[GitHub] [airflow] kosteev commented on issue #18229: When I set wait_for_downstream=True, the task will not wait, and a failure will be reported

[GitBox]

kosteev commented on issue #18229:
URL: https://github.com/apache/airflow/issues/18229#issuecomment-920998071


   
![image](https://user-images.githubusercontent.com/1017130/133639089-3540cfdf-8cd4-4b5c-ad4f-2c8f3eee200b.png)
   After some testing it looks like the issue is in mini scheduler running in 
worker. So, somehow mini scheduler schedules a task that shouldn't be scheduled 
as it doesn't meet all dependency requirements (wait_for_downstream=True), and 
then it fails during start of execution because of it.
   
   If I disable mini scheduler [scheduler]schedule_after_task_execution=False 
the issue is not reproduced anymore.
   This is screenshot when mini scheduler disabled:
   
![image](https://user-images.githubusercontent.com/1017130/133639242-d069f8bc-813b-4f3d-b563-63d6b847aa1e.png)
   
   CC: @ashb 


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