Apache Polaris

Apache Polaris is an open-source metadata catalog and access control server designed specifically for Apache Iceberg tables. It provides a centralized repository for tracking table states and enforces unified security policies across multiple query engines.

How it Works

Apache Polaris acts as the central coordinator for Iceberg metadata, managing table definitions and access permissions.

• Central Catalog: Tracks the current metadata pointer for all Apache Iceberg tables in the data lakehouse, enabling read-write synchronization.
• Credential Vending: Dynamically generates short-lived object storage access credentials for query engines, preventing engines from directly accessing storage locations.
• Cross-Engine Security: Standardizes role-based access control (RBAC), ensuring that security policies are applied consistently regardless of whether the query engine is Spark, Flink, or Dremio.

Lakehouse & Agentic Relevance

In a data lakehouse, multiple query engines access the same physical files. Without a central catalog like Polaris, managing permissions across engines is complex and prone to security gaps. Autonomous agents querying data require a secure catalog to locate and read tables safely. Dremio integrates with Apache Polaris as a compute engine, utilizing Polaris to resolve Iceberg metadata pointers and enforce access policies. This integration ensures that agents query governed tables while respecting enterprise data access policies.