我有一个mapreduce作业，它输出一个intwritable作为键，点（我创建的实现可写的对象）作为map函数的值。然后在reduce函数中，我使用for each循环遍历点的iterable来创建一个列表：

@Override
public void reduce(IntWritable key, Iterable<Point> points, Context context) throws IOException, InterruptedException {

    List<Point> pointList = new ArrayList<>();
    for (Point point : points) {
        pointList.add(point);
    }
    context.write(key, pointList);
}

问题是这个列表的大小是正确的，但是每个点都是完全相同的。我的point类中的字段不是静态的，我已经在循环中单独打印了每个点，以确保这些点是唯一的（它们是唯一的）。此外，我还创建了一个单独的类，它只创建几个点并将它们添加到列表中，这似乎是可行的，这意味着mapreduce做了一些我不知道的事情。
任何帮助解决这一点将不胜感激。
更新：Map器类的代码：

private final static IntWritable one = new IntWritable(1);
private Text word = new Text();
private IntWritable firstChar = new IntWritable();
private Point point = new Point();

@Override
public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
    String line = value.toString();
    StringTokenizer tokenizer = new StringTokenizer(line, " ");

    while(tokenizer.hasMoreTokens()) {
        String atts = tokenizer.nextToken();
        String cut = atts.substring(1, atts.length() - 1);
        String[] nums = cut.split(",");

        point.set(Double.parseDouble(nums[0]), Double.parseDouble(nums[1]), Double.parseDouble(nums[2]), Double.parseDouble(nums[3]));
        context.write(one, point);
    }
}

点类：

public class Point implements Writable {

public Double att1;
public Double att2;
public Double att3;
public Double att4;

public Point() {

}

public void set(Double att1, Double att2, Double att3, Double att4) {
    this.att1 = att1;
    this.att2 = att2;
    this.att3 = att3;
    this.att4 = att4;
}

@Override
public void write(DataOutput dataOutput) throws IOException {
    dataOutput.writeDouble(att1);
    dataOutput.writeDouble(att2);
    dataOutput.writeDouble(att3);
    dataOutput.writeDouble(att4);
}

@Override
public void readFields(DataInput dataInput) throws IOException {
    this.att1 = dataInput.readDouble();
    this.att2 = dataInput.readDouble();
    this.att3 = dataInput.readDouble();
    this.att4 = dataInput.readDouble();
}

@Override
public String toString() {
    String output = "{" + att1 + ", " + att2 + ", " + att3 + ", " + att4 + "}";
    return output;
}