Merge pull request #2701 from yichengq/rafthttp-anon

rafthttp: add remotes

etcdmain/etcd.go

@@ -191,7 +191,7 @@ func startEtcd(cfg *config) (<-chan struct{}, error) {
 		Handler: etcdhttp.NewClientHandler(s),
 		Info:    cfg.corsInfo,
 	}
-	ph := etcdhttp.NewPeerHandler(s.Cluster, etcdserver.RaftTimer(s), s.RaftHandler())
+	ph := etcdhttp.NewPeerHandler(s.Cluster, s.RaftHandler())
 	// Start the peer server in a goroutine
 	for _, l := range plns {
 		go func(l net.Listener) {

etcdserver/cluster.go

@@ -30,7 +30,6 @@ import (
 	"github.com/coreos/etcd/pkg/netutil"
 	"github.com/coreos/etcd/pkg/types"
 	"github.com/coreos/etcd/raft/raftpb"
-	"github.com/coreos/etcd/rafthttp"
 	"github.com/coreos/etcd/store"
 )
 
@@ -60,18 +59,7 @@ type Cluster struct {
 	id    types.ID
 	token string
 	store store.Store
-	// index is the raft index that cluster is updated at bootstrap
-	// from remote cluster info.
-	// It may have a higher value than local raft index, because it
-	// displays a further view of the cluster.
-	// TODO: upgrade it as last modified index
-	index uint64
-
-	// transport and members maintains the view of the cluster at index.
-	// This might be more up to date than what stores in the store since
-	// the index may be higher than store index, which may happen when the
-	// cluster is updated from remote cluster info.
-	transport  rafthttp.Transporter
+
 	sync.Mutex // guards members and removed map
 	members    map[types.ID]*Member
 	// removed contains the ids of removed members in the cluster.
@@ -242,23 +230,8 @@ func (c *Cluster) SetID(id types.ID) { c.id = id }
 
 func (c *Cluster) SetStore(st store.Store) { c.store = st }
 
-func (c *Cluster) UpdateIndex(index uint64) { c.index = index }
-
 func (c *Cluster) Recover() {
 	c.members, c.removed = membersFromStore(c.store)
-	// recover transport
-	c.transport.RemoveAllPeers()
-	for _, m := range c.Members() {
-		c.transport.AddPeer(m.ID, m.PeerURLs)
-	}
-}
-
-func (c *Cluster) SetTransport(tr rafthttp.Transporter) {
-	c.transport = tr
-	// add all the remote members into transport
-	for _, m := range c.Members() {
-		c.transport.AddPeer(m.ID, m.PeerURLs)
-	}
 }
 
 // ValidateConfigurationChange takes a proposed ConfChange and
@@ -324,8 +297,7 @@ func (c *Cluster) ValidateConfigurationChange(cc raftpb.ConfChange) error {
 // AddMember adds a new Member into the cluster, and saves the given member's
 // raftAttributes into the store. The given member should have empty attributes.
 // A Member with a matching id must not exist.
-// The given index indicates when the event happens.
-func (c *Cluster) AddMember(m *Member, index uint64) {
+func (c *Cluster) AddMember(m *Member) {
 	c.Lock()
 	defer c.Unlock()
 	b, err := json.Marshal(m.RaftAttributes)
@@ -336,37 +308,22 @@ func (c *Cluster) AddMember(m *Member, index uint64) {
 	if _, err := c.store.Create(p, false, string(b), false, store.Permanent); err != nil {
 		log.Panicf("create raftAttributes should never fail: %v", err)
 	}
-	if index > c.index {
-		// TODO: check member does not exist in the cluster
-		// New bootstrapped member has initial cluster, which contains unadded
-		// peers.
-		c.members[m.ID] = m
-		c.transport.AddPeer(m.ID, m.PeerURLs)
-		c.index = index
-	}
+	c.members[m.ID] = m
 }
 
