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Infino Blog: engineering notes and case studies

featured · case study · People search across thirty years of court records One people index across 30 years of court records; the agency reports months-to-days processing and cost reduced by more than 5×.
  1. What is hybrid search? Two retrievers that miss different things, and the rank fusion that merges their lists.
  2. Why object-storage vectors use OPANN + Sq16, while RAM uses HNSW One durable vector corpus, with a graph in RAM and bounded range reads on object storage.
  3. Inside a Parquet superfile Why the indexes live inside Parquet, how the footer addresses them, and where the format still hurts.
  4. Cutting a ten-term BM25 OR from 74.6 ms to 20.0 ms Common terms defeated MaxScore skipping; a 4096-document window removed the per-document cursor merge.
  5. The 3× to 10× regression from running decode on tokio’s I/O pool Cold vector search went from 1.1 s to 3.7-11 s when CPU-heavy decode starved object-store I/O.
  6. The three costs of a cold query on S3 File discovery, connection setup, and cache residency on the first query from a new worker.
  7. A commit on S3 is one compare-and-swap Stage immutable files in parallel; publish the complete table with one conditional pointer write.
  1. From 51 FlexLM CSVs to conversational license analytics License exports became auditable SQL and dashboards whose saved queries run without a model.