Stop skipping none_failed_min_one_success tasks in mapped task groups - #69377
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A task with the none_failed_min_one_success trigger rule inside a dynamically mapped task group was evaluated on its not-yet-expanded summary task instance (map_index -1). At that point its upstream had already expanded to map indexes 0..n, so the summary evaluation found no relevant upstream successes and skipped the task before it could expand. Extend the "fast-triggered" set that gets broad depend-on-all-upstreams treatment on the unexpanded summary ti to include this rule, alongside the one_success/one_failed/one_done rules already handled there, so the task waits for its upstream and expands instead of skipping. closes: apache#39801
The issue's reproducer places the none_failed_min_one_success task in a plain task group nested inside the mapped one, so checking only the immediate parent group misses it and the task is still skipped before expansion. Check the closest mapped ancestor group instead.
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vincbeck
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Hi maintainer, this PR was merged without a milestone set.
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Backport successfully created: v3-3-testNote: As of Merging PRs targeted for Airflow 3.X In matter of doubt please ask in #release-management Slack channel.
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… task groups (apache#69377) (cherry picked from commit dd029a8) Co-authored-by: Shahar Epstein <60007259+shahar1@users.noreply.github.com>
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… task groups (apache#69377) (cherry picked from commit dd029a8) Co-authored-by: Shahar Epstein <60007259+shahar1@users.noreply.github.com>
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none_failed_min_one_successas fast triggered to avoid skipping before Dynamic Task Group is fully expanded.AI Summary
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A task whose trigger rule is `none_failed_min_one_success` and that lives inside a dynamically mapped task group was being **skipped before the task group expanded**, even though its upstream succeeded.The trigger rule is first evaluated on the task's not-yet-expanded summary task instance (
map_index -1). By that point the upstream inside the same group has already expanded tomap_index 0..n, so the summary-ti evaluation finds no relevant upstream successes, concludes "at least one success required, none found", and skips the task — it never expands.one_success/one_failed/one_donealready avoid this by being treated as "fast-triggered" on the unexpanded summary ti (they depend on all upstream instances until the group expands — see #34023 / #50210).none_failed_min_one_successbelongs in that same set: it can be satisfied by a subset of upstreams, so broad depend-on-all-upstreams counting on the summary ti is safe and lets the task expand normally. This PR adds it there.Reproduced on
main(3.4.0) with the issue's minimal Dag (tg.imawakeended upskippedatmap_index -1whiletg.imsleepyexpanded to0,1,2all success); with the fixtg.imawakeexpands to0,1,2and succeeds. Added a regression test that fails on the buggy code and passes with the fix.A prior attempt at this issue (#40428) was closed in 2024; this revives the fix scoped precisely to the affected trigger rule.
closes: #39801
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