The 302 error in Databricks typically indicates a redirection issue. This can occur in several scenarios within the Databricks environment:

Common Causes and Solutions

• Networking Issues:
  • Misconfigured Networks: Ensure proper configuration of VPC peering, private links, and DNS settings between Databricks workspaces or between Databricks and external services.
  • Firewall Rules: Check firewall rules to ensure that traffic is allowed between the necessary components.
• Authentication Issues:
  • Incorrect Credentials: Verify that the credentials for accessing Databricks resources are valid and have the necessary permissions.
  • Session Expiration: If the session has expired, re-authenticate to resolve the issue.
• Unity Catalog Quickstart:
  • Users have reported the 302 error when attempting to run the Unity Catalog Quickstart. Check the Databricks community forums for the latest updates and workarounds on this issue.
• Cluster Configuration:
  • Incorrect Spark UI Configuration: If the Spark UI is misconfigured (e.g., the wrong host/port in YARN client mode), it can lead to 302 redirects. For correct configuration, refer to Databricks documentation or support.

Troubleshooting Steps

1. Check Network Connectivity: Verify proper network connectivity between the involved components (Databricks workspaces, external services, etc.). Use tools like ping or traceroute to test connectivity.
2. Review Logs: Examine Databricks logs and any relevant logs from other services involved in the communication to identify the root cause of the redirection.
3. Inspect Authentication: Double-check the credentials for accessing Databricks resources and ensure they are valid and have the required permissions.
4. Databricks Community: Search the Databricks community forums for similar issues and potential solutions.
5. Contact Databricks Support: If the issue persists, contact Databricks support for further assistance.

Additional Tips

• Specific Error Messages: Pay close attention to any particular error messages accompanying the 302 error, as they can provide valuable clues about the underlying cause.
• Recent Changes: If the error started after recent changes (e.g., network configuration updates, software upgrades), review those changes to see if they might be related.