MLS-C01 Practice Question: Machine Learning Implementation and Operations
Exhibit
Refer to the exhibit. 2023-01-15 10:30:00 ERROR - Model server did not start within 300 seconds. 2023-01-15 10:30:00 ERROR - No worker process responded to ping. 2023-01-15 10:30:00 INFO - Starting model server... 2023-01-15 10:29:55 INFO - Loading model from /opt/ml/model
A SageMaker endpoint creation fails with the above CloudWatch Logs excerpt. What is the MOST likely cause?
⚠ Common exam trap
The MLS-C01 exam often tests the distinction between timeout errors (which indicate slow download/extraction) and permission errors (which indicate access issues), leading candidates to incorrectly blame S3 permissions when the actual cause is a timeout.
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 model file is too large and takes longer than 300 seconds to load
The CloudWatch Logs excerpt shows a timeout error during model loading. SageMaker has a default 300-second timeout for downloading and loading model artifacts from S3 into the inference container. If the model file is too large or the network is slow, the container fails to start within this window, causing the endpoint creation to fail with a timeout error.
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 S3 bucket containing the model artifacts has incorrect permissions
Why it's wrong here
Permission errors appear during download, not during loading.
- ✗
The inference script has a syntax error
Why it's wrong here
A syntax error would appear in the logs, not a timeout.
- ✗
The instance type does not have enough memory to load the model
Why it's wrong here
Insufficient memory would cause an out-of-memory error, not a timeout.
- ✓
The model file is too large and takes longer than 300 seconds to load
Why this is correct
The timeout indicates the model loading exceeds the default 300 seconds.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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