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Integration / RabbitMQ Interview Questions

Why do we use dead-letter exchanges in RabbitMQ?

A dead-letter exchange (DLX) is where RabbitMQ reroutes messages that could not be processed normally, instead of silently discarding them.

A message becomes "dead-lettered" when any of the following happen:

  • it is rejected or nacked with requeue=false,
  • its TTL expires before it is consumed,
  • the queue has hit its max-length and the message is dropped from the head.

Configuring x-dead-letter-exchange on a queue means these messages land in a dedicated queue instead of vanishing, which enables retry logic, alerting, and auditing of failures rather than silent message loss.

Which of these triggers a message being dead-lettered?
What argument configures a queue's dead-letter exchange?

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