 // RemoveMember removes a member from the store.
 // The given id MUST exist, or the function panics.
-// The given index indicates when the event happens.
-func (c *Cluster) RemoveMember(id types.ID, index uint64) {
+func (c *Cluster) RemoveMember(id types.ID) {
 	c.Lock()
 	defer c.Unlock()
 	if _, err := c.store.Delete(memberStoreKey(id), true, true); err != nil {
 		log.Panicf("delete member should never fail: %v", err)
 	}
+	delete(c.members, id)
 	if _, err := c.store.Create(removedMemberStoreKey(id), false, "", false, store.Permanent); err != nil {
 		log.Panicf("create removedMember should never fail: %v", err)
 	}
-	if index > c.index {
-		if _, ok := c.members[id]; !ok {
-			log.Panicf("member %s should exist in the cluster", id)
-		}
-		delete(c.members, id)
-		c.removed[id] = true
-		c.transport.RemovePeer(id)
-		c.index = index
-	}
+	c.removed[id] = true
 }
 
 func (c *Cluster) UpdateAttributes(id types.ID, attr Attributes) {
@@ -376,9 +333,7 @@ func (c *Cluster) UpdateAttributes(id types.ID, attr Attributes) {
 	// TODO: update store in this function
 }
 
-// UpdateRaftAttributes updates the raft attributes of the given id.
-// The given index indicates when the event happens.
-func (c *Cluster) UpdateRaftAttributes(id types.ID, raftAttr RaftAttributes, index uint64) {
+func (c *Cluster) UpdateRaftAttributes(id types.ID, raftAttr RaftAttributes) {
 	c.Lock()
 	defer c.Unlock()
 	b, err := json.Marshal(raftAttr)
@@ -389,11 +344,7 @@ func (c *Cluster) UpdateRaftAttributes(id types.ID, raftAttr RaftAttributes, ind
 	if _, err := c.store.Update(p, string(b), store.Permanent); err != nil {
 		log.Panicf("update raftAttributes should never fail: %v", err)
 	}
-	if index > c.index {
-		c.members[id].RaftAttributes = raftAttr
-		c.transport.UpdatePeer(id, raftAttr.PeerURLs)
-		c.index = index
-	}
+	c.members[id].RaftAttributes = raftAttr
 }
 
 // Validate ensures that there is no identical urls in the cluster peer list

etcdserver/cluster_test.go

@@ -96,9 +96,8 @@ func TestClusterFromStore(t *testing.T) {
 	for i, tt := range tests {
 		hc := newTestCluster(nil)
 		hc.SetStore(store.New())
-		hc.SetTransport(&nopTransporter{})
-		for j, m := range tt.mems {
-			hc.AddMember(m, uint64(j))
+		for _, m := range tt.mems {
+			hc.AddMember(m)
 		}
 		c := NewClusterFromStore("abc", hc.store)
 		if c.token != "abc" {
@@ -358,12 +357,11 @@ func TestClusterValidateAndAssignIDs(t *testing.T) {
 func TestClusterValidateConfigurationChange(t *testing.T) {
 	cl := newCluster("")
 	cl.SetStore(store.New())
-	cl.SetTransport(&nopTransporter{})
 	for i := 1; i <= 4; i++ {
 		attr := RaftAttributes{PeerURLs: []string{fmt.Sprintf("http://127.0.0.1:%d", i)}}
-		cl.AddMember(&Member{ID: types.ID(i), RaftAttributes: attr}, uint64(i))
+		cl.AddMember(&Member{ID: types.ID(i), RaftAttributes: attr})
 	}
-	cl.RemoveMember(4, 5)
+	cl.RemoveMember(4)
 
 	attr := RaftAttributes{PeerURLs: []string{fmt.Sprintf("http://127.0.0.1:%d", 1)}}
 	ctx, err := json.Marshal(&Member{ID: types.ID(5), RaftAttributes: attr})
@@ -491,8 +489,7 @@ func TestClusterGenID(t *testing.T) {
 	previd := cs.ID()
 
 	cs.SetStore(&storeRecorder{})
-	cs.SetTransport(&nopTransporter{})
-	cs.AddMember(newTestMember(3, nil, "", nil), 1)
+	cs.AddMember(newTestMember(3, nil, "", nil))
 	cs.genID()
 	if cs.ID() == previd {
 		t.Fatalf("cluster.ID = %v, want not %v", cs.ID(), previd)
@@ -535,8 +532,7 @@ func TestClusterAddMember(t *testing.T) {
 	st := &storeRecorder{}
 	c := newTestCluster(nil)
 	c.SetStore(st)
-	c.SetTransport(&nopTransporter{})
-	c.AddMember(newTestMember(1, nil, "node1", nil), 1)
+	c.AddMember(newTestMember(1, nil, "node1", nil))
 
