GitHub user shaealh added a comment to the discussion: Airflow task failed but 
spark kube app is running

@rcrchawla 
Try reducing pressure by decreasing the numbers of parallel tasks    [celery] 
worker_concurrency
You can also try increasing task_instance_heartbeat_timeout
If the issue still persists, let me know if we can reproduce this in a minimal 
environment I'd be happy to take a look 

GitHub link: 
https://github.com/apache/airflow/discussions/63298#discussioncomment-16092480

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