Define a property to deserialize as generic record when specific record class not found

[emersonborges]

What was done:

• A new boolean property was created SPECIFIC_AVRO_READER_UNKNOWN_AS_GENERIC_CONFIG. When is true, if SPECIFIC_AVRO_READER_CONFIG is enabled, it will deserialize as generic record if specific record class was not found.
• Throwing an specific serialization exception class when specific record class not found ( SpecificRecordClassNotFound) to allow consumer to handle properly.

For more details: https://github.com/confluentinc/schema-registry/issues/791

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[emersonborges]

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[emersonborges]

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[mageshn]

@emersonborges Thanks a lot for the PR. I would like to understand a little bit more about the use-case/issue that you are trying to address here. Why would someone choose to configure to use a Specific Record but not have the appropriate class for it? This would help me take this PR forward.

[mageshn]

@emersonborges Just wanted to check to see if you had any updates on the question that I had regarding the context for this PR?

[mawek]

Hello guys - any update on this bug? It is kind of blocker for us since it happens all the time that there are new events that consumer don't care about, and currently there is no easy way around this since AbstractKafkaAvroDeserializer uses some package protected classes so it can't be easily subclassed and overridden.

[correacaio]

Hi everyone. We have the same issue here: our consumer, who only cares about specific events, always breaks when new events are added to the topic. It would be a great improvement if we could configure the deserializer to return a generic record instead of throwing a generic serialization exception. Can I help somehow to develop that feature?

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