 	wactions := []testutil.Action{
 		{
@@ -621,14 +617,10 @@ func TestClusterString(t *testing.T) {
 }
 
 func TestClusterRemoveMember(t *testing.T) {
-	c := newTestCluster(nil)
-	c.SetStore(&storeRecorder{})
-	c.SetTransport(&nopTransporter{})
-	c.AddMember(newTestMember(1, nil, "", nil), 1)
-
 	st := &storeRecorder{}
+	c := newTestCluster(nil)
 	c.SetStore(st)
-	c.RemoveMember(1, 2)
+	c.RemoveMember(1)
 
 	wactions := []testutil.Action{
 		{Name: "Delete", Params: []interface{}{memberStoreKey(1), true, true}},

etcdserver/cluster_util.go

@@ -21,7 +21,6 @@ import (
 	"log"
 	"net/http"
 	"sort"
-	"strconv"
 	"time"
 
 	"github.com/coreos/etcd/pkg/types"
@@ -89,21 +88,7 @@ func getClusterFromRemotePeers(urls []string, logerr bool, tr *http.Transport) (
 			}
 			continue
 		}
-		var index uint64
-		// The header at or before v2.0.3 doesn't have this field. For backward
-		// compatibility, it checks whether the field exists.
-		if indexStr := resp.Header.Get("X-Raft-Index"); indexStr != "" {
-			index, err = strconv.ParseUint(indexStr, 10, 64)
-			if err != nil {
-				if logerr {
-					log.Printf("etcdserver: could not parse raft index: %v", err)
-				}
-				continue
-			}
-		}
-		cl := NewClusterFromMembers("", id, membs)
-		cl.UpdateIndex(index)
-		return cl, nil
+		return NewClusterFromMembers("", id, membs), nil
 	}
 	return nil, fmt.Errorf("etcdserver: could not retrieve cluster information from the given urls")
 }

etcdserver/etcdhttp/peer.go

@@ -18,7 +18,6 @@ import (
 	"encoding/json"
 	"log"
 	"net/http"
-	"strconv"
 
 	"github.com/coreos/etcd/etcdserver"
 	"github.com/coreos/etcd/rafthttp"
@@ -29,10 +28,9 @@ const (
 )
 
 // NewPeerHandler generates an http.Handler to handle etcd peer (raft) requests.
-func NewPeerHandler(clusterInfo etcdserver.ClusterInfo, timer etcdserver.RaftTimer, raftHandler http.Handler) http.Handler {
+func NewPeerHandler(clusterInfo etcdserver.ClusterInfo, raftHandler http.Handler) http.Handler {
 	mh := &peerMembersHandler{
 		clusterInfo: clusterInfo,
-		timer:       timer,
 	}
 
 	mux := http.NewServeMux()
@@ -46,7 +44,6 @@ func NewPeerHandler(clusterInfo etcdserver.ClusterInfo, timer etcdserver.RaftTim
 
 type peerMembersHandler struct {
 	clusterInfo etcdserver.ClusterInfo
-	timer       etcdserver.RaftTimer
 }
 
 func (h *peerMembersHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -54,7 +51,6 @@ func (h *peerMembersHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	w.Header().Set("X-Etcd-Cluster-ID", h.clusterInfo.ID().String())
-	w.Header().Set("X-Raft-Index", strconv.FormatUint(h.timer.Index(), 10))
 
 	if r.URL.Path != peerMembersPrefix {
 		http.Error(w, "bad path", http.StatusBadRequest)

etcdserver/etcdhttp/peer_test.go

@@ -33,7 +33,7 @@ func TestNewPeerHandlerOnRaftPrefix(t *testing.T) {
 	h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte("test data"))
 	})
-	ph := NewPeerHandler(&fakeCluster{}, &dummyRaftTimer{}, h)
+	ph := NewPeerHandler(&fakeCluster{}, h)
 	srv := httptest.NewServer(ph)
 	defer srv.Close()
 
