diff --git a/tools/functional-tester/rpcpb/rpc.pb.go b/tools/functional-tester/rpcpb/rpc.pb.go
index f28d0b8d3..2ff92826c 100644
--- a/tools/functional-tester/rpcpb/rpc.pb.go
+++ b/tools/functional-tester/rpcpb/rpc.pb.go
@@ -259,12 +259,14 @@ type Tester struct {
 	EnablePprof bool `protobuf:"varint,24,opt,name=EnablePprof,proto3" json:"EnablePprof,omitempty" yaml:"enable-pprof"`
 	// FailureCases is the selected test cases to schedule.
 	// If empty, run all failure cases.
-	// TODO: support no-op
 	FailureCases []string `protobuf:"bytes,31,rep,name=FailureCases" json:"FailureCases,omitempty" yaml:"failure-cases"`
+	// FailureDelayMs is the delay duration after failure is injected.
+	// Useful when triggering snapshot or no-op failure cases.
+	FailureDelayMs uint32 `protobuf:"varint,32,opt,name=FailureDelayMs,proto3" json:"FailureDelayMs,omitempty" yaml:"failure-delay-ms"`
 	// FailureShuffle is true to randomize failure injecting order.
-	FailureShuffle bool `protobuf:"varint,32,opt,name=FailureShuffle,proto3" json:"FailureShuffle,omitempty" yaml:"failure-shuffle"`
+	FailureShuffle bool `protobuf:"varint,33,opt,name=FailureShuffle,proto3" json:"FailureShuffle,omitempty" yaml:"failure-shuffle"`
 	// FailpointCommands is the list of "gofail" commands (e.g. panic("etcd-tester"),1*sleep(1000)).
-	FailpointCommands []string `protobuf:"bytes,33,rep,name=FailpointCommands" json:"FailpointCommands,omitempty" yaml:"failpoint-commands"`
+	FailpointCommands []string `protobuf:"bytes,34,rep,name=FailpointCommands" json:"FailpointCommands,omitempty" yaml:"failpoint-commands"`
 	// RunnerExecPath is a path of etcd-runner binary.
 	RunnerExecPath string `protobuf:"bytes,41,opt,name=RunnerExecPath,proto3" json:"RunnerExecPath,omitempty" yaml:"runner-exec-path"`
 	// ExternalExecPath is a path of script for enabling/disabling an external fault injector.
@@ -781,11 +783,18 @@ func (m *Tester) MarshalTo(dAtA []byte) (int, error) {
 			i += copy(dAtA[i:], s)
 		}
 	}
-	if m.FailureShuffle {
+	if m.FailureDelayMs != 0 {
 		dAtA[i] = 0x80
 		i++
 		dAtA[i] = 0x2
 		i++
+		i = encodeVarintRpc(dAtA, i, uint64(m.FailureDelayMs))
+	}
+	if m.FailureShuffle {
+		dAtA[i] = 0x88
+		i++
+		dAtA[i] = 0x2
+		i++
 		if m.FailureShuffle {
 			dAtA[i] = 1
 		} else {
@@ -795,7 +804,7 @@ func (m *Tester) MarshalTo(dAtA []byte) (int, error) {
 	}
 	if len(m.FailpointCommands) > 0 {
 		for _, s := range m.FailpointCommands {
-			dAtA[i] = 0x8a
+			dAtA[i] = 0x92
 			i++
 			dAtA[i] = 0x2
 			i++
@@ -1125,6 +1134,9 @@ func (m *Tester) Size() (n int) {
 			n += 2 + l + sovRpc(uint64(l))
 		}
 	}
+	if m.FailureDelayMs != 0 {
+		n += 2 + sovRpc(uint64(m.FailureDelayMs))
