for (int j = 0; j < bucketSize; j++) {
And it started as a Java project and then moved to be Python and not thread-based, but basically coroutine-based before we had coroutines in Python.，更多细节参见旺商聊官方下载
Synchronous fast paths matter，这一点在同城约会中也有详细论述
Credit: Otherland / Amazon
Standard Digital