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master: add master.follower to handle read file id lookup requests

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This commit is contained in:
Chris Lu 2021-08-12 18:10:59 -07:00
parent 5469019852
commit 5571f4f70a
8 changed files with 306 additions and 116 deletions
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5
weed/Makefile
View file

@ -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

1
weed/command/command.go
View file

@ -28,6 +28,7 @@ var Commands = []*Command{
cmdFuse,
cmdGateway,
cmdMaster,
cmdMasterFollower,
cmdMount,
cmdS3,
cmdIam,

145
weed/command/master_follower.go Normal file
View file

@ -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=<master1Host>:<master1Port>",
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 {}
}

15
weed/pb/grpc_client_server.go
View file

@ -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 {

2
weed/pb/master.proto
View file

@ -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 {

241
weed/pb/master_pb/master.pb.go
View file

@ -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 protoimpl.SizeCache
@ -3251,7 +3267,7 @@ var file_master_proto_rawDesc = []byte{
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@ -3268,16 +3284,38 @@ var file_master_proto_rawDesc = []byte{
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0x33,
}
var (

4
weed/server/master_grpc_server_volume.go
View file

@ -68,10 +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)

9
weed/server/master_server.go
View file

@ -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)
}
}
}