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AZ-305 · Question 40 · Domain 4.1: Design a compute solution
You are designing a serverless architecture using Azure Functions.
The function will process images uploaded to Blob Storage. The processing logic takes approximately 8 minutes to execute per image. The workload is highly variable, ranging from 0 to 1,000 images per hour. You need to ensure the function scales automatically based on demand, but you also need to avoid 'cold starts' because the application requires immediate processing when an image is uploaded.
Which Azure Functions hosting plan should you recommend?
You are designing a serverless architecture using Azure Functions.
The function will process images uploaded to Blob Storage. The processing logic takes approximately 8 minutes to execute per image. The workload is highly variable, ranging from 0 to 1,000 images per hour. You need to ensure the function scales automatically based on demand, but you also need to avoid 'cold starts' because the application requires immediate processing when an image is uploaded.
Which Azure Functions hosting plan should you recommend?
Answer options:
A.
Premium plan
B.
Consumption plan
C.
Dedicated (App Service) plan
D.
Azure Container Instances
How to approach this question
Evaluate the constraints: >5 min execution time, no cold starts, automatic scaling. The Premium plan is the only one that meets all three.
Full Answer
A.Premium plan✓ Correct
The Azure Functions Premium plan provides features like VNet integration, no cold starts (via pre-warmed instances), and unbounded execution duration (guaranteed 60 minutes, compared to the Consumption plan's 10-minute hard limit). It scales automatically based on demand, making it perfect for variable workloads that require immediate execution and long processing times.
Common mistakes
Choosing the Consumption plan, forgetting that it suffers from cold starts and has a strict execution timeout limit.
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