使用mapreduce java

Question

我有一个输入文件，第一列表示专利，第二列表示专利，如下所示：

1 1.232
1 1.45
1 1.153
1 1.100
2 2.179
2 2.206
2 2.59
3 3.233
3 3.171
3 3.197
3 3.40
3 3.201

我必须计算与每个专利相关的子专利数量，我尝试将mapper输入作为字符串，但是它抛出错误。我的代码如下：

public static class Map extends Mapper<LongWritable,Text,Text,IntWritable>{
    private final static IntWritable one = new IntWritable(1);
        //private IntWritable word = new IntWritable();
 public void map(LongWritable key, Text value,Context context)throws IOException,InterruptedException {
        String line = value.toString();
        StringTokenizer tokenizer = new StringTokenizer(line);

        while (tokenizer.hasMoreTokens()) {
            value.set(tokenizer.nextToken());
            context.write(value, one);
              }
 }

}
public static class Reduce extends Reducer<Text,IntWritable,IntWritable,IntWritable>{

    public void reduce(Text key, Iterable<IntWritable> values,Context context) 
      throws IOException,InterruptedException {

        int sum=0;
    // TODO Auto-generated method stub

        for(IntWritable x: values)
        {
            sum+=x.get();//sum = sum + x.get();
        }
        context.write(key, new IntWritable(sum));  
    }

}

请提供帮助。我的输出应如下所示：

Patent     Number of Associated Sub-patents
1           4
2           3
3           5

谢谢， Sahitya