fix: add id normalization and address change logging

- Normalize id parameter at function boundary (trim whitespace)
- Log when DataNode IP:Port changes (helps debug K8s pod rescheduling)

Ref: https://github.com/seaweedfs/seaweedfs/issues/7487

weed/topology/rack.go

@@ -50,13 +50,20 @@ func (r *Rack) GetOrCreateDataNode(ip string, port int, grpcPort int, publicUrl
 	r.Lock()
 	defer r.Unlock()
 
+	// Normalize the id parameter (trim whitespace)
+	id = strings.TrimSpace(id)
+
 	// Determine the node ID: use provided id, or fall back to ip:port for backward compatibility
 	nodeId := util.GetVolumeServerId(id, ip, port)
 
 	// First, try to find by node ID using O(1) map lookup (stable identity)
 	if c, ok := r.children[NodeId(nodeId)]; ok {
 		dn := c.(*DataNode)
-		// Update the IP/Port in case they changed (e.g., pod rescheduled in K8s)
+		// Log if IP or Port changed (e.g., pod rescheduled in K8s)
+		if dn.Ip != ip || dn.Port != port {
+			glog.V(0).Infof("DataNode %s address changed from %s:%d to %s:%d", nodeId, dn.Ip, dn.Port, ip, port)
+		}
+		// Update the IP/Port in case they changed
 		dn.Ip = ip
 		dn.Port = port
 		dn.GrpcPort = grpcPort