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2948 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 areas2948 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking96 API & Integration Architecture87 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture105 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization102 AI-Era Architecture106 Software Architecture & Engineering93 Architecture Patterns94 Architecture Decision-Making101 The Architect's Meta-Skills102 Delivery & Release Engineering103 Platform Engineering & Developer Experience102 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data103 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

5 questions in Stateful Stream Processing.

  1. Stateful Stream Processing advanced

    A stateful stream processor's state grows continuously and recovery takes hours. What design changes address this?

    2 min answer statecheckpointingrecoveryttl
  2. Stateful Stream Processing advanced

    A stream processing job has run fine for four months. It now fails with out-of-memory errors every few hours. No code has changed. Diagnose.

    2 min answer streamingstatettlcapacity
  3. Stateful Stream Processing advanced

    A stream processing job has run for four months and now fails with out-of-memory errors every few hours. No code has changed. Diagnose.

    2 min answer streamingstateoperations
  4. Stateful Stream Processing advanced

    A stream processor maintains per-vehicle state across events. What does that require operationally, and where does it break?

    2 min answer porterstatecheckpointingrebalancing
  5. Stateful Stream Processing advanced

    A windowed job writes one row per hour into a reporting table. Overnight the autoscaler kills a task manager twice - at 03:14 and at 05:40 - and each time the job restores from a checkpoint taken about two minutes earlier and resumes with no errors. Next morning 2 of the 24 hourly rows are roughly double. Every checkpoint in the window completed successfully. What failed?

    3 min answer checkpointingtimersidempotent-sinkduplicates