diff --git a/go.mod b/go.mod
index e5cf9d54..77f26309 100644
--- a/go.mod
+++ b/go.mod
@@ -2,8 +2,6 @@ module github.com/numaproj/numaflow-go
 
 go 1.21
 
-toolchain go1.22.4
-
 require (
 	github.com/golang/mock v1.6.0
 	github.com/stretchr/testify v1.8.1
diff --git a/pkg/apis/proto/source/v1/source.pb.go b/pkg/apis/proto/source/v1/source.pb.go
index 9fd77179..dba248ac 100644
--- a/pkg/apis/proto/source/v1/source.pb.go
+++ b/pkg/apis/proto/source/v1/source.pb.go
@@ -22,6 +22,100 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+// Code to indicate the status of the response.
+type ReadResponse_Status_Code int32
+
+const (
+	ReadResponse_Status_SUCCESS ReadResponse_Status_Code = 0
+	ReadResponse_Status_FAILURE ReadResponse_Status_Code = 1
+)
+
+// Enum value maps for ReadResponse_Status_Code.
+var (
+	ReadResponse_Status_Code_name = map[int32]string{
+		0: "SUCCESS",
+		1: "FAILURE",
+	}
+	ReadResponse_Status_Code_value = map[string]int32{
+		"SUCCESS": 0,
+		"FAILURE": 1,
+	}
+)
+
+func (x ReadResponse_Status_Code) Enum() *ReadResponse_Status_Code {
+	p := new(ReadResponse_Status_Code)
+	*p = x
+	return p
+}
+
+func (x ReadResponse_Status_Code) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (ReadResponse_Status_Code) Descriptor() protoreflect.EnumDescriptor {
+	return file_pkg_apis_proto_source_v1_source_proto_enumTypes[0].Descriptor()
+}
+
+func (ReadResponse_Status_Code) Type() protoreflect.EnumType {
+	return &file_pkg_apis_proto_source_v1_source_proto_enumTypes[0]
+}
+
+func (x ReadResponse_Status_Code) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use ReadResponse_Status_Code.Descriptor instead.
+func (ReadResponse_Status_Code) EnumDescriptor() ([]byte, []int) {
+	return file_pkg_apis_proto_source_v1_source_proto_rawDescGZIP(), []int{1, 1, 0}
+}
+
+// Error to indicate the error type. If the code is FAILURE, then the error field will be populated.
+type ReadResponse_Status_Error int32
+
+const (
+	ReadResponse_Status_UNACKED ReadResponse_Status_Error = 0
+	ReadResponse_Status_OTHER   ReadResponse_Status_Error = 1
+)
+
+// Enum value maps for ReadResponse_Status_Error.
+var (
+	ReadResponse_Status_Error_name = map[int32]string{
+		0: "UNACKED",
+		1: "OTHER",
+	}
+	ReadResponse_Status_Error_value = map[string]int32{
+		"UNACKED": 0,
+		"OTHER":   1,
+	}
+)
+
+func (x ReadResponse_Status_Error) Enum() *ReadResponse_Status_Error {
+	p := new(ReadResponse_Status_Error)
+	*p = x
+	return p
+}
+
+func (x ReadResponse_Status_Error) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (ReadResponse_Status_Error) Descriptor() protoreflect.EnumDescriptor {
+	return file_pkg_apis_proto_source_v1_source_proto_enumTypes[1].Descriptor()
+}
+
+func (ReadResponse_Status_Error) Type() protoreflect.EnumType {
+	return &file_pkg_apis_proto_source_v1_source_proto_enumTypes[1]
+}
+
+func (x ReadResponse_Status_Error) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use ReadResponse_Status_Error.Descriptor instead.
+func (ReadResponse_Status_Error) EnumDescriptor() ([]byte, []int) {
+	return file_pkg_apis_proto_source_v1_source_proto_rawDescGZIP(), []int{1, 1, 1}
+}
+
 // ReadRequest is the request for reading datum stream from user defined source.
 type ReadRequest struct {
 	state         protoimpl.MessageState
@@ -79,6 +173,8 @@ type ReadResponse struct {
 
 	// Required field holding the result.
 	Result *ReadResponse_Result `protobuf:"bytes,1,opt,name=result,proto3" json:"result,omitempty"`
+	// Status of the response. Holds the end of transmission flag and the status code.
+	Status *ReadResponse_Status `protobuf:"bytes,2,opt,name=status,proto3" json:"status,omitempty"`
 }
 
 func (x *ReadResponse) Reset() {
@@ -120,6 +216,13 @@ func (x *ReadResponse) GetResult() *ReadResponse_Result {
 	return nil
 }
 
+func (x *ReadResponse) GetStatus() *ReadResponse_Status {
+	if x != nil {
+		return x.Status
+	}
+	return nil
+}
+
 // AckRequest is the request for acknowledging datum.
 // It takes a list of offsets to be acknowledged.
 type AckRequest struct {
@@ -584,6 +687,78 @@ func (x *ReadResponse_Result) GetHeaders() map[string]string {
 	return nil
 }
 
