diff --git a/Documentation/dev-guide/api_reference_v3.md b/Documentation/dev-guide/api_reference_v3.md
index 8e7592a53..368b6110b 100644
--- a/Documentation/dev-guide/api_reference_v3.md
+++ b/Documentation/dev-guide/api_reference_v3.md
@@ -427,6 +427,7 @@ Empty field.
 | ----- | ----------- | ---- |
 | key | key is the first key to delete in the range. | bytes |
 | range_end | range_end is the key following the last key to delete for the range [key, range_end). If range_end is not given, the range is defined to contain only the key argument. If range_end is '\0', the range is all keys greater than or equal to the key argument. | bytes |
+| prev_kv | If prev_kv is set, etcd gets the previous key-value pairs before deleting it. The previous key-value pairs will be returned in the delte response. | bool |
 
 
 
@@ -436,6 +437,7 @@ Empty field.
 | ----- | ----------- | ---- |
 | header |  | ResponseHeader |
 | deleted | deleted is the number of keys deleted by the delete range request. | int64 |
+| prev_kvs | if prev_kv is set in the request, the previous key-value pairs will be returned. | (slice of) mvccpb.KeyValue |
 
 
 
@@ -591,6 +593,7 @@ Empty field.
 | key | key is the key, in bytes, to put into the key-value store. | bytes |
 | value | value is the value, in bytes, to associate with the key in the key-value store. | bytes |
 | lease | lease is the lease ID to associate with the key in the key-value store. A lease value of 0 indicates no lease. | int64 |
+| prev_kv | If prev_kv is set, etcd gets the previous key-value pair before changing it. The previous key-value pair will be returned in the put response. | bool |
 
 
 
@@ -599,6 +602,7 @@ Empty field.
 | Field | Description | Type |
 | ----- | ----------- | ---- |
 | header |  | ResponseHeader |
+| prev_kv | if prev_kv is set in the request, the previous key-value pair will be returned. | mvccpb.KeyValue |
 
 
 
diff --git a/Documentation/dev-guide/apispec/swagger/rpc.swagger.json b/Documentation/dev-guide/apispec/swagger/rpc.swagger.json
index ee1c659e8..147236f5b 100644
--- a/Documentation/dev-guide/apispec/swagger/rpc.swagger.json
+++ b/Documentation/dev-guide/apispec/swagger/rpc.swagger.json
@@ -1474,6 +1474,11 @@
           "format": "byte",
           "description": "key is the first key to delete in the range."
         },
+        "prev_kv": {
+          "type": "boolean",
+          "format": "boolean",
+          "description": "If prev_kv is set, etcd gets the previous key-value pairs before deleting it.\nThe previous key-value pairs will be returned in the delte response."
+        },
         "range_end": {
           "type": "string",
           "format": "byte",
@@ -1491,6 +1496,13 @@
         },
         "header": {
           "$ref": "#/definitions/etcdserverpbResponseHeader"
+        },
+        "prev_kvs": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/mvccpbKeyValue"
+          },
+          "description": "if prev_kv is set in the request, the previous key-value pairs will be returned."
         }
       }
     },
@@ -1724,6 +1736,11 @@
           "format": "int64",
           "description": "lease is the lease ID to associate with the key in the key-value store. A lease\nvalue of 0 indicates no lease."
         },
+        "prev_kv": {
+          "type": "boolean",
+          "format": "boolean",
+          "description": "If prev_kv is set, etcd gets the previous key-value pair before changing it.\nThe previous key-value pair will be returned in the put response."
+        },
         "value": {
           "type": "string",
           "format": "byte",
@@ -1736,6 +1753,10 @@
       "properties": {
         "header": {
           "$ref": "#/definitions/etcdserverpbResponseHeader"
+        },
+        "prev_kv": {
+          "$ref": "#/definitions/mvccpbKeyValue",
+          "description": "if prev_kv is set in the request, the previous key-value pair will be returned."
         }
       }
     },
diff --git a/auth/authpb/auth.pb.go b/auth/authpb/auth.pb.go
index 448e1eaa0..bafa775d5 100644
--- a/auth/authpb/auth.pb.go
+++ b/auth/authpb/auth.pb.go
@@ -21,9 +21,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
diff --git a/etcdserver/etcdserverpb/etcdserver.pb.go b/etcdserver/etcdserverpb/etcdserver.pb.go
index 746e9a116..ac4be4f6c 100644
--- a/etcdserver/etcdserverpb/etcdserver.pb.go
+++ b/etcdserver/etcdserverpb/etcdserver.pb.go
@@ -102,9 +102,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
diff --git a/etcdserver/etcdserverpb/raft_internal.pb.go b/etcdserver/etcdserverpb/raft_internal.pb.go
index 068aefff0..a82e2b235 100644
--- a/etcdserver/etcdserverpb/raft_internal.pb.go
+++ b/etcdserver/etcdserverpb/raft_internal.pb.go
@@ -10,9 +10,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
diff --git a/etcdserver/etcdserverpb/rpc.pb.go b/etcdserver/etcdserverpb/rpc.pb.go
index 213d54426..c57824048 100644
--- a/etcdserver/etcdserverpb/rpc.pb.go
+++ b/etcdserver/etcdserverpb/rpc.pb.go
@@ -11,16 +11,15 @@ import (
 
 	math "math"
 
