Discuss Alibaba ACA-Operator Exam Topic 8 Question 99

A developer has written a web application using a microservice architecture,

in such an architecture, the client (web browser or mobile application) first initiates a request. The request first reaches the load balancer, then goes through an authentication service, a billing service, then requests a resource, and finally a result is returned. How many spans does such a call chain

consist of?

Suggested Answer: C

1-request, 2-load balancer, 3-authentication service, 4-billing service, 5- resource request

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19 comments · newest first

Emilio 16 days ago

Interesting perspectives!

Chanel 21 days ago

Not in my view. It’s just the outcome of the last service.

Yolando 27 days ago

But the result is a separate step, right?

Chanel 1 month ago

Load balancer, auth, billing, and resource. Result is part of the last span.

Emilio 1 month ago

What’s your reasoning?

Chanel 1 month ago

I’m leaning towards 4 spans.

Yolando 2 months ago

Load balancer, auth, billing, resource request, and result.

Emilio 2 months ago

Why 5?

Yolando 2 months ago

I think it’s 5 spans.

Emilio 2 months ago

This question is tricky!

Miesha 2 months ago

This is confusing, can someone explain the spans?

Anabel 2 months ago

I thought it was 6, but I guess 5 is right.

Carlee 3 months ago

Wait, are we counting the load balancer too?

Herminia 3 months ago

Totally agree, 5 makes sense!

Rebecka 3 months ago

There are 5 spans in that call chain.

Olive 3 months ago

I recall practicing a question that had a similar setup, and I think it was 5 spans.

Karol 3 months ago

I feel like the load balancer and each service should count, so maybe it's 4?

Emerson 3 months ago

I'm not entirely sure, but I remember a similar question where we counted each step. Could it be 6?

Malinda 4 months ago

I think there are 5 spans because each service in the chain counts as a span, right?

Alibaba ACA-Operator Exam - Topic 8 Question 99 Discussion