在使用 Fork/Join 框架进行并发编程时需要注意哪些问题？请给出建议。

protected void compute() {
    if (taskSize <= threshold) {
        // 直接计算任务
    } else {
        // 拆分任务
        ForkJoinTask leftTask = new SubTask(start, mid);
        ForkJoinTask rightTask = new SubTask(mid + 1, end);
        invokeAll(leftTask, rightTask);
    }
}

// 不推荐直接在主线程调用 join
ForkJoinTask result = task.fork();
result.join();

// 推荐使用 invokeAll
invokeAll(task1, task2);

@Override
protected Integer compute() {
    try {
        // 执行任务
    } catch (Exception e) {
        System.err.println("Task failed: " + e.getMessage());
        return 0; // 返回默认值
    }
}

ForkJoinPool.managedBlock(new ForkJoinPool.ManagedBlocker() {
    @Override
    public boolean block() throws InterruptedException {
        // 执行阻塞操作
        return true;
    }

    @Override
    public boolean isReleasable() {
        // 判断是否可以释放
        return false;
    }
});

ForkJoinPool pool = new ForkJoinPool(8); // 设置并行度为 8
pool.submit(task);
pool.shutdown();

import java.util.concurrent.RecursiveTask;
import java.util.concurrent.ForkJoinPool;

public class ForkJoinExample {
    private static class SumTask extends RecursiveTask<Long> {
        private static final int THRESHOLD = 1000;
        private final int[] array;
        private final int start, end;

        public SumTask(int[] array, int start, int end) {
            this.array = array;
            this.start = start;
            this.end = end;
        }

        @Override
        protected Long compute() {
            if (end - start <= THRESHOLD) {
                // 任务足够小，直接计算
                long sum = 0;
                for (int i = start; i < end; i++) {
                    sum += array[i];
                }
                return sum;
            } else {
                // 任务过大，拆分为两个子任务
                int mid = (start + end) / 2;
                SumTask leftTask = new SumTask(array, start, mid);
                SumTask rightTask = new SumTask(array, mid, end);

                invokeAll(leftTask, rightTask);
                return leftTask.join() + rightTask.join();
            }
        }
    }

    public static void main(String[] args) {
        int[] array = new int[1000000];
        for (int i = 0; i < array.length; i++) {
            array[i] = i + 1;
        }

        ForkJoinPool pool = new ForkJoinPool();
        SumTask task = new SumTask(array, 0, array.length);

        long result = pool.invoke(task);
        System.out.println("Sum: " + result);

        pool.shutdown();
    }
}