The answer is to reduce the buffer interval to 10 seconds and reduce the buffer size to 1 MB. Kinesis Data Firehose delivers data to S3 when either the buffer interval (time-based) or buffer size (size-based) threshold is met first; by lowering both, you force more frequent deliveries, directly reducing delivery latency. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding that Firehose latency is governed by these two independent triggers, and a common trap is assuming compression or format conversion (like Parquet or GZIP) reduces latency when they actually add processing overhead. Remember the key insight: to minimize latency, you shrink both the time window and the data volume threshold. A useful memory tip is "Smaller and Sooner"—smaller buffer size and sooner interval mean faster delivery.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 Amazon Kinesis Data Firehose to deliver streaming data to Amazon S3. The data is in JSON format, and each record is approximately 5 KB. The company has set the buffer interval to 60 seconds and the buffer size to 5 MB. However, the data engineer observes that the delivery to S3 is delayed by up to 5 minutes during peak traffic. The engineer wants to reduce the delivery latency to under 1 minute. Which TWO actions should the engineer take? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reduce the buffer size to 1 MB.
Option A is correct because reducing the buffer interval to 10 seconds forces Firehose to deliver data more frequently, reducing latency. Option C is correct because reducing the buffer size to 1 MB also triggers delivery sooner when the size threshold is met. Option B is wrong because increasing the buffer size would increase latency, as it takes longer to fill. Option D is wrong because converting to Parquet requires additional processing and does not directly reduce latency; it may increase it. Option E is wrong because enabling GZIP compression reduces volume but does not reduce delivery latency; it may actually increase processing time.
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.
✗
Enable GZIP compression for the delivery stream.
Why it's wrong here
Compression reduces storage size but does not reduce delivery latency.
✓
Reduce the buffer size to 1 MB.
Why this is correct
A smaller buffer size triggers delivery sooner when the size threshold is reached.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the buffer size to 50 MB.
Why it's wrong here
Increasing buffer size delays delivery because it takes longer to fill.
✗
Convert the data format to Apache Parquet before delivery.
Why it's wrong here
Conversion adds processing time and does not reduce delivery latency.
✓
Reduce the buffer interval to 10 seconds.
Why this is correct
A shorter interval triggers more frequent delivery, reducing latency.
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 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 Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Reduce the buffer size to 1 MB. — Option A is correct because reducing the buffer interval to 10 seconds forces Firehose to deliver data more frequently, reducing latency. Option C is correct because reducing the buffer size to 1 MB also triggers delivery sooner when the size threshold is met. Option B is wrong because increasing the buffer size would increase latency, as it takes longer to fill. Option D is wrong because converting to Parquet requires additional processing and does not directly reduce latency; it may increase it. Option E is wrong because enabling GZIP compression reduces volume but does not reduce delivery latency; it may actually increase processing time.
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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