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https://issues.apache.org/jira/browse/AIRFLOW-932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890822#comment-15890822
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Dan Davydov commented on AIRFLOW-932:
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I'm still investigating and will update the ticket with more details as soon as
I am able to. My first guess is that the regex field of backfills makes Airflow
think that a task doesn't exist anymore if it's not included in the regex or
something like that.
This is a blocker because it overwrites existing task instances that were e.g.
successful with the removed state.
> 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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