On 2019/01/27 12:54:18, airflowuser <airflowu...@protonmail.com.INVALID> wrote:
> Apparently dot - "." is a reserved char for sub-dags.
> See here: https://issues.apache.org/jira/browse/AIRFLOW-3292
> I didn't know that, nor the author of this ticket (I assume others also don't
> know that as it isn't listed in the docs)
> Reserve words/chars is something that is pretty fundamental.
> Shouldn't Airflow prevent from users to use chars/words that may cause
> problems ?
I've also been bitten by invalid characters thing
[earlier](https://stackoverflow.com/a/51103180/3679900) (though mine was with
task_id and not dag_id). I agree that this fine detail is missing in the docs
and I had do do a fair bit of digging through to code to arrive at
[airflow/utils/helpers.py](https://github.com/apache/airflow/blob/v1-10-stable/airflow/utils/helpers.py#L58)
Particularly regarding SubDags, the dot '.' character limitation seems
inhibiting, and extending SubDagOperator to do away with [this
check](https://github.com/apache/airflow/blob/v1-10-stable/airflow/operators/subdag_operator.py#L61)
might have worked if it weren't for [this
check](https://github.com/apache/airflow/blob/v1-10-stable/airflow/models.py#L3820),
which isn't going away till Airflow 2.0
Also see [How to extend
SubDagOperator?](https://stackoverflow.com/questions/42256675/)
