diff --git a/internal/querynode/search_service.go b/internal/querynode/search_service.go
index 4503449189..6642eed1ff 100644
--- a/internal/querynode/search_service.go
+++ b/internal/querynode/search_service.go
@@ -291,9 +291,9 @@ func (ss *searchService) search(msg msgstream.TsMsg) error {
 
 	inReduced := make([]bool, len(searchResults))
 	numSegment := int64(len(searchResults))
-	err2 := reduceSearchResults(searchResults, numSegment, inReduced)
-	if err2 != nil {
-		return err2
+	err = reduceSearchResults(searchResults, numSegment, inReduced)
+	if err != nil {
+		return err
 	}
 	err = fillTargetEntry(plan, searchResults, matchedSegments, inReduced)
 	if err != nil {
diff --git a/internal/storage/binlog_reader.go b/internal/storage/binlog_reader.go
index f51943c9eb..3bdfa884ec 100644
--- a/internal/storage/binlog_reader.go
+++ b/internal/storage/binlog_reader.go
@@ -11,24 +11,15 @@ import (
 type BinlogReader struct {
 	magicNumber int32
 	descriptorEvent
-	currentEventReader *EventReader
-	buffer             *bytes.Buffer
-	bufferLength       int
-	currentOffset      int32
-	isClose            bool
+	buffer    *bytes.Buffer
+	eventList []*EventReader
+	isClose   bool
 }
 
 func (reader *BinlogReader) NextEventReader() (*EventReader, error) {
 	if reader.isClose {
 		return nil, errors.New("bin log reader is closed")
 	}
-	if reader.currentEventReader != nil {
-		reader.currentOffset = reader.currentEventReader.NextPosition
-		if err := reader.currentEventReader.Close(); err != nil {
-			return nil, err
-		}
-		reader.currentEventReader = nil
-	}
 	if reader.buffer.Len() <= 0 {
 		return nil, nil
 	}
@@ -36,15 +27,14 @@ func (reader *BinlogReader) NextEventReader() (*EventReader, error) {
 	if err != nil {
 		return nil, err
 	}
-	reader.currentEventReader = eventReader
-	return reader.currentEventReader, nil
+	reader.eventList = append(reader.eventList, eventReader)
+	return eventReader, nil
 }
 
 func (reader *BinlogReader) readMagicNumber() (int32, error) {
 	if err := binary.Read(reader.buffer, binary.LittleEndian, &reader.magicNumber); err != nil {
 		return -1, err
 	}
-	reader.currentOffset = 4
 	if reader.magicNumber != MagicNumber {
 		return -1, errors.New("parse magic number failed, expected: " + strconv.Itoa(int(MagicNumber)) +
 			", actual: " + strconv.Itoa(int(reader.magicNumber)))
@@ -55,7 +45,6 @@ func (reader *BinlogReader) readMagicNumber() (int32, error) {
 
 func (reader *BinlogReader) readDescriptorEvent() (*descriptorEvent, error) {
 	event, err := ReadDescriptorEvent(reader.buffer)
-	reader.currentOffset = event.NextPosition
 	if err != nil {
 		return nil, err
 	}
@@ -67,20 +56,20 @@ func (reader *BinlogReader) Close() error {
 	if reader.isClose {
 		return nil
 	}
-	reader.isClose = true
-	if reader.currentEventReader != nil {
-		if err := reader.currentEventReader.Close(); err != nil {
+	for _, e := range reader.eventList {
+		if err := e.Close(); err != nil {
 			return err
 		}
 	}
+	reader.isClose = true
 	return nil
 }
 
 func NewBinlogReader(data []byte) (*BinlogReader, error) {
 	reader := &BinlogReader{
-		buffer:       bytes.NewBuffer(data),
-		bufferLength: len(data),
-		isClose:      false,
+		buffer:    bytes.NewBuffer(data),
+		eventList: []*EventReader{},
+		isClose:   false,
 	}
 
 	if _, err := reader.readMagicNumber(); err != nil {
diff --git a/internal/storage/binlog_test.go b/internal/storage/binlog_test.go
index 75ff432ab2..0ca7dd47f7 100644
--- a/internal/storage/binlog_test.go
+++ b/internal/storage/binlog_test.go
@@ -241,4 +241,812 @@ func TestInsertBinlog(t *testing.T) {
 
 	assert.Equal(t, int(e2NxtPos), len(buf))
 
+	//read binlog
+	r, err := NewBinlogReader(buf)
+	assert.Nil(t, err)
+	event1, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event1)
+	p1, err := event1.GetInt64FromPayload()
+	assert.Equal(t, p1, []int64{1, 2, 3, 4, 5, 6})
+	assert.Nil(t, err)