@@ -91,7 +91,7 @@ func TestServeMembersGet(t *testing.T) {
 		id:      1,
 		members: map[uint64]*etcdserver.Member{1: &memb1, 2: &memb2},
 	}
-	h := &peerMembersHandler{clusterInfo: cluster, timer: &dummyRaftTimer{}}
+	h := &peerMembersHandler{clusterInfo: cluster}
 	msb, err := json.Marshal([]etcdserver.Member{memb1, memb2})
 	if err != nil {
 		t.Fatal(err)

etcdserver/server.go

@@ -168,6 +168,7 @@ func NewServer(cfg *ServerConfig) (*EtcdServer, error) {
 	haveWAL := wal.Exist(cfg.WALDir())
 	ss := snap.New(cfg.SnapDir())
 
+	var remotes []*Member
 	switch {
 	case !haveWAL && !cfg.NewCluster:
 		if err := cfg.VerifyJoinExisting(); err != nil {
@@ -180,7 +181,7 @@ func NewServer(cfg *ServerConfig) (*EtcdServer, error) {
 		if err := ValidateClusterAndAssignIDs(cfg.Cluster, existingCluster); err != nil {
 			return nil, fmt.Errorf("error validating peerURLs %s: %v", existingCluster, err)
 		}
-		cfg.Cluster.UpdateIndex(existingCluster.index)
+		remotes = existingCluster.Members()
 		cfg.Cluster.SetID(existingCluster.id)
 		cfg.Cluster.SetStore(st)
 		cfg.Print()
@@ -271,9 +272,20 @@ func NewServer(cfg *ServerConfig) (*EtcdServer, error) {
 		reqIDGen:   idutil.NewGenerator(uint8(id), time.Now()),
 	}
 
+	// TODO: move transport initialization near the definition of remote
 	tr := rafthttp.NewTransporter(cfg.Transport, id, cfg.Cluster.ID(), srv, srv.errorc, sstats, lstats)
+	// add all remotes into transport
+	for _, m := range remotes {
+		if m.ID != id {
+			tr.AddRemote(m.ID, m.PeerURLs)
+		}
+	}
+	for _, m := range cfg.Cluster.Members() {
+		if m.ID != id {
+			tr.AddPeer(m.ID, m.PeerURLs)
+		}
+	}
 	srv.r.transport = tr
-	srv.Cluster.SetTransport(tr)
 	return srv, nil
 }
 
@@ -374,11 +386,15 @@ func (s *EtcdServer) run() {
 				if err := s.store.Recovery(apply.snapshot.Data); err != nil {
 					log.Panicf("recovery store error: %v", err)
 				}
-
-				// Avoid snapshot recovery overwriting newer cluster and
-				// transport setting, which may block the communication.
-				if s.Cluster.index < apply.snapshot.Metadata.Index {
-					s.Cluster.Recover()
+				s.Cluster.Recover()
+
+				// recover raft transport
+				s.r.transport.RemoveAllPeers()
+				for _, m := range s.Cluster.Members() {
+					if m.ID == s.ID() {
+						continue
+					}
+					s.r.transport.AddPeer(m.ID, m.PeerURLs)
 				}
 
 				appliedi = apply.snapshot.Metadata.Index
@@ -680,7 +696,7 @@ func (s *EtcdServer) apply(es []raftpb.Entry, confState *raftpb.ConfState) (uint
 		case raftpb.EntryConfChange:
 			var cc raftpb.ConfChange
 			pbutil.MustUnmarshal(&cc, e.Data)
-			shouldstop, err = s.applyConfChange(cc, confState, e.Index)
+			shouldstop, err = s.applyConfChange(cc, confState)
 			s.w.Trigger(cc.ID, err)
 		default:
 			log.Panicf("entry type should be either EntryNormal or EntryConfChange")
@@ -745,9 +761,9 @@ func (s *EtcdServer) applyRequest(r pb.Request) Response {
 	}
 }
 
