[jira] [Created] (AIRFLOW-1857) Tree View in Web UI shows all DAGRuns for Dags with execution interval @once or None

["Mark Whitfield (JIRA)" <ji...@apache.org>]

Mark Whitfield created AIRFLOW-1857:
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             Summary: Tree View in Web UI shows all DAGRuns for Dags with execution interval @once or None
                 Key: AIRFLOW-1857
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1857
             Project: Apache Airflow
          Issue Type: Bug
          Components: ui, webserver
            Reporter: Mark Whitfield
            Priority: Minor


The DAG's tree view in the web UI relies on the DAG's [execution interval|https://github.com/apache/incubator-airflow/blob/master/airflow/www/views.py#L1178-L1189] to limit the number of DAG runs displayed. For DAGs with intervals `@once` or `None` this falls back on the default of displayiing *all* historical runs of the DAG (back to 2000, anyway).

I have use cases (and believe others do too) involving DAGs which are run exclusively by manual triggering, whether through the UI, API call, or TriggerDagRunOperator. For long-lived DAGs of this kind, the UI ends up displaying hundreds of runs, which is not only slow to load and cumbersome to navigate, but after a while will begin to crash the (containerized, resource-limited) webserver.



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