Unity Catalog
An open-source, multi-format data catalog by Databricks (Linux Foundation), supporting Iceberg, Delta Lake, Hudi, and unstructured data with built-in access control and lineage.
Summary
An open-source, multi-format data catalog by Databricks (Linux Foundation), supporting Iceberg, Delta Lake, Hudi, and unstructured data with built-in access control and lineage.
Unity Catalog bridges the Databricks ecosystem with the broader open lakehouse world. For organizations with significant Delta Lake investments that also need Iceberg interoperability, Unity provides a single catalog that spans both formats without requiring XTable or UniForm.
- Open-source Unity Catalog is not identical to the managed Databricks Unity Catalog. Feature parity varies; some governance features are Databricks-only.
- Multi-format support does not mean seamless interoperability. Each format still has its own metadata semantics; Unity provides unified access, not automatic translation.
implementsIceberg REST Catalog Spec — standard REST API for engine-neutral accessenablesDelta Lake, Apache Iceberg — multi-format catalog supportsolvesVendor Lock-In — open alternative to proprietary Databricks catalog
Definition
An open-source, multi-format data catalog originally developed by Databricks and donated to the Linux Foundation. Supports Iceberg, Delta Lake, Hudi, and unstructured data with built-in access control and lineage.
The lakehouse ecosystem needs a catalog that is not tied to a single table format or vendor. Unity Catalog provides a unified governance layer for Delta Lake users who also need Iceberg interoperability, and for organizations standardizing on open catalog APIs.
Multi-format catalog for Delta and Iceberg tables on S3, unified access control across storage and compute, data lineage tracking.
Connections 7
Outbound 6
scoped_to2implements1enables2solves1Inbound 1
enables1Resources 3
Official Unity Catalog open-source project site with documentation on multi-format catalog capabilities and governance features.
Source repository for open-source Unity Catalog with setup guides, API documentation, and integration examples.
Side-by-side comparison of Unity Catalog and Polaris covering RBAC, format support, and deployment trade-offs.