-// applyConfChange applies a ConfChange to the server at the given index. It is only
-// invoked with a ConfChange that has already passed through Raft.
-func (s *EtcdServer) applyConfChange(cc raftpb.ConfChange, confState *raftpb.ConfState, index uint64) (bool, error) {
+// applyConfChange applies a ConfChange to the server. It is only
+// invoked with a ConfChange that has already passed through Raft
+func (s *EtcdServer) applyConfChange(cc raftpb.ConfChange, confState *raftpb.ConfState) (bool, error) {
 	if err := s.Cluster.ValidateConfigurationChange(cc); err != nil {
 		cc.NodeID = raft.None
 		s.r.ApplyConfChange(cc)
@@ -763,18 +779,20 @@ func (s *EtcdServer) applyConfChange(cc raftpb.ConfChange, confState *raftpb.Con
 		if cc.NodeID != uint64(m.ID) {
 			log.Panicf("nodeID should always be equal to member ID")
 		}
-		s.Cluster.AddMember(m, index)
+		s.Cluster.AddMember(m)
 		if m.ID == s.id {
 			log.Printf("etcdserver: added local member %s %v to cluster %s", m.ID, m.PeerURLs, s.Cluster.ID())
 		} else {
+			s.r.transport.AddPeer(m.ID, m.PeerURLs)
 			log.Printf("etcdserver: added member %s %v to cluster %s", m.ID, m.PeerURLs, s.Cluster.ID())
 		}
 	case raftpb.ConfChangeRemoveNode:
 		id := types.ID(cc.NodeID)
-		s.Cluster.RemoveMember(id, index)
+		s.Cluster.RemoveMember(id)
 		if id == s.id {
 			return true, nil
 		} else {
+			s.r.transport.RemovePeer(id)
 			log.Printf("etcdserver: removed member %s from cluster %s", id, s.Cluster.ID())
 		}
 	case raftpb.ConfChangeUpdateNode:
@@ -785,10 +803,11 @@ func (s *EtcdServer) applyConfChange(cc raftpb.ConfChange, confState *raftpb.Con
 		if cc.NodeID != uint64(m.ID) {
 			log.Panicf("nodeID should always be equal to member ID")
 		}
-		s.Cluster.UpdateRaftAttributes(m.ID, m.RaftAttributes, index)
+		s.Cluster.UpdateRaftAttributes(m.ID, m.RaftAttributes)
 		if m.ID == s.id {
 			log.Printf("etcdserver: update local member %s %v in cluster %s", m.ID, m.PeerURLs, s.Cluster.ID())
 		} else {
+			s.r.transport.UpdatePeer(m.ID, m.PeerURLs)
 			log.Printf("etcdserver: update member %s %v in cluster %s", m.ID, m.PeerURLs, s.Cluster.ID())
 		}
 	}

etcdserver/server_test.go

@@ -411,11 +411,10 @@ func TestApplyRequestOnAdminMemberAttributes(t *testing.T) {
 func TestApplyConfChangeError(t *testing.T) {
 	cl := newCluster("")
 	cl.SetStore(store.New())
-	cl.SetTransport(&nopTransporter{})
 	for i := 1; i <= 4; i++ {
-		cl.AddMember(&Member{ID: types.ID(i)}, uint64(i))
+		cl.AddMember(&Member{ID: types.ID(i)})
 	}
-	cl.RemoveMember(4, 5)
+	cl.RemoveMember(4)
 
 	tests := []struct {
 		cc   raftpb.ConfChange
@@ -456,7 +455,7 @@ func TestApplyConfChangeError(t *testing.T) {
 			r:       raftNode{Node: n},
 			Cluster: cl,
 		}
-		_, err := srv.applyConfChange(tt.cc, nil, 10)
+		_, err := srv.applyConfChange(tt.cc, nil)
 		if err != tt.werr {
 			t.Errorf("#%d: applyConfChange error = %v, want %v", i, err, tt.werr)
 		}
@@ -476,9 +475,8 @@ func TestApplyConfChangeError(t *testing.T) {
 func TestApplyConfChangeShouldStop(t *testing.T) {
 	cl := newCluster("")
 	cl.SetStore(store.New())
-	cl.SetTransport(&nopTransporter{})
 	for i := 1; i <= 3; i++ {
-		cl.AddMember(&Member{ID: types.ID(i)}, uint64(i))
+		cl.AddMember(&Member{ID: types.ID(i)})
 	}
 	srv := &EtcdServer{
 		id: 1,
@@ -493,7 +491,7 @@ func TestApplyConfChangeShouldStop(t *testing.T) {
 		NodeID: 2,
 	}
 	// remove non-local member
-	shouldStop, err := srv.applyConfChange(cc, &raftpb.ConfState{}, 10)
+	shouldStop, err := srv.applyConfChange(cc, &raftpb.ConfState{})
 	if err != nil {
 		t.Fatalf("unexpected error %v", err)
 	}
@@ -503,7 +501,7 @@ func TestApplyConfChangeShouldStop(t *testing.T) {
 
