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Uber · Data Engineering
Lock freshness, correctness, and privacy expectations.
01 · Assumptions
Four explicit assumptions make every downstream number defensible.
02 · Derived load
The total peak lands near 600K–700K events per second.
GPS event rate versus average trip-lifecycle rate.
03 · Storage
Raw location history is the capacity problem; trip facts are the correctness problem.
04 · Whiteboard
Each formula includes the worked interview number. Click to copy.
05 · Decision
GPS volume is 100× trip events, so it must be separately partitioned and separately tiered.
