[jira] [Created] (FLINK-20264) Zero-downtime / dynamic function upgrades in Stateful Functions

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-20264:
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             Summary: Zero-downtime / dynamic function upgrades in Stateful Functions
                 Key: FLINK-20264
                 URL: https://issues.apache.org/jira/browse/FLINK-20264
             Project: Flink
          Issue Type: Task
          Components: Stateful Functions
            Reporter: Tzu-Li (Gordon) Tai
             Fix For: statefun-2.3.0


Currently, due to how functions can be executed as stateless deployments separate to the StateFun runtime, they can be easily upgraded with zero-downtime.

However, up to now there are still some restrictions to what can be done without restarting StateFun processes:

* Can't upgrade existing functions to declare new persisted state
* Can't add new functions to an existing StateFun application, and have messages routed to it

The end goal of this epic is to enable the above operations for function deployments, without the need to restart the StateFun runtime. Further details can be found in subtasks of this JIRA.



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