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https://issues.apache.org/jira/browse/AIRFLOW-932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890810#comment-15890810
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Bolke de Bruin commented on AIRFLOW-932:
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verify_integrity in models.py is where you would like to look at. As mentioned
it sets a state to REMOVED if a task instance does not have a corresponding
task in a DAG. It is there for auditing and versioning reasons. Does it affect
running anything? A changed DAG cannot have a dependency on a non existent task.
> Backfills delete existing task instances and mark them as removed
> -----------------------------------------------------------------
>
> Key: AIRFLOW-932
> URL: https://issues.apache.org/jira/browse/AIRFLOW-932
> Project: Apache Airflow
> Issue Type: Sub-task
> Components: backfill
> Reporter: Dan Davydov
> Priority: Blocker
>
> I'm still investigating.
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