The answer is a file descriptor leak in the inference code. This is the most likely cause of SageMaker endpoint health check failures because the error message "Too many open files" directly indicates that the inference container has exhausted its available file descriptors, preventing it from opening new connections or files required for health check responses. On the AWS Certified Machine Learning Engineer Associate MLA-C01 exam, this scenario tests your understanding of how operating system resource limits manifest in SageMaker container logs, often appearing as a subtle trap where candidates mistakenly attribute the failure to memory errors, network timeouts, or incorrect port configurations. A key distinction is that a file descriptor leak will show a rising count of open files in the container metrics before the endpoint fails, whereas memory leaks produce OOM errors and network issues generate connection timeouts. Remember the mnemonic "FD for FD" — File Descriptor errors mean the code is forgetting to close Files and Descriptors.
MLA-C01 Practice Question: ML Solution Monitoring, Maintenance and Security
This MLA-C01 practice question tests your understanding of ml solution monitoring, maintenance and security. 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
[2024-01-15 10:23:45.123] [ERROR] [ContainerHealthCheck]
Health check failed: Error: Unable to connect to endpoint.
[2024-01-15 10:23:45.456] [INFO] [ModelServer]
Starting model server...
[2024-01-15 10:23:50.789] [ERROR] [ModelServer]
Model server failed to start: OSError: [Errno 24] Too many open files
Refer to the exhibit. A SageMaker endpoint is failing health checks. 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.
[2024-01-15 10:23:45.123] [ERROR] [ContainerHealthCheck]
Health check failed: Error: Unable to connect to endpoint.
[2024-01-15 10:23:45.456] [INFO] [ModelServer]
Starting model server...
[2024-01-15 10:23:50.789] [ERROR] [ModelServer]
Model server failed to start: OSError: [Errno 24] Too many open files
A
The endpoint is not correctly configured with VPC settings.
Why wrong: VPC misconfiguration would cause network connectivity errors, not 'Too many open files'.
B
The model is too large for the instance memory.
Why wrong: Memory issues would produce out-of-memory errors, not file descriptor errors.
C
The inference code has a file descriptor leak.
The error explicitly indicates too many open files, which is a classic symptom of a file descriptor leak.
D
The model server is using an incorrect port.
Why wrong: Incorrect port would cause connection refused errors, not file descriptor exhaustion.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The inference code has a file descriptor leak.
Option C is correct because the error 'Too many open files' indicates a file descriptor leak in the inference code. Option A would show memory errors. Option B would show network errors. Option D would show incorrect port errors.
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 endpoint is not correctly configured with VPC settings.
Why it's wrong here
VPC misconfiguration would cause network connectivity errors, not 'Too many open files'.
✗
The model is too large for the instance memory.
Why it's wrong here
Memory issues would produce out-of-memory errors, not file descriptor errors.
✓
The inference code has a file descriptor leak.
Why this is correct
The error explicitly indicates too many open files, which is a classic symptom of a file descriptor leak.
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 model server is using an incorrect port.
Why it's wrong here
Incorrect port would cause connection refused errors, not file descriptor exhaustion.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which MLA-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.
ML Solution Monitoring, Maintenance and Security — This question tests ML Solution Monitoring, Maintenance and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The inference code has a file descriptor leak. — Option C is correct because the error 'Too many open files' indicates a file descriptor leak in the inference code. Option A would show memory errors. Option B would show network errors. Option D would show incorrect port errors.
What should I do if I get this MLA-C01 question wrong?
Identify which MLA-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.
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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