Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2723
A quick info, before you jump into this: We cannot simply alter the
serializers right now, because that breaks the savepoint compatibility. There
are some first steps in the 1.2 release to help getting a serializer upgrade
path started, but that is still WIP.
BTW: This whole discussion is a good example of why we encourage to discuss
ideas first before jumping into implementation. Especially when they tough
runtime behavior.
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