diff --git a/vendor/go.etcd.io/etcd/raft/raftpb/confchange.go b/vendor/go.etcd.io/etcd/raft/raftpb/confchange.go
new file mode 100644
index 0000000..46a7a70
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/raft/raftpb/confchange.go
@@ -0,0 +1,170 @@
+// Copyright 2019 The etcd Authors
+//
+// 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 raftpb
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/gogo/protobuf/proto"
+)
+
+// ConfChangeI abstracts over ConfChangeV2 and (legacy) ConfChange to allow
+// treating them in a unified manner.
+type ConfChangeI interface {
+	AsV2() ConfChangeV2
+	AsV1() (ConfChange, bool)
+}
+
+// MarshalConfChange calls Marshal on the underlying ConfChange or ConfChangeV2
+// and returns the result along with the corresponding EntryType.
+func MarshalConfChange(c ConfChangeI) (EntryType, []byte, error) {
+	var typ EntryType
+	var ccdata []byte
+	var err error
+	if ccv1, ok := c.AsV1(); ok {
+		typ = EntryConfChange
+		ccdata, err = ccv1.Marshal()
+	} else {
+		ccv2 := c.AsV2()
+		typ = EntryConfChangeV2
+		ccdata, err = ccv2.Marshal()
+	}
+	return typ, ccdata, err
+}
+
+// AsV2 returns a V2 configuration change carrying out the same operation.
+func (c ConfChange) AsV2() ConfChangeV2 {
+	return ConfChangeV2{
+		Changes: []ConfChangeSingle{{
+			Type:   c.Type,
+			NodeID: c.NodeID,
+		}},
+		Context: c.Context,
+	}
+}
+
+// AsV1 returns the ConfChange and true.
+func (c ConfChange) AsV1() (ConfChange, bool) {
+	return c, true
+}
+
+// AsV2 is the identity.
+func (c ConfChangeV2) AsV2() ConfChangeV2 { return c }
+
+// AsV1 returns ConfChange{} and false.
+func (c ConfChangeV2) AsV1() (ConfChange, bool) { return ConfChange{}, false }
+
+// EnterJoint returns two bools. The second bool is true if and only if this
+// config change will use Joint Consensus, which is the case if it contains more
+// than one change or if the use of Joint Consensus was requested explicitly.
+// The first bool can only be true if second one is, and indicates whether the
+// Joint State will be left automatically.
+func (c *ConfChangeV2) EnterJoint() (autoLeave bool, ok bool) {
+	// NB: in theory, more config changes could qualify for the "simple"
+	// protocol but it depends on the config on top of which the changes apply.
+	// For example, adding two learners is not OK if both nodes are part of the
+	// base config (i.e. two voters are turned into learners in the process of
+	// applying the conf change). In practice, these distinctions should not
+	// matter, so we keep it simple and use Joint Consensus liberally.
+	if c.Transition != ConfChangeTransitionAuto || len(c.Changes) > 1 {
+		// Use Joint Consensus.
+		var autoLeave bool
+		switch c.Transition {
+		case ConfChangeTransitionAuto:
+			autoLeave = true
+		case ConfChangeTransitionJointImplicit:
+			autoLeave = true
+		case ConfChangeTransitionJointExplicit:
+		default:
+			panic(fmt.Sprintf("unknown transition: %+v", c))
+		}
+		return autoLeave, true
+	}
+	return false, false
+}
+
+// LeaveJoint is true if the configuration change leaves a joint configuration.
+// This is the case if the ConfChangeV2 is zero, with the possible exception of
+// the Context field.
