m1racoli commented on PR #47326: URL: https://github.com/apache/airflow/pull/47326#issuecomment-2701218730
> I'm curious how noticeable the blockage on the async loop was though. Did you have a very noticeable issue that caused you to drill down and find this? I've been working with a customer. They have a DAG which kicks off up to 300 deferrable `EcsRunTaskOperator` tasks and they noticed significant performance degradation. We observed the log message ``` Triggerer's async thread was blocked for 8.11 seconds, likely by a badly-written trigger. Set PYTHONASYNCIODEBUG=1 to get more information on overrunning coroutines. ``` appearing 10-19 times per minute with values of 2-11 seconds. In particular the TaskDoneTrigger [instantiates 2 clients per run](https://github.com/apache/airflow/blob/4651ccce787b33af9ea03f43a876538d806ac68a/providers/amazon/src/airflow/providers/amazon/aws/triggers/ecs.py#L170-L171) (one each for EcsHook and AwsLogsHook). The triggerer basically was blocked for ten's of minutes while sequentially instantiating those async clients. -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
