diff --git a/pkg/apis/proto/sink/v1/sink.pb.go b/pkg/apis/proto/sink/v1/sink.pb.go
index e0ccb0cc..8a6b051e 100644
--- a/pkg/apis/proto/sink/v1/sink.pb.go
+++ b/pkg/apis/proto/sink/v1/sink.pb.go
@@ -295,9 +295,9 @@ type SinkResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Result    *SinkResponse_Result `protobuf:"bytes,1,opt,name=result,proto3" json:"result,omitempty"`
-	Handshake *Handshake           `protobuf:"bytes,2,opt,name=handshake,proto3,oneof" json:"handshake,omitempty"`
-	Status    *TransmissionStatus  `protobuf:"bytes,3,opt,name=status,proto3,oneof" json:"status,omitempty"`
+	Results   []*SinkResponse_Result `protobuf:"bytes,1,rep,name=results,proto3" json:"results,omitempty"`
+	Handshake *Handshake             `protobuf:"bytes,2,opt,name=handshake,proto3,oneof" json:"handshake,omitempty"`
+	Status    *TransmissionStatus    `protobuf:"bytes,3,opt,name=status,proto3,oneof" json:"status,omitempty"`
 }
 
 func (x *SinkResponse) Reset() {
@@ -332,9 +332,9 @@ func (*SinkResponse) Descriptor() ([]byte, []int) {
 	return file_pkg_apis_proto_sink_v1_sink_proto_rawDescGZIP(), []int{4}
 }
 
-func (x *SinkResponse) GetResult() *SinkResponse_Result {
+func (x *SinkResponse) GetResults() []*SinkResponse_Result {
 	if x != nil {
-		return x.Result
+		return x.Results
 	}
 	return nil
 }
@@ -554,41 +554,41 @@ var file_pkg_apis_proto_sink_v1_sink_proto_rawDesc = []byte{
 	0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52, 0x05, 0x72, 0x65, 0x61, 0x64, 0x79, 0x22, 0x26,
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+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -622,7 +622,7 @@ var file_pkg_apis_proto_sink_v1_sink_proto_depIdxs = []int32{
 	6,  // 0: sink.v1.SinkRequest.request:type_name -> sink.v1.SinkRequest.Request
 	4,  // 1: sink.v1.SinkRequest.status:type_name -> sink.v1.TransmissionStatus
 	2,  // 2: sink.v1.SinkRequest.handshake:type_name -> sink.v1.Handshake
-	8,  // 3: sink.v1.SinkResponse.result:type_name -> sink.v1.SinkResponse.Result
+	8,  // 3: sink.v1.SinkResponse.results:type_name -> sink.v1.SinkResponse.Result
 	2,  // 4: sink.v1.SinkResponse.handshake:type_name -> sink.v1.Handshake
 	4,  // 5: sink.v1.SinkResponse.status:type_name -> sink.v1.TransmissionStatus
 	9,  // 6: sink.v1.SinkRequest.Request.event_time:type_name -> google.protobuf.Timestamp
diff --git a/pkg/apis/proto/sink/v1/sink.proto b/pkg/apis/proto/sink/v1/sink.proto
index d51c55d1..a042fa4d 100644
--- a/pkg/apis/proto/sink/v1/sink.proto
+++ b/pkg/apis/proto/sink/v1/sink.proto
@@ -80,7 +80,7 @@ message SinkResponse {
     // err_msg is the error message, set it if success is set to false.
     string err_msg = 3;
   }
-  Result result = 1;
+  repeated Result results = 1;
   optional Handshake handshake = 2;
   optional TransmissionStatus status = 3;
 }
\ No newline at end of file
diff --git a/pkg/apis/proto/source/v1/source.pb.go b/pkg/apis/proto/source/v1/source.pb.go
index 67a0c4d9..c69b85fe 100644
--- a/pkg/apis/proto/source/v1/source.pb.go
+++ b/pkg/apis/proto/source/v1/source.pb.go
@@ -848,7 +848,7 @@ type AckRequest_Request struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Required field holding the offset to be acked
-	Offset *Offset `protobuf:"bytes,1,opt,name=offset,proto3" json:"offset,omitempty"`
+	Offsets []*Offset `protobuf:"bytes,1,rep,name=offsets,proto3" json:"offsets,omitempty"`
 }
 
 func (x *AckRequest_Request) Reset() {
@@ -883,9 +883,9 @@ func (*AckRequest_Request) Descriptor() ([]byte, []int) {
 	return file_pkg_apis_proto_source_v1_source_proto_rawDescGZIP(), []int{3, 0}
 }
 
