fix: restore raft state

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/aws/aws-sdk-go v1.33.5
 	github.com/buraksezer/consistent v0.0.0-20191006190839-693edf70fd72
 	github.com/cespare/xxhash v1.1.0
-	github.com/chrislusf/raft v1.0.1
+	github.com/chrislusf/raft v1.0.2-0.20201002174524-b13c3bfdb011
 	github.com/coreos/go-semver v0.3.0 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/disintegration/imaging v1.6.2

go.sum

@@ -69,6 +69,8 @@ github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/chrislusf/raft v1.0.1 h1:Wa4ffkmkysW7cX3T/gMC/Mk3PhnOXhsqOVwQJcMndhw=
 github.com/chrislusf/raft v1.0.1/go.mod h1:Ep5DP+mJSosjfKiix1uU7Lc2Df/SX4oGJEpZlXH5l68=
+github.com/chrislusf/raft v1.0.2-0.20201002174524-b13c3bfdb011 h1:vN1GvfLgDg8kIPCdhuVKAjlYpxG1B86jiKejB6MC/Q0=
+github.com/chrislusf/raft v1.0.2-0.20201002174524-b13c3bfdb011/go.mod h1:Ep5DP+mJSosjfKiix1uU7Lc2Df/SX4oGJEpZlXH5l68=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa h1:OaNxuTZr7kxeODyLWsRMC+OD03aFUH+mW6r2d+MWa5Y=

weed/command/master.go

@@ -41,7 +41,7 @@ type MasterOptions struct {
 	disableHttp        *bool
 	metricsAddress     *string
 	metricsIntervalSec *int
-	removeRaftState    *bool
+	raftResumeState    *bool
 }
 
 func init() {
@@ -60,7 +60,7 @@ func init() {
 	m.disableHttp = cmdMaster.Flag.Bool("disableHttp", false, "disable http requests, only gRPC operations are allowed.")
 	m.metricsAddress = cmdMaster.Flag.String("metrics.address", "", "Prometheus gateway address <host>:<port>")
 	m.metricsIntervalSec = cmdMaster.Flag.Int("metrics.intervalSeconds", 15, "Prometheus push interval in seconds")
-	m.removeRaftState = cmdMaster.Flag.Bool("raft.removeState", true, "remove raft state on start master server")
+	m.raftResumeState = cmdMaster.Flag.Bool("raft.resumeState", false, "resume state of raft on start master server")
 }
 
 var cmdMaster = &Command{
@@ -121,7 +121,7 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	}
 	// start raftServer
 	raftServer, err := weed_server.NewRaftServer(security.LoadClientTLS(util.GetViper(), "grpc.master"),
-		peers, myMasterAddress, util.ResolvePath(*masterOption.metaFolder), ms.Topo, 5, *masterOption.removeRaftState)
+		peers, myMasterAddress, util.ResolvePath(*masterOption.metaFolder), ms.Topo, 5, *masterOption.raftResumeState)
 	if raftServer == nil {
 		glog.Fatalf("please verify %s is writable, see https://github.com/chrislusf/seaweedfs/issues/717: %s", *masterOption.metaFolder, err)
 	}

weed/server/raft_server.go

@@ -52,7 +52,7 @@ func (s StateMachine) Recovery(data []byte) error {
 	return nil
 }
 
-func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, dataDir string, topo *topology.Topology, pulseSeconds int, cleanState bool) (*RaftServer, error) {
+func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, dataDir string, topo *topology.Topology, pulseSeconds int, raftResumeState bool) (*RaftServer, error) {
 	s := &RaftServer{
 		peers:      peers,
 		serverAddr: serverAddr,
@@ -70,7 +70,7 @@ func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, d
 	transporter := raft.NewGrpcTransporter(grpcDialOption)
 	glog.V(0).Infof("Starting RaftServer with %v", serverAddr)
 
-	if cleanState {
+	if !raftResumeState {
 		// always clear previous metadata
 		os.RemoveAll(path.Join(s.dataDir, "conf"))
 		os.RemoveAll(path.Join(s.dataDir, "log"))