[jira] [Created] (AIRFLOW-1104) Concurrency check in scheduler should count queued tasks as well as running

["Alex Guziel (JIRA)" <ji...@apache.org>]

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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