What is a message queue?
A message queue holds work sent by one system for later processing by another.
Producers and consumers
A producer enqueues a message; a consumer processes and acknowledges it. Retries and dead-letter queues handle failures. Delivery guarantees vary by implementation.
Uses and limitations
It separates email or image jobs from user requests. Monitor backlog, latency and duplicate effects; unacknowledged work may run twice.
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