From 1cc45b22a2edf49cab4b2bdf9d9e957c1d6f2e2c Mon Sep 17 00:00:00 2001
From: Travis Turner <travis@pilosa.com>
Date: Mon, 5 Mar 2018 12:14:10 -0600
Subject: [PATCH 1/3] Change Config.Coordinator from URI to bool

---
 cluster.go               |  30 ++++--
 cluster_internal_test.go |  16 +--
 cluster_test.go          |   8 +-
 config.go                |   4 +-
 ctl/server.go            |   2 +-
 handler_test.go          |   4 +-
 internal/private.pb.go   | 210 +++++++++++++++++++++++----------------
 internal/private.proto   |   1 +
 server.go                |  11 +-
 server/cluster_test.go   |  56 +++++------
 server/server.go         |  27 ++---
 test/cluster.go          |   4 +-
 test/pilosa.go           |  25 +++--
 13 files changed, 218 insertions(+), 180 deletions(-)

diff --git a/cluster.go b/cluster.go
index ee0912b09..8cdd1e922 100644
--- a/cluster.go
+++ b/cluster.go
@@ -66,8 +66,9 @@ const (
 
 // Node represents a node in the cluster.
 type Node struct {
-	ID  string `json:"id"`
-	URI URI    `json:"uri"`
+	ID            string `json:"id"`
+	URI           URI    `json:"uri"`
+	IsCoordinator bool   `json:"isCoordinator"`
 }
 
 func (n Node) String() string {
@@ -86,8 +87,9 @@ func EncodeNodes(a []*Node) []*internal.Node {
 // EncodeNode converts a Node into its internal representation.
 func EncodeNode(n *Node) *internal.Node {
 	return &internal.Node{
-		ID:  n.ID,
-		URI: n.URI.Encode(),
+		ID:            n.ID,
+		URI:           n.URI.Encode(),
+		IsCoordinator: n.IsCoordinator,
 	}
 }
 
@@ -106,8 +108,9 @@ func DecodeNodes(a []*internal.Node) []*Node {
 // DecodeNode converts a proto message into a Node.
 func DecodeNode(node *internal.Node) *Node {
 	return &Node{
-		ID:  node.ID,
-		URI: decodeURI(node.URI),
+		ID:            node.ID,
+		URI:           decodeURI(node.URI),
+		IsCoordinator: node.IsCoordinator,
 	}
 }
 
@@ -238,7 +241,7 @@ type Cluster struct {
 	// Required for cluster Resize.
 	Static      bool // Static is primarily used for testing in a non-gossip environment.
 	state       string
-	Coordinator URI
+	Coordinator string
 	Holder      *Holder
 	Broadcaster Broadcaster
 
@@ -291,12 +294,12 @@ func (c *Cluster) logger() *log.Logger {
 
 // Coordinator returns the coordinator node.
 func (c *Cluster) CoordinatorNode() *Node {
-	return c.nodeByURI(c.Coordinator)
+	return c.nodeByID(c.Coordinator)
 }
 
 // IsCoordinator is true if this node is the coordinator.
 func (c *Cluster) IsCoordinator() bool {
-	return c.Static || c.Coordinator == c.Node.URI
+	return c.Coordinator == c.Node.ID
 }
 
 // SetCoordinator updates the Coordinator to n.
@@ -308,8 +311,8 @@ func (c *Cluster) SetCoordinator(n *Node) bool {
 		return false
 	}
 
-	if c.Coordinator != newNode.URI {
-		c.Coordinator = newNode.URI
+	if c.Coordinator != newNode.ID {
+		c.Coordinator = newNode.ID
 		return true
 	}
 	return false
@@ -320,6 +323,11 @@ func (c *Cluster) SetCoordinator(n *Node) bool {
 func (c *Cluster) AddNode(node *Node) error {
 	c.logger().Printf("add node %s to cluster on %s", node, c.Node)
 
+	// If the node being added is the coordinator, set it for this node.
+	if node.IsCoordinator {
+		c.Coordinator = node.ID
+	}
+
 	// add to cluster
 	if !c.addNodeBasicSorted(node) {
 		return nil
diff --git a/cluster_internal_test.go b/cluster_internal_test.go
index 6c2c98e40..da9989760 100644
--- a/cluster_internal_test.go
+++ b/cluster_internal_test.go
@@ -180,8 +180,8 @@ func TestFragSources(t *testing.T) {
 				"node0": []*internal.ResizeSource{},
 				"node1": []*internal.ResizeSource{},
 				"node2": []*internal.ResizeSource{
-					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}}, "i", "f", "standard", uint64(0)},
-					{&internal.Node{"node1", &internal.URI{"http", "host1", 10101}}, "i", "f", "standard", uint64(2)},
+					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}, false}, "i", "f", "standard", uint64(0)},
+					{&internal.Node{"node1", &internal.URI{"http", "host1", 10101}, false}, "i", "f", "standard", uint64(2)},
 				},
 			},
 			err: "",
@@ -192,11 +192,11 @@ func TestFragSources(t *testing.T) {
 			idx:  idx,
 			expected: map[string][]*internal.ResizeSource{
 				"node0": []*internal.ResizeSource{
-					{&internal.Node{"node1", &internal.URI{"http", "host1", 10101}}, "i", "f", "standard", uint64(1)},
+					{&internal.Node{"node1", &internal.URI{"http", "host1", 10101}, false}, "i", "f", "standard", uint64(1)},
 				},
 				"node1": []*internal.ResizeSource{
-					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}}, "i", "f", "standard", uint64(0)},
-					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}}, "i", "f", "standard", uint64(2)},
+					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}, false}, "i", "f", "standard", uint64(0)},
+					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}, false}, "i", "f", "standard", uint64(2)},
 				},
 			},
 			err: "",
@@ -207,11 +207,11 @@ func TestFragSources(t *testing.T) {
 			idx:  idx,
 			expected: map[string][]*internal.ResizeSource{
 				"node0": []*internal.ResizeSource{
-					{&internal.Node{"node2", &internal.URI{"http", "host2", 10101}}, "i", "f", "standard", uint64(0)},
-					{&internal.Node{"node2", &internal.URI{"http", "host2", 10101}}, "i", "f", "standard", uint64(2)},
+					{&internal.Node{"node2", &internal.URI{"http", "host2", 10101}, false}, "i", "f", "standard", uint64(0)},
+					{&internal.Node{"node2", &internal.URI{"http", "host2", 10101}, false}, "i", "f", "standard", uint64(2)},
 				},
 				"node1": []*internal.ResizeSource{
-					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}}, "i", "f", "standard", uint64(3)},
+					{&internal.Node{"node0", &internal.URI{"http", "host0", 10101}, false}, "i", "f", "standard", uint64(3)},
 				},
 				"node2": []*internal.ResizeSource{},
 			},
diff --git a/cluster_test.go b/cluster_test.go
index 5a5fa4de4..5c5c5f89c 100644
--- a/cluster_test.go
+++ b/cluster_test.go
@@ -180,10 +180,10 @@ func TestCluster_Coordinator(t *testing.T) {
 
 	c1 := *pilosa.NewCluster()
 	c1.Node = node1
-	c1.Coordinator = node1.URI
+	c1.Coordinator = node1.ID
 	c2 := *pilosa.NewCluster()
 	c2.Node = node2
-	c2.Coordinator = node1.URI
+	c2.Coordinator = node1.ID
 
 	t.Run("IsCoordinator", func(t *testing.T) {
 		if !c1.IsCoordinator() {
@@ -519,14 +519,14 @@ func TestCluster_SetCoordinator(t *testing.T) {
 		// Set coordinator to the same value.
 		if c.SetCoordinator(oldNode) {
 			t.Errorf("did not expect coordinator to change")
-		} else if c.Coordinator != oldNode.URI {
+		} else if c.Coordinator != oldNode.ID {
 			t.Errorf("expected coordinator: %s, but got: %s", c.Coordinator, oldNode.URI)
 		}
 
 		// Set coordinator to a new value.
 		if !c.SetCoordinator(newNode) {
 			t.Errorf("expected coordinator to change")
-		} else if c.Coordinator != newNode.URI {
+		} else if c.Coordinator != newNode.ID {
 			t.Errorf("expected coordinator: %s, but got: %s", c.Coordinator, newNode.URI)
 		}
 	})
diff --git a/config.go b/config.go
index 4fa06fc51..17841c967 100644
--- a/config.go
+++ b/config.go
@@ -139,7 +139,7 @@ type Config struct {
 
 	Cluster struct {
 		Disabled      bool     `toml:"disabled"`
-		Coordinator   string   `toml:"coordinator"`
+		Coordinator   bool     `toml:"coordinator"`
 		ReplicaN      int      `toml:"replicas"`
 		Hosts         []string `toml:"hosts"`
 		LongQueryTime Duration `toml:"long-query-time"`
@@ -183,7 +183,7 @@ func NewConfig() *Config {
 
 	// Cluster config.
 	c.Cluster.Disabled = DefaultClusterDisabled
-	// c.Cluster.Coordinator = ""
+	// c.Cluster.Coordinator = false
 	c.Cluster.ReplicaN = DefaultReplicaN
 	c.Cluster.Hosts = []string{}
 	c.Cluster.LongQueryTime = Duration(time.Minute)
diff --git a/ctl/server.go b/ctl/server.go
index 18f4f6f93..80eb909d2 100644
--- a/ctl/server.go
+++ b/ctl/server.go
@@ -34,7 +34,7 @@ func BuildServerFlags(cmd *cobra.Command, srv *server.Command) {
 
