tweise opened a new pull request, #356:
URL: https://github.com/apache/flink-kubernetes-operator/pull/356
## What is the purpose of the change
Allow for upgrade of deployment with stateful upgrade mode that initially
fails due to a non-recoverable error, just like it would be the case when the
deployment ever reached stable spec.
## Brief change log
Check for presence of stable spec before executing logic that assumes
existing state.
## Verifying this change
Tested manually by creating deployments with image pull error for SAVEPOINT
and LAST_STATE upgrade modes. Verified that in either case spec update to valid
image is reconciled and deployment becomes stable.
TODO: add test case
## 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: (**yes**)
## Documentation
- Does this pull request introduce a new feature? (**no**)
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