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Google Professional Data Engineer Exam - Topic 5 Question 50 Discussion

You have Cloud Functions written in Node.js that pull messages from Cloud Pub/Sub and send the data to BigQuery. You observe that the message processing rate on the Pub/Sub topic is orders of magnitude higher than anticipated, but there is no error logged in Stackdriver Log Viewer. What are the two most likely causes of this problem? Choose 2 answers.
C) Error handling in the subscriber code is not handling run-time errors properly. and D) The subscriber code cannot keep up with the messages.
A) Publisher throughput quota is too small.
B) Total outstanding messages exceed the 10-MB maximum.
E) The subscriber code does not acknowledge the messages that it pulls.

Google Professional Data Engineer Exam - Topic 5 Question 50 Discussion

Actual exam question for Google's Professional Data Engineer exam
Question #: 50
Topic #: 5
[All Professional Data Engineer Questions]

You have Cloud Functions written in Node.js that pull messages from Cloud Pub/Sub and send the data to BigQuery. You observe that the message processing rate on the Pub/Sub topic is orders of magnitude higher than anticipated, but there is no error logged in Stackdriver Log Viewer. What are the two most likely causes of this problem? Choose 2 answers.

Show Suggested Answer Hide Answer
Suggested Answer: C, D

by Mitsue at May 07, 2022, 05:14 AM

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Ulysses
10 months ago
Are we sure it's not an issue with error handling? Seems odd.
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Quinn
10 months ago
Wow, I didn't realize the subscriber could fall behind like that!
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Fairy
11 months ago
I disagree, I don't think A is the issue here.
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Tiffiny
11 months ago
I think B could be a factor too. 10-MB limit is pretty low!
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Velda
11 months ago
Definitely D and E. Sounds like the subscriber is lagging.
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Freeman
11 months ago
I keep thinking about error handling. If the subscriber code isn't catching runtime errors properly, could that be causing the slowdown without logging any errors?
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Aileen
11 months ago
I feel like we had a practice question about message limits in Pub/Sub. Could the total outstanding messages exceeding the 10-MB max be a factor here?
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Vallie
11 months ago
I'm not entirely sure, but I think if the subscriber isn't acknowledging messages, that could lead to a backlog.
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Chau
11 months ago
I remember we discussed something about subscriber performance in class. Could it be that the subscriber code just can't keep up with the message rate?
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Beatriz
11 months ago
I'm a little confused by the mention of SAFe principles. Does that mean the Scrum Master's role goes beyond just Scrum? I'll need to think about how that fits into the answer.
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Jamika
11 months ago
I think the most important thing is that the teams are all on the same page about what "Done" means, so that the final product is ready to be released. Option D seems to capture that best.
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Latosha
11 months ago
Okay, I've got this. Cisco TrustSec uses software-defined segmentation to manage network access and security policies. That sounds like exactly what the question is asking about. I'm confident this is the right answer.
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Theodora
11 months ago
Okay, I think I can handle this. The key is to use the formula for the 90% confidence interval for the mean when the population standard deviation is known.
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