+	assert.Equal(t, event1.TypeCode, InsertEventType)
+	ed1, ok := (event1.eventData).(*insertEventData)
+	assert.True(t, ok)
+	assert.Equal(t, ed1.StartTimestamp, Timestamp(100))
+	assert.Equal(t, ed1.EndTimestamp, Timestamp(200))
+
+	event2, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event2)
+	p2, err := event2.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, p2, []int64{7, 8, 9, 10, 11, 12})
+	assert.Equal(t, event2.TypeCode, InsertEventType)
+	ed2, ok := (event2.eventData).(*insertEventData)
+	assert.True(t, ok)
+	_, ok = (event2.eventData).(*deleteEventData)
+	assert.False(t, ok)
+	assert.Equal(t, ed2.StartTimestamp, Timestamp(300))
+	assert.Equal(t, ed2.EndTimestamp, Timestamp(400))
+}
+
+func TestDeleteBinlog(t *testing.T) {
+	w, err := NewDeleteBinlogWriter(schemapb.DataType_INT64, 50)
+	assert.Nil(t, err)
+
+	e1, err := w.NextDeleteEventWriter()
+	assert.Nil(t, err)
+	err = e1.AddDataToPayload([]int64{1, 2, 3})
+	assert.Nil(t, err)
+	err = e1.AddDataToPayload([]int32{4, 5, 6})
+	assert.NotNil(t, err)
+	err = e1.AddDataToPayload([]int64{4, 5, 6})
+	assert.Nil(t, err)
+	e1.SetStartTimestamp(100)
+	e1.SetEndTimestamp(200)
+
+	e2, err := w.NextDeleteEventWriter()
+	assert.Nil(t, err)
+	err = e2.AddDataToPayload([]int64{7, 8, 9})
+	assert.Nil(t, err)
+	err = e2.AddDataToPayload([]bool{true, false, true})
+	assert.NotNil(t, err)
+	err = e2.AddDataToPayload([]int64{10, 11, 12})
+	assert.Nil(t, err)
+	e2.SetStartTimestamp(300)
+	e2.SetEndTimestamp(400)
+
+	w.SetStartTimeStamp(1000)
+	w.SetEndTimeStamp(2000)
+
+	_, err = w.GetBuffer()
+	assert.NotNil(t, err)
+	err = w.Close()
+	assert.Nil(t, err)
+	buf, err := w.GetBuffer()
+	assert.Nil(t, err)
+
+	//magic number
+	magicNum := UnsafeReadInt32(buf, 0)
+	assert.Equal(t, magicNum, MagicNumber)
+	pos := int(unsafe.Sizeof(MagicNumber))
+
+	//descriptor header, timestamp
+	ts := UnsafeReadInt64(buf, pos)
+	assert.Greater(t, ts, int64(0))
+	curts := time.Now().UnixNano() / int64(time.Millisecond)
+	curts = int64(tsoutil.ComposeTS(curts, 0))
+	diffts := curts - ts
+	maxdiff := int64(tsoutil.ComposeTS(1000, 0))
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(ts))
+
+	//descriptor header, type code
+	tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(tc), DescriptorEventType)
+	pos += int(unsafe.Sizeof(tc))
+
+	//descriptor header, server id
+	svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(svrID))
+
+	//descriptor header, event length
+	descEventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(descEventLen))
+
+	//descriptor header, next position
+	descNxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, descEventLen+int32(unsafe.Sizeof(MagicNumber)), descNxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//descriptor data fix, binlog version
+	binLogVer := UnsafeReadInt16(buf, pos)
+	assert.Equal(t, binLogVer, int16(BinlogVersion))
+	pos += int(unsafe.Sizeof(binLogVer))
+
+	//descriptor data fix, server version
+	svrVer := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, svrVer, int64(ServerVersion))
+	pos += int(unsafe.Sizeof(svrVer))
+
+	//descriptor data fix, commit id
+	cmitID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, cmitID, int64(CommitID))
+	pos += int(unsafe.Sizeof(cmitID))
+
+	//descriptor data fix, header length
+	headLen := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, headLen, int8(binary.Size(eventHeader{})))
+	pos += int(unsafe.Sizeof(headLen))
+
+	//descriptor data fix, collection id
+	collID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, collID, int64(50))
+	pos += int(unsafe.Sizeof(collID))
+
+	//descriptor data fix, partition id
+	partID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, partID, int64(-1))
+	pos += int(unsafe.Sizeof(partID))
+
+	//descriptor data fix, segment id
+	segID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, segID, int64(-1))
+	pos += int(unsafe.Sizeof(segID))
