The multi-instance workflows executing occur "previous workflow execution scheduled different type of activity"

[Robinmxc]

Our application integrates workflow and is deployed with multiple instances. However, this error occurred recently.

I have read some of the source code and found that the generation of scheduleEventID may be the cause of this problem.

func (wf *WfState) GetNextScheduleEventID() int64 {
scheduleEventID := wf.scheduleEventID
wf.scheduleEventID++
return scheduleEventID
}

Because we are deploying multiple instances, it may not result in all scheduleEventIDs being generated within the same instance. Therefore, I would like to ask if workflow does not support multiple instances.

[cschleiden]

Only a single executor should work on a task and an instance at a time, so there shouldn't be any conflicts. All of the events having the same #420 sequence ID looks suspicious to me. What backend are you using?

[Robinmxc]

MySQL Server version: 8.0.32-0ubuntu0.20.04.2 (Ubuntu)
I guess this may not be a problem with the sequence ID. The sequence ID you see is the same, but it should be a problem with the front-end display. There is still a number after 420, so you may need to optimize the front-end display.

Here is another example, where there is a slight issue with the UI display.

[cschleiden]

Are you able to create a minimal repro or share relevant parts of your code?