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Mohan Parthasarathy commented on SPARK-40659: --------------------------------------------- [~rangadi] A few clarifications. I am trying to understand the conditions under which the error is thrown. Using Confluent schema registry terminology, let's take a couple of examples: 1) BACKWARDS: Assuming the schema has evolved as per the rules, the consumer using the latest schema can read messages both from old and latest schema 2) FORWARDS: Similarly, the consumer using the older schema can read messages from a later schema; it would just ignore the new fields. In these cases, it will continue to work. Why would we throw error in these cases ? What other cases needs an error to be thrown ? Could you elaborate ? > 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 > Priority: Major > > 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. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org