+
+	//descriptor data fix, field id
+	fieldID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, fieldID, int64(-1))
+	pos += int(unsafe.Sizeof(fieldID))
+
+	//descriptor data fix, start time stamp
+	startts := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, startts, int64(1000))
+	pos += int(unsafe.Sizeof(startts))
+
+	//descriptor data fix, end time stamp
+	endts := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, endts, int64(2000))
+	pos += int(unsafe.Sizeof(endts))
+
+	//descriptor data fix, payload type
+	colType := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, schemapb.DataType(colType), schemapb.DataType_INT64)
+	pos += int(unsafe.Sizeof(colType))
+
+	//descriptor data, post header lengths
+	for i := DescriptorEventType; i < EventTypeEnd; i++ {
+		size := getEventFixPartSize(i)
+		assert.Equal(t, uint8(size), buf[pos])
+		pos++
+	}
+
+	//start of e1
+	assert.Equal(t, pos, int(descNxtPos))
+
+	//insert e1 header, Timestamp
+	e1ts := UnsafeReadInt64(buf, pos)
+	diffts = curts - e1ts
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(e1ts))
+
+	//insert e1 header, type code
+	e1tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(e1tc), DeleteEventType)
+	pos += int(unsafe.Sizeof(e1tc))
+
+	//insert e1 header, Server id
+	e1svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e1svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(e1svrID))
+
+	//insert e1 header, event length
+	e1EventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(e1EventLen))
+
+	//insert e1 header, next position
+	e1NxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, descNxtPos+e1EventLen, e1NxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//insert e1 data, start time stamp
+	e1st := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e1st, int64(100))
+	pos += int(unsafe.Sizeof(e1st))
+
+	//insert e1 data, end time stamp
+	e1et := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e1et, int64(200))
+	pos += int(unsafe.Sizeof(e1et))
+
+	//insert e1, payload
+	e1Payload := buf[pos:e1NxtPos]
+	e1r, err := NewPayloadReader(schemapb.DataType_INT64, e1Payload)
+	assert.Nil(t, err)
+	e1a, err := e1r.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, e1a, []int64{1, 2, 3, 4, 5, 6})
+	err = e1r.Close()
+	assert.Nil(t, err)
+
+	//start of e2
+	pos = int(e1NxtPos)
+
+	//insert e2 header, Timestamp
+	e2ts := UnsafeReadInt64(buf, pos)
+	diffts = curts - e2ts
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(e2ts))
+
+	//insert e2 header, type code
+	e2tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(e2tc), DeleteEventType)
+	pos += int(unsafe.Sizeof(e2tc))
+
+	//insert e2 header, Server id
+	e2svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e2svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(e2svrID))
+
+	//insert e2 header, event length
+	e2EventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(e2EventLen))
+
+	//insert e2 header, next position
+	e2NxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e1NxtPos+e2EventLen, e2NxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//insert e2 data, start time stamp
+	e2st := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e2st, int64(300))
+	pos += int(unsafe.Sizeof(e2st))
+
+	//insert e2 data, end time stamp
+	e2et := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e2et, int64(400))
+	pos += int(unsafe.Sizeof(e2et))
+
+	//insert e2, payload
+	e2Payload := buf[pos:]
+	e2r, err := NewPayloadReader(schemapb.DataType_INT64, e2Payload)
+	assert.Nil(t, err)
+	e2a, err := e2r.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, e2a, []int64{7, 8, 9, 10, 11, 12})
+	err = e2r.Close()
+	assert.Nil(t, err)
+
+	assert.Equal(t, int(e2NxtPos), len(buf))
+
+	//read binlog
+	r, err := NewBinlogReader(buf)
+	assert.Nil(t, err)
+	event1, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event1)
+	p1, err := event1.GetInt64FromPayload()
