How We Built a Backend System for Uber-like Map with Animated Cars Using Go.
Andrew Minkin

Good article with detailed info.I have few questions.

a) Why did you have to use LRU cache for last known locations of a driver ? Isn’t a simple list for each driver enough ? Is the LRU cache a list of locations for each driver ?

b) I understand the reason for using R Tree.As you are already using redis , did you consider using redis geo module which has the features that you are looking for such as nearest drivers,last known locations as a list in redis etc.

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