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adrienjt avatar adrienjt commented on July 19, 2024

The problem here is that the preferred affinity is used as a constraint by the candidate schedulers in the target clusters. Since it's preferred, not required, both clusters tolerate the constraint, and the (unconstrained) proxy scheduler in the source cluster spreads by default.

You need to use the preferred affinity as a proxy scheduler constraint, using either the multicluster.admiralty.io/use-constraints-from-spec-for-proxy-pod-scheduling: "" pod annotation (if you don't need candidate scheduler constraints) or the multicluster.admiralty.io/proxy-pod-scheduling-constraints: <PodSpec yaml> pod annotation (if you need constraints at both levels).

In practice though, if one cluster is elastic and the other one isn't, no need for a preferred affinity. Admiralty will send two candidate pods until one is scheduled, cancelling any scale-up in the elastic cluster if there's capacity in the inelastic cluster.

from admiralty.

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