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Parent-Child and Hierarchical Chunking (ANSWERED)

Scenario BasedRAGMedium15 min read

Medium RAG interview question on parent-child and hierarchical chunking — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Index small child chunks for precise retrieval but pass parent sections (or documents) to the LLM for broader context. Metadata links child→parent enable small-to-big expansion without sacrificing search precision.

The Interview Question

Explain parent-child and hierarchical chunking. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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