-func (x *AckRequest_Request) GetOffset() *Offset {
+func (x *AckRequest_Request) GetOffsets() []*Offset {
 	if x != nil {
-		return x.Offset
+		return x.Offsets
 	}
 	return nil
 }
@@ -1107,7 +1107,7 @@ var file_pkg_apis_proto_source_v1_source_proto_rawDesc = []byte{
 	0x45, 0x72, 0x72, 0x6f, 0x72, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x4e, 0x41, 0x43, 0x4b, 0x45, 0x44,
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 	0x0a, 0x0a, 0x41, 0x63, 0x6b, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x37, 0x0a, 0x07,
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@@ -1115,71 +1115,71 @@ var file_pkg_apis_proto_source_v1_source_proto_rawDesc = []byte{
 	0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x37, 0x0a, 0x09, 0x68, 0x61, 0x6e, 0x64, 0x73, 0x68, 0x61,
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+	0x6f, 0x6e, 0x73, 0x65, 0x12, 0x3b, 0x0a, 0x07, 0x49, 0x73, 0x52, 0x65, 0x61, 0x64, 0x79, 0x12,
+	0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x1a, 0x18, 0x2e, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65,
+	0x2e, 0x76, 0x31, 0x2e, 0x52, 0x65, 0x61, 0x64, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
+	0x65, 0x42, 0x3a, 0x5a, 0x38, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f,
+	0x6e, 0x75, 0x6d, 0x61, 0x70, 0x72, 0x6f, 0x6a, 0x2f, 0x6e, 0x75, 0x6d, 0x61, 0x66, 0x6c, 0x6f,
+	0x77, 0x2d, 0x67, 0x6f, 0x2f, 0x70, 0x6b, 0x67, 0x2f, 0x61, 0x70, 0x69, 0x73, 0x2f, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x2f, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x2f, 0x76, 0x31, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1236,7 +1236,7 @@ var file_pkg_apis_proto_source_v1_source_proto_depIdxs = []int32{
 	14, // 13: source.v1.ReadResponse.Result.headers:type_name -> source.v1.ReadResponse.Result.HeadersEntry
 	0,  // 14: source.v1.ReadResponse.Status.code:type_name -> source.v1.ReadResponse.Status.Code
 	1,  // 15: source.v1.ReadResponse.Status.error:type_name -> source.v1.ReadResponse.Status.Error
-	10, // 16: source.v1.AckRequest.Request.offset:type_name -> source.v1.Offset
+	10, // 16: source.v1.AckRequest.Request.offsets:type_name -> source.v1.Offset
 	20, // 17: source.v1.AckResponse.Result.success:type_name -> google.protobuf.Empty
 	3,  // 18: source.v1.Source.ReadFn:input_type -> source.v1.ReadRequest
 	5,  // 19: source.v1.Source.AckFn:input_type -> source.v1.AckRequest
diff --git a/pkg/apis/proto/source/v1/source.proto b/pkg/apis/proto/source/v1/source.proto
index 10371998..8cc8939b 100644
--- a/pkg/apis/proto/source/v1/source.proto
+++ b/pkg/apis/proto/source/v1/source.proto
@@ -113,7 +113,7 @@ message ReadResponse {
 message AckRequest {
   message Request {
     // Required field holding the offset to be acked
-    Offset offset = 1;
+    repeated Offset offsets = 1;
   }
   // Required field holding the request. The list will be ordered and will have the same order as the original Read response.
   Request request = 1;
diff --git a/pkg/sinker/service.go b/pkg/sinker/service.go
index 8a58ec6a..f1e3fb46 100644
--- a/pkg/sinker/service.go
+++ b/pkg/sinker/service.go
@@ -119,9 +119,6 @@ func (fs *Service) performHandshake(stream sinkpb.Sink_SinkFnServer) error {
 	}
 
 	handshakeResponse := &sinkpb.SinkResponse{
-		Result: &sinkpb.SinkResponse_Result{
-			Status: sinkpb.Status_SUCCESS,
-		},
 		Handshake: &sinkpb.Handshake{
 			Sot: true,
 		},
@@ -175,28 +172,33 @@ func (fs *Service) processData(ctx context.Context, stream sinkpb.Sink_SinkFnSer
 		}
 	}()
 	responses := fs.Sinker.Sink(ctx, datumStreamCh)
-	for _, response := range responses {
-		var status sinkpb.Status
-		if response.Fallback {
-			status = sinkpb.Status_FALLBACK
-		} else if response.Success {
-			status = sinkpb.Status_SUCCESS
-		} else {
-			status = sinkpb.Status_FAILURE
-		}
 
