Q11. Explain how the Kubernetes control plane components work together.
The control plane maintains desired state and schedules workloads. - kube-apiserver: the front door. It validates and persists objects to etcd, and all components talk to...
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Q12. How do you design a multi-region failover architecture on AWS?
Design around an RTO and RPO first; they determine active-active versus active-passive. - DNS and traffic: Route 53 health checks with failover or latency routing, plus G...
Q13. When would you use Rc, Arc, RefCell or Mutex?
Ownership allows one owner, but graphs and shared state need more. Rust pushes the choice into types. - `Rc`: single-threaded reference counting. `clone` increments a cou...
Q14. What is the medallion architecture?
The medallion architecture organizes a lakehouse into three refinement layers. - Bronze (raw): data landed as-is from sources, append-only, with ingestion metadata. It is...
Q15. When is REST the wrong choice, and what would you use instead?
REST excels at resource-oriented CRUD with cacheable, uniform interfaces and a broad tool ecosystem. It becomes awkward when: - The domain is action-oriented or RPC-like,...
Q16. How would you design a multi-level caching architecture?
Layer caches by distance from the caller and accept that each layer adds staleness and invalidation complexity. Typical design: - Edge/CDN: cache public and static respon...