- A
Use a side input to filter malformed events before the main pipeline
Why wrong: Side inputs are for joining additional data, not error handling.
- B
Use the Reshuffle transform to reattempt failures
Why wrong: Reshuffle is used to repartition data, not for error handling.
- C
Write malformed events to a dead letter sink (e.g., another Pub/Sub topic or GCS bucket) and continue processing healthy events
Dead letter sink is the correct pattern: isolate bad records and let the pipeline proceed.
- D
Use logging alerts to notify the team and stop the pipeline on error
Why wrong: Stopping the pipeline on error is not desired; the team wants to continue processing.
Question 756 of 1,000
PDE Ingesting and Processing the Data Practice Question
This PDE practice question tests your understanding of ingesting and processing the data. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is using Pub/Sub to ingest clickstream events and Dataflow to write to BigQuery. They observe that some events are malformed and cause the pipeline to fail. They need a solution that captures malformed events without blocking the pipeline and allows reprocessing later. Which Dataflow pattern should they implement?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Write malformed events to a dead letter sink (e.g., another Pub/Sub topic or GCS bucket) and continue processing healthy events
Dead letter sinks (DLQ) are the standard pattern for handling bad records in Dataflow. The pipeline writes malformed records to a separate sink (e.g., Pub/Sub topic or GCS) for later analysis. Side inputs are for enriching data, not error handling. Reshuffle doesn't apply. Output tags (side outputs) can also be used, but explicit dead letter pattern is more standard.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a side input to filter malformed events before the main pipeline
Why it's wrong here
Side inputs are for joining additional data, not error handling.
- ✗
Use the Reshuffle transform to reattempt failures
Why it's wrong here
Reshuffle is used to repartition data, not for error handling.
- ✓
Write malformed events to a dead letter sink (e.g., another Pub/Sub topic or GCS bucket) and continue processing healthy events
Why this is correct
Dead letter sink is the correct pattern: isolate bad records and let the pipeline proceed.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use logging alerts to notify the team and stop the pipeline on error
Why it's wrong here
Stopping the pipeline on error is not desired; the team wants to continue processing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which PDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Ingesting and Processing the Data — study guide chapter
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FAQ
Questions learners often ask
What does this PDE question test?
Ingesting and Processing the Data — This question tests Ingesting and Processing the Data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Write malformed events to a dead letter sink (e.g., another Pub/Sub topic or GCS bucket) and continue processing healthy events — Dead letter sinks (DLQ) are the standard pattern for handling bad records in Dataflow. The pipeline writes malformed records to a separate sink (e.g., Pub/Sub topic or GCS) for later analysis. Side inputs are for enriching data, not error handling. Reshuffle doesn't apply. Output tags (side outputs) can also be used, but explicit dead letter pattern is more standard.
What should I do if I get this PDE question wrong?
Identify which PDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PDE exam.
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