From da4edf3651d0dd17570057388e5e012eeda4ff80 Mon Sep 17 00:00:00 2001 From: Chris Lu Date: Wed, 7 Oct 2020 01:25:39 -0700 Subject: [PATCH] master: check peers for existing leader before starting a leader election fix https://github.com/chrislusf/seaweedfs/issues/1509 --- weed/command/master.go | 26 ++- weed/pb/master.proto | 1 + weed/pb/master_pb/master.pb.go | 227 ++++++++++++----------- weed/server/master_grpc_server.go | 17 ++ weed/server/master_grpc_server_volume.go | 13 -- weed/server/master_server.go | 5 +- weed/server/raft_server.go | 85 +++------ weed/wdclient/masterclient.go | 30 ++- 8 files changed, 214 insertions(+), 190 deletions(-) diff --git a/weed/command/master.go b/weed/command/master.go index a42983259..bf5f83875 100644 --- a/weed/command/master.go +++ b/weed/command/master.go @@ -1,15 +1,16 @@ package command import ( + "github.com/chrislusf/raft/protobuf" + "github.com/gorilla/mux" + "google.golang.org/grpc/reflection" "net/http" "os" "runtime" + "sort" "strconv" "strings" - - "github.com/chrislusf/raft/protobuf" - "github.com/gorilla/mux" - "google.golang.org/grpc/reflection" + "time" "github.com/chrislusf/seaweedfs/weed/util/grace" @@ -141,6 +142,15 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) { glog.V(0).Infof("Start Seaweed Master %s grpc server at %s:%d", util.Version(), *masterOption.ipBind, grpcPort) go grpcS.Serve(grpcL) + go func() { + time.Sleep(1500 * time.Millisecond) + if ms.Topo.RaftServer.Leader() == "" && ms.Topo.RaftServer.IsLogEmpty() && isTheFirstOne(myMasterAddress, peers) { + if ms.MasterClient.FindLeader(myMasterAddress) == "" { + raftServer.DoJoinCommand() + } + } + }() + go ms.MasterClient.KeepConnectedToMaster() // start http server @@ -174,6 +184,14 @@ func checkPeers(masterIp string, masterPort int, peers string) (masterAddress st return } +func isTheFirstOne(self string, peers []string) bool { + sort.Strings(peers) + if len(peers) <= 0 { + return true + } + return self == peers[0] +} + func (m *MasterOptions) toMasterOption(whiteList []string) *weed_server.MasterOption { return &weed_server.MasterOption{ Host: *m.ip, diff --git a/weed/pb/master.proto b/weed/pb/master.proto index 7ffc4ec76..96c3c75cc 100644 --- a/weed/pb/master.proto +++ b/weed/pb/master.proto @@ -275,6 +275,7 @@ message GetMasterConfigurationResponse { uint32 metrics_interval_seconds = 2; repeated StorageBackend storage_backends = 3; string default_replication = 4; + string leader = 5; } message ListMasterClientsRequest { diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go index 37f22ec09..d23366ade 100644 --- a/weed/pb/master_pb/master.pb.go +++ b/weed/pb/master_pb/master.pb.go @@ -2280,6 +2280,7 @@ type GetMasterConfigurationResponse struct { MetricsIntervalSeconds uint32 `protobuf:"varint,2,opt,name=metrics_interval_seconds,json=metricsIntervalSeconds,proto3" json:"metrics_interval_seconds,omitempty"` StorageBackends []*StorageBackend `protobuf:"bytes,3,rep,name=storage_backends,json=storageBackends,proto3" json:"storage_backends,omitempty"` DefaultReplication string `protobuf:"bytes,4,opt,name=default_replication,json=defaultReplication,proto3" json:"default_replication,omitempty"` + Leader string `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"` } func (x *GetMasterConfigurationResponse) Reset() { @@ -2342,6 +2343,13 @@ func (x *GetMasterConfigurationResponse) GetDefaultReplication() string { return "" } +func (x *GetMasterConfigurationResponse) GetLeader() string { + if x != nil { + return x.Leader + } + return "" +} + type ListMasterClientsRequest struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -3205,7 +3213,7 @@ var file_master_proto_rawDesc = []byte{ 0x70, 0x62, 0x2e, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x09, 0x6c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x22, 0x1f, 0x0a, 0x1d, 0x47, 0x65, 0x74, 0x4d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x43, 0x6f, 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0x77, 0x65, 0x65, 0x64, 0x66, + 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62, 