Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5934
Concerning serializer snapshots:
- We need to move away from Java Serializing the serializers into the
config snapshots anyways and should do that in the near future.
- I think the config snapshot should be created once when the state is
created, encoded as `byte[]`, and then we only write the bytes. That safes us
from repeated work on every checkpoint and would also prevent concurrent access
to the serializer for creating the snapshot.
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