Scenarios & trade-offsMediumSDE-2

Users complain they sometimes get the same 'Your order is out for delivery' push notification two or three times. The team says 'Kafka should be exactly-once'. What is causing it and how do you fix it?

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CREDDream11SwiggyZomato

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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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