diff --git a/internal/storage/binlog_iterator_test.go b/internal/storage/binlog_iterator_test.go
index fcb7cff0e1ee2..d387e0fedc2e7 100644
--- a/internal/storage/binlog_iterator_test.go
+++ b/internal/storage/binlog_iterator_test.go
@@ -171,7 +171,6 @@ func generateTestData(num int) ([]*Blob, error) {
 	}}
 
 	blobs, err := insertCodec.Serialize(1, 1, data)
-	fmt.Println(blobs)
 	return blobs, err
 }
 
diff --git a/internal/storage/data_codec.go b/internal/storage/data_codec.go
index 82ece3f2b2cc1..7c19da6ba4d63 100644
--- a/internal/storage/data_codec.go
+++ b/internal/storage/data_codec.go
@@ -35,8 +35,6 @@ import (
 const (
 	// Ts is blob key "ts"
 	Ts = "ts"
-	// Pk is blob key "pk"
-	Pk = "pk"
 	// DDL is blob key "ddl"
 	DDL = "ddl"
 	// IndexParamsKey is blob key "indexParams"
diff --git a/internal/storage/serde_events.go b/internal/storage/serde_events.go
index ada9db8806483..7655d1252e49d 100644
--- a/internal/storage/serde_events.go
+++ b/internal/storage/serde_events.go
@@ -36,16 +36,6 @@ import (
 	"github.com/milvus-io/milvus/pkg/util/typeutil"
 )
 
-type StreamWriter interface {
-	GetRecordWriter() (RecordWriter, error)
-	Finalize() (*Blob, error)
-	WriteHeaders(w io.Writer) error
-}
-
-var _ StreamWriter = (*BinlogStreamWriter)(nil)
-
-var _ StreamWriter = (*DeltalogStreamWriter)(nil)
-
 var _ RecordReader = (*compositeBinlogRecordReader)(nil)
 
 type compositeBinlogRecordReader struct {
@@ -304,7 +294,7 @@ func (bsw *BinlogStreamWriter) Finalize() (*Blob, error) {
 	bsw.rw.Close()
 
 	var b bytes.Buffer
-	if err := bsw.WriteHeaders(&b); err != nil {
+	if err := bsw.writeBinlogHeaders(&b); err != nil {
 		return nil, err
 	}
 	if _, err := b.Write(bsw.buf.Bytes()); err != nil {
@@ -318,7 +308,7 @@ func (bsw *BinlogStreamWriter) Finalize() (*Blob, error) {
 	}, nil
 }
 
-func (bsw *BinlogStreamWriter) WriteHeaders(w io.Writer) error {
+func (bsw *BinlogStreamWriter) writeBinlogHeaders(w io.Writer) error {
 	// Write magic number
 	if err := binary.Write(w, common.Endian, MagicNumber); err != nil {
 		return err
@@ -426,11 +416,6 @@ func NewBinlogSerializeWriter(schema *schemapb.CollectionSchema, partitionID, se
 	}, batchSize), nil
 }
 
-type DeltalogStreamWriterV2 struct {
-	pkStreamWriter *DeltalogStreamWriter
-	tsStreamWriter *DeltalogStreamWriter
-}
-
 type DeltalogStreamWriter struct {
 	collectionID UniqueID
 	partitionID  UniqueID
@@ -465,7 +450,7 @@ func (dsw *DeltalogStreamWriter) Finalize() (*Blob, error) {
 	dsw.rw.Close()
 
 	var b bytes.Buffer
-	if err := dsw.WriteHeaders(&b); err != nil {
+	if err := dsw.writeDeltalogHeaders(&b); err != nil {
 		return nil, err
 	}
 	if _, err := b.Write(dsw.buf.Bytes()); err != nil {
@@ -478,7 +463,7 @@ func (dsw *DeltalogStreamWriter) Finalize() (*Blob, error) {
 	}, nil
 }
 