+type ReadResponse_Status struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// End of transmission flag.
+	Eot   bool                      `protobuf:"varint,1,opt,name=eot,proto3" json:"eot,omitempty"`
+	Code  ReadResponse_Status_Code  `protobuf:"varint,2,opt,name=code,proto3,enum=source.v1.ReadResponse_Status_Code" json:"code,omitempty"`
+	Error ReadResponse_Status_Error `protobuf:"varint,3,opt,name=error,proto3,enum=source.v1.ReadResponse_Status_Error" json:"error,omitempty"`
+	Msg   *string                   `protobuf:"bytes,4,opt,name=msg,proto3,oneof" json:"msg,omitempty"`
+}
+
+func (x *ReadResponse_Status) Reset() {
+	*x = ReadResponse_Status{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[10]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ReadResponse_Status) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ReadResponse_Status) ProtoMessage() {}
+
+func (x *ReadResponse_Status) ProtoReflect() protoreflect.Message {
+	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[10]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ReadResponse_Status.ProtoReflect.Descriptor instead.
+func (*ReadResponse_Status) Descriptor() ([]byte, []int) {
+	return file_pkg_apis_proto_source_v1_source_proto_rawDescGZIP(), []int{1, 1}
+}
+
+func (x *ReadResponse_Status) GetEot() bool {
+	if x != nil {
+		return x.Eot
+	}
+	return false
+}
+
+func (x *ReadResponse_Status) GetCode() ReadResponse_Status_Code {
+	if x != nil {
+		return x.Code
+	}
+	return ReadResponse_Status_SUCCESS
+}
+
+func (x *ReadResponse_Status) GetError() ReadResponse_Status_Error {
+	if x != nil {
+		return x.Error
+	}
+	return ReadResponse_Status_UNACKED
+}
+
+func (x *ReadResponse_Status) GetMsg() string {
+	if x != nil && x.Msg != nil {
+		return *x.Msg
+	}
+	return ""
+}
+
 type AckRequest_Request struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -596,7 +771,7 @@ type AckRequest_Request struct {
 func (x *AckRequest_Request) Reset() {
 	*x = AckRequest_Request{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[11]
+		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -609,7 +784,7 @@ func (x *AckRequest_Request) String() string {
 func (*AckRequest_Request) ProtoMessage() {}
 
 func (x *AckRequest_Request) ProtoReflect() protoreflect.Message {
-	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[11]
+	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -644,7 +819,7 @@ type AckResponse_Result struct {
 func (x *AckResponse_Result) Reset() {
 	*x = AckResponse_Result{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[12]
+		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -657,7 +832,7 @@ func (x *AckResponse_Result) String() string {
 func (*AckResponse_Result) ProtoMessage() {}
 
 func (x *AckResponse_Result) ProtoReflect() protoreflect.Message {
-	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[12]
+	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -693,7 +868,7 @@ type PendingResponse_Result struct {
 func (x *PendingResponse_Result) Reset() {
 	*x = PendingResponse_Result{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[13]
+		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -706,7 +881,7 @@ func (x *PendingResponse_Result) String() string {
 func (*PendingResponse_Result) ProtoMessage() {}
 
 func (x *PendingResponse_Result) ProtoReflect() protoreflect.Message {
-	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[13]
+	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -741,7 +916,7 @@ type PartitionsResponse_Result struct {
 func (x *PartitionsResponse_Result) Reset() {
 	*x = PartitionsResponse_Result{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[14]
+		mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -754,7 +929,7 @@ func (x *PartitionsResponse_Result) String() string {
 func (*PartitionsResponse_Result) ProtoMessage() {}
 
 func (x *PartitionsResponse_Result) ProtoReflect() protoreflect.Message {
-	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[14]
+	mi := &file_pkg_apis_proto_source_v1_source_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -796,92 +971,111 @@ var file_pkg_apis_proto_source_v1_source_proto_rawDesc = []byte{
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-	0x73, 0x52, 0x65, 0x73, 0x70, 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,
+	0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x1a, 0x1d, 0x2e, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x2e,
+	0x76, 0x31, 0x2e, 0x50, 0x61, 0x72, 0x74, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x52, 0x65, 0x73,
+	0x70, 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 (
@@ -896,53 +1090,60 @@ func file_pkg_apis_proto_source_v1_source_proto_rawDescGZIP() []byte {
 	return file_pkg_apis_proto_source_v1_source_proto_rawDescData
 }
 
