cannot specify task of UserClass when locust run on distributed mode

[skyterra]

Prerequisites

• [X] I am using the latest version of Locust
• [X] I am reporting a bug, not asking a question

Description

if launch locust with --processes argument, choosing task will not working.

Command line

locust --processes 2 --class-picker -f locustfiles

Locustfile contents

...

Python version

3.12

Locust version

2.24

Operating system

macOS or centOS

[cyberw]

huh. good find. unfortunately it will probably be hard to support, so I'll probably "fix" it by throwing an error (at least for now)

[skyterra]

I guess the reason it's hard to support is that in distributed mode, there's no shared data strategy. The single-process mode uses memory, while distributed mode would require introducing Redis or other memory database.

[cyberw]

Actually. When I think about it, it should work. Not sure when I'll have time to look at it though...

[andrewbaldwin44]

It would be the same for distributed mode, we need to communicate between the workers and the master node so that the workers know that the list of tasks has changed. @cyberw Perhaps in the meantime we should throw an error or note something in the documentation that these arguments don't work together yet

[cyberw]

We shouldnt really have options that only work with non-distributed so we need to try and solve it (or remove task selection entirely). But erroring out when combined with --processes or --master is better than the current state I guess :)