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To handle high-frequency location updates (e.g., millions of users), use a connection between the client and a dedicated Location Service .

Designing services like Yelp or Facebook Nearby Friends requires efficient spatial indexing to query geographical coordinates instantly. system design interview alex xu volume 2 pdf github upd

Pick 2 or 3 critical components to investigate deeply. Discuss data schemas, concurrency control, and failure modes. To handle high-frequency location updates (e