#Reliability

24 questions

How do you implement graceful shutdown?Node.js#reliabilitySenior
How do you approach logging and monitoring in production Node?Node.js#reliabilitySenior
What are BullMQ’s pros and cons, and when should you use it?Node.js#messagingMiddle
How do you coordinate a cron job across multiple NestJS nodes?NestJS#concurrencySenior
How do you archive old data and safely purge partitions?System Design#databaseSenior
When is Elasticsearch a poor fit as the primary database?System Design#databaseSenior
What is a distributed cache, and how do you handle its failures?System Design#scalingSenior
How would you design monitoring for an application from scratch?Site Reliability & Operations#observabilityMiddle
How do you choose alert thresholds to avoid alert fatigue and false positives?Site Reliability & Operations#alertingMiddle
How do you detect problems before users complain?Site Reliability & Operations#observabilityMiddle
How do you decide what to cache and for how long (TTL)?Site Reliability & Operations#cachingMiddle
What is a cache stampede and how do you prevent it?Site Reliability & Operations#cachingMiddle
How do you design a backup and disaster recovery strategy?Site Reliability & Operations#disaster-recoverySenior
What is graceful degradation when a dependency fails?Site Reliability & Operations#resilienceMiddle
How do circuit breakers and retries with backoff work in distributed systems?Site Reliability & Operations#resilienceMiddle
What are liveness, readiness, and startup probes, and when do you use each?Kubernetes#reliabilityMiddle
What are StatefulSets, PersistentVolumes/Claims, and how do you run stateful workloads on Kubernetes?Kubernetes#reliabilitySenior
What is idempotency, and how do idempotency keys make retries safe?REST API Design#apiMiddle
How do Nginx upstreams balance traffic and handle failed nodes?Nginx#nginxMiddle
What happens to active requests when Nginx reloads?Nginx#reliabilitySenior
Why is a newly indexed document missing from search?Elasticsearch#databaseMiddle
How do you change a mapping using reindex and aliases?Elasticsearch#data-migrationMiddle
How do you investigate a yellow or red Elasticsearch cluster?Elasticsearch#troubleshootingSenior
How do you speed up bulk indexing without overloading the cluster?Elasticsearch#performanceSenior