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https://issues.apache.org/jira/browse/AIRFLOW-1104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522831#comment-16522831
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Jakob Homan commented on AIRFLOW-1104:
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We should make some progress on this issue. If [~saguziel] isn't available to
comment, we should move forward with a patch. [~dfowler]'s approach seems
reasonable to me. Dan, want to spin up a patch for that and I'll review?
> 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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