WordCount 案例 Driver| 学习笔记

开发者学堂课程【Hadoop 分布式计算框架 MapReduce：WordCount 案例 Driver】学习笔记，与课程紧密联系，让用户快速学习知识。

课程地址：https://developer.aliyun.com/learning/course/94/detail/1484

WordCount 案例 Driver

WordCount案例Driver

import

org.apache.hadoop.mapreduce.lib.input.FileInputFormat;

import

org.apache.hadoop.mapreduce.lib.output.FileoutputFormat;

public class wordcountDriver {

public static void main (string[] args) throws IOException，ClassNotFoundException,InterruptedException {

// 1获取配置信息以及封装任务

Configuration configuration = new Configuration ( );

Job job = Job.getInstance (configuration) ;

//2设置 jar 加载路径

job.setJarByClass (wordcountDriver.class) ;

//3设置 map 和 reduce 类

job.setMapperClass (wordcountMapper.class);

job.setReducerClass(wordcountReducer.class) ;

//4设置 map 输出

job.setMapoutputKeyClass (Text.class) ;

job.setMapoutputValueClass (Intwritable.class);