tzulitai edited a comment on issue #8570: [FLINK-12688] [state] Make serializer lazy initialization thread safe in StateDescriptor URL: https://github.com/apache/flink/pull/8570#issuecomment-497585843 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?
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