[FLINK-27796] Document approaches to updating existing instances of stateful functions

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: statefun-3.2.0
• Component/s: Stateful Functions
• Assignee: Unassigned
• Reporter: Zixuan Rao
• Created: 26/May/22 05:03
• Updated: 26/May/22 05:03

Description

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.