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https://issues.apache.org/jira/browse/AIRFLOW-4515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891073#comment-16891073
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David Lum commented on AIRFLOW-4515:
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Just to point out that your example actually should throw an error. This line
https://github.com/slocke716/test_subdags/blob/47defa649413a8c5bec9ac163df6875c9e75ac9c/dags/single_subdag.py#L22
should trigger this error to be thrown;
https://github.com/apache/airflow/blob/201faa20e204276f0e9b875c080ea5f1fc141571/airflow/executors/kubernetes_executor.py#L82
You should be passing a dictionary to the executor argument.
> KubernetesExecutor hangs in the subdag context
> ----------------------------------------------
>
> Key: AIRFLOW-4515
> URL: https://issues.apache.org/jira/browse/AIRFLOW-4515
> Project: Apache Airflow
> Issue Type: Bug
> Components: executors
> Affects Versions: 1.10.3
> Reporter: Steven Locke
> Assignee: Daniel Imberman
> Priority: Major
> Labels: kubernetes
>
> The bug is that when using the kubernetes executor in a k8s cluster and
> running a subdag with `executor=KubernetesExecutor()` the subdag never
> returns. Just runs infinitely. Here is an example repo
> https://github.com/slocke716/test_subdags
> This is occurring on 1.10.3 1.10.3post1 and 1.10.3b2 at least
> Not passing `executor=KubernetesExecutor()` into the subdag operator is not
> an option since it defaults to the SequentialExecutor and changing to the
> LocalExecutor causes thread errors because we require quite a bit of
> concurrency
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