fix removing old raft server

5 files changed, 186 insertions, 137 deletions

diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index bb43f833e..c0974b789 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -353,6 +353,7 @@ message RaftAddServerResponse {
 
 message RaftRemoveServerRequest {
   string id = 1;
+  bool force = 2;
 }
 message RaftRemoveServerResponse {
 }
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index a39b1e953..85ed7e059 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -3067,7 +3067,8 @@ type RaftRemoveServerRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Id    string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Force bool   `protobuf:"varint,2,opt,name=force,proto3" json:"force,omitempty"`
 }
 
 func (x *RaftRemoveServerRequest) Reset() {
@@ -3109,6 +3110,13 @@ func (x *RaftRemoveServerRequest) GetId() string {
 	return ""
 }
 
+func (x *RaftRemoveServerRequest) GetForce() bool {
+	if x != nil {
+		return x.Force
+	}
+	return false
+}
+
 type RaftRemoveServerResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3491,7 +3499,7 @@ type RaftListClusterServersResponse_ClusterServers struct {
 
 	Id       string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
 	Address  string `protobuf:"bytes,2,opt,name=address,proto3" json:"address,omitempty"`
-	Suffrage string `protobuf:"bytes,3,opt,name=suffrage,proto3" json:"suffrage,omitempty"`
+	Suffrage string `protobuf:"bytes,3,opt,name=suffrage,proto3" json:"suffrage,omitempty"` //
 }
 
 func (x *RaftListClusterServersResponse_ClusterServers) Reset() {
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+	0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x32, 0x5a, 0x30, 0x67, 0x69,
+	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75,
+	0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65,
+	0x64, 0x2f, 0x70, 0x62, 0x2f, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/weed/server/master_grpc_server_raft.go b/weed/server/master_grpc_server_raft.go
index 71ab6a1da..37491b3df 100644
--- a/weed/server/master_grpc_server_raft.go
+++ b/weed/server/master_grpc_server_raft.go
@@ -2,6 +2,8 @@ package weed_server
 
 import (
 	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/hashicorp/raft"
 )
@@ -23,6 +25,9 @@ func (ms *MasterServer) RaftListClusterServers(ctx context.Context, req *master_
 
 func (ms *MasterServer) RaftAddServer(ctx context.Context, req *master_pb.RaftAddServerRequest) (*master_pb.RaftAddServerResponse, error) {
 	resp := &master_pb.RaftAddServerResponse{}
+	if ms.Topo.HashicorpRaft.State() != raft.Leader {
+		return nil, fmt.Errorf("raft add server %s failed: %s is no current leader", req.Id, ms.Topo.HashicorpRaft.String())
+	}
 
 	var idxFuture raft.IndexFuture
 	if req.Voter {
@@ -40,6 +45,19 @@ func (ms *MasterServer) RaftAddServer(ctx context.Context, req *master_pb.RaftAd
 func (ms *MasterServer) RaftRemoveServer(ctx context.Context, req *master_pb.RaftRemoveServerRequest) (*master_pb.RaftRemoveServerResponse, error) {
 	resp := &master_pb.RaftRemoveServerResponse{}
 
+	if ms.Topo.HashicorpRaft.State() != raft.Leader {
+		return nil, fmt.Errorf("raft remove server %s failed: %s is no current leader", req.Id, ms.Topo.HashicorpRaft.String())
+	}
+
+	if !req.Force {
+		ms.clientChansLock.RLock()
+		_, ok := ms.clientChans[fmt.Sprintf("%s@%s", cluster.MasterType, req.Id)]
+		ms.clientChansLock.RUnlock()
+		if ok {
+			return resp, fmt.Errorf("raft remove server %s failed: client connection to master exists", req.Id)
+		}
+	}
+
 	idxFuture := ms.Topo.HashicorpRaft.RemoveServer(raft.ServerID(req.Id), 0, 0)
 	if err := idxFuture.Error(); err != nil {
 		return nil, err
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index 2c626b511..0aba7b957 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -34,7 +34,7 @@ import (
 const (
 	SequencerType         = "master.sequencer.type"
 	SequencerSnowflakeId  = "master.sequencer.sequencer_snowflake_id"
-	RaftServerRemovalTime = 72 * time.Hour
+	RaftServerRemovalTime = 72 * time.Minute
 )
 
 type MasterOption struct {
@@ -64,7 +64,9 @@ type MasterServer struct {
 	vgCh chan *topology.VolumeGrowRequest
 
 	boundedLeaderChan chan int
-	onPeerUpdatDoneCn chan string
+
+	onPeerUpdatDoneCn      chan string
+	onPeerUpdatDoneCnExist bool
 
