fuyi opened a new issue #8881: URL: https://github.com/apache/airflow/issues/8881
**Apache Airflow version**: 1.10.8 **Kubernetes version (if you are using kubernetes)** (use `kubectl version`): 1.17.5 **Environment**: - **Cloud provider or hardware configuration**: AWS - **OS** (e.g. from /etc/os-release): NAME="Ubuntu" VERSION="16.04.4 LTS (Xenial Xerus)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 16.04.4 LTS" VERSION_ID="16.04" HOME_URL="http://www.ubuntu.com/"; SUPPORT_URL="http://help.ubuntu.com/"; BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"; VERSION_CODENAME=xenial UBUNTU_CODENAME=xenial - **Kernel** (e.g. `uname -a`): Linux salt 4.4.0-1106-aws #117-Ubuntu SMP Wed Apr 8 09:52:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux - **Install tools**: - **Others**: **What happened**: In airflow.config file I have set the property **parallelism** to 50, which runs 50 tasks simultaneously. After turning on KubernetesExecutor, I notice there are many tasks pending in the "queue" status, and there are only maximal 25 tasks running at the same time. When I check airflow metric exported from statd, it shows that the metric "airflow_executor_running_tasks" hits its limit 50 already. see attachment.  **What you expected to happen**: parallelism 50 can run 50 tasks simultaneously when Kubernetes Executor is enabled. **How to reproduce it**: ---------------------------------------------------------------- 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]