+	assert.Equal(t, p1, []int64{1, 2, 3, 4, 5, 6})
+	assert.Nil(t, err)
+	assert.Equal(t, event1.TypeCode, DeleteEventType)
+	ed1, ok := (event1.eventData).(*deleteEventData)
+	assert.True(t, ok)
+	assert.Equal(t, ed1.StartTimestamp, Timestamp(100))
+	assert.Equal(t, ed1.EndTimestamp, Timestamp(200))
+
+	event2, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event2)
+	p2, err := event2.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, p2, []int64{7, 8, 9, 10, 11, 12})
+	assert.Equal(t, event2.TypeCode, DeleteEventType)
+	ed2, ok := (event2.eventData).(*deleteEventData)
+	assert.True(t, ok)
+	_, ok = (event2.eventData).(*insertEventData)
+	assert.False(t, ok)
+	assert.Equal(t, ed2.StartTimestamp, Timestamp(300))
+	assert.Equal(t, ed2.EndTimestamp, Timestamp(400))
+}
+
+func TestDDLBinlog1(t *testing.T) {
+	w, err := NewDDLBinlogWriter(schemapb.DataType_INT64, 50)
+	assert.Nil(t, err)
+
+	e1, err := w.NextCreateCollectionEventWriter()
+	assert.Nil(t, err)
+	err = e1.AddDataToPayload([]int64{1, 2, 3})
+	assert.Nil(t, err)
+	err = e1.AddDataToPayload([]int32{4, 5, 6})
+	assert.NotNil(t, err)
+	err = e1.AddDataToPayload([]int64{4, 5, 6})
+	assert.Nil(t, err)
+	e1.SetStartTimestamp(100)
+	e1.SetEndTimestamp(200)
+
+	e2, err := w.NextDropCollectionEventWriter()
+	assert.Nil(t, err)
+	err = e2.AddDataToPayload([]int64{7, 8, 9})
+	assert.Nil(t, err)
+	err = e2.AddDataToPayload([]bool{true, false, true})
+	assert.NotNil(t, err)
+	err = e2.AddDataToPayload([]int64{10, 11, 12})
+	assert.Nil(t, err)
+	e2.SetStartTimestamp(300)
+	e2.SetEndTimestamp(400)
+
+	w.SetStartTimeStamp(1000)
+	w.SetEndTimeStamp(2000)
+
+	_, err = w.GetBuffer()
+	assert.NotNil(t, err)
+	err = w.Close()
+	assert.Nil(t, err)
+	buf, err := w.GetBuffer()
+	assert.Nil(t, err)
+
+	//magic number
+	magicNum := UnsafeReadInt32(buf, 0)
+	assert.Equal(t, magicNum, MagicNumber)
+	pos := int(unsafe.Sizeof(MagicNumber))
+
+	//descriptor header, timestamp
+	ts := UnsafeReadInt64(buf, pos)
+	assert.Greater(t, ts, int64(0))
+	curts := time.Now().UnixNano() / int64(time.Millisecond)
+	curts = int64(tsoutil.ComposeTS(curts, 0))
+	diffts := curts - ts
+	maxdiff := int64(tsoutil.ComposeTS(1000, 0))
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(ts))
+
+	//descriptor header, type code
+	tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(tc), DescriptorEventType)
+	pos += int(unsafe.Sizeof(tc))
+
+	//descriptor header, server id
+	svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(svrID))
+
+	//descriptor header, event length
+	descEventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(descEventLen))
+
+	//descriptor header, next position
+	descNxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, descEventLen+int32(unsafe.Sizeof(MagicNumber)), descNxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//descriptor data fix, binlog version
+	binLogVer := UnsafeReadInt16(buf, pos)
+	assert.Equal(t, binLogVer, int16(BinlogVersion))
+	pos += int(unsafe.Sizeof(binLogVer))
+
+	//descriptor data fix, server version
+	svrVer := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, svrVer, int64(ServerVersion))
+	pos += int(unsafe.Sizeof(svrVer))
+
+	//descriptor data fix, commit id
+	cmitID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, cmitID, int64(CommitID))
+	pos += int(unsafe.Sizeof(cmitID))
+
+	//descriptor data fix, header length
+	headLen := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, headLen, int8(binary.Size(eventHeader{})))
+	pos += int(unsafe.Sizeof(headLen))
+
+	//descriptor data fix, collection id
+	collID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, collID, int64(50))
+	pos += int(unsafe.Sizeof(collID))
+
+	//descriptor data fix, partition id
+	partID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, partID, int64(-1))
+	pos += int(unsafe.Sizeof(partID))
+
+	//descriptor data fix, segment id