+	}
 	if m.FailureShuffle {
 		n += 3
 	}
@@ -2184,6 +2196,25 @@ func (m *Tester) Unmarshal(dAtA []byte) error {
 			m.FailureCases = append(m.FailureCases, string(dAtA[iNdEx:postIndex]))
 			iNdEx = postIndex
 		case 32:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field FailureDelayMs", wireType)
+			}
+			m.FailureDelayMs = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRpc
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.FailureDelayMs |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 33:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field FailureShuffle", wireType)
 			}
@@ -2203,7 +2234,7 @@ func (m *Tester) Unmarshal(dAtA []byte) error {
 				}
 			}
 			m.FailureShuffle = bool(v != 0)
-		case 33:
+		case 34:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field FailpointCommands", wireType)
 			}
@@ -2815,121 +2846,122 @@ var (
 func init() { proto.RegisterFile("rpcpb/rpc.proto", fileDescriptorRpc) }
 
 var fileDescriptorRpc = []byte{
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+	0x35, 0xfe, 0x58, 0xed, 0x51, 0x39, 0x61, 0x50, 0xb2, 0x3a, 0xfb, 0x47, 0x46, 0x09, 0x1e, 0xee,
+	0x00, 0x50, 0x8a, 0x58, 0x95, 0xb9, 0x84, 0xe1, 0xa6, 0xb6, 0x04, 0xf7, 0x81, 0x96, 0x3c, 0xc5,
+	0x84, 0x8d, 0xcf, 0x3e, 0x2d, 0x03, 0x77, 0xc1, 0x26, 0xc2, 0x74, 0x62, 0x58, 0x86, 0x5b, 0x60,
+	0xe3, 0xda, 0x0f, 0x02, 0xb1, 0x5a, 0xe1, 0x6e, 0xde, 0x09, 0xf2, 0xc4, 0xeb, 0xf8, 0x77, 0x58,
+	0x5b, 0xe5, 0x2a, 0x17, 0x98, 0x32, 0x12, 0x0d, 0x38, 0x42, 0x3c, 0xa9, 0xb4, 0x2c, 0x7c, 0x04,
+	0x0e, 0x0a, 0x81, 0xeb, 0xdd, 0x76, 0xa2, 0x40, 0x3c, 0xf1, 0x2b, 0x11, 0x61, 0xb5, 0x3e, 0xea,
+	0x6b, 0x4d, 0xf8, 0x18, 0x1c, 0xde, 0x84, 0x8d, 0x85, 0x4e, 0x0c, 0x0f, 0xc0, 0x03, 0xd1, 0xef,
+	0x52, 0xe6, 0x16, 0x3c, 0x04, 0x7b, 0x37, 0x61, 0x73, 0xce, 0xd1, 0x3e, 0xfb, 0xdb, 0x8a, 0x8c,
+	0x27, 0x69, 0xb5, 0x9c, 0x7f, 0x7d, 0xe5, 0x38, 0xf5, 0x72, 0xc9, 0xae, 0xbf, 0x2a, 0x3b, 0x4e,
+	0xf9, 0x9d, 0x8d, 0xb4, 0x25, 0x1e, 0xb5, 0x30, 0x3b, 0x76, 0xfe, 0xc2, 0x46, 0x5a, 0x06, 0x1e,
+	0x83, 0xa3, 0x39, 0x5c, 0xfd, 0x55, 0x19, 0xd5, 0x9d, 0x72, 0xe9, 0x1b, 0x6d, 0x19, 0xea, 0x60,
+	0x5f, 0x21, 0x4c, 0x3d, 0x2b, 0x13, 0xa9, 0x37, 0x37, 0x65, 0x74, 0xf3, 0x5a, 0x5b, 0x15, 0xf9,
+	0xe1, 0x86, 0xbc, 0xe3, 0x68, 0x59, 0x78, 0x06, 0x9e, 0x15, 0x9c, 0x7c, 0xf1, 0xfa, 0xb2, 0xec,
+	0xd8, 0xf5, 0x8a, 0x6d, 0xa3, 0x7a, 0xa5, 0x8c, 0x6a, 0xf5, 0xda, 0xfb, 0x3a, 0x7a, 0x9f, 0x8e,
+	0x6a, 0x0d, 0xfe, 0x00, 0x9c, 0xdc, 0x8f, 0x4d, 0x42, 0x5d, 0x87, 0x9f, 0x81, 0xa7, 0xf7, 0xa3,
+	0xf8, 0x47, 0x37, 0xe0, 0x33, 0x60, 0x5e, 0xd8, 0x4e, 0xfe, 0xd7, 0xff, 0xfb, 0x83, 0x39, 0x78,
