[jira] [Commented] (AIRFLOW-4833) Jinja templating removes newlines

["Galak (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-4833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16916714#comment-16916714 ] 

Galak commented on AIRFLOW-4833:
--------------------------------

the dag additional attribute will actually be called {{jinja_environment_kwargs}}.

It gives something like:
{code:python}
DAG(dag_id='my-dag',
    jinja_environment_kwargs={
        'keep_trailing_newline': True,
        # some other jinja2 Environment options here
    }){code}
see this [thread on slack|https://apache-airflow.slack.com/archives/CCPRP7943/p1566908457361800] for more information.

 

> Jinja templating removes newlines
> ---------------------------------
>
>                 Key: AIRFLOW-4833
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-4833
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: operators
>    Affects Versions: 1.10.2
>            Reporter: Francesco Macagno
>            Assignee: Galak
>            Priority: Minor
>
> When using an operator that has Jinja templating enabled for a field, if the field value ends with a newline then the newline is removed, regardless of whether there was a template in the string.
>  
> This came up when attempting to send data to Prometheus pushgateway using the SimpleHttpOperator. Pushgateway requires a newline at the end of every entry, so the removal of the newline at the end of the data parameter causes the request to fail in a way that is difficult to debug.
>  
> This can be gotten around by including a space after the newline character, though this is not a great solution. The space is ignored by pushgateway.



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