Posts

All the articles I've posted.

• Why Your RAG Search Returns Different Results Every Time (Part 1)

  Updated: 24 Oct, 2026

  Same query, same corpus, different top 10. A tour of every layer in a RAG pipeline that can make retrieval results move, from Unicode normalization to replica divergence to fusion scoring.

• Fixing Unstable RAG Retrieval (Part 2)

  Updated: 24 Oct, 2026

  How to find out which layer is making your RAG results move, in an order that costs almost nothing to start, and what to actually do about each one.

• The Pre-Filter and Post-Filter Cliff in Vector Search

  6 Oct, 2026

  Why a metadata filter can make vector search suddenly slow or silently incomplete, and how to pick between pre-filtering, post-filtering, and filter-aware search.

• RDS MySQL Blue/Green Upgrades: Don't Let Debezium Lose Its Place

  Updated: 15 Sep, 2026

  How to run a major version upgrade on RDS MySQL without breaking your Debezium CDC pipeline. Covers binlog position recovery, GTID auto-positioning, and how to verify you did not lose any changes.