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Deadline reference evaluation should receive the DagRun instead of dag_id/run_id

apache/airflow#70710·46930·Python·53 天未动·1 条评论·上游最近活跃 ·池内状态:可认领
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### Body Custom and built-in deadline references are evaluated via `evaluate_with(session=..., interval=..., dag_id=..., run_id=...)` at Dag run creation. The two identifiers exist only so the built-in references can pull the Dag run out of the database, but the caller already has it. `airflow-core/src/airflow/serialization/definitions/dag.py:764` has a TODO noting this (added in #58248): ```python # TODO : Pretty sure we can drop these last two; verify after testing is complete dag_id=self.dag_id, run_id=orm_dagrun.run_id, ``` `DagRunLogicalDateDeadline` and `DagRunQueuedAtDeadline` pass those straight to `_fetch_from_db` (serialization/definitions/deadline.py:361), which queries `SELECT <column> FROM dag_run WHERE dag_id = ? AND run_id = ?`. That is a query for a column of `orm_dagrun`, which is already loaded in the same session. `AverageRuntimeDeadline` genuinely needs to query historical runs, but it only needs `dag_id`, which is already available as `orm_dagrun.dag_id`. There is a second symptom. models/taskinstance.py:252 cannot use `evaluate_with()` at all: ``` # We can't use evaluate_with() since the new queued_at is not written to the DB yet. ``` and replicates the deadline recalculation instead. That is the DB-read approach failing where you would expect: the in-memory object is ahead of the database, so the `SELECT` returns stale data. Passing the object directly would let that code path use the normal evaluation logic. ### Proposal Pass the DagRun (or a small evaluation-context object) into `evaluate_with` instead of loose identifiers: - Built-in references read attributes directly; `_fetch_from_db` is no longer needed for the two DagRun references - One fewer query per DagRun-type deadline alert per Dag run creation - taskinstance.py can use `evaluate_with()` rather than duplicating it - A context object leaves room to expose more without another signature change ### Consequence for required_kwargs `required_kwargs` exists solely to declare which …
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