---
title: "Expanded interoperability with Unity Catalog Open APIs"
description: "Unity Catalog’s expanded Open APIs address data silos by letting organizations use multiple compute engines while retaining centralized governance and a single copy of data. In beta, Apache Spark, Apache Flink, and DuckDB can create, read, write, and stream to or from UC managed Delta tables, with catalog commits providing serialized commits, transactional safety, and auditability. Delta Kernel, an open source Java and Rust library, abstracts low-level protocol details, helping connectors integrate external writes with catalog-managed commits while Predictive Optimization continues to run on accessed tables. Credential vending, now GA for tables, issues short-lived, scoped cloud credentials and supports M2M OAuth plus automatic refresh; volume credential vending is in Public Preview for unstructured data. The roadmap includes functionality for fine-grained row- and column-level ABAC on external reads, while external managed-table access remains in beta."
---

# Expanded interoperability with Unity Catalog Open APIs

[Databricks](https://yomu.fyi/company/databricks) · Alex Jiang, Tathagata Das · May 14, 2026

**Type:** Announcement

## Summary

Unity Catalog’s expanded Open APIs address data silos by letting organizations use multiple compute engines while retaining centralized governance and a single copy of data. In beta, Apache Spark, Apache Flink, and DuckDB can create, read, write, and stream to or from UC managed Delta tables, with catalog commits providing serialized commits, transactional safety, and auditability. Delta Kernel, an open source Java and Rust library, abstracts low-level protocol details, helping connectors integrate external writes with catalog-managed commits while Predictive Optimization continues to run on accessed tables. Credential vending, now GA for tables, issues short-lived, scoped cloud credentials and supports M2M OAuth plus automatic refresh; volume credential vending is in Public Preview for unstructured data. The roadmap includes functionality for fine-grained row- and column-level ABAC on external reads, while external managed-table access remains in beta.

## Context

Data teams previously duplicated datasets across platforms, rebuilt access policies, and synchronized fragmented systems, increasing storage costs and allowing policies to drift out of sync.

## Approach / What changed

Unity Catalog expands its Open APIs with beta external access to managed Delta tables, catalog-managed commits, Delta Kernel integrations, and credential vending. Table credential vending is generally available with M2M OAuth and automatic refresh, while volume credential vending is in Public Preview and fine-grained ABAC functionality is planned for external reads.

## Takeaways

- External engines can create, batch read and write, and stream to or from Unity Catalog managed Delta tables in the beta, with serialized catalog commits preventing log corruption and providing auditability.
- Credential vending supplies short-lived, resource-scoped cloud credentials governed by Unity Catalog privileges; M2M OAuth and automatic refresh support long-running pipelines without personalized access tokens.
- Delta Kernel abstracts Delta protocol details for connector developers, and volume credential vending extends scoped external access and governance to unstructured files such as images, PDFs, and videos.

**Tags:** [Apache Spark](https://yomu.fyi/topic/apache-spark), [Data Governance](https://yomu.fyi/topic/data-governance), [Delta Lake](https://yomu.fyi/topic/delta-lake), [Unity Catalog](https://yomu.fyi/topic/unity-catalog)

- Source: [Databricks](https://www.databricks.com/blog/expanded-interoperability-unity-catalog-open-apis)
- Source URL: https://www.databricks.com/blog/expanded-interoperability-unity-catalog-open-apis
- Ingested by Yomu: 2026-08-31T03:34:33.652Z

[Read original post](https://www.databricks.com/blog/expanded-interoperability-unity-catalog-open-apis)