EMR Instance Fleets **mix On-Demand + Spot** across types and AZs. **Why:** Spot ~70% cheaper but interruptible; fleets diversify for reliability. **Logic:** Masters—On-Demand. Workers—Spot, capacity-optimized (availability over lowest price). **Trade-offs:** Lowest-price saves...
This hard-level General/Other question appears frequently in data engineering interviews at companies like Capco. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (optimization) will help you answer variations of this question confidently.
This is a senior-level question that tests architectural thinking. Lead with the high-level design, then drill into specifics. Discuss trade-offs explicitly - there is rarely one correct answer. Show awareness of scale, fault tolerance, and operational complexity.
EMR Instance Fleets mix On-Demand + Spot across types and AZs. Why: Spot ~70% cheaper but interruptible; fleets diversify for reliability. Logic: Masters—On-Demand. Workers—Spot, capacity-optimized (availability over lowest price). Trade-offs: Lowest-price saves more but increases interruptions. Cost: 80% Spot target ≈60% worker cost savings; Spot blocks for long jobs. Scalability: Multiple types (m5, m5a, m6i) across AZs grow pool. Monitor interruption metrics.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.