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Posted to commits@airflow.apache.org by GitBox <gi...@apache.org> on 2020/12/16 10:19:47 UTC

[GitHub] [airflow] MolochkoVitaly opened a new issue #13101: Incorrectly rendered graph

MolochkoVitaly opened a new issue #13101:
URL: https://github.com/apache/airflow/issues/13101


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   **Apache Airflow version**: 1.10.10
   
   **What happened**: 
   
   ```
   from airflow.operators.dummy_operator import DummyOperator
   from airflow import DAG
   from datetime import datetime
   
   
   default_args = {
       'start_date': datetime(2021, 1, 1),
       'owner': 'airflow'
   }
   
   
   dag = DAG('dummy_dag', default_args=default_args)
   
   op1 = DummyOperator(task_id="op1", dag=dag)
   op2 = DummyOperator(task_id="op2", dag=dag)
   op3 = DummyOperator(task_id="op3", dag=dag)
   op4 = DummyOperator(task_id="op4", dag=dag)
   op5 = DummyOperator(task_id="op5", dag=dag)
   
   
   op1 >> [op2, op3 >> op4] >> op5
   ```
   
   ![image](https://user-images.githubusercontent.com/11045746/102335030-6f539d00-3fa0-11eb-9b54-d5bfd79601e3.png)
   
   
   <!-- (please include exact error messages if you can) -->
   
   **What you expected to happen**: 
   
   ![image](https://user-images.githubusercontent.com/11045746/102335407-ea1cb800-3fa0-11eb-866d-74be8b2731c6.png)
   
   
   **How to reproduce it**:
   Run code above
   


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[GitHub] [airflow] MolochkoVitaly commented on issue #13101: Incorrectly rendered graph

Posted by GitBox <gi...@apache.org>.
MolochkoVitaly commented on issue #13101:
URL: https://github.com/apache/airflow/issues/13101#issuecomment-746173122


   Thanks for clarifying


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[GitHub] [airflow] boring-cyborg[bot] commented on issue #13101: Incorrectly rendered graph

Posted by GitBox <gi...@apache.org>.
boring-cyborg[bot] commented on issue #13101:
URL: https://github.com/apache/airflow/issues/13101#issuecomment-746043504


   Thanks for opening your first issue here! Be sure to follow the issue template!
   


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[GitHub] [airflow] ashb closed issue #13101: Incorrectly rendered graph

Posted by GitBox <gi...@apache.org>.
ashb closed issue #13101:
URL: https://github.com/apache/airflow/issues/13101


   


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[GitHub] [airflow] ashb commented on issue #13101: Incorrectly rendered graph

Posted by GitBox <gi...@apache.org>.
ashb commented on issue #13101:
URL: https://github.com/apache/airflow/issues/13101#issuecomment-746059692


   The issue is `op3 >> op4`. This expression returns the right hand side, so to expand out `op1 >> [op2, op3 >> op4] >> op5`, it is equivalent to:
   
   ```python
   op1 >> op2
   op3 >> op4
   op1 >> op4
   op2 >> op5
   op4 >> op5
   ```
   
   To get the structure you want you need to split it up a bit.
   
   
   ```python
   op1 >> [op2, op3]
   op3 >> op4
   op5 << [op2, op4]
   ```
   
   (I can't remember if you can do `[op2, op4] >> op5` or not.)


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