Apache Data Lakehouse Weekly: February 18–25, 2026

Get Data Lakehouse Books: Apache Iceberg: The Definitive Guide Apache Polaris: The Defintive Guide Architecting an Apache Iceberg Lakehouse The Apache Iceberg Digest: Vol. 1 Lakehouse Community: Join the Data Lakehouse Community Data Lakehouse Blog Roll OSS Community Listings Dremio Lakehouse Developer Hub This week belongs to Apache Polaris. After months of incubation votes, community reviews, and governance discussions, Polaris officially graduated to a top-level Apache Software Foundation project on February 18. That announcement set the tone for a week where governance maturity and format evolution ran in parallel across all four projects. Apache Iceberg The Iceberg dev list continued active threads from the prior two weeks, with V4 planning gaining momentum and a community meetup landing in Warsaw on February 18. metadata.json in V4 — The Debate Deepens Anton Okolnychyi's thread on making the root metadata JSON file optional in Iceberg V4 remains one of the hottest discussions in