Int Sum Collector

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Motivation

Learn about Collector before we dig into the MapReduce Lab.

Background

interface Collector<T,A,R>

class MutableInt

Code To Implement

ClassicReducer

class: ClassicReducer.java Java.png
methods: supplier,accumulator,combiner
package: mapreduce.collector.studio
source folder: student/src/main/java

IntSumCollector

class: IntSumCollector.java Java.png
methods: supplier,accumulator,combiner,finisher
package: mapreduce.collector.intsum.studio
source folder: student/src/main/java
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