fix allocate reduplicated volumeId to different volume (#5811)

* fix allocate reduplicated volumeId to different volume

* only check barrier when read

---------

Co-authored-by: Yang Wang <yangwang@weride.ai>

weed/server/master_server.go

@@ -186,22 +186,7 @@ func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) {
 		raftServerName = fmt.Sprintf("[%s]", ms.Topo.RaftServer.Name())
 	} else if raftServer.RaftHashicorp != nil {
 		ms.Topo.HashicorpRaft = raftServer.RaftHashicorp
-		leaderCh := raftServer.RaftHashicorp.LeaderCh()
-		prevLeader, _ := ms.Topo.HashicorpRaft.LeaderWithID()
 		raftServerName = ms.Topo.HashicorpRaft.String()
-		go func() {
-			for {
-				select {
-				case isLeader := <-leaderCh:
-					ms.Topo.RaftServerAccessLock.RLock()
-					leader, _ := ms.Topo.HashicorpRaft.LeaderWithID()
-					ms.Topo.RaftServerAccessLock.RUnlock()
-					glog.V(0).Infof("is leader %+v change event: %+v => %+v", isLeader, prevLeader, leader)
-					stats.MasterLeaderChangeCounter.WithLabelValues(fmt.Sprintf("%+v", leader)).Inc()
-					prevLeader = leader
-				}
-			}
-		}()
 	}
 	ms.Topo.RaftServerAccessLock.Unlock()
 

weed/server/raft_hashicorp.go

@@ -5,6 +5,14 @@ package weed_server
 
 import (
 	"fmt"
+	"math/rand"
+	"os"
+	"path"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
 	transport "github.com/Jille/raft-grpc-transport"
 	"github.com/armon/go-metrics"
 	"github.com/armon/go-metrics/prometheus"
@@ -14,13 +22,6 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/stats"
 	"google.golang.org/grpc"
-	"math/rand"
-	"os"
-	"path"
-	"path/filepath"
-	"sort"
-	"strings"
-	"time"
 )
 
 const (
@@ -56,11 +57,32 @@ func (s *RaftServer) AddPeersConfiguration() (cfg raft.Configuration) {
 	return cfg
 }
 
-func (s *RaftServer) UpdatePeers() {
+func (s *RaftServer) monitorLeaderLoop(updatePeers bool) {
 	for {
+		prevLeader, _ := s.RaftHashicorp.LeaderWithID()
 		select {
 		case isLeader := <-s.RaftHashicorp.LeaderCh():
+			leader, _ := s.RaftHashicorp.LeaderWithID()
 			if isLeader {
+
+				if updatePeers {
+					s.updatePeers()
+					updatePeers = false
+				}
+
+				s.topo.DoBarrier()
+
+				stats.MasterLeaderChangeCounter.WithLabelValues(fmt.Sprintf("%+v", leader)).Inc()
+			} else {
+				s.topo.BarrierReset()
+			}
+			glog.V(0).Infof("is leader %+v change event: %+v => %+v", isLeader, prevLeader, leader)
+			prevLeader = leader
+		}
+	}
+}
+
+func (s *RaftServer) updatePeers() {
 	peerLeader := string(s.serverAddr)
 	existsPeerName := make(map[string]bool)
 	for _, server := range s.RaftHashicorp.GetConfiguration().Configuration().Servers {
@@ -89,12 +111,6 @@ func (s *RaftServer) UpdatePeers() {
 		s.RaftHashicorp.RemoveServer(raft.ServerID(peerLeader), 0, 0)
 	}
 }
-			return
-		case <-time.After(updatePeersTimeout):
-			return
-		}
-	}
-}
 
 func NewHashicorpRaftServer(option *RaftServerOption) (*RaftServer, error) {
 	s := &RaftServer{
@@ -157,6 +173,8 @@ func NewHashicorpRaftServer(option *RaftServerOption) (*RaftServer, error) {
 	if err != nil {
 		return nil, fmt.Errorf("raft.NewRaft: %v", err)
 	}
+
+	updatePeers := false
 	if option.RaftBootstrap || len(s.RaftHashicorp.GetConfiguration().Configuration().Servers) == 0 {
 		cfg := s.AddPeersConfiguration()
 		// Need to get lock, in case all servers do this at the same time.
@@ -169,9 +187,11 @@ func NewHashicorpRaftServer(option *RaftServerOption) (*RaftServer, error) {
 			return nil, fmt.Errorf("raft.Raft.BootstrapCluster: %v", err)
 		}
 	} else {
-		go s.UpdatePeers()
+		updatePeers = true
 	}
 
+	go s.monitorLeaderLoop(updatePeers)
+
 	ticker := time.NewTicker(c.HeartbeatTimeout * 10)
 	if glog.V(4) {
 		go func() {

weed/server/raft_server.go

@@ -2,13 +2,14 @@ package weed_server
 
 import (
 	"encoding/json"
-	transport "github.com/Jille/raft-grpc-transport"
 	"io"
 	"math/rand"
 	"os"
 	"path"
 	"time"
 
+	transport "github.com/Jille/raft-grpc-transport"
+
 	"google.golang.org/grpc"
 
 	"github.com/seaweedfs/seaweedfs/weed/pb"

weed/topology/topology.go

@@ -50,6 +50,9 @@ type Topology struct {
 	RaftServer           raft.Server
 	RaftServerAccessLock sync.RWMutex
 	HashicorpRaft        *hashicorpRaft.Raft
+	barrierLock          sync.Mutex
+	barrierDone          bool
+
 	UuidAccessLock sync.RWMutex
 	UuidMap        map[string][]string
 }
@@ -120,6 +123,42 @@ func (t *Topology) IsLeader() bool {
 	return false
 }
 
+func (t *Topology) IsLeaderAndCanRead() bool {
+	if t.RaftServer != nil {
+		return t.IsLeader()
+	} else if t.HashicorpRaft != nil {
+		return t.IsLeader() && t.DoBarrier()
+	} else {
+		return false
+	}
+}
+
+func (t *Topology) DoBarrier() bool {
+	t.barrierLock.Lock()
+	defer t.barrierLock.Unlock()
+	if t.barrierDone {
+		return true
+	}
+
+	glog.V(0).Infof("raft do barrier")
+	barrier := t.HashicorpRaft.Barrier(2 * time.Minute)
+	if err := barrier.Error(); err != nil {
+		glog.Errorf("failed to wait for barrier, error %s", err)
+		return false
+
+	}
+
+	t.barrierDone = true
+	glog.V(0).Infof("raft do barrier success")
+	return true
+}
+
+func (t *Topology) BarrierReset() {
+	t.barrierLock.Lock()
+	defer t.barrierLock.Unlock()
+	t.barrierDone = false
+}
+
 func (t *Topology) Leader() (l pb.ServerAddress, err error) {
 	exponentialBackoff := backoff.NewExponentialBackOff()
 	exponentialBackoff.InitialInterval = 100 * time.Millisecond
@@ -180,6 +219,10 @@ func (t *Topology) Lookup(collection string, vid needle.VolumeId) (dataNodes []*
 }
 
 func (t *Topology) NextVolumeId() (needle.VolumeId, error) {
+	if !t.IsLeaderAndCanRead() {
+		return 0, fmt.Errorf("as leader can not read yet")
+
+	}
 	vid := t.GetMaxVolumeId()
 	next := vid.Next()