Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3534
This change may alter the format of savepoints, because it now forwards
type-registrations to the Kryo serializer, which it did not do before.
Since we announced savepoint compatibility, we need to understand when this
would happen. Is it something that could not really happen before (because
whenever the method was called, the serializer was properly initialized
outside), or did this actually occur in some cases?
@sunjincheng121 Can you share how you stumbled across this bug? Was it a
code cleanup, or a bug you encountered while running Flink?
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