-		sinkResponse := &sinkpb.SinkResponse{
-			Result: &sinkpb.SinkResponse_Result{
-				Id:     response.ID,
-				Status: status,
-				ErrMsg: response.Err,
-			},
-		}
-		if err := stream.Send(sinkResponse); err != nil {
-			log.Printf("error sending sink response: %v", err)
-			return err
+	var resultList []*sinkpb.SinkResponse_Result
+	for _, msg := range responses {
+		if msg.Fallback {
+			resultList = append(resultList, &sinkpb.SinkResponse_Result{
+				Id:     msg.ID,
+				Status: sinkpb.Status_FALLBACK,
+			})
+		} else if msg.Success {
+			resultList = append(resultList, &sinkpb.SinkResponse_Result{
+				Id:     msg.ID,
+				Status: sinkpb.Status_SUCCESS,
+			})
+		} else {
+			resultList = append(resultList, &sinkpb.SinkResponse_Result{
+				Id:     msg.ID,
+				Status: sinkpb.Status_FAILURE,
+				ErrMsg: msg.Err,
+			})
 		}
 	}
+	if err := stream.Send(&sinkpb.SinkResponse{
+		Results: resultList,
+	}); err != nil {
+		log.Printf("error sending sink response: %v", err)
+		return err
+	}
 
 	select {
 	case <-ctx.Done():
diff --git a/pkg/sinker/service_test.go b/pkg/sinker/service_test.go
index 796bc79c..25917dc1 100644
--- a/pkg/sinker/service_test.go
+++ b/pkg/sinker/service_test.go
@@ -53,7 +53,6 @@ func TestService_SinkFn(t *testing.T) {
 
 			input: []*sinkpb.SinkRequest{
 				{
-					Request: &sinkpb.SinkRequest_Request{},
 					Handshake: &sinkpb.Handshake{
 						Sot: true,
 					},
@@ -89,8 +88,7 @@ func TestService_SinkFn(t *testing.T) {
 					},
 				},
 				{
-					Request: &sinkpb.SinkRequest_Request{},
-					Status:  &sinkpb.TransmissionStatus{Eot: true},
+					Status: &sinkpb.TransmissionStatus{Eot: true},
 				},
 			},
 			sh: SinkerFunc(func(ctx context.Context, rch <-chan Datum) Responses {
@@ -103,30 +101,27 @@ func TestService_SinkFn(t *testing.T) {
 			}),
 			expected: []*sinkpb.SinkResponse{
 				{
-					Result: &sinkpb.SinkResponse_Result{},
 					Handshake: &sinkpb.Handshake{
 						Sot: true,
 					},
 				},
 				{
-					Result: &sinkpb.SinkResponse_Result{
-						Status: sinkpb.Status_SUCCESS,
-						Id:     "one-processed",
-						ErrMsg: "",
-					},
-				},
-				{
-					Result: &sinkpb.SinkResponse_Result{
-						Status: sinkpb.Status_SUCCESS,
-						Id:     "two-processed",
-						ErrMsg: "",
-					},
-				},
-				{
-					Result: &sinkpb.SinkResponse_Result{
-						Status: sinkpb.Status_SUCCESS,
-						Id:     "three-processed",
-						ErrMsg: "",
+					Results: []*sinkpb.SinkResponse_Result{
+						{
+							Status: sinkpb.Status_SUCCESS,
+							Id:     "one-processed",
+							ErrMsg: "",
+						},
+						{
+							Status: sinkpb.Status_SUCCESS,
+							Id:     "two-processed",
+							ErrMsg: "",
+						},
+						{
+							Status: sinkpb.Status_SUCCESS,
+							Id:     "three-processed",
+							ErrMsg: "",
+						},
 					},
 				},
 				{
@@ -138,7 +133,6 @@ func TestService_SinkFn(t *testing.T) {
 			name: "sink_fn_test_failure",
 			input: []*sinkpb.SinkRequest{
 				{
-					Request: &sinkpb.SinkRequest_Request{},
 					Handshake: &sinkpb.Handshake{
 						Sot: true,
 					},
@@ -173,8 +167,7 @@ func TestService_SinkFn(t *testing.T) {
 					},
 				},
 				{
-					Request: &sinkpb.SinkRequest_Request{},
-					Status:  &sinkpb.TransmissionStatus{Eot: true},
+					Status: &sinkpb.TransmissionStatus{Eot: true},
 				},
 			},
 			sh: SinkerFunc(func(ctx context.Context, rch <-chan Datum) Responses {
@@ -187,30 +180,27 @@ func TestService_SinkFn(t *testing.T) {
 			}),
 			expected: []*sinkpb.SinkResponse{
 				{
-					Result: &sinkpb.SinkResponse_Result{},
 					Handshake: &sinkpb.Handshake{
 						Sot: true,
 					},
 				},
 				{
-					Result: &sinkpb.SinkResponse_Result{
-						Status: sinkpb.Status_FAILURE,
-						Id:     "one-processed",
-						ErrMsg: "unknown error",
-					},
-				},
-				{
-					Result: &sinkpb.SinkResponse_Result{
-						Status: sinkpb.Status_FAILURE,
-						Id:     "two-processed",
-						ErrMsg: "unknown error",
-					},
-				},
-				{
-					Result: &sinkpb.SinkResponse_Result{
-						Status: sinkpb.Status_FAILURE,
-						Id:     "three-processed",
-						ErrMsg: "unknown error",
+					Results: []*sinkpb.SinkResponse_Result{
+						{
+							Status: sinkpb.Status_FAILURE,
+							Id:     "one-processed",
+							ErrMsg: "unknown error",
+						},
+						{
+							Status: sinkpb.Status_FAILURE,
+							Id:     "two-processed",
+							ErrMsg: "unknown error",
+						},
+						{
+							Status: sinkpb.Status_FAILURE,
+							Id:     "three-processed",
+							ErrMsg: "unknown error",
+						},
 					},
 				},
 				{
@@ -246,8 +236,8 @@ func TestService_SinkFn(t *testing.T) {
 
