Dear all, PIP-43 https://github.com/apache/pulsar/wiki/PIP-43%3A-producer-send-message-with-different-schema
introduced AUTO_PRODUCE_BYTES schema which allows the producer creates the schema while publishing messages. But there is a case that the producer with AUTO_PRODUCE_BYTES schema connects to the topic but has not published the message yet, so the topic does not have a schema. If a consumer tries to connect to the topic, we will get an exception https://github.com/apache/pulsar/blob/6704f12104219611164aa2bb5bbdfc929613f1bf/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/schema/SchemaRegistryServiceImpl.java#L293 And due to active producers connected to the topic, so the consumer is not able to upload schema. I think we should allow the consumer to upload schema in this case, the new message from the producer should meet compatibility requirements. It looks like schema creation compatibility check, The ones created first should be considered first, we do not need to reject the current schema to be created for the schema that may be created from the producer with AUTO_PRODUCE_BYTES schema Thanks, Penghui
