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https://issues.apache.org/jira/browse/AIRFLOW-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947910#comment-15947910
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Marty Woodlee commented on AIRFLOW-1026:
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I am having the same issue.
I believe this is happening because the Python {{ConfigParser}} behaves in an
additive/"merging" fashion when multiple configs are read, and at
https://github.com/apache/incubator-airflow/blob/1.8.0/airflow/configuration.py#L524,
the built-in {{DEFAULT_CONFIG}} is read before the user's _actual_ config is
loaded up at
https://github.com/apache/incubator-airflow/blob/1.8.0/airflow/configuration.py#L784.
Since the default config _does_ contain a {{sql_alchemy_conn}} entry (which
points to a local SQLite DB), the config code never tries to evaluate
{{sql_alchemy_conn_cmd}} since doing so takes lower precedence (see
https://github.com/apache/incubator-airflow/blob/1.8.0/airflow/configuration.py#L592-L605).
At first glance I'm not sure any of the {{\_cmd}} options have _ever_ worked?
My first instinct is that probably the {{DEFAULT_CONFIG}} should only ever get
read if it is known that there is no user-supplied config yet. May need
thought, though, if anyone is actually reliant upon that "fall-back" behavior?
(Let's hope not.)
> connection string using _cmd tin airflow.cfg is broken
> ------------------------------------------------------
>
> Key: AIRFLOW-1026
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1026
> Project: Apache Airflow
> Issue Type: Bug
> Components: configuration
> Affects Versions: Airflow 1.8
> Reporter: Harish Singh
> Priority: Critical
> Fix For: Airflow 1.8
>
>
> sql_alchemy_conn_cmd = python ./pipeline/dags/configure.py
> I am expectiing configure.py to be invoked.
> But it just throws:
> "cannot use sqlite with the LocalExecutor"
> The connection string that my script "configure.py" would return is something
> like this:
> mysql+mysqldb://username:**@mysqlhostname:3306/airflowdbname
> But after debugging, I found that, my script is not getting invoked at all.
> This is my airflow.cfg:
> executor = LocalExecutor
> sql_alchemy_conn_cmd = python ./pipeline/dags/configure.py
> sql_alchemy_pool_size = 5
> sql_alchemy_pool_recycle = 3600
> I tried not using the script and directly hardcoding the conn_url
> sql_alchemy_conn =
> mysql+mysqldb://username:**@mysqlhostname:3306/airflowdbname
> It works.
> But there is a regression bug if somebody wants to use "sql_alchemy_conn_cmd"
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