remove shallow clone

weed/wdclient/masterclient.go

@@ -580,8 +580,9 @@ func (mc *MasterClient) resetVidMap() {
 	mc.vidMapLock.Lock()
 	defer mc.vidMapLock.Unlock()
 
-	// Create a shallow clone to preserve in the cache chain
-	tail := mc.vidMap.shallowClone()
+	// Preserve the existing vidMap in the cache chain
+	// No need to clone - the existing vidMap has its own mutex for thread safety
+	tail := mc.vidMap
 
 	nvm := newVidMap(tail.DataCenter)
 	nvm.cache.Store(tail)

weed/wdclient/vid_map.go

@@ -54,21 +54,6 @@ func newVidMap(dataCenter string) *vidMap {
 	}
 }
 
-// shallowClone creates a shallow copy of the vidMap for use in cache chaining.
-// The caller is responsible for ensuring thread safety.
-func (vc *vidMap) shallowClone() *vidMap {
-	newMap := &vidMap{
-		vid2Locations:   vc.vid2Locations,
-		ecVid2Locations: vc.ecVid2Locations,
-		DataCenter:      vc.DataCenter,
-	}
-	// Atomically copy the cache pointer
-	if cachedMap := vc.cache.Load(); cachedMap != nil {
-		newMap.cache.Store(cachedMap)
-	}
-	return newMap
-}
-
 func (vc *vidMap) getLocationIndex(length int) (int, error) {
 	if length <= 0 {
 		return 0, fmt.Errorf("invalid length: %d", length)