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Scenarios & trade-offsMediumSDE-2
Your checkout service calls a coupon service. The coupon service starts taking 10 seconds per call instead of 50 ms. Within minutes, checkout is down too, and so is the cart. Why did one slow service take down the others, and how do you design against it?
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AmazonMakeMyTripSwiggyUber
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Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.
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