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Salesforce Certified MuleSoft Developer II (Mule-Dev-301) Exam - Topic 3 Question 26 Discussion

Which pattern should be used to invoke multiple HTTP APIs in parallel and roll back failed requests in sequence?
C) Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes
A) A database as a transactional outbox and an Until Successful router to retry any requests
B) A Parallel for Each scope with each HTTP request wrapped in a Try scope
D) VM queues as a reliability pattern with error handlers to roll back any requests

Salesforce Certified MuleSoft Developer II (Mule-Dev-301) Exam - Topic 3 Question 26 Discussion

Actual exam question for Salesforce's Salesforce Certified MuleSoft Developer II (Mule-Dev-301) exam
Question #: 26
Topic #: 3
[All Salesforce Certified MuleSoft Developer II (Mule-Dev-301) Questions]

Which pattern should be used to invoke multiple HTTP APIs in parallel and roll back failed requests in sequence?

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Suggested Answer: C

To invoke multiple HTTP APIs in parallel and roll back failed requests in sequence, the developer should use a Scatter-Gather router as a central Saga orchestrator for all API requests with compensating actions for failing routes. A Scatter-Gather router executes multiple routes concurrently and aggregates the results. A Saga orchestrator coordinates a series of actions across different services and handles failures by executing compensating actions. Therefore, using a Scatter-Gather router as a Saga orchestrator allows invoking multiple HTTP APIs in parallel and rolling back any failed requests in sequence. Reference: https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-concept https://docs.mulesoft.com/mule-runtime/4.3/saga


by Jeffrey at Mar 06, 2025, 09:54 PM

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Paris
8 months ago
C is interesting, but can it really handle all those compensating actions effectively?
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Delisa
9 months ago
A sounds complicated, not sure if it's worth it.
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Josue
9 months ago
I think option C is the best choice for this scenario.
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Paulina
9 months ago
Wait, I thought D was the go-to for reliability patterns?
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Antonio
9 months ago
I disagree, B seems more straightforward for handling retries.
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Kristin
10 months ago
I was leaning towards option C as well, but I wonder if the VM queues could also work for reliability and rollback. It's a tough call!
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Deeanna
10 months ago
I feel like the Until Successful router could be useful, but I can't recall if it specifically handles rolling back requests.
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Onita
10 months ago
I'm not entirely sure, but I remember practicing a question about using a Try scope for error handling. Maybe the Parallel for Each scope is the way to go?
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Markus
10 months ago
I think the Scatter-Gather pattern might be the right choice since it allows for parallel processing and can handle compensating actions for failures.
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Antonio
10 months ago
The Scatter-Gather pattern with a Saga orchestrator sounds like the most comprehensive solution to me. It should allow for the parallel API calls and provide a way to handle the rollbacks if any requests fail. I think I'd go with that one.
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Roosevelt
11 months ago
I'm a bit confused by the VM queues and error handlers option. That doesn't seem like it would address the need for parallel processing and rollbacks. I'm leaning more towards the Scatter-Gather or Parallel for Each approaches.
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Lisha
11 months ago
I'm pretty confident the database transactional outbox and Until Successful router is the way to go here. That pattern seems well-suited for handling the parallel API calls and retrying failed requests.
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Alease
11 months ago
Hmm, the Parallel for Each scope with Try scopes seems like a simpler solution that could also work. I'd want to double-check the details, but that might be a good option to consider.
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Stefany
11 months ago
This looks like a tricky one. I'm not sure I fully understand the different patterns mentioned, but I think the Scatter-Gather approach with a Saga orchestrator sounds like it could work for handling the parallel API calls and rollbacks.
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Luisa
1 year ago
A database as a transactional outbox? Now that's an interesting approach. I'd have to read up more on that, but it could be a clever way to handle the rollbacks.
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Kimberlie
1 year ago
A database as a transactional outbox? That sounds like a solid strategy for handling failed requests.
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Kiley
1 year ago
C) Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes
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Asuncion
1 year ago
A) A database as a transactional outbox and an Until Successful router to retry any requests
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Brunilda
1 year ago
I'm leaning towards option B, it seems like a practical approach.
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Lashandra
1 year ago
Haha, option D with VM queues and error handlers? Sounds like a whole lot of complexity just for a few API calls. I'll pass on that one.
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Miriam
1 year ago
User 3: Yeah, using a database as a transactional outbox and retrying failed requests with an Until Successful router sounds more straightforward.
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Carlene
1 year ago
User 2: Maybe option A would be a simpler choice for handling multiple HTTP APIs in parallel.
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Louvenia
1 year ago
User 1: I agree, option D does seem overly complex for just a few API calls.
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Nettie
1 year ago
I would go with option D, it seems like a safe bet.
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Tracey
1 year ago
I disagree, I believe option A is more reliable.
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Louvenia
1 year ago
Hmm, B sounds good too. Parallel processing with error handling could work well, especially for simpler use cases.
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Arlette
1 year ago
I think option C is the way to go. Scatter-Gather with a Saga orchestrator sounds like the most robust and scalable solution to me.
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Hermila
1 year ago
I prefer option B, using a Parallel for Each scope with Try scopes for each HTTP request.
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Mee
1 year ago
I think option A could also work well, using a database as a transactional outbox for retrying failed requests.
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Reiko
1 year ago
I agree, option C seems like the best choice for invoking multiple HTTP APIs in parallel.
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Pauline
2 years ago
I think option C is the best choice.
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