+	mvccpb "github.com/coreos/etcd/mvcc/mvccpb"
+
 	authpb "github.com/coreos/etcd/auth/authpb"
 
-	io "io"
-)
-
-import mvccpb "github.com/coreos/etcd/mvcc/mvccpb"
-
-import (
 	context "golang.org/x/net/context"
+
 	grpc "google.golang.org/grpc"
+
+	io "io"
 )
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -271,6 +270,9 @@ type PutRequest struct {
 	// lease is the lease ID to associate with the key in the key-value store. A lease
 	// value of 0 indicates no lease.
 	Lease int64 `protobuf:"varint,3,opt,name=lease,proto3" json:"lease,omitempty"`
+	// If prev_kv is set, etcd gets the previous key-value pair before changing it.
+	// The previous key-value pair will be returned in the put response.
+	PrevKv bool `protobuf:"varint,4,opt,name=prev_kv,json=prevKv,proto3" json:"prev_kv,omitempty"`
 }
 
 func (m *PutRequest) Reset()                    { *m = PutRequest{} }
@@ -280,6 +282,8 @@ func (*PutRequest) Descriptor() ([]byte, []int) { return fileDescriptorRpc, []in
 
 type PutResponse struct {
 	Header *ResponseHeader `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
+	// if prev_kv is set in the request, the previous key-value pair will be returned.
+	PrevKv *mvccpb.KeyValue `protobuf:"bytes,2,opt,name=prev_kv,json=prevKv" json:"prev_kv,omitempty"`
 }
 
 func (m *PutResponse) Reset()                    { *m = PutResponse{} }
@@ -294,6 +298,13 @@ func (m *PutResponse) GetHeader() *ResponseHeader {
 	return nil
 }
 
+func (m *PutResponse) GetPrevKv() *mvccpb.KeyValue {
+	if m != nil {
+		return m.PrevKv
+	}
+	return nil
+}
+
 type DeleteRangeRequest struct {
 	// key is the first key to delete in the range.
 	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
@@ -301,6 +312,9 @@ type DeleteRangeRequest struct {
 	// If range_end is not given, the range is defined to contain only the key argument.
 	// If range_end is '\0', the range is all keys greater than or equal to the key argument.
 	RangeEnd []byte `protobuf:"bytes,2,opt,name=range_end,json=rangeEnd,proto3" json:"range_end,omitempty"`
+	// If prev_kv is set, etcd gets the previous key-value pairs before deleting it.
+	// The previous key-value pairs will be returned in the delte response.
+	PrevKv bool `protobuf:"varint,3,opt,name=prev_kv,json=prevKv,proto3" json:"prev_kv,omitempty"`
 }
 
 func (m *DeleteRangeRequest) Reset()                    { *m = DeleteRangeRequest{} }
@@ -312,6 +326,8 @@ type DeleteRangeResponse struct {
 	Header *ResponseHeader `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
 	// deleted is the number of keys deleted by the delete range request.
 	Deleted int64 `protobuf:"varint,2,opt,name=deleted,proto3" json:"deleted,omitempty"`
+	// if prev_kv is set in the request, the previous key-value pairs will be returned.
+	PrevKvs []*mvccpb.KeyValue `protobuf:"bytes,3,rep,name=prev_kvs,json=prevKvs" json:"prev_kvs,omitempty"`
 }
 
 func (m *DeleteRangeResponse) Reset()                    { *m = DeleteRangeResponse{} }
@@ -326,6 +342,13 @@ func (m *DeleteRangeResponse) GetHeader() *ResponseHeader {
 	return nil
 }
 
+func (m *DeleteRangeResponse) GetPrevKvs() []*mvccpb.KeyValue {
+	if m != nil {
+		return m.PrevKvs
+	}
+	return nil
+}
+
 type RequestOp struct {
 	// request is a union of request types accepted by a transaction.
 	//
@@ -3765,6 +3788,16 @@ func (m *PutRequest) MarshalTo(data []byte) (int, error) {
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Lease))
 	}
+	if m.PrevKv {
+		data[i] = 0x20
+		i++
+		if m.PrevKv {
+			data[i] = 1
+		} else {
+			data[i] = 0
+		}
+		i++
+	}
 	return i, nil
 }
 