+func (c *ConfChangeV2) LeaveJoint() bool {
+	cpy := *c
+	cpy.Context = nil
+	return proto.Equal(&cpy, &ConfChangeV2{})
+}
+
+// ConfChangesFromString parses a Space-delimited sequence of operations into a
+// slice of ConfChangeSingle. The supported operations are:
+// - vn: make n a voter,
+// - ln: make n a learner,
+// - rn: remove n, and
+// - un: update n.
+func ConfChangesFromString(s string) ([]ConfChangeSingle, error) {
+	var ccs []ConfChangeSingle
+	toks := strings.Split(strings.TrimSpace(s), " ")
+	if toks[0] == "" {
+		toks = nil
+	}
+	for _, tok := range toks {
+		if len(tok) < 2 {
+			return nil, fmt.Errorf("unknown token %s", tok)
+		}
+		var cc ConfChangeSingle
+		switch tok[0] {
+		case 'v':
+			cc.Type = ConfChangeAddNode
+		case 'l':
+			cc.Type = ConfChangeAddLearnerNode
+		case 'r':
+			cc.Type = ConfChangeRemoveNode
+		case 'u':
+			cc.Type = ConfChangeUpdateNode
+		default:
+			return nil, fmt.Errorf("unknown input: %s", tok)
+		}
+		id, err := strconv.ParseUint(tok[1:], 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		cc.NodeID = id
+		ccs = append(ccs, cc)
+	}
+	return ccs, nil
+}
+
+// ConfChangesToString is the inverse to ConfChangesFromString.
+func ConfChangesToString(ccs []ConfChangeSingle) string {
+	var buf strings.Builder
+	for i, cc := range ccs {
+		if i > 0 {
+			buf.WriteByte(' ')
+		}
+		switch cc.Type {
+		case ConfChangeAddNode:
+			buf.WriteByte('v')
+		case ConfChangeAddLearnerNode:
+			buf.WriteByte('l')
+		case ConfChangeRemoveNode:
+			buf.WriteByte('r')
+		case ConfChangeUpdateNode:
+			buf.WriteByte('u')
+		default:
+			buf.WriteString("unknown")
+		}
+		fmt.Fprintf(&buf, "%d", cc.NodeID)
+	}
+	return buf.String()
+}
diff --git a/vendor/go.etcd.io/etcd/raft/raftpb/confstate.go b/vendor/go.etcd.io/etcd/raft/raftpb/confstate.go
new file mode 100644
index 0000000..4bda932
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/raft/raftpb/confstate.go
@@ -0,0 +1,45 @@
+// Copyright 2019 The etcd Authors
+//
+// 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 raftpb
+
+import (
+	"fmt"
+	"reflect"
+	"sort"
+)
+
+// Equivalent returns a nil error if the inputs describe the same configuration.
+// On mismatch, returns a descriptive error showing the differences.
+func (cs ConfState) Equivalent(cs2 ConfState) error {
+	cs1 := cs
+	orig1, orig2 := cs1, cs2
+	s := func(sl *[]uint64) {
+		*sl = append([]uint64(nil), *sl...)
+		sort.Slice(*sl, func(i, j int) bool { return (*sl)[i] < (*sl)[j] })
+	}
+
+	for _, cs := range []*ConfState{&cs1, &cs2} {
+		s(&cs.Voters)
+		s(&cs.Learners)
+		s(&cs.VotersOutgoing)
+		s(&cs.LearnersNext)
+		cs.XXX_unrecognized = nil
+	}
+
+	if !reflect.DeepEqual(cs1, cs2) {
+		return fmt.Errorf("ConfStates not equivalent after sorting:\n%+#v\n%+#v\nInputs were:\n%+#v\n%+#v", cs1, cs2, orig1, orig2)
+	}
+	return nil
+}
diff --git a/vendor/go.etcd.io/etcd/raft/raftpb/raft.pb.go b/vendor/go.etcd.io/etcd/raft/raftpb/raft.pb.go
index fd9ee37..fcf259c 100644
--- a/vendor/go.etcd.io/etcd/raft/raftpb/raft.pb.go
+++ b/vendor/go.etcd.io/etcd/raft/raftpb/raft.pb.go
@@ -15,6 +15,8 @@
 		HardState
 		ConfState
 		ConfChange
+		ConfChangeSingle
+		ConfChangeV2
 */
 package raftpb
 
