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Instances take 3 minutes to become ready and traffic doubles in 2 minutes. What follows for a reactive scaling policy?

  • A.no scaling is needed for a rise of this speed
  • B.the cooldown period prevents any problem here
  • C.capacity arrives after the peak has passed
  • D.capacity arrives in good time to meet the peak

Answer: C

Reacting after the rise begins cannot beat a warm-up longer than the rise itself. Pre-warming, predictive scaling or a larger baseline are the available answers. None of them is free, so the choice depends on how costly a brief overload is.

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