example openstack_metric task.yaml fails

[Walt Boring]

Running the documented example task fails.

The readme.rst here:
https://github.com/openstack/rally-openstack

Says to run

rally task start ./tasks/openstack_metrics/task.yaml --task-args {"image_name": "image_to_use", "flavor_name": "flavor_to_use"}

but it fails due to validation error.

rally task start ./tasks/openstack_metrics/task.yaml --task-args '{"image_name": "ubuntu-20.04-amd64-vmware", "flavor_name": "m1.medium", "floating_network": "my-floating"}'

RESULTS:

2020-11-05 12:12:05.371 9172 INFO rally.task.engine [-] Task e983a6a1-a944-4141-bc6b-034d6e24c13d | Starting: Task validation.
2020-11-05 12:12:05.376 9172 INFO rally.task.engine [-] Task e983a6a1-a944-4141-bc6b-034d6e24c13d | Starting: Task validation of syntax.
Input task is invalid!

Subtask GlanceImages.list_images[0] has wrong configuration
Subtask configuration:
{"version": 2, "title": "A cropped version of a bigger task.", "description": "Auto-generated task from a single workload", "subtasks": [{"title": "GlanceImages.list_images", "description": "List all images.", "scenario": {"GlanceImages.list_images": {"detailed": true}}, "contexts": {}, "runner": {"constant": {"times": 1, "concurrency": 1}}, "hooks": [], "sla": {"failure_rate": {"max": 0}}}]}

Reason(s):
 Scenario plugin 'GlanceImages.list_images' doesn't pass args-spec@default validation. Details: Unexpected argument(s) found ['detailed']. Use `rally plugin show --name GlanceImages.list_images --platform openstack` to display scenario description

[Andriy Kurilin (andreykurilin)]

Can you submit a change to remove this wrong argument?

[Walt Boring (walter-boring)]

I was able to fix it by replacing

      title: "Glance Image List"
      scenario:
        GlanceImages.list_images:
          detailed: True

with

      title: "Glance Image List"
      scenario:
        GlanceImages.list_images: {}

But now I am getting tons of multiprocessing errors:

2020-11-06 11:52:48.828 35147 ERROR rally.task.engine [-] Unexpected exception during the workload execution: TypeError: 'NoneType' object is not callable
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine Traceback (most recent call last):
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/devel/SAP/rally/.venv/lib/python3.8/site-packages/rally/task/engine.py", line 533, in _run_workload
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine runner_obj.run(workload["name"], context_obj,
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/devel/SAP/rally/.venv/lib/python3.8/site-packages/rally/task/runner.py", line 166, in run
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine self._run_scenario(scenario_plugin, "run", context, args)
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/devel/SAP/rally/.venv/lib/python3.8/site-packages/rally/plugins/task/runners/constant.py", line 244, in _run_scenario
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine process_pool = self._create_process_pool(
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/devel/SAP/rally/.venv/lib/python3.8/site-packages/rally/task/runner.py", line 192, in _create_process_pool
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine process.start()
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/.pyenv/versions/3.8.5/lib/python3.8/multiprocessing/process.py", line 121, in start
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine self._popen = self._Popen(self)
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/.pyenv/versions/3.8.5/lib/python3.8/multiprocessing/context.py", line 224, in _Popen
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine return _default_context.get_context().Process._Popen(process_obj)
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/.pyenv/versions/3.8.5/lib/python3.8/multiprocessing/context.py", line 284, in _Popen
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine return Popen(process_obj)
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/.pyenv/versions/3.8.5/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 32, in __init__
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine super().__init__(process_obj)
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/.pyenv/versions/3.8.5/lib/python3.8/multiprocessing/popen_fork.py", line 19, in __init__
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine self._launch(process_obj)
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine File "/Users/i530566/.pyenv/versions/3.8.5/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 47, in _launch
2020-11-06 11:52:48.828 35147 ERROR rally.task.engine reduction.dump(proce...