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PDE Practice Question: Which TWO actions are recommended to improve the…
Which TWO actions are recommended to improve the reliability of a Cloud Dataflow streaming pipeline that processes event data from Pub/Sub?
⚠ Common exam trap
Many exam-takers confuse reliability with throughput or latency, and may incorrectly choose micro-batching or disabling autoscaling as reliability improvements, when in fact Dataflow's reliability comes from its managed backend services like Streaming Engine.
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
✓
Enable Dataflow Streaming Engine.
Enabling Dataflow Streaming Engine moves state and computation from worker VMs to the backend service, reducing the impact of worker scaling and preemption. This improves reliability by providing consistent performance and fault tolerance for streaming pipelines, especially those with high throughput or stateful processing.
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 pull subscription with a 10-second acknowledgment deadline.
Why it's wrong here
Short ack deadlines can cause duplicates and processing failures.
- ✓
Enable Dataflow Streaming Engine.
Why this is correct
Streaming Engine offloads state management to the backend, improving reliability.
- ✓
Enable exactly-once processing sinks (e.g., BigQuery with guaranteed row-level insertion).
Why this is correct
Exactly-once processing prevents duplicate data.
- ✗
Disable autoscaling to prevent worker churn.
Why it's wrong here
Autoscaling helps handle load spikes; disabling it can cause failures under load.
- ✗
Use micro-batch processing with a small batch size.
Why it's wrong here
Small batches increase overhead and may not improve reliability.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.