*: rename preserveKVs to prevKv

Documentation/dev-guide/apispec/swagger/rpc.swagger.json

@@ -671,10 +671,10 @@
           "format": "byte",
           "description": "key is the first key to delete in the range."
         },
-        "preserveKVs": {
+        "prev_kv": {
           "type": "boolean",
           "format": "boolean",
-          "description": "If preserveKVs is set, the deleted KVs will be preserved for delete events\nThe preserved KVs will be returned as response.\nIt requires read permission to read the deleted KVs."
+          "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",
@@ -686,13 +686,6 @@
     "etcdserverpbDeleteRangeResponse": {
       "type": "object",
       "properties": {
-        "KVs": {
-          "type": "array",
-          "items": {
-            "$ref": "#/definitions/mvccpbKeyValue"
-          },
-          "description": "if preserveKVs is set in the request, the deleted KVs will be returned."
-        },
         "deleted": {
           "type": "string",
           "format": "int64",
@@ -700,6 +693,13 @@
         },
         "header": {
           "$ref": "#/definitions/etcdserverpbResponseHeader"
+        },
+        "prev_kvs": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/mvccpbKeyValue"
+          },
+          "description": "if prev_kv is set in the request, the previous key-value pairs will be returned."
         }
       }
     },
@@ -933,6 +933,11 @@
           "format": "int64",
           "description": "lease is the lease ID to associate with the key in the key-value store. A lease\nvalue of 0 indicates no lease."
         },
+        "prev_kv": {
+          "type": "boolean",
+          "format": "boolean",
+          "description": "If prev_kv is set, etcd gets the previous key-value pair before changing it.\nThe previous key-value pair will be returned in the put response."
+        },
         "value": {
           "type": "string",
           "format": "byte",
@@ -945,6 +950,10 @@
       "properties": {
         "header": {
           "$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."
         }
       }
     },

clientv3/kv.go

@@ -163,7 +163,7 @@ func (kv *kv) do(ctx context.Context, op Op) (OpResponse, error) {
 		}
 	case tDeleteRange:
 		var resp *pb.DeleteRangeResponse
-		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end, PreserveKVs: op.preserveKVs}
+		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end, PrevKv: op.prevKV}
 		resp, err = kv.remote.DeleteRange(ctx, r)
 		if err == nil {
 			return OpResponse{del: (*DeleteResponse)(resp)}, nil

clientv3/op.go

@@ -45,11 +45,9 @@ type Op struct {
 	// for range, watch
 	rev int64
 
+	// for watch, put, delete
 	prevKV bool
 
-	// for delete
-	preserveKVs bool
-
 	// progressNotify is for progress updates.
 	progressNotify bool
 
@@ -79,7 +77,7 @@ func (op Op) toRequestOp() *pb.RequestOp {
 		r := &pb.PutRequest{Key: op.key, Value: op.val, Lease: int64(op.leaseID)}
 		return &pb.RequestOp{Request: &pb.RequestOp_RequestPut{RequestPut: r}}
 	case tDeleteRange:
-		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end, PreserveKVs: op.preserveKVs}
+		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end, PrevKv: op.prevKV}
 
 		return &pb.RequestOp{Request: &pb.RequestOp_RequestDeleteRange{RequestDeleteRange: r}}
 	default:
@@ -133,8 +131,6 @@ func OpPut(key, val string, opts ...OpOption) Op {
 		panic("unexpected serializable in put")
 	case ret.countOnly:
 		panic("unexpected countOnly in put")
-	case ret.preserveKVs:
-		panic("unexpected preserveKVs in put")
 	}
 	return ret
 }
@@ -153,8 +149,6 @@ func opWatch(key string, opts ...OpOption) Op {
 		panic("unexpected serializable in watch")
 	case ret.countOnly:
 		panic("unexpected countOnly in watch")
-	case ret.preserveKVs:
-		panic("unexpected preserveKVs in watch")
 	}
 	return ret
 }
@@ -266,11 +260,6 @@ func withTop(target SortTarget, order SortOrder) []OpOption {
 	return []OpOption{WithPrefix(), WithSort(target, order), WithLimit(1)}
 }
 
