EunSeop opened a new issue #15196: URL: https://github.com/apache/airflow/issues/15196
<!-- Welcome to Apache Airflow! For a smooth issue process, try to answer the following questions. Don't worry if they're not all applicable; just try to include what you can :-) If you need to include code snippets or logs, please put them in fenced code blocks. If they're super-long, please use the details tag like <details><summary>super-long log</summary> lots of stuff </details> Please delete these comment blocks before submitting the issue. --> <!-- IMPORTANT!!! PLEASE CHECK "SIMILAR TO X EXISTING ISSUES" OPTION IF VISIBLE NEXT TO "SUBMIT NEW ISSUE" BUTTON!!! PLEASE CHECK IF THIS ISSUE HAS BEEN REPORTED PREVIOUSLY USING SEARCH!!! Please complete the next sections or the issue will be closed. These questions are the first thing we need to know to understand the context. --> **Apache Airflow version**: 2.0.1 **Kubernetes version (if you are using kubernetes)** (use `kubectl version`): not used **Environment**: Mac os(Catalina) - **Cloud provider or hardware configuration**: - **OS** (e.g. from /etc/os-release): Mac os(Catalina) - **Kernel** (e.g. `uname -a`): `Darwin AL01590440.local 19.6.0 Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64 x86_64` - **Install tools**: pyenv, pip - **Others**: python 3.6.13 **What happened**: Example task of externaltasksensor doesn't work. `example_external_task_marker_child` is never success even I tried `example_external_task_marker_parent` at the same time. And finally, `example_external_task_marker_child` become failed due to timeout. **How to reproduce it**: - install python 3.6.13 using pyenv - install latest airflow(2.0.1) - setup db(default, maybe sqlite?), and add user, start scheduler, and run webserver - trigger `example_external_task_marker_child` and `example_external_task_marker_parent` at the same time, - Also tried `example_external_task_marker_parent` and `example_external_task_marker_child` but it shows same situation. <!--- As minimally and precisely as possible. Keep in mind we do not have access to your cluster or dags. If you are using kubernetes, please attempt to recreate the issue using minikube or kind. ## Install minikube/kind - Minikube https://minikube.sigs.k8s.io/docs/start/ - Kind https://kind.sigs.k8s.io/docs/user/quick-start/ If this is a UI bug, please provide a screenshot of the bug or a link to a youtube video of the bug in action You can include images using the .md style of  To record a screencast, mac users can use QuickTime and then create an unlisted youtube video with the resulting .mov file. --->  **Anything else we need to know**: Also had same situation in `CentOS Linux release 7.4.1708`. <!-- How often does this problem occur? Once? Every time etc? Any relevant logs to include? Put them here in side a detail tag: <details><summary>x.log</summary> lots of stuff </details> --> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
