[jira] [Created] (SPARK-40659) Schema evolution for protobuf (and Avro too?)

["Raghu Angadi (Jira)" <ji...@apache.org>]

Raghu Angadi created SPARK-40659:
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             Summary: Schema evolution for protobuf (and Avro too?)
                 Key: SPARK-40659
                 URL: https://issues.apache.org/jira/browse/SPARK-40659
             Project: Spark
          Issue Type: Improvement
          Components: Structured Streaming
    Affects Versions: 3.3.0
            Reporter: Raghu Angadi


Protobuf & Avro should support schema evolution in streaming. We need to throw a specific error message when we detect newer version of the the schema in schema registry.

A couple of options for detecting version change at runtime:
 * How do we detect newer version from schema registry? It is contacted only during planning currently.

 * We could detect version id in coming messages.

 ** What if the id in the incoming message is newer than what our schema-registry reports after the restart?

 *** This indicates delayed syncs between customers schema-registry servers (should be rare). We can keep erroring out until it is fixed.

 *** Make sure we log the schema id used during planning.



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