-// WithPreserveKVs preserves the deleted KVs for attaching in responses.
-func WithPreserveKVs() OpOption {
-	return func(op *Op) { op.preserveKVs = true }
-}
-
 // WithProgressNotify makes watch server send periodic progress updates.
 // Progress updates have zero events in WatchResponse.
 func WithProgressNotify() OpOption {

etcdctl/ctlv3/command/del_command.go

@@ -23,7 +23,7 @@ import (
 
 var (
 	delPrefix bool
-	delKVs    bool
+	delPrevKV bool
 )
 
 // NewDelCommand returns the cobra command for "del".
@@ -35,7 +35,7 @@ func NewDelCommand() *cobra.Command {
 	}
 
 	cmd.Flags().BoolVar(&delPrefix, "prefix", false, "delete keys with matching prefix")
-	cmd.Flags().BoolVar(&delKVs, "preserve-kvs", false, "preserve and return deleted key-value pairs")
+	cmd.Flags().BoolVar(&delPrevKV, "prev-kv", false, "return deleted key-value pairs")
 
 	return cmd
 }
@@ -68,8 +68,8 @@ func getDelOp(cmd *cobra.Command, args []string) (string, []clientv3.OpOption) {
 	if delPrefix {
 		opts = append(opts, clientv3.WithPrefix())
 	}
-	if delKVs {
-		opts = append(opts, clientv3.WithPreserveKVs())
+	if delPrevKV {
+		opts = append(opts, clientv3.WithPrevKV())
 	}
 
 	return key, opts

etcdctl/ctlv3/command/printer.go

@@ -108,7 +108,7 @@ type simplePrinter struct {
 
 func (s *simplePrinter) Del(resp v3.DeleteResponse) {
 	fmt.Println(resp.Deleted)
-	for _, kv := range resp.KVs {
+	for _, kv := range resp.PrevKvs {
 		printKV(s.isHex, kv)
 	}
 }

etcdserver/apply.go

@@ -192,7 +192,7 @@ func (a *applierV3backend) DeleteRange(txnID int64, dr *pb.DeleteRangeRequest) (
 	}
 
 	var rr *mvcc.RangeResult
-	if dr.PreserveKVs {
+	if dr.PrevKv {
 		if txnID != noTxn {
 			rr, err = a.s.KV().TxnRange(txnID, dr.Key, dr.RangeEnd, mvcc.RangeOptions{})
 			if err != nil {
@@ -218,7 +218,7 @@ func (a *applierV3backend) DeleteRange(txnID int64, dr *pb.DeleteRangeRequest) (
 	resp.Deleted = n
 	if rr != nil {
 		for i := range rr.KVs {
-			resp.KVs = append(resp.KVs, &rr.KVs[i])
+			resp.PrevKvs = append(resp.PrevKvs, &rr.KVs[i])
 		}
 	}
 	resp.Header.Revision = rev

etcdserver/apply_auth.go

@@ -70,7 +70,7 @@ func (aa *authApplierV3) DeleteRange(txnID int64, r *pb.DeleteRangeRequest) (*pb
 	if !aa.as.IsDeleteRangePermitted(aa.user, r.Key, r.RangeEnd) {
 		return nil, auth.ErrPermissionDenied
 	}
-	if r.PreserveKVs && !aa.as.IsRangePermitted(aa.user, r.Key, r.RangeEnd) {
+	if r.PrevKv && !aa.as.IsRangePermitted(aa.user, r.Key, r.RangeEnd) {
 		return nil, auth.ErrPermissionDenied
 	}
 
@@ -103,7 +103,7 @@ func (aa *authApplierV3) checkTxnReqsPermission(reqs []*pb.RequestOp) bool {
 				continue
 			}
 
