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https://issues.apache.org/jira/browse/FLINK-6801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai reassigned FLINK-6801:
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Assignee: Tzu-Li (Gordon) Tai
> 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
> Assignee: Tzu-Li (Gordon) Tai
>
> 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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