-func (dsw *DeltalogStreamWriter) WriteHeaders(w io.Writer) error {
+func (dsw *DeltalogStreamWriter) writeDeltalogHeaders(w io.Writer) error {
 	// Write magic number
 	if err := binary.Write(w, common.Endian, MagicNumber); err != nil {
 		return err
diff --git a/internal/storage/serde_events_test.go b/internal/storage/serde_events_test.go
index 651f660f30433..25aee6adbbc69 100644
--- a/internal/storage/serde_events_test.go
+++ b/internal/storage/serde_events_test.go
@@ -40,9 +40,15 @@ func TestBinlogDeserializeReader(t *testing.T) {
 		defer reader.Close()
 		err = reader.Next()
 		assert.Equal(t, io.EOF, err)
+
+		// blobs := generateTestData(t, 0)
+		// reader, err = NewBinlogDeserializeReader(blobs, common.RowIDField)
+		// assert.NoError(t, err)
+		// err = reader.Next()
+		// assert.Equal(t, io.EOF, err)
 	})
 
-	t.Run("test binlog deserialize", func(t *testing.T) {
+	t.Run("test deserialize", func(t *testing.T) {
 		size := 3
 		blobs, err := generateTestData(size)
 		assert.NoError(t, err)
@@ -116,7 +122,7 @@ func TestBinlogSerializeWriter(t *testing.T) {
 		assert.Equal(t, io.EOF, err)
 	})
 
-	t.Run("test binlog serialize", func(t *testing.T) {
+	t.Run("test serialize", func(t *testing.T) {
 		size := 16
 		blobs, err := generateTestData(size)
 		assert.NoError(t, err)
@@ -266,7 +272,7 @@ func TestDeltalogDeserializeReader(t *testing.T) {
 		assert.Equal(t, io.EOF, err)
 	})
 
-	t.Run("test deltalog deserialize", func(t *testing.T) {
+	t.Run("test deserialize", func(t *testing.T) {
 		size := 3
 		blob, err := generateTestDeltalogData(size, false)
 		assert.NoError(t, err)
@@ -296,7 +302,7 @@ func TestDeltalogSerializeWriter(t *testing.T) {
 		assert.Equal(t, io.EOF, err)
 	})
 
-	t.Run("test deltalog serialize", func(t *testing.T) {
+	t.Run("test serialize", func(t *testing.T) {
 		size := 16
 		blob, err := generateTestDeltalogData(size, false)
 		assert.NoError(t, err)
@@ -351,7 +357,7 @@ func TestDeltalogDeserializeReaderV2(t *testing.T) {
 		assert.Equal(t, io.EOF, err)
 	})
 
-	t.Run("test deltalog deserialize v2", func(t *testing.T) {
+	t.Run("test deserialize v2", func(t *testing.T) {
 		size := 3
 		blob, err := generateTestDeltalogData(size, true)
 		assert.NoError(t, err)
@@ -381,7 +387,7 @@ func TestDeltalogSerializeWriterV2(t *testing.T) {
 		assert.Equal(t, io.EOF, err)
 	})
 
-	t.Run("test deltalog serialize v2", func(t *testing.T) {
+	t.Run("test serialize v2", func(t *testing.T) {
 		size := 16
 		blobs, err := generateTestDeltalogData(size, true)
 		assert.NoError(t, err)
diff --git a/pkg/common/common.go b/pkg/common/common.go
index 0290d6c376fb5..5bd3aabc3c1d5 100644
--- a/pkg/common/common.go
+++ b/pkg/common/common.go
@@ -43,18 +43,12 @@ const (
 	// TimeStampField is the ID of the Timestamp field reserved by the system
 	TimeStampField = 1
 
-	// PrimaryKeyField is the ID of the PrimaryKey field reserved by the system
-	PrimaryKeyField = 2
-
 	// RowIDFieldName defines the name of the RowID field
 	RowIDFieldName = "RowID"
 
 	// TimeStampFieldName defines the name of the Timestamp field
 	TimeStampFieldName = "Timestamp"
 
-	// PrimaryKeyFieldName defines the name of the Timestamp field
-	PrimaryKeyFieldName = "PrimaryKey"
-
 	// MetaFieldName is the field name of dynamic schema
 	MetaFieldName = "$meta"