How to retrieve all Schema Versions from a given Schema Group, Schema in EventHub.

Kasam, Sai 0

Hi,

I am trying to access Schema Registry of a Event Hub Namespace. I want to be able to read all the versions of a SchemaDefinitions inside a known SchemaGroup and SchemaName.

I know that there are SchemaRegistryClients(Azure class) provided in Azure SDK for java repo which allows us to read schemas from Schema Registry provided we have SchemaGroup, SchemaName and version number.

In my case I am trying to read all the schema versions for a schema, is there a way for me to get a list of all versions of the Schema Definition? I am currently providing sequence of integers starting from 1 to read all versions of SchemaDefinition for a Schema, does this look good or is there any better alternative available? Also could you raise a request so that Azure SDK provides this feature in the future if it is not provided yet?

We have APIs(Azure API) available which provides us list of schemas under a SchemaGroup, does this provide all versions of all Schemas under a group or just the latest versions of all the schemas under the SchemaGroup?

PRADEEPCHEEKATLA-MSFT 82,041 Reputation points Microsoft Employee

2024-05-21T06:00:21.2833333+00:00

@Kasam, Sai - Thanks for the question and using MS Q&A platform.

Regarding your question, the Azure SDK for Java provides a listSchemaVersions method in the SchemaRegistryClient class that allows you to retrieve all versions of a schema definition for a given schema group and schema name. You can use this method to get a list of all versions of the schema definition.

Regarding your second question, the Get Schemas API you mentioned provides a list of all schemas under a schema group, including all versions of each schema. So, you can use this API to get all versions of all schemas under a schema group.

I hope this helps! Let me know if you have any further questions.
Kasam, Sai 0 Reputation points

2024-05-21T19:05:10.0666667+00:00
Hi Pradeep,

Thanks for the response. This is the repo link and the pom dependency that I had used

<dependency> <groupId>com.microsoft.azure</groupId> <artifactId>azure-schemaregistry-kafka-avro</artifactId> <version>1.1.1</version> </dependency>

for the SchemaRegistryClient for java I was referring to in the code.

I was not able to find the listSchemaVersions function you mentioned in SchemaRegistryClient class. Could you please share the repo link or share the pom dependency that I can use?
Thanks.
Kasam, Sai 0 Reputation points

2024-05-21T19:12:16.77+00:00
Hi @PRADEEPCHEEKATLA-MSFT Thanks for the response. This is the repo link and pom dependency

<dependency> <groupId>com.microsoft.azure</groupId> <artifactId>azure-schemaregistry-kafka-avro</artifactId> <version>1.1.1</version> </dependency>

that I had used to use the SchemaRegistryClient for java in my Spring Boot project.

I was not able to find the listSchemaVersions function in the SchemaRegistryClient . Could you please provide the link for the git repo or provide the pom dependency including the version number that I can use?
Thanks.
PRADEEPCHEEKATLA-MSFT 82,041 Reputation points Microsoft Employee

2024-05-22T08:19:45.19+00:00
@Kasam, Sai - I apologize for the confusion. The listSchemaVersions method is not available in the SchemaRegistryClient class of the azure-schemaregistry-kafka-avro library. It is only available in the azure-data-schemaregistry library.

Here is the Maven dependency for the azure-data-schemaregistry library:

<dependency> <groupId>com.azure</groupId> <artifactId>azure-data-schemaregistry</artifactId> <version>1.0.0-beta.3</version> </dependency>

And here is an example code snippet that uses the listSchemaVersions method:

SchemaRegistryClient schemaRegistryClient = new SchemaRegistryClientBuilder() .endpoint(endpoint) .credential(new DefaultAzureCredentialBuilder().build()) .buildClient(); List<Integer> schemaVersions = schemaRegistryClient.listSchemaVersions(schemaGroup, schemaName);

I hope this helps. Let me know if you have any further questions.
PRADEEPCHEEKATLA-MSFT 82,041 Reputation points Microsoft Employee

2024-05-29T08:03:50.8066667+00:00

@Kasam, Sai - We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

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How to retrieve all Schema Versions from a given Schema Group, Schema in EventHub.