-var file_pkg_apis_proto_source_v1_source_proto_msgTypes = make([]protoimpl.MessageInfo, 15)
+var file_pkg_apis_proto_source_v1_source_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_pkg_apis_proto_source_v1_source_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
 var file_pkg_apis_proto_source_v1_source_proto_goTypes = []any{
-	(*ReadRequest)(nil),               // 0: source.v1.ReadRequest
-	(*ReadResponse)(nil),              // 1: source.v1.ReadResponse
-	(*AckRequest)(nil),                // 2: source.v1.AckRequest
-	(*AckResponse)(nil),               // 3: source.v1.AckResponse
-	(*ReadyResponse)(nil),             // 4: source.v1.ReadyResponse
-	(*PendingResponse)(nil),           // 5: source.v1.PendingResponse
-	(*PartitionsResponse)(nil),        // 6: source.v1.PartitionsResponse
-	(*Offset)(nil),                    // 7: source.v1.Offset
-	(*ReadRequest_Request)(nil),       // 8: source.v1.ReadRequest.Request
-	(*ReadResponse_Result)(nil),       // 9: source.v1.ReadResponse.Result
-	nil,                               // 10: source.v1.ReadResponse.Result.HeadersEntry
-	(*AckRequest_Request)(nil),        // 11: source.v1.AckRequest.Request
-	(*AckResponse_Result)(nil),        // 12: source.v1.AckResponse.Result
-	(*PendingResponse_Result)(nil),    // 13: source.v1.PendingResponse.Result
-	(*PartitionsResponse_Result)(nil), // 14: source.v1.PartitionsResponse.Result
-	(*timestamppb.Timestamp)(nil),     // 15: google.protobuf.Timestamp
-	(*emptypb.Empty)(nil),             // 16: google.protobuf.Empty
+	(ReadResponse_Status_Code)(0),     // 0: source.v1.ReadResponse.Status.Code
+	(ReadResponse_Status_Error)(0),    // 1: source.v1.ReadResponse.Status.Error
+	(*ReadRequest)(nil),               // 2: source.v1.ReadRequest
+	(*ReadResponse)(nil),              // 3: source.v1.ReadResponse
+	(*AckRequest)(nil),                // 4: source.v1.AckRequest
+	(*AckResponse)(nil),               // 5: source.v1.AckResponse
+	(*ReadyResponse)(nil),             // 6: source.v1.ReadyResponse
+	(*PendingResponse)(nil),           // 7: source.v1.PendingResponse
+	(*PartitionsResponse)(nil),        // 8: source.v1.PartitionsResponse
+	(*Offset)(nil),                    // 9: source.v1.Offset
+	(*ReadRequest_Request)(nil),       // 10: source.v1.ReadRequest.Request
+	(*ReadResponse_Result)(nil),       // 11: source.v1.ReadResponse.Result
+	(*ReadResponse_Status)(nil),       // 12: source.v1.ReadResponse.Status
+	nil,                               // 13: source.v1.ReadResponse.Result.HeadersEntry
+	(*AckRequest_Request)(nil),        // 14: source.v1.AckRequest.Request
+	(*AckResponse_Result)(nil),        // 15: source.v1.AckResponse.Result
+	(*PendingResponse_Result)(nil),    // 16: source.v1.PendingResponse.Result
+	(*PartitionsResponse_Result)(nil), // 17: source.v1.PartitionsResponse.Result
+	(*timestamppb.Timestamp)(nil),     // 18: google.protobuf.Timestamp
+	(*emptypb.Empty)(nil),             // 19: google.protobuf.Empty
 }
 var file_pkg_apis_proto_source_v1_source_proto_depIdxs = []int32{
-	8,  // 0: source.v1.ReadRequest.request:type_name -> source.v1.ReadRequest.Request
-	9,  // 1: source.v1.ReadResponse.result:type_name -> source.v1.ReadResponse.Result
-	11, // 2: source.v1.AckRequest.request:type_name -> source.v1.AckRequest.Request
-	12, // 3: source.v1.AckResponse.result:type_name -> source.v1.AckResponse.Result
-	13, // 4: source.v1.PendingResponse.result:type_name -> source.v1.PendingResponse.Result
-	14, // 5: source.v1.PartitionsResponse.result:type_name -> source.v1.PartitionsResponse.Result
-	7,  // 6: source.v1.ReadResponse.Result.offset:type_name -> source.v1.Offset
-	15, // 7: source.v1.ReadResponse.Result.event_time:type_name -> google.protobuf.Timestamp
-	10, // 8: source.v1.ReadResponse.Result.headers:type_name -> source.v1.ReadResponse.Result.HeadersEntry
-	7,  // 9: source.v1.AckRequest.Request.offset:type_name -> source.v1.Offset
-	16, // 10: source.v1.AckResponse.Result.success:type_name -> google.protobuf.Empty
-	0,  // 11: source.v1.Source.ReadFn:input_type -> source.v1.ReadRequest
-	2,  // 12: source.v1.Source.AckFn:input_type -> source.v1.AckRequest
-	16, // 13: source.v1.Source.PendingFn:input_type -> google.protobuf.Empty
-	16, // 14: source.v1.Source.PartitionsFn:input_type -> google.protobuf.Empty
-	16, // 15: source.v1.Source.IsReady:input_type -> google.protobuf.Empty
-	1,  // 16: source.v1.Source.ReadFn:output_type -> source.v1.ReadResponse
-	3,  // 17: source.v1.Source.AckFn:output_type -> source.v1.AckResponse
-	5,  // 18: source.v1.Source.PendingFn:output_type -> source.v1.PendingResponse
-	6,  // 19: source.v1.Source.PartitionsFn:output_type -> source.v1.PartitionsResponse
-	4,  // 20: source.v1.Source.IsReady:output_type -> source.v1.ReadyResponse
-	16, // [16:21] is the sub-list for method output_type
-	11, // [11:16] is the sub-list for method input_type
-	11, // [11:11] is the sub-list for extension type_name
-	11, // [11:11] is the sub-list for extension extendee
-	0,  // [0:11] is the sub-list for field type_name
+	10, // 0: source.v1.ReadRequest.request:type_name -> source.v1.ReadRequest.Request
+	11, // 1: source.v1.ReadResponse.result:type_name -> source.v1.ReadResponse.Result
+	12, // 2: source.v1.ReadResponse.status:type_name -> source.v1.ReadResponse.Status
+	14, // 3: source.v1.AckRequest.request:type_name -> source.v1.AckRequest.Request
+	15, // 4: source.v1.AckResponse.result:type_name -> source.v1.AckResponse.Result
+	16, // 5: source.v1.PendingResponse.result:type_name -> source.v1.PendingResponse.Result
+	17, // 6: source.v1.PartitionsResponse.result:type_name -> source.v1.PartitionsResponse.Result
+	9,  // 7: source.v1.ReadResponse.Result.offset:type_name -> source.v1.Offset
+	18, // 8: source.v1.ReadResponse.Result.event_time:type_name -> google.protobuf.Timestamp
+	13, // 9: source.v1.ReadResponse.Result.headers:type_name -> source.v1.ReadResponse.Result.HeadersEntry
+	0,  // 10: source.v1.ReadResponse.Status.code:type_name -> source.v1.ReadResponse.Status.Code
+	1,  // 11: source.v1.ReadResponse.Status.error:type_name -> source.v1.ReadResponse.Status.Error
+	9,  // 12: source.v1.AckRequest.Request.offset:type_name -> source.v1.Offset
+	19, // 13: source.v1.AckResponse.Result.success:type_name -> google.protobuf.Empty
+	2,  // 14: source.v1.Source.ReadFn:input_type -> source.v1.ReadRequest
+	4,  // 15: source.v1.Source.AckFn:input_type -> source.v1.AckRequest
+	19, // 16: source.v1.Source.PendingFn:input_type -> google.protobuf.Empty
+	19, // 17: source.v1.Source.PartitionsFn:input_type -> google.protobuf.Empty
+	19, // 18: source.v1.Source.IsReady:input_type -> google.protobuf.Empty
+	3,  // 19: source.v1.Source.ReadFn:output_type -> source.v1.ReadResponse
+	5,  // 20: source.v1.Source.AckFn:output_type -> source.v1.AckResponse
+	7,  // 21: source.v1.Source.PendingFn:output_type -> source.v1.PendingResponse
+	8,  // 22: source.v1.Source.PartitionsFn:output_type -> source.v1.PartitionsResponse
+	6,  // 23: source.v1.Source.IsReady:output_type -> source.v1.ReadyResponse
+	19, // [19:24] is the sub-list for method output_type
+	14, // [14:19] is the sub-list for method input_type
+	14, // [14:14] is the sub-list for extension type_name
+	14, // [14:14] is the sub-list for extension extendee
+	0,  // [0:14] is the sub-list for field type_name
 }
 
