System Design - Uber

Question 1

Deep Dives

Answer 1

1. How to handle huge number of writes?
   Answer: Redis Geospatial data-store
   Geohashing - encode lat/long together. indexed using sorted set
   GEOADD, GEORADIUS, GEORADIUSBYMEMBER
   Use Redis Cluster or Sentinel. Choose Cluster
2. Handle to many location updates.
   Answer: just update every 5 seconds
3. Prevent multiple driver requests.
   ANswer: distributed Redis lock on driver ID
4. Handle Peak load. How make sure riders can request stuff
   Answer: Kafka queue