-			if tv.RequestDeleteRange.PreserveKVs && !aa.as.IsRangePermitted(aa.user, tv.RequestDeleteRange.Key, tv.RequestDeleteRange.RangeEnd) {
+			if tv.RequestDeleteRange.PrevKv && !aa.as.IsRangePermitted(aa.user, tv.RequestDeleteRange.Key, tv.RequestDeleteRange.RangeEnd) {
 				return false
 			}
 

etcdserver/etcdserverpb/rpc.pb.go

@@ -296,6 +296,9 @@ 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{} }
@@ -305,6 +308,8 @@ 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{} }
@@ -319,6 +324,13 @@ 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"`
@@ -326,10 +338,9 @@ 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 preserveKVs is set, the deleted KVs will be preserved for delete events
-	// The preserved KVs will be returned as response.
-	// It requires read permission to read the deleted KVs.
-	PreserveKVs bool `protobuf:"varint,3,opt,name=preserveKVs,proto3" json:"preserveKVs,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{} }
@@ -341,8 +352,8 @@ 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 preserveKVs is set in the request, the deleted KVs will be returned.
-	KVs []*mvccpb.KeyValue `protobuf:"bytes,3,rep,name=KVs,json=kVs" json:"KVs,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{} }
@@ -357,9 +368,9 @@ func (m *DeleteRangeResponse) GetHeader() *ResponseHeader {
 	return nil
 }
 
-func (m *DeleteRangeResponse) GetKVs() []*mvccpb.KeyValue {
+func (m *DeleteRangeResponse) GetPrevKvs() []*mvccpb.KeyValue {
 	if m != nil {
-		return m.KVs
+		return m.PrevKvs
 	}
 	return nil
 }
@@ -3809,6 +3820,16 @@ 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
 }
 
@@ -3837,6 +3858,16 @@ 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
 }
 
@@ -3867,10 +3898,10 @@ func (m *DeleteRangeRequest) MarshalTo(data []byte) (int, error) {
 		i = encodeVarintRpc(data, i, uint64(len(m.RangeEnd)))
 		i += copy(data[i:], m.RangeEnd)
 	}
-	if m.PreserveKVs {
+	if m.PrevKv {
 		data[i] = 0x18
 		i++
-		if m.PreserveKVs {
+		if m.PrevKv {
 			data[i] = 1
 		} else {
 			data[i] = 0
@@ -3899,19 +3930,19 @@ 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.KVs) > 0 {
-		for _, msg := range m.KVs {
+	if len(m.PrevKvs) > 0 {
+		for _, msg := range m.PrevKvs {
 			data[i] = 0x1a
 			i++
 			i = encodeVarintRpc(data, i, uint64(msg.Size()))
@@ -3941,11 +3972,11 @@ 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
 }
@@ -3956,11 +3987,11 @@ 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
 }
@@ -3970,11 +4001,11 @@ 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
 }
@@ -3984,11 +4015,11 @@ 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
 }
@@ -4008,11 +4039,11 @@ 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
 }
@@ -4023,11 +4054,11 @@ 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
 }
@@ -4037,11 +4068,11 @@ 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
 }
@@ -4051,11 +4082,11 @@ 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
 }
@@ -4091,11 +4122,11 @@ 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
 }
@@ -4204,11 +4235,11 @@ 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
@@ -4287,11 +4318,11 @@ 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
 }
@@ -4333,11 +4364,11 @@ 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
@@ -4384,11 +4415,11 @@ 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
@@ -4420,11 +4451,11 @@ 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
 }
@@ -4435,11 +4466,11 @@ 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
 }
@@ -4449,11 +4480,11 @@ 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
 }
@@ -4561,11 +4592,11 @@ 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
@@ -4659,11 +4690,11 @@ 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
@@ -4726,11 +4757,11 @@ 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
 }
@@ -4777,11 +4808,11 @@ 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
@@ -4907,21 +4938,21 @@ 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
 }
@@ -4968,11 +4999,11 @@ 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
 }
@@ -5034,11 +5065,11 @@ 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
 }
@@ -5080,11 +5111,11 @@ 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 {
@@ -5138,11 +5169,11 @@ 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
 }
@@ -5227,11 +5258,11 @@ 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 {
@@ -5285,11 +5316,11 @@ 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
@@ -5687,11 +5718,11 @@ 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
 }
@@ -5751,11 +5782,11 @@ 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
 }
@@ -5779,11 +5810,11 @@ 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
 }
@@ -5807,11 +5838,11 @@ 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
@@ -5841,11 +5872,11 @@ 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
 }
@@ -5869,11 +5900,11 @@ 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 {
@@ -5912,11 +5943,11 @@ 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
 }
@@ -5940,11 +5971,11 @@ 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
 }
@@ -5968,11 +5999,11 @@ 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
 }
@@ -5996,11 +6027,11 @@ 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
 }
@@ -6024,11 +6055,11 @@ 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
 }
@@ -6052,11 +6083,11 @@ 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 {
@@ -6092,11 +6123,11 @@ 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 {
@@ -6135,11 +6166,11 @@ 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 {
@@ -6178,11 +6209,11 @@ 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
 }
@@ -6206,11 +6237,11 @@ 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
 }
@@ -6234,11 +6265,11 @@ 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
 }
@@ -6359,6 +6390,9 @@ func (m *PutRequest) Size() (n int) {
 	if m.Lease != 0 {
 		n += 1 + sovRpc(uint64(m.Lease))
 	}
+	if m.PrevKv {
+		n += 2
+	}
 	return n
 }
 
