java如何多线程批量更新10万级的数据

/**
 * 拆分集合
 *
 * @param <T> 泛型对象
 * @param resList 需要拆分的集合
 * @param subListLength 每个子集合的元素个数
 * @return 返回拆分后的各个集合组成的列表
 **/
public static <T> List<List<T>> splitList(List<T> resList, int subListLength) {
    if (CollectionUtils.isEmpty(resList) || subListLength <= 0) {
        return new ArrayList<>();
    }
    List<List<T>> ret = new ArrayList<>();
    int size = resList.size();
    if (size <= subListLength) {
        // 数据量不足 subListLength 指定的大小
        ret.add(resList);
    } else {
        int pre = size / subListLength;
        int last = size % subListLength;
        // 前面pre个集合，每个大小都是 subListLength 个元素
        for (int i = 0; i < pre; i++) {
            List<T> itemList = new ArrayList<>(subListLength);
            for (int j = 0; j < subListLength; j++) {
                itemList.add(resList.get(i * subListLength + j));
            }
            ret.add(itemList);
        }

        // last的进行处理
        if (last > 0) {
            List<T> itemList = new ArrayList<>(last);
            for (int i = 0; i < last; i++) {
                itemList.add(resList.get(pre * subListLength + i));
            }
            ret.add(itemList);
        }
    }
    return ret;
}

 public static void doThreadBusiness(List<String> totalList) {
        Long startTime = System.currentTimeMillis();
        System.out.println("本次更新任务开始");
        System.out.println("本机CPU核心数："+Runtime.getRuntime().availableProcessors());
        List<String> updateList = new ArrayList();
        // 初始化线程池, 参数一定要一定要一定要调好！！！！
        ThreadPoolExecutor threadPool = new ThreadPoolExecutor(10, 50,
                4, TimeUnit.SECONDS, new ArrayBlockingQueue(10), new ThreadPoolExecutor.DiscardPolicy());
        // 大集合拆分成N个小集合，然后用多线程去处理数据，确保不会因为数据量过大导致执行过慢
        List<List<String>> splitNList = SplitListUtils.splitList(totalList, 5000);
        // 记录单个任务的执行次数
        CountDownLatch countDownLatch = new CountDownLatch(splitNList.size());
        // 对拆分的集合进行批量处理, 先拆分的集合, 再多线程执行
        for (List<String> singleList : splitNList) {
            // 线程池执行
            threadPool.execute(new Thread(new Runnable(){
                @Override
                public void run() {
                    //模拟执行时间
                    System.out.println("当前线程："+Thread.currentThread().getName());
                    List<String> batchUpdateVipList = new ArrayList<>();
                    for (String str : singleList) {
                        //组装要执行的批量更新数据
                        batchUpdateVipList.add(str);
                    }
                    // 这里模拟执行数据库批量更新操作
                    System.out.println("本次批量更新数据量："+ batchUpdateVipList.size());
                    // 任务个数 - 1, 直至为0时唤醒await()
                    countDownLatch.countDown();
                }
            }));
        }
        try {
            // 让当前线程处于阻塞状态，直到锁存器计数为零
            countDownLatch.await();
        } catch (Exception e) {
            System.out.println("系统出现异常");
        }
        Long endTime = System.currentTimeMillis();
        Long useTime = endTime - startTime;
        System.out.println("本次更新任务结束,共计用时"+useTime+"毫秒");
    }

CountDownLatch countDownLatch = new CountDownLatch(splitNList.size());

// 任务个数 - 1, 直至为0时唤醒await()
countDownLatch.countDown();

 countDownLatch.await();

ThreadPoolExecutor threadPool = new ThreadPoolExecutor(10, 
50,
4, 
TimeUnit.SECONDS, 
new ArrayBlockingQueue(10), 
new ThreadPoolExecutor.DiscardPolicy()
);