@@ -3793,6 +3826,16 @@ func (m *PutResponse) MarshalTo(data []byte) (int, error) {
 		}
 		i += n2
 	}
+	if m.PrevKv != nil {
+		data[i] = 0x12
+		i++
+		i = encodeVarintRpc(data, i, uint64(m.PrevKv.Size()))
+		n3, err := m.PrevKv.MarshalTo(data[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n3
+	}
 	return i, nil
 }
 
@@ -3823,6 +3866,16 @@ func (m *DeleteRangeRequest) MarshalTo(data []byte) (int, error) {
 		i = encodeVarintRpc(data, i, uint64(len(m.RangeEnd)))
 		i += copy(data[i:], m.RangeEnd)
 	}
+	if m.PrevKv {
+		data[i] = 0x18
+		i++
+		if m.PrevKv {
+			data[i] = 1
+		} else {
+			data[i] = 0
+		}
+		i++
+	}
 	return i, nil
 }
 
@@ -3845,17 +3898,29 @@ func (m *DeleteRangeResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n3, err := m.Header.MarshalTo(data[i:])
+		n4, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n3
+		i += n4
 	}
 	if m.Deleted != 0 {
 		data[i] = 0x10
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Deleted))
 	}
+	if len(m.PrevKvs) > 0 {
+		for _, msg := range m.PrevKvs {
+			data[i] = 0x1a
+			i++
+			i = encodeVarintRpc(data, i, uint64(msg.Size()))
+			n, err := msg.MarshalTo(data[i:])
+			if err != nil {
+				return 0, err
+			}
+			i += n
+		}
+	}
 	return i, nil
 }
 
