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master: redirect clients to the new leader

pull/1026/head
Chris Lu 5 years ago
parent
8afd8d35b3
commit
19360ab10a
4 changed files with 210 additions and 168 deletions
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  1. 5
      weed/pb/master.proto
  2. 267
      weed/pb/master_pb/master.pb.go
  3. 18
      weed/server/master_grpc_server.go
  4. 88
      weed/wdclient/masterclient.go

5
weed/pb/master.proto
View File

@ -7,7 +7,7 @@ package master_pb;
service Seaweed {
rpc SendHeartbeat (stream Heartbeat) returns (stream HeartbeatResponse) {
}
rpc KeepConnected (stream ClientListenRequest) returns (stream VolumeLocation) {
rpc KeepConnected (stream KeepConnectedRequest) returns (stream VolumeLocation) {
}
rpc LookupVolume (LookupVolumeRequest) returns (LookupVolumeResponse) {
}
@ -101,7 +101,7 @@ message SuperBlockExtra {
ErasureCoding erasure_coding = 1;
}
message ClientListenRequest {
message KeepConnectedRequest {
string name = 1;
}
@ -110,6 +110,7 @@ message VolumeLocation {
string public_url = 2;
repeated uint32 new_vids = 3;
repeated uint32 deleted_vids = 4;
string leader = 5; // optional when leader is not itself
}
message LookupVolumeRequest {

267
weed/pb/master_pb/master.pb.go
View File

@ -16,7 +16,7 @@ It has these top-level messages:
VolumeEcShardInformationMessage
Empty
SuperBlockExtra
ClientListenRequest
KeepConnectedRequest
VolumeLocation
LookupVolumeRequest
LookupVolumeResponse
@ -485,16 +485,16 @@ func (m *SuperBlockExtra_ErasureCoding) GetVolumeIds() []uint32 {
return nil
}
type ClientListenRequest struct {
type KeepConnectedRequest struct {
Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
}
func (m *ClientListenRequest) Reset() { *m = ClientListenRequest{} }
func (m *ClientListenRequest) String() string { return proto.CompactTextString(m) }
func (*ClientListenRequest) ProtoMessage() {}
func (*ClientListenRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7} }
func (m *KeepConnectedRequest) Reset() { *m = KeepConnectedRequest{} }
func (m *KeepConnectedRequest) String() string { return proto.CompactTextString(m) }
func (*KeepConnectedRequest) ProtoMessage() {}
func (*KeepConnectedRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7} }
func (m *ClientListenRequest) GetName() string {
func (m *KeepConnectedRequest) GetName() string {
if m != nil {
return m.Name
}
@ -506,6 +506,7 @@ type VolumeLocation struct {
PublicUrl string `protobuf:"bytes,2,opt,name=public_url,json=publicUrl" json:"public_url,omitempty"`
NewVids []uint32 `protobuf:"varint,3,rep,packed,name=new_vids,json=newVids" json:"new_vids,omitempty"`
DeletedVids []uint32 `protobuf:"varint,4,rep,packed,name=deleted_vids,json=deletedVids" json:"deleted_vids,omitempty"`
Leader string `protobuf:"bytes,5,opt,name=leader" json:"leader,omitempty"`
}
func (m *VolumeLocation) Reset() { *m = VolumeLocation{} }
@ -541,6 +542,13 @@ func (m *VolumeLocation) GetDeletedVids() []uint32 {
return nil
}
func (m *VolumeLocation) GetLeader() string {
if m != nil {
return m.Leader
}
return ""
}
type LookupVolumeRequest struct {
VolumeIds []string `protobuf:"bytes,1,rep,name=volume_ids,json=volumeIds" json:"volume_ids,omitempty"`
Collection string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
@ -1327,7 +1335,7 @@ func init() {
proto.RegisterType((*Empty)(nil), "master_pb.Empty")
proto.RegisterType((*SuperBlockExtra)(nil), "master_pb.SuperBlockExtra")
proto.RegisterType((*SuperBlockExtra_ErasureCoding)(nil), "master_pb.SuperBlockExtra.ErasureCoding")
proto.RegisterType((*ClientListenRequest)(nil), "master_pb.ClientListenRequest")
proto.RegisterType((*KeepConnectedRequest)(nil), "master_pb.KeepConnectedRequest")
proto.RegisterType((*VolumeLocation)(nil), "master_pb.VolumeLocation")
proto.RegisterType((*LookupVolumeRequest)(nil), "master_pb.LookupVolumeRequest")
proto.RegisterType((*LookupVolumeResponse)(nil), "master_pb.LookupVolumeResponse")
@ -1428,7 +1436,7 @@ func (c *seaweedClient) KeepConnected(ctx context.Context, opts ...grpc.CallOpti
}
type Seaweed_KeepConnectedClient interface {
Send(*ClientListenRequest) error
Send(*KeepConnectedRequest) error
Recv() (*VolumeLocation, error)
grpc.ClientStream
}
@ -1437,7 +1445,7 @@ type seaweedKeepConnectedClient struct {
grpc.ClientStream
}
func (x *seaweedKeepConnectedClient) Send(m *ClientListenRequest) error {
func (x *seaweedKeepConnectedClient) Send(m *KeepConnectedRequest) error {
return x.ClientStream.SendMsg(m)
}
@ -1572,7 +1580,7 @@ func _Seaweed_KeepConnected_Handler(srv interface{}, stream grpc.ServerStream) e
type Seaweed_KeepConnectedServer interface {
Send(*VolumeLocation) error
Recv() (*ClientListenRequest, error)
Recv() (*KeepConnectedRequest, error)
grpc.ServerStream
}
@ -1584,8 +1592,8 @@ func (x *seaweedKeepConnectedServer) Send(m *VolumeLocation) error {
return x.ServerStream.SendMsg(m)
}
func (x *seaweedKeepConnectedServer) Recv() (*ClientListenRequest, error) {
m := new(ClientListenRequest)
func (x *seaweedKeepConnectedServer) Recv() (*KeepConnectedRequest, error) {
m := new(KeepConnectedRequest)
if err := x.ServerStream.RecvMsg(m); err != nil {
return nil, err
}
@ -1793,123 +1801,124 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
func init() { proto.RegisterFile("master.proto", fileDescriptor0) }
var fileDescriptor0 = []byte{
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0x00,
}

