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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

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LESSONS THAT TEACH THIS

The FDE EngagementMake replay, quarantine and reconciliation part of the pipeline contract30 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?→