@@ -44,17 +46,20 @@
 type EntryType int32
 
 const (
-	EntryNormal     EntryType = 0
-	EntryConfChange EntryType = 1
+	EntryNormal       EntryType = 0
+	EntryConfChange   EntryType = 1
+	EntryConfChangeV2 EntryType = 2
 )
 
 var EntryType_name = map[int32]string{
 	0: "EntryNormal",
 	1: "EntryConfChange",
+	2: "EntryConfChangeV2",
 }
 var EntryType_value = map[string]int32{
-	"EntryNormal":     0,
-	"EntryConfChange": 1,
+	"EntryNormal":       0,
+	"EntryConfChange":   1,
+	"EntryConfChangeV2": 2,
 }
 
 func (x EntryType) Enum() *EntryType {
@@ -160,6 +165,57 @@
 }
 func (MessageType) EnumDescriptor() ([]byte, []int) { return fileDescriptorRaft, []int{1} }
 
+// ConfChangeTransition specifies the behavior of a configuration change with
+// respect to joint consensus.
+type ConfChangeTransition int32
+
+const (
+	// Automatically use the simple protocol if possible, otherwise fall back
+	// to ConfChangeJointImplicit. Most applications will want to use this.
+	ConfChangeTransitionAuto ConfChangeTransition = 0
+	// Use joint consensus unconditionally, and transition out of them
+	// automatically (by proposing a zero configuration change).
+	//
+	// This option is suitable for applications that want to minimize the time
+	// spent in the joint configuration and do not store the joint configuration
+	// in the state machine (outside of InitialState).
+	ConfChangeTransitionJointImplicit ConfChangeTransition = 1
+	// Use joint consensus and remain in the joint configuration until the
+	// application proposes a no-op configuration change. This is suitable for
+	// applications that want to explicitly control the transitions, for example
+	// to use a custom payload (via the Context field).
+	ConfChangeTransitionJointExplicit ConfChangeTransition = 2
+)
+
+var ConfChangeTransition_name = map[int32]string{
+	0: "ConfChangeTransitionAuto",
+	1: "ConfChangeTransitionJointImplicit",
+	2: "ConfChangeTransitionJointExplicit",
+}
+var ConfChangeTransition_value = map[string]int32{
+	"ConfChangeTransitionAuto":          0,
+	"ConfChangeTransitionJointImplicit": 1,
+	"ConfChangeTransitionJointExplicit": 2,
+}
+
+func (x ConfChangeTransition) Enum() *ConfChangeTransition {
+	p := new(ConfChangeTransition)
+	*p = x
+	return p
+}
+func (x ConfChangeTransition) String() string {
+	return proto.EnumName(ConfChangeTransition_name, int32(x))
+}
+func (x *ConfChangeTransition) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(ConfChangeTransition_value, data, "ConfChangeTransition")
+	if err != nil {
+		return err
+	}
+	*x = ConfChangeTransition(value)
+	return nil
+}
+func (ConfChangeTransition) EnumDescriptor() ([]byte, []int) { return fileDescriptorRaft, []int{2} }
+
 type ConfChangeType int32
 
 const (
@@ -198,7 +254,7 @@
 	*x = ConfChangeType(value)
 	return nil
 }
-func (ConfChangeType) EnumDescriptor() ([]byte, []int) { return fileDescriptorRaft, []int{2} }
+func (ConfChangeType) EnumDescriptor() ([]byte, []int) { return fileDescriptorRaft, []int{3} }
 
 type Entry struct {
 	Term             uint64    `protobuf:"varint,2,opt,name=Term" json:"Term"`
@@ -270,9 +326,21 @@
 func (*HardState) Descriptor() ([]byte, []int) { return fileDescriptorRaft, []int{4} }
 
 type ConfState struct {
-	Nodes            []uint64 `protobuf:"varint,1,rep,name=nodes" json:"nodes,omitempty"`
-	Learners         []uint64 `protobuf:"varint,2,rep,name=learners" json:"learners,omitempty"`
-	XXX_unrecognized []byte   `json:"-"`
+	// The voters in the incoming config. (If the configuration is not joint,
+	// then the outgoing config is empty).
+	Voters []uint64 `protobuf:"varint,1,rep,name=voters" json:"voters,omitempty"`
+	// The learners in the incoming config.
+	Learners []uint64 `protobuf:"varint,2,rep,name=learners" json:"learners,omitempty"`
+	// The voters in the outgoing config.
+	VotersOutgoing []uint64 `protobuf:"varint,3,rep,name=voters_outgoing,json=votersOutgoing" json:"voters_outgoing,omitempty"`
+	// The nodes that will become learners when the outgoing config is removed.
+	// These nodes are necessarily currently in nodes_joint (or they would have
+	// been added to the incoming config right away).
+	LearnersNext []uint64 `protobuf:"varint,4,rep,name=learners_next,json=learnersNext" json:"learners_next,omitempty"`
+	// If set, the config is joint and Raft will automatically transition into
+	// the final config (i.e. remove the outgoing config) when this is safe.
+	AutoLeave        bool   `protobuf:"varint,5,opt,name=auto_leave,json=autoLeave" json:"auto_leave"`
+	XXX_unrecognized []byte `json:"-"`
 }
 