 	// Cluster
 	flags.BoolVarP(&srv.Config.Cluster.Disabled, "cluster.disabled", "", srv.Config.Cluster.Disabled, "Disabled multi-node cluster communication (used for testing)")
-	flags.StringVarP(&srv.Config.Cluster.Coordinator, "cluster.coordinator", "", "", "Host that will act as cluster coordinator during startup and resizing.")
+	flags.BoolVarP(&srv.Config.Cluster.Coordinator, "cluster.coordinator", "", srv.Config.Cluster.Coordinator, "Host that will act as cluster coordinator during startup and resizing.")
 	flags.IntVarP(&srv.Config.Cluster.ReplicaN, "cluster.replicas", "", 1, "Number of hosts each piece of data should be stored on.")
 	flags.StringSliceVarP(&srv.Config.Cluster.Hosts, "cluster.hosts", "", []string{}, "Comma separated list of hosts in cluster.")
 	flags.DurationVarP((*time.Duration)(&srv.Config.Cluster.LongQueryTime), "cluster.long-query-time", "", time.Minute, "Duration that will trigger log and stat messages for slow queries.")
diff --git a/handler_test.go b/handler_test.go
index 1caf7bf99..0f527514d 100644
--- a/handler_test.go
+++ b/handler_test.go
@@ -147,7 +147,7 @@ func TestHandler_Status(t *testing.T) {
 	h.ServeHTTP(w, test.MustNewHTTPRequest("GET", "/status", nil))
 	if w.Code != http.StatusOK {
 		t.Fatalf("unexpected status code: %d", w.Code)
-	} else if body := w.Body.String(); body != `{"state":"NORMAL","nodes":[{"id":"test-node","uri":{"scheme":"http","host":"localhost","port":10101}}]}`+"\n" {
+	} else if body := w.Body.String(); body != `{"state":"NORMAL","nodes":[{"id":"test-node","uri":{"scheme":"http","host":"localhost","port":10101},"isCoordinator":false}]}`+"\n" {
 		t.Fatalf("unexpected body: %s", body)
 	}
 }
@@ -1212,7 +1212,7 @@ func TestHandler_Fragment_Nodes(t *testing.T) {
 	h.ServeHTTP(w, r)
 	if w.Code != http.StatusOK {
 		t.Fatalf("unexpected status code: %d", w.Code)
-	} else if body := w.Body.String(); body != `[{"id":"node2","uri":{"scheme":"http","host":"host2"}},{"id":"node0","uri":{"scheme":"http","host":"host0"}}]`+"\n" {
+	} else if body := w.Body.String(); body != `[{"id":"node2","uri":{"scheme":"http","host":"host2"},"isCoordinator":false},{"id":"node0","uri":{"scheme":"http","host":"host0"},"isCoordinator":false}]`+"\n" {
 		t.Fatalf("unexpected body: %q", body)
 	}
 
diff --git a/internal/private.pb.go b/internal/private.pb.go
index cdf0dab40..4d2bcdd08 100644
--- a/internal/private.pb.go
+++ b/internal/private.pb.go
@@ -742,8 +742,9 @@ func (m *URI) GetPort() uint32 {
 }
 
 type Node struct {
-	ID  string `protobuf:"bytes,1,opt,name=ID,proto3" json:"ID,omitempty"`
-	URI *URI   `protobuf:"bytes,2,opt,name=URI" json:"URI,omitempty"`
+	ID            string `protobuf:"bytes,1,opt,name=ID,proto3" json:"ID,omitempty"`
+	URI           *URI   `protobuf:"bytes,2,opt,name=URI" json:"URI,omitempty"`
+	IsCoordinator bool   `protobuf:"varint,3,opt,name=IsCoordinator,proto3" json:"IsCoordinator,omitempty"`
 }
 
 func (m *Node) Reset()                    { *m = Node{} }
@@ -765,6 +766,13 @@ func (m *Node) GetURI() *URI {
 	return nil
 }
 
+func (m *Node) GetIsCoordinator() bool {
+	if m != nil {
+		return m.IsCoordinator
+	}
+	return false
+}
+
 type NodeStateMessage struct {
 	NodeID string `protobuf:"bytes,1,opt,name=NodeID,proto3" json:"NodeID,omitempty"`
 	State  string `protobuf:"bytes,2,opt,name=State,proto3" json:"State,omitempty"`
@@ -2136,6 +2144,16 @@ func (m *Node) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += n12
 	}
+	if m.IsCoordinator {
+		dAtA[i] = 0x18
+		i++
+		if m.IsCoordinator {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i++
+	}
 	return i, nil
 }
 
@@ -3068,6 +3086,9 @@ func (m *Node) Size() (n int) {
 		l = m.URI.Size()
 		n += 1 + l + sovPrivate(uint64(l))
 	}
+	if m.IsCoordinator {
+		n += 2
+	}
 	return n
 }
 
@@ -6575,6 +6596,26 @@ func (m *Node) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field IsCoordinator", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.IsCoordinator = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipPrivate(dAtA[iNdEx:])
@@ -8313,86 +8354,87 @@ var (
 func init() { proto.RegisterFile("private.proto", fileDescriptorPrivate) }
 
 var fileDescriptorPrivate = []byte{
-	// 1296 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xac, 0x57, 0x4f, 0x6f, 0x1b, 0x45,
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+	0x2f, 0xd3, 0x5c, 0xea, 0x65, 0x8a, 0x4f, 0x60, 0x7d, 0x2a, 0x4d, 0xcd, 0xa0, 0x3f, 0x10, 0xf5,
+	0xf0, 0x1f, 0xd2, 0xb5, 0x0a, 0xb9, 0x76, 0x18, 0xea, 0x44, 0x15, 0x89, 0x12, 0xf0, 0x23, 0xb8,
+	0xdd, 0x61, 0x3c, 0x95, 0x24, 0x53, 0x6d, 0x75, 0xb0, 0xf7, 0xd9, 0xd9, 0x9c, 0xe3, 0x8b, 0x25,
+	0xbc, 0x0b, 0x85, 0x83, 0x60, 0x10, 0x78, 0xc1, 0xf1, 0xe8, 0x92, 0xa6, 0xad, 0xc2, 0x92, 0x9a,
+	0x49, 0xea, 0x61, 0x50, 0x24, 0x46, 0xc4, 0xb7, 0x44, 0x49, 0x76, 0xa9, 0xd7, 0x1d, 0x7a, 0x94,
+	0x33, 0xf9, 0xbf, 0x13, 0xed, 0x56, 0x7e, 0xbd, 0xa8, 0x59, 0xbf, 0x5d, 0xd4, 0xac, 0xdf, 0x2f,
+	0x6a, 0xd6, 0x4f, 0x7f, 0xd4, 0x5e, 0x3b, 0xca, 0xcb, 0x3f, 0xeb, 0x87, 0xff, 0x04, 0x00, 0x00,
+	0xff, 0xff, 0xd7, 0xef, 0xfa, 0x68, 0x6a, 0x0f, 0x00, 0x00,
 }
diff --git a/internal/private.proto b/internal/private.proto
index b012936d9..5f4a1c6f6 100644
--- a/internal/private.proto
+++ b/internal/private.proto
@@ -136,6 +136,7 @@ message URI {
 message Node {
     string ID = 1;
     URI URI = 2;
+    bool IsCoordinator = 3;
 }
 
 message NodeStateMessage {
diff --git a/server.go b/server.go
index be63a39e3..0dcca4d1e 100644
--- a/server.go
+++ b/server.go
@@ -132,7 +132,11 @@ func (s *Server) Open() error {
 	s.NodeID = s.LoadNodeID()
 
 	// Set Cluster Node.
-	node := &Node{ID: s.NodeID, URI: s.URI}
+	node := &Node{
+		ID:            s.NodeID,
+		URI:           s.URI,
+		IsCoordinator: s.Cluster.Coordinator == s.NodeID,
+	}
 	s.Cluster.Node = node
 
 	// Append the NodeID tag to stats.
@@ -185,11 +189,6 @@ func (s *Server) Open() error {
 		return fmt.Errorf("starting BroadcastReceiver: %v", err)
 	}
 
-	// If a Coordinator is not specified, then default to s.URI.
-	if s.Cluster.Coordinator.Port() == 0 {
-		s.Cluster.Coordinator = s.URI
-	}
-
 	// Open Cluster management.
 	if err := s.Cluster.Open(); err != nil {
 		return fmt.Errorf("opening Cluster: %v", err)
diff --git a/server/cluster_test.go b/server/cluster_test.go
index 299415bc3..81a410e83 100644
--- a/server/cluster_test.go
+++ b/server/cluster_test.go
@@ -52,7 +52,7 @@ func TestMain_SendReceiveMessage(t *testing.T) {
 	m0.Config.Gossip.Port = "0"
 	m0.Config.Gossip.Seeds = []string{}
 
-	m0.Server.Cluster.Coordinator = m0.Server.URI
+	m0.Server.Cluster.Coordinator = m0.Server.NodeID
 	m0.Server.Cluster.Topology = &pilosa.Topology{NodeIDs: []string{m0.Server.NodeID, m1.Server.NodeID}}
 	m0.Server.Cluster.EventReceiver = gossip.NewGossipEventReceiver(m0.Server.LogOutput)
 	gossipMemberSet0, err := gossip.NewGossipMemberSet(m0.Server.URI.HostPort(), m0.Config, m0.Server)
@@ -80,7 +80,7 @@ func TestMain_SendReceiveMessage(t *testing.T) {
 	m1.Config.Gossip.Port = "0"
 	m1.Config.Gossip.Seeds = gossipMemberSet0.Seeds()
 
