Introduction

The TestUC1003 – Role Not Assigned error in Databricks Unity Catalog occurs when a required role or permission has not been assigned to the user, service principal, or workspace attempting to access Unity Catalog resources. This error often prevents users from creating catalogs, accessing tables, or managing data objects in Unity Catalog.

🚨 Common symptoms of TestUC1003 – Role Not Assigned:

• Error: “TestUC1003 – Role Not Assigned” when running USE CATALOG or accessing Unity Catalog tables.
• Cannot create or access catalogs, schemas, or tables.
• Service principal or user cannot access the metastore.
• Permissions denied while managing Unity Catalog resources.

Common Causes and Fixes for TestUC1003

1. Missing Metastore Administrator Role

Symptoms:

• Error: “You do not have permission to access this metastore.”
• Cannot list or create Unity Catalog objects (catalogs, schemas, tables).

Causes:

• The user is not assigned the Metastore Admin role.
• Admin permissions are missing in the Unity Catalog configuration.

Fix:
✅ Check current roles and permissions:

SHOW GRANTS;

✅ Assign the Metastore Admin role to the user or group:

GRANT METASTORE ADMIN ON METASTORE TO `user@example.com`;

✅ Verify role assignment:

SHOW GRANTS ON METASTORE;

2. Service Principal Not Assigned to Unity Catalog Roles

Symptoms:

• Error: “Role not assigned to service principal.”
• Jobs or clusters fail to access Unity Catalog tables.
• Databricks SQL queries return permission errors.

Causes:

• The service principal lacks the necessary roles to access Unity Catalog.
• Managed identity permissions are not properly assigned in Azure.

Fix:
✅ Assign the service principal to the required role:

GRANT USE CATALOG ON CATALOG my_catalog TO `service-principal-id`;

✅ For Azure, ensure the managed identity has permissions in Key Vault and storage:

az role assignment create --assignee <service-principal-id> --role "Storage Blob Data Contributor"

✅ Verify role assignment for the service principal:

SHOW GRANTS ON CATALOG my_catalog;

3. User Lacks Access to Catalogs or Schemas

Symptoms:

• Error: “You do not have permission to use this catalog.”
• Cannot query tables or list schemas in Unity Catalog.

Causes:

• The user is not assigned to the necessary roles for catalog or schema access.
• Default permissions are not granted to all users.

Fix:
✅ Grant the necessary roles to the user:

GRANT USE CATALOG ON CATALOG my_catalog TO `user@example.com`;
GRANT SELECT ON TABLE my_catalog.my_schema.my_table TO `user@example.com`;

✅ Verify the assigned roles:

SHOW GRANTS ON CATALOG my_catalog;

4. Cluster Not Configured to Support Unity Catalog

Symptoms:

• Error: “Cluster cannot access Unity Catalog.”
• SQL commands fail on Unity Catalog-enabled clusters.

Causes:

• Cluster is not Unity Catalog-enabled.
• The wrong IAM roles or service principals are used for cluster configuration.

Fix:
✅ Ensure Unity Catalog support is enabled on the cluster:

• Go to Databricks UI → Clusters → Edit Cluster → Advanced Options and enable Unity Catalog support.
• Restart the cluster.

✅ Assign proper roles to the cluster:

databricks unity-catalog clusters configure --cluster-id <cluster-id> --iam-role <iam-role>

Step-by-Step Troubleshooting Guide

Step 1: Check Assigned Roles for the User or Service Principal

SHOW GRANTS;

Step 2: Verify Metastore and Catalog Permissions

SHOW GRANTS ON METASTORE;
SHOW GRANTS ON CATALOG my_catalog;

Step 3: Ensure the Cluster Supports Unity Catalog

• Restart the cluster and verify Unity Catalog settings.

Step 4: Test Access to Unity Catalog Tables

USE CATALOG my_catalog;
SHOW TABLES IN my_schema;

Best Practices to Avoid TestUC1003 – Role Not Assigned Error

✅ Ensure Metastore Admin Role Is Assigned

• All Unity Catalog users should be assigned the appropriate roles for access.

✅ Grant Roles to Service Principals for Automated Jobs

• For service principals, ensure access to catalogs, schemas, and tables.

✅ Regularly Audit Role Assignments

• Use SHOW GRANTS to audit and manage permissions.

✅ Enable Unity Catalog Support on Clusters

• Ensure clusters are properly configured for Unity Catalog.

Conclusion

The TestUC1003 – Role Not Assigned error in Databricks Unity Catalog occurs when users, service principals, or clusters lack necessary roles. By assigning appropriate roles, enabling Unity Catalog support, and auditing permissions, you can resolve this error and ensure secure access to Unity Catalog resources.

Mohammad Gufran Jahangir