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7 articles

RAG pipeline preprocessingweb data for RAGRAG input qualityLangChainLlamaIndexvector databaseembedding qualityweb scrapingmarkdownAI engineering

RAG Pipeline Preprocessing: Why Web Data Quality Determines Everything

Most RAG pipelines fail not because of bad retrievers or weak LLMs — they fail because of dirty input data. This deep-dive covers the complete preprocessing architecture for web data: crawling, cleaning, chunking, embedding, and storage, with real Python code and benchmark results.

2026-04-0417 min read