-	m1.Server.Cluster.Coordinator = m0.Server.URI
+	m1.Server.Cluster.Coordinator = m0.Server.NodeID
 	m1.Server.Cluster.EventReceiver = gossip.NewGossipEventReceiver(m1.Server.LogOutput)
 	gossipMemberSet1, err := gossip.NewGossipMemberSet(m1.Server.URI.HostPort(), m1.Config, m1.Server)
 	if err != nil {
@@ -220,21 +220,21 @@ func TestClusterResize_EmptyNode(t *testing.T) {
 // Ensure that a cluster of empty nodes comes up in a NORMAL state.
 func TestClusterResize_EmptyNodes(t *testing.T) {
 	// Configure node0
-	m0 := test.NewMainWithCluster()
+	m0 := test.NewMainWithCluster(true)
 	defer m0.Close()
 
 	gossipHost := "localhost"
 	gossipPort := 0
-	seed, coord, err := m0.RunWithTransport(gossipHost, gossipPort, []string{}, pilosa.URI{})
+	seed, err := m0.RunWithTransport(gossipHost, gossipPort, []string{})
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	// Configure node1
-	m1 := test.NewMainWithCluster()
+	m1 := test.NewMainWithCluster(false)
 	defer m1.Close()
 
-	seed, coord, err = m1.RunWithTransport(gossipHost, gossipPort, []string{seed}, coord)
+	seed, err = m1.RunWithTransport(gossipHost, gossipPort, []string{seed})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -250,21 +250,21 @@ func TestClusterResize_EmptyNodes(t *testing.T) {
 func TestClusterResize_AddNode(t *testing.T) {
 	t.Run("NoData", func(t *testing.T) {
 		// Configure node0
-		m0 := test.NewMainWithCluster()
+		m0 := test.NewMainWithCluster(true)
 		defer m0.Close()
 
-		seed, coord, err := m0.RunWithTransport("localhost", 0, []string{}, pilosa.URI{})
+		seed, err := m0.RunWithTransport("localhost", 0, []string{})
 		if err != nil {
 			t.Fatal(err)
 		}
 
 		// Configure node1
-		m1 := test.NewMainWithCluster()
+		m1 := test.NewMainWithCluster(false)
 		defer m1.Close()
 
 		var eg errgroup.Group
 		eg.Go(func() error {
-			_, _, err = m1.RunWithTransport("localhost", 0, []string{seed}, coord)
+			_, err = m1.RunWithTransport("localhost", 0, []string{seed})
 			if err != nil {
 				return err
 			}
@@ -284,10 +284,10 @@ func TestClusterResize_AddNode(t *testing.T) {
 	})
 	t.Run("WithIndex", func(t *testing.T) {
 		// Configure node0
-		m0 := test.NewMainWithCluster()
+		m0 := test.NewMainWithCluster(true)
 		defer m0.Close()
 
-		seed, coord, err := m0.RunWithTransport("localhost", 0, []string{}, pilosa.URI{})
+		seed, err := m0.RunWithTransport("localhost", 0, []string{})
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -303,12 +303,12 @@ func TestClusterResize_AddNode(t *testing.T) {
 		}
 
 		// Configure node1
-		m1 := test.NewMainWithCluster()
+		m1 := test.NewMainWithCluster(false)
 		defer m1.Close()
 
 		var eg errgroup.Group
 		eg.Go(func() error {
-			_, _, err = m1.RunWithTransport("localhost", 0, []string{seed}, coord)
+			_, err = m1.RunWithTransport("localhost", 0, []string{seed})
 			if err != nil {
 				return err
 			}
@@ -330,10 +330,10 @@ func TestClusterResize_AddNode(t *testing.T) {
 	t.Run("ContinuousSlices", func(t *testing.T) {
 
 		// Configure node0
-		m0 := test.NewMainWithCluster()
+		m0 := test.NewMainWithCluster(true)
 		defer m0.Close()
 
-		seed, coord, err := m0.RunWithTransport("localhost", 0, []string{}, pilosa.URI{})
+		seed, err := m0.RunWithTransport("localhost", 0, []string{})
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -358,12 +358,12 @@ func TestClusterResize_AddNode(t *testing.T) {
 		}
 
 		// Configure node1
-		m1 := test.NewMainWithCluster()
+		m1 := test.NewMainWithCluster(false)
 		defer m1.Close()
 
 		var eg errgroup.Group
 		eg.Go(func() error {
-			_, _, err = m1.RunWithTransport("localhost", 0, []string{seed}, coord)
+			_, err = m1.RunWithTransport("localhost", 0, []string{seed})
 			if err != nil {
 				return err
 			}
@@ -385,10 +385,10 @@ func TestClusterResize_AddNode(t *testing.T) {
 	t.Run("SkippedSlice", func(t *testing.T) {
 
 		// Configure node0
-		m0 := test.NewMainWithCluster()
+		m0 := test.NewMainWithCluster(true)
 		defer m0.Close()
 
-		seed, coord, err := m0.RunWithTransport("localhost", 0, []string{}, pilosa.URI{})
+		seed, err := m0.RunWithTransport("localhost", 0, []string{})
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -413,12 +413,12 @@ func TestClusterResize_AddNode(t *testing.T) {
 		}
 
 		// Configure node1
-		m1 := test.NewMainWithCluster()
+		m1 := test.NewMainWithCluster(false)
 		defer m1.Close()
 
 		var eg errgroup.Group
 		eg.Go(func() error {
-			_, _, err = m1.RunWithTransport("localhost", 0, []string{seed}, coord)
+			_, err = m1.RunWithTransport("localhost", 0, []string{seed})
 			if err != nil {
 				return err
 			}
@@ -443,22 +443,22 @@ func TestClusterResize_AddNode(t *testing.T) {
 func TestCluster_GossipMembership(t *testing.T) {
 	t.Run("Node0Down", func(t *testing.T) {
 		// Configure node0
-		m0 := test.NewMainWithCluster()
+		m0 := test.NewMainWithCluster(true)
 		defer m0.Close()
 
-		seed, coord, err := m0.RunWithTransport("localhost", 0, []string{}, pilosa.URI{})
+		seed, err := m0.RunWithTransport("localhost", 0, []string{})
 		if err != nil {
 			t.Fatal(err)
 		}
 
 		// Configure node1
-		m1 := test.NewMainWithCluster()
+		m1 := test.NewMainWithCluster(false)
 		defer m1.Close()
 
 		var eg errgroup.Group
 		eg.Go(func() error {
 			// Pass invalid seed as first in list
-			_, _, err = m1.RunWithTransport("localhost", 0, []string{"http://localhost:8765", seed}, coord)
+			_, err = m1.RunWithTransport("localhost", 0, []string{"http://localhost:8765", seed})
 			if err != nil {
 				return err
 			}
@@ -466,12 +466,12 @@ func TestCluster_GossipMembership(t *testing.T) {
 		})
 
 		// Configure node2
-		m2 := test.NewMainWithCluster()
+		m2 := test.NewMainWithCluster(false)
 		defer m2.Close()
 
 		eg.Go(func() error {
 			// Pass invalid seed as last in list
-			_, _, err = m2.RunWithTransport("localhost", 0, []string{seed, "http://localhost:8765"}, coord)
+			_, err = m2.RunWithTransport("localhost", 0, []string{seed, "http://localhost:8765"})
 			if err != nil {
 				return err
 			}
diff --git a/server/server.go b/server/server.go
index cd98ce594..240b8b16b 100644
--- a/server/server.go
+++ b/server/server.go
@@ -181,31 +181,13 @@ func (m *Command) SetupServer() error {
 			InsecureSkipVerify: m.Config.TLS.SkipVerify,
 		}
 
-		// TODO Review this location
-
 		TLSConfig = m.Server.TLS
-
 	}
 	c := pilosa.GetHTTPClient(TLSConfig)
 	m.Server.RemoteClient = c
 	m.Server.Handler.RemoteClient = c
 	m.Server.Cluster.RemoteClient = c
 
-	// Default coordintor to port 0 when not specified so that coordinator
-	// can be set to the value of server.URI after server binds to a port.
-	// This would only be useful in a one-node cluster.
-	coord := m.Config.Cluster.Coordinator
-	if coord == "" {
-		coord = ":0"
-	}
-
-	// Set the coordinator node.
-	curi, err := pilosa.AddressWithDefaults(coord)
-	if err != nil {
-		return err
-	}
-	m.Server.Cluster.Coordinator = *curi
-
 	// Set configuration options.
 	m.Server.AntiEntropyInterval = time.Duration(m.Config.AntiEntropy.Interval)
 	m.Server.Cluster.LongQueryTime = time.Duration(m.Config.Cluster.LongQueryTime)
@@ -214,8 +196,12 @@ func (m *Command) SetupServer() error {
 
 // SetupNetworking sets up internode communication based on the configuration.
 func (m *Command) SetupNetworking() error {
+
+	m.Server.NodeID = m.Server.LoadNodeID()
+
 	if m.Config.Cluster.Disabled {
 		m.Server.Cluster.Static = true
+		m.Server.Cluster.Coordinator = m.Server.NodeID
 		for _, address := range m.Config.Cluster.Hosts {
 			uri, err := pilosa.NewURIFromAddress(address)
 			if err != nil {
@@ -256,7 +242,10 @@ func (m *Command) SetupNetworking() error {
 		}
 	}
 
