From 5571f4f70a2e304343e76638caacc3bd0338a8d1 Mon Sep 17 00:00:00 2001 From: Chris Lu Date: Thu, 12 Aug 2021 18:10:59 -0700 Subject: [PATCH] master: add master.follower to handle read file id lookup requests --- weed/Makefile | 5 + weed/command/command.go | 1 + weed/command/master_follower.go | 145 ++++++++++++++ weed/pb/grpc_client_server.go | 15 ++ weed/pb/master.proto | 2 + weed/pb/master_pb/master.pb.go | 241 +++++++++++++---------- weed/server/master_grpc_server_volume.go | 4 - weed/server/master_server.go | 9 +- 8 files changed, 306 insertions(+), 116 deletions(-) create mode 100644 weed/command/master_follower.go diff --git a/weed/Makefile b/weed/Makefile index ad1f0b6f9..205104969 100644 --- a/weed/Makefile +++ b/weed/Makefile @@ -41,3 +41,8 @@ debug_filer_copy: debug_filer_remote_sync: go build -gcflags="all=-N -l" dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 filer.remote.sync -filer="localhost:8888" -dir=/buckets/b2 -timeAgo=10000h + +debug_master_follower: + go build -gcflags="all=-N -l" + dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 master.follower + diff --git a/weed/command/command.go b/weed/command/command.go index 02de2bd35..a3fdcfc6f 100644 --- a/weed/command/command.go +++ b/weed/command/command.go @@ -28,6 +28,7 @@ var Commands = []*Command{ cmdFuse, cmdGateway, cmdMaster, + cmdMasterFollower, cmdMount, cmdS3, cmdIam, diff --git a/weed/command/master_follower.go b/weed/command/master_follower.go new file mode 100644 index 000000000..949743b3e --- /dev/null +++ b/weed/command/master_follower.go @@ -0,0 +1,145 @@ +package command + +import ( + "context" + "fmt" + "github.com/aws/aws-sdk-go/aws" + "github.com/chrislusf/seaweedfs/weed/glog" + "github.com/chrislusf/seaweedfs/weed/pb" + "github.com/chrislusf/seaweedfs/weed/pb/master_pb" + "github.com/chrislusf/seaweedfs/weed/security" + "github.com/chrislusf/seaweedfs/weed/server" + "github.com/chrislusf/seaweedfs/weed/util" + "github.com/gorilla/mux" + "google.golang.org/grpc/reflection" + "net/http" + "strconv" + "strings" + "time" +) + +var ( + mf MasterOptions +) + +func init() { + cmdMasterFollower.Run = runMasterFollower // break init cycle + mf.port = cmdMasterFollower.Flag.Int("port", 9334, "http listen port") + mf.ipBind = cmdMasterFollower.Flag.String("ip.bind", "", "ip address to bind to") + mf.peers = cmdMasterFollower.Flag.String("masters", "localhost:9333", "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") + + mf.ip = aws.String(util.DetectedHostAddress()) + mf.metaFolder = aws.String("") + mf.volumeSizeLimitMB = nil + mf.volumePreallocate = nil + mf.defaultReplication = nil + mf.garbageThreshold = aws.Float64(0.1) + mf.whiteList = nil + mf.disableHttp = aws.Bool(false) + mf.metricsAddress = aws.String("") + mf.metricsIntervalSec = aws.Int(0) + mf.raftResumeState = aws.Bool(false) +} + +var cmdMasterFollower = &Command{ + UsageLine: "master.follower -port=9333 -masters=:", + Short: "start a master follower", + Long: `start a master follower to provide volume=>location mapping service + + The master follower does not participate in master election. + It just follow the existing masters, and listen for any volume location changes. + + In most cases, the master follower is not needed. In big data centers with thousands of volume + servers. In theory, the master may have trouble to keep up with the write requests and read requests. + + The master follower can relieve the master from from read requests, which only needs to + lookup a fileId or volumeId. + + The master follower currently can handle fileId lookup requests: + /dir/lookup?volumeId=4 + /dir/lookup?fileId=4,49c50924569199 + And gRPC API + rpc LookupVolume (LookupVolumeRequest) returns (LookupVolumeResponse) {} + + This master follower is stateless and can run from any place. + + `, +} + +func runMasterFollower(cmd *Command, args []string) bool { + + util.LoadConfiguration("security", false) + util.LoadConfiguration("master", false) + + startMasterFollower(mf) + + return true +} + +func startMasterFollower(masterOptions MasterOptions) { + + // collect settings from main masters + masters := strings.Split(*mf.peers, ",") + masterGrpcAddresses, err := pb.ParseServersToGrpcAddresses(masters) + if err != nil { + glog.V(0).Infof("ParseFilerGrpcAddress: %v", err) + return + } + + grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.master") + for i := 0; i < 10; i++ { + err = pb.WithOneOfGrpcMasterClients(masterGrpcAddresses, grpcDialOption, func(client master_pb.SeaweedClient) error { + resp, err := client.GetMasterConfiguration(context.Background(), &master_pb.GetMasterConfigurationRequest{}) + if err != nil { + return fmt.Errorf("get master grpc address %v configuration: %v", masterGrpcAddresses, err) + } + masterOptions.defaultReplication = &resp.DefaultReplication + masterOptions.volumeSizeLimitMB = aws.Uint(uint(resp.VolumeSizeLimitMB)) + masterOptions.volumePreallocate = &resp.VolumePreallocate + return nil + }) + if err != nil { + glog.V(0).Infof("failed to talk to filer %v: %v", masterGrpcAddresses, err) + glog.V(0).Infof("wait