AZ-204 Develop Azure compute solutions Practice Question
A Durable Functions workflow for a booking backend must call five independent activity functions and continue only after all results are available. Which pattern is appropriate?
⚠ Common exam trap
Candidates often confuse the fan-out/fan-in pattern with function chaining, mistakenly thinking that sequential execution is sufficient, or they incorrectly apply the Monitor pattern when the requirement is simply parallel execution without polling.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Fan-out/fan-in
The fan-out/fan-in pattern is designed for scenarios where multiple independent tasks must execute in parallel, and the workflow must wait for all results before proceeding. In Durable Functions, this is implemented using `Task.WhenAll()` to fan out activity function calls and then aggregate their results, which matches the requirement of calling five independent activities and continuing only after all results are available.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Monitor pattern
Why it's wrong here
Monitor pattern periodically checks external state.
- ✓
Fan-out/fan-in
Why this is correct
Fan-out/fan-in runs activities in parallel and aggregates results after all complete.
- ✗
Human interaction
Why it's wrong here
Human interaction waits for external manual approval or event.
- ✗
Function chaining
Why it's wrong here
Function chaining runs steps sequentially.
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