-	m.Server.NodeID = m.Server.LoadNodeID()
+	// Set Coordinator.
+	if m.Config.Cluster.Coordinator || len(m.Config.Gossip.Seeds) == 0 {
+		m.Server.Cluster.Coordinator = m.Server.NodeID
+	}
 
 	m.Server.Cluster.EventReceiver = gossip.NewGossipEventReceiver(m.Server.LogOutput)
 	gossipMemberSet, err := gossip.NewGossipMemberSetWithTransport(m.Server.NodeID, m.Config, transport, m.Server)
diff --git a/test/cluster.go b/test/cluster.go
index 536641b13..8362ca964 100644
--- a/test/cluster.go
+++ b/test/cluster.go
@@ -49,7 +49,7 @@ func NewCluster(n int) *pilosa.Cluster {
 	}
 
 	c.Node = c.Nodes[0]
-	c.Coordinator = c.Nodes[0].URI
+	c.Coordinator = c.Nodes[0].ID
 
 	return c
 }
@@ -262,7 +262,7 @@ func (t *TestCluster) addCluster(i int, saveTopology bool) (*pilosa.Cluster, err
 	c.Holder = h
 	c.MemberSet = pilosa.NewStaticMemberSet(c.Nodes)
 	c.Node = node
-	c.Coordinator = t.common.Nodes[0].URI // the first node is the coordinator
+	c.Coordinator = t.common.Nodes[0].ID // the first node is the coordinator
 	c.Broadcaster = t
 
 	// add nodes
diff --git a/test/pilosa.go b/test/pilosa.go
index 8facad563..2bfd0c1a6 100644
--- a/test/pilosa.go
+++ b/test/pilosa.go
@@ -65,9 +65,10 @@ func NewMain() *Main {
 }
 
 // NewMainWithCluster returns a new instance of Main with clustering enabled.
-func NewMainWithCluster() *Main {
+func NewMainWithCluster(isCoordinator bool) *Main {
 	m := NewMain()
 	m.Config.Cluster.Disabled = false
+	m.Config.Cluster.Coordinator = isCoordinator
 	return m
 }
 
@@ -94,12 +95,11 @@ func runMainWithCluster(size int) ([]*Main, error) {
 	gossipPort := 0
 	var err error
 	var gossipSeeds = make([]string, size)
-	var coordinator pilosa.URI
 
 	for i := 0; i < size; i++ {
-		m := NewMainWithCluster()
+		m := NewMainWithCluster(i == 0)
 
-		gossipSeeds[i], coordinator, err = m.RunWithTransport(gossipHost, gossipPort, gossipSeeds[:i], coordinator)
+		gossipSeeds[i], err = m.RunWithTransport(gossipHost, gossipPort, gossipSeeds[:i])
 		if err != nil {
 			return nil, errors.Wrap(err, "RunWithTransport")
 		}
@@ -146,7 +146,7 @@ func (m *Main) Reopen() error {
 }
 
 // RunWithTransport runs Main and returns the dynamically allocated gossip port.
-func (m *Main) RunWithTransport(host string, bindPort int, joinSeeds []string, coordinator pilosa.URI) (seed string, coord pilosa.URI, err error) {
+func (m *Main) RunWithTransport(host string, bindPort int, joinSeeds []string) (seed string, err error) {
 	defer close(m.Started)
 
 	/*
@@ -166,19 +166,19 @@ func (m *Main) RunWithTransport(host string, bindPort int, joinSeeds []string, c
 	// SetupServer
 	err = m.SetupServer()
 	if err != nil {
-		return seed, coord, err
+		return seed, err
 	}
 
 	// Open server listener.
 	err = m.Server.OpenListener()
 	if err != nil {
-		return seed, coord, err
+		return seed, err
 	}
 
 	// Open gossip transport to use in SetupServer.
 	transport, err := gossip.NewTransport(host, bindPort)
 	if err != nil {
-		return seed, coord, err
+		return seed, err
 	}
 	m.GossipTransport = transport
 
@@ -193,23 +193,22 @@ func (m *Main) RunWithTransport(host string, bindPort int, joinSeeds []string, c
 	// SetupNetworking
 	err = m.SetupNetworking()
 	if err != nil {
-		return seed, coord, err
+		return seed, err
 	}
 
 	if err = m.Server.BroadcastReceiver.Start(m.Server); err != nil {
-		return seed, coord, err
+		return seed, err
 	}
 
-	m.Server.Cluster.Coordinator = coordinator
 	m.Server.Cluster.Static = false
 
 	// Initialize server.
 	err = m.Server.Open()
 	if err != nil {
-		return seed, coord, err
+		return seed, err
 	}
 
-	return seed, m.Server.Cluster.Coordinator, nil
+	return seed, nil
 }
 
 // URL returns the base URL string for accessing the running program.

From fa4e543e84c5ecaa4ea5222da2454d35085f54f7 Mon Sep 17 00:00:00 2001
From: Travis Turner <travis@pilosa.com>
Date: Mon, 26 Feb 2018 15:41:04 -0600
Subject: [PATCH 2/3] send a NodeJoin event on startup for cases where a quick
 restart has occurred and memberlist is not aware of it

---
 broadcast.go           |   5 +
 cluster.go             |  31 ++-
 internal/private.pb.go | 421 +++++++++++++++++++++++++++++------------
 internal/private.proto |   5 +
 server.go              |   2 +
 5 files changed, 338 insertions(+), 126 deletions(-)

diff --git a/broadcast.go b/broadcast.go
index 62d69e9ff..6dbb0f771 100644
--- a/broadcast.go
+++ b/broadcast.go
@@ -136,6 +136,7 @@ const (
 	MessageTypeSetCoordinator
 	MessageTypeNodeState
 	MessageTypeRecalculateCaches
+	MessageTypeNodeEvent
 )
 
 // MarshalMessage encodes the protobuf message into a byte slice.
@@ -176,6 +177,8 @@ func MarshalMessage(m proto.Message) ([]byte, error) {
 		typ = MessageTypeNodeState
 	case *internal.RecalculateCaches:
 		typ = MessageTypeRecalculateCaches
+	case *internal.NodeEventMessage:
+		typ = MessageTypeNodeEvent
 	default:
 		return nil, fmt.Errorf("message type not implemented for marshalling: %s", reflect.TypeOf(obj))
 	}
@@ -226,6 +229,8 @@ func UnmarshalMessage(buf []byte) (proto.Message, error) {
 		m = &internal.NodeStateMessage{}
 	case MessageTypeRecalculateCaches:
 		m = &internal.RecalculateCaches{}
+	case MessageTypeNodeEvent:
+		m = &internal.NodeEventMessage{}
 	default:
 		return nil, fmt.Errorf("invalid message type: %d", typ)
 	}
diff --git a/cluster.go b/cluster.go
index 8cdd1e922..b93e6105c 100644
--- a/cluster.go
+++ b/cluster.go
@@ -114,6 +114,13 @@ func DecodeNode(node *internal.Node) *Node {
 	}
 }
 
+func DecodeNodeEvent(ne *internal.NodeEventMessage) *NodeEvent {
+	return &NodeEvent{
+		Event: NodeEventType(ne.Event),
+		Node:  DecodeNode(ne.Node),
+	}
+}
+
 // Nodes represents a list of nodes.
 type Nodes []*Node
 
@@ -897,6 +904,22 @@ func (c *Cluster) Open() error {
 
 	// If not coordinator then wait for ClusterStatus from coordinator.
 	if !c.IsCoordinator() {
+		// In the case where a node has been restarted and memberlist has
+		// not had enough time to determine the node went down/up, then
+		// the coorninator needs to be alerted that this node is back up
+		// (and now in a state of STARTING) so that it can be put to the correct
+		// cluster state.
+		// TODO: Because the normal code path already sends a NodeJoin event (via
+		// memberlist), this it a bit redundant in most cases. Perhaps determine
+		// that the node has been restarted and don't do this step.
+		msg := &internal.NodeEventMessage{
+			Event: uint32(NodeJoin),
+			Node:  EncodeNode(c.Node),
+		}
+		if err := c.Broadcaster.SendAsync(msg); err != nil {
+			return fmt.Errorf("sending restart NodeJoin: %v", err)
+		}
+
 		c.logger().Printf("wait for joining to complete")
 		<-c.joining
 		c.logger().Printf("joining has completed")
@@ -1678,9 +1701,11 @@ func (c *Cluster) nodeJoin(node *Node) error {
 		return nil
 	}
 
-	// Don't do anything else if the cluster already contains the node.
-	if c.nodeByID(node.ID) != nil {
-		return nil
+	// If the cluster already contains the node, just send it the cluster status.
+	// This is useful in the case where a node is restarted or temporarily leaves
+	// the cluster.
+	if node := c.nodeByID(node.ID); node != nil {
+		return c.sendTo(node, c.Status())
 	}
 
 	// If the holder does not yet contain data, go ahead and add the node.
diff --git a/internal/private.pb.go b/internal/private.pb.go
index 4d2bcdd08..37b109014 100644
--- a/internal/private.pb.go
+++ b/internal/private.pb.go
@@ -34,6 +34,7 @@
 		URI
 		Node
 		NodeStateMessage
+		NodeEventMessage
 		NodeStatus
 		ClusterStatus
 		Field
@@ -797,6 +798,30 @@ func (m *NodeStateMessage) GetState() string {
 	return ""
 }
 
