谁能帮我找出为什么在运行我的 MapReduce 代码后我没有得到平均工资。
问题:计算正式员工和契约(Contract)员工的平均工资

示例输入:
1 用户 1 永久 100
2 user2 契约(Contract) 500
3 用户 3 永久 200
4 user4 合约 300

预期输出:
永久 285
契约(Contract)187

我得到的输出:
永久 100
永久 200
合约500
契约(Contract)300

运行作业: $ hadoop jar partition.jar com.hadoop.PartitionExample 输入/partition_example.txt输出

package com.hadoop;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;


public class PartitionExample {
        public static class MapClass extends Mapper<LongWritable, Text, 
        Text, IntWritable>{

        Text outKey = new Text(); ;
        IntWritable outValue = new IntWritable();

        public void map(LongWritable key, Text value, Context context) 
        throws IOException, InterruptedException{
            String[] colmn = value.toString().split(" ");
            outKey.set(colmn[2]);           
            outValue.set(Integer.parseInt(colmn[3])); 
            context.write(outKey, outValue);
     }
}
// permanent      [100,300,200,400]
public static class ReduceClass extends Reducer<Text,IntWritable,Text, 
IntWritable>{
        IntWritable outValue = new IntWritable();
        public void Reduce(Text key, Iterable<IntWritable> value, Context 
        context) throws IOException, InterruptedException{
            int sum = 0; int count = 0; int avg ;
            //outKey.set(key);
            for (IntWritable sal:value){
                sum = sum + sal.get(); 
                count++;
            }
            avg = sum/count ;
            outValue.set(avg);
            context.write(key, outValue);
     }
 }

public static void main(String[] args) throws IOException, 
    ClassNotFoundException, InterruptedException{
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if(otherArgs.length != 2){
        System.err.println("Number of argument passed is not 2");
        System.exit(1);
    }
    Job job = new Job(conf, "My regular MapReduce job");

    job.setJarByClass(PartitionExample.class);
    job.setMapperClass(MapClass.class);
//  job.setCombinerClass(ReduceClass.class);
    job.setReducerClass(ReduceClass.class);

    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(IntWritable.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));

    System.exit(job.waitForCompletion(true) ? 0 : 1);

}
}

最佳答案

我在代码中发现了错误。我可以说这是一个非常愚蠢的错误:( 它在 ovirridden reduce 函数名称中。我将其从“减少”更改为“减少”。

关于java - 通过 MapReduce 代码平均工资，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47192944/