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[core] Add generic __ray_ready__ method to Actor classes #31997

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merged 3 commits into from
Jan 30, 2023

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@krfricke krfricke commented Jan 27, 2023

Signed-off-by: Kai Fricke kai@anyscale.com

Why are these changes needed?

We currently have no canonical way to await actors. Users can define their own is-ready methods, schedule a future, and await these, but this has to be done for every actor class separately.

This does not match other patterns - e.g. we have actor.__ray_terminate__.remote() for actor termination and placement_group.ready() for placement group ready futures.

This PR adds a new __ray_ready__ magic actor method that just returns True. It can be used to await actors becoming ready (newly scheduled actors), and actors having processed all of their other enqueued tasks.

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  • I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
  • I've run scripts/format.sh to lint the changes in this PR.
  • I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
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    • This PR is not tested :(

Signed-off-by: Kai Fricke <kai@anyscale.com>
@krfricke krfricke requested a review from ericl January 27, 2023 17:02
@ericl ericl added the core-interface-change-approval-required This changes the Ray core behavior / API and requires broader approvals. label Jan 27, 2023
Signed-off-by: Kai Fricke <kai@anyscale.com>
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Could you update the related docs?

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@jjyao __ray_terminate__ is also not documented - is this something we want to expose more broadly?

@krfricke krfricke requested a review from pcmoritz January 30, 2023 18:50
@krfricke krfricke merged commit fe729aa into ray-project:master Jan 30, 2023
@krfricke krfricke deleted the core/ray-active branch January 30, 2023 22:07
clarng pushed a commit to clarng/ray that referenced this pull request Jan 31, 2023
…ct#31997)

We currently have no canonical way to await actors. Users can define their own _is-ready_ methods, schedule a future, and await these, but this has to be done for every actor class separately.

This does not match other patterns - e.g. we have `actor.__ray_terminate__.remote()` for actor termination and `placement_group.ready()` for placement group ready futures.

This PR adds a new `__ray_ready__` magic actor method that just returns `True`. It can be used to await actors becoming ready (newly scheduled actors), and actors having processed all of their other enqueued tasks.

Signed-off-by: Kai Fricke <kai@anyscale.com>
edoakes pushed a commit to edoakes/ray that referenced this pull request Mar 22, 2023
…ct#31997)

We currently have no canonical way to await actors. Users can define their own _is-ready_ methods, schedule a future, and await these, but this has to be done for every actor class separately.

This does not match other patterns - e.g. we have `actor.__ray_terminate__.remote()` for actor termination and `placement_group.ready()` for placement group ready futures.

This PR adds a new `__ray_ready__` magic actor method that just returns `True`. It can be used to await actors becoming ready (newly scheduled actors), and actors having processed all of their other enqueued tasks.

Signed-off-by: Kai Fricke <kai@anyscale.com>
Signed-off-by: Edward Oakes <ed.nmi.oakes@gmail.com>
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4 participants