Unable to import Airflow plugins

Apache Airflow version: 1.10.14rc1

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

Environment:

• Cloud provider or hardware configuration: docker (linux)
• OS (e.g. from /etc/os-release): Debian GNU/Linux 10 (buster) (official docker image)
• Kernel (e.g. uname -a): Linux 5.4.39
• Install tools: official docker image with docker-compose
• Others:

What happened:

Unable to import Airflow plugins.

Here is a bit more context:

[2020-12-06 15:33:25,513] {plugins_manager.py:159} ERROR - Failed to import plugin AirflowPrometheus
worker_1     | Traceback (most recent call last):
worker_1     |   File "/home/airflow/.local/lib/python3.8/site-packages/airflow/plugins_manager.py", line 150, in load_entrypoint_plugins
worker_1     |     plugin_obj.__usable_import_name = entry_point.module
worker_1     | AttributeError: 'EntryPoint' object has no attribute 'module'
worker_1     | Traceback (most recent call last):
worker_1     |   File "/home/airflow/.local/lib/python3.8/site-packages/airflow/plugins_manager.py", line 150, in load_entrypoint_plugins
worker_1     |     plugin_obj.__usable_import_name = entry_point.module
worker_1     | AttributeError: 'EntryPoint' object has no attribute 'module'

What you expected to happen: Airflow plugins should be loaded without any problem.

How to reproduce it: From official latest docker image:

FROM apache/airflow:1.10.13-python3.8
RUN pip install --no-cache-dir --user -U apache-airflow==1.10.14rc1 airflow-exporter==1.3.0

Anything else we need to know:

I guess it’s related to recent changes in apache/airflow#12694. I have little knowledge on importlib, but it seems like there’s no module nor module_name in importlib.metadata.EntryPoint.

[kaxil]

closed by https://github.com/apache/airflow/pull/12859

[mjpieters]

i.e. remove ; python_version<"3.8" bit

Not remove; update 3.8 to 3.9.