 	// remove local member
 	cc.NodeID = 1
-	shouldStop, err = srv.applyConfChange(cc, &raftpb.ConfState{}, 10)
+	shouldStop, err = srv.applyConfChange(cc, &raftpb.ConfState{})
 	if err != nil {
 		t.Fatalf("unexpected error %v", err)
 	}
@@ -774,7 +772,6 @@ func TestRecvSnapshot(t *testing.T) {
 	p := &storageRecorder{}
 	cl := newCluster("abc")
 	cl.SetStore(store.New())
-	cl.SetTransport(&nopTransporter{})
 	s := &EtcdServer{
 		r: raftNode{
 			Node:        n,
@@ -809,7 +806,6 @@ func TestApplySnapshotAndCommittedEntries(t *testing.T) {
 	st := &storeRecorder{}
 	cl := newCluster("abc")
 	cl.SetStore(store.New())
-	cl.SetTransport(&nopTransporter{})
 	storage := raft.NewMemoryStorage()
 	s := &EtcdServer{
 		r: raftNode{
@@ -855,7 +851,6 @@ func TestAddMember(t *testing.T) {
 	cl := newTestCluster(nil)
 	st := store.New()
 	cl.SetStore(st)
-	cl.SetTransport(&nopTransporter{})
 	s := &EtcdServer{
 		r: raftNode{
 			Node:        n,
@@ -894,7 +889,7 @@ func TestRemoveMember(t *testing.T) {
 	cl := newTestCluster(nil)
 	st := store.New()
 	cl.SetStore(store.New())
-	cl.SetTransport(&nopTransporter{})
+	cl.AddMember(&Member{ID: 1234})
 	s := &EtcdServer{
 		r: raftNode{
 			Node:        n,
@@ -907,7 +902,6 @@ func TestRemoveMember(t *testing.T) {
 		reqIDGen: idutil.NewGenerator(0, time.Time{}),
 	}
 	s.start()
-	s.AddMember(context.TODO(), Member{ID: 1234})
 	err := s.RemoveMember(context.TODO(), 1234)
 	gaction := n.Action()
 	s.Stop()
@@ -915,12 +909,7 @@ func TestRemoveMember(t *testing.T) {
 	if err != nil {
 		t.Fatalf("RemoveMember error: %v", err)
 	}
-	wactions := []testutil.Action{
-		{Name: "ProposeConfChange:ConfChangeAddNode"},
-		{Name: "ApplyConfChange:ConfChangeAddNode"},
-		{Name: "ProposeConfChange:ConfChangeRemoveNode"},
-		{Name: "ApplyConfChange:ConfChangeRemoveNode"},
-	}
+	wactions := []testutil.Action{{Name: "ProposeConfChange:ConfChangeRemoveNode"}, {Name: "ApplyConfChange:ConfChangeRemoveNode"}}
 	if !reflect.DeepEqual(gaction, wactions) {
 		t.Errorf("action = %v, want %v", gaction, wactions)
 	}
@@ -938,7 +927,7 @@ func TestUpdateMember(t *testing.T) {
 	cl := newTestCluster(nil)
 	st := store.New()
 	cl.SetStore(st)
-	cl.SetTransport(&nopTransporter{})
+	cl.AddMember(&Member{ID: 1234})
 	s := &EtcdServer{
 		r: raftNode{
 			Node:        n,
@@ -951,7 +940,6 @@ func TestUpdateMember(t *testing.T) {
 		reqIDGen: idutil.NewGenerator(0, time.Time{}),
 	}
 	s.start()
-	s.AddMember(context.TODO(), Member{ID: 1234})
 	wm := Member{ID: 1234, RaftAttributes: RaftAttributes{PeerURLs: []string{"http://127.0.0.1:1"}}}
 	err := s.UpdateMember(context.TODO(), wm)
 	gaction := n.Action()
@@ -960,12 +948,7 @@ func TestUpdateMember(t *testing.T) {
 	if err != nil {
 		t.Fatalf("UpdateMember error: %v", err)
 	}
-	wactions := []testutil.Action{
-		{Name: "ProposeConfChange:ConfChangeAddNode"},
-		{Name: "ApplyConfChange:ConfChangeAddNode"},
-		{Name: "ProposeConfChange:ConfChangeUpdateNode"},
-		{Name: "ApplyConfChange:ConfChangeUpdateNode"},
-	}
+	wactions := []testutil.Action{{Name: "ProposeConfChange:ConfChangeUpdateNode"}, {Name: "ApplyConfChange:ConfChangeUpdateNode"}}
 	if !reflect.DeepEqual(gaction, wactions) {
 		t.Errorf("action = %v, want %v", gaction, wactions)
 	}
@@ -1383,6 +1366,7 @@ type nopTransporter struct{}
 