@@ -6369,6 +6403,10 @@ 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
 }
 
@@ -6383,7 +6421,7 @@ func (m *DeleteRangeRequest) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovRpc(uint64(l))
 	}
-	if m.PreserveKVs {
+	if m.PrevKv {
 		n += 2
 	}
 	return n
@@ -6399,8 +6437,8 @@ func (m *DeleteRangeResponse) Size() (n int) {
 	if m.Deleted != 0 {
 		n += 1 + sovRpc(uint64(m.Deleted))
 	}
-	if len(m.KVs) > 0 {
-		for _, e := range m.KVs {
+	if len(m.PrevKvs) > 0 {
+		for _, e := range m.PrevKvs {
 			l = e.Size()
 			n += 1 + l + sovRpc(uint64(l))
 		}
@@ -8023,6 +8061,26 @@ 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:])
@@ -8106,6 +8164,39 @@ 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:])
@@ -8220,7 +8311,7 @@ func (m *DeleteRangeRequest) Unmarshal(data []byte) error {
 			iNdEx = postIndex
 		case 3:
 			if wireType != 0 {
-				return fmt.Errorf("proto: wrong wireType = %d for field PreserveKVs", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field PrevKv", wireType)
 			}
 			var v int
 			for shift := uint(0); ; shift += 7 {
@@ -8237,7 +8328,7 @@ func (m *DeleteRangeRequest) Unmarshal(data []byte) error {
 					break
 				}
 			}
-			m.PreserveKVs = bool(v != 0)
+			m.PrevKv = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRpc(data[iNdEx:])
@@ -8342,7 +8433,7 @@ func (m *DeleteRangeResponse) Unmarshal(data []byte) error {
 			}
 		case 3:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field KVs", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field PrevKvs", wireType)
 			}
 			var msglen int
 			for shift := uint(0); ; shift += 7 {
@@ -8366,8 +8457,8 @@ func (m *DeleteRangeResponse) Unmarshal(data []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.KVs = append(m.KVs, &mvccpb.KeyValue{})
-			if err := m.KVs[len(m.KVs)-1].Unmarshal(data[iNdEx:postIndex]); err != nil {
+			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
@@ -15316,206 +15407,207 @@ var (
 )
 