 func (m *ConfState) Reset()                    { *m = ConfState{} }
@@ -281,11 +349,14 @@
 func (*ConfState) Descriptor() ([]byte, []int) { return fileDescriptorRaft, []int{5} }
 
 type ConfChange struct {
-	ID               uint64         `protobuf:"varint,1,opt,name=ID" json:"ID"`
-	Type             ConfChangeType `protobuf:"varint,2,opt,name=Type,enum=raftpb.ConfChangeType" json:"Type"`
-	NodeID           uint64         `protobuf:"varint,3,opt,name=NodeID" json:"NodeID"`
-	Context          []byte         `protobuf:"bytes,4,opt,name=Context" json:"Context,omitempty"`
-	XXX_unrecognized []byte         `json:"-"`
+	Type    ConfChangeType `protobuf:"varint,2,opt,name=type,enum=raftpb.ConfChangeType" json:"type"`
+	NodeID  uint64         `protobuf:"varint,3,opt,name=node_id,json=nodeId" json:"node_id"`
+	Context []byte         `protobuf:"bytes,4,opt,name=context" json:"context,omitempty"`
+	// NB: this is used only by etcd to thread through a unique identifier.
+	// Ideally it should really use the Context instead. No counterpart to
+	// this field exists in ConfChangeV2.
+	ID               uint64 `protobuf:"varint,1,opt,name=id" json:"id"`
+	XXX_unrecognized []byte `json:"-"`
 }
 
 func (m *ConfChange) Reset()                    { *m = ConfChange{} }
@@ -293,6 +364,63 @@
 func (*ConfChange) ProtoMessage()               {}
 func (*ConfChange) Descriptor() ([]byte, []int) { return fileDescriptorRaft, []int{6} }
 
