exception

Specified by:

combine in interface eu.stratosphere.api.common.functions.GenericCombine<eu.stratosphere.types.Record>

Overrides:

combine in class ReduceFunction

Throws:

Exception