We have flaky scheduler test:


https://github.com/apache/airflow/pull/11659/checks?check_run_id=1279791496#step:6:527


_______________ TestSchedulerJob.test_scheduler_task_start_date ________________

self = <tests.jobs.test_scheduler_job.TestSchedulerJob testMethod=test_scheduler_task_start_date>

    def test_scheduler_task_start_date(self):
        """
        Test that the scheduler respects task start dates that are different from DAG start dates
        """
    
        dagbag = DagBag(dag_folder=os.path.join(settings.DAGS_FOLDER, "no_dags.py"), include_examples=False)
        dag_id = 'test_task_start_date_scheduling'
        dag = self.dagbag.get_dag(dag_id)
        dag.is_paused_upon_creation = False
        dagbag.bag_dag(dag=dag, root_dag=dag)
    
        # Deactivate other dags in this file so the scheduler doesn't waste time processing them
        other_dag = self.dagbag.get_dag('test_start_date_scheduling')
        other_dag.is_paused_upon_creation = True
        dagbag.bag_dag(dag=other_dag, root_dag=other_dag)
    
        dagbag.sync_to_db()
    
        scheduler = SchedulerJob(executor=self.null_exec,
                                 subdir=dag.fileloc,
                                 num_runs=2)
        scheduler.run()
    
        session = settings.Session()
        tiq = session.query(TaskInstance).filter(TaskInstance.dag_id == dag_id)
        ti1s = tiq.filter(TaskInstance.task_id == 'dummy1').all()
        ti2s = tiq.filter(TaskInstance.task_id == 'dummy2').all()
        self.assertEqual(len(ti1s), 0)
>       self.assertEqual(len(ti2s), 2)
E       AssertionError: 1 != 2
tests/jobs/test_scheduler_job.py
([20, 11, 11, 11], 1, 1, "1d", "@once", "linear"),  
            ([20, 21, 23, 25], 1, 1, "1d", "30m", "no_structure"),  
            ([20, 21, 23, 25], 1, 1, "1d", "30m", "linear"),  
            ([20, 21, 23, 25], 1, 1, "1d", "30m", "binary_tree"),  
            ([20, 21, 23, 25], 1, 1, "1d", "30m", "star"),  
            ([20, 21, 23, 25], 1, 1, "1d", "30m", "grid"),  
            
            ([8, 8, 8, 8], 1, 5, "1d", "None", "no_structure"),  
            ([8, 8, 8, 8], 1, 5, "1d", "None", "linear"),  
            ([20, 11, 11, 11], 1, 5, "1d", "@once", "no_structure"),  
            ([21, 12, 12, 12], 1, 5, "1d", "@once", "linear"),  
            ([20, 21, 23, 25], 1, 5, "1d", "30m", "no_structure"),  
            ([21, 23, 26, 29], 1, 5, "1d", "30m", "linear"),  
            ([21, 23, 26, 29], 1, 5, "1d", "30m", "binary_tree"),  
            ([21, 23, 26, 29], 1, 5, "1d", "30m", "star"),  
            ([21, 23, 26, 29], 1, 5, "1d", "30m", "grid"),  
            
            ([8, 8, 8, 8], 10, 10, "1d", "None", "no_structure"),  
            ([8, 8, 8, 8], 10, 10, "1d", "None", "linear"),  
            ([83, 26, 26, 26], 10, 10, "1d", "@once", "no_structure"),  
            ([93, 39, 39, 39], 10, 10, "1d", "@once", "linear"),  
            ([83, 87, 87, 87], 10, 10, "1d", "30m", "no_structure"),  
            ([93, 113, 113, 113], 10, 10, "1d", "30m", "linear"),  
            ([93, 107, 107, 107], 10, 10, "1d", "30m", "binary_tree"),  
            ([93, 107, 107, 107], 10, 10, "1d", "30m", "star"),  
            ([93, 107, 107, 107], 10, 10, "1d", "30m", "grid"),  
        ]
    )
    @pytest.mark.quarantined
    def test_process_dags_queries_count(