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Message Queues and Pub/Sub

A queue decouples a fast producer from a slow consumer and absorbs bursts that would otherwise take a downstream system down. The design decisions that matter are delivery semantics, ordering scope, and what happens to a message that can never succeed, because that last one is what silently accumulates until someone looks.

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RELATED CONCEPTS

Streaming and Backpressure Idempotency Circuit Breakers and Backpressure Retries, Exponential Backoff and Jitter Batch vs Streaming

LESSONS THAT TEACH THIS

The FDE EngagementA pipeline is finished when someone can safely backfill it14 min→

PRACTICE THIS IN REAL QUESTIONS

RAG & Agent System DesignWalk me through a RAG pipeline end-to-end, and tell me where it usually breaks→ML Infrastructure & GPUsExplain how the CUDA execution model maps to hardware, grids, blocks, warps, SMs.→ML Infrastructure & GPUsWalk me through the GPU memory hierarchy, registers, shared memory, L2, HBM. What lives where and why?→ML Infrastructure & GPUsWhat is warp divergence and why does it hurt performance?→RAG & Agent System DesignWhen is an agent the wrong answer? Argue against building one.→System Design & Production EngineeringWhat is a dead-letter queue, and how do you handle a poison message in production?→