+// ConfChangeSingle is an individual configuration change operation. Multiple
+// such operations can be carried out atomically via a ConfChangeV2.
+type ConfChangeSingle struct {
+	Type             ConfChangeType `protobuf:"varint,1,opt,name=type,enum=raftpb.ConfChangeType" json:"type"`
+	NodeID           uint64         `protobuf:"varint,2,opt,name=node_id,json=nodeId" json:"node_id"`
+	XXX_unrecognized []byte         `json:"-"`
+}
+
+func (m *ConfChangeSingle) Reset()                    { *m = ConfChangeSingle{} }
+func (m *ConfChangeSingle) String() string            { return proto.CompactTextString(m) }
+func (*ConfChangeSingle) ProtoMessage()               {}
+func (*ConfChangeSingle) Descriptor() ([]byte, []int) { return fileDescriptorRaft, []int{7} }
+
+// ConfChangeV2 messages initiate configuration changes. They support both the
+// simple "one at a time" membership change protocol and full Joint Consensus
+// allowing for arbitrary changes in membership.
+//
+// The supplied context is treated as an opaque payload and can be used to
+// attach an action on the state machine to the application of the config change
+// proposal. Note that contrary to Joint Consensus as outlined in the Raft
+// paper[1], configuration changes become active when they are *applied* to the
+// state machine (not when they are appended to the log).
+//
+// The simple protocol can be used whenever only a single change is made.
+//
+// Non-simple changes require the use of Joint Consensus, for which two
+// configuration changes are run. The first configuration change specifies the
+// desired changes and transitions the Raft group into the joint configuration,
+// in which quorum requires a majority of both the pre-changes and post-changes
+// configuration. Joint Consensus avoids entering fragile intermediate
+// configurations that could compromise survivability. For example, without the
+// use of Joint Consensus and running across three availability zones with a
+// replication factor of three, it is not possible to replace a voter without
+// entering an intermediate configuration that does not survive the outage of
+// one availability zone.
+//
+// The provided ConfChangeTransition specifies how (and whether) Joint Consensus
+// is used, and assigns the task of leaving the joint configuration either to
+// Raft or the application. Leaving the joint configuration is accomplished by
+// proposing a ConfChangeV2 with only and optionally the Context field
+// populated.
+//
+// For details on Raft membership changes, see:
+//
+// [1]: https://github.com/ongardie/dissertation/blob/master/online-trim.pdf
+type ConfChangeV2 struct {
+	Transition       ConfChangeTransition `protobuf:"varint,1,opt,name=transition,enum=raftpb.ConfChangeTransition" json:"transition"`
+	Changes          []ConfChangeSingle   `protobuf:"bytes,2,rep,name=changes" json:"changes"`
+	Context          []byte               `protobuf:"bytes,3,opt,name=context" json:"context,omitempty"`
+	XXX_unrecognized []byte               `json:"-"`
+}
+
+func (m *ConfChangeV2) Reset()                    { *m = ConfChangeV2{} }
+func (m *ConfChangeV2) String() string            { return proto.CompactTextString(m) }
+func (*ConfChangeV2) ProtoMessage()               {}
+func (*ConfChangeV2) Descriptor() ([]byte, []int) { return fileDescriptorRaft, []int{8} }
+
 func init() {
 	proto.RegisterType((*Entry)(nil), "raftpb.Entry")
 	proto.RegisterType((*SnapshotMetadata)(nil), "raftpb.SnapshotMetadata")
@@ -301,8 +429,11 @@
 	proto.RegisterType((*HardState)(nil), "raftpb.HardState")
 	proto.RegisterType((*ConfState)(nil), "raftpb.ConfState")
 	proto.RegisterType((*ConfChange)(nil), "raftpb.ConfChange")
+	proto.RegisterType((*ConfChangeSingle)(nil), "raftpb.ConfChangeSingle")
+	proto.RegisterType((*ConfChangeV2)(nil), "raftpb.ConfChangeV2")
 	proto.RegisterEnum("raftpb.EntryType", EntryType_name, EntryType_value)
 	proto.RegisterEnum("raftpb.MessageType", MessageType_name, MessageType_value)
+	proto.RegisterEnum("raftpb.ConfChangeTransition", ConfChangeTransition_name, ConfChangeTransition_value)
 	proto.RegisterEnum("raftpb.ConfChangeType", ConfChangeType_name, ConfChangeType_value)
 }
 func (m *Entry) Marshal() (dAtA []byte, err error) {
@@ -535,8 +666,8 @@
 	_ = i
 	var l int
 	_ = l
-	if len(m.Nodes) > 0 {
-		for _, num := range m.Nodes {
+	if len(m.Voters) > 0 {
+		for _, num := range m.Voters {
 			dAtA[i] = 0x8
 			i++
 			i = encodeVarintRaft(dAtA, i, uint64(num))
@@ -549,6 +680,28 @@
 			i = encodeVarintRaft(dAtA, i, uint64(num))
 		}
 	}
+	if len(m.VotersOutgoing) > 0 {
+		for _, num := range m.VotersOutgoing {
+			dAtA[i] = 0x18
+			i++
+			i = encodeVarintRaft(dAtA, i, uint64(num))
+		}
+	}
+	if len(m.LearnersNext) > 0 {
+		for _, num := range m.LearnersNext {
+			dAtA[i] = 0x20
+			i++
+			i = encodeVarintRaft(dAtA, i, uint64(num))
+		}
+	}
+	dAtA[i] = 0x28
+	i++
+	if m.AutoLeave {
+		dAtA[i] = 1
+	} else {
+		dAtA[i] = 0
+	}
+	i++
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -591,6 +744,75 @@
 	return i, nil
 }
 