@@ -3875,11 +3940,11 @@ func (m *RequestOp) MarshalTo(data []byte) (int, error) {
 	var l int
 	_ = l
 	if m.Request != nil {
-		nn4, err := m.Request.MarshalTo(data[i:])
+		nn5, err := m.Request.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += nn4
+		i += nn5
 	}
 	return i, nil
 }
@@ -3890,11 +3955,11 @@ func (m *RequestOp_RequestRange) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.RequestRange.Size()))
-		n5, err := m.RequestRange.MarshalTo(data[i:])
+		n6, err := m.RequestRange.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n5
+		i += n6
 	}
 	return i, nil
 }
@@ -3904,11 +3969,11 @@ func (m *RequestOp_RequestPut) MarshalTo(data []byte) (int, error) {
 		data[i] = 0x12
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.RequestPut.Size()))
-		n6, err := m.RequestPut.MarshalTo(data[i:])
+		n7, err := m.RequestPut.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n6
+		i += n7
 	}
 	return i, nil
 }
@@ -3918,11 +3983,11 @@ func (m *RequestOp_RequestDeleteRange) MarshalTo(data []byte) (int, error) {
 		data[i] = 0x1a
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.RequestDeleteRange.Size()))
-		n7, err := m.RequestDeleteRange.MarshalTo(data[i:])
+		n8, err := m.RequestDeleteRange.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n7
+		i += n8
 	}
 	return i, nil
 }
@@ -3942,11 +4007,11 @@ func (m *ResponseOp) MarshalTo(data []byte) (int, error) {
 	var l int
 	_ = l
 	if m.Response != nil {
-		nn8, err := m.Response.MarshalTo(data[i:])
+		nn9, err := m.Response.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += nn8
+		i += nn9
 	}
 	return i, nil
 }
@@ -3957,11 +4022,11 @@ func (m *ResponseOp_ResponseRange) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.ResponseRange.Size()))
-		n9, err := m.ResponseRange.MarshalTo(data[i:])
+		n10, err := m.ResponseRange.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n9
+		i += n10
 	}
 	return i, nil
 }
@@ -3971,11 +4036,11 @@ func (m *ResponseOp_ResponsePut) MarshalTo(data []byte) (int, error) {
 		data[i] = 0x12
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.ResponsePut.Size()))
-		n10, err := m.ResponsePut.MarshalTo(data[i:])
+		n11, err := m.ResponsePut.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n10
+		i += n11
 	}
 	return i, nil
 }
@@ -3985,11 +4050,11 @@ func (m *ResponseOp_ResponseDeleteRange) MarshalTo(data []byte) (int, error) {
 		data[i] = 0x1a
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.ResponseDeleteRange.Size()))
-		n11, err := m.ResponseDeleteRange.MarshalTo(data[i:])
+		n12, err := m.ResponseDeleteRange.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n11
+		i += n12
 	}
 	return i, nil
 }
@@ -4025,11 +4090,11 @@ func (m *Compare) MarshalTo(data []byte) (int, error) {
 		i += copy(data[i:], m.Key)
 	}
 	if m.TargetUnion != nil {
-		nn12, err := m.TargetUnion.MarshalTo(data[i:])
+		nn13, err := m.TargetUnion.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += nn12
+		i += nn13
 	}
 	return i, nil
 }
@@ -4138,11 +4203,11 @@ func (m *TxnResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n13, err := m.Header.MarshalTo(data[i:])
+		n14, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n13
+		i += n14
 	}
 	if m.Succeeded {
 		data[i] = 0x10
@@ -4221,11 +4286,11 @@ func (m *CompactionResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n14, err := m.Header.MarshalTo(data[i:])
+		n15, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n14
+		i += n15
 	}
 	return i, nil
 }
@@ -4267,11 +4332,11 @@ func (m *HashResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n15, err := m.Header.MarshalTo(data[i:])
+		n16, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n15
+		i += n16
 	}
 	if m.Hash != 0 {
 		data[i] = 0x10
@@ -4318,11 +4383,11 @@ func (m *SnapshotResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n16, err := m.Header.MarshalTo(data[i:])
+		n17, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n16
+		i += n17
 	}
 	if m.RemainingBytes != 0 {
 		data[i] = 0x10
@@ -4354,11 +4419,11 @@ func (m *WatchRequest) MarshalTo(data []byte) (int, error) {
 	var l int
 	_ = l
 	if m.RequestUnion != nil {
-		nn17, err := m.RequestUnion.MarshalTo(data[i:])
+		nn18, err := m.RequestUnion.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += nn17
+		i += nn18
 	}
 	return i, nil
 }
@@ -4369,11 +4434,11 @@ func (m *WatchRequest_CreateRequest) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.CreateRequest.Size()))
-		n18, err := m.CreateRequest.MarshalTo(data[i:])
+		n19, err := m.CreateRequest.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n18
+		i += n19
 	}
 	return i, nil
 }
@@ -4383,11 +4448,11 @@ func (m *WatchRequest_CancelRequest) MarshalTo(data []byte) (int, error) {
 		data[i] = 0x12
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.CancelRequest.Size()))
-		n19, err := m.CancelRequest.MarshalTo(data[i:])
+		n20, err := m.CancelRequest.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n19
+		i += n20
 	}
 	return i, nil
 }
@@ -4478,11 +4543,11 @@ func (m *WatchResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n20, err := m.Header.MarshalTo(data[i:])
+		n21, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n20
+		i += n21
 	}
 	if m.WatchId != 0 {
 		data[i] = 0x10
@@ -4576,11 +4641,11 @@ func (m *LeaseGrantResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n21, err := m.Header.MarshalTo(data[i:])
+		n22, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n21
+		i += n22
 	}
 	if m.ID != 0 {
 		data[i] = 0x10
@@ -4643,11 +4708,11 @@ func (m *LeaseRevokeResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n22, err := m.Header.MarshalTo(data[i:])
+		n23, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n22
+		i += n23
 	}
 	return i, nil
 }
@@ -4694,11 +4759,11 @@ func (m *LeaseKeepAliveResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n23, err := m.Header.MarshalTo(data[i:])
+		n24, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n23
+		i += n24
 	}
 	if m.ID != 0 {
 		data[i] = 0x10
@@ -4824,21 +4889,21 @@ func (m *MemberAddResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n24, err := m.Header.MarshalTo(data[i:])
+		n25, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n24
+		i += n25
 	}
 	if m.Member != nil {
 		data[i] = 0x12
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Member.Size()))
-		n25, err := m.Member.MarshalTo(data[i:])
