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An Auto Scaling group uses a cooldown period of 150 seconds. A scale-out event occurs at 2:00:00 PM, and a scale-in event is triggered at 2:01:30 PM. What will happen?

hard📝 service behavior Q9 of 15
AWS - Auto Scaling
An Auto Scaling group uses a cooldown period of 150 seconds. A scale-out event occurs at 2:00:00 PM, and a scale-in event is triggered at 2:01:30 PM. What will happen?
AScale-in event is delayed until cooldown ends
BScale-in event proceeds immediately
CCooldown resets and both events happen simultaneously
DScale-out event is canceled
Step-by-Step Solution
Solution:
  1. Step 1: Calculate time difference

    Scale-in event at 2:01:30 PM is 90 seconds after scale-out at 2:00:00 PM.
  2. Step 2: Compare with cooldown period

    Cooldown is 150 seconds, so scale-in event is within cooldown period.
  3. Step 3: Understand cooldown effect on scale-in

    Scale-in events respect cooldown and will be delayed until cooldown ends.
  4. Final Answer:

    Scale-in event is delayed until cooldown ends -> Option A
  5. Quick Check:

    Scale-in blocked during cooldown = true [OK]
Quick Trick: Scale-in waits for cooldown; scale-out can ignore it [OK]
Common Mistakes:
MISTAKES
  • Assuming scale-in proceeds immediately
  • Thinking cooldown resets on new events
  • Believing scale-out cancels scale-in

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