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mid

What is a Dead Letter Queue and why is it needed?

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midmessaging

A queue for messages that failed to be processed after N attempts.

A DLQ is a separate queue where failed messages end up. Reasons: poison message (invalid format), timeout, exception in consumer. Retry policy: 3 attempts with backoff -> DLQ. Monitoring the DLQ is critical — alert when messages appear. Reprocessing: after a fix, messages can be resent from the DLQ.

Когда да

Any production message queue — it's a safety net

Когда нет

There's no case where it's not needed — a DLQ is mandatory

Совет на собеседовании

A DLQ is a sign of a production-ready system. Without one — data loss

Альт:Retry topic (Kafka)Error queue

Свайп вправо — знаю, влево — не знаю

ArchCase

ArchCase

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A queue for messages that failed to be processed after N attempts.