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Data Engineering →hardMultiple ChoiceObjective-mapped

MLS-C01 Lambda Timeout 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. A key principle to apply: lambda Timeout. 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.

Exhibit

Refer to the exhibit.

```
{
    "Records": [
        {
            "eventVersion": "2.1",
            "eventSource": "aws:s3",
            "awsRegion": "us-east-1",
            "eventName": "ObjectCreated:Put",
            "s3": {
                "s3SchemaVersion": "1.0",
                "bucket": {
                    "name": "my-data-lake",
                    "arn": "arn:aws:s3:::my-data-lake"
                },
                "object": {
                    "key": "data/2023/01/15/sample.json",
                    "size": 1024,
                    "eTag": "abc123"
                }
            }
        }
    ]
}
```

An S3 event notification triggers an AWS Lambda function when a new object is created. The Lambda function parses the event and processes the object. The function is failing with a timeout error for large objects. Which approach should be used to handle large objects efficiently?

Exhibit

Refer to the exhibit.

```
{
    "Records": [
        {
            "eventVersion": "2.1",
            "eventSource": "aws:s3",
            "awsRegion": "us-east-1",
            "eventName": "ObjectCreated:Put",
            "s3": {
                "s3SchemaVersion": "1.0",
                "bucket": {
                    "name": "my-data-lake",
                    "arn": "arn:aws:s3:::my-data-lake"
                },
                "object": {
                    "key": "data/2023/01/15/sample.json",
                    "size": 1024,
                    "eTag": "abc123"
                }
            }
        }
    ]
}
```

Answer choices

Why each option matters

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 to 15 minutes

Increasing the Lambda function timeout to the maximum of 15 minutes directly addresses the timeout error for large objects. This allows the function to complete processing within the allotted time. Option B (SQS queue) does not solve the timeout issue because the processing time itself is too long; buffering events does not reduce processing time. Option C (Kinesis) adds unnecessary streaming complexity. Option D (Step Functions) adds orchestration overhead without addressing the timeout.

Key principle: Lambda Timeout

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 timeout to 15 minutes

    Why this is correct

    Increasing the Lambda timeout is the direct solution to timeout errors. Lambda allows a maximum timeout of 15 minutes, which can accommodate processing of larger objects.

    Related concept

    Lambda Timeout

  • ✗

    Use an SQS queue to buffer event notifications and configure Lambda with a batch window

    Why it's wrong here

    Using an SQS queue to buffer events does not reduce the processing time of the Lambda function. The timeout error occurs because the processing takes too long, not because events arrive too quickly.

  • ✗

    Stream events to Amazon Kinesis Data Streams and process with Lambda

    Why it's wrong here

    Kinesis Data Streams are used for real-time streaming data and do not solve the Lambda timeout issue for large object processing.

  • ✗

    Use AWS Step Functions to orchestrate the processing

    Why it's wrong here

    Step Functions add orchestration but do not directly increase the processing time limit; the Lambda function would still time out.

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

Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.

KKey Concepts to Remember

  • Lambda Timeout
  • S3 Event Notifications

TExam Day Tips

  • 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

Lambda Timeout

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.

Quick reference

AWS S3 Storage Class Comparison

Storage ClassMin DurationRetrievalUse Case
S3 StandardNoneImmediateFrequently accessed data
S3 Standard-IA30 daysImmediateInfrequent access, rapid retrieval
S3 One Zone-IA30 daysImmediateNon-critical infrequent data
S3 Intelligent-TieringNoneImmediate–hoursUnknown or changing access patterns
S3 Glacier Instant90 daysMillisecondsArchive with instant retrieval
S3 Glacier Flexible90 daysMinutes–hoursArchive, flexible retrieval
S3 Glacier Deep Archive180 daysHoursLong-term compliance archive

What to study next

Got this wrong? Here's your next step.

Review lambda Timeout, then practise related MLS-C01 questions on the same topic to reinforce the concept.

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FAQ

Questions learners often ask

What does this MLS-C01 question test?

Data Engineering — This question tests Data Engineering — Lambda Timeout.

What is the correct answer to this question?

The correct answer is: Increase the Lambda function timeout to 15 minutes — Increasing the Lambda function timeout to the maximum of 15 minutes directly addresses the timeout error for large objects. This allows the function to complete processing within the allotted time. Option B (SQS queue) does not solve the timeout issue because the processing time itself is too long; buffering events does not reduce processing time. Option C (Kinesis) adds unnecessary streaming complexity. Option D (Step Functions) adds orchestration overhead without addressing the timeout.

What should I do if I get this MLS-C01 question wrong?

Review lambda Timeout, then practise related MLS-C01 questions on the same topic to reinforce the concept.

What is the key concept behind this question?

Lambda Timeout

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Last reviewed: Jun 20, 2026

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This MLS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MLS-C01 exam.