An "order placed" event must reach the email service, the analytics service and the warehouse service. Which messaging model fits?

Options

• ✗ A work queue: each message goes to exactly one consumer
• ✓ Pub/sub: each subscribing service gets its own copy Correct
• ✗ A single shared database table that every service polls
• ✗ Direct HTTP calls from the order service to all three

Why

A work queue spreads messages among competing workers of one service. Pub/sub delivers each event to every subscriber, so new services can be added without changing the publisher.

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