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https://issues.apache.org/jira/browse/AIRFLOW-6360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17007912#comment-17007912
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ASF GitHub Bot commented on AIRFLOW-6360:
-----------------------------------------
tooptoop4 commented on pull request #7037: [AIRFLOW-6360] 'Recent tasks' stats
only show non-completed dagruns option
URL: https://github.com/apache/airflow/pull/7037
---
Link to JIRA issue: https://issues.apache.org/jira/browse/AIRFLOW-6360
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> config option to skip task_stats from getting completed dagruns/tis
> -------------------------------------------------------------------
>
> Key: AIRFLOW-6360
> URL: https://issues.apache.org/jira/browse/AIRFLOW-6360
> Project: Apache Airflow
> Issue Type: Improvement
> Components: ui
> Affects Versions: 1.10.6
> Reporter: t oo
> Assignee: t oo
> Priority: Major
>
> task_stats endpoint to display 'recent tasks' is very slow when someone has
> many dagruns or many tasks in a dag.
> BEFORE
> LastDagRun = (
> session.query(DagRun.dag_id,
> sqla.func.max(DagRun.execution_date).label('execution_date'))
> .join(Dag, Dag.dag_id == DagRun.dag_id)
> .filter(DagRun.state != State.RUNNING)
> .filter(Dag.is_active == True) # noqa: E712
> .filter(Dag.is_subdag == False) # noqa: E712
> .group_by(DagRun.dag_id)
> .subquery('last_dag_run')
> )
> RunningDagRun = (
> session.query(DagRun.dag_id, DagRun.execution_date)
> .join(Dag, Dag.dag_id == DagRun.dag_id)
> .filter(DagRun.state == State.RUNNING)
> .filter(Dag.is_active == True) # noqa: E712
> .filter(Dag.is_subdag == False) # noqa: E712
> .subquery('running_dag_run')
> )
> # Select all task_instances from active dag_runs.
> # If no dag_run is active, return task instances from most recent
> dag_run.
> LastTI = (
> session.query(TI.dag_id.label('dag_id'), TI.state.label('state'))
> .join(LastDagRun, and_(
> LastDagRun.c.dag_id == TI.dag_id,
> LastDagRun.c.execution_date == TI.execution_date))
> )
> RunningTI = (
> session.query(TI.dag_id.label('dag_id'), TI.state.label('state'))
> .join(RunningDagRun, and_(
> RunningDagRun.c.dag_id == TI.dag_id,
> RunningDagRun.c.execution_date == TI.execution_date))
> )
> UnionTI = union_all(LastTI, RunningTI).alias('union_ti')
> qry = (
> session.query(UnionTI.c.dag_id, UnionTI.c.state,
> sqla.func.count())
> .group_by(UnionTI.c.dag_id, UnionTI.c.state)
> )
> AFTER
> #we not interested in stats for dagruns already completed, only want active
> ones
> RunningDagRun = (
> session.query(DagRun.dag_id, DagRun.execution_date)
> .join(Dag, Dag.dag_id == DagRun.dag_id)
> .filter(DagRun.state == State.RUNNING,
> Dag.is_active,
> Dag.is_subdag == False) # noqa: E712
> .subquery('running_dag_run')
> )
> # Select all task_instances from active dag_runs.
> qry = (
> session.query(TI.dag_id.label('dag_id'), TI.state.label('state'),
> sqla.func.count())
> .join(RunningDagRun, and_(
> RunningDagRun.c.dag_id == TI.dag_id,
> RunningDagRun.c.execution_date == TI.execution_date))
> .group_by(TI.dag_id, TI.state)
> )
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