Technology

Apache Polaris

An open-source REST catalog for Apache Iceberg with centralized RBAC, originally developed by Snowflake and donated to Apache.

7 connections 3 resources

Summary

What it is

An open-source REST catalog for Apache Iceberg with centralized RBAC, originally developed by Snowflake and donated to Apache.

Where it fits

Polaris is the vendor-neutral answer to the "catalog wars" of 2025-2026. As Iceberg becomes the dominant table format, every engine needs a single source of truth for table metadata. Polaris implements the Iceberg REST Catalog Spec, making it the interoperable choice for multi-engine lakehouse environments.

Misconceptions / Traps
  • Polaris is a metadata catalog, not a query engine. It does not execute queries — it serves metadata to engines that do.
  • Requires a persistence backend (PostgreSQL or similar). Not a standalone binary; deployment complexity is non-trivial.
Key Connections
  • implements Iceberg REST Catalog Spec — the standard REST interface for Iceberg catalogs
  • enables Apache Iceberg — provides metadata management for Iceberg tables on S3
  • solves Vendor Lock-In — engine-neutral catalog alternative to AWS Glue or Databricks Unity
  • competes_with Unity Catalog, Apache Gravitino

Definition

What it is

An open-source REST catalog for Apache Iceberg, originally developed by Snowflake and donated to the Apache Software Foundation. Provides centralized role-based access control (RBAC) for Iceberg table metadata.

Why it exists

As multiple compute engines (Spark, Trino, Flink, Snowflake) read and write to the same Iceberg tables on S3, organizations need a single, vendor-neutral catalog that enforces consistent access policies. Polaris decouples metadata governance from any specific engine.

Primary use cases

Centralized Iceberg catalog for multi-engine environments, RBAC enforcement across data lakehouse platforms, vendor-neutral metadata management.

Connections 7

Outbound 5
scoped_to2
S3Table Formats
implements1
Iceberg REST Catalog Spec
enables1
Apache Iceberg
solves1
Vendor Lock-In
Inbound 2
enables2
Apache GravitinoCredential Vending

Resources 3

DocsHigh
polaris.apache.org/

Official Apache Polaris project site with documentation on deploying and configuring the open-source Iceberg REST catalog.

GitHubHigh
github.com/apache/polaris

Source repository for Polaris with release notes, architecture docs, and contribution guidelines.

BlogMedium
yeedu.com/posts/apache-polaris-data-catalog-for-open-data-pl...

Practical overview of Polaris architecture, RBAC capabilities, and how it compares to other Iceberg catalogs.