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https://issues.apache.org/jira/browse/AIRFLOW-2843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16745315#comment-16745315
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ASF GitHub Bot commented on AIRFLOW-2843:
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feng-tao commented on pull request #4547: [AIRFLOW-2843] Add flag in
ExternalTaskSensor to check if external DAG/task exists
URL: https://github.com/apache/airflow/pull/4547
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> ExternalTaskSensor: Add option to cease waiting immediately if the external
> DAG/task doesn't exist
> --------------------------------------------------------------------------------------------------
>
> Key: AIRFLOW-2843
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2843
> Project: Apache Airflow
> Issue Type: Improvement
> Components: operators
> Reporter: Xiaodong DENG
> Assignee: Xiaodong DENG
> Priority: Minor
>
> h2. Background
> *ExternalTaskSensor* will keep waiting (given restrictions of retries,
> poke_interval, etc), even if the external DAG/task specified doesn't exist at
> all. In some cases, this waiting may still make sense as new DAG may backfill.
> But it may be good to provide an option to cease waiting immediately if the
> external DAG/task specified doesn't exist.
> h2. Proposal
> Provide an argument "check_existence". Set to *True* to check if the external
> DAG/task exists, and immediately cease waiting if the external DAG/task does
> not exist.
> The default value is set to *False* (no check or ceasing will happen) so it
> will not affect any existing DAGs or user expectation.
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