 var fileDescriptorRpc = []byte{
-	// 3207 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xb4, 0x1a, 0x4d, 0x73, 0x23, 0x57,
-	0x71, 0x47, 0xb2, 0x25, 0xab, 0x25, 0x6b, 0xbd, 0xcf, 0xde, 0x8d, 0x3c, 0xeb, 0xf5, 0x7a, 0xdf,
-	0x7e, 0xe6, 0xcb, 0x22, 0x4e, 0xe0, 0x00, 0x54, 0xaa, 0x64, 0x4b, 0xd9, 0x18, 0x3b, 0xf6, 0x66,
-	0xac, 0x75, 0x42, 0x15, 0x85, 0x6b, 0x2c, 0xcd, 0xda, 0x2a, 0xeb, 0x2b, 0x33, 0x23, 0xed, 0x7a,
-	0x81, 0x2a, 0x2a, 0x45, 0x0e, 0xe1, 0x9a, 0x03, 0x45, 0x38, 0xf2, 0x1b, 0xb8, 0xf1, 0x03, 0x28,
-	0x2e, 0xa4, 0x8a, 0x23, 0x17, 0x8a, 0xe2, 0xc0, 0x81, 0x3b, 0xc5, 0x09, 0xde, 0xe7, 0xcc, 0x9b,
-	0xd1, 0x1b, 0xd9, 0x61, 0xc8, 0x61, 0xd7, 0xf3, 0xfa, 0xf5, 0xeb, 0xee, 0xd7, 0xaf, 0xbb, 0x5f,
-	0x77, 0x3f, 0x41, 0xc1, 0x1d, 0xb6, 0xd6, 0x87, 0xee, 0xc0, 0x1f, 0xa0, 0x92, 0xe3, 0xb7, 0xda,
-	0x9e, 0xe3, 0x8e, 0x1d, 0x77, 0x78, 0x6c, 0x2e, 0x9d, 0x0c, 0x4e, 0x06, 0x6c, 0xa2, 0x4a, 0xbf,
-	0x38, 0x8e, 0xb9, 0x4c, 0x71, 0xaa, 0xbd, 0x71, 0xab, 0xc5, 0xfe, 0x1b, 0x1e, 0x57, 0xcf, 0xc6,
-	0x62, 0xea, 0x26, 0x9b, 0xb2, 0x47, 0xfe, 0x29, 0xfb, 0x8f, 0x4c, 0xd1, 0x3f, 0x62, 0x72, 0xe5,
-	0x64, 0x30, 0x38, 0xe9, 0x3a, 0x55, 0x7b, 0xd8, 0xa9, 0xda, 0xfd, 0xfe, 0xc0, 0xb7, 0xfd, 0xce,
-	0xa0, 0xef, 0xf1, 0x59, 0xfc, 0x99, 0x01, 0x65, 0xcb, 0xf1, 0x86, 0x04, 0xe2, 0xbc, 0xef, 0xd8,
-	0x6d, 0xc7, 0x45, 0xb7, 0x00, 0x5a, 0xdd, 0x91, 0xe7, 0x3b, 0xee, 0x51, 0xa7, 0x5d, 0x31, 0xd6,
-	0x8c, 0x47, 0x33, 0x56, 0x41, 0x40, 0xb6, 0xdb, 0xe8, 0x26, 0x14, 0x7a, 0x4e, 0xef, 0x98, 0xcf,
-	0x66, 0xd8, 0xec, 0x1c, 0x07, 0x90, 0x49, 0x13, 0xe6, 0x5c, 0x67, 0xdc, 0xf1, 0x08, 0x87, 0x4a,
-	0x96, 0xcc, 0x65, 0xad, 0x60, 0x4c, 0x17, 0xba, 0xf6, 0x33, 0xff, 0x88, 0x90, 0xe9, 0x55, 0x66,
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+	0x39, 0xd1, 0xcd, 0x8a, 0xef, 0x73, 0xb2, 0x6d, 0x85, 0x6f, 0x33, 0xce, 0x4b, 0x78, 0x31, 0xe0,
+	0xcc, 0x9e, 0x7b, 0x6b, 0xc7, 0x14, 0x8b, 0xaa, 0xf5, 0x05, 0x94, 0x94, 0x1e, 0x12, 0xd2, 0x51,
+	0x8c, 0x34, 0xa1, 0xe2, 0x46, 0xa0, 0x69, 0x40, 0xe1, 0xbb, 0x8c, 0xe9, 0x2d, 0x5c, 0x55, 0x95,
+	0xcb, 0xf9, 0xba, 0x0c, 0x93, 0x32, 0xfe, 0x29, 0x29, 0x89, 0xa2, 0x7d, 0x24, 0x74, 0x57, 0x43,
