Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You are designing an event-driven ingestion component for an Azure-based payment platform. Up to 50,000 events per minute arrive in bursts via an Azure Event Hubs Standard namespace, which can sit idle for hours. Each event must run a Python routine that enriches the payload and stores it in Azure Cosmos DB. The compute tier must bill only during execution, scale automatically, require no virtual-machine management, and provide native Event Hubs triggers and Cosmos DB output bindings. Which Azure compute option meets all requirements while minimizing cost when idle?
Azure Container Apps with a KEDA Event Hub scaler
Azure Functions on a Dedicated (App Service) plan
Azure Functions on the Consumption plan
An Azure App Service WebJob on the Basic pricing tier
Azure Functions on the Consumption plan satisfies every requirement. It offers built-in Event Hubs triggers and Cosmos DB output bindings, automatically adds instances to handle burst traffic, and scales to zero when no events are present, so you pay only for execution time plus minimal storage. A Dedicated (App Service) plan keeps at least one instance running and incurs fixed charges. Azure Container Apps with an Event Hub KEDA scaler can scale to zero but lack native trigger and output binding abstractions, requiring custom SDK code. An App Service WebJob on the Basic tier runs on a continuously billed App Service instance, so idle costs remain.
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Microsoft Azure Solutions Architect Expert AZ-305
Design infrastructure solutions
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