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Prevent bug when launching apps on multiple clusters #15226

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luca3rd
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@luca3rd luca3rd commented Oct 20, 2022

What does this PR do?

Stops a bug when cross-launching an app between clusters.

Currently the platform does not allow running multiple app instances. If you have app-1 running on cluster-1 and try to run it on cluster-2, the CLI will succeed but the app will never start.

This PR prevents this disconnect. The app should not be uploaded / released if it won't run. An error is presented to the user explaining what happened and how to proceed (specify a different --name: e.g. app-2).

Once the platform supports multiple app instances / running individual apps on multiple clusters, this PR can be reverted.

Does your PR introduce any breaking changes? If yes, please list them.

No

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  • Did you write any new necessary tests? (not for typos and docs)
  • Did you verify new and existing tests pass locally with your changes?
  • Did you list all the breaking changes introduced by this pull request?
  • Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

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Anyone in the community is welcome to review the PR.
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Did you have fun?

Make sure you had fun coding 🙃

cc @Borda

@github-actions github-actions bot added the app (removed) Generic label for Lightning App package label Oct 20, 2022
@luca3rd luca3rd self-assigned this Oct 20, 2022
@luca3rd luca3rd force-pushed the ENG-497-bug]-can-t-run-app-on-a-cluster-if-it-already-run-in-another branch from c67aed8 to b0fb647 Compare October 20, 2022 19:21
@luca3rd luca3rd changed the title Error instead of breaking Prevent unsupported behaviour when launching apps on multiple clusters Oct 20, 2022
@luca3rd luca3rd changed the title Prevent unsupported behaviour when launching apps on multiple clusters Prevent bug when launching apps on multiple clusters Oct 20, 2022
@luca3rd luca3rd marked this pull request as ready for review October 20, 2022 20:15
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@awaelchli awaelchli left a comment

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Looks great

src/lightning_app/runners/cloud.py Outdated Show resolved Hide resolved
@awaelchli awaelchli added this to the v1.8.x milestone Oct 21, 2022
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Let's also add a changelog entry in src/lightning_app/changelog.md?

@mergify mergify bot added the ready PRs ready to be merged label Oct 24, 2022
@luca3rd luca3rd enabled auto-merge (squash) October 24, 2022 16:54
@luca3rd luca3rd merged commit 488c2ac into master Oct 25, 2022
@luca3rd luca3rd deleted the ENG-497-bug]-can-t-run-app-on-a-cluster-if-it-already-run-in-another branch October 25, 2022 23:36
@carmocca carmocca removed this from the v1.8.x milestone Oct 26, 2022
@carmocca carmocca added this to the v1.8 milestone Oct 26, 2022
@@ -305,6 +292,15 @@ def dispatch(

if find_instances_resp.lightningapps:
existing_instance = find_instances_resp.lightningapps[0]

# TODO: support multiple instances / 1 instance per cluster
if existing_instance.spec.cluster_id != cluster_id:
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@luca3rd I am confused about this. If the app already exists on a cluster, than it means the user is going to restart it when a new release.

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7 participants