Questions about upgrading cluster-autoscaler from 1.23 to 1.28

[duyawen8]

Which component are you using?: cluster-autoscaler

Is your feature request designed to solve a problem? If so describe the problem this feature should solve.:

Describe the solution you'd like.:

Describe any alternative solutions you've considered.:

Additional context.:

I want to upgrade CA from 1.23 to 1.28 to use the parallel drain feature. The kubernetes version is 1.21. Is there any compatibility issue?

[Shubham82]

Hi @duyawen8, there will be a compatibility issue, if you use k8s v1.21 for CA 1.28. For CA 1.28, you have to use k8s v1.28.
See the release section under README.md for the corresponding k8s version to the CA version.

[Shubham82]

/remove-kind feature
/kind support

[adrianmoisey]

/area cluster-autoscaler

[Shubham82]

@duyawen8, if your concern is resolved so can we close this issue?

[duyawen8]

I know that the CA version and the kubernetes version have a one-to-one correspondence. Is there any way to use CA 1.28 for parallel eviction without upgrading the cluster? Are there definitely compatibility issues?

[Shubham82]

IMO there will be compatibility issues because For every CA release, we update corresponding upstream dependencies(k8s).
so there might be issues with mismatched and deprecated API items, I don't think it's recommended to use a CA that is greater than your cluster version.

[Shubham82]

cc @gjtempleton @MaciekPytel
your thoughts on this?