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https://issues.apache.org/jira/browse/AIRFLOW-678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Davydov resolved AIRFLOW-678.
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Resolution: Fixed
> Task instances can double-trigger
> ---------------------------------
>
> Key: AIRFLOW-678
> URL: https://issues.apache.org/jira/browse/AIRFLOW-678
> Project: Apache Airflow
> Issue Type: Bug
> Components: core
> Reporter: Dan Davydov
> Assignee: Dan Davydov
>
> At the moment there is no lock/synchronization around the loop where the
> scheduler puts tasks in the SCHEDULED state. This means that if somehow the
> task starts running or gets SCHEDULED somewhere else somehow (e.g. manually
> running a task via the webserver) the task can have it's state changed from
> RUNNING/QUEUED to SCHEDULED which can cause a single task instance to be run
> twice at the same time.
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