+	0x3a, 0xde, 0x8e, 0x32, 0xef, 0x4d, 0x47, 0x4a, 0x14, 0x81, 0xf3, 0x3f, 0x25, 0x98, 0x36, 0xc5,
+	0x94, 0xba, 0xff, 0x37, 0x7d, 0x92, 0xe3, 0x3f, 0x08, 0x41, 0x3e, 0x14, 0x83, 0x6e, 0x0e, 0x5a,
+	0xd1, 0x55, 0xfa, 0x61, 0x1a, 0x6c, 0xde, 0x4e, 0x9c, 0x17, 0x22, 0x3c, 0x60, 0x22, 0xac, 0xe2,
+	0x9b, 0x81, 0x08, 0xe2, 0x87, 0x27, 0x35, 0x5e, 0xd0, 0xd6, 0xec, 0x4e, 0x87, 0x2a, 0xe2, 0x27,
+	0xa4, 0xa4, 0x57, 0x9b, 0x34, 0xe8, 0x8e, 0xb6, 0xc7, 0xa0, 0xf6, 0x79, 0x4c, 0x3c, 0x0d, 0x45,
+	0xf0, 0x7f, 0x95, 0xf1, 0xbf, 0x8b, 0x57, 0x92, 0xf8, 0xbb, 0x0c, 0x3f, 0x2a, 0x02, 0x6f, 0xcb,
+	0xe8, 0x45, 0x88, 0x74, 0x7d, 0xf4, 0x22, 0x44, 0xbb, 0x3a, 0x17, 0x8b, 0x30, 0x66, 0xf8, 0x54,
+	0x84, 0x97, 0x00, 0x61, 0xd7, 0x06, 0x69, 0x95, 0xab, 0x14, 0x06, 0x71, 0xcb, 0x9f, 0x6c, 0xf8,
+	0xe0, 0x87, 0x8c, 0xf7, 0x1d, 0xbc, 0x9c, 0xc4, 0xbb, 0x47, 0xb0, 0xa9, 0x9f, 0xff, 0x2e, 0x07,
+	0xa5, 0xf7, 0xed, 0xee, 0xc0, 0x77, 0x06, 0xb4, 0x19, 0x8d, 0x8e, 0x61, 0x86, 0x45, 0xfe, 0xb8,
+	0xbb, 0xab, 0xad, 0x94, 0xb8, 0xbb, 0x47, 0xfa, 0x0c, 0xf8, 0x3e, 0x63, 0x7d, 0x1b, 0x9b, 0x01,
+	0xeb, 0x7e, 0x48, 0xbf, 0xc6, 0x7a, 0x04, 0x74, 0xcb, 0xa7, 0x90, 0xe7, 0x3d, 0x01, 0x14, 0xa3,
+	0x16, 0xe9, 0x1d, 0x98, 0xcb, 0xfa, 0xc9, 0x44, 0x2b, 0x53, 0x79, 0x79, 0x0c, 0x99, 0x32, 0xfb,
+	0x21, 0x40, 0xd8, 0x84, 0x8a, 0xeb, 0x77, 0xa2, 0x67, 0x65, 0xae, 0x26, 0x23, 0x08, 0xc6, 0xaf,
+	0x31, 0xc6, 0xf7, 0xf0, 0x6d, 0x2d, 0xe3, 0x4e, 0xb0, 0x80, 0x32, 0x6f, 0x43, 0x8e, 0x3e, 0xb8,
+	0xa1, 0x58, 0xe8, 0x57, 0xde, 0xe4, 0x4c, 0x53, 0x37, 0x25, 0x58, 0xdd, 0x63, 0xac, 0x56, 0xf0,
+	0x92, 0x96, 0x15, 0x7d, 0x78, 0xa3, 0x4c, 0xc6, 0x30, 0x2b, 0xdf, 0xd9, 0xd0, 0xad, 0x98, 0xce,
+	0xa2, 0x6f, 0x72, 0xe6, 0x4a, 0xd2, 0xb4, 0x60, 0xf8, 0x88, 0x31, 0xc4, 0xf8, 0x96, 0x5e, 0xa9,
+	0x02, 0x9d, 0x30, 0x25, 0x01, 0xe4, 0xe7, 0xf3, 0x90, 0xa3, 0x39, 0x08, 0x8d, 0xdd, 0x61, 0xe9,
+	0x16, 0xd7, 0xf0, 0x44, 0xc3, 0x24, 0xae, 0xe1, 0xc9, 0xaa, 0x4f, 0x13, 0xbb, 0xd9, 0xcf, 0xe2,
+	0x1c, 0x86, 0x45, 0x77, 0xec, 0x43, 0x49, 0x29, 0xf0, 0x90, 0x86, 0x62, 0xb4, 0x1d, 0x13, 0x8f,
