resilience-and-reliability-engineering-p-module

circuit breakerpattern preventing cascading failures by stopping calls to failing service; trips open on threshold violations

blue green deploymentparallel environments with instant traffic switch; enables instant rollback on failure

cache invalidationremoving stale cached entries; must be timely to prevent serving incorrect data

failoverautomatic transfer of operations to redundant system when primary system fails; maintains continuity

failure isolationA resilience strategy that prevents failures in one component or subsystem from propagating to other component

high availabilitysystem design ensuring uptime above 99.9% through redundancy, failover, and elimination of single_points_of_fa

active active failovermultiple nodes serve traffic simultaneously; load balanced with automatic failover on loss

active passive failoverstandby passive node takes over only upon primary failure; waste of capacity but simple

alert fatiguedesensitization from excessive alerts; leads to missed critical notifications

anti affinityscheduling constraint preventing pods from same service on same node; improves failure isolation

backpressuresignaling upstream to slow production when downstream cannot keep pace; prevents buffer overflow

blameless cultureorganizational norm where individuals report failures without fear of punishment; enables learning

bulkheadisolation pattern limiting failure blast radius; partitions resources so one failure cannot exhaust all

cache asideapplication checks cache first, loads from db on miss, populates cache; most common pattern

cache stampedeconcurrent cache misses causing thundering herd on backend; mitigated by probabilistic early expiration

canary deploymentgradual traffic shift to new version; small percentage first, monitor, then complete rollout

cap theoremimpossibility guarantee that distributed system cannot simultaneously provide consistency, availability, and p

capacity planningprojecting resource needs based on growth and utilization trends; prevents exhaustion failures

cascading failurefailure propagation from one component to others; circuit breakers and bulkheads prevent this

chaos engineeringdeliberate injection of failures into production to discover weaknesses before they cause outages