咨询RateLimiterController线程安全争议的问题

long currentTime = TimeUtil.currentTimeMillis(); // Calculate the interval between every two requests. long costTime = Math.round(1.0 * (acquireCount) / count * 1000);

// Expected pass time of this request.
long expectedTime = costTime + latestPassedTime.get();

if (expectedTime <= currentTime) {
    // Contention may exist here, but it's okay.
    latestPassedTime.set(currentTime);
    return true;
} 

    // Contention may exist here, but it's okay.
    latestPassedTime.set(currentTime);

咨询下：这里写着有争议， 但是确实出现了线程安全的问题，为啥是okay的？

原提问者GitHub用户fg546300040