+type NodeEventMessage struct {
+	Event uint32 `protobuf:"varint,1,opt,name=Event,proto3" json:"Event,omitempty"`
+	Node  *Node  `protobuf:"bytes,2,opt,name=Node" json:"Node,omitempty"`
+}
+
+func (m *NodeEventMessage) Reset()                    { *m = NodeEventMessage{} }
+func (m *NodeEventMessage) String() string            { return proto.CompactTextString(m) }
+func (*NodeEventMessage) ProtoMessage()               {}
+func (*NodeEventMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{25} }
+
+func (m *NodeEventMessage) GetEvent() uint32 {
+	if m != nil {
+		return m.Event
+	}
+	return 0
+}
+
+func (m *NodeEventMessage) GetNode() *Node {
+	if m != nil {
+		return m.Node
+	}
+	return nil
+}
+
 type NodeStatus struct {
 	Node      *Node      `protobuf:"bytes,1,opt,name=Node" json:"Node,omitempty"`
 	MaxSlices *MaxSlices `protobuf:"bytes,2,opt,name=MaxSlices" json:"MaxSlices,omitempty"`
@@ -806,7 +831,7 @@ type NodeStatus struct {
 func (m *NodeStatus) Reset()                    { *m = NodeStatus{} }
 func (m *NodeStatus) String() string            { return proto.CompactTextString(m) }
 func (*NodeStatus) ProtoMessage()               {}
-func (*NodeStatus) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{25} }
+func (*NodeStatus) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{26} }
 
 func (m *NodeStatus) GetNode() *Node {
 	if m != nil {
@@ -838,7 +863,7 @@ type ClusterStatus struct {
 func (m *ClusterStatus) Reset()                    { *m = ClusterStatus{} }
 func (m *ClusterStatus) String() string            { return proto.CompactTextString(m) }
 func (*ClusterStatus) ProtoMessage()               {}
-func (*ClusterStatus) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{26} }
+func (*ClusterStatus) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{27} }
 
 func (m *ClusterStatus) GetClusterID() string {
 	if m != nil {
@@ -871,7 +896,7 @@ type Field struct {
 func (m *Field) Reset()                    { *m = Field{} }
 func (m *Field) String() string            { return proto.CompactTextString(m) }
 func (*Field) ProtoMessage()               {}
-func (*Field) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{27} }
+func (*Field) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{28} }
 
 func (m *Field) GetName() string {
 	if m != nil {
@@ -910,7 +935,7 @@ type CreateViewMessage struct {
 func (m *CreateViewMessage) Reset()                    { *m = CreateViewMessage{} }
 func (m *CreateViewMessage) String() string            { return proto.CompactTextString(m) }
 func (*CreateViewMessage) ProtoMessage()               {}
-func (*CreateViewMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{28} }
+func (*CreateViewMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{29} }
 
 func (m *CreateViewMessage) GetIndex() string {
 	if m != nil {
@@ -942,7 +967,7 @@ type DeleteViewMessage struct {
 func (m *DeleteViewMessage) Reset()                    { *m = DeleteViewMessage{} }
 func (m *DeleteViewMessage) String() string            { return proto.CompactTextString(m) }
 func (*DeleteViewMessage) ProtoMessage()               {}
-func (*DeleteViewMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{29} }
+func (*DeleteViewMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{30} }
 
 func (m *DeleteViewMessage) GetIndex() string {
 	if m != nil {
@@ -977,7 +1002,7 @@ type ResizeInstruction struct {
 func (m *ResizeInstruction) Reset()                    { *m = ResizeInstruction{} }
 func (m *ResizeInstruction) String() string            { return proto.CompactTextString(m) }
 func (*ResizeInstruction) ProtoMessage()               {}
-func (*ResizeInstruction) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{30} }
+func (*ResizeInstruction) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{31} }
 
 func (m *ResizeInstruction) GetJobID() int64 {
 	if m != nil {
@@ -1032,7 +1057,7 @@ type ResizeSource struct {
 func (m *ResizeSource) Reset()                    { *m = ResizeSource{} }
 func (m *ResizeSource) String() string            { return proto.CompactTextString(m) }
 func (*ResizeSource) ProtoMessage()               {}
-func (*ResizeSource) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{31} }
+func (*ResizeSource) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{32} }
 
 func (m *ResizeSource) GetNode() *Node {
 	if m != nil {
@@ -1079,7 +1104,7 @@ func (m *ResizeInstructionComplete) Reset()         { *m = ResizeInstructionComp
 func (m *ResizeInstructionComplete) String() string { return proto.CompactTextString(m) }
 func (*ResizeInstructionComplete) ProtoMessage()    {}
 func (*ResizeInstructionComplete) Descriptor() ([]byte, []int) {
-	return fileDescriptorPrivate, []int{32}
+	return fileDescriptorPrivate, []int{33}
 }
 
 func (m *ResizeInstructionComplete) GetJobID() int64 {
@@ -1110,7 +1135,7 @@ type SetCoordinatorMessage struct {
 func (m *SetCoordinatorMessage) Reset()                    { *m = SetCoordinatorMessage{} }
 func (m *SetCoordinatorMessage) String() string            { return proto.CompactTextString(m) }
 func (*SetCoordinatorMessage) ProtoMessage()               {}
-func (*SetCoordinatorMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{33} }
+func (*SetCoordinatorMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{34} }
 
 func (m *SetCoordinatorMessage) GetNew() *Node {
 	if m != nil {
@@ -1127,7 +1152,7 @@ type Topology struct {
 func (m *Topology) Reset()                    { *m = Topology{} }
 func (m *Topology) String() string            { return proto.CompactTextString(m) }
 func (*Topology) ProtoMessage()               {}
-func (*Topology) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{34} }
+func (*Topology) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{35} }
 
 func (m *Topology) GetClusterID() string {
 	if m != nil {
@@ -1149,7 +1174,7 @@ type RecalculateCaches struct {
 func (m *RecalculateCaches) Reset()                    { *m = RecalculateCaches{} }
 func (m *RecalculateCaches) String() string            { return proto.CompactTextString(m) }
 func (*RecalculateCaches) ProtoMessage()               {}
-func (*RecalculateCaches) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{35} }
+func (*RecalculateCaches) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{36} }
 
 func init() {
 	proto.RegisterType((*IndexMeta)(nil), "internal.IndexMeta")
@@ -1177,6 +1202,7 @@ func init() {
 	proto.RegisterType((*URI)(nil), "internal.URI")
 	proto.RegisterType((*Node)(nil), "internal.Node")
 	proto.RegisterType((*NodeStateMessage)(nil), "internal.NodeStateMessage")
+	proto.RegisterType((*NodeEventMessage)(nil), "internal.NodeEventMessage")
 	proto.RegisterType((*NodeStatus)(nil), "internal.NodeStatus")
 	proto.RegisterType((*ClusterStatus)(nil), "internal.ClusterStatus")
 	proto.RegisterType((*Field)(nil), "internal.Field")
@@ -2187,6 +2213,39 @@ func (m *NodeStateMessage) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *NodeEventMessage) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *NodeEventMessage) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.Event != 0 {
+		dAtA[i] = 0x8
+		i++
+		i = encodeVarintPrivate(dAtA, i, uint64(m.Event))
+	}
+	if m.Node != nil {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintPrivate(dAtA, i, uint64(m.Node.Size()))
+		n13, err := m.Node.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n13
+	}
+	return i, nil
+}
+
 func (m *NodeStatus) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -2206,32 +2265,32 @@ func (m *NodeStatus) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0xa
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.Node.Size()))
-		n13, err := m.Node.MarshalTo(dAtA[i:])
-		if err != nil {
-			return 0, err
-		}
-		i += n13
-	}
-	if m.MaxSlices != nil {
-		dAtA[i] = 0x12
-		i++
-		i = encodeVarintPrivate(dAtA, i, uint64(m.MaxSlices.Size()))
-		n14, err := m.MaxSlices.MarshalTo(dAtA[i:])
+		n14, err := m.Node.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
 		i += n14
 	}
-	if m.Schema != nil {
-		dAtA[i] = 0x1a
+	if m.MaxSlices != nil {
+		dAtA[i] = 0x12
 		i++
-		i = encodeVarintPrivate(dAtA, i, uint64(m.Schema.Size()))
-		n15, err := m.Schema.MarshalTo(dAtA[i:])
+		i = encodeVarintPrivate(dAtA, i, uint64(m.MaxSlices.Size()))
+		n15, err := m.MaxSlices.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
 		i += n15
 	}
+	if m.Schema != nil {
+		dAtA[i] = 0x1a
+		i++
+		i = encodeVarintPrivate(dAtA, i, uint64(m.Schema.Size()))
+		n16, err := m.Schema.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n16
+	}
 	return i, nil
 }
 
