seaweedfs/weed/command/master_follower.go

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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"
"time"
)
var (
mf MasterOptions
)
func init() {
cmdMasterFollower.Run = runMasterFollower // break init cycle
mf.port = cmdMasterFollower.Flag.Int("port", 9334, "http listen port")
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mf.portGrpc = cmdMasterFollower.Flag.Int("port.grpc", 19334, "grpc 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 := pb.ServerAddresses(*mf.peers).ToAddresses()
var err error
grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.master")
for i := 0; i < 10; i++ {
err = pb.WithOneOfGrpcMasterClients(masters, 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", masters, 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", masters, 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", masters, err)
return
}
option := masterOptions.toMasterOption(nil)
option.IsFollower = true
r := mux.NewRouter()
ms := weed_server.NewMasterServer(r, option, masters)
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listeningAddress := util.JoinHostPort(*masterOptions.ipBind, *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
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grpcPort := *masterOptions.portGrpc
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grpcL, err := util.NewListener(util.JoinHostPort(*masterOptions.ipBind, 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 {}
}