add disable volume_growth flag (#7196)

weed/command/scaffold/master.toml

@@ -50,6 +50,7 @@ copy_2 = 6                # create 2 x 6 = 12 actual volumes
 copy_3 = 3                # create 3 x 3 = 9 actual volumes
 copy_other = 1            # create n x 1 = n actual volumes
 threshold = 0.9           # create threshold
+disable = false           # disables volume growth if true
 
 # configuration flags for replication
 [master.replication]

weed/server/master_grpc_server_assign.go

@@ -89,7 +89,7 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 
 	for time.Now().Sub(startTime) < maxTimeout {
 		fid, count, dnList, shouldGrow, err := ms.Topo.PickForWrite(req.Count, option, vl)
-		if shouldGrow && !vl.HasGrowRequest() {
+		if shouldGrow && !vl.HasGrowRequest() && !ms.option.VolumeGrowthDisabled {
 			if err != nil && ms.Topo.AvailableSpaceFor(option) <= 0 {
 				err = fmt.Errorf("%s and no free volumes left for %s", err.Error(), option.String())
 			}

weed/server/master_grpc_server_volume.go

@@ -28,6 +28,10 @@ const (
 )
 
 func (ms *MasterServer) DoAutomaticVolumeGrow(req *topology.VolumeGrowRequest) {
+	if ms.option.VolumeGrowthDisabled {
+	    glog.V(1).Infof("automatic volume grow disabled")
+		return
+	}
 	glog.V(1).Infoln("starting automatic volume grow")
 	start := time.Now()
 	newVidLocations, err := ms.vg.AutomaticGrowByType(req.Option, ms.grpcDialOption, ms.Topo, req.Count)

weed/server/master_server.go

@@ -57,6 +57,7 @@ type MasterOption struct {
 	IsFollower              bool
 	TelemetryUrl            string
 	TelemetryEnabled        bool
+	VolumeGrowthDisabled      bool
 }
 
 type MasterServer struct {
@@ -105,6 +106,9 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers map[string]pb.Se
 	v.SetDefault("master.volume_growth.copy_3", topology.VolumeGrowStrategy.Copy3Count)
 	v.SetDefault("master.volume_growth.copy_other", topology.VolumeGrowStrategy.CopyOtherCount)
 	v.SetDefault("master.volume_growth.threshold", topology.VolumeGrowStrategy.Threshold)
+	v.SetDefault("master.volume_growth.disable", false)
+	option.VolumeGrowthDisabled = v.GetBool("master.volume_growth.disable")
+
 	topology.VolumeGrowStrategy.Copy1Count = v.GetUint32("master.volume_growth.copy_1")
 	topology.VolumeGrowStrategy.Copy2Count = v.GetUint32("master.volume_growth.copy_2")
 	topology.VolumeGrowStrategy.Copy3Count = v.GetUint32("master.volume_growth.copy_3")

weed/server/master_server_handlers.go

@@ -142,7 +142,7 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 
 	for time.Since(startTime) < maxTimeout {
 		fid, count, dnList, shouldGrow, err := ms.Topo.PickForWrite(requestedCount, option, vl)
-		if shouldGrow && !vl.HasGrowRequest() {
+		if shouldGrow && !vl.HasGrowRequest() && !ms.option.VolumeGrowthDisabled {
 			glog.V(0).Infof("dirAssign volume growth %v from %v", option.String(), r.RemoteAddr)
 			if err != nil && ms.Topo.AvailableSpaceFor(option) <= 0 {
 				err = fmt.Errorf("%s and no free volumes left for %s", err.Error(), option.String())