+		n26, err := m.Member.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n25
+		i += n26
 	}
 	return i, nil
 }
@@ -4885,11 +4950,11 @@ func (m *MemberRemoveResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n26, err := m.Header.MarshalTo(data[i:])
+		n27, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n26
+		i += n27
 	}
 	return i, nil
 }
@@ -4951,11 +5016,11 @@ func (m *MemberUpdateResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n27, err := m.Header.MarshalTo(data[i:])
+		n28, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n27
+		i += n28
 	}
 	return i, nil
 }
@@ -4997,11 +5062,11 @@ func (m *MemberListResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n28, err := m.Header.MarshalTo(data[i:])
+		n29, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n28
+		i += n29
 	}
 	if len(m.Members) > 0 {
 		for _, msg := range m.Members {
@@ -5055,11 +5120,11 @@ func (m *DefragmentResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n29, err := m.Header.MarshalTo(data[i:])
+		n30, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n29
+		i += n30
 	}
 	return i, nil
 }
@@ -5144,11 +5209,11 @@ func (m *AlarmResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n30, err := m.Header.MarshalTo(data[i:])
+		n31, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n30
+		i += n31
 	}
 	if len(m.Alarms) > 0 {
 		for _, msg := range m.Alarms {
@@ -5202,11 +5267,11 @@ func (m *StatusResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n31, err := m.Header.MarshalTo(data[i:])
+		n32, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n31
+		i += n32
 	}
 	if len(m.Version) > 0 {
 		data[i] = 0x12
@@ -5604,11 +5669,11 @@ func (m *AuthRoleGrantPermissionRequest) MarshalTo(data []byte) (int, error) {
 		data[i] = 0x12
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Perm.Size()))
-		n32, err := m.Perm.MarshalTo(data[i:])
+		n33, err := m.Perm.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n32
+		i += n33
 	}
 	return i, nil
 }
@@ -5668,11 +5733,11 @@ func (m *AuthEnableResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n33, err := m.Header.MarshalTo(data[i:])
+		n34, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n33
+		i += n34
 	}
 	return i, nil
 }
@@ -5696,11 +5761,11 @@ func (m *AuthDisableResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n34, err := m.Header.MarshalTo(data[i:])
+		n35, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n34
+		i += n35
 	}
 	return i, nil
 }
@@ -5724,11 +5789,11 @@ func (m *AuthenticateResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n35, err := m.Header.MarshalTo(data[i:])
+		n36, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n35
+		i += n36
 	}
 	if len(m.Token) > 0 {
 		data[i] = 0x12
@@ -5758,11 +5823,11 @@ func (m *AuthUserAddResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n36, err := m.Header.MarshalTo(data[i:])
+		n37, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n36
+		i += n37
 	}
 	return i, nil
 }
@@ -5786,11 +5851,11 @@ func (m *AuthUserGetResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n37, err := m.Header.MarshalTo(data[i:])
+		n38, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n37
+		i += n38
 	}
 	if len(m.Roles) > 0 {
 		for _, s := range m.Roles {
@@ -5829,11 +5894,11 @@ func (m *AuthUserDeleteResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n38, err := m.Header.MarshalTo(data[i:])
+		n39, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n38
+		i += n39
 	}
 	return i, nil
 }
@@ -5857,11 +5922,11 @@ func (m *AuthUserChangePasswordResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n39, err := m.Header.MarshalTo(data[i:])
+		n40, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n39
+		i += n40
 	}
 	return i, nil
 }
@@ -5885,11 +5950,11 @@ func (m *AuthUserGrantRoleResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n40, err := m.Header.MarshalTo(data[i:])
+		n41, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n40
+		i += n41
 	}
 	return i, nil
 }
@@ -5913,11 +5978,11 @@ func (m *AuthUserRevokeRoleResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n41, err := m.Header.MarshalTo(data[i:])
+		n42, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n41
+		i += n42
 	}
 	return i, nil
 }
@@ -5941,11 +6006,11 @@ func (m *AuthRoleAddResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n42, err := m.Header.MarshalTo(data[i:])
+		n43, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n42
+		i += n43
 	}
 	return i, nil
 }
@@ -5969,11 +6034,11 @@ func (m *AuthRoleGetResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n43, err := m.Header.MarshalTo(data[i:])
+		n44, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n43
+		i += n44
 	}
 	if len(m.Perm) > 0 {
 		for _, msg := range m.Perm {
@@ -6009,11 +6074,11 @@ func (m *AuthRoleListResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n44, err := m.Header.MarshalTo(data[i:])
+		n45, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n44
+		i += n45
 	}
 	if len(m.Roles) > 0 {
 		for _, s := range m.Roles {
@@ -6052,11 +6117,11 @@ func (m *AuthUserListResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n45, err := m.Header.MarshalTo(data[i:])
+		n46, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n45
+		i += n46
 	}
 	if len(m.Users) > 0 {
 		for _, s := range m.Users {
@@ -6095,11 +6160,11 @@ func (m *AuthRoleDeleteResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n46, err := m.Header.MarshalTo(data[i:])
+		n47, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n46
+		i += n47
 	}
 	return i, nil
 }
@@ -6123,11 +6188,11 @@ func (m *AuthRoleGrantPermissionResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n47, err := m.Header.MarshalTo(data[i:])
+		n48, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n47
+		i += n48
 	}
 	return i, nil
 }
@@ -6151,11 +6216,11 @@ func (m *AuthRoleRevokePermissionResponse) MarshalTo(data []byte) (int, error) {
 		data[i] = 0xa
 		i++
 		i = encodeVarintRpc(data, i, uint64(m.Header.Size()))
-		n48, err := m.Header.MarshalTo(data[i:])
+		n49, err := m.Header.MarshalTo(data[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n48
+		i += n49
 	}
 	return i, nil
 }
@@ -6276,6 +6341,9 @@ func (m *PutRequest) Size() (n int) {
 	if m.Lease != 0 {
 		n += 1 + sovRpc(uint64(m.Lease))
 	}
+	if m.PrevKv {
+		n += 2
+	}
 	return n
 }
 
