Github user StefanRRichter commented on the issue: https://github.com/apache/flink/pull/3834 I was already familiar with the high level design of this PR from my discussions with @tzulitai. As the feature freeze is already tomorrow, I had to focus my review on the functionality of the design (i.e. if all cases in backwards compatibility that we want to cover are possible and future plans like state transformation can base upon this work). I also had a look into a couple of important tests, but could not go through all the implementation details for now. Overall, I think this is very good work and improves a ton of things w.r.t. everything that has to do with serialization format updates and backwards compatibility. I suggest that we proceed to merge this, so that the code makes it into the release. We can still do potential refinements and fixes in the QA phase, in case they are needed. @tzulitai if you agree, please feel free to merge this. +1
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