+	0xdd, 0x9a, 0xea, 0x10, 0xaf, 0x32, 0xa6, 0x26, 0xbe, 0x1e, 0x65, 0xda, 0xe1, 0x68, 0x94, 0xeb,
+	0x8f, 0xa0, 0xac, 0x56, 0x82, 0x48, 0x43, 0x34, 0xd6, 0xef, 0x89, 0xc7, 0x0a, 0x5d, 0x21, 0xa9,
+	0x71, 0x9a, 0xe0, 0x47, 0x80, 0x12, 0x97, 0x72, 0xff, 0x04, 0x0a, 0xa2, 0x3e, 0xd4, 0xed, 0x37,
+	0xda, 0x21, 0xd2, 0xed, 0x37, 0x56, 0x5c, 0x6a, 0x12, 0x01, 0xc6, 0x96, 0xe6, 0xc1, 0x32, 0x40,
+	0x0b, 0x96, 0xa4, 0x8c, 0x48, 0x62, 0x19, 0xf6, 0x3c, 0x92, 0x58, 0x2a, 0x35, 0xc8, 0x54, 0x96,
+	0xc7, 0x8e, 0x2f, 0x6c, 0x59, 0x26, 0xf8, 0x28, 0x81, 0xa2, 0x1a, 0x0d, 0xf1, 0x34, 0x14, 0xc1,
+	0x15, 0x33, 0xae, 0xcb, 0xf8, 0x15, 0x0d, 0x57, 0x11, 0x0a, 0xd1, 0x8f, 0x01, 0xc2, 0x62, 0x36,
+	0x7e, 0x1d, 0x6b, 0x3b, 0x62, 0xf1, 0xeb, 0x58, 0x5f, 0x0f, 0x6b, 0x3c, 0x38, 0x64, 0xce, 0x7f,
+	0x6d, 0x43, 0xd9, 0xff, 0xd2, 0x00, 0x34, 0x59, 0xfc, 0xa2, 0xc7, 0x7a, 0x16, 0xda, 0x66, 0x9b,
+	0xf9, 0xfa, 0xe5, 0x90, 0x13, 0xa3, 0x67, 0x28, 0x57, 0x9b, 0x2d, 0x19, 0xbd, 0xa0, 0x92, 0x7d,
+	0x6e, 0xc0, 0x5c, 0xa4, 0x7c, 0x46, 0x0f, 0x12, 0xce, 0x39, 0xd6, 0xb0, 0x33, 0x1f, 0x5e, 0x88,
+	0x97, 0x98, 0xb1, 0x28, 0x56, 0x21, 0xb3, 0xb5, 0x9f, 0x91, 0xa4, 0x29, 0x5a, 0x73, 0xa3, 0x04,
+	0x06, 0x13, 0x5d, 0x3f, 0xf3, 0xd1, 0xc5, 0x88, 0x97, 0x38, 0xad, 0x30, 0x81, 0x23, 0x6e, 0x21,
+	0x4a, 0x75, 0x9d, 0x5b, 0x44, 0x9b, 0x86, 0x3a, 0xb7, 0x88, 0xd5, 0xf9, 0x49, 0x6e, 0x41, 0xab,
+	0x5e, 0xc5, 0x13, 0x45, 0x41, 0x9f, 0xc4, 0x72, 0xba, 0x27, 0xc6, 0xba, 0x01, 0x53, 0x59, 0x86,
+	0x9e, 0x28, 0xcb, 0x79, 0x94, 0x40, 0xf1, 0x02, 0x4f, 0x8c, 0x77, 0x03, 0x92, 0x3c, 0x91, 0x71,
+	0x55, 0x3c, 0x31, 0xac, 0xbe, 0x75, 0x9e, 0x38, 0xd1, 0x12, 0xd5, 0x79, 0xe2, 0x64, 0x01, 0x9f,
+	0x74, 0xb6, 0x8c, 0x79, 0xc4, 0x13, 0x17, 0x34, 0xd5, 0x3a, 0x7a, 0x3d, 0x41, 0xa7, 0xda, 0x76,
+	0xab, 0xf9, 0xc6, 0x25, 0xb1, 0xa7, 0x7b, 0x00, 0x3f, 0x0d, 0xe9, 0x01, 0xbf, 0x36, 0x60, 0x51,
+	0x57, 0xee, 0xa3, 0x04, 0x66, 0x09, 0xbd, 0x5a, 0x73, 0xed, 0xb2, 0xe8, 0x97, 0xd0, 0x5b, 0xe0,
+	0x13, 0x1b, 0xe5, 0xdf, 0xff, 0x75, 0xc5, 0xf8, 0x8a, 0xfc, 0xfb, 0x0b, 0xf9, 0x77, 0x94, 0x67,
+	0xbf, 0x4b, 0x7f, 0xeb, 0x3f, 0x01, 0x00, 0x00, 0xff, 0xff, 0x6f, 0xc2, 0x22, 0x9e, 0x1e, 0x2f,
+	0x00, 0x00,
 }

