Exam Professional Data Engineer topic 1 question 241 discussion

Actual exam question from Google's Professional Data Engineer

Question #: 241
Topic #: 1

[All Professional Data Engineer Questions]

You are designing the architecture of your application to store data in Cloud Storage. Your application consists of pipelines that read data from a Cloud Storage bucket that contains raw data, and write the data to a second bucket after processing. You want to design an architecture with Cloud Storage resources that are capable of being resilient if a Google Cloud regional failure occurs. You want to minimize the recovery point objective (RPO) if a failure occurs, with no impact on applications that use the stored data. What should you do?

A. Adopt multi-regional Cloud Storage buckets in your architecture.
B. Adopt two regional Cloud Storage buckets, and update your application to write the output on both buckets.
C. Adopt a dual-region Cloud Storage bucket, and enable turbo replication in your architecture.
D. Adopt two regional Cloud Storage buckets, and create a daily task to copy from one bucket to the other.

Show Suggested Answer

Suggested Answer: C 🗳️

by scaenruy at Jan. 3, 2024, 2:06 p.m.

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raaad

Highly Voted 1 year, 5 months ago

Selected Answer: C

- Dual-region buckets are a specific type of storage that automatically replicates data between two geographically distinct regions. - Turbo replication is an enhanced feature that provides faster replication between the two regions, thus minimizing RPO. - This option ensures that your data is resilient to regional failures and is replicated quickly, meeting the needs for low RPO and no impact on application performance.

upvoted 12 times

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CGS22

Highly Voted 1 year, 2 months ago

Selected Answer: A

A. Adopt multi-regional Cloud Storage buckets in your architecture. Why A is the best choice: Automatic Cross-Region Replication: Multi-regional buckets automatically replicate data across multiple geographically separated regions within a selected multi-region location (e.g., us). This ensures data redundancy and availability even if one region experiences an outage. Minimal RPO: Data written to a multi-regional bucket is synchronously replicated to at least two regions. This means that in the event of a regional failure, the RPO is essentially zero, as the data is already available in other regions. No Application Changes: Applications can continue reading and writing data to the multi-regional bucket without any modifications, as the cross-region replication is handled transparently by Cloud Storage

upvoted 5 times

mdell

6 months ago

Minimal yet, but not minimized as stated in the question. That's why C is correct. Turbo replication provides faster redundancy across regions for data in your dual-region buckets, which reduces the risk of data loss exposure and helps support uninterrupted service following a regional outage. When enabled, turbo replication is designed to replicate 100% of newly written objects to the two regions that constitute a dual-region within the recovery point objective of 15 minutes, regardless of object size. Note that even for default replication, most objects finish replication within minutes. https://cloud.google.com/storage/docs/availability-durability#turbo-replication

upvoted 1 times

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petulda

Most Recent 6 months, 3 weeks ago

Why not A https://cloud.google.com/storage/docs/locations multi regional location has cross region redundancy

upvoted 1 times

1 year, 5 months ago

Selected Answer: A

A. Adopt multi-regional Cloud Storage buckets in your architecture.

upvoted 2 times

datapassionate

1 year, 5 months ago

It wont be a correct answer. Correct is C. It is required "no impact on applications that use the stored data"

upvoted 3 times

ashdam

1 year, 3 months ago

But multi-region is completely transparent for the application if one fails. it would need to fail all EU or US regions. I dont undertand why multi-region would have impact on that

upvoted 1 times

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datapassionate

1 year, 5 months ago

Whereas with multi-region " it can also introduce unpredictable latency into the response time and higher network egress charges for cloud workloads when multi-region data is read from remote regions" https://cloud.google.com/blog/products/storage-data-transfer/choose-between-regional-dual-region-and-multi-region-cloud-storage

upvoted 4 times

ashdam

1 year, 3 months ago

There is no requirment on latency, just RPO which it would be 0 since multi-region.

upvoted 2 times

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