Module 9
Build systems that survive failures: circuit breakers, bulkheads, retries, throttling, and queue-based load leveling for graceful degradation.
Prevent cascade failures: closed, open, and half-open states. Trip thresholds, recovery strategies, and monitoring circuit breaker health.
Isolate components to contain failures: thread pool isolation, connection pool partitioning, and service-level bulkheads in microservices.
Smart retry strategies: exponential backoff, jitter, max retries, idempotency requirements, and when NOT to retry.
Prevent indefinite waiting: connection timeouts, read timeouts, cascading timeout budgets, and combining timeouts with circuit breakers.
Control resource consumption: token bucket, leaky bucket, fixed window, sliding window algorithms. Client-side vs server-side throttling.
Use queues as buffers between producers and consumers: absorbing traffic spikes, backpressure, and maintaining consistent processing rates.
Scale message processing horizontally: multiple consumers on a single queue, message visibility, ordering guarantees, and partition-based parallelism.
Process high-priority messages first: priority lanes, separate queues per priority, and ensuring low-priority messages don't starve.
Expose health checks for load balancers and orchestrators: liveness vs readiness probes, deep health checks, and dependency monitoring.