Looking upwaed Farther, som of us may be surpirse that Vietham, Korea and Japan have the similar rituals too. They apolgize the water Goddess and float away ill fortune It is assumed that the origin is Mahayana Buddhism which was expanded from Chaina.
On the other hand, Indians claim that they are the root of this ceremony derived from Brahmin. This festival is aimed to worship Naraya God who sleep in the milk ocean and he then will throw our sin away.