Exam AZ-204 topic 2 question 22 discussion

The answer is D. Use an App Service plan. Configure the Function App to use an Azure Blob Storage trigger. Consumption plan can cause a 10-min delay in processing new blobs if a function app has gone idle. To avoid this latency, you can switch to an App Service plan with Always On enabled. https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob-trigger?tabs=csharp

A or D, never B. With Consumption plan, you could have cold start, and the question say "must be processed as quickly as possible" so you need an App Service Plan. Between A and D ... All triggers are Input, so i don´t undertand the difference.

Input binding not input trigger, it doesn't exist

Response of copilot: To minimize both latency and cost for uploading media to Azure Blob Storage, the Premium Plan would be the best choice. Here's why: Latency: The Premium Plan eliminates cold starts by keeping instances warm, which means your function will respond faster when triggered. Cost: While the Premium Plan has a higher base cost compared to the Consumption Plan, it offers more predictable pricing and can be more cost-effective if your function runs continuously or frequently. The Consumption Plan is cost-effective for sporadic workloads but may suffer from cold starts, leading to higher latency. The Service Plan provides more control and can be kept "Always On," but it might be more expensive for infrequent use. So the answer is D

To process images as quickly as possible after they are uploaded to an Azure Blob container and minimize latency, you should: B. Use a Consumption plan. Configure the Function App to use an Azure Blob Storage trigger. This configuration ensures that your Function App is triggered immediately when a new image is uploaded to the Blob container, leveraging the serverless nature of the Consumption plan to scale automatically and handle the processing efficiently

B. Use a Consumption plan. Configure the Function App to use an Azure Blob Storage trigger. Here's why: Consumption Plan: This plan is optimized for event-driven tasks like image processing, and it automatically scales based on the number of incoming requests, ensuring that images are processed as quickly as possible. The Function App will scale to handle multiple images without pre-allocating resources. Azure Blob Storage Trigger: This trigger is designed to respond to new blobs (images) in a storage container. It will fire the function as soon as a new blob is uploaded, which minimizes latency and ensures images are processed immediately. Other options: App Service Plan: Not the best choice for minimizing latency and cost. It requires pre-allocated resources, which might lead to higher costs and unnecessary resource allocation, especially if your function is event-driven and sporadic. Timer Trigger: This would introduce delays, as the function would be triggered on a schedule, not immediately after a new image is uploaded.

B- Using a Consumption plan with an Azure Blob Storage trigger is the most effective way to ensure that images are processed as quickly as possible after they are uploaded. The Blob Storage trigger automatically invokes the Function App in response to blob uploads, minimizing latency and handling scaling automatically based on demand. While option D is technically correct, using an App Service plan may not be the most efficient choice for this scenario if your goal is to minimize latency and optimize costs. A Consumption plan is typically more suitable for event-driven scenarios like this, as it automatically scales and charges based on usage. An App Service plan might provide more predictable performance but could be more costly if the function is not in constant use. Therefore, option B remains the more optimal choice for processing images immediately upon upload.

Whenever you see Function App, then answer should contain the word "consumption plan"

After a short discussion with Copilot AI , it gave me this answer: (Answer) If performance and no latency are top priorities, go with Option D (App Service plan). If cost efficiency and event-driven scalability matter more, choose Option B (Consumption plan).

Copilot AI also says the answer is B

Got this answer from ChatGPT: I understand the concern for minimizing latency and processing images as quickly as possible. However, the Azure Functions Consumption plan is designed to scale automatically based on demand, providing a cost-effective and efficient solution for scenarios where latency is a critical factor. When you configure your Azure Function App with an Azure Blob Storage trigger in a Consumption plan, it enables the function to respond quickly to new blob uploads. The Consumption plan is optimized for event-driven workloads, making it suitable for scenarios where you need fast response times. Therefore, option B (Use a Consumption plan. Configure the Function App to use an Azure Blob Storage trigger) remains a suitable and efficient choice for your requirements.

Had this on my exam today.

What is the difference between "storage trigger" and "storage input trigger"? In the end, isn't the second one just a reinforcement to indicate that the moment a file is placed, precisely as input, in the hypothetical folder, then it is picked up and processed by the trigger. Thank you in advance for your answers

Answer is B. When using a Consumption plan, Azure automatically scales out instances of the function as needed to handle incoming requests, and you only pay for the actual number of executions of the function. This ensures that the function is always available to process images without any delays caused by having to scale up or down manually.

D is correct "For this scenario where images must be processed as quickly as possible and latency must be minimized, it is recommended to use the App Service plan instead of the Consumption plan. The App Service plan provides dedicated resources to the function app, which can help improve performance and minimize the risk of cold start delays. Additionally, the App Service plan allows you to scale out the function app to multiple instances, which can help handle high traffic loads and further improve performance. On the other hand, the Consumption plan is a serverless hosting option that scales automatically based on demand, but may result in cold start delays and limited resources during high traffic periods. Therefore, it is recommended to use the App Service plan for this scenario."

Use an App Service plan. Configure the Function App to use an Azure Blob Storage trigger. Consumption plan can cause a 10-min delay in processing new blobs if a function app has gone idle. To avoid this latency, you can switch to an App Service plan with Always On enabled. https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob-trigger?tabs=csharp

D. Use an App Service plan. Configure the Function App to use an Azure Blob Storage trigger.