@@ -2413,21 +2472,21 @@ func (m *ResizeInstruction) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.Node.Size()))
-		n16, err := m.Node.MarshalTo(dAtA[i:])
+		n17, err := m.Node.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n16
+		i += n17
 	}
 	if m.Coordinator != nil {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.Coordinator.Size()))
-		n17, err := m.Coordinator.MarshalTo(dAtA[i:])
+		n18, err := m.Coordinator.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n17
+		i += n18
 	}
 	if len(m.Sources) > 0 {
 		for _, msg := range m.Sources {
@@ -2445,21 +2504,21 @@ func (m *ResizeInstruction) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x2a
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.Schema.Size()))
-		n18, err := m.Schema.MarshalTo(dAtA[i:])
+		n19, err := m.Schema.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n18
+		i += n19
 	}
 	if m.ClusterStatus != nil {
 		dAtA[i] = 0x32
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.ClusterStatus.Size()))
-		n19, err := m.ClusterStatus.MarshalTo(dAtA[i:])
+		n20, err := m.ClusterStatus.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n19
+		i += n20
 	}
 	return i, nil
 }
@@ -2483,11 +2542,11 @@ func (m *ResizeSource) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0xa
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.Node.Size()))
-		n20, err := m.Node.MarshalTo(dAtA[i:])
+		n21, err := m.Node.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n20
+		i += n21
 	}
 	if len(m.Index) > 0 {
 		dAtA[i] = 0x12
@@ -2539,11 +2598,11 @@ func (m *ResizeInstructionComplete) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.Node.Size()))
-		n21, err := m.Node.MarshalTo(dAtA[i:])
+		n22, err := m.Node.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n21
+		i += n22
 	}
 	if len(m.Error) > 0 {
 		dAtA[i] = 0x1a
@@ -2573,11 +2632,11 @@ func (m *SetCoordinatorMessage) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0xa
 		i++
 		i = encodeVarintPrivate(dAtA, i, uint64(m.New.Size()))
-		n22, err := m.New.MarshalTo(dAtA[i:])
+		n23, err := m.New.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n22
+		i += n23
 	}
 	return i, nil
 }
@@ -3106,6 +3165,19 @@ func (m *NodeStateMessage) Size() (n int) {
 	return n
 }
 
+func (m *NodeEventMessage) Size() (n int) {
+	var l int
+	_ = l
+	if m.Event != 0 {
+		n += 1 + sovPrivate(uint64(m.Event))
+	}
+	if m.Node != nil {
+		l = m.Node.Size()
+		n += 1 + l + sovPrivate(uint64(l))
+	}
+	return n
+}
+
 func (m *NodeStatus) Size() (n int) {
 	var l int
 	_ = l
@@ -6745,6 +6817,108 @@ func (m *NodeStateMessage) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *NodeEventMessage) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowPrivate
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: NodeEventMessage: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: NodeEventMessage: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Event", wireType)
+			}
+			m.Event = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Event |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Node", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Node == nil {
+				m.Node = &Node{}
+			}
+			if err := m.Node.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipPrivate(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *NodeStatus) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
@@ -8354,87 +8528,88 @@ var (
 func init() { proto.RegisterFile("private.proto", fileDescriptorPrivate) }
 
 var fileDescriptorPrivate = []byte{
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+	0x2f, 0x05, 0x58, 0x63, 0x22, 0xf1, 0x5f, 0x0a, 0x2f, 0x4c, 0x64, 0x3c, 0x4a, 0x07, 0xdc, 0x27,
+	0xd1, 0xae, 0x09, 0xb5, 0xcb, 0xb4, 0xf0, 0x3a, 0x95, 0x44, 0x6e, 0xaa, 0xdf, 0xa3, 0xc9, 0xea,
+	0x9f, 0x55, 0xcd, 0xab, 0x90, 0x9b, 0xb0, 0xd4, 0x8d, 0x46, 0x71, 0x2f, 0xbd, 0x06, 0xd7, 0x33,
+	0x6d, 0xcd, 0x4c, 0x2f, 0x33, 0xab, 0x96, 0xab, 0xa3, 0xd2, 0xf1, 0x75, 0x44, 0xee, 0x4e, 0xd5,
+	0x11, 0xfe, 0xb9, 0xac, 0x6c, 0xbf, 0x99, 0x19, 0x4c, 0x2c, 0xb3, 0x49, 0x6d, 0xfa, 0x83, 0x03,
+	0xe7, 0xf2, 0x14, 0x5e, 0xab, 0x31, 0xd2, 0x8c, 0x14, 0xe6, 0x66, 0xc4, 0x9d, 0x97, 0x91, 0x62,
+	0x96, 0x91, 0xec, 0x9d, 0x5b, 0xca, 0xbd, 0x73, 0xe9, 0x3e, 0x5c, 0x9e, 0x49, 0x53, 0x2b, 0x1a,
+	0x0c, 0x55, 0x3d, 0xfc, 0x87, 0x74, 0xa9, 0x91, 0x11, 0xc7, 0x26, 0x51, 0x15, 0xa6, 0x05, 0x7a,
+	0x1b, 0x2e, 0x75, 0x85, 0xcc, 0x25, 0xc9, 0x56, 0x5b, 0x13, 0xdc, 0xc7, 0xe2, 0x70, 0xc1, 0xf1,
+	0xd5, 0x12, 0xbd, 0x0f, 0xcb, 0x4f, 0xa3, 0x61, 0x14, 0x44, 0x7b, 0xe3, 0x13, 0x9a, 0xb6, 0x0e,
+	0x4b, 0x7a, 0xc2, 0xe9, 0x67, 0x46, 0x85, 0x59, 0x91, 0x5e, 0x50, 0x25, 0xd9, 0xe3, 0x41, 0x6f,
+	0x14, 0x70, 0x29, 0xf0, 0xef, 0x29, 0xb9, 0x5f, 0xfb, 0xed, 0x55, 0xc3, 0xf9, 0xfd, 0x55, 0xc3,
+	0xf9, 0xe3, 0x55, 0xc3, 0xf9, 0xf9, 0xcf, 0xc6, 0x1b, 0xbb, 0x65, 0xfc, 0x4f, 0xbf, 0xf5, 0x6f,
+	0x00, 0x00, 0x00, 0xff, 0xff, 0x30, 0x4b, 0x92, 0xf6, 0xb8, 0x0f, 0x00, 0x00,
 }
diff --git a/internal/private.proto b/internal/private.proto
index 5f4a1c6f6..5755ce2f6 100644
--- a/internal/private.proto
+++ b/internal/private.proto
@@ -144,6 +144,11 @@ message NodeStateMessage {
     string State = 2;
 }
 
+message NodeEventMessage {
+    uint32 Event = 1;
+    Node Node = 2;
+}
+
 message NodeStatus {
     Node Node = 1;
     MaxSlices MaxSlices = 2;
diff --git a/server.go b/server.go
index 0dcca4d1e..c52c28cbd 100644
--- a/server.go
+++ b/server.go
@@ -463,6 +463,8 @@ func (s *Server) ReceiveMessage(pb proto.Message) error {
 		}
 	case *internal.RecalculateCaches:
 		s.Holder.RecalculateCaches()
+	case *internal.NodeEventMessage:
+		s.Cluster.ReceiveEvent(DecodeNodeEvent(obj))
 	}
 
 	return nil

From 2a462d5e42c0fb413a37e10261a41476d62bdfbe Mon Sep 17 00:00:00 2001
From: Travis Turner <travis@pilosa.com>
Date: Thu, 8 Mar 2018 14:18:10 -0600
Subject: [PATCH 3/3] make sure cluster.Nodes[].IsCoordinator values get
 updated. return old coordinator node in response.

---
 broadcast.go           |   5 +
 cluster.go             |  53 +++++--
 cluster_test.go        |  12 +-
 handler.go             |  15 +-
 internal/private.pb.go | 312 +++++++++++++++++++++++++++++------------
 internal/private.proto |   4 +
 server.go              |   2 +
 7 files changed, 295 insertions(+), 108 deletions(-)

diff --git a/broadcast.go b/broadcast.go
index 6dbb0f771..a4e6403c1 100644
--- a/broadcast.go
+++ b/broadcast.go
@@ -134,6 +134,7 @@ const (
 	MessageTypeResizeInstruction
 	MessageTypeResizeInstructionComplete
 	MessageTypeSetCoordinator
+	MessageTypeUpdateCoordinator
 	MessageTypeNodeState
 	MessageTypeRecalculateCaches
 	MessageTypeNodeEvent
@@ -173,6 +174,8 @@ func MarshalMessage(m proto.Message) ([]byte, error) {
 		typ = MessageTypeResizeInstructionComplete
 	case *internal.SetCoordinatorMessage:
 		typ = MessageTypeSetCoordinator
+	case *internal.UpdateCoordinatorMessage:
+		typ = MessageTypeUpdateCoordinator
 	case *internal.NodeStateMessage:
 		typ = MessageTypeNodeState
 	case *internal.RecalculateCaches:
@@ -225,6 +228,8 @@ func UnmarshalMessage(buf []byte) (proto.Message, error) {
 		m = &internal.ResizeInstructionComplete{}
 	case MessageTypeSetCoordinator:
 		m = &internal.SetCoordinatorMessage{}
+	case MessageTypeUpdateCoordinator:
+		m = &internal.UpdateCoordinatorMessage{}
 	case MessageTypeNodeState:
 		m = &internal.NodeStateMessage{}
 	case MessageTypeRecalculateCaches:
diff --git a/cluster.go b/cluster.go
index b93e6105c..a5b7b654f 100644
--- a/cluster.go
+++ b/cluster.go
@@ -309,20 +309,51 @@ func (c *Cluster) IsCoordinator() bool {
 	return c.Coordinator == c.Node.ID
 }
 