+	segID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, segID, int64(-1))
+	pos += int(unsafe.Sizeof(segID))
+
+	//descriptor data fix, field id
+	fieldID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, fieldID, int64(-1))
+	pos += int(unsafe.Sizeof(fieldID))
+
+	//descriptor data fix, start time stamp
+	startts := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, startts, int64(1000))
+	pos += int(unsafe.Sizeof(startts))
+
+	//descriptor data fix, end time stamp
+	endts := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, endts, int64(2000))
+	pos += int(unsafe.Sizeof(endts))
+
+	//descriptor data fix, payload type
+	colType := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, schemapb.DataType(colType), schemapb.DataType_INT64)
+	pos += int(unsafe.Sizeof(colType))
+
+	//descriptor data, post header lengths
+	for i := DescriptorEventType; i < EventTypeEnd; i++ {
+		size := getEventFixPartSize(i)
+		assert.Equal(t, uint8(size), buf[pos])
+		pos++
+	}
+
+	//start of e1
+	assert.Equal(t, pos, int(descNxtPos))
+
+	//insert e1 header, Timestamp
+	e1ts := UnsafeReadInt64(buf, pos)
+	diffts = curts - e1ts
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(e1ts))
+
+	//insert e1 header, type code
+	e1tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(e1tc), CreateCollectionEventType)
+	pos += int(unsafe.Sizeof(e1tc))
+
+	//insert e1 header, Server id
+	e1svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e1svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(e1svrID))
+
+	//insert e1 header, event length
+	e1EventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(e1EventLen))
+
+	//insert e1 header, next position
+	e1NxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, descNxtPos+e1EventLen, e1NxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//insert e1 data, start time stamp
+	e1st := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e1st, int64(100))
+	pos += int(unsafe.Sizeof(e1st))
+
+	//insert e1 data, end time stamp
+	e1et := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e1et, int64(200))
+	pos += int(unsafe.Sizeof(e1et))
+
+	//insert e1, payload
+	e1Payload := buf[pos:e1NxtPos]
+	e1r, err := NewPayloadReader(schemapb.DataType_INT64, e1Payload)
+	assert.Nil(t, err)
+	e1a, err := e1r.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, e1a, []int64{1, 2, 3, 4, 5, 6})
+	err = e1r.Close()
+	assert.Nil(t, err)
+
+	//start of e2
+	pos = int(e1NxtPos)
+
+	//insert e2 header, Timestamp
+	e2ts := UnsafeReadInt64(buf, pos)
+	diffts = curts - e2ts
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(e2ts))
+
+	//insert e2 header, type code
+	e2tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(e2tc), DropCollectionEventType)
+	pos += int(unsafe.Sizeof(e2tc))
+
+	//insert e2 header, Server id
+	e2svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e2svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(e2svrID))
+
+	//insert e2 header, event length
+	e2EventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(e2EventLen))
+
+	//insert e2 header, next position
+	e2NxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e1NxtPos+e2EventLen, e2NxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//insert e2 data, start time stamp
+	e2st := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e2st, int64(300))
+	pos += int(unsafe.Sizeof(e2st))
+
+	//insert e2 data, end time stamp
+	e2et := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e2et, int64(400))
+	pos += int(unsafe.Sizeof(e2et))
+
+	//insert e2, payload
+	e2Payload := buf[pos:]
+	e2r, err := NewPayloadReader(schemapb.DataType_INT64, e2Payload)
+	assert.Nil(t, err)
+	e2a, err := e2r.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, e2a, []int64{7, 8, 9, 10, 11, 12})
+	err = e2r.Close()
+	assert.Nil(t, err)
+
+	assert.Equal(t, int(e2NxtPos), len(buf))
+
+	//read binlog
+	r, err := NewBinlogReader(buf)
