Non-preempting PriorityClass without schedule backof

Question

I'm working on an application that launches K8S Job (dockerised computer science batchs applications) and I want to prioritizes their launchs.

I don't want to use preemption because all jobs have to be done and I want to be sure that the scheduling order is maintained.

When I read this doc: https://kubernetes.io/docs/concepts/scheduling-eviction/pod-priority-preemption/#non-preempting-priority-class It seems that, in non preempting cases, high priority pods can be scheduled after low priority ones if K8S doesn't have the necessary resources at the time. In case of high priority Jobs are the most demanding, this kind of pods will never be scheduled.

How can I have a control of that decisions?

Thanks!

score 1 · Answer 1 · answered Jan 10 '23 at 11:50

1

As you need to use only Non preemptive refer to this SO and Doc which helps you in understanding the usage of this non preemptive class.

answered Jan 10 '23 at 11:50

Hemanth Kumar

Thanks for the links. But I don't find a way to keep the priority order with non preemptive class. – Saveriu CIANELLI Jan 11 '23 at 09:44
1

@SaveriuCIANELLI : I think you can use pod affinity and anti affinity for that refer to this document for more [detailed explanation](https://docs.openshift.com/container-platform/3.11/admin_guide/scheduling/pod_affinity.html). This concept is available in kubernetes as well but the explanation is more clear here than in kubernete docs – Hemanth Kumar Jan 12 '23 at 08:51
It mays be a way to do what I want, yes. I will test that, thank you. – Saveriu CIANELLI Jan 31 '23 at 09:13
if you find any solution, Post it as answer for greater community visible. – Hemanth Kumar Feb 01 '23 at 08:05
Of course, I will test it and I will share my results. – Saveriu CIANELLI Feb 01 '23 at 11:57

1 Answers1