 			wg.Wait()
 
-			if !reflect.DeepEqual(udfReduceFnStream.rl, tt.expected) {
-				t.Errorf("ReduceFn() got = %v, want %v", udfReduceFnStream.rl, tt.expected)
+			for i, val := range tt.expected {
+				assert.Equal(t, val, udfReduceFnStream.rl[i])
 			}
 		})
 	}
diff --git a/pkg/sourcer/examples/simple_source/impl/simple_source.go b/pkg/sourcer/examples/simple_source/impl/simple_source.go
index 87ec9dcb..33423ccf 100644
--- a/pkg/sourcer/examples/simple_source/impl/simple_source.go
+++ b/pkg/sourcer/examples/simple_source/impl/simple_source.go
@@ -76,8 +76,9 @@ func (s *SimpleSource) Read(_ context.Context, readRequest sourcesdk.ReadRequest
 func (s *SimpleSource) Ack(_ context.Context, request sourcesdk.AckRequest) {
 	s.lock.Lock()
 	defer s.lock.Unlock()
-	offset := deserializeOffset(request.Offset().Value())
-	delete(s.toAckSet, offset)
+	for _, offset := range request.Offsets() {
+		delete(s.toAckSet, deserializeOffset(offset.Value()))
+	}
 }
 
 func (s *SimpleSource) Partitions(_ context.Context) []int32 {
diff --git a/pkg/sourcer/interface.go b/pkg/sourcer/interface.go
index 16a4cc54..3c7845a3 100644
--- a/pkg/sourcer/interface.go
+++ b/pkg/sourcer/interface.go
@@ -36,6 +36,6 @@ type ReadRequest interface {
 
 // AckRequest is the interface of ack request.
 type AckRequest interface {
-	// Offset returns the offset of the record to ack.
-	Offset() Offset
+	// Offsets returns the offsets to be acknowledged.
+	Offsets() []Offset
 }
diff --git a/pkg/sourcer/service.go b/pkg/sourcer/service.go
index 90cb63d2..1e0fa61c 100644
--- a/pkg/sourcer/service.go
+++ b/pkg/sourcer/service.go
@@ -149,12 +149,12 @@ func (fs *Service) processReadData(stream sourcepb.Source_ReadFnServer, messageC
 
 // ackRequest implements the AckRequest interface and is used in the ack handler.
 type ackRequest struct {
-	offset Offset
+	offsets []Offset
 }
 
-// Offset returns the offset of the record to ack.
-func (a *ackRequest) Offset() Offset {
-	return a.offset
+// Offsets returns the offsets to be acknowledged.
+func (a *ackRequest) Offsets() []Offset {
+	return a.offsets
 }
 
 // AckFn acknowledges the data from the source.
@@ -223,8 +223,13 @@ func (fs *Service) receiveAckRequests(ctx context.Context, stream sourcepb.Sourc
 		return err
 	}
 
+	offsets := make([]Offset, len(req.Request.GetOffsets()))
+	for i, offset := range req.Request.GetOffsets() {
+		offsets[i] = NewOffset(offset.GetOffset(), offset.GetPartitionId())
+	}
+
 	request := ackRequest{
-		offset: NewOffset(req.Request.Offset.GetOffset(), req.Request.Offset.GetPartitionId()),
+		offsets: offsets,
 	}
 	fs.Source.Ack(ctx, &request)
 
diff --git a/pkg/sourcer/service_test.go b/pkg/sourcer/service_test.go
index 8f641a84..bf3ea4bc 100644
--- a/pkg/sourcer/service_test.go
+++ b/pkg/sourcer/service_test.go
@@ -141,7 +141,7 @@ func (a *AckFnServerTest) Recv() (*sourcepb.AckRequest, error) {
 	a.index++
 	return &sourcepb.AckRequest{
 		Request: &sourcepb.AckRequest_Request{
-			Offset: offset,
+			Offsets: []*sourcepb.Offset{offset},
 		},
 	}, nil
 }