Millions of IoT readings per second must be ingested, read by several independent consumers, and replayed from earlier points in time. Which service fits?
- A Azure Event Hubs (correct answer)
- B Azure Service Bus queue
- C Azure Event Grid
- D Azure Storage queue
Shortcut: Streaming + replay + many independent readers = Event Hubs (consumer groups). Service Bus is for transactional messaging, Event Grid for discrete event notifications, and Storage queues for simple work queues.
Event Hubs is a partitioned log built for high-throughput streaming: each consumer group reads independently and can rewind to earlier offsets within the retention period. Service Bus is for transactional messaging, Event Grid for discrete event notifications, and Storage queues for simple work queues.