+func (m *ConfChangeSingle) 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 *ConfChangeSingle) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	dAtA[i] = 0x8
+	i++
+	i = encodeVarintRaft(dAtA, i, uint64(m.Type))
+	dAtA[i] = 0x10
+	i++
+	i = encodeVarintRaft(dAtA, i, uint64(m.NodeID))
+	if m.XXX_unrecognized != nil {
+		i += copy(dAtA[i:], m.XXX_unrecognized)
+	}
+	return i, nil
+}
+
+func (m *ConfChangeV2) 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 *ConfChangeV2) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	dAtA[i] = 0x8
+	i++
+	i = encodeVarintRaft(dAtA, i, uint64(m.Transition))
+	if len(m.Changes) > 0 {
+		for _, msg := range m.Changes {
+			dAtA[i] = 0x12
+			i++
+			i = encodeVarintRaft(dAtA, i, uint64(msg.Size()))
+			n, err := msg.MarshalTo(dAtA[i:])
+			if err != nil {
+				return 0, err
+			}
+			i += n
+		}
+	}
+	if m.Context != nil {
+		dAtA[i] = 0x1a
+		i++
+		i = encodeVarintRaft(dAtA, i, uint64(len(m.Context)))
+		i += copy(dAtA[i:], m.Context)
+	}
+	if m.XXX_unrecognized != nil {
+		i += copy(dAtA[i:], m.XXX_unrecognized)
+	}
+	return i, nil
+}
+
 func encodeVarintRaft(dAtA []byte, offset int, v uint64) int {
 	for v >= 1<<7 {
 		dAtA[offset] = uint8(v&0x7f | 0x80)
@@ -689,8 +911,8 @@
 func (m *ConfState) Size() (n int) {
 	var l int
 	_ = l
-	if len(m.Nodes) > 0 {
-		for _, e := range m.Nodes {
+	if len(m.Voters) > 0 {
+		for _, e := range m.Voters {
 			n += 1 + sovRaft(uint64(e))
 		}
 	}
@@ -699,6 +921,17 @@
 			n += 1 + sovRaft(uint64(e))
 		}
 	}
+	if len(m.VotersOutgoing) > 0 {
+		for _, e := range m.VotersOutgoing {
+			n += 1 + sovRaft(uint64(e))
+		}
+	}
+	if len(m.LearnersNext) > 0 {
+		for _, e := range m.LearnersNext {
+			n += 1 + sovRaft(uint64(e))
+		}
+	}
+	n += 2
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -721,6 +954,37 @@
 	return n
 }
 
