Fault Tolerance and Failure Scenarios Questions
Designing systems resilient to component failures: timeouts, retries with exponential backoff, circuit breakers, bulkheads. Discuss cascading failure prevention and graceful degradation. At Staff level, demonstrate thinking about multi-layer failures (service failures, database failures, network partitions) and how to detect and recover from them.
HardTechnical
68 practiced
Design a recovery and reconciliation algorithm for an eventually-consistent distributed cache that may serve stale reads after failover. The solution should limit load on the origin store during cache warm-up, prioritize critical keys, and converge to the latest state without overwhelming downstream services or showing duplicate/inconsistent results to users.
MediumTechnical
83 practiced
Outline a CI/CD test plan for verifying fault tolerance features such as timeouts, retries, circuit breakers, and bulkheads. Include unit tests with injected faults, integration tests with simulated downstream failures, chaos experiments in staging, and metrics or SLO checks to gate deployments.
EasyTechnical
80 practiced
Design liveness and readiness health checks for a stateful service that depends on an in-memory cache, a SQL database, and a downstream authentication service. Describe what each check should validate, recommended frequencies and timeouts, and how orchestrators and load balancers should respond to each signal.
MediumTechnical
86 practiced
In Java, implement a thread-safe in-memory CircuitBreaker class with methods recordSuccess(), recordFailure(), allowsRequest(), and onResetCallback(Runnable). Use a simple sliding-window error counter and support configurable thresholds and open duration. Persistence and cluster-wide sync are not required for this exercise.
EasyTechnical
64 practiced
Describe the bulkhead pattern for isolating failures within a microservice or deployment. Provide examples of resource-level bulkheads (thread pools, connection pools), tenancy-level bulkheads, and explain how bulkheads reduce blast radius during partial outages or noisy neighbors.
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