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Re:How We Built Uber’s Highest Query per Second Service Usin... by agentargo on Tuesday March 01, 2016 @10:12PM (#11207880)
This one uses a "Spatial" interface and has worked well enough with a little bit of tuning.

https://github.com/dhconnelly/rtreego

Re:How We Built Uber’s Highest Query per Second Service Usin... by azth on Wednesday March 02, 2016 @03:32AM (#11208752)
Using an interface is not good for performance.