The answer is to configure an S3 event notification to invoke a Lambda function that starts the training job, or to use an EventBridge rule triggered by a custom event. Both approaches are correct because they provide event-driven triggers for SageMaker training jobs on new S3 data, eliminating the need for a fixed schedule. S3 event notifications can directly invoke a Lambda function, which then calls the SageMaker CreateTrainingJob API, while EventBridge can listen for custom application events or S3 object-level events to launch the training pipeline. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your understanding of serverless event-driven architectures and the integration boundaries of AWS services—a common trap is confusing CloudWatch Logs (for monitoring) with event sources, or assuming SQS can directly trigger SageMaker. Remember the key integration rule: S3 events and EventBridge are the two native triggers for starting SageMaker jobs; think “S3 to Lambda, or EventBridge to SageMaker” as your memory hook.
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses SageMaker to run training jobs on a schedule. The training data is stored in an S3 bucket that receives new data every hour. Which TWO approaches can the company use to trigger a training job when new data arrives?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up an Amazon EventBridge rule that triggers on S3 Object Created events and targets a Lambda function
Options B and D are correct. Option B: S3 events can invoke Lambda to start training. Option D: EventBridge rule can trigger on custom events. Option A is wrong because CloudWatch Logs are for logs, not events. Option C is wrong because SQS is not directly integrated with SageMaker. Option E is wrong because Step Functions would need a trigger.
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.
✗
Use an SQS queue to buffer S3 events and poll from a training instance
Why it's wrong here
SageMaker training jobs cannot poll SQS.
✓
Set up an Amazon EventBridge rule that triggers on S3 Object Created events and targets a Lambda function
Why this is correct
EventBridge can capture S3 events and invoke Lambda.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS Step Functions with a scheduled execution
Why it's wrong here
Scheduled, not event-driven.
✗
Use CloudWatch Logs to monitor S3 access logs and trigger a Lambda function
Why it's wrong here
Logs are not real-time triggers.
✓
Configure an S3 event notification to invoke a Lambda function that starts the training job
Why this is correct
S3 events can directly trigger Lambda.
Related concept
Read the scenario before looking for a memorised answer.
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 MLS-C01 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.
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up an Amazon EventBridge rule that triggers on S3 Object Created events and targets a Lambda function — Options B and D are correct. Option B: S3 events can invoke Lambda to start training. Option D: EventBridge rule can trigger on custom events. Option A is wrong because CloudWatch Logs are for logs, not events. Option C is wrong because SQS is not directly integrated with SageMaker. Option E is wrong because Step Functions would need a trigger.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-C01 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.
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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