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Posted to commits@airflow.apache.org by "pierrejeambrun (via GitHub)" <gi...@apache.org> on 2025/07/08 12:00:20 UTC

[I] Grid loading issue when the dag structure changed [airflow]

pierrejeambrun opened a new issue, #53025:
URL: https://github.com/apache/airflow/issues/53025

   ### Body
   
   I was working on https://github.com/apache/airflow/issues/53002.
   
   Starting from the DAG:
   ```python
   from datetime import datetime
   
   from airflow import Dataset
   from airflow.decorators import dag
   from airflow.providers.standard.operators.python import BranchPythonOperator
   from airflow.providers.standard.operators.empty import EmptyOperator
   
   # these two will have downstream dags
   left = Dataset("left")
   right = Dataset("right")
   
   
   @dag(start_date=datetime(1970, 1, 1), schedule=None)
   def branch_empty():
       l = EmptyOperator(task_id="left", outlets=[left])
       c = EmptyOperator(task_id="center", outlets=[])
       r = EmptyOperator(task_id="right", outlets=[right])
       BranchPythonOperator(
           task_id="decide", python_callable=lambda: ["left", "center"]
       ) >> [l, c, r]
   
   
   branch_empty()
   ```
   
   Running the DAG.
   
   Then creating a new version with an additional task:
   ```
   from datetime import datetime
   
   from airflow import Dataset
   from airflow.decorators import dag
   from airflow.providers.standard.operators.empty import EmptyOperator
   from airflow.providers.standard.operators.python import BranchPythonOperator, PythonOperator
   
   # these two will have downstream dags
   left = Dataset("left")
   right = Dataset("right")
   
   
   @dag(start_date=datetime(1970, 1, 1), schedule=None)
   def branch_empty():
       l = EmptyOperator(task_id="left", outlets=[left])
       c = EmptyOperator(task_id="center", outlets=[])
       r = EmptyOperator(task_id="right", outlets=[right])
       rr = PythonOperator(task_id="right_right", outlets=[], python_callable=lambda: None)
       BranchPythonOperator(task_id="decide", python_callable=lambda: ["left", "center"]) >> [l, c, r, rr]
   
   
   branch_empty()
   ```
   
   Wait for the new version, refresh the UI, grid won't load anymore with error 500, and the server displaying:
   
   <img width="1889" height="933" alt="Image" src="https://github.com/user-attachments/assets/d10839ae-d8a3-4399-8e77-6161cdab6d50" />
   
   
   
   ### Committer
   
   - [x] I acknowledge that I am a maintainer/committer of the Apache Airflow project.


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Re: [I] Grid loading issue when the dag structure changed [airflow]

Posted by "pierrejeambrun (via GitHub)" <gi...@apache.org>.
pierrejeambrun commented on issue #53025:
URL: https://github.com/apache/airflow/issues/53025#issuecomment-3048658378

   @kaxil One more to watch, might affect current RCs if confirmed.


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Re: [I] Grid loading issue when the dag structure changed [airflow]

Posted by "pierrejeambrun (via GitHub)" <gi...@apache.org>.
pierrejeambrun commented on issue #53025:
URL: https://github.com/apache/airflow/issues/53025#issuecomment-3048779395

   Already fixed by https://github.com/apache/airflow/pull/52822, closing.


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Re: [I] Grid loading issue when the dag structure changed [airflow]

Posted by "pierrejeambrun (via GitHub)" <gi...@apache.org>.
pierrejeambrun commented on issue #53025:
URL: https://github.com/apache/airflow/issues/53025#issuecomment-3048647163

   This was working fine in `3.0.2`, I suspect this is caused by the recent Grid optimization / changes.
   
   cc: @dstandish 


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Re: [I] Grid loading issue when the dag structure changed [airflow]

Posted by "pierrejeambrun (via GitHub)" <gi...@apache.org>.
pierrejeambrun closed issue #53025: Grid loading issue when the dag structure changed
URL: https://github.com/apache/airflow/issues/53025


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