我在hadoop中有以下代码，当它运行时，它会将映射器的输出作为减速器的输出。减速器基本上什么都不做。2个输入文件的形式如下：

文件A：Jan-1#starwar，17115（每行都像这样。）VALUE是数字17115。

文件B：#starwar，2017/1/1 5696（每行都像这样。）VALUE是数字5696。

Mapper类处理这些文件并输出（仅粗体字母）：

JAN#STARWARS 17115/A其中关键：JAN#STARWARS

JAN#STARWARS 5696/B其中关键：JAN#STARWARS

减速机应该执行以下操作：

所有相同的键都指向一个还原器，如果我错了请纠正我，我是hadoop的新手，每个还原器将值拆分为2部分：键和值

关键：A，值17115

钥匙：B，值5696

目前，它应该只添加所有值，而不关心它是来自A还是B，并写入（仅粗体）：

1月#星战22.811（22.811=17115 5696）

那么为什么它在没有减速器做它应该做的事情的情况下写入映射器输出呢？我没有将减速器的num设置为零。

import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.fs.FileSystem;
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.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.MultipleInputs;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.Partitioner;

public class WordCount {

  public static class TokenizerMapper
  extends Mapper<Object, Text, Text, Text>{

  //private final static IntWritable result = new IntWritable();
  private Text word = new Text();


public void map(Object key, Text value, Context context
                ) throws IOException, InterruptedException {
  StringTokenizer itr = new StringTokenizer(value.toString(),"\n");
  while (itr.hasMoreTokens()) {

    String nextWord = itr.nextToken().toUpperCase();

    //System.out.println("'"+nextWord+"'");
    if(isFromPlatformB(nextWord)){
    //Procedure for words of Platform B.
        String[] split1 = nextWord.split("(,)|(/)|(\\s)");
        String seriesTitle = split1[0];
        String numOfMonth = split1[2];
        String numOfDay = split1[3];
        String number = split1[4];//VALUE

        int monthInt = Integer.parseInt(numOfMonth);
        String monthString;

        switch (monthInt) {
            case 1:  monthString = "JAN";
                 break;
            case 2:  monthString = "FEB";
                 break;
            case 3:  monthString = "MAR";
                 break;
            case 4:  monthString = "APR";
                 break;
            case 5:  monthString = "MAY";
                 break;
            case 6:  monthString = "JUN";
                 break;
            case 7:  monthString = "JUL";
                 break;
            case 8:  monthString = "AUG";
                 break;
            case 9:  monthString = "SEP";
                 break;
            case 10: monthString = "OCT";
                 break;
            case 11: monthString = "NOV";
                 break;
            case 12: monthString = "DEC";
                 break;
            default: monthString = "ERROR";
                 break;
            }

         //result.set(numberInt);
         word.set(monthString + " " + seriesTitle);
         System.out.println("key: "+monthString + " " + seriesTitle + ",  value: "+number+"/B");
         context.write(word, new Text(number + "/B"));
         //FORMAT : <KEY,VALUE/B>
    }
    else{
         //Procedure for words of Platform A.
         String[] split5 = nextWord.split("(-)|( )|(,)");
         String month = split5[0];
         String seriesTitle = split5[2];
         String value2 = split5[3];//OUTVALUE
         String finalWord = month + " " + seriesTitle;//OUTKEY   KEY: <APR #WESTWORLD>

         word.set(finalWord);
         //result.set(valueInt);
         System.out.println("key: "+finalWord + ",  value: "+value2+"/A");
         context.write(word, new Text(value2 + "/A"));
         //FORMAT : <KEY,VALUE/A>
    } 
  }
}

 /*
 *This method takes the next token and returns true if the token is taken from platform B file,
 *Or it returns false if the token comes from platform A file.
 *
 */
 public boolean isFromPlatformB(String nextToken){
   // B platform has the form of : "#WestWorld ,2017/1/2){
   if(nextToken.charAt(0) == '#'){  
      return true;
   }
   return false;
}
}

  public static class IntSumReducer
   extends Reducer<Text,IntWritable,Text,Text> {
//private IntWritable result = new IntWritable();

public void reduce(Text key, Iterable<Text> values,
                   Context context
                   ) throws IOException, InterruptedException {
  int sum = 0;
  for (Text val : values) {
      String valToString = val.toString();

      String[] split = valToString.split("/");
      //String keyOfValue;
      String valueOfValue;
      int intValueOfValue = 0;

      // FORMAT : <KEY,VALUE/platform>  [<KEY,VALUE>,VALUE = <key,value>]
      //                 [0]      [1]

      if(split.length>1){
             //keyOfValue = split[1];
          valueOfValue = split[0];
          //System.out.println(key);
          //System.out.println(valueOfValue);
          //System.out.println(keyOfValue);
          intValueOfValue = Integer.parseInt(valueOfValue);
          /*if(keyOfValue.equals("A")){//If value is from platform A
              counterForPlatformA += intValueOfValue;
              System.out.println("KEY = 'A' " + "VALUE :"     +intValueOfValue);
              System.out.println("counter A: "+ counterForPlatformA +"||     counter B: "+ counterForPlatformB + "||----||");
          }
          else if(keyOfValue.equals("B")){//If value is from platform B
                 counterForPlatformB += intValueOfValue;
                 System.out.println("KEY = 'B' " + "VALUE :" +intValueOfValue);
                 System.out.println("counter A: "+ counterForPlatformA +"|| counter B: "+ counterForPlatformB + "||----||");
              }
              else{
                    //ERROR
                    System.out.println("Not equal to A or B");
                  }*/

      }
      sum += intValueOfValue;
  }
  context.write(key, new Text(sum));
  }
  }

public static void main(String[] args) throws Exception{

 if (args.length != 3 ){
    System.err.println ("Usage :<inputlocation1> <inputlocation2>   <outputlocation> >");
    System.exit(0);
}
Configuration conf = new Configuration();
String[] files=new GenericOptionsParser(conf,args).getRemainingArgs();
Path input1=new Path(files[0]);
Path input2=new Path(files[1]);
Path output=new Path(files[2]);
//If OUTPUT already exists -> Delete it
FileSystem fs = FileSystem.get(conf);
if(fs.exists(output)){
    fs.delete(output, true);
} 

Job job = Job.getInstance(conf, "word count");
job.setJarByClass(WordCount.class);
job.setMapperClass(TokenizerMapper.class);
job.setCombinerClass(IntSumReducer.class);
job.setReducerClass(IntSumReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
MultipleInputs.addInputPath(job, input1, TextInputFormat.class);
MultipleInputs.addInputPath(job, input2, TextInputFormat.class);
FileOutputFormat.setOutputPath(job, output);
System.exit(job.waitForCompletion(true) ? 0 : 1);

}
}