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Quiz

2627 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2627 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture77 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture85 Cost Architecture & FinOps82 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization82 AI-Era Architecture86 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture88 Streaming & Real-Time Data93 Data Governance & Semantics81 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk88
Difficulty Any beginner intermediate advanced

6 questions in Leader Election.

  1. Leader Election advanced

    A leader-based coordination service loses contact with its followers while the leader itself remains healthy and continues serving. What failure modes emerge, and what prevents split-brain?

    2 min answer polygonleader-electionsplit-brainquorum
  2. Leader Election advanced

    A leader-based database cluster loses network connectivity between the leader and its followers, but the leader is still running and still accepting writes from application servers that can reach it. What happens, and how does correct leader election prevent it?

    3 min answer leader-electionsplit-brainquorumfencing
  3. Leader Election advanced

    A nightly job occasionally runs twice, producing duplicate charges. The team proposes a distributed lock. What do you say?

    2 min answer leader-electionlockingidempotencyfencing
  4. Leader Election advanced

    A team designs active-active across two regions with automatic failover based on health checks. What is wrong?

    2 min answer split-brainquorummulti-region
  5. Leader Election advanced

    Your cluster fails over spuriously under load, but a real leader failure takes 45 seconds to detect. How do you resolve the tension?

    2 min answer leader-electionfailoverdetectiontuning
  6. Leader Election intermediate Multiple choice

    Your company runs two data centres and wants automatic database failover between them. What is missing?

    2 min answer quorumsplit-brainmulti-regiondesign