[sig-scheduling] Code Freeze Exception Request: Fast host-scoped interpod affinity
Tetiana Khotiaintseva
Hello Release Team,
I'd like to request a 7 calendar day code freeze exception for the following enhancement.
Enhancement name: Fast Host-Scoped Inter-Pod Affinity and Anti-Affinity
Enhancement status: Alpha
SIG: SIG Scheduling
k/enhancements issue (KEP): None. SIG Scheduling maintainers agreed a KEP would be an overkill since the changes are conceptually straightforward and well isolated behind a feature gate.
Tracking issue: https://github.com/kubernetes/kubernetes/issues/138314PR: https://github.com/kubernetes/kubernetes/pull/138198
Additional time needed: 7 calendar days (due Wednesday, July 29)
Reason this enhancement is critical: It brings a massive performance optimization to the interpodaffinity plugin. It avoids expensive O(N*M) cluster-wide scans for the common kubernetes.io/hostname topology by introducing a fast-track evaluation path. Scheduling throughput is 161.24% faster (p90) in the heaviest performance test. This performance improvement is critical for Cluster Autoscaler, which simply doesn't work on large clusters if interpod (anti)affinity is used.
Reason the extension is needed: The implementation is fully complete and in the final active review stage. We need a little more time to gather the final LGTM and Approvals from the maintainers.
Risks from adding code late: Very low. The changes are strictly guarded by the InterPodAffinityHostnameFastPath feature gate, which is an Alpha feature disabled by default.
Risks from cutting the enhancement: Delaying a fully implemented and heavily reviewed performance improvement that would greatly benefit the community.
Thank you,
Tetiana Khotiaintseva
SWE @ GKE Cluster Autoscaler
Google Poland
Dominik Marcinski
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