etcdserver/etcdserverpb/rpc.proto

@@ -391,10 +391,16 @@ 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 {
@@ -405,18 +411,17 @@ message DeleteRangeRequest {
   // If range_end is '\0', the range is all keys greater than or equal to the key argument.
   bytes range_end = 2;
 
-  // If preserveKVs is set, the deleted KVs will be preserved for delete events
-  // The preserved KVs will be returned as response.
-  // It requires read permission to read the deleted KVs.
-  bool preserveKVs = 3;
+  // 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 preserveKVs is set in the request, the deleted KVs will be returned.
-  repeated mvccpb.KeyValue KVs = 3;
+  // if prev_kv is set in the request, the previous key-value pairs will be returned.
+  repeated mvccpb.KeyValue prev_kvs = 3;
 }
 
 message RequestOp {

integration/v3_grpc_test.go

@@ -376,10 +376,10 @@ func TestV3PutMissingLease(t *testing.T) {
 func TestV3DeleteRange(t *testing.T) {
 	defer testutil.AfterTest(t)
 	tests := []struct {
-		keySet      []string
-		begin       string
-		end         string
-		preserveKVs bool
+		keySet []string
+		begin  string
+		end    string
+		prevKV bool
 
 		wantSet [][]byte
 		deleted int64
@@ -442,9 +442,9 @@ func TestV3DeleteRange(t *testing.T) {
 		}
 
 		dreq := &pb.DeleteRangeRequest{
-			Key:         []byte(tt.begin),
-			RangeEnd:    []byte(tt.end),
-			PreserveKVs: tt.preserveKVs,
+			Key:      []byte(tt.begin),
+			RangeEnd: []byte(tt.end),
+			PrevKv:   tt.prevKV,
 		}
 		dresp, err := kvc.DeleteRange(context.TODO(), dreq)
 		if err != nil {
@@ -453,9 +453,9 @@ func TestV3DeleteRange(t *testing.T) {
 		if tt.deleted != dresp.Deleted {
 			t.Errorf("expected %d on test %v, got %d", tt.deleted, i, dresp.Deleted)
 		}
-		if tt.preserveKVs {
-			if len(dresp.KVs) != int(dresp.Deleted) {
-				t.Errorf("preserve %d keys, want %d", len(dresp.KVs), dresp.Deleted)
+		if tt.prevKV {
+			if len(dresp.PrevKvs) != int(dresp.Deleted) {
+				t.Errorf("preserve %d keys, want %d", len(dresp.PrevKvs), dresp.Deleted)
 			}
 		}