 func (s *nopTransporter) Handler() http.Handler               { return nil }
 func (s *nopTransporter) Send(m []raftpb.Message)             {}
+func (s *nopTransporter) AddRemote(id types.ID, us []string)  {}
 func (s *nopTransporter) AddPeer(id types.ID, us []string)    {}
 func (s *nopTransporter) RemovePeer(id types.ID)              {}
 func (s *nopTransporter) RemoveAllPeers()                     {}

integration/cluster_test.go

@@ -625,7 +625,7 @@ func (m *member) Launch() error {
 	m.s.SyncTicker = time.Tick(500 * time.Millisecond)
 	m.s.Start()
 
-	m.raftHandler = &testutil.PauseableHandler{Next: etcdhttp.NewPeerHandler(m.s.Cluster, m.s, m.s.RaftHandler())}
+	m.raftHandler = &testutil.PauseableHandler{Next: etcdhttp.NewPeerHandler(m.s.Cluster, m.s.RaftHandler())}
 
 	for _, ln := range m.PeerListeners {
 		hs := &httptest.Server{

rafthttp/pipeline.go

@@ -101,7 +101,7 @@ func (p *pipeline) handle() {
 				log.Printf("pipeline: the connection with %s became inactive", p.id)
 				p.active = false
 			}
-			if m.Type == raftpb.MsgApp {
+			if m.Type == raftpb.MsgApp && p.fs != nil {
 				p.fs.Fail()
 			}
 			p.r.ReportUnreachable(m.To)
@@ -114,7 +114,7 @@ func (p *pipeline) handle() {
 				p.active = true
 				p.errored = nil
 			}
-			if m.Type == raftpb.MsgApp {
+			if m.Type == raftpb.MsgApp && p.fs != nil {
 				p.fs.Succ(end.Sub(start))
 			}
 			if isMsgSnap(m) {

rafthttp/remote.go

@@ -0,0 +1,48 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rafthttp
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/coreos/etcd/pkg/types"
+	"github.com/coreos/etcd/raft/raftpb"
+)
+
+type remote struct {
+	id       types.ID
+	pipeline *pipeline
+}
+
+func startRemote(tr http.RoundTripper, urls types.URLs, local, to, cid types.ID, r Raft, errorc chan error) *remote {
+	picker := newURLPicker(urls)
+	return &remote{
+		id:       to,
+		pipeline: newPipeline(tr, picker, to, cid, nil, r, errorc),
+	}
+}
+
+func (g *remote) Send(m raftpb.Message) {
+	select {
+	case g.pipeline.msgc <- m:
+	default:
+		log.Printf("remote: dropping %s to %s since pipeline with %d-size buffer is blocked", m.Type, g.id, pipelineBufSize)
+	}
+}
+
+func (g *remote) Stop() {
+	g.pipeline.stop()
+}