 func init() { file_pkg_apis_proto_source_v1_source_proto_init() }
@@ -1071,8 +1272,8 @@ func file_pkg_apis_proto_source_v1_source_proto_init() {
 				return nil
 			}
 		}
-		file_pkg_apis_proto_source_v1_source_proto_msgTypes[11].Exporter = func(v any, i int) any {
-			switch v := v.(*AckRequest_Request); i {
+		file_pkg_apis_proto_source_v1_source_proto_msgTypes[10].Exporter = func(v any, i int) any {
+			switch v := v.(*ReadResponse_Status); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1084,7 +1285,7 @@ func file_pkg_apis_proto_source_v1_source_proto_init() {
 			}
 		}
 		file_pkg_apis_proto_source_v1_source_proto_msgTypes[12].Exporter = func(v any, i int) any {
-			switch v := v.(*AckResponse_Result); i {
+			switch v := v.(*AckRequest_Request); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1096,7 +1297,7 @@ func file_pkg_apis_proto_source_v1_source_proto_init() {
 			}
 		}
 		file_pkg_apis_proto_source_v1_source_proto_msgTypes[13].Exporter = func(v any, i int) any {
-			switch v := v.(*PendingResponse_Result); i {
+			switch v := v.(*AckResponse_Result); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1108,6 +1309,18 @@ func file_pkg_apis_proto_source_v1_source_proto_init() {
 			}
 		}
 		file_pkg_apis_proto_source_v1_source_proto_msgTypes[14].Exporter = func(v any, i int) any {
+			switch v := v.(*PendingResponse_Result); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_pkg_apis_proto_source_v1_source_proto_msgTypes[15].Exporter = func(v any, i int) any {
 			switch v := v.(*PartitionsResponse_Result); i {
 			case 0:
 				return &v.state
@@ -1120,18 +1333,20 @@ func file_pkg_apis_proto_source_v1_source_proto_init() {
 			}
 		}
 	}
+	file_pkg_apis_proto_source_v1_source_proto_msgTypes[10].OneofWrappers = []any{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_pkg_apis_proto_source_v1_source_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   15,
+			NumEnums:      2,
+			NumMessages:   16,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
 		GoTypes:           file_pkg_apis_proto_source_v1_source_proto_goTypes,
 		DependencyIndexes: file_pkg_apis_proto_source_v1_source_proto_depIdxs,
+		EnumInfos:         file_pkg_apis_proto_source_v1_source_proto_enumTypes,
 		MessageInfos:      file_pkg_apis_proto_source_v1_source_proto_msgTypes,
 	}.Build()
 	File_pkg_apis_proto_source_v1_source_proto = out.File
diff --git a/pkg/apis/proto/source/v1/source.proto b/pkg/apis/proto/source/v1/source.proto
index 1f251b3c..314f2905 100644
--- a/pkg/apis/proto/source/v1/source.proto
+++ b/pkg/apis/proto/source/v1/source.proto
@@ -68,8 +68,30 @@ message ReadResponse {
     // e.g. Kafka and Redis Stream message usually include information about the headers.
     map<string, string> headers = 5;
   }
+  message Status {
+    // Code to indicate the status of the response.
+    enum Code {
+      SUCCESS = 0;
+      FAILURE = 1;
+    }
+
+    // Error to indicate the error type. If the code is FAILURE, then the error field will be populated.
+    enum Error {
+      UNACKED = 0;
+      OTHER = 1;
+    }
+
+    // End of transmission flag.
+    bool eot = 1;
+    Code code = 2;
+    Error error = 3;
+    optional string msg = 4;
+  }
   // Required field holding the result.
   Result result = 1;
+  // Status of the response. Holds the end of transmission flag and the status code.
+  //
+  Status status = 2;
 }
 
