kaxil commented on a change in pull request #17945:
URL: https://github.com/apache/airflow/pull/17945#discussion_r700920851
##########
File path: airflow/jobs/scheduler_job.py
##########
@@ -970,48 +971,61 @@ def _start_queued_dagruns(
session: Session,
) -> int:
"""Find DagRuns in queued state and decide moving them to running
state"""
- dag_runs = self._get_next_dagruns_to_examine(State.QUEUED, session)
-
- active_runs_of_dags = defaultdict(
- lambda: 0,
- session.query(DagRun.dag_id, func.count('*'))
- .filter( # We use `list` here because SQLA doesn't accept a set
- # We use set to avoid duplicate dag_ids
- DagRun.dag_id.in_(list({dr.dag_id for dr in dag_runs})),
- DagRun.state == State.RUNNING,
- )
- .group_by(DagRun.dag_id)
- .all(),
+ active_dags = (
+ session.query(DM)
+ .filter(DM.is_active == expression.true(), DM.is_paused ==
expression.false())
+ .all()
)
+ max_number = conf.getint('scheduler',
'max_dagruns_per_loop_to_schedule', fallback=20)
+ # There's a possibility of exceeding this max_number or going below it
as a result of the logic below
+ if len(active_dags) > max_number:
+ max_number = 1
+ elif len(active_dags) > 0:
Review comment:
Why 1? I don't get this logic
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