carp84 commented on issue #8570: [FLINK-12688] [state] Make serializer lazy initialization thread safe in StateDescriptor URL: https://github.com/apache/flink/pull/8570#issuecomment-497619270 > One slight clarification regarding a comment that was mentioned in the description: > > ``` > The change here assures only one single serializer instance will be returned by StateDescriptor.getSerializer after lazy initialization while previously no such assurance. > ``` > > If I understood this correctly, this should be incorrect. `getSerializer` always creates a duplicate of the wrapped serializer. This is required since `TypeSerializer` isn't thread-safe. > So, with this change, the returned serializer is still always a duplicate, but the one maintained within `StateDescriptor` is a singleton. > > @carp84 can you confirm this? Correct, I meant the original serializer will be a singleton. Let me update the description.
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