@@ -6286,6 +6354,10 @@ func (m *PutResponse) Size() (n int) {
 		l = m.Header.Size()
 		n += 1 + l + sovRpc(uint64(l))
 	}
+	if m.PrevKv != nil {
+		l = m.PrevKv.Size()
+		n += 1 + l + sovRpc(uint64(l))
+	}
 	return n
 }
 
@@ -6300,6 +6372,9 @@ func (m *DeleteRangeRequest) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovRpc(uint64(l))
 	}
+	if m.PrevKv {
+		n += 2
+	}
 	return n
 }
 
@@ -6313,6 +6388,12 @@ func (m *DeleteRangeResponse) Size() (n int) {
 	if m.Deleted != 0 {
 		n += 1 + sovRpc(uint64(m.Deleted))
 	}
+	if len(m.PrevKvs) > 0 {
+		for _, e := range m.PrevKvs {
+			l = e.Size()
+			n += 1 + l + sovRpc(uint64(l))
+		}
+	}
 	return n
 }
 
@@ -7923,6 +8004,26 @@ func (m *PutRequest) Unmarshal(data []byte) error {
 					break
 				}
 			}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PrevKv", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRpc
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				v |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.PrevKv = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRpc(data[iNdEx:])
@@ -8006,6 +8107,39 @@ func (m *PutResponse) Unmarshal(data []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PrevKv", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRpc
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthRpc
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.PrevKv == nil {
+				m.PrevKv = &mvccpb.KeyValue{}
+			}
+			if err := m.PrevKv.Unmarshal(data[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRpc(data[iNdEx:])
@@ -8118,6 +8252,26 @@ func (m *DeleteRangeRequest) Unmarshal(data []byte) error {
 				m.RangeEnd = []byte{}
 			}
 			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PrevKv", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRpc
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				v |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.PrevKv = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRpc(data[iNdEx:])
@@ -8220,6 +8374,37 @@ func (m *DeleteRangeResponse) Unmarshal(data []byte) error {
 					break
 				}
 			}
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PrevKvs", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRpc
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthRpc
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.PrevKvs = append(m.PrevKvs, &mvccpb.KeyValue{})
+			if err := m.PrevKvs[len(m.PrevKvs)-1].Unmarshal(data[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRpc(data[iNdEx:])
@@ -15125,203 +15310,205 @@ var (
 )
 
