Dear all, I have a lot data with the same key. Ex, Contact{ userId{ "tel":..., "phone": ... } Info{ userId{ "birthday": ..., "sex":..., "nationality": ... } } Address{ userId{ "street": ..., "address": ..., "city": ..., "province": ... } } We have 2 way to design Data data model: 1- Use 3 Column Family 2- Use 1 super Column Family: Which one is better? Thank a lot for support. -- Best regards, JKnight