MLS-C01 Practice Question: Machine Learning Implementation and Operations
A media company uses SageMaker to train a recommendation model. The training data is stored in an S3 bucket with versioning enabled. The data pipeline updates the training data daily by overwriting objects with new data. Recently, the model's performance degraded, and the team suspects that the training data was corrupted on a specific day. They want to train the model using the data from a previous version. How can the team retrieve the previous version of the training data?
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
✓
Use the S3 GET Object Version API to download the specific version of each object.
S3 versioning allows retrieval of any previous version of an object by using the GET Object Version API with the specific version ID. Option A is incorrect because S3 Glacier is an archival storage class, not a feature for accessing previous versions of current objects. Option C is incorrect because S3 Select is used to query data within an object, not for version retrieval. Option D is incorrect because S3 replication copies objects to another bucket but does not provide access to previous versions in the source bucket.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Restore the bucket from S3 Glacier, which contains the previous version.
Why it's wrong here
S3 Glacier is for archival; versioning is managed separately.
- ✓
Use the S3 GET Object Version API to download the specific version of each object.
Why this is correct
S3 versioning stores multiple versions; GET Object with version ID retrieves the desired version.
- ✗
Use S3 Select to query the previous version of the data.
Why it's wrong here
S3 Select only queries the current version of an object.
- ✗
Enable S3 replication to a different bucket and use the replicated data.
Why it's wrong here
Replication copies current objects; it does not preserve previous versions unless versioning is enabled on the destination.
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 |
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