Alex Guziel created AIRFLOW-1104:
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Summary: 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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