The correct answer is to use S3 Batch Operations with a Lambda function to process objects. This solution avoids Lambda timeout errors by decoupling the processing from the synchronous invocation triggered by S3 events; S3 Batch Operations invoke your Lambda function asynchronously for each object in a manifest, allowing the function to run up to 15 minutes per invocation rather than the standard 15-minute timeout, and it scales to handle large files without hitting execution limits. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your understanding of Lambda limitations and asynchronous processing patterns for data pipelines, often appearing as a trap where candidates mistakenly increase memory or timeout settings. The key insight is that Lambda’s maximum execution duration is fixed, so for large S3 files you need a batch-oriented approach. Memory tip: think “Batch to bypass the clock” — when files are too large for a single Lambda run, use S3 Batch Operations to process them asynchronously.
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. 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 uses AWS Lambda to process events from Amazon S3. The Lambda function transforms the data and writes results to another S3 bucket. Recently, the function has been failing due to timeout errors when processing large files. Which solution should the data engineer implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use S3 Batch Operations with a Lambda function to process objects
Using S3 Batch Operations with a Lambda function allows processing large numbers of objects asynchronously, avoiding Lambda timeouts. Option A is wrong because increasing memory also increases CPU but may not solve timeout for large files. Option B is wrong because SQS does not help with processing large files. Option D is wrong because increasing timeout may not be sufficient and is not best practice for large files.
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 Lambda function memory and timeout limit
Why it's wrong here
Lambda has a maximum timeout of 15 minutes; large files may still exceed.
✗
Increase the Lambda timeout to 15 minutes
Why it's wrong here
May not be enough for very large files and not a scalable solution.
✓
Use S3 Batch Operations with a Lambda function to process objects
Why this is correct
Batch Operations can invoke Lambda for each object, handling large volumes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Amazon SQS to queue the events and process them in batches
Why it's wrong here
SQS does not address the processing of large files within Lambda.
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.
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use S3 Batch Operations with a Lambda function to process objects — Using S3 Batch Operations with a Lambda function allows processing large numbers of objects asynchronously, avoiding Lambda timeouts. Option A is wrong because increasing memory also increases CPU but may not solve timeout for large files. Option B is wrong because SQS does not help with processing large files. Option D is wrong because increasing timeout may not be sufficient and is not best practice for large files.
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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