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Exam Associate Cloud Engineer topic 1 question 124 discussion

Actual exam question from Google's Associate Cloud Engineer
Question #: 124
Topic #: 1
[All Associate Cloud Engineer Questions]

You have an application that uses Cloud Spanner as a backend database. The application has a very predictable traffic pattern. You want to automatically scale up or down the number of Spanner nodes depending on traffic. What should you do?

  • A. Create a cron job that runs on a scheduled basis to review Cloud Monitoring metrics, and then resize the Spanner instance accordingly.
  • B. Create a Cloud Monitoring alerting policy to send an alert to oncall SRE emails when Cloud Spanner CPU exceeds the threshold. SREs would scale resources up or down accordingly.
  • C. Create a Cloud Monitoring alerting policy to send an alert to Google Cloud Support email when Cloud Spanner CPU exceeds your threshold. Google support would scale resources up or down accordingly.
  • D. Create a Cloud Monitoring alerting policy to send an alert to webhook when Cloud Spanner CPU is over or under your threshold. Create a Cloud Function that listens to HTTP and resizes Spanner resources accordingly.
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Suggested Answer: D 🗳️
by GCP_Student1 at March 11, 2021, 10:54 p.m.

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GCP_Student1
Highly Voted 3 years, 8 months ago
D. Create a Cloud Monitoring alerting policy to send an alert to webhook when Cloud Spanner CPU is over or under your threshold. Create a Cloud Function that listens to HTTP and resizes Spanner resources accordingly.
upvoted 26 times
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theBestStudent
Highly Voted 2 years, 3 months ago
Selected Answer: D
Without knowing that much, you can discard easily B,C as they don't make any sense. Automation should be a key in this answer. Also you should discard "A" as with a CronJob you won't spann on time as it will be a fixed time checking. So the only one that is left is D, as just creating an alert and sending it to "something else" (in this case a webhook) in an automated way, should be the common sense way of handling this.
upvoted 10 times
FeaRoX
1 year, 10 months ago
Isn't "fixed time chacking" appropriate for quote : very predictable traffic pattern?
upvoted 2 times
space_cadet
1 year, 9 months ago
Crossed my mind too, but why check every time when you can trigger a response when it happens. Predictability can also be used to determine the threshold.
upvoted 2 times
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BuenaCloudDE
Most Recent 4 months, 1 week ago
Why not A if traffic very predictable?
upvoted 1 times
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cooldude26
1 year ago
Selected Answer: D
The most suitable approach to automatically scale the number of Cloud Spanner nodes based on predictable traffic patterns is: D. Create a Cloud Monitoring alerting policy to send an alert to a webhook when Cloud Spanner CPU is over or under your threshold. Create a Cloud Function that listens to HTTP and resizes Spanner resources accordingly. This option utilizes Cloud Monitoring alerts and Cloud Functions to dynamically scale Cloud Spanner resources based on CPU thresholds, providing an automated and responsive solution.
upvoted 2 times
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scanner2
1 year, 2 months ago
Selected Answer: D
Correct answer is D.
upvoted 1 times
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Captain1212
1 year, 2 months ago
Selected Answer: D
D is the correct Answer as B or C does not do it automatically, and a doesnot use for long spanning
upvoted 1 times
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temppp
1 year, 11 months ago
Why not A is correct as question suggested specific time where as D is like an unpredectiable time?
upvoted 3 times
jrisl1991
1 year, 10 months ago
Because even though the traffic has a clear pattern, if the traffic changes one day (like a special holiday for ecommerce websites), you wouldn't be able to serve accordingly. It's never a good practice use fixed jobs for time-based traffic issues.
upvoted 3 times
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roaming_panda
1 year, 11 months ago
D is definitely correct .. people
upvoted 1 times
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abirroy
2 years, 4 months ago
Selected Answer: D
Correct answer is D
upvoted 1 times
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AzureDP900
2 years, 5 months ago
D is correct, It is part of Tutorials Dojo practice test
upvoted 1 times
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rsuresh27
2 years, 7 months ago
Answer is D. The keyword to look for is "automatically". A, B, C all have steps that are not automatic. Thus, only D is left.
upvoted 3 times
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alaahakim
3 years ago
D is the answer
upvoted 3 times
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Ricky_92
3 years ago
https://cloud.google.com/architecture/autoscaling-cloud-spanner
upvoted 5 times
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kukabura
3 years, 1 month ago
D is the answer
upvoted 3 times
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ankatsu2010
3 years, 1 month ago
It's a tricky question. The answer is 'A'. Question says traffic pattern is predictable. This means you can schedule the scalability. You can achieve this easily by using Cloud Spanner's API. https://cloud.google.com/spanner/docs/reference/rest/v1/projects.instances/patch
upvoted 4 times
BobbyFlash
3 years, 1 month ago
Really tricky indeed...But if you think about it and you don't stick religiously to "traffic pattern is predictable" sentence (that sentence is to trick you), you would think that despite the pattern is very predictable, it could vary at some point in time. With a cron job you can schedule a job using a fixed starting point and a a fixed ending, can't you? Well, what would happen if the app traffic suddenly spikes before your cron job starts running? Or after?. At this point, I go for D, making scalability automatic thanks to Cloud Funtions.
upvoted 6 times
kuracpalac
9 months, 2 weeks ago
I would say A also, as your explanation doesn't satisfy me, as the question is really clear that traffic is predictable. It doesn't mention any wiggle room.
upvoted 1 times
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erikamrqz
3 years, 1 month ago
D 205%
upvoted 5 times
bubblegumbeach
3 years, 1 month ago
seriously? 205%?
upvoted 4 times
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jcols
3 years, 6 months ago
Option D. There's an official repository that does something similar to provide autoscaling to Cloud Spanner. https://github.com/cloudspannerecosystem/autoscaler
upvoted 2 times
zaxxon
3 years, 1 month ago
Which uses a Cloud Scheduler so answer A
upvoted 2 times
ryumada
2 years, 3 months ago
"...and then resize the Spanner instance accordingly." I think the last sentence says that the resize action is done manually. If so, then D is still the right answer.
upvoted 1 times
ryumada
2 years, 3 months ago
For the D option, "Create a Cloud Function that listens to HTTP and resizes Spanner resources accordingly." The listen and resize actions is done by Cloud Function.
upvoted 1 times
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