Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/236#issuecomment-72434125
Dang, I see your point. We need something more clever then...
Can we (for now) at least make sure that it fails early: Get an exception
when registering a subtype of a pojo at the pojo serializer (in the pre-flight
phase)? And give a pointer to the flag that forces Kryo Serialization?
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