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Exam Professional Cloud Developer topic 1 question 67 discussion

Actual exam question from Google's Professional Cloud Developer
Question #: 67
Topic #: 1
[All Professional Cloud Developer Questions]

You configured your Compute Engine instance group to scale automatically according to overall CPU usage. However, your application's response latency increases sharply before the cluster has finished adding up instances. You want to provide a more consistent latency experience for your end users by changing the configuration of the instance group autoscaler.
Which two configuration changes should you make? (Choose two.)

  • A. Add the label ג€AUTOSCALEג€ to the instance group template.
  • B. Decrease the cool-down period for instances added to the group.
  • C. Increase the target CPU usage for the instance group autoscaler.
  • D. Decrease the target CPU usage for the instance group autoscaler.
  • E. Remove the health-check for individual VMs in the instance group.
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Suggested Answer: BD 🗳️
by whigy at Nov. 13, 2020, 12:04 p.m.

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donchick
Highly Voted 3 years, 10 months ago
I'd choose B and D.
upvoted 16 times
fraloca
3 years, 10 months ago
For me the answer is B and D. "A cool down period value that is significantly longer causing a delay in scaling out". https://cloud.google.com/compute/docs/autoscaler#cool_down_period https://cloud.google.com/compute/docs/autoscaler/scaling-cpu#scaling_based_on_cpu_utilization
upvoted 5 times
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santoshchauhan
Most Recent 7 months, 3 weeks ago
Selected Answer: BD
B. Decrease the cool-down period for instances added to the group: The cool-down period is the time the autoscaler waits after a new instance is healthy before it collects usage metrics from the instance. A shorter cool-down period allows the autoscaler to react more quickly to changes in load, potentially starting to scale up sooner when there is a sudden increase in traffic. D. Decrease the target CPU usage for the instance group autoscaler: Lowering the target CPU utilization means that the autoscaler will start adding instances sooner as the CPU usage approaches the lower target. This can help to alleviate the issue where response latency increases sharply because new instances are added before the CPU usage hits a higher threshold.
upvoted 1 times
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__rajan__
1 year, 1 month ago
Selected Answer: BD
B and D are the best option here.
upvoted 1 times
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omermahgoub
1 year, 9 months ago
Options B and D are correct. To provide a more consistent latency experience for your end users, you should make the following configuration changes: Option B: Decrease the cool-down period for instances added to the group. The cool-down period is the time that must pass before the instance group autoscaler can add more instances after it has already added instances to the group. Decreasing the cool-down period can allow the instance group to scale more quickly in response to changes in CPU usage, which may help to reduce latency. Option D: Decrease the target CPU usage for the instance group autoscaler. The target CPU usage is the average CPU usage that the instance group autoscaler aims to maintain for the group. Decreasing the target CPU usage may allow the instance group to scale down more quickly in response to changes in CPU usage, which may also help to reduce latency.
upvoted 4 times
omermahgoub
1 year, 9 months ago
Option A is not a correct solution because adding the label "AUTOSCALE" to the instance group template will not affect the configuration of the instance group autoscaler
upvoted 1 times
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omermahgoub
1 year, 9 months ago
Option C is not a correct solution because increasing the target CPU usage for the instance group autoscaler will not help to reduce latency.
upvoted 1 times
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omermahgoub
1 year, 9 months ago
Option E is not a correct solution because removing the health-check for individual VMs in the instance group may not improve latency and could potentially cause other issues with the instance group.
upvoted 1 times
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tomato123
2 years, 2 months ago
Selected Answer: BD
BD are correct
upvoted 3 times
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GCPCloudArchitectUser
2 years, 8 months ago
Selected Answer: BD
I would choose these two
upvoted 3 times
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syu31svc
3 years, 3 months ago
Adding label won't solve the issue so A is wrong for sure Removing health check is not recommended so E is wrong as well Increase CPU target is wrong since scaling will take place at a higher usage which is not what we want B and D are the correct options
upvoted 4 times
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whigy
3 years, 11 months ago
D is more correct than C. If C, the auto-scale up will be further delayed
upvoted 2 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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