+	assert.Nil(t, err)
+	event1, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event1)
+	p1, err := event1.GetInt64FromPayload()
+	assert.Equal(t, p1, []int64{1, 2, 3, 4, 5, 6})
+	assert.Nil(t, err)
+	assert.Equal(t, event1.TypeCode, CreateCollectionEventType)
+	ed1, ok := (event1.eventData).(*createCollectionEventData)
+	assert.True(t, ok)
+	assert.Equal(t, ed1.StartTimestamp, Timestamp(100))
+	assert.Equal(t, ed1.EndTimestamp, Timestamp(200))
+
+	event2, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event2)
+	p2, err := event2.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, p2, []int64{7, 8, 9, 10, 11, 12})
+	assert.Equal(t, event2.TypeCode, DropCollectionEventType)
+	ed2, ok := (event2.eventData).(*dropCollectionEventData)
+	assert.True(t, ok)
+	_, ok = (event2.eventData).(*insertEventData)
+	assert.False(t, ok)
+	assert.Equal(t, ed2.StartTimestamp, Timestamp(300))
+	assert.Equal(t, ed2.EndTimestamp, Timestamp(400))
+}
+
+func TestDDLBinlog2(t *testing.T) {
+	w, err := NewDDLBinlogWriter(schemapb.DataType_INT64, 50)
+	assert.Nil(t, err)
+
+	e1, err := w.NextCreatePartitionEventWriter()
+	assert.Nil(t, err)
+	err = e1.AddDataToPayload([]int64{1, 2, 3})
+	assert.Nil(t, err)
+	err = e1.AddDataToPayload([]int32{4, 5, 6})
+	assert.NotNil(t, err)
+	err = e1.AddDataToPayload([]int64{4, 5, 6})
+	assert.Nil(t, err)
+	e1.SetStartTimestamp(100)
+	e1.SetEndTimestamp(200)
+
+	e2, err := w.NextDropPartitionEventWriter()
+	assert.Nil(t, err)
+	err = e2.AddDataToPayload([]int64{7, 8, 9})
+	assert.Nil(t, err)
+	err = e2.AddDataToPayload([]bool{true, false, true})
+	assert.NotNil(t, err)
+	err = e2.AddDataToPayload([]int64{10, 11, 12})
+	assert.Nil(t, err)
+	e2.SetStartTimestamp(300)
+	e2.SetEndTimestamp(400)
+
+	w.SetStartTimeStamp(1000)
+	w.SetEndTimeStamp(2000)
+
+	_, err = w.GetBuffer()
+	assert.NotNil(t, err)
+	err = w.Close()
+	assert.Nil(t, err)
+	buf, err := w.GetBuffer()
+	assert.Nil(t, err)
+
+	//magic number
+	magicNum := UnsafeReadInt32(buf, 0)
+	assert.Equal(t, magicNum, MagicNumber)
+	pos := int(unsafe.Sizeof(MagicNumber))
+
+	//descriptor header, timestamp
+	ts := UnsafeReadInt64(buf, pos)
+	assert.Greater(t, ts, int64(0))
+	curts := time.Now().UnixNano() / int64(time.Millisecond)
+	curts = int64(tsoutil.ComposeTS(curts, 0))
+	diffts := curts - ts
+	maxdiff := int64(tsoutil.ComposeTS(1000, 0))
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(ts))
+
+	//descriptor header, type code
+	tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(tc), DescriptorEventType)
+	pos += int(unsafe.Sizeof(tc))
+
+	//descriptor header, server id
+	svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(svrID))
+
+	//descriptor header, event length
+	descEventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(descEventLen))
+
+	//descriptor header, next position
+	descNxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, descEventLen+int32(unsafe.Sizeof(MagicNumber)), descNxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//descriptor data fix, binlog version
+	binLogVer := UnsafeReadInt16(buf, pos)
+	assert.Equal(t, binLogVer, int16(BinlogVersion))
+	pos += int(unsafe.Sizeof(binLogVer))
+
+	//descriptor data fix, server version
+	svrVer := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, svrVer, int64(ServerVersion))
+	pos += int(unsafe.Sizeof(svrVer))
+
+	//descriptor data fix, commit id
+	cmitID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, cmitID, int64(CommitID))
+	pos += int(unsafe.Sizeof(cmitID))
+
+	//descriptor data fix, header length
+	headLen := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, headLen, int8(binary.Size(eventHeader{})))
+	pos += int(unsafe.Sizeof(headLen))
+
+	//descriptor data fix, collection id
+	collID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, collID, int64(50))
+	pos += int(unsafe.Sizeof(collID))
+
+	//descriptor data fix, partition id