18
weed/server/master_grpc_server.go
View File

@ -176,7 +176,7 @@ func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServ
}
if !ms.Topo.IsLeader() {
return raft.NotLeaderError
return ms.informNewLeader(stream)
}
// remember client address
@ -236,7 +236,7 @@ func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServ
}
case <-ticker.C:
if !ms.Topo.IsLeader() {
return raft.NotLeaderError
return ms.informNewLeader(stream)
}
case <-stopChan:
return nil
@ -245,3 +245,17 @@ func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServ
return nil
}
func (ms *MasterServer) informNewLeader(stream master_pb.Seaweed_KeepConnectedServer) error {
leader, err := ms.Topo.Leader()
if err != nil {
glog.Error("topo leader: %v", err)
return raft.NotLeaderError
}
if err := stream.Send(&master_pb.VolumeLocation{
Leader: leader,
}); err != nil {
return err
}
return nil
}

88
weed/wdclient/masterclient.go
View File

@ -51,54 +51,72 @@ func (mc *MasterClient) KeepConnectedToMaster() {
}
func (mc *MasterClient) tryAllMasters() {
nextHintedLeader := ""
for _, master := range mc.masters {
glog.V(1).Infof("%s Connecting to master %v", mc.name, master)
gprcErr := withMasterClient(context.Background(), master, mc.grpcDialOption, func(ctx context.Context, client master_pb.SeaweedClient) error {
stream, err := client.KeepConnected(ctx)
nextHintedLeader = mc.tryConnectToMaster(master)
for nextHintedLeader != "" {
nextHintedLeader = mc.tryConnectToMaster(nextHintedLeader)
}
mc.currentMaster = ""
}
}
func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader string) {
glog.V(1).Infof("%s Connecting to master %v", mc.name, master)
gprcErr := withMasterClient(context.Background(), master, mc.grpcDialOption, func(ctx context.Context, client master_pb.SeaweedClient) error {
stream, err := client.KeepConnected(ctx)
if err != nil {
glog.V(0).Infof("%s failed to keep connected to %s: %v", mc.name, master, err)
return err
}
if err = stream.Send(&master_pb.KeepConnectedRequest{Name: mc.name}); err != nil {
glog.V(0).Infof("%s failed to send to %s: %v", mc.name, master, err)
return err
}
if mc.currentMaster == "" {
glog.V(1).Infof("%s Connected to %v", mc.name, master)
mc.currentMaster = master
}
for {
volumeLocation, err := stream.Recv()
if err != nil {
glog.V(0).Infof("%s failed to keep connected to %s: %v", mc.name, master, err)
glog.V(0).Infof("%s failed to receive from %s: %v", mc.name, master, err)
return err
}
if err = stream.Send(&master_pb.ClientListenRequest{Name: mc.name}); err != nil {
glog.V(0).Infof("%s failed to send to %s: %v", mc.name, master, err)
return err
// maybe the leader is changed
if volumeLocation.Leader != "" {
glog.V(1).Infof("redirected to leader %v", volumeLocation.Leader)
nextHintedLeader = volumeLocation.Leader
return nil
}
if mc.currentMaster == "" {
glog.V(1).Infof("%s Connected to %v", mc.name, master)
mc.currentMaster = master
// process new volume location
loc := Location{
Url: volumeLocation.Url,
PublicUrl: volumeLocation.PublicUrl,
}
for {
if volumeLocation, err := stream.Recv(); err != nil {
glog.V(0).Infof("%s failed to receive from %s: %v", mc.name, master, err)
return err
} else {
loc := Location{
Url: volumeLocation.Url,
PublicUrl: volumeLocation.PublicUrl,
}
for _, newVid := range volumeLocation.NewVids {
glog.V(1).Infof("%s: %s adds volume %d", mc.name, loc.Url, newVid)
mc.addLocation(newVid, loc)
}
for _, deletedVid := range volumeLocation.DeletedVids {
glog.V(1).Infof("%s: %s removes volume %d", mc.name, loc.Url, deletedVid)
mc.deleteLocation(deletedVid, loc)
}
}
for _, newVid := range volumeLocation.NewVids {
glog.V(1).Infof("%s: %s adds volume %d", mc.name, loc.Url, newVid)
mc.addLocation(newVid, loc)
}
for _, deletedVid := range volumeLocation.DeletedVids {
glog.V(1).Infof("%s: %s removes volume %d", mc.name, loc.Url, deletedVid)
mc.deleteLocation(deletedVid, loc)
}
})
if gprcErr != nil {
glog.V(0).Infof("%s failed to connect with master %v: %v", mc.name, master, gprcErr)
}
mc.currentMaster = ""
})
if gprcErr != nil {
glog.V(0).Infof("%s failed to connect with master %v: %v", mc.name, master, gprcErr)
}
return
}
func withMasterClient(ctx context.Context, master string, grpcDialOption grpc.DialOption, fn func(ctx context.Context, client master_pb.SeaweedClient) error) error {

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