Easy Learn
A complete, ground-up tutorial on RTO (Recovery Time Objective) in disaster recovery: introduction and a six-step history from 1970s tape backups through 2020s ransomware and automated recovery, the problem and motivation of an undefined RTO, seven core concepts (DR, RTO, RPO, MTD, WRT, failover / failback, hot / warm /…
A complete, plain-language guide to RPO (Recovery Point Objective) in disaster recovery: introduction and a little history, the problem and motivation (the window of vulnerability between data creation and the safe copy), the video-game save-point analogy, eight core-concept definitions (RPO, RTO, backup, replication, data loss window, snapshot, checkpoint, change data…
A complete, ground-up tutorial on rate limiters: introduction and history (from 1970s telephone traffic shaping through the modern era of adaptive, AI-aware limits), problem and motivation (one buggy script can pile up 50,000 requests per second), seven core-concept definitions (rate limiter, throttling, quota, burst, client identification, HTTP 429, API key),…
A complete, plain-language guide to rate limiters: introduction and a little history, the problem and motivation (accidental overload, brute-force attacks, denial-of-service floods), the nightclub-bouncer analogy, basic terminology, what a rate limiter really is, the six concrete reasons systems need one (protecting against overload, ensuring fairness, defending against attacks, controlling costs,…
A complete, plain-language guide to the circuit breaker pattern: an introduction and a little history, the problem and motivation (cascading failure), the electrical-breaker analogy, basic terminology, the core concept, the three states (closed, open, half-open) with a full state-transition diagram, architecture and components, internal working and state transitions, request lifecycle…
A plain-language, complete guide to horizontal scaling: what it really means (scaling out with nodes), a little history of why the idea even exists, the difference between scalability and elasticity, a side-by-side comparison with vertical scaling, how it actually works with load balancers and auto-scaling, the hidden challenge of state…
A plain-language, complete guide to vertical scaling: what it really is, a short history of scaling up from early room-sized computers to modern cloud instances, how it actually works today, what you can actually upgrade (CPU, RAM, storage, network), the warning signs that tell a system it needs to scale,…
A plain-language, complete guide to why horizontal scaling has become the default for large systems: the big idea, a quick recap of vertical vs horizontal, a short history of how we got here, and seven concrete reasons the world’s busiest systems keep choosing to grow sideways rather than upward (the…
A plain-language, complete guide to stateless services: what they really are, a short history from HTTP’s early days to modern cloud computing, what “state” actually means (session, application, connection, persistent), how a stateless request-response cycle works, the differences between cookies, server sessions, and JWT tokens, a side-by-side comparison of stateless…
A plain-language, complete guide to caching in software design: what caching really is, a short history of the idea from 1960s hardware caches to modern CDNs, how it actually works (hits, misses, hit rate, cold starts), the four main types of caches (application, distributed, global, CDN/edge), the four main read/write…