Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2920
@StefanRRichter There is one change of semantics that would be good to get
your input on: A checkpoint stream to which a `byte[0]` array was written is
now actually empty and returns a `null` state handle in the same way as if
nothing was ever written. Before this change, it would have created a state of
zero bytes.
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