Existing Work ● Disadvantage1: target on only one goal, even conflict goal o e.g., minimizing total distance while trying to serve all requests [ICDE 13, VLDB14 o In another word, not all requests need to be served o That is to say, optimal result is 0, i.e., we do not serve any requestsExisting Work ⚫ Disadvantage 1: ⚫ target on only one goal, even conflict goal o e.g., minimizing total distance while trying to serve all requests [ICDE’13, VLDB’14] o In another word, not all requests need to be served o That is to say, optimal result is 0, i.e., we do not serve any requests 5