01 · Assumptions
State the scale before drawing boxes
Four explicit assumptions make every downstream number defensible.
02 · Derived load
GPS dominates the event mix
The total peak lands near 600K–700K events per second.
~100×
GPS event rate versus average trip-lifecycle rate.
03 · Storage
Translate velocity into daily weight
Raw location history is the capacity problem; trip facts are the correctness problem.
04 · Whiteboard
Keep only four formulas
Each formula includes the worked interview number. Click to copy.
05 · Decision
Treat location streaming as first-class
GPS volume is 100× trip events, so it must be separately partitioned and separately tiered.
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