airflow: task failed with a null hostname

Apache Airflow version: 2.0.0

Kubernetes version (if you are using kubernetes) (use kubectl version):

Environment:

• Cloud provider or hardware configuration: tencent cloud
• OS (e.g. from /etc/os-release): centos7
• Kernel (e.g. uname -a): 3.10
• Install tools:
• Others: Server version: 8.0.22 MySQL Community Server - GPL

What happened:

Task is in the failed state. I found the log file on one of the worker node and the task is actually success. And in the task instance details tab, the hostname field is null.

And the logs are as follows:

*** Log file does not exist: /data/app/epic-airflow/logs/tiny_demo80677608236/task_0/2021-01-15T09:04:00+00:00/1.log
*** Fetching from: http://:8793/log/tiny_demo80677608236/task_0/2021-01-15T09:04:00+00:00/1.log
*** Failed to fetch log file from worker. Invalid URL 'http://:8793/log/tiny_demo80677608236/task_0/2021-01-15T09:04:00+00:00/1.log': No host supplied

What you expected to happen:

Task should be success.

How to reproduce it:

I don’t know how to reproduce it steadyly. It happened sometimes.

Anything else we need to know:

No