[GitHub] [airflow] JCoder01 edited a comment on issue #13099: Unable to start scheduler after stopped

[GitBox <gi...@apache.org>]

JCoder01 edited a comment on issue #13099:
URL: https://github.com/apache/airflow/issues/13099#issuecomment-754589174


   Happy New Year @ashb 
   There is a little bit of both. There is an outstanding issue where use of Variables (or probably anything that interacts with the backed db in the global scope) in a plugin raises the `UNEXPECTED COMMIT` RunTime error. 
   The problem I reported with being unable to restart the scheduler seems to have been caused by wrapping my `Variable.get` in an overly generous try/except, hiding the run time error and causing things in the db to get out of sync.
   Running the below should recreate the issue, I did this on python 3.7
   ```
   mkdir airflow_scheduler_test
   cd airflow_scheduler_test
   export AIRFLOW_HOME=$(pwd)
   virtualenv pyenv 
   source pyenv/bin/activate
   pip install apache-airflow==2.0.0
   
   airflow db init
   airflow variables set test TEST
   mkdir plugins
   cat << EOF > plugins/test.py
   from airflow.models.variable import Variable
   
   print(Variable.get('test'))
   EOF
   
   airflow dags unpause example_bash_operator
   airflow scheduler
   ```


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