The answer is that the 'Source Repository Viewer' role is insufficient; the service account needs the 'Source Repository Reader' role or higher. This is because the Viewer role only grants permissions to list and view repository metadata, such as names and descriptions, but lacks the `source.repos.get` and `source.repos.read` permissions required for Git operations like cloning or pulling code. When a Vertex AI pipeline CustomJob component attempts to access a Cloud Source Repository to retrieve training code, the service account must have Reader-level access to execute those read operations, and the error occurs because the Viewer role blocks the actual data transfer. On the Google Professional Machine Learning Engineer exam, this tests your understanding of IAM role granularity in ML pipelines, often appearing as a trap where candidates assume any "view" role covers code access. A common memory tip is: "Viewer sees the label, Reader reads the label's content"—for Git pulls, you need Reader to actually fetch the files.
PMLE Collaborating to manage data and models Practice Question
This PMLE practice question tests your understanding of collaborating to manage data and models. 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.
A team uses Vertex AI Pipelines with CustomJob components that pull training code from a Cloud Source Repository. The pipeline fails with a 'Permission denied' error when trying to access the repository. The service account used by the pipeline has the 'Source Repository Viewer' role. What is the likely issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'Source Repository Viewer' role is insufficient; the service account needs 'Source Repository Reader' or higher
The 'Source Repository Viewer' role only allows listing and viewing repository metadata, not reading the actual source code. To clone or pull code from a Cloud Source Repository, the service account needs the 'Source Repository Reader' role (or higher), which grants the `source.repos.get` and `source.repos.read` permissions required for Git operations. The pipeline's CustomJob component fails because the service account lacks these permissions when attempting to access the repository.
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 training code contains a dependency that is not available in the custom container
Why it's wrong here
The error occurs at the repository access step, not during execution.
✓
The 'Source Repository Viewer' role is insufficient; the service account needs 'Source Repository Reader' or higher
Why this is correct
Reader role allows cloning and fetching, while Viewer only allows browsing.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pipeline is running in a different project than the repository; cross-project access is not supported
Why it's wrong here
Cross-project access is supported with proper IAM.
✗
The repository URL is incorrectly formatted; use the SSH URL instead of HTTPS
Why it's wrong here
The error message indicates a permission issue, not a URL format issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between IAM roles that grant read-only access to metadata versus those that grant actual data access, leading candidates to assume 'Viewer' is sufficient for reading source code.
Detailed technical explanation
How to think about this question
Cloud Source Repositories uses Git over HTTPS or SSH, and the service account must have the `source.repos.get` and `source.repos.read` permissions (granted by the 'Source Repository Reader' role) to authenticate and clone the repository. The 'Source Repository Viewer' role only includes `source.repos.list` and `source.repos.getIamPolicy`, which are insufficient for Git operations. In practice, you would also need to ensure the service account has the `iam.serviceAccounts.actAs` permission on the Compute Engine default service account if using a custom service account with Vertex AI Pipelines.
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.
TExam Day Tips
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Collaborating to manage data and models — This question tests Collaborating to manage data and models — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The 'Source Repository Viewer' role is insufficient; the service account needs 'Source Repository Reader' or higher — The 'Source Repository Viewer' role only allows listing and viewing repository metadata, not reading the actual source code. To clone or pull code from a Cloud Source Repository, the service account needs the 'Source Repository Reader' role (or higher), which grants the `source.repos.get` and `source.repos.read` permissions required for Git operations. The pipeline's CustomJob component fails because the service account lacks these permissions when attempting to access the repository.
What should I do if I get this PMLE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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