The answer is to set the buffer interval to 60 seconds and enable dynamic partitioning. This configuration directly meets the requirement for Kinesis Firehose delivery latency under 60 seconds by forcing a flush every 60 seconds regardless of data volume, while dynamic partitioning automatically organizes the incoming clickstream data into S3 prefixes by year, month, day, and hour without needing a separate transformation step. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your understanding of Firehose’s buffer settings versus its partitioning capabilities—a common trap is choosing a buffer size like 1 MB, which would create excessive small files during unpredictable bursts, or adding a Lambda transformation that introduces unnecessary latency. Remember the key trade-off: buffer interval controls delivery time, while dynamic partitioning handles folder structure without extra compute. A useful memory tip is “Time triggers delivery, partitioning triggers folders”—if you need low latency, always set the buffer interval, not the buffer size.
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An e-commerce company uses Amazon Kinesis Data Firehose to deliver clickstream data to Amazon S3. The data arrives at unpredictable rates, with occasional bursts. The company needs to ensure data is delivered within 60 seconds of ingestion, and the data must be partitioned by year/month/day/hour. Which configuration meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the buffer interval to 60 seconds and enable dynamic partitioning
Setting the buffer interval to 60 seconds and enabling dynamic partitioning ensures data is delivered within 60 seconds and automatically partitioned by time. Option B (buffer size 1 MB) would cause excessive small files. Option C (Lambda transformation) adds latency. Option D (Glue streaming) is not directly integrated with Firehose.
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.
✗
Set the buffer size to 1 MB and disable dynamic partitioning
Why it's wrong here
1 MB buffer may cause many small files; no partitioning.
✗
Use a Lambda function to process data and write to S3 with partitioning
Why it's wrong here
Adds latency and complexity; Firehose can do this natively.
✗
Use AWS Glue streaming ETL to read from Firehose and write to S3
Why it's wrong here
Unnecessary intermediate step; Firehose delivers directly to S3.
✓
Set the buffer interval to 60 seconds and enable dynamic partitioning
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.
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: Set the buffer interval to 60 seconds and enable dynamic partitioning — Setting the buffer interval to 60 seconds and enabling dynamic partitioning ensures data is delivered within 60 seconds and automatically partitioned by time. Option B (buffer size 1 MB) would cause excessive small files. Option C (Lambda transformation) adds latency. Option D (Glue streaming) is not directly integrated with Firehose.
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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