How do we support Job.Spec update

[hzxuzhonghu]

I noticed we want to support Job.Spec update in Controller.updateJob

But the generated request is

	req := apis.Request{
		Namespace: newJob.Namespace,
		JobName:   newJob.Name,

		Event: vkbatchv1.OutOfSyncEvent,
	}

But in syncJob
if no pods provided in request, it will create new pods for the Job, and so it will fail, and the following status is unknown.

btw, I am not very familiar with the entire state machine , and maybe i miss something.

[TommyLike]

All the pods are all identified via podName which depends on the jobName&taskName, the syncJob can find out which one to create and which one to delete. It should work but bugs may exist.

[hzxuzhonghu]

What i really mean is we should prevent handling update until we find a way to deal with it.
I am quite sure, the current logic do not support update Job.Spec, if we do, the syncJob will be executed continually again and again.