 var fileDescriptorRpc = []byte{
-	// 3154 bytes of a gzipped FileDescriptorProto
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+	0xc0, 0xf7, 0x18, 0xf4, 0x2d, 0xac, 0xfb, 0xd0, 0x83, 0x80, 0x7f, 0x83, 0x75, 0x11, 0xa8, 0xca,
+	0x67, 0x90, 0xe7, 0x5d, 0x03, 0x14, 0xe1, 0x16, 0xea, 0x2e, 0xe8, 0x37, 0xe2, 0x17, 0x13, 0x6f,
+	0x99, 0x8a, 0xe5, 0x32, 0x62, 0x0a, 0xf6, 0x3d, 0x80, 0xa0, 0x4d, 0x15, 0xb5, 0xef, 0x44, 0x57,
+	0x4b, 0x5f, 0x49, 0x26, 0x10, 0xc0, 0x8f, 0x18, 0xf0, 0x5d, 0x7c, 0x2b, 0x16, 0xb8, 0xed, 0x6f,
+	0xa0, 0xe0, 0x2d, 0xc8, 0x6d, 0x9b, 0x6e, 0x17, 0x45, 0x42, 0xbf, 0xf2, 0xb9, 0x4c, 0xd7, 0xe3,
+	0x96, 0x04, 0xd4, 0x5d, 0x06, 0xb5, 0x8c, 0x97, 0x62, 0xa1, 0xba, 0xa6, 0x4b, 0x23, 0x29, 0x1a,
+	0x41, 0x51, 0x7e, 0x02, 0x43, 0x37, 0x23, 0x36, 0x0b, 0x7f, 0x2e, 0xd3, 0x97, 0x93, 0x96, 0x05,
+	0xe0, 0x2a, 0x03, 0xc4, 0xf8, 0x66, 0xbc, 0x51, 0x05, 0xf9, 0x63, 0xed, 0xd1, 0x5b, 0xda, 0xfa,
+	0x4f, 0x6a, 0x90, 0xa3, 0x59, 0x0a, 0x8d, 0xdd, 0x41, 0x71, 0x17, 0xb5, 0xf0, 0x44, 0x4b, 0x25,
+	0x6a, 0xe1, 0xc9, 0xba, 0x30, 0x26, 0x76, 0xb3, 0x5f, 0xac, 0x11, 0x46, 0x45, 0x35, 0xf6, 0xa0,
+	0xac, 0x94, 0x80, 0x28, 0x86, 0x63, 0xb8, 0x61, 0x13, 0x8d, 0xdd, 0x31, 0xf5, 0x23, 0x5e, 0x61,
+	0xa0, 0x3a, 0xbe, 0x1a, 0x06, 0x6d, 0x73, 0x32, 0x8a, 0xfa, 0x7d, 0xa8, 0xa8, 0xb5, 0x22, 0x8a,
+	0x61, 0x1a, 0xe9, 0x08, 0x45, 0x63, 0x45, 0x5c, 0xa9, 0x19, 0xe3, 0x34, 0xfe, 0xef, 0xf3, 0x24,
+	0x2d, 0x45, 0xff, 0x04, 0x0a, 0xa2, 0x82, 0x8c, 0xd3, 0x37, 0xdc, 0x43, 0x8a, 0xd3, 0x37, 0x52,
+	0x7e, 0xc6, 0x24, 0x02, 0x0c, 0x96, 0x66, 0xca, 0x32, 0x40, 0x0b, 0xc8, 0xa7, 0xc4, 0x4b, 0x82,
+	0x0c, 0xba, 0x22, 0x49, 0x90, 0x4a, 0x95, 0x32, 0x15, 0xb2, 0x43, 0x3c, 0x71, 0x97, 0x65, 0x09,
+	0x80, 0x12, 0x38, 0xaa, 0xd1, 0x10, 0x4f, 0x23, 0x49, 0xcc, 0xdd, 0x02, 0x54, 0x11, 0x0a, 0xd1,
+	0x0f, 0x00, 0x82, 0x72, 0x37, 0xfa, 0x3a, 0x8e, 0xed, 0x99, 0x45, 0x5f, 0xc7, 0xf1, 0x15, 0x73,
+	0x8c, 0x07, 0x07, 0xe0, 0x3c, 0x7f, 0xa4, 0xf0, 0x3f, 0xd3, 0x00, 0x4d, 0x96, 0xc7, 0xe8, 0xf5,
+	0x78, 0x88, 0xd8, 0x76, 0x9c, 0xfe, 0xc6, 0xe5, 0x88, 0x13, 0xa3, 0x67, 0x20, 0x57, 0x8b, 0x6d,
+	0x19, 0xbe, 0xa4, 0x92, 0x7d, 0xae, 0xc1, 0x5c, 0xa8, 0xc0, 0x46, 0xf7, 0x13, 0xce, 0x39, 0xd2,
+	0xd2, 0xd3, 0x1f, 0x5c, 0x48, 0x97, 0x98, 0xb1, 0x28, 0xb7, 0x42, 0x66, 0x6b, 0x3f, 0xd6, 0xa0,
+	0x1a, 0xae, 0xca, 0x51, 0x02, 0xc0, 0x44, 0x5f, 0x50, 0x5f, 0xbd, 0x98, 0xf0, 0x12, 0xa7, 0x15,
+	0x24, 0x70, 0x9f, 0x40, 0x41, 0x14, 0xf3, 0x71, 0x6e, 0x11, 0x6e, 0x2b, 0xc6, 0xb9, 0x45, 0xa4,
+	0x13, 0x90, 0xe4, 0x16, 0xb4, 0x2e, 0x56, 0x3c, 0x51, 0x94, 0xfc, 0x49, 0x90, 0xd3, 0x3d, 0x31,
+	0xd2, 0x2f, 0x98, 0x0a, 0x19, 0x78, 0xa2, 0x2c, 0xf8, 0x51, 0x02, 0xc7, 0x0b, 0x3c, 0x31, 0xda,
+	0x2f, 0x48, 0xf2, 0x44, 0x86, 0xaa, 0x78, 0x62, 0x50, 0x9f, 0xc7, 0x79, 0xe2, 0x44, 0xd3, 0x34,
+	0xce, 0x13, 0x27, 0x4b, 0xfc, 0xa4, 0xb3, 0x65, 0xe0, 0x21, 0x4f, 0x5c, 0x88, 0xa9, 0xe7, 0xd1,
+	0x1b, 0x09, 0x36, 0x8d, 0x6d, 0xc8, 0xea, 0x6f, 0x5e, 0x92, 0x7a, 0xba, 0x07, 0xf0, 0xd3, 0x90,
+	0x1e, 0xf0, 0x2b, 0x0d, 0x16, 0xe3, 0x1a, 0x02, 0x28, 0x01, 0x2c, 0xa1, 0x9b, 0xab, 0xaf, 0x5d,
+	0x96, 0xfc, 0x12, 0x76, 0xf3, 0x7d, 0xe2, 0x49, 0xed, 0x77, 0x5f, 0x2d, 0x6b, 0x5f, 0x7e, 0xb5,
+	0xac, 0xfd, 0xe9, 0xab, 0x65, 0xed, 0xe7, 0x7f, 0x5e, 0x9e, 0x39, 0xcd, 0xb3, 0x9f, 0x8d, 0xbf,
+	0xf3, 0xef, 0x00, 0x00, 0x00, 0xff, 0xff, 0xaa, 0x65, 0xab, 0x8d, 0xbd, 0x2e, 0x00, 0x00,
 }
diff --git a/etcdserver/etcdserverpb/rpc.proto b/etcdserver/etcdserverpb/rpc.proto
index 04f08cb56..a15bfd603 100644
--- a/etcdserver/etcdserverpb/rpc.proto
+++ b/etcdserver/etcdserverpb/rpc.proto
@@ -396,10 +396,16 @@ message PutRequest {
   // lease is the lease ID to associate with the key in the key-value store. A lease
   // value of 0 indicates no lease.
   int64 lease = 3;
+
+  // If prev_kv is set, etcd gets the previous key-value pair before changing it.
+  // The previous key-value pair will be returned in the put response.
+  bool prev_kv = 4;
 }
 
