[jira] [Created] (FLINK-6800) PojoSerializer ignores added pojo fields

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-6800:
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             Summary: PojoSerializer ignores added pojo fields
                 Key: FLINK-6800
                 URL: https://issues.apache.org/jira/browse/FLINK-6800
             Project: Flink
          Issue Type: Bug
          Components: Type Serialization System
    Affects Versions: 1.3.0, 1.4.0
            Reporter: Till Rohrmann


The {{PojoSerializer}} contains a list of pojo fields which are represented as {{Field}} instances. Upon serialization the names of these fields are serialized. When being deserialized these names are used to look up the respective {{Fields}} of a dynamically loaded class. If the dynamically loaded class has additional fields (compared to when the serializer was serialized), then these fields will be ignored (for the read and for the write path). While this is necessary to read stored data, it is dangerous when writing new data, because all newly added fields won't be serialized. This subtleness is really hard to detect for the user. Therefore, I think we should eagerly fail if the newly loaded type contains new fields which haven't been present before.



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