Production-Grade Agentic RAG Pipeline: Hybrid Retrieval and Scalable Deployment Practice

The open-source project introduced in this article (original author: arpon-kapuria, source: GitHub, project link: https://github.com/arpon-kapuria/scalable-agentic-rag-pipeline) provides a production-grade agentic RAG pipeline architecture, covering a hybrid vector and graph retrieval solution, a vLLM-powered inference service, and a scalable deployment tech stack using Ray and Kubernetes on AWS EKS, addressing key challenges of RAG systems from prototype to production.

Retrieval-Augmented Generation (RAG) is a core pattern for large model applications, but productionization faces three major challenges: low-latency response in high-concurrency scenarios, continuous optimization of retrieval accuracy, and ensuring system observability and maintainability. This project provides a battle-tested solution, offering a reusable architecture template for enterprise-level agent applications.

Traditional RAG relying on single vector retrieval has limitations. This project's hybrid solution combines vector and graph databases:

• Vector retrieval layer: Handles semantic matching, encodes document fragments into dense vectors, suitable for open-ended questions and concept matching;
• Graph retrieval layer: Models entity relationships, performs multi-hop reasoning and path queries, suitable for relational scenarios;
• Collaborative mechanism: Dynamic selection/combination strategy to improve retrieval accuracy and coverage.

Using vLLM as the inference engine, leveraging PagedAttention to optimize KV Cache memory management and improve GPU utilization. The inference service is decoupled from the retrieval layer, enabling independent scaling, different optimization strategies, and fault isolation to enhance system performance and stability.

Building a deployment solution based on AWS tech stack:

• Amazon EKS: Container orchestration, providing auto-scaling, service discovery, etc.;
• Ray framework: Manages distributed computing tasks (document indexing, batch queries, etc.);
• Terraform: Infrastructure as Code, ensuring deployment reproducibility and environment consistency.

Built-in complete monitoring and evaluation mechanism:

• Retrieval quality evaluation: Tracks accuracy, recall, F1, etc., supports offline evaluation;
• Generation quality monitoring: Collects user feedback, calculates perplexity;
• System performance monitoring: Covers latency, throughput, error rate, integrates AWS CloudWatch alerts.

Applicable scenarios: Enterprise knowledge base Q&A, research literature analysis, multimodal content retrieval. Practical recommendations: First validate the core process locally, then deploy a test environment using Terraform, and finally adjust retrieval strategies and model configurations.

The RAG architecture is evolving from simple 'vector retrieval + prompt enhancement' to complex intelligent systems. Hybrid retrieval, scalable deployment, and observability will become standard. This open-source project provides practical reference for this direction and is worth developers' attention and learning.