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Lessons (15)

• Timeouts, Retries & Backpressure

  … Do not give every hop its own 1,000 ms timeout. Step Budget When it expires --- ---: --- Gateway/app …

• Resilience Patterns

  … AbortSignal.timeout(2000), // give up after 2 s }); 💡 Base timeouts on the dependency's p99 latency plus a …

• Creational Patterns: How to Make Objects

  … readable, step by step, with defaults class RequestBuilder { config = { method: "GET", headers: {}, timeout: 10 000, retries: 0 }; url …

• Exactly-Once Payment Processing

  … Never blindly re-charge after a timeout. Store UNKNOWN , query the provider, and reconcile in a worker. Watch …

• Design a Ride-Sharing Service

  … Match nearby candidates, then atomically lease one driver; release/retry on rejection or timeout. Locations are eventually consistent …

• Distributed Coordination: Consensus, Heartbeats and Gossip

  … Majority agreement Is a node probably alive? Heartbeat + timeout Suspicion, not certainty Spread membership at scale Gossip Eventual …

• Service Communication: Sync vs Async

  … queues. Keeping sync calls safe - ⏱️ Always set timeouts. No timeout = one slow service can exhaust every thread. - 🔁 Retry …

• API Gateway, BFF & Service Discovery

  … networking as infrastructure As services multiply, every one needs retries, timeouts, mutual TLS, metrics and tracing. Instead of …

• The L6 System-Design Thinking Loop

  … Walk one crash, timeout, or retry. 5. Explain metrics, mitigation, and the durable fix. 💡 A good trade-off …

• Scaling, Load Balancing & Rate Limiting

  … Design for it: Pattern Purpose --- --- Timeouts Never wait forever on a dependency Retries with exponential backoff + jitter Survive …

• How a Web Request Works

  … Error, 502 Bad Gateway, 503 Unavailable, 504 Gateway Timeout 5. Your server code Inside the server, a request …

• Monolith vs Microservices

  … function call that becomes a network call needs timeouts, retries, idempotency, authentication, monitoring and versioning. The middle path …

• Consumers & Consumer Groups

  … considered dead if it misses heartbeats for session.timeout.ms , or doesn't call poll within max.poll …

• Microkernel (Plugin) Architecture

  … catch plug-in errors, timeouts One bad plug-in shouldn't crash the host Isolate security where plug …

• Deploying & Operating Microservices

  … should have: - [ ] Health endpoints ( /health/live , /health/ready ) - [ ] Timeouts, retries with backoff, and circuit breakers on outgoing calls …