-// SetCoordinator updates the Coordinator to n.
-// Returns true if the Coordinator changed.
-func (c *Cluster) SetCoordinator(n *Node) bool {
-	// Get new node.
-	newNode := c.nodeByID(n.ID)
-	if newNode == nil {
-		return false
+// SetCoordinator tells the current node to become the
+// Coordinator. In response to this, the current node
+// will consider itself coordinator and update the other
+// nodes with its version of Cluster.Status.
+func (c *Cluster) SetCoordinator(n *Node) error {
+	// Verify that the new Coordinator value matches
+	// this node.
+	if c.Node.ID != n.ID {
+		return fmt.Errorf("coordinator node does not match this node")
 	}
 
-	if c.Coordinator != newNode.ID {
-		c.Coordinator = newNode.ID
-		return true
+	// Update IsCoordinator on all nodes (locally).
+	_ = c.UpdateCoordinator(n)
+
+	// Send the update coordinator message to all nodes.
+	err := c.Broadcaster.SendSync(
+		&internal.UpdateCoordinatorMessage{
+			New: EncodeNode(n),
+		})
+	if err != nil {
+		return fmt.Errorf("problem sending UpdateCoordinator message: %v", err)
 	}
-	return false
+
+	// Broadcast cluster status.
+	return c.Broadcaster.SendSync(c.Status())
+}
+
+// UpdateCoordinator updates this nodes Coordinator value as well as
+// changing the corresponding node's IsCoordinator value
+// to true, and sets all other nodes to false. Returns true if the value
+// changed.
+func (c *Cluster) UpdateCoordinator(n *Node) bool {
+	var changed bool
+	if c.Coordinator != n.ID {
+		c.Coordinator = n.ID
+		changed = true
+	}
+	for _, node := range c.Nodes {
+		if node.ID == n.ID {
+			node.IsCoordinator = true
+		} else {
+			node.IsCoordinator = false
+		}
+	}
+	return changed
 }
 
 // AddNode adds a node to the Cluster and updates and saves the
diff --git a/cluster_test.go b/cluster_test.go
index 5c5c5f89c..c5c01d58d 100644
--- a/cluster_test.go
+++ b/cluster_test.go
@@ -509,22 +509,22 @@ func TestCluster_ResizeStates(t *testing.T) {
 }
 
 // Ensures that coordinator can be changed.
-func TestCluster_SetCoordinator(t *testing.T) {
-	t.Run("SetCoordinator", func(t *testing.T) {
+func TestCluster_UpdateCoordinator(t *testing.T) {
+	t.Run("UpdateCoordinator", func(t *testing.T) {
 		c := test.NewCluster(2)
 
 		oldNode := c.Nodes[0]
 		newNode := c.Nodes[1]
 
-		// Set coordinator to the same value.
-		if c.SetCoordinator(oldNode) {
+		// Update coordinator to the same value.
+		if c.UpdateCoordinator(oldNode) {
 			t.Errorf("did not expect coordinator to change")
 		} else if c.Coordinator != oldNode.ID {
 			t.Errorf("expected coordinator: %s, but got: %s", c.Coordinator, oldNode.URI)
 		}
 
-		// Set coordinator to a new value.
-		if !c.SetCoordinator(newNode) {
+		// Update coordinator to a new value.
+		if !c.UpdateCoordinator(newNode) {
 			t.Errorf("expected coordinator to change")
 		} else if c.Coordinator != newNode.ID {
 			t.Errorf("expected coordinator: %s, but got: %s", c.Coordinator, newNode.URI)
diff --git a/handler.go b/handler.go
index 38fd24eca..cea42e6ac 100644
--- a/handler.go
+++ b/handler.go
@@ -2026,6 +2026,7 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r
 		return
 	}
 
+	oldNode := h.Cluster.nodeByID(h.Cluster.Coordinator)
 	newNode := h.Cluster.nodeByID(req.ID)
 	if newNode == nil {
 		http.Error(w, "Node with provided ID does not exist", http.StatusBadRequest)
@@ -2033,8 +2034,14 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r
 	}
 
 	if err := func() error {
-		// Send the set-coordinator message to all nodes.
-		err := h.Broadcaster.SendSync(
+		// If the new coordinator is this node, do the SetCoordinator directly.
+		if newNode.ID == h.Node.ID {
+			return h.Cluster.SetCoordinator(newNode)
+		}
+
+		// Send the set-coordinator message to new node.
+		err := h.Broadcaster.SendTo(
+			newNode,
 			&internal.SetCoordinatorMessage{
 				New: EncodeNode(newNode),
 			})
@@ -2042,9 +2049,6 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r
 			return fmt.Errorf("problem sending SetCoordinator message: %s", err)
 		}
 
-		// Set Coordinator on local node.
-		_ = h.Cluster.SetCoordinator(newNode)
-
 		return nil
 	}(); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -2053,6 +2057,7 @@ func (h *Handler) handlePostClusterResizeSetCoordinator(w http.ResponseWriter, r
 
 	// Encode response.
 	if err := json.NewEncoder(w).Encode(setCoordinatorResponse{
+		Old: oldNode,
 		New: newNode,
 	}); err != nil {
 		h.logger().Printf("response encoding error: %s", err)
diff --git a/internal/private.pb.go b/internal/private.pb.go
index 37b109014..1b7f71ac4 100644
--- a/internal/private.pb.go
+++ b/internal/private.pb.go
@@ -44,6 +44,7 @@
 		ResizeSource
 		ResizeInstructionComplete
 		SetCoordinatorMessage
+		UpdateCoordinatorMessage
 		Topology
 		RecalculateCaches
 */
@@ -1144,6 +1145,22 @@ func (m *SetCoordinatorMessage) GetNew() *Node {
 	return nil
 }
 
+type UpdateCoordinatorMessage struct {
+	New *Node `protobuf:"bytes,1,opt,name=New" json:"New,omitempty"`
+}
+
+func (m *UpdateCoordinatorMessage) Reset()                    { *m = UpdateCoordinatorMessage{} }
+func (m *UpdateCoordinatorMessage) String() string            { return proto.CompactTextString(m) }
+func (*UpdateCoordinatorMessage) ProtoMessage()               {}
+func (*UpdateCoordinatorMessage) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{35} }
+
+func (m *UpdateCoordinatorMessage) GetNew() *Node {
+	if m != nil {
+		return m.New
+	}
+	return nil
+}
+
 type Topology struct {
 	ClusterID string   `protobuf:"bytes,1,opt,name=ClusterID,proto3" json:"ClusterID,omitempty"`
 	NodeIDs   []string `protobuf:"bytes,2,rep,name=NodeIDs" json:"NodeIDs,omitempty"`
@@ -1152,7 +1169,7 @@ type Topology struct {
 func (m *Topology) Reset()                    { *m = Topology{} }
 func (m *Topology) String() string            { return proto.CompactTextString(m) }
 func (*Topology) ProtoMessage()               {}
-func (*Topology) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{35} }
+func (*Topology) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{36} }
 
 func (m *Topology) GetClusterID() string {
 	if m != nil {
@@ -1174,7 +1191,7 @@ type RecalculateCaches struct {
 func (m *RecalculateCaches) Reset()                    { *m = RecalculateCaches{} }
 func (m *RecalculateCaches) String() string            { return proto.CompactTextString(m) }
 func (*RecalculateCaches) ProtoMessage()               {}
-func (*RecalculateCaches) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{36} }
+func (*RecalculateCaches) Descriptor() ([]byte, []int) { return fileDescriptorPrivate, []int{37} }
 
 func init() {
 	proto.RegisterType((*IndexMeta)(nil), "internal.IndexMeta")
@@ -1212,6 +1229,7 @@ func init() {
 	proto.RegisterType((*ResizeSource)(nil), "internal.ResizeSource")
 	proto.RegisterType((*ResizeInstructionComplete)(nil), "internal.ResizeInstructionComplete")
 	proto.RegisterType((*SetCoordinatorMessage)(nil), "internal.SetCoordinatorMessage")
+	proto.RegisterType((*UpdateCoordinatorMessage)(nil), "internal.UpdateCoordinatorMessage")
 	proto.RegisterType((*Topology)(nil), "internal.Topology")
 	proto.RegisterType((*RecalculateCaches)(nil), "internal.RecalculateCaches")
 }
@@ -2641,6 +2659,34 @@ func (m *SetCoordinatorMessage) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *UpdateCoordinatorMessage) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *UpdateCoordinatorMessage) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.New != nil {
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintPrivate(dAtA, i, uint64(m.New.Size()))
+		n24, err := m.New.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n24
+	}
+	return i, nil
+}
+
 func (m *Topology) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -3355,6 +3401,16 @@ func (m *SetCoordinatorMessage) Size() (n int) {
 	return n
 }
 
