`AppDeploymentUpdateServiceInstanceWorkflow` is trying to update a service-instances without backing application or backing service.

[kvmw]

Consider a service definition foo with backing app foo-backing-app and a backing service foo-backing-service.

When a service-instance creation fails for any reason, there might be situations which we have the service-instance (in failed state) but the backing-app and/or backing-service has not been created. So even though service-definition says that every service-instance has a backing-app and a backing-service, there are service-instances without one or both of them. In this case any attempt to update/upgrade above service-instance will fail because AppDeploymentUpdateServiceInstanceWorkflow is not able to find the backing app or service.

This is especially troublesome when upgrade all services operations (batch). for example, when a new version of foo is available and we are trying to update all foo service-instances to the new version.

One way to solve this issue is by changing the AppDeploymentUpdateServiceInstanceWorkflow.accept method to reject service-instances without backing app or service (in failed state).

Another way would be handling the missing backing app / services gracefully during update.