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Exam AWS Certified Solutions Architect - Professional topic 1 question 482 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional

Question #: 482
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

A company uses an Amazon EMR cluster to process data once a day. The raw data comes from Amazon S3, and the resulting processed data is also stored in
Amazon S3. The processing must complete within 4 hours; currently, it only takes 3 hours. However, the processing time is taking 5 to 10 minutes longer each week due to an increasing volume of raw data.
The team is also concerned about rising costs as the compute capacity increases. The EMR cluster is currently running on three m3.xlarge instances (one master and two core nodes).
Which of the following solutions will reduce costs related to the increasing compute needs?

A. Add additional task nodes, but have the team purchase an all-upfront convertible Reserved Instance for each additional node to offset the costs.
B. Add additional task nodes, but use instance fleets with the master node in on-Demand mode and a mix of On-Demand and Spot Instances for the core and task nodes. Purchase a scheduled Reserved Instance for the master node.
C. Add additional task nodes, but use instance fleets with the master node in Spot mode and a mix of On-Demand and Spot Instances for the core and task nodes. Purchase enough scheduled Reserved Instances to offset the cost of running any On-Demand instances.
D. Add additional task nodes, but use instance fleets with the master node in On-Demand mode and a mix of On-Demand and Spot Instances for the core and task nodes. Purchase a standard all-upfront Reserved Instance for the master node.

Show Suggested Answer

Suggested Answer: B 🗳️

by donathon at Sept. 23, 2019, 3:10 a.m.

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donathon

Highly Voted 3 years, 8 months ago

B A: The cost is only reduced for additional nodes and paying for all day instead of scheduled does not make sense. B: The key is Scheduled Reserved Instances. This are usually used for running batch jobs. C: You cannot have spot instances for the master node since there is no guarantee that you can get that instance running. D: All day RI does not make sense and will cost more.

upvoted 27 times

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Waiweng

Highly Voted 3 years, 7 months ago

It's D, schedule reserved instance no longer supported https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html

upvoted 14 times

tvs

3 years, 7 months ago

Agree but these exam question was created long back not sure exam systems are uptodate.

upvoted 2 times

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TiredDad

3 years, 7 months ago

"You cannot purchase Scheduled Reserved Instances at this time. AWS does not have any capacity available for Scheduled Reserved Instances or any plans to make it available in the future. To reserve capacity, use On-Demand Capacity Reservations instead. For discounted rates, use Savings Plans."

upvoted 2 times

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maxh8086

Most Recent 2 years, 5 months ago

Key here is : A company uses an Amazon EMR cluster to process data once a day. D

upvoted 1 times

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Binoj_1985

3 years, 6 months ago

Selected Answer: D

D - Since scheduled instances are no longer supported. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html

upvoted 1 times

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cldy

3 years, 6 months ago

D. Add additional task nodes, but use instance fleets with the master node in On-Demand mode and a mix of On-Demand and Spot Instances for the core and task nodes. Purchase a standard all-upfront Reserved Instance for the master node.

upvoted 1 times

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AzureDP900

3 years, 6 months ago

B is right

upvoted 1 times

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DerekKey

3 years, 7 months ago

D correct B wrong - have you noticed that answer B has "on-Demand" instead of "On-Demand" As already said Scheduled Instances are not available except in one region - Ireland.

upvoted 1 times

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WhyIronMan

3 years, 7 months ago

I'll go with B

upvoted 2 times

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Sunflyhome

3 years, 7 months ago

D. 1: We do not have any capacity for purchasing Scheduled Reserved Instances or any plans to make it available in the future. 2:When you buy Reserved Instances, the larger the upfront payment, the greater the discount. Master is always up.

upvoted 2 times

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Pupu86

3 years, 7 months ago

I believe this is an old question as scheduled reserve instance is no longer supported. Answer should be D. As the workload keeps increasing week by week, it also makes sense to pay all upfront cost for reserved instance for the master node (most amount of savings $$$ for something that is guaranteed with no performance change) and leave on-demand instances for core & spot instances for tasks instead.

upvoted 4 times

nitinz

3 years, 7 months ago

You are right, https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html

upvoted 2 times

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awsnoob

3 years, 7 months ago

should be D, reserve schedule instance is no longer supported

upvoted 1 times

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natpilot

3 years, 7 months ago

why not D? about B, view this link : https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html

upvoted 1 times

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Kian1

3 years, 7 months ago

going with B

upvoted 2 times

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newme

3 years, 7 months ago

B is correct in this question. But Scheduled Reserved Instances is no longer supported any more. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html

upvoted 2 times

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