 /*
diff --git a/pkg/batchmapper/examples/batchmap_flatmap/go.mod b/pkg/batchmapper/examples/batchmap_flatmap/go.mod
index 2a4f2180..955ee4ec 100644
--- a/pkg/batchmapper/examples/batchmap_flatmap/go.mod
+++ b/pkg/batchmapper/examples/batchmap_flatmap/go.mod
@@ -2,8 +2,6 @@ module batchmap-flatmap
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/mapper/examples/even_odd/go.mod b/pkg/mapper/examples/even_odd/go.mod
index 043ac8f4..9ae5e962 100644
--- a/pkg/mapper/examples/even_odd/go.mod
+++ b/pkg/mapper/examples/even_odd/go.mod
@@ -2,8 +2,6 @@ module even_odd
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/mapper/examples/flatmap/go.mod b/pkg/mapper/examples/flatmap/go.mod
index 4a0f8b38..e0d09895 100644
--- a/pkg/mapper/examples/flatmap/go.mod
+++ b/pkg/mapper/examples/flatmap/go.mod
@@ -2,8 +2,6 @@ module flatmap
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/mapper/examples/forward_message/go.mod b/pkg/mapper/examples/forward_message/go.mod
index ec58f147..105bb757 100644
--- a/pkg/mapper/examples/forward_message/go.mod
+++ b/pkg/mapper/examples/forward_message/go.mod
@@ -2,8 +2,6 @@ module forward_message
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/mapper/examples/retry/go.mod b/pkg/mapper/examples/retry/go.mod
index 539300e3..7b99a191 100644
--- a/pkg/mapper/examples/retry/go.mod
+++ b/pkg/mapper/examples/retry/go.mod
@@ -2,8 +2,6 @@ module retry
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/mapper/examples/tickgen/go.mod b/pkg/mapper/examples/tickgen/go.mod
index 15fc53cc..ae01041e 100644
--- a/pkg/mapper/examples/tickgen/go.mod
+++ b/pkg/mapper/examples/tickgen/go.mod
@@ -2,8 +2,6 @@ module tickgen
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/mapstreamer/examples/flatmap_stream/go.mod b/pkg/mapstreamer/examples/flatmap_stream/go.mod
index 85fa7d0d..7ecda24b 100644
--- a/pkg/mapstreamer/examples/flatmap_stream/go.mod
+++ b/pkg/mapstreamer/examples/flatmap_stream/go.mod
@@ -2,8 +2,6 @@ module flatmap_stream
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/reducer/examples/counter/go.mod b/pkg/reducer/examples/counter/go.mod
index f1bd9353..f0feabbe 100644
--- a/pkg/reducer/examples/counter/go.mod
+++ b/pkg/reducer/examples/counter/go.mod
@@ -2,8 +2,6 @@ module counter
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/reducer/examples/sum/go.mod b/pkg/reducer/examples/sum/go.mod
index 5a04da23..5425ca28 100644
--- a/pkg/reducer/examples/sum/go.mod
+++ b/pkg/reducer/examples/sum/go.mod
@@ -2,8 +2,6 @@ module sum
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/reducestreamer/examples/counter/go.mod b/pkg/reducestreamer/examples/counter/go.mod
index f1bd9353..f0feabbe 100644
--- a/pkg/reducestreamer/examples/counter/go.mod
+++ b/pkg/reducestreamer/examples/counter/go.mod
@@ -2,8 +2,6 @@ module counter
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/reducestreamer/examples/sum/go.mod b/pkg/reducestreamer/examples/sum/go.mod
index 5a04da23..5425ca28 100644
--- a/pkg/reducestreamer/examples/sum/go.mod
+++ b/pkg/reducestreamer/examples/sum/go.mod
@@ -2,8 +2,6 @@ module sum
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/sessionreducer/examples/counter/go.mod b/pkg/sessionreducer/examples/counter/go.mod
index a255e821..17aa3337 100644
--- a/pkg/sessionreducer/examples/counter/go.mod
+++ b/pkg/sessionreducer/examples/counter/go.mod
@@ -2,8 +2,6 @@ module counter
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require (
diff --git a/pkg/sessionreducer/examples/sum/go.mod b/pkg/sessionreducer/examples/sum/go.mod
index aff635c8..c02d9747 100644
--- a/pkg/sessionreducer/examples/sum/go.mod
+++ b/pkg/sessionreducer/examples/sum/go.mod
@@ -2,8 +2,6 @@ module sum
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require (
diff --git a/pkg/sideinput/examples/simple_sideinput/go.mod b/pkg/sideinput/examples/simple_sideinput/go.mod
index 4cb237ce..bf7eabef 100644
--- a/pkg/sideinput/examples/simple_sideinput/go.mod
+++ b/pkg/sideinput/examples/simple_sideinput/go.mod
@@ -2,8 +2,6 @@ module simple_sideinput
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/sideinput/examples/simple_sideinput/udf/go.mod b/pkg/sideinput/examples/simple_sideinput/udf/go.mod
index e94f8c53..f9d7bd73 100644
--- a/pkg/sideinput/examples/simple_sideinput/udf/go.mod
+++ b/pkg/sideinput/examples/simple_sideinput/udf/go.mod
@@ -2,8 +2,6 @@ module udf
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../../..
 
