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Fallbacks and Provider Failover

You are on an availability commitment and your model provider is not under your control. Failover means deciding in advance what a degraded answer looks like, because the alternative is that an outage upstream becomes an outage in the customer's workflow, and they signed the contract with you.

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RELATED CONCEPTS

Circuit Breakers and Backpressure Retries, Exponential Backoff and Jitter Model Routing and Cascades Latency Optimization AI Incident Response

LESSONS THAT TEACH THIS

Hard DeploymentsDecide now what the system does on the day the model is unavailable16 min→

PRACTICE THIS IN REAL QUESTIONS

SQL & Data EngineeringFind users who logged in on 3 or more consecutive days (gaps-and-islands).→SQL & Data EngineeringSessionize a raw event stream in SQL: a gap of more than 30 minutes starts a new session.→RAG & Agent System DesignTake a RAG POC from 50 docs in a notebook to 5M docs, 2k QPS, and a 99.9% SLA→System Design & Production EngineeringDesign multi-region failover for an LLM product, including the day your model provider goes down.→System Design & Production EngineeringYour pilot wowed the customer. Take it to production: 99.9% SLA, real users, their security team watching. Design the path.→ML Infrastructure & GPUsServe a 400B-class MoE under a 200ms p99 inter-token SLA. How do you lay it out?→