减速机中的Arraylist

Question

以下是我的reducer代码。我应该做的是从mapper发送arraylist到reducer和reducer，想要打印从mapper传递的值，但问题是在reducer中它没有做任何事情。它只涉及减速机，打印机和减速机＆＃34;什么都不做请帮助找出错误。

public class firstreducer extends Reducer<LongWritable, IntArrayWritable, LongWritable, IntArrayWritable>
{

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

        System.out.println("reducer");
        int[] sum = new int[2];

        for(IntArrayWritable val: values) {
            IntWritable[] temp = new IntWritable[2];
            temp = (val.get());

            for(int i = 0; i < 2; i++) {
                sum[i] = Integer.parseInt(temp[i].toString());
                System.out.println(sum[i]);
            }
        }