忽略hadoop减速器

Question

Iam初学者到hadoop。我决定创建一个情感分析程序。我有一个映射器类。映射器的输出是LongWritable和Text格式。输入到减速器。因此，我有一个减速器类

public class sentreducer extends Reducer<LongWritable,Text,LongWritable,Text>{ 
      @Override 
      public void reduce(LongWritable key,Iterable<Text>value,Context context){ 
      } 

编译器显示错误，说该方法不能被重写。为什么？

Answer 1

我认为你必须在减少方法抛出IOException的一个和InterruptedException的即

public class sentreducer extends Reducer<LongWritable,Text,LongWritable,Text>{ 
    @Override 
    public void reduce(LongWritable key,Iterable<Text> value,Context context) throws IOException, InterruptedException { 
    } 
} 

Answer 2

方法签名应该是

public void reduce(LongWritable key, Iterator<Text> values, 
     OutputCollector<LongWritable, Text> collector, Reporter reporter) throws IOException