schongloo opened a new pull request, #969:
URL: https://github.com/apache/flink-kubernetes-operator/pull/969
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## What is the purpose of the change
This pull request adds basic support for Blue/Green deployments as outlined
by FLIP-503
(https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=337677648).
## Brief change log
- A new `FlinkBlueGreenDeploymentController` controller, with the
capability of managing the lifecycle of these deployments.
- A new corresponding CRD is introduced
- The new `FlinkBlueGreenDeploymentController` will manage this CRD and
hide from the user the details of the actual Blue/Green (Active/StandBy) jobs.
- Delegate the lifecycle of the actual Jobs to the existing
`FlinkDeployment` controller.
## Verifying this change
- Test to verify a single basic deployment
- Test to verify a proper transition Blue -> Green
- Test to verify correct behavior when encountering an error before a
transition
- Test to verify correct behavior when encountering an error during a
transition
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changes to the `CustomResourceDescriptors`:
no
- Core observer or reconciler logic that is regularly executed: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? docs / JavaDocs. UML diagrams for
all scenarios added under `docs/content/docs`
### Overview Diagram
<img width="3853" height="3182" alt="image"
src="https://github.com/user-attachments/assets/9a02450a-ef88-4032-a301-0a7032908851";
/>
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