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https://issues.apache.org/jira/browse/KAFKA-9390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011427#comment-17011427
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Andy Bryant commented on KAFKA-9390:
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Also I'm using the 2.4 version of Kafka Streams with 5.3.2 version of confluent
serdes (since 5.4 isn't out)
> Non-key joining of KTable not compatible with confluent avro serdes
> -------------------------------------------------------------------
>
> Key: KAFKA-9390
> URL: https://issues.apache.org/jira/browse/KAFKA-9390
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.4.0
> Reporter: Andy Bryant
> Priority: Major
>
> I was trying out the new one-to-many KTable joins against some CDC data in
> Avro format and kept getting serialisation errors.
>
> {code:java}
> org.apache.kafka.common.errors.SerializationException: Error registering Avro
> schema:
> {"type":"record","name":"Key","namespace":"dbserver1.inventory.orders","fields":[
> {"name":"order_number","type":"int"}
> ],"connect.name":"dbserver1.inventory.orders.Key"}
> Caused by:
> io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException:
> Schema being registered is incompatible with an earlier schema; error code:
> 409
>
> {code}
> Both tables have avro keys of different types (one is an order key, the other
> a customer key).
> This looks like it will cause issues.
> [https://github.com/apache/kafka/blob/2.4/streams/src/main/java/org/apache/kafka/streams/kstream/internals/foreignkeyjoin/CombinedKeySchema.java#L57-L60]
> They will both attempt to register schemas with the same subject to the
> schema registry which will fail a backward compatibility check.
> I also noticed in the schema registry there were some subjects that didn't
> have the application id prefix. This is probably caused by this...
>
> [https://github.com/apache/kafka/blob/2.4/streams/src/main/java/org/apache/kafka/streams/kstream/internals/foreignkeyjoin/ForeignJoinSubscriptionSendProcessorSupplier.java#L88]
> Where here {{repartitionTopicName}} doesn't have the application prefix.
>
>
>
>
>
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