如何在Java后端功能开发中处理大数据量的计算？

public class WordCount {

  public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
    private final static IntWritable one = new IntWritable(1);
    private Text word = new Text();

    public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
      String line = value.toString();
      StringTokenizer tokenizer = new StringTokenizer(line);
      while (tokenizer.hasMoreTokens()) {
        word.set(tokenizer.nextToken());
        context.write(word, one);
      }
    }
  }

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

    public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
      int sum = 0;
      for (IntWritable val : values) {
        sum += val.get();
      }
      result.set(sum);
      context.write(key, result);
    }
  }

  public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    Job job = Job.getInstance(conf, "word count");
    job.setJarByClass(WordCount.class);
    job.setMapperClass(Map.class);
    job.setCombinerClass(Reduce.class);
    job.setReducerClass(Reduce.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);
    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
  }
}

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class BigDataProcessing {

  public static void main(String[] args) {
    int numberOfThreads = 10; // 设置线程数量
    ExecutorService executor = Executors.newFixedThreadPool(numberOfThreads);

    // 待处理的数据集
    List<Integer> data = new ArrayList<>();
    for (int i = 0; i < 1000000; i++) {
      data.add(i);
    }

    // 创建任务，并提交给线程池
    for (int i = 0; i < numberOfThreads; i++) {
      int startIndex = i * (data.size() / numberOfThreads);
      int endIndex = (i + 1) * (data.size() / numberOfThreads);
      Runnable task = new DataProcessingTask(data.subList(startIndex, endIndex));
      executor.submit(task);
    }

    executor.shutdown();
  }

  public static class DataProcessingTask implements Runnable {
    private List<Integer> dataChunk;

    public DataProcessingTask(List<Integer> dataChunk) {
      this.dataChunk = dataChunk;
    }

    public void run() {
      // 处理数据的逻辑
      for (Integer data : dataChunk) {
        // 进行具体的计算操作
        // ...
      }
    }
  }
}