 require (
diff --git a/pkg/sinker/examples/fallback/go.mod b/pkg/sinker/examples/fallback/go.mod
index 58181144..2c901d73 100644
--- a/pkg/sinker/examples/fallback/go.mod
+++ b/pkg/sinker/examples/fallback/go.mod
@@ -2,8 +2,6 @@ module fallback
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/sinker/examples/log/go.mod b/pkg/sinker/examples/log/go.mod
index 2699aa86..63639be0 100644
--- a/pkg/sinker/examples/log/go.mod
+++ b/pkg/sinker/examples/log/go.mod
@@ -2,8 +2,6 @@ module log_sink
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/sinker/examples/redis_sink/go.mod b/pkg/sinker/examples/redis_sink/go.mod
index 1cad373c..9427cbca 100644
--- a/pkg/sinker/examples/redis_sink/go.mod
+++ b/pkg/sinker/examples/redis_sink/go.mod
@@ -2,8 +2,6 @@ module redis-e2e-test-sink
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require (
diff --git a/pkg/sourcer/examples/simple_source/go.mod b/pkg/sourcer/examples/simple_source/go.mod
index 841ad3a7..02e15749 100644
--- a/pkg/sourcer/examples/simple_source/go.mod
+++ b/pkg/sourcer/examples/simple_source/go.mod
@@ -2,8 +2,6 @@ module simple_source
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require (
@@ -14,11 +12,10 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.12.0 // indirect
-	golang.org/x/net v0.28.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
 	golang.org/x/sys v0.25.0 // indirect
 	golang.org/x/text v0.18.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 // indirect
diff --git a/pkg/sourcer/examples/simple_source/go.sum b/pkg/sourcer/examples/simple_source/go.sum
index cfffb6f2..4646dbfd 100644
--- a/pkg/sourcer/examples/simple_source/go.sum
+++ b/pkg/sourcer/examples/simple_source/go.sum
@@ -2,15 +2,12 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
-github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
-github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
-github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -24,29 +21,23 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-golang.org/x/net v0.9.0 h1:aWJ/m6xSmxWBx+V0XRHTlrYrPG56jKsLdTFmsSsCzOM=
-golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
+golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
 golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
-golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
-golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/net v0.29.0 h1:5ORfpBpCs4HzDYoodCDBbwHzdR5UrLBZ3sOnUJmFoHo=
+golang.org/x/net v0.29.0/go.mod h1:gLkgy8jTGERgjzMic6DS9+SP0ajcu6Xu3Orq/SpETg0=
+golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
 golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
-golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
 golang.org/x/text v0.18.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230525234030-28d5490b6b19 h1:0nDDozoAU19Qb2HwhXadU8OcsiO/09cnTqhUtq2MEOM=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230525234030-28d5490b6b19/go.mod h1:66JfowdXAEgad5O9NnYcsNPLCPZJD++2L9X0PCMODrA=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 h1:pPJltXNxVzT4pK9yD8vR9X75DaWYYmLGMsEvBfFQZzQ=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
-google.golang.org/grpc v1.57.0 h1:kfzNeI/klCGD2YPMUlaGNT3pxvYfga7smW3Vth8Zsiw=
-google.golang.org/grpc v1.57.0/go.mod h1:Sd+9RMTACXwmub0zcNY2c4arhtrbBYD1AUHI/dt16Mo=
+google.golang.org/grpc v1.66.0 h1:DibZuoBznOxbDQxRINckZcUvnCEvrW9pcWIE2yF9r1c=
 google.golang.org/grpc v1.66.0/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
 google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/pkg/sourcer/examples/simple_source/impl/simple_source.go b/pkg/sourcer/examples/simple_source/impl/simple_source.go
index 4ec7d9cc..9409fe25 100644
--- a/pkg/sourcer/examples/simple_source/impl/simple_source.go
+++ b/pkg/sourcer/examples/simple_source/impl/simple_source.go
@@ -2,6 +2,7 @@ package impl
 
