The correct answer is to increase the Lambda function timeout setting. When a Kinesis Data Firehose delivery stream invokes a Lambda transformation function, the function must complete its processing within the configured timeout; if the data payload is large or the transformation logic is slow, the default 3-second timeout is often exceeded, causing the stream to fail delivery to S3. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how Lambda integration works with Firehose—specifically that the stream’s buffer settings and Lambda’s execution limits are independent, so you must adjust the Lambda timeout directly rather than tweaking the stream’s buffer interval or memory. A common trap is confusing memory exhaustion with timeout errors; CloudWatch logs will explicitly show “Task timed out” for timeout issues, not out-of-memory errors. Remember the mnemonic: “Timeout? Tune the Timeout, not the Stream.”
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. 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 data engineer is troubleshooting a Kinesis Data Firehose delivery stream that is failing to deliver data to an Amazon S3 bucket. The stream is configured with a Lambda transformation function. The CloudWatch logs show that the Lambda function is timing out. Which action should the engineer take to resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the Lambda function timeout setting.
Option C is correct because increasing the Lambda timeout allows the function to complete processing. Option A is wrong because the issue is timeout, not memory. Option B is wrong because the stream configuration does not control Lambda timeout. Option D is wrong because reducing the buffer interval may increase invocation frequency but not fix the timeout.
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.
✗
Reduce the Firehose buffer interval.
Why it's wrong here
Reducing buffer interval may cause more small batches but does not fix timeout.
✓
Increase the Lambda function timeout setting.
Why this is correct
Extending timeout allows more time for processing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Decrease the Lambda function's batch size in Firehose.
Why it's wrong here
Batch size is controlled by Firehose, not Lambda configuration.
✗
Increase the memory allocated to the Lambda function.
Why it's wrong here
Timeout is a duration issue, not memory.
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 DEA-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 Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the Lambda function timeout setting. — Option C is correct because increasing the Lambda timeout allows the function to complete processing. Option A is wrong because the issue is timeout, not memory. Option B is wrong because the stream configuration does not control Lambda timeout. Option D is wrong because reducing the buffer interval may increase invocation frequency but not fix the timeout.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-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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