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Question 44 - Certified MuleSoft Developer I discussion

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A new upstream API Is being designed to offer an SLA of 500 ms median and 800 ms maximum (99th percentile) response time. The corresponding API implementation needs to sequentially invoke 3 downstream APIs of very similar complexity.

The first of these downstream APIs offers the following SLA for its response time: median: 100 ms, 80th percentile: 500 ms, 95th percentile: 1000 ms.

If possible, how can a timeout be set in the upstream API for the invocation of the first downstream API to meet the new upstream API's desired SLA?

A.
Set a timeout of 50 ms; this times out more invocations of that API but gives additional room for retries
Answers
A.
Set a timeout of 50 ms; this times out more invocations of that API but gives additional room for retries
B.
Set a timeout of 100 ms; that leaves 400 ms for the other two downstream APIs to complete
Answers
B.
Set a timeout of 100 ms; that leaves 400 ms for the other two downstream APIs to complete
C.
No timeout is possible to meet the upstream API's desired SLA; a different SLA must be negotiated with the first downstream API or invoke an alternative API
Answers
C.
No timeout is possible to meet the upstream API's desired SLA; a different SLA must be negotiated with the first downstream API or invoke an alternative API
D.
Do not set a timeout; the Invocation of this API Is mandatory and so we must wait until it responds
Answers
D.
Do not set a timeout; the Invocation of this API Is mandatory and so we must wait until it responds
Suggested answer: B

Explanation:

Set a timeout of 100ms; that leaves 400ms for other twodownstream APIs to complete. Key details to take from the given scenario:>> Upstream API's designed SLA is 500ms (median). Lets ignore maximum SLA response times.>> This API calls 3 downstream APIs sequentially and all these are of similar complexity.>> The first downstream API is offering median SLA of 100ms, 80th percentile: 500ms; 95th percentile: 1000ms.Based on the above details:>> We can rule out the option which is suggesting to set 50ms timeout. Because, if the median SLA itself being offered is 100ms then most of the calls are going to timeout and time gets wasted in retried them and eventually gets exhausted with all retries. Even if some retries gets successful, the remaining time wont leave enough room for 2nd and 3rd downstream APIs to respond within time.>> The option suggesting to NOT set a timeout as the invocation of this API is mandatory and so we must wait until it responds is silly. As not setting time out would go against the good implementation pattern and moreover if the first API is not responding within its offered median SLA 100ms then most probably it would either respond in 500ms (80th percentile) or 1000ms (95th percentile). In BOTH cases, getting a successful response from 1st downstream API does NO GOOD because already by this time the Upstream API SLA of 500 ms is breached. There is no time left to call 2nd and 3rd downstream APIs.>> It is NOT true that no timeout is possible to meet the upstream APIs desired SLA.As 1st downstream API is offering its median SLA of 100ms, it means MOST of the time we would get the responses within that time. So, setting a timeout of 100ms would be ideal for MOST calls as it leaves enough room of 400ms for remaining 2 downstream API calls.

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asked 23/09/2024
Scott Lerch
27 questions
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