A Deep Dive into Polaris: Simplifying Iceberg Catalog Management

Last week, Snowflake's native Managed Iceberg Tables were examined, revealing some limitations, but a new approach called Polaris has been announced as an Apache incubated Iceberg Catalog. Polaris, which implements the Iceberg Catalog REST API for improved cross-compatibility, is available as a hosted service for Snowflake customers and as an open-source project for self-hosting. It introduces a simpler access control layer than other data warehouses, with catalogs acting as top-level containers for table sets grouped into namespaces, offering a more flexible structure than the traditional three-tier naming convention. Catalogs can be internal, managed by Polaris, or external, managed by another Iceberg catalog provider. The access control system is based on Principal Roles and Catalog Roles, with privileges applied at the catalog level. Setting up Polaris involves creating a catalog, establishing connections, and deciding on using Snowflake or a separate process like Spark for managing Iceberg tables, with specific steps depending on the chosen method.