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https://issues.apache.org/jira/browse/AIRFLOW-1104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16564331#comment-16564331
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ASF subversion and git services commented on AIRFLOW-1104:
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Commit ed972042a864cd010137190e0bbb1d25a9dcfe83 in incubator-airflow's branch
refs/heads/master from Dan Fowler
[ https://gitbox.apache.org/repos/asf?p=incubator-airflow.git;h=ed97204 ]
[AIRFLOW-1104] Update jobs.py so Airflow does not over schedule tasks (#3568)
This change will prevent tasks from getting scheduled and queued over
the concurrency limits set for the dag
> Concurrency check in scheduler should count queued tasks as well as running
> ---------------------------------------------------------------------------
>
> Key: AIRFLOW-1104
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1104
> Project: Apache Airflow
> Issue Type: Bug
> Environment: see https://github.com/apache/incubator-airflow/pull/2221
> "Tasks with the QUEUED state should also be counted below, but for now we
> cannot count them. This is because there is no guarantee that queued tasks in
> failed dagruns will or will not eventually run and queued tasks that will
> never run will consume slots and can stall a DAG. Once we can guarantee that
> all queued tasks in failed dagruns will never run (e.g. make sure that all
> running/newly queued TIs have running dagruns), then we can include QUEUED
> tasks here, with the constraint that they are in running dagruns."
> Reporter: Alex Guziel
> Priority: Minor
>
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