Till Rohrmann created FLINK-6801:
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Summary: PojoSerializerConfigSnapshot cannot deal with missing
Pojo fields
Key: FLINK-6801
URL: https://issues.apache.org/jira/browse/FLINK-6801
Project: Flink
Issue Type: Bug
Components: Type Serialization System
Affects Versions: 1.3.0, 1.4.0
Reporter: Till Rohrmann
The {{PojoSerializerConfigSnapshot}} tries to deserialize Pojo {{Fields}}. If
the underlying Pojo class changed such that a formerly present field is not
longer part of the Pojo, then the deserialization of the
{{PojoSerializerConfigSnapshot}} will fail. As a consequence of this failure,
there is no possibility to do state migration (e.g. skipping over this field
when reading old data).
I think it is better to simply store the field name in the
{{PojoSerializerConfigSnapshot}} and try to resolve the fields in the
{{PojoSerializer#ensureCompatibility}} method. That way it is possible to
construct a ConvertDeserializer allowing for state migration.
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