K8s: Fallback issue if there are no running pods in service

Help Kubernetes
#1

I have two services in Kubernetes: service-a and service-b.
Dtab is configured next way:

/service => /service-a | /service-b

The issue is that if Kubernetes restarts pods in service-a and all pods become unavailable traffic doesn’t go to service-b anyway.

#2

Hi @ievgen-kolomiiets! Looks like this is a corner case we don’t currently handle. When service-a has no pods, we return an empty address set for it. We should probably return Neg instead so that we can fallback to service-b in this case.

Would you mind filing a Github issue? Thanks!

#3

Hi @Alex. Thanks for your response. I created an issue on Github - https://github.com/linkerd/linkerd/issues/1549.

Also want to mention that fallback should probably work in a case when all pods in service mark as dead by Linkerd not only if they are missing. But not sure if it is possible to do it at all.

#4

Thanks for the issue! I’ll make sure it gets onto the roadmap.