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feat(supervisor): project-based scheduling affinity for image cache locality #2995

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Merged
myftija merged 2 commits into from
Feb 4, 2026
Merged

feat(supervisor): project-based scheduling affinity for image cache locality #2995

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306cbc8
feat(supervisor): project-based scheduling affinity for image cache l…
myftija Feb 4, 2026
9c5be34
Add empty string guard for KUBERNETES_PROJECT_AFFINITY_TOPOLOGY_KEY
myftija Feb 4, 2026
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5 changes: 5 additions & 0 deletions apps/supervisor/src/env.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,11 @@ const Env = z.object({
KUBERNETES_SCHEDULER_NAME: z.string().optional(), // Custom scheduler name for pods
KUBERNETES_LARGE_MACHINE_POOL_LABEL: z.string().optional(), // if set, large-* presets affinity for machinepool=<value>

// Project affinity settings - pods from the same project prefer the same node
KUBERNETES_PROJECT_AFFINITY_ENABLED: BoolEnv.default(false),
KUBERNETES_PROJECT_AFFINITY_WEIGHT: z.coerce.number().int().min(1).max(100).default(50),
KUBERNETES_PROJECT_AFFINITY_TOPOLOGY_KEY: z.string().default("kubernetes.io/hostname"),

// Placement tags settings
PLACEMENT_TAGS_ENABLED: BoolEnv.default(false),
PLACEMENT_TAGS_PREFIX: z.string().default("node.cluster.x-k8s.io"),
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88 changes: 62 additions & 26 deletions apps/supervisor/src/workloadManager/kubernetes.ts
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Expand Up @@ -120,7 +120,7 @@ export class KubernetesWorkloadManager implements WorkloadManager {
},
spec: {
...this.addPlacementTags(this.#defaultPodSpec, opts.placementTags),
affinity: this.#getNodeAffinity(opts.machine),
affinity: this.#getAffinity(opts.machine, opts.projectId),
terminationGracePeriodSeconds: 60 * 60,
containers: [
{
Expand Down Expand Up @@ -390,50 +390,86 @@ export class KubernetesWorkloadManager implements WorkloadManager {
return preset.name.startsWith("large-");
}

#getNodeAffinity(preset: MachinePreset): k8s.V1Affinity | undefined {
#getAffinity(preset: MachinePreset, projectId: string): k8s.V1Affinity | undefined {
const nodeAffinity = this.#getNodeAffinityRules(preset);
const podAffinity = this.#getProjectPodAffinity(projectId);

if (!nodeAffinity && !podAffinity) {
return undefined;
}

return {
...(nodeAffinity && { nodeAffinity }),
...(podAffinity && { podAffinity }),
};
}

#getNodeAffinityRules(preset: MachinePreset): k8s.V1NodeAffinity | undefined {
if (!env.KUBERNETES_LARGE_MACHINE_POOL_LABEL) {
return undefined;
}

if (this.#isLargeMachine(preset)) {
// soft preference for the large-machine pool, falls back to standard if unavailable
return {
nodeAffinity: {
preferredDuringSchedulingIgnoredDuringExecution: [
{
weight: 100,
preference: {
matchExpressions: [
{
key: "node.cluster.x-k8s.io/machinepool",
operator: "In",
values: [env.KUBERNETES_LARGE_MACHINE_POOL_LABEL],
},
],
},
preferredDuringSchedulingIgnoredDuringExecution: [
{
weight: 100,
preference: {
matchExpressions: [
{
key: "node.cluster.x-k8s.io/machinepool",
operator: "In",
values: [env.KUBERNETES_LARGE_MACHINE_POOL_LABEL],
},
],
},
],
},
},
],
};
}

// not schedulable in the large-machine pool
return {
nodeAffinity: {
requiredDuringSchedulingIgnoredDuringExecution: {
nodeSelectorTerms: [
{
requiredDuringSchedulingIgnoredDuringExecution: {
nodeSelectorTerms: [
{
matchExpressions: [
{
key: "node.cluster.x-k8s.io/machinepool",
operator: "NotIn",
values: [env.KUBERNETES_LARGE_MACHINE_POOL_LABEL],
},
],
},
],
},
};
}

#getProjectPodAffinity(projectId: string): k8s.V1PodAffinity | undefined {
if (!env.KUBERNETES_PROJECT_AFFINITY_ENABLED) {
return undefined;
}

return {
preferredDuringSchedulingIgnoredDuringExecution: [
{
weight: env.KUBERNETES_PROJECT_AFFINITY_WEIGHT,
podAffinityTerm: {
labelSelector: {
matchExpressions: [
{
key: "node.cluster.x-k8s.io/machinepool",
operator: "NotIn",
values: [env.KUBERNETES_LARGE_MACHINE_POOL_LABEL],
key: "project",
operator: "In",
values: [projectId],
},
],
},
],
topologyKey: env.KUBERNETES_PROJECT_AFFINITY_TOPOLOGY_KEY,
},
},
},
],
};
}
}