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An Auto Scaling group has a cooldown period of 200 seconds. A scale-out event occurs at 10:00:00 AM. Another scale-out event is triggered at 10:02:30 AM. What happens?

medium📝 service behavior Q4 of 15
AWS - Auto Scaling
An Auto Scaling group has a cooldown period of 200 seconds. A scale-out event occurs at 10:00:00 AM. Another scale-out event is triggered at 10:02:30 AM. What happens?
AThe second scale-out event is ignored due to cooldown
BThe second scale-out event proceeds immediately
CThe cooldown period resets and delays the second event
DBoth scale-out events happen simultaneously
Step-by-Step Solution
Solution:
  1. Step 1: Calculate time difference between events

    The second event is at 10:02:30 AM, which is 150 seconds after 10:00:00 AM.
  2. Step 2: Compare with cooldown period

    Cooldown is 200 seconds, but only 150 seconds passed, so cooldown is still active.
  3. Step 3: Understand AWS default cooldown behavior

    For scale-out events, AWS Auto Scaling respects the cooldown period and blocks new scale-out actions until cooldown ends.
  4. Final Answer:

    The second scale-out event is ignored due to cooldown -> Option A
  5. Quick Check:

    Scale-out cooldown respected = true [OK]
Quick Trick: Cooldown blocks scale-out events until cooldown ends [OK]
Common Mistakes:
MISTAKES
  • Assuming cooldown blocks all scaling events
  • Ignoring AWS scale-out cooldown behavior
  • Confusing cooldown reset behavior

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