What is Apache Polaris? Unifying the Iceberg Ecosystem

This article explains how Apache Polaris solves the catalog fragmentation problem in the Apache Iceberg lakehouse ecosystem. It describes how proprietary catalogs threatened to create data silos, and how the Iceberg REST Catalog API emerged as an open standard. Polaris is a vendor-neutral, open-source implementation of this API, enabling any compute engine (Spark, Flink, Trino, Dremio) to interoperate seamlessly. It provides enterprise security through Role-Based Access Control (RBAC) and credential vending, ensuring centralized metadata management and transactional consistency across engines. The article is part of a series on open-source lakehouse technologies.