What's changed: Deepened AZ-204 Chapter 5 to Associate depth (tables, scenarios, FAQ, traps; localized figures)
5.2Messaging and Events
Understand choosing among Service Bus (enterprise messaging), Storage Queue (simple queue), Event Grid (reactive event delivery), and Event Hubs (high-volume streaming).
To loosely couple components, integrate via messages or events. Azure offers several services by use case.
5.2.1Choosing messages vs. events
- Service Bus: enterprise messaging (queues/topics); strong on ordering, transactions, dedup.
- Storage Queue: a simple, cheap queue for high volume; for basic async work.
- Event Grid: reactive delivery of discrete events (pub/sub); "something happened" to subscribers.
- Event Hubs: specialized for high-volume streaming/telemetry ingestion (high throughput).
Common on AZ-204: business messages needing ordering/transactions = Service Bus, react to discrete resource events = Event Grid, high-volume telemetry/stream ingest = Event Hubs, simple cheap queue = Storage Queue. Distinguish messages (commands) from events (notifications).
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