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https://issues.apache.org/jira/browse/AIRFLOW-316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Davydov resolved AIRFLOW-316.
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Resolution: Fixed
> Always check DB state for Backfill Job execution
> ------------------------------------------------
>
> Key: AIRFLOW-316
> URL: https://issues.apache.org/jira/browse/AIRFLOW-316
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Dan Davydov
> Assignee: Dan Davydov
> Labels: backfill
>
> Always check DB state and not just the local state for backfill jobs for
> determining which task instances have not yet completed execution. This is to
> avoid potential race conditions with e.g. two backfill jobs running the same
> task instance.
> At Airbnb we have noticed a race condition with the subdag operator (which
> uses the backfill job) where all of the tasks in the subdag complete
> successfully, but the parent DAG is still waiting on a task in the subdag to
> succeed. Resolving this JIRA should fix the subdag operator.
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