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Lessons (15)

• Kubernetes Cluster Architecture

  … The control plane (API server, etcd, scheduler, controllers) and the worker nodes (kubelet, container runtime, kube-proxy), and …

• Pods

  … requests: guaranteed minimum, used for SCHEDULING cpu: "250m" 0.25 of a CPU core memory: "256Mi" limits: maximum …

• Design a Polite Web Crawler

  … normalize, deduplicate and schedule per host. ![Crawler: a URL frontier schedules polite fetches while deduplication and storage process …

• Heaps & Priority Queues

  … The engine behind "top K" problems, schedulers and Dijkstra. The big idea In a hospital emergency room, patients …

• Deployments, ReplicaSets & Rollouts

  … migrations, batch processing Retries until it succeeds CronJob Scheduled jobs: nightly reports, cleanups Creates Jobs on a cron …

• Scaling & Health Probes

  … When nodes are underused, it drains and removes them. mermaid sequenceDiagram participant HPA participant S as Scheduler participant …

• Debug Latency Like an Investigator

  … subset. Every morning Batch reports, backup, cache expiry, scheduled work. Restart helps briefly Warm cache, leak, churn, periodic …

• Stacks & Queues

  … Two simple structures behind undo buttons, browser history, task scheduling and many interview problems. The big idea ![A …

• Why Kubernetes?

  … rollback "Which server has space?" Spreadsheets and guesswork Scheduler places containers by CPU/memory needs Service A needs …

• Serverless Architecture

  … JSON.stringify(result) }; }; When to use it ✅ Spiky or unpredictable traffic, event processing (uploads, queues, webhooks), scheduled jobs …

• Data in Microservices: Sagas & the Outbox Pattern

  … Release stock 3 Charge card Refund card 4 Schedule shipment (last step: nothing after it can fail) ⚠️ Compensation …

• Linked Lists

  … linked list + hash map), undo stacks, OS task scheduling. Technique 1: Traverse js function toArray(head) { const values …

• Backend Languages: Node.js, Go, Python & Rust

  … thousands of goroutines"] S{{Go scheduler}} -- G1[goroutine] & G2[goroutine] & G3[goroutine] & G4[goroutine …] S -- C1[CPU core …

• Frontend Performance & Core Web Vitals

  … tasks: yield to the browser between chunks ( await scheduler.yield() or setTimeout ). - Move heavy work off the main …

• Structural Patterns: How to Connect Objects

  … card, cart.total); const shipment = await this.shipping.schedule(cart.items, customer.address); await this.mailer.sendConfirmation(customer …