+	partID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, partID, int64(-1))
+	pos += int(unsafe.Sizeof(partID))
+
+	//descriptor data fix, segment id
+	segID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, segID, int64(-1))
+	pos += int(unsafe.Sizeof(segID))
+
+	//descriptor data fix, field id
+	fieldID := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, fieldID, int64(-1))
+	pos += int(unsafe.Sizeof(fieldID))
+
+	//descriptor data fix, start time stamp
+	startts := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, startts, int64(1000))
+	pos += int(unsafe.Sizeof(startts))
+
+	//descriptor data fix, end time stamp
+	endts := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, endts, int64(2000))
+	pos += int(unsafe.Sizeof(endts))
+
+	//descriptor data fix, payload type
+	colType := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, schemapb.DataType(colType), schemapb.DataType_INT64)
+	pos += int(unsafe.Sizeof(colType))
+
+	//descriptor data, post header lengths
+	for i := DescriptorEventType; i < EventTypeEnd; i++ {
+		size := getEventFixPartSize(i)
+		assert.Equal(t, uint8(size), buf[pos])
+		pos++
+	}
+
+	//start of e1
+	assert.Equal(t, pos, int(descNxtPos))
+
+	//insert e1 header, Timestamp
+	e1ts := UnsafeReadInt64(buf, pos)
+	diffts = curts - e1ts
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(e1ts))
+
+	//insert e1 header, type code
+	e1tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(e1tc), CreatePartitionEventType)
+	pos += int(unsafe.Sizeof(e1tc))
+
+	//insert e1 header, Server id
+	e1svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e1svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(e1svrID))
+
+	//insert e1 header, event length
+	e1EventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(e1EventLen))
+
+	//insert e1 header, next position
+	e1NxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, descNxtPos+e1EventLen, e1NxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//insert e1 data, start time stamp
+	e1st := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e1st, int64(100))
+	pos += int(unsafe.Sizeof(e1st))
+
+	//insert e1 data, end time stamp
+	e1et := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e1et, int64(200))
+	pos += int(unsafe.Sizeof(e1et))
+
+	//insert e1, payload
+	e1Payload := buf[pos:e1NxtPos]
+	e1r, err := NewPayloadReader(schemapb.DataType_INT64, e1Payload)
+	assert.Nil(t, err)
+	e1a, err := e1r.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, e1a, []int64{1, 2, 3, 4, 5, 6})
+	err = e1r.Close()
+	assert.Nil(t, err)
+
+	//start of e2
+	pos = int(e1NxtPos)
+
+	//insert e2 header, Timestamp
+	e2ts := UnsafeReadInt64(buf, pos)
+	diffts = curts - e2ts
+	assert.LessOrEqual(t, diffts, maxdiff)
+	pos += int(unsafe.Sizeof(e2ts))
+
+	//insert e2 header, type code
+	e2tc := UnsafeReadInt8(buf, pos)
+	assert.Equal(t, EventTypeCode(e2tc), DropPartitionEventType)
+	pos += int(unsafe.Sizeof(e2tc))
+
+	//insert e2 header, Server id
+	e2svrID := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e2svrID, int32(ServerID))
+	pos += int(unsafe.Sizeof(e2svrID))
+
+	//insert e2 header, event length
+	e2EventLen := UnsafeReadInt32(buf, pos)
+	pos += int(unsafe.Sizeof(e2EventLen))
+
+	//insert e2 header, next position
+	e2NxtPos := UnsafeReadInt32(buf, pos)
+	assert.Equal(t, e1NxtPos+e2EventLen, e2NxtPos)
+	pos += int(unsafe.Sizeof(descNxtPos))
+
+	//insert e2 data, start time stamp
+	e2st := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e2st, int64(300))
+	pos += int(unsafe.Sizeof(e2st))
+
+	//insert e2 data, end time stamp
+	e2et := UnsafeReadInt64(buf, pos)
+	assert.Equal(t, e2et, int64(400))
+	pos += int(unsafe.Sizeof(e2et))
+
+	//insert e2, payload
+	e2Payload := buf[pos:]
+	e2r, err := NewPayloadReader(schemapb.DataType_INT64, e2Payload)
+	assert.Nil(t, err)
+	e2a, err := e2r.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, e2a, []int64{7, 8, 9, 10, 11, 12})
