Feature: Labels for specific indices to use as a selector?

[v]

Hi Batch WG!

I've recently been exposing services, everything from a little API running inside one of the indices of my job, to an actual Kubernetes cluster API, and in both these cases I've had to manually label the index 0 pod of my indexed job. The docs say that we should see batch.kubernetes.io/X labels, but I see "app.kubernetes.io/name=flux-sample." I noticed that we do have an annotation that corresponds to the index with this format:

Annotations:      batch.kubernetes.io/job-completion-index: 0

But for labels I only see my custom labels, along with the app one mentioned above that has the job name:

Labels:      app.kubernetes.io/name=flux-sample
                  namespace=flux-operator

I think I'd like to see an equivalent label for the job completion index for use as a selector, unless there is some way to take advantage of the annotation that I'm not aware of.

Has anyone else wanted or needed this use case?

Happy Friday!

Best,

Vanessa

[Daniel Vega-Myhre]

Hi Vanessa,

There is a KEP under review right now which proposes adding the job completion index as a label on indexed job pods (as well as adding the pod index as a label for StatefulSet pods): https://github.com/kubernetes/enhancements/pull/4019

Feel free to add any thoughts/feedback you have on it.

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[Aldo Culquicondor]

In other words, today there's no other alternative than adding the index manually.

Aldo

[v]

Cool - then that is what I will keep doing (and I also added a comment to the KEP). Thank you to you both!