xBis7 commented on code in PR #71737:
URL: https://github.com/apache/airflow/pull/71737#discussion_r4392123155
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airflow-core/src/airflow/models/dagrun.py:
##########
@@ -1479,8 +1561,39 @@ def recalculate(self) -> _UnfinishedStates:
@provide_session
def task_instance_scheduling_decisions(self, *, session: Session =
NEW_SESSION) -> TISchedulingDecision:
- tis = self.get_task_instances(session=session, state=State.task_states)
- self.log.debug("number of tis tasks for %s: %s task(s)", self,
len(tis))
+ # Fetch finished task instances as lightweight read-only rows and only
the
+ # unfinished ones as full ORM objects. Finished ones are never mutated
during
+ # scheduling, so hydrating them is pure overhead.
+ #
+ # Flush here to avoid task instances ending up in the wrong list or in
both,
+ # in case of a pending in-session state change.
+ # The airflow session maker sets autoflush=False (ref
settings.configure_orm).
+ session.flush()
Review Comment:
I updated it. Now we check if there is any TI that is `new`, `dirty` or
`deleted` and only then we flush.
The query count went down as expected. From what I can this isn't getting
triggered today.
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