[jira] [Created] (FLINK-9574) Add a dedicated documentation page for state evolution

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-9574:
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             Summary: Add a dedicated documentation page for state evolution
                 Key: FLINK-9574
                 URL: https://issues.apache.org/jira/browse/FLINK-9574
             Project: Flink
          Issue Type: Improvement
          Components: Documentation, State Backends, Checkpointing, Type Serialization System
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai


Currently, the only bit of documentation about serializer upgrades / state evolution, is [https://ci.apache.org/projects/flink/flink-docs-release-1.5/dev/stream/state/custom_serialization.html#handling-serializer-upgrades-and-compatibility.], which only explains things at an API level.

State evolution over the time has proved to be a rather complex topic that is often overlooked by users. Users would probably benefit from a actual full-grown dedicated page that covers both API, and a some necessary internal details regarding the interplay of the outdated serializer, restore serializer, and new registered serializer of states.

I propose to add this documentation as a subpage under Streaming/State & Fault-Tolerance/.



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