RabbitMQ vs Kafka
Not a benchmark. A comparison of the questions each one makes you answer: about ordering, replay, consumers and who owns the offset.
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Idempotent consumers, without the ceremony
What actually happens when the same message arrives twice, and the smallest set of changes that makes a consumer safe to retry.
Rebuilding the billing flow as events
Why the second version of an event-driven design is usually the simpler one, and the retry question that decided the whole shape.
Designing a URL shortener
The classic interview system, built small and measured: where the reads go, what the cache is for, and the one decision that made everything else easy.
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Have a system worth arguing about?
If this note raised a question, or you would have designed it differently, I would like to hear it.
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