Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/3750
@fanyon yes that's the general idea. The problem is that if we just replace
the old `getSerializableListState` with new access state methods, the new
serializer and old serializer (which just uses plain Java object serialization)
will be incompatible.
So, we actually need to have a new registered state that is migrated from
the old one.
However, we're planning to have the functionality to convert state
serialization formats in Flink 1.4, so now I'm actually not entirely sure if we
want to do this "workaround migration with 2 registered states" solution now.
Please let me get back to you on this after I think about it ..
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