random pick node in growth volume

return random host in redirect
change verison to 0.73 beta

go/topology/volume_growth.go

@@ -182,7 +182,7 @@ func makeExceptNodeFilter(nodes []Node) FilterNodeFn {
 // 2. find rest data nodes
 func FindEmptySlotsForOneVolume(topo *Topology, option *VolumeGrowOption, existsServers *VolumeLocationList) (additionServers []*DataNode, err error) {
 	//find main datacenter and other data centers
-	pickNodesFn := PickLowUsageNodeFn
+	pickNodesFn := RandomlyPickNodeFn
 	rp := option.ReplicaPlacement
 
 	pickMainAndRestNodes := func(np NodePicker, totalNodeCount int, filterFirstNodeFn FilterNodeFn, existsNodes []Node) (mainNode Node, restNodes []Node, e error) {

go/util/constants.go

@@ -1,5 +1,5 @@
 package util
 
 const (
-	VERSION = "0.72 beta"
+	VERSION = "0.73 beta"
 )

go/weed/weed_server/volume_server_handlers_read.go

@@ -48,7 +48,7 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		lookupResult, err := operation.Lookup(vs.GetMasterNode(), volumeId.String(), r.FormValue("collection"))
 		glog.V(2).Infoln("volume", volumeId, "found on", lookupResult, "error", err)
 		if err == nil && len(lookupResult.Locations) > 0 {
-			u, _ := url.Parse(util.NormalizeUrl(lookupResult.Locations.Head().PublicUrl))
+			u, _ := url.Parse(util.NormalizeUrl(lookupResult.Locations.PickForRead().PublicUrl))
 			u.Path = r.URL.Path
 			http.Redirect(w, r, u.String(), http.StatusMovedPermanently)
 		} else {