 import (
 	"context"
+	"log"
 	"strconv"
 	"sync"
 	"time"
@@ -27,8 +28,11 @@ func NewSimpleSource() *SimpleSource {
 }
 
 func (s *SimpleSource) Pending(_ context.Context) int64 {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	log.Println("Number of pending records: ", len(s.toAckSet))
 	// The simple source always returns zero to indicate there is no pending record.
-	return 0
+	return int64(len(s.toAckSet))
 }
 
 func (s *SimpleSource) Read(_ context.Context, readRequest sourcesdk.ReadRequest, messageCh chan<- sourcesdk.Message) {
@@ -42,9 +46,9 @@ func (s *SimpleSource) Read(_ context.Context, readRequest sourcesdk.ReadRequest
 	// leaving the toAckSet not empty on the UDSource container side.
 	// In this case, for the next batch read, we should read the data from the last acked offset instead of returning.
 	// Our built-in Kafka source follows this logic.
-	if len(s.toAckSet) > 0 {
-		return
-	}
+	//if len(s.toAckSet) > 0 {
+	//	return
+	//}
 
 	// Read the data from the source and send the data to the message channel.
 	for i := 0; uint64(i) < readRequest.Count(); i++ {
@@ -72,7 +76,10 @@ func (s *SimpleSource) Read(_ context.Context, readRequest sourcesdk.ReadRequest
 }
 
 func (s *SimpleSource) Ack(_ context.Context, request sourcesdk.AckRequest) {
-	delete(s.toAckSet, deserializeOffset(request.Offset().Value()))
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	offset := deserializeOffset(request.Offset().Value())
+	delete(s.toAckSet, offset)
 }
 
 func (s *SimpleSource) Partitions(_ context.Context) []int32 {
diff --git a/pkg/sourcer/service.go b/pkg/sourcer/service.go
index eff56796..2d58de8c 100644
--- a/pkg/sourcer/service.go
+++ b/pkg/sourcer/service.go
@@ -32,7 +32,6 @@ type Service struct {
 // ReadFn reads the data from the source.
 func (fs *Service) ReadFn(stream sourcepb.Source_ReadFnServer) error {
 	ctx := stream.Context()
-	messageCh := make(chan Message)
 	errCh := make(chan error, 1)
 
 	var wg sync.WaitGroup
@@ -40,7 +39,6 @@ func (fs *Service) ReadFn(stream sourcepb.Source_ReadFnServer) error {
 	wg.Add(1)
 	go func() {
 		defer wg.Done()
-		defer close(messageCh)
 		// handle panic
 		defer func() {
 			if r := recover(); r != nil {
@@ -62,35 +60,53 @@ func (fs *Service) ReadFn(stream sourcepb.Source_ReadFnServer) error {
 				return
 			}
 