 	// notifying clients
 	clientChansLock sync.RWMutex
@@ -117,6 +119,7 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers map[string]pb.Se
 	}
 	ms.boundedLeaderChan = make(chan int, 16)
 	ms.onPeerUpdatDoneCn = make(chan string)
+
 	ms.MasterClient.OnPeerUpdate = ms.OnPeerUpdate
 
 	seq := ms.createSequencer(option)
@@ -336,32 +339,48 @@ func (ms *MasterServer) OnPeerUpdate(update *master_pb.ClusterNodeUpdate) {
 		return
 	}
 	peerAddress := pb.ServerAddress(update.Address)
+	peerName := string(peerAddress)
 	if update.IsAdd {
 		if ms.Topo.HashicorpRaft.State() == hashicorpRaft.Leader {
-			glog.V(0).Infof("adding new raft server: %s", peerAddress.String())
-			ms.Topo.HashicorpRaft.AddVoter(
-				hashicorpRaft.ServerID(peerAddress.String()),
-				hashicorpRaft.ServerAddress(peerAddress.ToGrpcAddress()), 0, 0)
+			raftServerFound := false
+			for _, server := range ms.Topo.HashicorpRaft.GetConfiguration().Configuration().Servers {
+				if string(server.ID) == peerName {
+					raftServerFound = true
+				}
+			}
+			if !raftServerFound {
+				glog.V(0).Infof("adding new raft server: %s", peerAddress.String())
+				ms.Topo.HashicorpRaft.AddVoter(
+					hashicorpRaft.ServerID(peerName),
+					hashicorpRaft.ServerAddress(peerAddress.ToGrpcAddress()), 0, 0)
+			}
+		}
+		if ms.onPeerUpdatDoneCnExist {
+			ms.onPeerUpdatDoneCn <- string(peerAddress)
 		}
-		ms.onPeerUpdatDoneCn <- string(peerAddress)
 	} else if ms.Topo.HashicorpRaft.State() == hashicorpRaft.Leader {
 		go func(peerName string) {
 			for {
 				select {
-				case peerDone := <-ms.onPeerUpdatDoneCn:
-					if peerName == peerDone {
-						return
-					}
 				case <-time.After(RaftServerRemovalTime):
-					glog.V(0).Infof("removing old raft server: %s", peerName)
-					if _, err := ms.RaftRemoveServer(context.Background(), &master_pb.RaftRemoveServerRequest{
-						Id: peerName,
-					}); err != nil {
+					err := ms.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
+						_, err := client.RaftRemoveServer(context.Background(), &master_pb.RaftRemoveServerRequest{
+							Id:    peerName,
+							Force: false,
+						})
+						return err
+					})
+					if err != nil {
 						glog.Warningf("failed removing old raft server: %v", err)
 					}
 					return
+				case peerDone := <-ms.onPeerUpdatDoneCn:
+					if peerName == peerDone {
+						return
+					}
 				}
 			}
 		}(string(peerAddress))
+		ms.onPeerUpdatDoneCnExist = true
 	}
 }
diff --git a/weed/shell/command_raft_server_remove.go b/weed/shell/command_raft_server_remove.go
index 3bb83ac43..56b527478 100644
--- a/weed/shell/command_raft_server_remove.go
+++ b/weed/shell/command_raft_server_remove.go
@@ -41,7 +41,8 @@ func (c *commandRaftServerRemove) Do(args []string, commandEnv *CommandEnv, writ
 
 	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
 		_, err := client.RaftRemoveServer(context.Background(), &master_pb.RaftRemoveServerRequest{
-			Id: *serverId,
+			Id:    *serverId,
+			Force: true,
 		})
 		if err != nil {
 			return fmt.Errorf("raft remove server: %v", err)