Tzu-Li (Gordon) Tai created FLINK-9202:
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Summary: AvroSerializer should not be serializing the target Avro
type class
Key: FLINK-9202
URL: https://issues.apache.org/jira/browse/FLINK-9202
Project: Flink
Issue Type: Bug
Components: Type Serialization System
Reporter: Tzu-Li (Gordon) Tai
The {{AvroSerializer}} contains this field which is written when the serializer
is written into savepoints:
[https://github.com/apache/flink/blob/be7c89596a3b9cd8805a90aaf32336ec2759a1f7/flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/typeutils/AvroSerializer.java#L78]
This causes Avro schema evolution to not work properly, because Avro generated
classes have non-fixed serialVersionUIDs. Once a new Avro class is generated
with a new schema, that class can not be loaded on restore due to incompatible
UIDs, and thus the serializer can not be successfully deserialized.
A possible solution would be to only write the classname, and dynamically load
the class into a transient field.
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