-			request := readRequest{
-				count:   req.Request.GetNumRecords(),
-				timeout: time.Duration(req.Request.GetTimeoutInMs()) * time.Millisecond,
+			messageCh := make(chan Message)
+			go func() {
+				defer close(messageCh)
+				request := readRequest{
+					count:   req.Request.GetNumRecords(),
+					timeout: time.Duration(req.Request.GetTimeoutInMs()) * time.Millisecond,
+				}
+				fs.Source.Read(ctx, &request, messageCh)
+			}()
+
+			// Read messages from the channel and send them to the stream.
+			for msg := range messageCh {
+				offset := &sourcepb.Offset{
+					Offset:      msg.Offset().Value(),
+					PartitionId: msg.Offset().PartitionId(),
+				}
+				element := &sourcepb.ReadResponse{
+					Result: &sourcepb.ReadResponse_Result{
+						Payload:   msg.Value(),
+						Offset:    offset,
+						EventTime: timestamppb.New(msg.EventTime()),
+						Keys:      msg.Keys(),
+						Headers:   msg.Headers(),
+					},
+					Status: &sourcepb.ReadResponse_Status{
+						Eot:  false,
+						Code: 0,
+					},
+				}
+				// The error here is returned by the stream, which is already a gRPC error
+				if err := stream.Send(element); err != nil {
+					errCh <- err
+					return
+				}
+			}
+			err = stream.Send(&sourcepb.ReadResponse{
+				Status: &sourcepb.ReadResponse_Status{
+					Eot:  true,
+					Code: 0,
+				},
+			})
+			if err != nil {
+				errCh <- err
+				return
 			}
-
-			fs.Source.Read(ctx, &request, messageCh)
 		}
 	}()
-	// Read messages from the channel and send them to the stream, until the channel is closed
-	for msg := range messageCh {
-		offset := &sourcepb.Offset{
-			Offset:      msg.Offset().Value(),
-			PartitionId: msg.Offset().PartitionId(),
-		}
-		element := &sourcepb.ReadResponse{
-			Result: &sourcepb.ReadResponse_Result{
-				Payload:   msg.Value(),
-				Offset:    offset,
-				EventTime: timestamppb.New(msg.EventTime()),
-				Keys:      msg.Keys(),
-				Headers:   msg.Headers(),
-			},
-		}
-		// The error here is returned by the stream, which is already a gRPC error
-		if err := stream.Send(element); err != nil {
-			// The channel may or may not be closed, as we are not sure, we leave it to GC.
-			return err
-		}
-	}
 
 	// Wait for the goroutine to finish
 	wg.Wait()
diff --git a/pkg/sourcer/service_test.go b/pkg/sourcer/service_test.go
index 3418ecab..ae484fec 100644
--- a/pkg/sourcer/service_test.go
+++ b/pkg/sourcer/service_test.go
@@ -171,23 +171,23 @@ func TestService_ReadFn(t *testing.T) {
 						Keys:      []string{testKey},
 						Headers:   map[string]string{"x-txn-id": "test-txn-id"},
 					},
+					Status: &sourcepb.ReadResponse_Status{
+						Eot:  false,
+						Code: sourcepb.ReadResponse_Status_SUCCESS,
+					},
 				},
-			},
-			expectedErr: false,
-		},
-		{
-			name: "read_fn_err",
-			expected: []*sourcepb.ReadResponse{
 				{
-					Result: &sourcepb.ReadResponse_Result{
-						Payload:   []byte(`test`),
-						Offset:    &sourcepb.Offset{},
-						EventTime: timestamppb.New(testEventTime),
-						Keys:      []string{testKey},
-						Headers:   map[string]string{"x-txn-id": "test-txn-id"},
+					Status: &sourcepb.ReadResponse_Status{
+						Eot:  true,
+						Code: sourcepb.ReadResponse_Status_SUCCESS,
 					},
 				},
 			},
+			expectedErr: false,
+		},
+		{
+			name:        "read_fn_err",
+			expected:    []*sourcepb.ReadResponse{},
 			expectedErr: true,
 		},
 	}
diff --git a/pkg/sourcetransformer/examples/assign_event_time/go.mod b/pkg/sourcetransformer/examples/assign_event_time/go.mod
index ba9ba3bf..8e70063a 100644
--- a/pkg/sourcetransformer/examples/assign_event_time/go.mod
+++ b/pkg/sourcetransformer/examples/assign_event_time/go.mod
@@ -2,8 +2,6 @@ module assign_event_time
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require github.com/numaproj/numaflow-go v0.8.0
diff --git a/pkg/sourcetransformer/examples/event_time_filter/go.mod b/pkg/sourcetransformer/examples/event_time_filter/go.mod
index 7682680b..73900b91 100644
--- a/pkg/sourcetransformer/examples/event_time_filter/go.mod
+++ b/pkg/sourcetransformer/examples/event_time_filter/go.mod
@@ -2,8 +2,6 @@ module event_time_filter
 
 go 1.21
 
-toolchain go1.22.4
-
 replace github.com/numaproj/numaflow-go => ../../../..
 
 require (