[GitHub] [airflow] kaxil edited a comment on issue #15369: Airflow 2.0 Scheduler suddenly stopped queuing tasks

Wed, 14 Apr 2021 12:08:10 -0700 


kaxil edited a comment on issue #15369:
URL: https://github.com/apache/airflow/issues/15369#issuecomment-819762980


   >:[2021-04-14 14:51:02,666] {{scheduler_job.py:1667}} INFO - DAG 
tool_statistic_dag already has 16 active runs, not queuing any tasks for run 
2021-04-14 12:20:00+00:00
   
   
   This is the underlying issue though, 
   
   
   Can you check the Airflow Webserver -> Admin -> Pools  and then in the row 
with your pool (`default_pool`) check the Used slots. And click on the number 
in Used slots, it should take you to the TaskInstance page that should show the 
currently "running" taskinstances in that Pool.
   
   It is possible that they are not actually running but somehow got in that 
state in DB. 
   
   
![image](https://user-images.githubusercontent.com/8811558/113708634-64508400-96d9-11eb-8505-2c293f0d2f44.png)
   
   
![image](https://user-images.githubusercontent.com/8811558/113708679-72060980-96d9-11eb-8c11-6c84a9c64801.png)
   


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