dsuhinin opened a new pull request, #75304:
URL: https://github.com/apache/airflow/pull/75304
Backfill reprocessing currently works at whole-run granularity: `failed`
and `completed` recreate the entire run, so re running just the failed tasks of
a run — or running only tasks added in a newer Dag version — requires clearing
runs manually. This was possible in Airflow 2.x via task-regex backfills and
was lost in the 3.0 backfill redesign. This PR adds two task-level
`ReprocessBehavior` values, built on the existing `dag.clear(only_failed=...)`
/ `dag.clear(only_new=...)` primitives:
- **`failed_tasks`** — reprocesses failed runs like `failed`, but clears
only the failed (and upstream-failed) task instances instead of the whole run.
- **`new_tasks`** — reprocesses completed/failed runs, running only tasks
added in the latest Dag version; existing task instances are untouched and the
run moves to the latest Dag version.
<img width="925" height="840" alt="Screenshot 2026-10-21 at 13 37 01"
src="https://github.com/user-attachments/assets/97a2cdd9-80f0-4ce4-86df-abdbd7ecc06a";
/>
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