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#reliability
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One slow consumer can stop every RabbitMQ publisher
A slow RabbitMQ consumer fills one queue until shared resource alarms block every publisher. Trace the pressure, the loss boundaries, and the safer designs.
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The event was delivered. The work was not.
Event fan-out can reach every subscriber while the business operation remains unfinished. See which consumers need completion state, retries, and an owner.
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The transaction stops at the network
A database commit and an HTTP call cannot share one rollback. See what outbox, idempotency, inbox, sagas, and two-phase commit can prove after a crash.
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Exactly once, where?
Kafka can store one record while your application charges twice. Follow acknowledgements, offsets, retries, and transactions to see what Kafka can prove.
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Redis keys need owners
Raw Redis locks and claims had no shared owner, expiry, or failure rule. A small registry made every coordination key reviewable and operable.
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Delayed delivery without unbounded queues
A fixed binary ladder turns arbitrary delivery delays into bounded RabbitMQ topology with message TTLs, dead-letter routing, and powers of two, without plugins.