Question 1,251 of 1,711
DEA-C01 Data Store Management Practice Question
A data engineering team is using Amazon EMR to process large datasets stored in Amazon S3. The cluster uses Spot Instances for cost savings. During processing, the team notices that tasks are failing due to Spot Instance interruptions. The team needs to make the EMR job resilient to Spot interruptions without increasing costs significantly. Which solution should they implement?
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 EMR instance fleets with a mix of Spot and On-Demand, setting the allocation strategy to 'diversified' and using On-Demand for core nodes.
Using EMR instance fleets with a mix of Spot and On-Demand, setting the allocation strategy to 'diversified', and using On-Demand for core nodes ensures resilience to Spot interruptions without significant cost increase. On-Demand core nodes provide stability for HDFS and critical processing, while diversified allocation for Spot task nodes reduces the risk of simultaneous interruptions. Option A is incorrect because the 'lowest price' allocation strategy prioritizes the cheapest Spot instances, which often have higher interruption rates, and does not protect core nodes. Option B is incorrect because increasing core nodes with On-Demand instances raises costs significantly. Option C is incorrect because using only Spot Instances with automatic termination and checkpointing does not prevent job failures during interruptions; automatic termination would terminate the job, and checkpointing only helps with recovery, not resilience.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use EMR instance fleets with a mix of Spot and On-Demand, but set the allocation strategy to 'lowest price'.
Why it's wrong here
Lowest price may lead to more interruptions.
- ✗
Increase the number of core nodes using On-Demand instances.
Why it's wrong here
Increases cost.
- ✗
Use only Spot Instances but enable automatic termination and checkpointing.
Why it's wrong here
Still vulnerable to interruptions.
- ✓
Use EMR instance fleets with a mix of Spot and On-Demand, setting the allocation strategy to 'diversified' and using On-Demand for core nodes.
Why this is correct
Diversified spreads risk; On-Demand core ensures stability.
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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Last reviewed: Jun 20, 2026
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