topic Re: Unity catalog issues in Data Engineering

Unity catalog issues

Snoonan — Fri, 19 Apr 2024 09:09:06 GMT

Hi all,

I have recently enabled Unity catalog in my DBX workspace. I have created a new catalog with an external location on Azure data storage.

I can create new schemas(databases) in the new catalog but I can't create a table. I get the below error when trying to create a table:

Failed to acquire a SAS token for list on /__unitystorage/catalogs/d333fd28-cf81-4737-90f0-d164883a55ca/tables/58c77eb9-c058-447f-b3b9-58bd2760e381/_delta_log due to java.util.concurrent.ExecutionException: com.databricks.sql.managedcatalog.UnityCatalogServiceException: [RequestId=b2e77357-64ff-48ec-a85b-3eb1da8d6764 ErrorClass=TABLE_DOES_NOT_EXIST.RESOURCE_DOES_NOT_EXIST] Table '58c70eb9-c059-447f-b3b9-58bd2760e321' does not exist.

When I try to access the external location through DBX I get the below error:

Error loading files.

Input path url 'abfss://dbx-xxx-hive-metastore-unity-catalog@yyyyydfs.core.windows.net/__unitystorage' overlaps with managed storage within 'ListFiles' call

Has anyone seen either these errors before and understands how to fix them?

Thanks,

Sean

Re: Unity catalog issues

daniel_sahal — Fri, 19 Apr 2024 09:20:03 GMT

@Snoonan
Make sure that permissions are correct.
Databricks Access Connector requires at least:
- Blob Data Reader on storage,
- Blob Data Contributor on container

Re: Unity catalog issues

Snoonan — Fri, 19 Apr 2024 10:05:33 GMT

Hi @daniel_sahal ,

Thank you. I did not give access connector 'Blob Data Reader' on storage account.

Since doing this I now have the error:

This Azure storage request is not authorized. The storage account's 'Firewalls and virtual networks' settings may be blocking access to storage services. Please verify your Azure storage credentials or firewall exception settings.

What do you think needs to be done here? DBX notebooks have read from this storage account before.

Re: Unity catalog issues

daniel_sahal — Fri, 19 Apr 2024 10:27:03 GMT

@Snoonan
First of all, check the networking tab on the storage account to see if it's behind firewall. If it is, make sure that Databricks/Storage networking is properly configured (https://learn.microsoft.com/en-us/azure/databricks/security/network/classic/vnet-inject)

Re: Unity catalog issues

Snoonan — Fri, 19 Apr 2024 12:15:03 GMT

@daniel_sahal ,

I have checked this and the vnet is set up correctly to the best of my knowledge.

I can access the data using notebook using a unity catalog enabled cluster. For SQL editor I am using a serverless warehouse cluster.

I wonder how these differ such that one can access the data and the other can't?

Re: Unity catalog issues

daniel_sahal — Mon, 22 Apr 2024 06:27:15 GMT

@Snoonan
Serverless needs a little bit different setup than the normal clusters.
More info here: https://learn.microsoft.com/en-us/azure/databricks/security/network/serverless-network-security/serverless-firewall

Re: Unity catalog issues

Snoonan — Mon, 22 Apr 2024 07:01:53 GMT

@daniel_sahal

That worked. Thank you for your help.