Message Queue

A practical example

Example: a campaign tool enqueues 50,000 personalized emails during a launch; the sending service processes the queue at a rate that respects the email provider's limits instead of failing under load.

What to evaluate before investing

• Ask whether delivery is at-least-once (duplicates possible) and how consumers deduplicate.
• Check whether strict ordering is guaranteed per queue, per key, or not at all.
• Review observability: can you see queue depth, message age, and dead-letter contents without extra tooling?

Limitations and tradeoffs

Queues shift complexity rather than remove it: you inherit responsibility for poison messages, retry storms, and backlog monitoring, so budget operational attention accordingly.