[jira] [Created] (FLINK-11771) Serializer snapshot cannot be read if directly upgraded in-place to a TypeSerializerSnapshot from a TypeSerializerConfigSnapshot written in 1.7+

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-11771:
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             Summary: Serializer snapshot cannot be read if directly upgraded in-place to a TypeSerializerSnapshot from a TypeSerializerConfigSnapshot written in 1.7+
                 Key: FLINK-11771
                 URL: https://issues.apache.org/jira/browse/FLINK-11771
             Project: Flink
          Issue Type: Improvement
          Components: API / Type Serialization System
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai
             Fix For: 1.8.0


This is a upgrade path that was overlooked in {{TypeSerializerSnapshot#readVersionedSnapshot}}.

If the serializer snapshot was a {{TypeSerializerConfigSnapshot}} when it was written in 1.7+ Flink versions, the actual snapshot content will be prefixed by a magic {{TypeSerializerConfigSnapshot#ADAPTER_VERSION}} int as the snapshot version, as well as Java-serialized prior serializer.

If when restoring, the serializer snapshot was upgraded in-place to a {{TypeSerializerSnapshot}},
{{TypeSerializerSnapshot#readVersionedSnapshot}} doesn't work as expected.
Firstly, the provided {{readVersion}} to the user-implemented {{TypeSerializerSnapshot#readSnapshot}} method would be the magic {{ADAPTER_VERSION}}.
Secondly, the remaining stream would contain the Java-serialized prior serializer, which is no longer for the user (because they already upgraded to the new abstraction).



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