- A
The pipeline is using a different version of the Wrangler plugin
Why wrong: Version mismatch could cause issues, but the most common cause is the plugin not being deployed at all.
- B
The Cloud Storage bucket is in a different region than the Data Fusion instance
Why wrong: Region mismatch typically causes network errors, not invalid directive errors.
- C
The Wrangler plugin is not deployed in the Cloud Data Fusion instance
The Cloud Data Fusion studio uses a different environment than the pipeline runtime. The Wrangler plugin must be deployed in the runtime environment; otherwise, directives fail.
- D
The service account used in the pipeline does not have permissions to write to BigQuery
Why wrong: While permissions could cause failure, the error is specifically about an invalid Wrangler directive, which points to a plugin issue.
PDE Designing Data Processing Systems Practice Question
This PDE practice question tests your understanding of designing data processing systems. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Your company uses Cloud Data Fusion to build ETL pipelines. You have a pipeline that reads from Cloud Storage, transforms data using a custom Wrangler recipe, and writes to BigQuery. The pipeline is failing with an error indicating that the Wrangler directive is invalid. You have verified the recipe works in the Cloud Data Fusion Studio. What is the most likely cause of the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The Wrangler plugin is not deployed in the Cloud Data Fusion instance
When a pipeline that works in the studio fails at runtime, common issues include differences in environment (e.g., runtime arguments, service account permissions, or plugin versions). But the most likely cause is that the pipeline configuration does not include the necessary plugins or the runtime environment is missing the required artifacts. In Cloud Data Fusion, the studio uses a local or preview environment, while the pipeline runs on a separate Cloud Data Fusion instance with its own set of plugins. If the Wrangler plugin is not deployed to the runtime environment, the directive will fail.
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.
- ✗
The pipeline is using a different version of the Wrangler plugin
Why it's wrong here
Version mismatch could cause issues, but the most common cause is the plugin not being deployed at all.
- ✗
The Cloud Storage bucket is in a different region than the Data Fusion instance
Why it's wrong here
Region mismatch typically causes network errors, not invalid directive errors.
- ✓
The Wrangler plugin is not deployed in the Cloud Data Fusion instance
Why this is correct
The Cloud Data Fusion studio uses a different environment than the pipeline runtime. The Wrangler plugin must be deployed in the runtime environment; otherwise, directives fail.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The service account used in the pipeline does not have permissions to write to BigQuery
Why it's wrong here
While permissions could cause failure, the error is specifically about an invalid Wrangler directive, which points to a plugin issue.
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.
- →
Designing Data Processing Systems — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PDE question test?
Designing Data Processing Systems — This question tests Designing Data Processing Systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Wrangler plugin is not deployed in the Cloud Data Fusion instance — When a pipeline that works in the studio fails at runtime, common issues include differences in environment (e.g., runtime arguments, service account permissions, or plugin versions). But the most likely cause is that the pipeline configuration does not include the necessary plugins or the runtime environment is missing the required artifacts. In Cloud Data Fusion, the studio uses a local or preview environment, while the pipeline runs on a separate Cloud Data Fusion instance with its own set of plugins. If the Wrangler plugin is not deployed to the runtime environment, the directive will fail.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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