Github user StefanRRichter commented on the issue: https://github.com/apache/flink/pull/2533 @StephanEwen at least in the RocksDB backend we could remove user code completely. Right now, the only thing that needs to be serialized is the TypeSerializer from the ValueDescriptor. It is used in a check that users can not provide a descriptor with a different TypeSerializer than the one that was used initially. We might think about removing this to support versioning of TypeSerializers, but how can we somehow enforce compatibility between them?
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