The answer is to configure a podDisruptionBudget and use regional persistent disks. This combination directly addresses the need for high availability during zonal failures because the podDisruptionBudget maintains a minimum quorum of running Pods, preventing the StatefulSet controller from stalling, while regional persistent disks replicate data across zones, allowing the scheduler to immediately reschedule a Pod in a surviving zone without waiting for a failed disk to detach or become available. On the Google Professional Cloud Developer exam, this scenario tests your understanding of how StatefulSet recovery interacts with GKE’s zonal failure domain; a common trap is assuming that regional disks alone are sufficient, but without a PDB the controller may block rescheduling to preserve data integrity. Remember the memory tip: “PDB keeps the quorum, regional disks keep the data—together they survive the zone.”
PCD Deploying applications Practice Question
This PCD practice question tests your understanding of deploying applications. 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 deploys a stateful application using StatefulSets on GKE. They need to store persistent data on regional persistent disks for high availability. However, during zonal failures, pods are not rescheduled quickly. What is the best approach to improve recovery time?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure podDisruptionBudget and use persistent disk with regional replication.
Option B is correct because configuring a podDisruptionBudget ensures that a minimum number of Pods remain available during voluntary disruptions, while using regional persistent disks (which replicate data across zones) allows the StatefulSet controller to quickly reschedule Pods in another zone without waiting for the failed zone's disk to become available. This combination minimizes downtime during zonal failures by maintaining quorum and ensuring data is already accessible in the surviving zone.
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.
✗
Increase the number of replicas in the StatefulSet.
Why it's wrong here
Increasing replicas does not guarantee quick recovery from zonal failure.
✓
Configure podDisruptionBudget and use persistent disk with regional replication.
Why this is correct
Regional PDs replicate across zones and PDB ensures minimum available pods during disruptions.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a headless service with external persistent storage like Filestore.
Why it's wrong here
Filestore is NFS, but does not directly address quick rescheduling during zonal failures.
✗
Use a Deployment instead of StatefulSet.
Why it's wrong here
Deployment is not suitable for stateful applications requiring stable identities and storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that increasing replicas alone improves availability during zonal failures, but the real bottleneck is the persistent volume's zonal binding, which requires regional replication to allow cross-zone attachment.
Detailed technical explanation
How to think about this question
Regional persistent disks in GKE are replicated synchronously across two zones, so when a zonal failure occurs, the disk can be attached to a Pod in the surviving zone without needing to copy data. The podDisruptionBudget (PDB) with a maxUnavailable of 0 or a minAvailable value ensures that the StatefulSet controller does not voluntarily evict Pods below the threshold, preventing split-brain scenarios and allowing the cluster to maintain quorum during upgrades or failures. Under the hood, the StatefulSet controller uses the PVC template to create a unique PVC per replica, and with regional PDs, the PVC is backed by a zonal disk that can be reattached in another zone via the GCE Persistent Disk CSI driver, which handles the attachment and detachment lifecycle.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deploying applications — This question tests Deploying applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure podDisruptionBudget and use persistent disk with regional replication. — Option B is correct because configuring a podDisruptionBudget ensures that a minimum number of Pods remain available during voluntary disruptions, while using regional persistent disks (which replicate data across zones) allows the StatefulSet controller to quickly reschedule Pods in another zone without waiting for the failed zone's disk to become available. This combination minimizes downtime during zonal failures by maintaining quorum and ensuring data is already accessible in the surviving zone.
What should I do if I get this PCD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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