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https://issues.apache.org/jira/browse/AIRFLOW-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16852474#comment-16852474
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Palanieppan Muthiah commented on AIRFLOW-4715:
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Looks like this is duplicate of [https://github.com/apache/airflow/pull/4082].
So closing this.
> On success callback on task does not run reliably
> -------------------------------------------------
>
> Key: AIRFLOW-4715
> URL: https://issues.apache.org/jira/browse/AIRFLOW-4715
> Project: Apache Airflow
> Issue Type: Bug
> Components: DAG
> Affects Versions: 1.10.1
> Reporter: Palanieppan Muthiah
> Priority: Minor
>
> When a task succeeds, the on_success_callback is only called after the task
> state is set to success. If the success_callback runs long enough, the task
> heartbeat process finds the task state is already success and kills itself,
> disrupting the long running success_callback.
> On the other hand, in the case of failure, the on_failure_callback is called
> first before the state is set to failed.
> It seems the correct behavior is that the success callback is called first,
> and then state is set to success (regardless of any error in the
> success_callback).
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