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RAG in Production: Reliability, Latency, and Cost for LLM Apps

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Kiril urbonas

7 months ago • 1 min read•Updated Mar 22, 2026•1 view

Run retrieval-augmented generation at scale. Chunking, caching, and observability.

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RAG in Production: Reliability, Latency, and Cost for LLM Apps Architecture Basics Reliability Latency Cost

RAG in Production: Reliability, Latency, and Cost for LLM Apps

RAG (retrieval-augmented generation) powers many LLM apps. Here’s how to run it reliably in production.

Architecture Basics #

Ingest: Chunk documents, embed, store in a vector DB.
Query: Embed query, retrieve top-k, optionally re-rank, then prompt LLM with context.

Reliability #

Retries with backoff for embedding and LLM APIs.
Fallbacks (e.g. cached answer or “try again”) when retrieval or LLM fails.
Timeouts so one slow call doesn’t block the whole request.

Latency #

Cache frequent queries or embeddings where safe.
Async embedding for ingest; keep query path synchronous and fast.
Re-ranking: Use a small re-ranker only when needed to balance quality and latency.

Cost #

Chunk size and top-k affect token usage; tune for quality vs cost.
Model choice: Smaller or quantized models for simple tasks; reserve larger models for hard queries.

Best practice: add metrics (latency p95, cache hit rate, cost per query) and alerts so you can iterate.

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About Kiril urbonas

DevOps Engineer and AI Enthusiast

256 articles

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