hadoop Idea Win本地运行

最新推荐文章于 2023-02-12 09:49:00 发布

Claroja

最新推荐文章于 2023-02-12 09:49:00 发布

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win提交local,做测试用

package WordCount;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.log4j.BasicConfigurator;

public class WinS {
    public static void main(String[] args) throws Exception {
        BasicConfigurator.configure(); //自动快速地使用缺省Log4j环境。
        Configuration conf = new Configuration();//
        //默认在本地运行,这里会直接读取win里里面的hadoop配置,所以可以把conf.set省略
//        conf.set("fs.defaultFS", "file:///");
//        conf.set("mapreduce.framework.name", "local");
        Job job = Job.getInstance(conf);
        //mapper,reducer,submitter三个类
        job.setJarByClass(WinS.class);
        job.setMapperClass(CountMapper.class);
        job.setReducerClass(CountReducer.class);
        //mapper,reducer输出key和value的类型
        job.setMapOutputKeyClass(Text.class);//mapper
        job.setMapOutputValueClass(IntWritable.class);
        job.setOutputKeyClass(Text.class);//reducer
        job.setOutputValueClass(IntWritable.class);
        FileInputFormat.setInputPaths(job, new Path("d:/input"));
        FileOutputFormat.setOutputPath(job, new Path("d:/output"));
        job.setNumReduceTasks(3);
        boolean res = job.waitForCompletion(true);
        System.exit(res?0:1);
    }
}