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You are designing an Azure application. The application includes two web roles and three instances of a worker role. The web roles send requests to the worker role by using one or more Azure Queues.
You need to recommend a queue design for sending requests to the worker role.
What should you recommend?
A. Create a queue for each combination of web roles and worker role instances. Send requests to all worker role instances based on the sending web role.
B. Create a single queue. Send all requests on the single queue.
C. Create a queue for each worker role instance. Send requests on each worker queue by using a round robin rotation.
D. Create a queue for each web role. Send requests on all queues at the same time.
Correct Answer: B
Explanation/Reference:
To communicate with the worker role, a web role instance places messages on to a queue. A worker role instance polls the queue for new messages, retrieves them, and processes them. There are a couple of important things to know about the way the queue service works in Azure. First, you reference a queue by name, and multiple role instances can share a single queue. Second, there is no concept of a typed message; you construct a message from either a string or a byte array. An individual message can be no more than 64 kilobytes (KB) in size.
Reference: https://msdn.microsoft.com/en-gb/library/ff803365.aspx
Reference: http://azure.microsoft.com/en-gb/documentation/articles/cloud-services-dotnet-multi-tier-app-using-service-bus-queues/
