Cancel a failed instance will sometimes make serviceTask run again

Camunda 8 Topics Discussion & Questions
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I have a process with some serviceTasks nodes. I use go client to provide job workers.

z.client.NewJobWorker().
			JobType("serviceTask").
			Handler(jobHandler).
			Open()

func jobHandler(client worker.JobClient, job entities.Job) {
    success := doSomeBusinessLogic()
    if success {
    // complete job
client.NewCompleteJobCommand().JobKey(job.Key).VariablesFromMap(toMerge).Send(context.Background())
    } else {
      // fail job
       logAndNotifyError()
       client.NewFailJobCommand().JobKey(job.GetKey()).Retries(job.Retries - 1).ErrorMessage(errorInfo).Send(ctx)
    }
}

When I tried to cancel a failed process instance via Operate by click “cancel” button, I noticed that sometimes this jobHandler will be called again and the complete or fail command will report an error like

Command ‘CANCEL’ rejected with code ‘NOT_FOUND’: Expected to cancel a process instance with key ‘2251799813765247’, but no such process was found

This behavior is confusing I cannot determine that wether jobHandler is called by a normal activated job or a cancel operation so that I can ignore business logic code running to avoid unexpected duplicated execution.
So is there a way to find out

  1. how can I avoid cancel command activate my jobHandler again?
  2. or if I can know this run is triggered by a cancel command?

Environment(I also met this problem before in 1.x):

  • Self-hosted zeebe 8.0.0
  • Self-hosted operate 8.0.0

thanks for your suggestions.

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