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https://issues.apache.org/jira/browse/AIRFLOW-679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Guziel resolved AIRFLOW-679.
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Resolution: Fixed
> Stop concurrent task instances from running due to race conditions
> ------------------------------------------------------------------
>
> Key: AIRFLOW-679
> URL: https://issues.apache.org/jira/browse/AIRFLOW-679
> Project: Apache Airflow
> Issue Type: Improvement
> Components: core
> Reporter: Alex Guziel
> Assignee: Alex Guziel
> Priority: Minor
>
> Right now, multiple copies of the same task instance can run if someone
> clicks on the UI multiple times. To fix this, I propose two things:
> 1) record hostname and pid in TaskInstance table, then when heartbeating,
> only continue running if it matches
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