Implement solutions that use Azure Service Bus

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You have an Azure Service Bus instance.

You need to provide first-in, first-out (FIFO) guarantee for message processing.

What should you configure?

• dead-letter queue
• message deferral
• message sessions
• scheduled delivery

Note

This item tests the candidate’s knowledge of setting up FIFO guarantees in Azure Service Bus, which is a common task when implementing solutions by using Azure Service Bus.

To provide FIFO guarantees in Service Bus, sessions must be configured. Message sessions enable exclusive, ordered handling of unbounded sequences of related messages. A dead-letter queue holds messages that cannot be delivered to any receiver. Message deferral makes it possible to defer retrieval of a message until a later time. Scheduled delivery allows submitting messages to a queue or topic for delayed processing. A dead-letter queue, message deferral, and scheduled delivery do not provide FIFO guarantees.

Explore Azure Service Bus - Training | Microsoft Learn
Azure Service Bus message sessions - Azure Service Bus | Microsoft Learn

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A logistics company requires a messaging system that can automatically handle messages that cannot be processed after several attempts, moving them to a separate storage for later analysis.

You need to choose a queue service that supports automatic handling of non-processable messages.

What should you use?

• Azure Event Grid with advanced filtering
• Azure Queue Storage with message expiration
• Azure Service Bus dead-letter queue
• Azure Storage queues with visibility timeout

Note

Azure Service Bus dead-letter queue is designed to hold messages that cannot be delivered to any receiver or are not processed successfully, which is suitable for the company's requirement. Azure Storage queues with visibility timeout only hide messages temporarily and do not move them to separate storage. Azure Event Grid with advanced filtering is for event routing, not for handling failed message processing. Azure Queue Storage with message expiration simply deletes expired messages rather than moving them for analysis.

Discover Azure message queues - Training | Microsoft Learn
Compare Azure Storage queues and Service Bus queues - Azure Service Bus | Microsoft Learn

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A financial services company is implementing a system to process transactions that are received as messages. The system must ensure that transactions are processed only once, and in the exact order they are received to maintain data integrity.

You need to design a messaging solution that guarantees first-in-first-out (FIFO) message delivery and processing.

Which two services should you use?

• Azure Event Grid with advanced filtering
• Azure Queue Storage with visibility timeout
• Azure Service Bus with duplicate detection
• Azure Service Bus with sessions enabled

Note

Azure Service Bus with sessions enabled allows for FIFO processing by using sessions to ensure that related messages are handled in the order they are received. Duplicate detection helps to ensure that the system does not process the same transaction more than once. Azure Queue Storage does not guarantee FIFO processing as it does not support sessions, and visibility timeout only hides the message temporarily from other consumers. Azure Event Grid is an event routing service and does not provide FIFO guarantees or message sessions.

Discover Azure message queues - Training | Microsoft Learn
Introduction to Azure Service Bus, an enterprise message broker - Azure Service Bus | Microsoft Learn