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  1. Flink
  2. FLINK-6801

PojoSerializerConfigSnapshot cannot deal with missing Pojo fields

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      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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            tzulitai Tzu-Li (Gordon) Tai
            trohrmann Till Rohrmann
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