Active/Archive management on Runs for Archived Experiment

What happened:

During the PR #5040, which allows user to see Active/Archive run lists of an experiment, regardless of whether that experiment is active or archived. There is discussion on whether a user can restore a Run from an Archived Experiment. See https://github.com/kubeflow/pipelines/pull/5040#issuecomment-773952554 for the initial question. And https://github.com/kubeflow/pipelines/pull/5040#issuecomment-774061658 for the argument. Currently this behavior is allowed on the latest code.

Decision Making

The question: Can a user restore a Run from an Archived Experiment? If so, what is the use case? If not, why it is discouraged?

Follow-up items

• If this behavior is allowed, should we update UI to call out the state of Experiment in ExperimentDetail.tsx file?
• If this behavior is not allowed, what is the error message we should show to users?

/kind discussion /area frontend

[difince]

Hi, @Bobgy and @StefanoFioravanzo can I work on number: 3?

backend: Check whether a run is under archived experiment when Unarchive API is called. If so, fail with error 400 (FAILED_PRECONDITION).

I will create a separate issue about this.

[StefanoFioravanzo]

I think the question is: “Should we allow Active Runs in Archived Experiments”?

If the answer was no, I can think of the following implications:

• Archiving an Experiment would imply archiving of ALL the Runs belonging to the Experiment. We could prompt users of course, saying that the Experiment archival will have this effect.
• Restoring an Experiment will restore ALL Runs belonging to the Experiment.

It is natural to me thinking about Experiments as direct parents (containers) of Runs, thus if I see an archived Experiment I would expect all of its runs to be Archived as well.

It’s clear that KFP follows a more loosely coupled approach. @Bobgy Was this a specific decision, taken at some point in time, grounded on some specific rationale? Maybe there is some old issue where this had been discussed.