for %d seconds ...", i+1) + time.Sleep(time.Duration(i+1) * time.Second) + } + } + if err != nil { + glog.Errorf("failed to talk to filer %v: %v", masterGrpcAddresses, err) + return + } + + + option := masterOptions.toMasterOption(nil) + option.IsFollower = true + + + r := mux.NewRouter() + ms := weed_server.NewMasterServer(r, option, masters) + listeningAddress := *masterOptions.ipBind + ":" + strconv.Itoa(*masterOptions.port) + glog.V(0).Infof("Start Seaweed Master %s at %s", util.Version(), listeningAddress) + masterListener, e := util.NewListener(listeningAddress, 0) + if e != nil { + glog.Fatalf("Master startup error: %v", e) + } + + // starting grpc server + grpcPort := *masterOptions.port + 10000 + grpcL, err := util.NewListener(*masterOptions.ipBind+":"+strconv.Itoa(grpcPort), 0) + if err != nil { + glog.Fatalf("master failed to listen on grpc port %d: %v", grpcPort, err) + } + grpcS := pb.NewGrpcServer(security.LoadServerTLS(util.GetViper(), "grpc.master")) + master_pb.RegisterSeaweedServer(grpcS, ms) + reflection.Register(grpcS) + glog.V(0).Infof("Start Seaweed Master %s grpc server at %s:%d", util.Version(), *masterOptions.ip, grpcPort) + go grpcS.Serve(grpcL) + + go ms.MasterClient.KeepConnectedToMaster() + + // start http server + httpS := &http.Server{Handler: r} + go httpS.Serve(masterListener) + + select {} +} diff --git a/weed/pb/grpc_client_server.go b/weed/pb/grpc_client_server.go index fac8adcb3..15dc917e9 100644 --- a/weed/pb/grpc_client_server.go +++ b/weed/pb/grpc_client_server.go @@ -213,6 +213,21 @@ func WithMasterClient(master string, grpcDialOption grpc.DialOption, fn func(cli } +func WithOneOfGrpcMasterClients(masterGrpcAddresses []string, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) (err error) { + + for _, masterGrpcAddress := range masterGrpcAddresses { + err = WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error { + client := master_pb.NewSeaweedClient(grpcConnection) + return fn(client) + }, masterGrpcAddress, grpcDialOption) + if err == nil { + return nil + } + } + + return err +} + func WithBrokerGrpcClient(brokerGrpcAddress string, grpcDialOption grpc.DialOption, fn func(client messaging_pb.SeaweedMessagingClient) error) error { return WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error { diff --git a/weed/pb/master.proto b/weed/pb/master.proto index 6ef27fb4d..ce8a6dc12 100644 --- a/weed/pb/master.proto +++ b/weed/pb/master.proto @@ -275,6 +275,8 @@ message GetMasterConfigurationResponse { repeated StorageBackend storage_backends = 3; string default_replication = 4; string leader = 5; + uint32 volume_size_limit_m_b = 6; + bool volume_preallocate = 7; } message ListMasterClientsRequest { diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go index 75e165ed6..46dad9325 100644 --- a/weed/pb/master_pb/master.pb.go +++ b/weed/pb/master_pb/master.pb.go @@ -2297,6 +2297,8 @@ type GetMasterConfigurationResponse struct { 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"` + VolumeSizeLimitMB uint32 `protobuf:"varint,6,opt,name=volume_size_limit_m_b,json=volumeSizeLimitMB,proto3" json:"volume_size_limit_m_b,omitempty"` + VolumePreallocate bool `protobuf:"varint,7,opt,name=volume_preallocate,json=volumePreallocate,proto3" json:"volume_preallocate,omitempty"` } func (x *GetMasterConfigurationResponse) Reset() { @@ -2366,6 +2368,20 @@ func (x *GetMasterConfigurationResponse) GetLeader() string { return "" } +func (x *GetMasterConfigurationResponse) GetVolumeSizeLimitMB() uint32 { + if x != nil { + return x.VolumeSizeLimitMB + } + return 0 +} + +func (x *GetMasterConfigurationResponse) GetVolumePreallocate() bool { + if x != nil { + return x.VolumePreallocate + } + return false +} + type ListMasterClientsRequest struct { state protoimpl.MessageState sizeCache 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+68,6 @@ func (ms *MasterServer) ProcessGrowRequest() { func (ms *MasterServer) LookupVolume(ctx context.Context, req *master_pb.LookupVolumeRequest) (*master_pb.LookupVolumeResponse, error) { - if !ms.Topo.IsLeader() { - return nil, raft.NotLeaderError - } - resp := &master_pb.LookupVolumeResponse{} volumeLocations := ms.lookupVolumeId(req.VolumeIds, req.Collection) diff --git a/weed/server/master_server.go b/weed/server/master_server.go index 273d6ba7d..d2edeb6cb 100644 --- a/weed/server/master_server.go +++ b/weed/server/master_server.go @@ -44,6 +44,7 @@ type MasterOption struct { DisableHttp bool MetricsAddress string MetricsIntervalSec int + IsFollower bool } type MasterServer struct { @@ -145,7 +146,9 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste ms.ProcessGrowRequest() - ms.startAdminScripts() + if !option.IsFollower { + ms.startAdminScripts() + } return ms } @@ -193,8 +196,8 @@ func (ms *MasterServer) proxyToLeader(f http.HandlerFunc) http.HandlerFunc { proxy.Transport = util.Transport proxy.ServeHTTP(w, r) } else { - // drop it to the floor - // writeJsonError(w, r, errors.New(ms.Topo.RaftServer.Name()+" does not know Leader yet:"+ms.Topo.RaftServer.Leader())) + // handle requests locally + f(w, r) } } }