0x2f, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, + 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33, } var ( diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go index 692909a29..e8fa3995d 100644 --- a/weed/server/master_grpc_server.go +++ b/weed/server/master_grpc_server.go @@ -3,6 +3,7 @@ package weed_server import ( "context" "fmt" + "github.com/chrislusf/seaweedfs/weed/storage/backend" "net" "strings" "time" @@ -302,3 +303,19 @@ func (ms *MasterServer) ListMasterClients(ctx context.Context, req *master_pb.Li } return resp, nil } + +func (ms *MasterServer) GetMasterConfiguration(ctx context.Context, req *master_pb.GetMasterConfigurationRequest) (*master_pb.GetMasterConfigurationResponse, error) { + + // tell the volume servers about the leader + leader, _ := ms.Topo.Leader() + + resp := &master_pb.GetMasterConfigurationResponse{ + MetricsAddress: ms.option.MetricsAddress, + MetricsIntervalSeconds: uint32(ms.option.MetricsIntervalSec), + StorageBackends: backend.ToPbStorageBackends(), + DefaultReplication: ms.option.DefaultReplicaPlacement, + Leader: leader, + } + + return resp, nil +} diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go index 6a320dfb1..7e12b8cd8 100644 --- a/weed/server/master_grpc_server_volume.go +++ b/weed/server/master_grpc_server_volume.go @@ -3,8 +3,6 @@ package weed_server import ( "context" "fmt" - "github.com/chrislusf/seaweedfs/weed/storage/backend" - "github.com/chrislusf/raft" "github.com/chrislusf/seaweedfs/weed/pb/master_pb" @@ -180,14 +178,3 @@ func (ms *MasterServer) LookupEcVolume(ctx context.Context, req *master_pb.Looku return resp, nil } -func (ms *MasterServer) GetMasterConfiguration(ctx context.Context, req *master_pb.GetMasterConfigurationRequest) (*master_pb.GetMasterConfigurationResponse, error) { - - resp := &master_pb.GetMasterConfigurationResponse{ - MetricsAddress: ms.option.MetricsAddress, - MetricsIntervalSeconds: uint32(ms.option.MetricsIntervalSec), - StorageBackends: backend.ToPbStorageBackends(), - DefaultReplication: ms.option.DefaultReplicaPlacement, - } - - return resp, nil -} diff --git a/weed/server/master_server.go b/weed/server/master_server.go index 657b170c2..cc1c4b2ad 100644 --- a/weed/server/master_server.go +++ b/weed/server/master_server.go @@ -138,14 +138,11 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) { ms.Topo.RaftServer = raftServer.raftServer ms.Topo.RaftServer.AddEventListener(raft.LeaderChangeEventType, func(e raft.Event) { - glog.V(0).Infof("event: %+v", e) + glog.V(0).Infof("leader change event: %+v => %+v", e.PrevValue(), e.Value()) if ms.Topo.RaftServer.Leader() != "" { glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "becomes leader.") } }) - ms.Topo.RaftServer.AddEventListener(raft.StateChangeEventType, func(e raft.Event) { - glog.V(0).Infof("state change: %+v", e) - }) if ms.Topo.IsLeader() { glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", "I am the leader!") } else { diff --git a/weed/server/raft_server.go b/weed/server/raft_server.go index 66a6734e3..073c1ff16 100644 --- a/weed/server/raft_server.go +++ b/weed/server/raft_server.go @@ -2,10 +2,8 @@ package weed_server import ( "encoding/json" - "io/ioutil" "os" "path" - "reflect" "sort" "time" @@ -80,11 +78,6 @@ func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, d return nil, err } - // Clear old cluster configurations if peers are changed - if oldPeers, changed := isPeersChanged(s.dataDir, serverAddr, s.peers); changed { - glog.V(0).Infof("Peers Change: %v => %v", oldPeers, s.peers) - } - stateMachine := StateMachine{topo: topo} s.raftServer, err = raft.NewServer(s.serverAddr, s.dataDir, transporter, stateMachine, topo, "") if err != nil { @@ -107,19 +100,20 @@ func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, d } // Remove deleted peers - if raftResumeState { - for existsPeerName, _ := range s.raftServer.Peers() { - exists := false - for _, peer := range s.peers { - if peer == existsPeerName { - exists = true - } + for existsPeerName := range s.raftServer.Peers() { + exists, existingPeer := false, "" + for _, peer := range s.peers { + if pb.ServerToGrpcAddress(peer) == existsPeerName { + exists, existingPeer = true, peer + break } - if !exists { - if err := s.raftServer.RemovePeer(existsPeerName); err != nil { - glog.V(0).Infoln(err) - return nil, err - } + } + if exists { + if err := s.raftServer.RemovePeer(existsPeerName); err != nil { + glog.V(0).Infoln(err) + return nil, err + } else { + glog.V(0).Infof("removing old peer %s", existingPeer) } } } @@ -128,17 +122,7 @@ func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, d if s.raftServer.IsLogEmpty() && isTheFirstOne(serverAddr, s.peers) { // Initialize the server by joining itself. - glog.V(0).Infoln("Initializing new cluster") - - _, err := s.raftServer.Do(&raft.DefaultJoinCommand{ - Name: s.raftServer.Name(), - ConnectionString: pb.ServerToGrpcAddress(s.serverAddr), - }) - - if err != nil { - glog.V(0).Infoln(err) - return nil, err - } + // s.DoJoinCommand() } glog.V(0).Infof("current cluster leader: %v", s.raftServer.Leader()) @@ -156,34 +140,6 @@ func (s *RaftServer) Peers() (members []string) { return } -func isPeersChanged(dir string, self string, peers []string) (oldPeers []string, changed bool) { - confPath := path.Join(dir, "conf") - // open conf file - b, err := ioutil.ReadFile(confPath) - if err != nil { - return oldPeers, true - } - conf := &raft.Config{} - if err = json.Unmarshal(b, conf); err != nil { - return oldPeers, true - } - - for _, p := range conf.Peers { - oldPeers = append(oldPeers, p.Name) - } - oldPeers = append(oldPeers, self) - - if len(peers) == 0 && len(oldPeers) <= 1 { - return oldPeers, false - } - - sort.Strings(peers) - sort.Strings(oldPeers) - - return oldPeers, !reflect.DeepEqual(peers, oldPeers) - -} - func isTheFirstOne(self string, peers []string) bool { sort.Strings(peers) if len(peers) <= 0 { @@ -191,3 +147,16 @@ func isTheFirstOne(self string, peers []string) bool { } return self == peers[0] } + +func (s *RaftServer) DoJoinCommand() { + + glog.V(0).Infoln("Initializing new cluster") + + if _, err := s.raftServer.Do(&raft.DefaultJoinCommand{ + Name: s.raftServer.Name(), + ConnectionString: pb.ServerToGrpcAddress(s.serverAddr), + }); err != nil { + glog.Errorf("fail to send join command: %v", err) + } + +} diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go index 3d23d8f13..7b0f73ce9 100644 --- a/weed/wdclient/masterclient.go +++ b/weed/wdclient/masterclient.go @@ -52,6 +52,32 @@ func (mc *MasterClient) KeepConnectedToMaster() { } } +func (mc *MasterClient) FindLeader(myMasterAddress string) (leader string) { + for _, master := range mc.masters { + if master == myMasterAddress { + continue + } + if grpcErr := pb.WithMasterClient(master, mc.grpcDialOption, func(client master_pb.SeaweedClient) error { + ctx, cancel := context.WithTimeout(context.Background(), 120*time.Millisecond) + defer cancel() + resp, err := client.GetMasterConfiguration(ctx, &master_pb.GetMasterConfigurationRequest{}) + if err != nil { + return err + } + leader = resp.Leader + return nil + }); grpcErr != nil { + glog.V(0).Infof("connect to %s: %v", master, grpcErr) + } + if leader != "" { + glog.V(0).Infof("existing leader is %s", leader) + return + } + } + glog.V(0).Infof("No existing leader found!") + return +} + func (mc *MasterClient) tryAllMasters() { nextHintedLeader := "" for _, master := range mc.masters { @@ -75,7 +101,7 @@ func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader stri stream, err := client.KeepConnected(ctx) if err != nil { - glog.V(0).Infof("%s masterClient failed to keep connected to %s: %v", mc.clientType, master, err) + glog.V(1).Infof("%s masterClient failed to keep connected to %s: %v", mc.clientType, master, err) return err } @@ -118,7 +144,7 @@ func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader stri }) if gprcErr != nil { - glog.V(0).Infof("%s masterClient failed to connect with master %v: %v", mc.clientType, master, gprcErr) + glog.V(1).Infof("%s masterClient failed to connect with master %v: %v", mc.clientType, master, gprcErr) } return }