+func (m *ConfChangeSingle) Size() (n int) {
+	var l int
+	_ = l
+	n += 1 + sovRaft(uint64(m.Type))
+	n += 1 + sovRaft(uint64(m.NodeID))
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
+func (m *ConfChangeV2) Size() (n int) {
+	var l int
+	_ = l
+	n += 1 + sovRaft(uint64(m.Transition))
+	if len(m.Changes) > 0 {
+		for _, e := range m.Changes {
+			l = e.Size()
+			n += 1 + l + sovRaft(uint64(l))
+		}
+	}
+	if m.Context != nil {
+		l = len(m.Context)
+		n += 1 + l + sovRaft(uint64(l))
+	}
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
 func sovRaft(x uint64) (n int) {
 	for {
 		n++
@@ -1573,7 +1837,7 @@
 						break
 					}
 				}
-				m.Nodes = append(m.Nodes, v)
+				m.Voters = append(m.Voters, v)
 			} else if wireType == 2 {
 				var packedLen int
 				for shift := uint(0); ; shift += 7 {
@@ -1613,10 +1877,10 @@
 							break
 						}
 					}
-					m.Nodes = append(m.Nodes, v)
+					m.Voters = append(m.Voters, v)
 				}
 			} else {
-				return fmt.Errorf("proto: wrong wireType = %d for field Nodes", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field Voters", wireType)
 			}
 		case 2:
 			if wireType == 0 {
@@ -1680,6 +1944,150 @@
 			} else {
 				return fmt.Errorf("proto: wrong wireType = %d for field Learners", wireType)
 			}
+		case 3:
+			if wireType == 0 {
+				var v uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowRaft
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					v |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				m.VotersOutgoing = append(m.VotersOutgoing, v)
+			} else if wireType == 2 {
+				var packedLen int
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowRaft
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					packedLen |= (int(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				if packedLen < 0 {
+					return ErrInvalidLengthRaft
+				}
+				postIndex := iNdEx + packedLen
+				if postIndex > l {
+					return io.ErrUnexpectedEOF
+				}
+				for iNdEx < postIndex {
+					var v uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowRaft
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						v |= (uint64(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					m.VotersOutgoing = append(m.VotersOutgoing, v)
+				}
+			} else {
+				return fmt.Errorf("proto: wrong wireType = %d for field VotersOutgoing", wireType)
+			}
+		case 4:
+			if wireType == 0 {
+				var v uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowRaft
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					v |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				m.LearnersNext = append(m.LearnersNext, v)
+			} else if wireType == 2 {
+				var packedLen int
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowRaft
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					packedLen |= (int(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				if packedLen < 0 {
+					return ErrInvalidLengthRaft
+				}
+				postIndex := iNdEx + packedLen
+				if postIndex > l {
+					return io.ErrUnexpectedEOF
+				}
+				for iNdEx < postIndex {
+					var v uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowRaft
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						v |= (uint64(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					m.LearnersNext = append(m.LearnersNext, v)
+				}
+			} else {
+				return fmt.Errorf("proto: wrong wireType = %d for field LearnersNext", wireType)
+			}
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field AutoLeave", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.AutoLeave = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRaft(dAtA[iNdEx:])
@@ -1841,6 +2249,227 @@
 	}
 	return nil
 }
+func (m *ConfChangeSingle) 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 ErrIntOverflowRaft
+			}
+			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: ConfChangeSingle: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ConfChangeSingle: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Type", wireType)
+			}
+			m.Type = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Type |= (ConfChangeType(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field NodeID", wireType)
+			}
+			m.NodeID = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.NodeID |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipRaft(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthRaft
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.XXX_unrecognized = append(m.XXX_unrecognized, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *ConfChangeV2) 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 ErrIntOverflowRaft
+			}
+			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: ConfChangeV2: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ConfChangeV2: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Transition", wireType)
+			}
+			m.Transition = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Transition |= (ConfChangeTransition(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Changes", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthRaft
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Changes = append(m.Changes, ConfChangeSingle{})
+			if err := m.Changes[len(m.Changes)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Context", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthRaft
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Context = append(m.Context[:0], dAtA[iNdEx:postIndex]...)
+			if m.Context == nil {
+				m.Context = []byte{}
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipRaft(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthRaft
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.XXX_unrecognized = append(m.XXX_unrecognized, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipRaft(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
@@ -1949,56 +2578,69 @@
 func init() { proto.RegisterFile("raft.proto", fileDescriptorRaft) }
 
 var fileDescriptorRaft = []byte{
-	// 815 bytes of a gzipped FileDescriptorProto
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+	// 1009 bytes of a gzipped FileDescriptorProto
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 }
diff --git a/vendor/go.etcd.io/etcd/raft/raftpb/raft.proto b/vendor/go.etcd.io/etcd/raft/raftpb/raft.proto
index 644ce7b..23d62ec 100644
--- a/vendor/go.etcd.io/etcd/raft/raftpb/raft.proto
+++ b/vendor/go.etcd.io/etcd/raft/raftpb/raft.proto
@@ -10,8 +10,9 @@
 option (gogoproto.goproto_enum_prefix_all) = false;
 
 enum EntryType {
-	EntryNormal     = 0;
-	EntryConfChange = 1;
+	EntryNormal       = 0;
+	EntryConfChange   = 1; // corresponds to pb.ConfChange
+	EntryConfChangeV2 = 2; // corresponds to pb.ConfChangeV2
 }
 
 message Entry {
@@ -75,9 +76,41 @@
 	optional uint64 commit = 3 [(gogoproto.nullable) = false];
 }
 
