weed master add peers=none option for faster startup (#7419)

* weed master -peers=none

* single master mode only when peers is none

* refactoring

* revert duplicated code

* revert

* Update weed/command/master.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* preventing "none" passed to other components if master is not started

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

weed/command/master.go

@@ -38,6 +38,10 @@ var (
 	m MasterOptions
 )
 
+const (
+	raftJoinCheckDelay = 1500 * time.Millisecond // delay before checking if we should join a raft cluster
+)
+
 type MasterOptions struct {
 	port                       *int
 	portGrpc                   *int
@@ -74,7 +78,7 @@ func init() {
 	m.ip = cmdMaster.Flag.String("ip", util.DetectedHostAddress(), "master <ip>|<server> address, also used as identifier")
 	m.ipBind = cmdMaster.Flag.String("ip.bind", "", "ip address to bind to. If empty, default to same as -ip option.")
 	m.metaFolder = cmdMaster.Flag.String("mdir", os.TempDir(), "data directory to store meta data")
-	m.peers = cmdMaster.Flag.String("peers", "", "all master nodes in comma separated ip:port list, example: 127.0.0.1:9093,127.0.0.1:9094,127.0.0.1:9095")
+	m.peers = cmdMaster.Flag.String("peers", "", "all master nodes in comma separated ip:port list, example: 127.0.0.1:9093,127.0.0.1:9094,127.0.0.1:9095; use 'none' for single-master mode")
 	m.volumeSizeLimitMB = cmdMaster.Flag.Uint("volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
 	m.volumePreallocate = cmdMaster.Flag.Bool("volumePreallocate", false, "Preallocate disk space for volumes.")
 	m.maxParallelVacuumPerServer = cmdMaster.Flag.Int("maxParallelVacuumPerServer", 1, "maximum number of volumes to vacuum in parallel per volume server")
@@ -105,6 +109,9 @@ var cmdMaster = &Command{
 
 	The example security.toml configuration file can be generated by "weed scaffold -config=security"
 
+	For single-master setups, use -peers=none to skip Raft quorum wait and enable instant startup.
+	This is ideal for development or standalone deployments.
+
   `,
 }
 
@@ -181,6 +188,9 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 
 	// start raftServer
 	metaDir := path.Join(*masterOption.metaFolder, fmt.Sprintf("m%d", *masterOption.port))
+
+	isSingleMaster := isSingleMasterMode(*masterOption.peers)
+
 	raftServerOption := &weed_server.RaftServerOption{
 		GrpcDialOption:    security.LoadClientTLS(util.GetViper(), "grpc.master"),
 		Peers:             masterPeers,
@@ -203,6 +213,11 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 		if raftServer == nil {
 			glog.Fatalf("please verify %s is writable, see https://github.com/seaweedfs/seaweedfs/issues/717: %s", *masterOption.metaFolder, err)
 		}
+		// For single-master mode, initialize cluster immediately without waiting
+		if isSingleMaster {
+			glog.V(0).Infof("Single-master mode: initializing cluster immediately")
+			raftServer.DoJoinCommand()
+		}
 	}
 	ms.SetRaftServer(raftServer)
 	r.HandleFunc("/cluster/status", raftServer.StatusHandler).Methods(http.MethodGet, http.MethodHead)
@@ -230,10 +245,10 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	}
 	go grpcS.Serve(grpcL)
 
-	timeSleep := 1500 * time.Millisecond
+	// For multi-master mode with non-Hashicorp raft, wait and check if we should join
-	if !*masterOption.raftHashicorp {
+	if !*masterOption.raftHashicorp && !isSingleMaster {
 		go func() {
-			time.Sleep(timeSleep)
+			time.Sleep(raftJoinCheckDelay)
 
 			ms.Topo.RaftServerAccessLock.RLock()
 			isEmptyMaster := ms.Topo.RaftServer.Leader() == "" && ms.Topo.RaftServer.IsLogEmpty()
@@ -292,9 +307,24 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	select {}
 }
 
+func isSingleMasterMode(peers string) bool {
+	p := strings.ToLower(strings.TrimSpace(peers))
+	return p == "none"
+}
+
 func checkPeers(masterIp string, masterPort int, masterGrpcPort int, peers string) (masterAddress pb.ServerAddress, cleanedPeers []pb.ServerAddress) {
 	glog.V(0).Infof("current: %s:%d peers:%s", masterIp, masterPort, peers)
 	masterAddress = pb.NewServerAddress(masterIp, masterPort, masterGrpcPort)
+
+	// Handle special case: -peers=none for single-master setup
+	if isSingleMasterMode(peers) {
+		glog.V(0).Infof("Running in single-master mode (peers=none), no quorum required")
+		cleanedPeers = []pb.ServerAddress{masterAddress}
+		return
+	}
+
+	peers = strings.TrimSpace(peers)
+
 	cleanedPeers = pb.ServerAddresses(peers).ToAddresses()
 
 	hasSelf := false

weed/command/server.go

@@ -232,10 +232,17 @@ func runServer(cmd *Command, args []string) bool {
 		*isStartingFiler = true
 	}
 
+	var actualPeersForComponents string
 	if *isStartingMasterServer {
+		// If we are starting a master, validate and complete the peer list
 		_, peerList := checkPeers(*serverIp, *masterOptions.port, *masterOptions.portGrpc, *masterOptions.peers)
-		peers := strings.Join(pb.ToAddressStrings(peerList), ",")
+		actualPeersForComponents = strings.Join(pb.ToAddressStrings(peerList), ",")
-		masterOptions.peers = &peers
+	} else if *masterOptions.peers != "" {
+		if isSingleMasterMode(*masterOptions.peers) {
+			glog.Fatalf("'-master.peers=none' is only valid when starting a master server, but master is not starting.")
+		}
+		// If not starting a master, just use the provided peers
+		actualPeersForComponents = *masterOptions.peers
 	}
 
 	if *serverBindIp == "" {
@@ -249,7 +256,8 @@ func runServer(cmd *Command, args []string) bool {
 	// ip address
 	masterOptions.ip = serverIp
 	masterOptions.ipBind = serverBindIp
-	filerOptions.masters = pb.ServerAddresses(*masterOptions.peers).ToServiceDiscovery()
+	// Use actualPeersForComponents for volume/filer, not masterOptions.peers which might be "none"
+	filerOptions.masters = pb.ServerAddresses(actualPeersForComponents).ToServiceDiscovery()
 	filerOptions.ip = serverIp
 	filerOptions.bindIp = serverBindIp
 	if *s3Options.bindIp == "" {
@@ -259,11 +267,11 @@ func runServer(cmd *Command, args []string) bool {
 		sftpOptions.bindIp = serverBindIp
 	}
 	iamOptions.ip = serverBindIp
-	iamOptions.masters = masterOptions.peers
+	iamOptions.masters = &actualPeersForComponents
 	webdavOptions.ipBind = serverBindIp
 	serverOptions.v.ip = serverIp
 	serverOptions.v.bindIp = serverBindIp
-	serverOptions.v.masters = pb.ServerAddresses(*masterOptions.peers).ToAddresses()
+	serverOptions.v.masters = pb.ServerAddresses(actualPeersForComponents).ToAddresses()
 	serverOptions.v.idleConnectionTimeout = serverTimeout
 	serverOptions.v.dataCenter = serverDataCenter
 	serverOptions.v.rack = serverRack