+	0x02, 0x9e, 0x2c, 0xc6, 0x25, 0x1f, 0x03, 0xf0, 0x29, 0x78, 0xb4, 0x18, 0xc1, 0x3f, 0xb4, 0xc9,
+	0xcf, 0xa1, 0x54, 0xae, 0xbf, 0xca, 0x5f, 0x39, 0xf5, 0x77, 0x57, 0xb5, 0xcb, 0x7a, 0xb5, 0x86,
+	0xec, 0x6a, 0x55, 0x6b, 0xc2, 0x1f, 0x82, 0xcf, 0x53, 0x8e, 0x52, 0x39, 0xf1, 0xc9, 0xd4, 0x5d,
+	0xbd, 0xb5, 0x4b, 0x1c, 0x88, 0xe1, 0x2e, 0x00, 0x1c, 0x55, 0x29, 0x5f, 0x95, 0x6a, 0x55, 0xed,
+	0x63, 0x06, 0x6e, 0x83, 0x0d, 0xfb, 0x7d, 0xcd, 0x46, 0xa5, 0xbc, 0xa3, 0xfd, 0x71, 0xf9, 0x2c,
+	0x02, 0x60, 0xda, 0x98, 0xe1, 0x1a, 0x58, 0xbe, 0x7e, 0xab, 0x2d, 0xc1, 0x1c, 0xc8, 0x3a, 0x76,
+	0xbe, 0x6a, 0x6b, 0x19, 0xb8, 0x07, 0x76, 0x6d, 0xc7, 0x2e, 0xd6, 0xae, 0xca, 0xa5, 0x3a, 0xba,
+	0x29, 0x95, 0x6c, 0xa4, 0x2d, 0x43, 0x0d, 0x6c, 0xbd, 0xcb, 0xd7, 0x8a, 0x97, 0x63, 0xcb, 0x0a,
+	0xbf, 0x08, 0x4e, 0xb9, 0x78, 0x5d, 0x47, 0xf9, 0xa2, 0x8d, 0xc6, 0xe6, 0x55, 0x0e, 0x14, 0x42,
+	0x63, 0x4b, 0xf6, 0xc5, 0x4b, 0x90, 0xab, 0x11, 0x37, 0xa4, 0x71, 0x44, 0x18, 0x7c, 0xa1, 0x2e,
+	0x76, 0x92, 0x92, 0x4c, 0x3a, 0xc1, 0xd1, 0xee, 0x64, 0x2d, 0x0b, 0xd2, 0x5c, 0x3a, 0xcd, 0xfc,
+	0x38, 0x53, 0xd8, 0xff, 0xf8, 0xaf, 0xe3, 0xa5, 0x8f, 0x9f, 0x8e, 0x33, 0x7f, 0xff, 0x74, 0x9c,
+	0xf9, 0xe7, 0xa7, 0xe3, 0xcc, 0x1f, 0xfe, 0x7d, 0xbc, 0xd4, 0x58, 0x13, 0xff, 0xa6, 0xf8, 0xf2,
+	0xbf, 0x01, 0x00, 0x00, 0xff, 0xff, 0x33, 0x62, 0x54, 0x24, 0xef, 0x10, 0x00, 0x00,
 }
diff --git a/tools/functional-tester/rpcpb/rpc.proto b/tools/functional-tester/rpcpb/rpc.proto
index 80d89c58e..cbe206d56 100644
--- a/tools/functional-tester/rpcpb/rpc.proto
+++ b/tools/functional-tester/rpcpb/rpc.proto
@@ -141,12 +141,14 @@ message Tester {
 
   // FailureCases is the selected test cases to schedule.
   // If empty, run all failure cases.
-  // TODO: support no-op
   repeated string FailureCases = 31 [(gogoproto.moretags) = "yaml:\"failure-cases\""];
+  // FailureDelayMs is the delay duration after failure is injected.
+  // Useful when triggering snapshot or no-op failure cases.
+  uint32 FailureDelayMs = 32 [(gogoproto.moretags) = "yaml:\"failure-delay-ms\""];
   // FailureShuffle is true to randomize failure injecting order.
-  bool FailureShuffle = 32 [(gogoproto.moretags) = "yaml:\"failure-shuffle\""];
+  bool FailureShuffle = 33 [(gogoproto.moretags) = "yaml:\"failure-shuffle\""];
   // FailpointCommands is the list of "gofail" commands (e.g. panic("etcd-tester"),1*sleep(1000)).
-  repeated string FailpointCommands = 33 [(gogoproto.moretags) = "yaml:\"failpoint-commands\""];
+  repeated string FailpointCommands = 34 [(gogoproto.moretags) = "yaml:\"failpoint-commands\""];
 
   // RunnerExecPath is a path of etcd-runner binary.
   string RunnerExecPath = 41 [(gogoproto.moretags) = "yaml:\"runner-exec-path\""];