Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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 company runs a batch process every night that loads data into BigQuery. They want to ensure that if the job fails, it is retried automatically up to 3 times. Which configuration should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud Composer (Airflow) tasks with retries.
Option E is correct because Cloud Composer (Airflow) natively supports task-level retries via the `retries` parameter in task definitions, allowing you to specify up to 3 automatic retries on failure. This is the appropriate choice for orchestrating a batch process that loads data into BigQuery, as Airflow provides robust retry logic, dependency management, and monitoring for complex workflows.
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.
✗
Cloud Run jobs with --max-retries=3.
Why it's wrong here
Cloud Run jobs have retries but not directly for scheduled execution.
✗
Cloud Scheduler with retry policy.
Why it's wrong here
Cloud Scheduler triggers a job but does not retry on failure.
✗
BigQuery load job with maximum retries setting.
Why it's wrong here
BigQuery load jobs do not have a retry configuration.
✗
Cloud Functions with error handling.
Why it's wrong here
Cloud Functions can retry but not built-in for scheduled triggers.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between a simple retry mechanism (like Cloud Scheduler or Cloud Functions) and a full workflow orchestration tool (Cloud Composer) that can manage retries within a multi-step batch process, leading candidates to pick a simpler option that lacks the necessary pipeline control.
Detailed technical explanation
How to think about this question
In Apache Airflow, the `retries` parameter is set at the task level (e.g., `retries=3` in a PythonOperator or BigQueryInsertJobOperator), and each retry respects a configurable `retry_delay` (default 5 minutes) and exponential backoff via `max_retry_delay`. Under the hood, Airflow uses a database-backed scheduler to track task states and re-queues failed tasks up to the specified limit, which is critical for handling transient BigQuery errors like rate limiting or temporary quota exhaustion. In a real-world scenario, if a BigQuery load job fails due to a schema mismatch, Airflow can be configured to skip retries and alert, whereas for transient errors like `backendError`, retries with backoff often succeed.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Composer (Airflow) tasks with retries. — Option E is correct because Cloud Composer (Airflow) natively supports task-level retries via the `retries` parameter in task definitions, allowing you to specify up to 3 automatic retries on failure. This is the appropriate choice for orchestrating a batch process that loads data into BigQuery, as Airflow provides robust retry logic, dependency management, and monitoring for complex workflows.
What should I do if I get this PCA 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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