Add test to verify that apply after update should work with no conflict

[redbaron]

While investigating kubernetes/kubernetes#107417 , I found that at least at the level of structured merge diff, Apply doesn't cause conflict with Update if manager name is the same. This PR adds test for it.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: redbaron
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/lifecycle stale

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/lifecycle rotten

[redbaron]

/remove-lifecycle rotten

[apelisse]

/ok-to-test

That test should fail right?

[redbaron]

That test should fail right?

No, it should succeed

[apelisse]

Can you explain your rational?

[apelisse]

Sorry, I was in a meeting when I wrote that. Apply and Update have been implemented/designed as being incompatible because they don't have the same mechanisms of owning fields, which means that they can't be converted from one to another. I don't understand how this test passes.

[redbaron]

As described in the kubernetes/kubernetes#107417 Apply and Update are deliberately made incompatible in kube apiserver, which I didn't agree with. This test case demonstrates that, for the structured merge purposes these operations are not in conflict same field manager can use both without introducing conflict with it's own doings.

Kubernetes Apiserver introduces conflict between Apply and Update by adding operation name to the field manager string. So it is a higher level decision. Low level structured merging (which is this repo) is fully supporting both, hence this test.

[apelisse]

Ah yeah, you're right, smd doesn't differentiate and just overrides everything. Why don't you add more tests here to verify that the behavior would work as you expect? You can maybe convince me that this would be better?

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/lifecycle stale

[redbaron]

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

[apelisse]

I don't know what to do with this, I think we know this is how it works, but we don't rely on this behavior so I don't want to enforce that we keep it forever.
/close
We can re-open if we have stronger arguments.

[k8s-ci-robot]

@apelisse: Closed this PR.

In response to this:

I don't know what to do with this, I think we know this is how it works, but we don't rely on this behavior so I don't want to enforce that we keep it forever.
/close
We can re-open if we have stronger arguments.

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