Top 3 Recall Interview Questions

Browse 3 real-world technical and behavioral interview questions about Recall. Review scenarios, edge cases, and architectural best practices.

Explain batch and serial genealogy, how it supports a recall, and what statistical process control gives you that a threshold alarm does not.

Genealogy is the recorded graph linking consumed lots, equipment and process settings to what was produced, and it makes a recall narrow instead of total. SPC monitors a process against its own variation, so it detects drift before anything breaches a specification limit. Use this traceability answer to show the decision, trade-off, and evidence rather than a memorised definition.

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How do you choose between a flat index, IVF and HNSW for vector search?

Flat search is exact and scales linearly, so it suits small collections and supplies ground truth for the rest. IVF trades recall for speed by probing a subset of clusters, HNSW does it with a graph at higher memory and build cost, and in both recall is a parameter you set rather than inherit.

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Which metrics tell you whether retrieval is working?

Recall at k is the primary one, since a passage that never reaches the prompt cannot be used; precision at k measures wasted window; MRR or NDCG measure ordering. Read them beside the groundedness of the answer, because high recall with bad answers points at generation or context ordering.

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