[jira] [Created] (FLINK-27796) Document approaches to updating existing instances of stateful functions

["Zixuan Rao (Jira)" <ji...@apache.org>]

Zixuan Rao created FLINK-27796:
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             Summary: Document approaches to updating existing instances of stateful functions
                 Key: FLINK-27796
                 URL: https://issues.apache.org/jira/browse/FLINK-27796
             Project: Flink
          Issue Type: Improvement
          Components: Stateful Functions
    Affects Versions: statefun-3.2.0
            Reporter: Zixuan Rao


As a startup company utilizing stateful functions, we often meet the needs to modify our applications after it is deployed. Some documentation on the best practice / methods of upgrading the application would be helpful.

 

For version 3.2, it seems to me that merely changing an ingress configuration in `module.yaml` and restart deployment related to statefun would break the running application. After I recovered the ingress definition to previoius version, the checkpoint restore was successful. I think that it is necessary to have a Quick Reference / Guide on how to upgrade, and which configurations should be considered immutable. 

 

A documentation from the maintainer would obviously be preferred. I could also write a skeleton that includes some of my tried-and-true approaches, so that the community can build on top of it by correcting some of the mistakes in my approach.

 

Let me know how I can be of help, or if there are other documents I can refer to.

 

Thank you.



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