Hi all, We just drafted a formal version <https://docs.google.com/document/d/1PUonl9i_fVlRhUmqEmWBQJ8zesX7mlvnu3ubemT11rk/edit#heading=h.kkuoyw5u0ywe> of the design based on the pre-design <https://docs.google.com/document/d/1Q-d98Os_aJahUynznPrWvXwWQeN0aFDRhZj3hXt_JOM/edit#heading=h.kkuoyw5u0ywe> discussion. Any feedback is welcome! Feel free to make comment on the document directly. Thanks.
-- Xinli Shang
