Apache Iceberg v4: The Current State, the Proposals, and Why They Matter (opens in new tab)  🔒Immutability

A few years ago the question about Apache Iceberg was whether open table formats could replace proprietary warehouses. That question is closed. Iceberg won. The new question is sharper and more interesting. What do we do with it next? That is the question driving Iceberg v4. At Iceberg Summit 2026 in San Francisco, more than 600 people gathered for two days and over 70 sessions. Not one talk tried to convince the room to adopt Iceberg. Every session assumed you already run it in production. T...