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Exam AWS Certified Solutions Architect - Professional topic 1 question 199 discussion

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

Question #: 199
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

With Amazon Elastic MapReduce (Amazon EMR) you can analyze and process vast amounts of data. The cluster is managed using an open-source framework called Hadoop. You have set up an application to run Hadoop jobs. The application reads data from DynamoDB and generates a temporary file of 100 TBs.
The whole process runs for 30 minutes and the output of the job is stored to S3.
Which of the below mentioned options is the most cost effective solution in this case?

A. Use Spot Instances to run Hadoop jobs and configure them with EBS volumes for persistent data storage.
B. Use Spot Instances to run Hadoop jobs and configure them with ethereal storage for output file storage.
C. Use an on demand instance to run Hadoop jobs and configure them with EBS volumes for persistent storage.
D. Use an on demand instance to run Hadoop jobs and configure them with ephemeral storage for output file storage.

Show Suggested Answer

Suggested Answer: B 🗳️
AWS EC2 Spot Instances allow the user to quote his own price for the EC2 computing capacity. The user can simply bid on the spare Amazon EC2 instances and run them whenever his bid exceeds the current Spot Price. The Spot Instance pricing model complements the On-Demand and Reserved Instance pricing models, providing potentially the most cost-effective option for obtaining compute capacity, depending on the application. The only challenge with a Spot Instance is data persistence as the instance can be terminated whenever the spot price exceeds the bid price. In the current scenario a Hadoop job is a temporary job and does not run for a longer period. It fetches data from a persistent DynamoDB. Thus, even if the instance gets terminated there will be no data loss and the job can be re- run. As the output files are large temporary files, it will be useful to store data on ethereal storage for cost savings.
Reference:
http://aws.amazon.com/ec2/purchasing-options/spot-instances/

by skywalker at Nov. 3, 2019, 1:32 p.m.

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Comments

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amog

Highly Voted 3 years, 8 months ago

Answer is B "the output of the job is stored on S3". Ephemeral storage is using to store temporary data in this case

upvoted 8 times

robertomartinez

3 years, 7 months ago

B says ethereal storage, so it's A

upvoted 1 times

bobsmith2000

3 years, 1 month ago

It's a typo. Don't read into it. There are a while bunch of questions here with typos

upvoted 1 times

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amministrazione

Most Recent 10 months, 2 weeks ago

B. Use Spot Instances to run Hadoop jobs and configure them with Ephemeral storage for output file storage.

upvoted 1 times

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KungLjao

1 year, 10 months ago

Ephemeral storage does not support more than a few Tb.. https://allcloud.io/blog/ec2-ephemeral-storage-size-per-instance-type/ Answer is A

upvoted 1 times

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cldy

3 years, 6 months ago

B. Use Spot Instances to run Hadoop jobs and configure them with ethereal storage for output file storage.

upvoted 1 times

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01037

3 years, 8 months ago

Sure B

upvoted 1 times

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Madwyn

3 years, 8 months ago

Use spot for cost. Not A because EBS for persistent data storage is not cost efficient, you may use S3. B not because EBS is limited to 16TB, Hadoop forms a cluster, it doesn't require each node to have 100TB storage, that's silly.

upvoted 1 times

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newme

3 years, 8 months ago

Where to find price of instance store? And how to add instance store to an instance? I followed instructions from https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/add-instance-store-volumes.html#adding-instance-storage-instance but there is no instance store in Volume Type.

upvoted 1 times

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MarkDillon1075

3 years, 8 months ago

'Ethereal' is just a typo. The same question pops up on other sites and its 'Ephemeral' So the answer is B

upvoted 1 times

robertomartinez

3 years, 7 months ago

How can you affirm it's a typo, to me answer is A because "ethereal storage" does not exists. If it's really a Typo (that's a lot of misplaced chars) then answer is B. If I had this on the day of the exam I'd chose A assuming B is misleading because of the wrong use of term ethereal storage with means nothings

upvoted 2 times

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Paramg1234

3 years, 8 months ago

This is tricky .... B is the right answer because EBS will not support more than 16 TBs, the remaining choice is B (Although no such thing like ethereal storage)

upvoted 1 times

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JAWS1600

3 years, 8 months ago

A is the right answer

upvoted 1 times

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JAWS1600

3 years, 8 months ago

Epheremal may not work in this case. Because of 100TB ( FILE size). Instance stores are not available to accomodate this size. https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/volume_limits.html

upvoted 3 times

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NKnab

3 years, 8 months ago

b is what aws wants you to do - https://aws.amazon.com/blogs/aws/run-amazon-elastic-mapreduce-on-ec2-spot-instances/

upvoted 2 times

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NNHAN

3 years, 8 months ago

Answer is C B spot instance might be interrupted any time.

upvoted 1 times

sam422

3 years, 8 months ago

Requirement is cost effectivem , Amog comment makes sense

upvoted 3 times

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manishgp

3 years, 8 months ago

Answer is B See the emphasis on "most cost-effective"

upvoted 4 times

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skywalker

3 years, 9 months ago

shouldn't this be "A" since there is no such thing as "ethereal storage" as mentioned in B?

upvoted 2 times

skywalker

3 years, 9 months ago

If "B" is refer to Ephemeral Storage... then the output will be lost the moment spot instance is terminate.. Output will thus be lost.. Having output stored in EBS which is persistent is a better option.. right? So answer should still be "A"???

upvoted 2 times

examacc

3 years, 9 months ago

I think B is ok assuming ephermal storage. as it is not the final destination. Final destination is still S3. It is talking about processed data i beleive.

upvoted 5 times

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