+	err = e2r.Close()
+	assert.Nil(t, err)
+
+	assert.Equal(t, int(e2NxtPos), len(buf))
+
+	//read binlog
+	r, err := NewBinlogReader(buf)
+	assert.Nil(t, err)
+	event1, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event1)
+	p1, err := event1.GetInt64FromPayload()
+	assert.Equal(t, p1, []int64{1, 2, 3, 4, 5, 6})
+	assert.Nil(t, err)
+	assert.Equal(t, event1.TypeCode, CreatePartitionEventType)
+	ed1, ok := (event1.eventData).(*createPartitionEventData)
+	assert.True(t, ok)
+	assert.Equal(t, ed1.StartTimestamp, Timestamp(100))
+	assert.Equal(t, ed1.EndTimestamp, Timestamp(200))
+
+	event2, err := r.NextEventReader()
+	assert.Nil(t, err)
+	assert.NotNil(t, event2)
+	p2, err := event2.GetInt64FromPayload()
+	assert.Nil(t, err)
+	assert.Equal(t, p2, []int64{7, 8, 9, 10, 11, 12})
+	assert.Equal(t, event2.TypeCode, DropPartitionEventType)
+	ed2, ok := (event2.eventData).(*dropPartitionEventData)
+	assert.True(t, ok)
+	_, ok = (event2.eventData).(*insertEventData)
+	assert.False(t, ok)
+	assert.Equal(t, ed2.StartTimestamp, Timestamp(300))
+	assert.Equal(t, ed2.EndTimestamp, Timestamp(400))
 }
diff --git a/internal/storage/binlog_writer.go b/internal/storage/binlog_writer.go
index a84faed97d..3cd12c2426 100644
--- a/internal/storage/binlog_writer.go
+++ b/internal/storage/binlog_writer.go
@@ -223,12 +223,13 @@ func NewInsertBinlogWriter(dataType schemapb.DataType, collectionID, partitionID
 		},
 	}, nil
 }
-func NewDeleteBinlogWriter(dataType schemapb.DataType) (*DeleteBinlogWriter, error) {
+func NewDeleteBinlogWriter(dataType schemapb.DataType, collectionID int64) (*DeleteBinlogWriter, error) {
 	descriptorEvent, err := newDescriptorEvent()
 	if err != nil {
 		return nil, err
 	}
 	descriptorEvent.PayloadDataType = dataType
+	descriptorEvent.CollectionID = collectionID
 	return &DeleteBinlogWriter{
 		baseBinlogWriter: baseBinlogWriter{
 			descriptorEvent: *descriptorEvent,
@@ -239,12 +240,13 @@ func NewDeleteBinlogWriter(dataType schemapb.DataType) (*DeleteBinlogWriter, err
 		},
 	}, nil
 }
-func NewDDLBinlogWriter(dataType schemapb.DataType) (*DDLBinlogWriter, error) {
+func NewDDLBinlogWriter(dataType schemapb.DataType, collectionID int64) (*DDLBinlogWriter, error) {
 	descriptorEvent, err := newDescriptorEvent()
 	if err != nil {
 		return nil, err
 	}
 	descriptorEvent.PayloadDataType = dataType
+	descriptorEvent.CollectionID = collectionID
 	return &DDLBinlogWriter{
 		baseBinlogWriter: baseBinlogWriter{
 			descriptorEvent: *descriptorEvent,
diff --git a/internal/storage/binlog_writer_test.go b/internal/storage/binlog_writer_test.go
index fd313b0df7..f88bd6bc33 100644
--- a/internal/storage/binlog_writer_test.go
+++ b/internal/storage/binlog_writer_test.go
@@ -54,6 +54,5 @@ func TestBinlogWriterReader(t *testing.T) {
 
 	reader, err := binlogReader.NextEventReader()
 	assert.Nil(t, err)
-	fmt.Println("reader offset : " + strconv.Itoa(int(binlogReader.currentOffset)))
 	assert.Nil(t, reader)
 }
diff --git a/internal/storage/data_codec.go b/internal/storage/data_codec.go
index 942f48b5a1..0537646d12 100644
--- a/internal/storage/data_codec.go
+++ b/internal/storage/data_codec.go
@@ -354,7 +354,7 @@ type DataDefinitionCodec struct {
 }
 
 func (dataDefinitionCodec *DataDefinitionCodec) Serialize(ts []Timestamp, ddRequests []string, eventTypes []EventTypeCode) ([]*Blob, error) {
-	writer, err := NewDDLBinlogWriter(schemapb.DataType_STRING)
+	writer, err := NewDDLBinlogWriter(schemapb.DataType_STRING, dataDefinitionCodec.Schema.ID)
 	if err != nil {
 		return nil, err
 	}
@@ -426,7 +426,7 @@ func (dataDefinitionCodec *DataDefinitionCodec) Serialize(ts []Timestamp, ddRequ
 		value: buffer,
 	})
 
-	writer, err = NewDDLBinlogWriter(schemapb.DataType_INT64)
+	writer, err = NewDDLBinlogWriter(schemapb.DataType_INT64, dataDefinitionCodec.Schema.ID)
 	if err != nil {
 		return nil, err
 	}