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AZ-204 Practice Question: Event Grid trigger to replace Blob Storage…
This AZ-204 practice question tests your understanding of event grid trigger to replace blob storage…. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: azure Functions. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Images are uploaded to a high-volume Blob Storage account. An Azure Function with a Blob Storage trigger processes each new image. The team has observed processing delays of up to 10 minutes on accounts with large numbers of containers and blobs. They need processing to start within seconds of upload. What should the developer change?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Switch to a Timer trigger that runs every 30 seconds and lists newly created blobs via the SDK
A 30-second timer still introduces up to 30 seconds of latency and requires the Function to query blob metadata on every timer fire — adding SDK calls and complexity. Event Grid push-based delivery is faster and simpler.
B
Distractor review
Use a Queue Storage trigger and write blob metadata to the queue from the upload client
This approach requires modifying the upload client to write queue messages, adding a dependency between the uploader and the processing pipeline. Event Grid decouples the producer (blob upload) from the consumer (Function) without requiring changes to the upload side.
C
Distractor review
Move the Function to a Premium plan, which uses a dedicated worker and eliminates Blob trigger polling delays
The Premium plan eliminates cold starts and provides VNET integration, but it does not change the fundamental polling mechanism of the Blob Storage trigger. The polling delay on large accounts affects all hosting plans equally.
D
Best answer
Replace the Blob Storage trigger with an Event Grid trigger and create a Blob Created event subscription that targets the Function's endpoint
Event Grid delivers blob creation events within seconds of the upload by pushing events rather than polling. The Function receives the event payload (which includes the blob URI) and begins processing immediately. This eliminates the polling delay inherent in the Blob Storage trigger on large accounts.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Azure Functions
- Event Grid trigger
- Blob Storage trigger polling delay
- near-real-time processing
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Azure Functions
Related practice questions
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Question 1
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Question 2
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Question 3
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Question 4
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Question 5
You are developing an Azure Function that processes messages from an Azure Service Bus queue. The function uses a Service Bus queue trigger and runs on a Consumption Plan. The queue receives a high volume of messages in bursts. You need to ensure that the function scales out to handle the load but does not exceed 10 concurrent instances. Which configuration should you apply?
Question 6
You are monitoring an Azure App Service using Application Insights. You notice that the server response time is high for certain requests. You need to drill down to see which external dependencies (like databases or APIs) are causing the delay. Which Application Insights feature should you use?
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Azure Functions
What is the correct answer to this question?
The correct answer is: Replace the Blob Storage trigger with an Event Grid trigger and create a Blob Created event subscription that targets the Function's endpoint — The Blob Storage trigger in Azure Functions uses a polling mechanism — it periodically scans the storage account for new blobs. On accounts with many blobs or containers, the polling interval increases to manage request costs, causing delays of up to 10 minutes. Event Grid emits a BlobCreated event within seconds of a blob upload. Using an Event Grid trigger on the Function (with a Blob Created event subscription pointing to the Function's endpoint) provides near-real-time triggering. This is the recommended pattern for time-sensitive blob processing.
What should I do if I get this AZ-204 question wrong?
Review azure Functions, then practise related AZ-204 questions on the same topic to reinforce the concept.
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