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🐛 Fix MachinePool nodeRef UID mismatch after K8s upgrade #12392

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🐛 Fix MachinePool nodeRef UID mismatch after K8s upgrade #12392

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1dca9bc
Fix MachinePool nodeRef UID mismatch after K8s upgrade
jayesh-srivastava Jun 23, 2025
089da7d
Add len when creating nodeNameMap
jayesh-srivastava Jul 30, 2025
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29 changes: 27 additions & 2 deletions exp/internal/controllers/machinepool_controller_noderef.go
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Original file line number Diff line number Diff line change
Expand Up @@ -70,8 +70,33 @@ func (r *MachinePoolReconciler) reconcileNodeRefs(ctx context.Context, s *scope)
readyReplicas = mp.Status.Deprecated.V1Beta1.ReadyReplicas
}
if ptr.Deref(mp.Status.Replicas, 0) == readyReplicas && len(mp.Status.NodeRefs) == int(readyReplicas) {
v1beta1conditions.MarkTrue(mp, clusterv1.ReplicasReadyV1Beta1Condition)
return ctrl.Result{}, nil
// Validate that the UIDs in NodeRefs are still valid
if s.nodeRefMap != nil {
// Create a name-to-node mapping for efficient lookup
nodeNameMap := make(map[string]*corev1.Node, len(s.nodeRefMap))
for _, node := range s.nodeRefMap {
nodeNameMap[node.Name] = node
}

validNodeRefs := true
for _, nodeRef := range mp.Status.NodeRefs {
foundNode, exists := nodeNameMap[nodeRef.Name]

// If node not found or UID doesn't match, mark as invalid
if !exists || foundNode.UID != nodeRef.UID {
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It might be good to have a higher verbosity log entry if the node names are the same but the UIDs are different.

validNodeRefs = false
break
}
}

if validNodeRefs {
v1beta1conditions.MarkTrue(mp, clusterv1.ReplicasReadyV1Beta1Condition)
return ctrl.Result{}, nil
}
} else {
// If nodeRefMap is nil, we can't validate UIDs, so proceed with reconciliation
log.V(2).Info("NodeRefMap is nil, proceeding with reconciliation to validate NodeRefs")
}
}

// Check that the MachinePool has valid ProviderIDList.
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