Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You are designing a compute platform for a containerized background worker that processes orders placed in an Azure Service Bus queue. The job runs a custom Docker image that includes proprietary machine-learning libraries larger than the 250-MB limit for Azure Functions code packages. During most weekdays the queue is empty, but from Friday night through Sunday morning it can exceed 50,000 messages and must be drained within four hours. The operations team wants the solution to scale automatically down to zero instances when idle and to require the least possible infrastructure management effort.
Which Azure compute service should you recommend?
Azure Kubernetes Service with the cluster autoscaler enabled
Azure Container Apps with KEDA-based autoscaling on the Service Bus queue
Azure Functions in a Premium plan running the container image
Azure Container Instances launched by an Azure Logic App each time messages arrive
Azure Container Apps natively runs container images without size limits, integrates with KEDA to scale on Azure Service Bus queue length, and can scale out rapidly (up to hundreds of replicas) or all the way to zero when the queue is empty, providing true serverless consumption pricing. Azure Container Instances lack event-driven autoscale and therefore would require additional orchestration logic. Azure Functions premium plan can run containers but keeps at least one instance warm, so it cannot scale to zero and incurs always-on costs. Azure Kubernetes Service offers full control and autoscaling, but cluster creation, node patching, and control-plane management contradict the requirement to minimize infrastructure management effort.
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What is KEDA, and how does it work with Azure Container Apps?
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Why is Azure Kubernetes Service (AKS) not an ideal choice for this scenario?
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How does Azure Container Apps handle proprietary machine-learning libraries in large container images?
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Microsoft Azure Solutions Architect Expert AZ-305
Design infrastructure solutions
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