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https://issues.apache.org/jira/browse/AIRFLOW-6524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17013024#comment-17013024
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t oo commented on AIRFLOW-6524:
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it doesn't, none of the tasks get into running state
> Make trigger_dag & clear CLIs throw an error if 'shape' of dag has changed
> since prior dagrun
> ---------------------------------------------------------------------------------------------
>
> Key: AIRFLOW-6524
> URL: https://issues.apache.org/jira/browse/AIRFLOW-6524
> Project: Apache Airflow
> Issue Type: Improvement
> Components: cli, scheduler
> Affects Versions: 1.10.7
> Reporter: t oo
> Priority: Trivial
>
> if DagA had 20 tasks on first exec_date but then DagA code was changed and
> had a different 15 or 25 tasks on second exec_date the scheduler will never
> run it. The CLI's for trigger_dag & clear should throw error right away to
> make it clear early that the Dagrun will never succeed.
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