+// ConfChangeTransition specifies the behavior of a configuration change with
+// respect to joint consensus.
+enum ConfChangeTransition {
+	// Automatically use the simple protocol if possible, otherwise fall back
+	// to ConfChangeJointImplicit. Most applications will want to use this.
+	ConfChangeTransitionAuto          = 0;
+	// Use joint consensus unconditionally, and transition out of them
+	// automatically (by proposing a zero configuration change).
+	//
+	// This option is suitable for applications that want to minimize the time
+	// spent in the joint configuration and do not store the joint configuration
+	// in the state machine (outside of InitialState).
+	ConfChangeTransitionJointImplicit = 1;
+	// Use joint consensus and remain in the joint configuration until the
+	// application proposes a no-op configuration change. This is suitable for
+	// applications that want to explicitly control the transitions, for example
+	// to use a custom payload (via the Context field).
+	ConfChangeTransitionJointExplicit = 2;
+}
+
 message ConfState {
-	repeated uint64 nodes    = 1;
-	repeated uint64 learners = 2;
+	// The voters in the incoming config. (If the configuration is not joint,
+	// then the outgoing config is empty).
+	repeated uint64 voters = 1;
+	// The learners in the incoming config.
+	repeated uint64 learners          = 2;
+	// The voters in the outgoing config.
+	repeated uint64 voters_outgoing   = 3;
+	// The nodes that will become learners when the outgoing config is removed.
+	// These nodes are necessarily currently in nodes_joint (or they would have
+	// been added to the incoming config right away).
+	repeated uint64 learners_next     = 4;
+	// If set, the config is joint and Raft will automatically transition into
+	// the final config (i.e. remove the outgoing config) when this is safe.
+	optional bool   auto_leave        = 5 [(gogoproto.nullable) = false];
 }
 
 enum ConfChangeType {
@@ -88,8 +121,57 @@
 }
 
 message ConfChange {
-	optional uint64          ID      = 1 [(gogoproto.nullable) = false];
-	optional ConfChangeType  Type    = 2 [(gogoproto.nullable) = false];
-	optional uint64          NodeID  = 3 [(gogoproto.nullable) = false];
-	optional bytes           Context = 4;
+	optional ConfChangeType  type    = 2 [(gogoproto.nullable) = false];
+	optional uint64          node_id = 3 [(gogoproto.nullable) = false, (gogoproto.customname) = "NodeID" ];
+	optional bytes           context = 4;
+
+	// NB: this is used only by etcd to thread through a unique identifier.
+	// Ideally it should really use the Context instead. No counterpart to
+	// this field exists in ConfChangeV2.
+	optional uint64          id      = 1 [(gogoproto.nullable) = false, (gogoproto.customname) = "ID" ];
+}
+
+// ConfChangeSingle is an individual configuration change operation. Multiple
+// such operations can be carried out atomically via a ConfChangeV2.
+message ConfChangeSingle {
+	optional ConfChangeType  type    = 1 [(gogoproto.nullable) = false];
+	optional uint64          node_id = 2 [(gogoproto.nullable) = false, (gogoproto.customname) = "NodeID"];
+}
+
+// ConfChangeV2 messages initiate configuration changes. They support both the
+// simple "one at a time" membership change protocol and full Joint Consensus
+// allowing for arbitrary changes in membership.
+//
+// The supplied context is treated as an opaque payload and can be used to
+// attach an action on the state machine to the application of the config change
+// proposal. Note that contrary to Joint Consensus as outlined in the Raft
+// paper[1], configuration changes become active when they are *applied* to the
+// state machine (not when they are appended to the log).
+//
+// The simple protocol can be used whenever only a single change is made.
+//
+// Non-simple changes require the use of Joint Consensus, for which two
+// configuration changes are run. The first configuration change specifies the
+// desired changes and transitions the Raft group into the joint configuration,
+// in which quorum requires a majority of both the pre-changes and post-changes
+// configuration. Joint Consensus avoids entering fragile intermediate
+// configurations that could compromise survivability. For example, without the
+// use of Joint Consensus and running across three availability zones with a
+// replication factor of three, it is not possible to replace a voter without
+// entering an intermediate configuration that does not survive the outage of
+// one availability zone.
+//
+// The provided ConfChangeTransition specifies how (and whether) Joint Consensus
+// is used, and assigns the task of leaving the joint configuration either to
+// Raft or the application. Leaving the joint configuration is accomplished by
+// proposing a ConfChangeV2 with only and optionally the Context field
+// populated.
+//
+// For details on Raft membership changes, see:
+//
+// [1]: https://github.com/ongardie/dissertation/blob/master/online-trim.pdf
+message ConfChangeV2 {
+	optional ConfChangeTransition transition = 1 [(gogoproto.nullable) = false];
+	repeated ConfChangeSingle     changes =    2 [(gogoproto.nullable) = false];
+	optional bytes                context =    3;
 }