kaxil edited a comment on issue #13099:
URL: https://github.com/apache/airflow/issues/13099#issuecomment-767163927
> 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
> ```
I was not able to reproduce it with Postgres 9.6 and 12, haven't tried it
with 13.1
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