+func (m *UpdateCoordinatorMessage) Size() (n int) {
+	var l int
+	_ = l
+	if m.New != nil {
+		l = m.New.Size()
+		n += 1 + l + sovPrivate(uint64(l))
+	}
+	return n
+}
+
 func (m *Topology) Size() (n int) {
 	var l int
 	_ = l
@@ -8262,6 +8318,89 @@ func (m *SetCoordinatorMessage) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *UpdateCoordinatorMessage) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowPrivate
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: UpdateCoordinatorMessage: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: UpdateCoordinatorMessage: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field New", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPrivate
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.New == nil {
+				m.New = &Node{}
+			}
+			if err := m.New.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipPrivate(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthPrivate
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *Topology) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
@@ -8528,88 +8667,89 @@ var (
 func init() { proto.RegisterFile("private.proto", fileDescriptorPrivate) }
 
 var fileDescriptorPrivate = []byte{
-	// 1325 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xac, 0x57, 0x4f, 0x6f, 0x1b, 0x45,
-	0x14, 0x67, 0xbd, 0xb6, 0x13, 0xbf, 0xd4, 0xa9, 0x33, 0x6d, 0x83, 0x5b, 0x45, 0xae, 0x19, 0x15,
-	0x1a, 0x2a, 0x11, 0x95, 0x54, 0x42, 0xb4, 0xa8, 0x52, 0xa9, 0xed, 0xaa, 0x0b, 0x4d, 0x29, 0xe3,
-	0xb6, 0x48, 0x48, 0x20, 0x4d, 0xec, 0x21, 0x5d, 0x65, 0xbd, 0x6b, 0x76, 0xc7, 0x49, 0xdc, 0x03,
-	0x47, 0x84, 0x84, 0xb8, 0x23, 0xae, 0x7c, 0x19, 0x8e, 0x7c, 0x04, 0x54, 0x3e, 0x04, 0x12, 0x17,
-	0xd0, 0xbc, 0x99, 0xd9, 0x5d, 0xff, 0x4b, 0x9a, 0xc0, 0x6d, 0xdf, 0x6f, 0xde, 0x7b, 0xf3, 0x9b,
-	0xf7, 0x6f, 0x66, 0xa1, 0x3a, 0x8c, 0xfd, 0x03, 0x2e, 0xc5, 0xd6, 0x30, 0x8e, 0x64, 0x44, 0x96,
-	0xfd, 0x50, 0x8a, 0x38, 0xe4, 0x01, 0xfd, 0x0c, 0x2a, 0x5e, 0xd8, 0x17, 0x47, 0x3b, 0x42, 0x72,
-	0xd2, 0x84, 0x95, 0x56, 0x14, 0x8c, 0x06, 0xe1, 0x23, 0xbe, 0x2b, 0x82, 0xba, 0xd3, 0x74, 0x36,
-	0x2b, 0x2c, 0x0f, 0x29, 0x8d, 0xa7, 0xfe, 0x40, 0x7c, 0x3e, 0xe2, 0xa1, 0x1c, 0x0d, 0xea, 0x05,
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-	0xd1, 0x61, 0xde, 0x5d, 0x2a, 0x93, 0x77, 0x60, 0xd5, 0x0b, 0x0f, 0x44, 0x9c, 0x88, 0x4e, 0xc8,
-	0x77, 0x03, 0xd1, 0x47, 0x77, 0xcb, 0x6c, 0x0a, 0x25, 0x1b, 0x50, 0x69, 0xf1, 0xde, 0x0b, 0xf1,
-	0x74, 0x3c, 0x14, 0x75, 0x17, 0x9d, 0x64, 0x40, 0xba, 0xda, 0xf5, 0x5f, 0x8a, 0x7a, 0xb1, 0xe9,
-	0x6c, 0x56, 0x59, 0x06, 0x4c, 0xf3, 0x2d, 0xcd, 0xf0, 0x25, 0x14, 0xce, 0x31, 0x1e, 0xee, 0xa5,
-	0x1c, 0xca, 0xc8, 0x61, 0x02, 0x23, 0xd7, 0xa1, 0xfc, 0xc0, 0x17, 0x41, 0x3f, 0xa9, 0x2f, 0x35,
-	0xdd, 0xcd, 0x95, 0xed, 0xf3, 0x5b, 0x36, 0x7e, 0x5b, 0x88, 0x33, 0xb3, 0x4c, 0x29, 0xac, 0x7a,
-	0x83, 0x61, 0x14, 0x4b, 0x26, 0x92, 0x61, 0x14, 0x26, 0x82, 0xd4, 0xc0, 0xed, 0xc4, 0xb1, 0x39,
-	0xbb, 0xfa, 0xa4, 0xdf, 0x41, 0xed, 0x7e, 0x10, 0xf5, 0xf6, 0xdb, 0x5c, 0x72, 0x26, 0xbe, 0x1d,
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+	0x9a, 0x14, 0x69, 0x49, 0x98, 0x3c, 0x0b, 0x22, 0x6e, 0x4c, 0xc4, 0xb7, 0xc0, 0x5e, 0x04, 0x21,
+	0x97, 0x8c, 0xcb, 0x44, 0x7e, 0xe3, 0x2f, 0x21, 0xbb, 0x17, 0x74, 0x19, 0x5a, 0x80, 0x8c, 0xd3,
+	0xd4, 0x3e, 0x32, 0x4e, 0x13, 0xdd, 0x91, 0xee, 0xf5, 0x0c, 0x29, 0x27, 0x87, 0x3b, 0x20, 0x0e,
+	0x91, 0x1b, 0xdf, 0x85, 0xb2, 0x13, 0x35, 0x82, 0x20, 0xec, 0x8a, 0x54, 0x07, 0xa1, 0xbe, 0x93,
+	0x46, 0x41, 0xfc, 0x04, 0x2a, 0xc2, 0x7d, 0x9b, 0x53, 0x1e, 0x4f, 0xea, 0x15, 0xc8, 0x0b, 0x2c,
+	0xde, 0x4e, 0x4b, 0xf2, 0xde, 0x13, 0x7a, 0x66, 0x00, 0x4a, 0x01, 0x3f, 0x57, 0x1e, 0x5a, 0xa7,
+	0xcc, 0xe7, 0xa9, 0x28, 0x49, 0x59, 0x3a, 0x28, 0x13, 0x25, 0x20, 0xac, 0x8e, 0xa2, 0x39, 0x2f,
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+	0x64, 0xe5, 0x8b, 0x5a, 0x97, 0x8b, 0x7c, 0x4c, 0x57, 0xc0, 0xde, 0x75, 0x55, 0x7d, 0xdb, 0x44,
+	0x7c, 0x4a, 0x84, 0x9e, 0xcb, 0xfe, 0x13, 0x08, 0x15, 0x6f, 0x89, 0x25, 0xd5, 0x40, 0xe2, 0xee,
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+	0xd5, 0x3f, 0xa9, 0x9a, 0x56, 0x41, 0x0f, 0x60, 0xae, 0x1d, 0x0c, 0xc2, 0x4e, 0x7c, 0x0d, 0xae,
+	0x24, 0xda, 0x8a, 0x99, 0x5a, 0x26, 0x46, 0x2d, 0x55, 0x47, 0xb9, 0xcb, 0xeb, 0x08, 0x3d, 0x1e,
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+	0x16, 0xcc, 0xa7, 0x29, 0xbc, 0x56, 0x63, 0xc4, 0x19, 0xc9, 0x4c, 0xcd, 0x88, 0x3d, 0x2d, 0x23,
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+	0xe8, 0xf5, 0x45, 0x3d, 0xfc, 0x8b, 0x74, 0x89, 0x91, 0x11, 0x86, 0x3a, 0x51, 0x45, 0xa2, 0x04,
+	0xfc, 0x08, 0x6e, 0xb7, 0x19, 0x4f, 0x25, 0xc9, 0x54, 0x5b, 0x1d, 0xec, 0x3d, 0x76, 0x36, 0xe3,
+	0xf8, 0x62, 0x09, 0x7f, 0x08, 0xd5, 0x83, 0x7e, 0x97, 0x72, 0x76, 0x23, 0xeb, 0x1d, 0x28, 0xec,
+	0x07, 0xfd, 0xc0, 0x0b, 0x8e, 0x87, 0x57, 0xb4, 0x7c, 0x15, 0xe6, 0xd4, 0x7c, 0x54, 0x8f, 0x94,
+	0x22, 0x31, 0x22, 0xbe, 0x25, 0x0a, 0xba, 0x43, 0xbd, 0xce, 0xc0, 0x13, 0x34, 0xc4, 0xbf, 0x57,
+	0xb4, 0x53, 0xf9, 0xf5, 0xa2, 0x66, 0xfd, 0x76, 0x51, 0xb3, 0x7e, 0xbf, 0xa8, 0x59, 0x3f, 0xfd,
+	0x51, 0xfb, 0xdf, 0x51, 0x5e, 0xfe, 0xe5, 0x3f, 0xfc, 0x27, 0x00, 0x00, 0xff, 0xff, 0x66, 0x19,
+	0x3d, 0xd2, 0xf6, 0x0f, 0x00, 0x00,
 }
diff --git a/internal/private.proto b/internal/private.proto
index 5755ce2f6..8642d9a13 100644
--- a/internal/private.proto
+++ b/internal/private.proto
@@ -207,6 +207,10 @@ message SetCoordinatorMessage {
     Node New = 1;
 }
 
+message UpdateCoordinatorMessage {
+    Node New = 1;
+}
+
 message Topology {
     string ClusterID = 1;
     repeated string NodeIDs = 2;
diff --git a/server.go b/server.go
index c52c28cbd..531609278 100644
--- a/server.go
+++ b/server.go
@@ -456,6 +456,8 @@ func (s *Server) ReceiveMessage(pb proto.Message) error {
 		}
 	case *internal.SetCoordinatorMessage:
 		s.Cluster.SetCoordinator(DecodeNode(obj.New))
+	case *internal.UpdateCoordinatorMessage:
+		s.Cluster.UpdateCoordinator(DecodeNode(obj.New))
 	case *internal.NodeStateMessage:
 		err := s.Cluster.ReceiveNodeState(obj.NodeID, obj.State)
 		if err != nil {