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What role does the Instance Fleet configuration play in cost optimization?

General/Otherhard0.3 min readPremium
Frequency
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Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Capco
Key Concepts Tested
optimization
Expert AnswerPremium
62 wordsInterview-ready
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....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Capco. The answer also includes follow-up discussion points that interviewers commonly explore.

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