 message PutResponse {
   ResponseHeader header = 1;
+  // if prev_kv is set in the request, the previous key-value pair will be returned.
+  mvccpb.KeyValue prev_kv = 2;
 }
 
 message DeleteRangeRequest {
@@ -409,12 +415,17 @@ message DeleteRangeRequest {
   // If range_end is not given, the range is defined to contain only the key argument.
   // If range_end is '\0', the range is all keys greater than or equal to the key argument.
   bytes range_end = 2;
+  // If prev_kv is set, etcd gets the previous key-value pairs before deleting it.
+  // The previous key-value pairs will be returned in the delte response.
+  bool prev_kv = 3;
 }
 
 message DeleteRangeResponse {
   ResponseHeader header = 1;
   // deleted is the number of keys deleted by the delete range request.
   int64 deleted = 2;
+  // if prev_kv is set in the request, the previous key-value pairs will be returned.
+  repeated mvccpb.KeyValue prev_kvs = 3;
 }
 
 message RequestOp {
diff --git a/lease/leasepb/lease.pb.go b/lease/leasepb/lease.pb.go
index 62115a3c9..dde5f286e 100644
--- a/lease/leasepb/lease.pb.go
+++ b/lease/leasepb/lease.pb.go
@@ -19,9 +19,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
diff --git a/mvcc/mvccpb/kv.pb.go b/mvcc/mvccpb/kv.pb.go
index 2ab97270c..5f463a2cc 100644
--- a/mvcc/mvccpb/kv.pb.go
+++ b/mvcc/mvccpb/kv.pb.go
@@ -20,9 +20,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
diff --git a/raft/raftpb/raft.pb.go b/raft/raftpb/raft.pb.go
index 6199ee816..664b5b828 100644
--- a/raft/raftpb/raft.pb.go
+++ b/raft/raftpb/raft.pb.go
@@ -25,9 +25,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
diff --git a/snap/snappb/snap.pb.go b/snap/snappb/snap.pb.go
index 11c86dfea..f9ef5077d 100644
--- a/snap/snappb/snap.pb.go
+++ b/snap/snappb/snap.pb.go
@@ -19,9 +19,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
diff --git a/wal/walpb/record.pb.go b/wal/walpb/record.pb.go
index bc715a818..0e86f363e 100644
--- a/wal/walpb/record.pb.go
+++ b/wal/walpb/record.pb.go
@@ -20,9 +20,9 @@ import (
 	proto "github.com/golang/protobuf/proto"
 
 	math "math"
-)
 
-import io "io"
+	io "io"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal