[jira] [Commented] (AIRFLOW-78) airflow clear leaves dag_runs

["Wu Xiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-78?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15457747#comment-15457747 ] 

Wu Xiang commented on AIRFLOW-78:
---------------------------------

hi [~sanand], 

    This PR will prevent Airflow to process task instances for running DagRuns when max_active_dag_runs reached.

    This should be a bug, when max_active_dag_runs are reached, several things should still be processed,

    1) _process_task_instances for running dag runs
    2) manage_slas for running dag runs
    3) prevent generating new dag runs

    relative line of code:
    https://github.com/apache/incubator-airflow/blob/master/airflow/jobs.py#L1076

> airflow clear leaves dag_runs
> -----------------------------
>
>                 Key: AIRFLOW-78
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-78
>             Project: Apache Airflow
>          Issue Type: Wish
>          Components: cli
>    Affects Versions: Airflow 1.6.2
>            Reporter: Adrian Bridgett
>            Assignee: Norman Mu
>            Priority: Minor
>
> (moved from https://github.com/apache/incubator-airflow/issues/829)
> "airflow clear -c -d -s 2016-01-03 dagid"  doesn't clear the dagrun, it sets it to running instead (apparently since this is often used to re-run jobs).
> However this then breaks max_active_runs=1 (I have to stop the scheduler, then airflow clear, psql to delete the dagrun, then start the scheduler).
> This problem was probably seen on an Airflow 1.6.x install.



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