Hi, I am trying to retrieve an azure schema registry schema for an eventhub. I need to get the Avro schema for a specific topic/eventhub in the eventhub namespace. I see how to retrieve the Schema given a SchemaId using the SchemaRegistryAsyncClient, but I am not sure how to retrieve the schema id given an eventhub in an eventhub namespace.

Hello @Francis Fiore thanks for reaching out. Schemas and schemas groups are separate objects within the namespace and hence those are not tied to entities (event hubs within the event hub namespace). You might be having a separate schema group per entity, in which case you can retrieve all the schemas for a given schema group, few examples below on how to achieve that: Using the Get Schemas REST API Using the SDK currently there is not a method to retrieve all schemas for a given a group, however, if this what you are looking for, I can reach out to the SDK internally to check on whether there are plans to implement this soon, in the meantime using the REST API would be the way to go.

How retrieve an azure event hub schema given an eventhub namespace & eventhub

Accepted answer

joseandresc 320 Reputation points Microsoft Employee

2024-04-12T22:21:26.06+00:00
Hello @Francis Fiore thanks for reaching out.

Schemas and schemas groups are separate objects within the namespace and hence those are not tied to entities (event hubs within the event hub namespace).

You might be having a separate schema group per entity, in which case you can retrieve all the schemas for a given schema group, few examples below on how to achieve that:

Using the Get Schemas REST API

Using the SDK currently there is not a method to retrieve all schemas for a given a group, however, if this what you are looking for, I can reach out to the SDK internally to check on whether there are plans to implement this soon, in the meantime using the REST API would be the way to go.
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Francis Fiore 20 Reputation points

2024-04-15T13:16:08.92+00:00

Ok thanks, this is really helpful, will definitely leverage that API.

How do I then determine which schema a specific eventhub is using? Is it message by message or is there a way at the eventhub level to determine which schema is being used?

joseandresc 320 Reputation points Microsoft Employee

2024-04-15T22:40:05.5233333+00:00

Hi @Francis Fiore you will need to inspect the producers/consumers to understand which schema is being used for which entity.

While the schema registry is hosted on Azure Event Hubs, this is a feature that you could even leverage with third party message brokers, hence this is not something specifically tied to an entity. See documentation

When you inspect the producer/consumer code you can look for the schema id being used in the different API calls, similar to this example the client might also be passing the group name, schema name and version.

To make it easier to manage, you could create a separate schema group per entity, following the same naming convention as the entity it is being used for.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let me know.
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How retrieve an azure event hub schema given an eventhub namespace & eventhub

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