Exam AZ-204 topic 6 question 14 discussion

Correct Ans is A & C https://docs.microsoft.com/en-us/azure/architecture/patterns/publisher-subscriber#issues-and-considerations

The article has been updated, the new text says "In Azure, consider using Service Bus, Event Hubs or Event Grid." So A, B and C should be all correct. https://docs.microsoft.com/en-us/azure/architecture/patterns/publisher-subscriber#issues-and-considerations

Service bus Requires Polling but you can do long polling. So the keyword is actually "Constant Polling" https://learn.microsoft.com/en-us/azure/service-bus-messaging/compare-messaging-services

A. Service Bus: Azure Service Bus supports a publish-subscribe model through its Topics and Subscriptions. It allows for messages to be published to a topic and then sent to all subscriptions to that topic, eliminating the need for constant polling. C. Event Grid: Azure Event Grid is a fully managed event routing service that uses a publish-subscribe model. It allows for event-based architecture and eliminates the need for constant polling by pushing the events to the subscribers.

Still no convinced why event hub is not a correct answer. Some say that the event hub consumer is polling? I read the following in the doc: Any entity that reads event data from an event hub is an event consumer. All Event Hubs consumers connect via the AMQP 1.0 session and events are delivered through the session as they become available. The client doesn't need to poll for data availability.

On exam 3-Nov-2023. Went with proposed answer - 932/1000.

This was on the exam (July 2023). Went with AC. Scored 917

A & C Correct

Got it in exam 20/10/2022

A and C as both service bus and event grid implement publish-subscribe and don't require polling.

A, B and C should be all correct. It is strongly recommended to use available messaging products and services that support a publish-subscribe model, rather than building your own. In Azure, consider using Service Bus, Event Hubs or Event Grid. Other technologies that can be used for pub/sub messaging include Redis, RabbitMQ, and Apache Kafka. https://docs.microsoft.com/en-us/azure/architecture/patterns/publisher-subscriber

Got it on 03/2022, I chose A. Service Bus & C. Event Grid

Correct answer is A and C Ref: https://docs.microsoft.com/en-us/azure/architecture/patterns/publisher-subscriber#issues-and-considerations. Wrong answer B (eliminate the need for constant polling)Ref: https://docs.microsoft.com/en-us/azure/connectors/connectors-create-api-azure-event-hubs#trigger-polling-behavior

It seems that the selected answers are correct: "Existing technologies. It is strongly recommended to use available messaging products and services that support a publish-subscribe model, rather than building your own. In Azure, consider using Service Bus, Event Hubs or Event Grid. Other technologies that can be used for pub/sub messaging include Redis, RabbitMQ, and Apache Kafka." https://docs.microsoft.com/en-us/azure/architecture/patterns/publisher-subscriber

Got this one 01/2022. Went with most voted (to avoid writing answers again)

Service bus Event Grid

A & C Triggers of Event hub are long-polling, so B is not correct. https://docs.microsoft.com/en-us/azure/connectors/connectors-create-api-azure-event-hubs#trigger-polling-behavior