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Data Engineering →hardMultiple ChoiceObjective-mapped

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.

Exhibit

Refer to the exhibit.

```yaml
Resources:
  GlueJob:
    Type: AWS::Glue::Job
    Properties:
      Command:
        Name: glueetl
        ScriptLocation: s3://my-bucket/scripts/etl.py
        PythonVersion: 3
      Role: arn:aws:iam::123456789012:role/GlueServiceRole
      MaxRetries: 0
      Timeout: 60
      NumberOfWorkers: 10
      WorkerType: G.1X
```

A data engineer created a CloudFormation template for a Glue ETL job as shown. The job processes 500 GB of data and takes 90 minutes to complete. However, the job fails after 60 minutes. What is the MOST likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Exhibit

Refer to the exhibit.

```yaml
Resources:
  GlueJob:
    Type: AWS::Glue::Job
    Properties:
      Command:
        Name: glueetl
        ScriptLocation: s3://my-bucket/scripts/etl.py
        PythonVersion: 3
      Role: arn:aws:iam::123456789012:role/GlueServiceRole
      MaxRetries: 0
      Timeout: 60
      NumberOfWorkers: 10
      WorkerType: G.1X
```

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

✓

The Timeout property is set to 60 minutes, but the job requires more time.

The Glue ETL job has a `Timeout` property set to 60 minutes, but the job requires 90 minutes to complete. When the timeout is reached, AWS Glue forcibly terminates the job, causing it to fail. This is the most direct cause of the failure after exactly 60 minutes of execution.

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.

  • ✗

    The IAM role does not have sufficient permissions.

    Why it's wrong here

    Permission issues would cause immediate failure, not after 60 minutes.

  • ✗

    The ScriptLocation S3 bucket is in a different region.

    Why it's wrong here

    If the bucket were in a different region, the job would fail immediately, not after 60 minutes.

  • ✓

    The Timeout property is set to 60 minutes, but the job requires more time.

    Why this is correct

    The job is killed when it exceeds the timeout, causing failure.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The MaxRetries property is set to 0, so the job does not retry on failure.

    Why it's wrong here

    MaxRetries affects retry behavior, but the job fails due to timeout, not a transient error.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse the `Timeout` property with the `MaxRetries` property, assuming that a job failing after a specific duration must be due to a retry limit rather than a timeout limit, or they overlook the exact 60-minute failure point as a clear indicator of a timeout being reached.

Detailed technical explanation

How to think about this question

The `Timeout` property in AWS Glue jobs defines the maximum time in minutes that a job run can consume before being automatically terminated. This is a hard limit; once reached, Glue sends a SIGTERM to the Spark application and marks the job as failed with a 'TIMEOUT' status. In contrast, the `MaxRetries` property controls how many times AWS Glue automatically retries a failed job run, but it does not affect the timeout threshold. The job's actual runtime of 90 minutes exceeds the configured 60-minute timeout, leading to termination at the 60-minute mark.

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.

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

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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this MLS-C01 question test?

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: The Timeout property is set to 60 minutes, but the job requires more time. — The Glue ETL job has a `Timeout` property set to 60 minutes, but the job requires 90 minutes to complete. When the timeout is reached, AWS Glue forcibly terminates the job, causing it to fail. This is the most direct cause of the failure after exactly 60 minutes of execution.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 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.