rafthttp/transport.go

@@ -45,6 +45,12 @@ type Transporter interface {
 	// If the id cannot be found in the transport, the message
 	// will be ignored.
 	Send(m []raftpb.Message)
+	// AddRemote adds a remote with given peer urls into the transport.
+	// A remote helps newly joined member to catch up the progress of cluster,
+	// and will not be used after that.
+	// It is the caller's responsibility to ensure the urls are all vaild,
+	// or it panics.
+	AddRemote(id types.ID, urls []string)
 	// AddPeer adds a peer with given peer urls into the transport.
 	// It is the caller's responsibility to ensure the urls are all vaild,
 	// or it panics.
@@ -70,9 +76,10 @@ type transport struct {
 	serverStats  *stats.ServerStats
 	leaderStats  *stats.LeaderStats
 
-	mu     sync.RWMutex      // protect the peer map
-	peers  map[types.ID]Peer // remote peers
-	errorc chan error
+	mu      sync.RWMutex         // protect the remote and peer map
+	remotes map[types.ID]*remote // remotes map that helps newly joined member to catch up
+	peers   map[types.ID]Peer    // peers map
+	errorc  chan error
 }
 
 func NewTransporter(rt http.RoundTripper, id, cid types.ID, r Raft, errorc chan error, ss *stats.ServerStats, ls *stats.LeaderStats) Transporter {
@@ -83,6 +90,7 @@ func NewTransporter(rt http.RoundTripper, id, cid types.ID, r Raft, errorc chan
 		raft:         r,
 		serverStats:  ss,
 		leaderStats:  ls,
+		remotes:      make(map[types.ID]*remote),
 		peers:        make(map[types.ID]Peer),
 		errorc:       errorc,
 	}
@@ -110,21 +118,30 @@ func (t *transport) Send(msgs []raftpb.Message) {
 			continue
 		}
 		to := types.ID(m.To)
+
 		p, ok := t.peers[to]
-		if !ok {
-			log.Printf("etcdserver: send message to unknown receiver %s", to)
+		if ok {
+			if m.Type == raftpb.MsgApp {
+				t.serverStats.SendAppendReq(m.Size())
+			}
+			p.Send(m)
 			continue
 		}
 
-		if m.Type == raftpb.MsgApp {
-			t.serverStats.SendAppendReq(m.Size())
+		g, ok := t.remotes[to]
+		if ok {
+			g.Send(m)
+			continue
 		}
 
-		p.Send(m)
+		log.Printf("etcdserver: send message to unknown receiver %s", to)
 	}
 }
 
 func (t *transport) Stop() {
+	for _, r := range t.remotes {
+		r.Stop()
+	}
 	for _, p := range t.peers {
 		p.Stop()
 	}
@@ -133,14 +150,22 @@ func (t *transport) Stop() {
 	}
 }
 
-func (t *transport) AddPeer(id types.ID, us []string) {
+func (t *transport) AddRemote(id types.ID, us []string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	// There is no need to build connection to itself because local message
-	// is not sent through transport.
-	if id == t.id {
+	if _, ok := t.remotes[id]; ok {
 		return
 	}
+	urls, err := types.NewURLs(us)
+	if err != nil {
+		log.Panicf("newURLs %+v should never fail: %+v", us, err)
+	}
+	t.remotes[id] = startRemote(t.roundTripper, urls, t.id, id, t.clusterID, t.raft, t.errorc)
+}
+
+func (t *transport) AddPeer(id types.ID, us []string) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
 	if _, ok := t.peers[id]; ok {
 		return
 	}
@@ -155,9 +180,6 @@ func (t *transport) AddPeer(id types.ID, us []string) {
 func (t *transport) RemovePeer(id types.ID) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	if id == t.id {
-		return
-	}
 	t.removePeer(id)
 }
 
@@ -183,9 +205,6 @@ func (t *transport) removePeer(id types.ID) {
 func (t *transport) UpdatePeer(id types.ID, us []string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	if id == t.id {
-		return
-	}
 	// TODO: return error or just panic?
 	if _, ok := t.peers[id]; !ok {
 		return