Add tests where segments load delta logs (#16825)

issue: #16821

/kind improvements
Signed-off-by: NYuchen Gao <yuchen.gao@zilliz.com>

internal/querynode/mock_test.go

@@ -18,6 +18,7 @@ package querynode
 
 import (
 	"context"
+	"encoding/binary"
 	"errors"
 	"fmt"
 	"math"
@@ -1030,6 +1031,51 @@ func saveBinLog(ctx context.Context,
 	return fieldBinlog, err
 }
 
+// saveDeltaLog saves delta logs into MinIO for testing purpose.
+func saveDeltaLog(collectionID UniqueID,
+	partitionID UniqueID,
+	segmentID UniqueID) ([]*datapb.FieldBinlog, error) {
+
+	binlogWriter := storage.NewDeleteBinlogWriter(schemapb.DataType_String, collectionID, partitionID, segmentID)
+	eventWriter, _ := binlogWriter.NextDeleteEventWriter()
+	dData := &storage.DeleteData{
+		Pks:      []storage.PrimaryKey{&storage.Int64PrimaryKey{Value: 1}, &storage.Int64PrimaryKey{Value: 2}},
+		Tss:      []Timestamp{100, 200},
+		RowCount: 2,
+	}
+
+	sizeTotal := 0
+	for i := int64(0); i < dData.RowCount; i++ {
+		int64PkValue := dData.Pks[i].(*storage.Int64PrimaryKey).Value
+		ts := dData.Tss[i]
+		eventWriter.AddOneStringToPayload(fmt.Sprintf("%d,%d", int64PkValue, ts))
+		sizeTotal += binary.Size(int64PkValue)
+		sizeTotal += binary.Size(ts)
+	}
+	eventWriter.SetEventTimestamp(100, 200)
+	binlogWriter.SetEventTimeStamp(100, 200)
+	binlogWriter.AddExtra("original_size", fmt.Sprintf("%v", sizeTotal))
+
+	binlogWriter.Finish()
+	buffer, _ := binlogWriter.GetBuffer()
+	blob := &storage.Blob{Key: "deltaLogPath1", Value: buffer}
+
+	kvs := make(map[string][]byte, 1)
+
+	// write insert binlog
+	fieldBinlog := make([]*datapb.FieldBinlog, 0)
+	log.Debug("[query node unittest] save delta log", zap.Int64("fieldID", 999))
+	key := JoinIDPath(collectionID, partitionID, segmentID, 999)
+	kvs[key] = blob.Value[:]
+	fieldBinlog = append(fieldBinlog, &datapb.FieldBinlog{
+		FieldID: 999,
+		Binlogs: []*datapb.Binlog{{LogPath: key}},
+	})
+	log.Debug("[query node unittest] save delta log file to MinIO/S3")
+
+	return fieldBinlog, storage.NewLocalChunkManager(storage.RootPath(defaultLocalStorage)).MultiWrite(kvs)
+}
+
 func genSimpleTimestampFieldData(numRows int) []Timestamp {
 	times := make([]Timestamp, numRows)
 	for i := 0; i < numRows; i++ {

internal/querynode/segment_loader.go

@@ -575,13 +575,13 @@ func (loader *segmentLoader) loadDeltaLogs(segment *Segment, deltaLogs []*datapb
 	dCodec := storage.DeleteCodec{}
 	var blobs []*storage.Blob
 	for _, deltaLog := range deltaLogs {
-		for _, log := range deltaLog.GetBinlogs() {
-			value, err := loader.cm.Read(log.GetLogPath())
+		for _, bLog := range deltaLog.GetBinlogs() {
+			value, err := loader.cm.Read(bLog.GetLogPath())
 			if err != nil {
 				return err
 			}
 			blob := &storage.Blob{
-				Key:   log.GetLogPath(),
+				Key:   bLog.GetLogPath(),
 				Value: value,
 			}
 			blobs = append(blobs, blob)

internal/querynode/segment_loader_test.go

@@ -427,6 +427,9 @@ func TestSegmentLoader_testLoadGrowingAndSealed(t *testing.T) {
 	fieldBinlog, err := saveBinLog(ctx, defaultCollectionID, defaultPartitionID, defaultSegmentID, defaultMsgLength, schema)
 	assert.NoError(t, err)
 
+	deltaLogs, err := saveDeltaLog(defaultCollectionID, defaultPartitionID, defaultSegmentID)
+	assert.NoError(t, err)
+
 	t.Run("test load growing and sealed segments", func(t *testing.T) {
 		node, err := genSimpleQueryNode(ctx)
 		assert.NoError(t, err)
@@ -448,6 +451,7 @@ func TestSegmentLoader_testLoadGrowingAndSealed(t *testing.T) {
 					PartitionID:  defaultPartitionID,
 					CollectionID: defaultCollectionID,
 					BinlogPaths:  fieldBinlog,
+					Deltalogs:    deltaLogs,
 				},
 			},
 		}
@@ -483,6 +487,30 @@ func TestSegmentLoader_testLoadGrowingAndSealed(t *testing.T) {
 		assert.NoError(t, err)
 
 		assert.Equal(t, segment1.getRowCount(), segment2.getRowCount())
+
+		// Loading growing segments with delta log, expect to fail (this is a bug).
+		// See: https://github.com/milvus-io/milvus/issues/16821
+		segmentID3 := UniqueID(102)
+		req3 := &querypb.LoadSegmentsRequest{
+			Base: &commonpb.MsgBase{
+				MsgType: commonpb.MsgType_WatchQueryChannels,
+				MsgID:   rand.Int63(),
+			},
+			DstNodeID: 0,
+			Schema:    schema,
+			Infos: []*querypb.SegmentLoadInfo{
+				{
+					SegmentID:    segmentID3,
+					PartitionID:  defaultPartitionID,
+					CollectionID: defaultCollectionID,
+					BinlogPaths:  fieldBinlog,
+					Deltalogs:    deltaLogs,
+				},
+			},
+		}
+
+		err = loader.loadSegment(req3, segmentTypeGrowing)
+		assert.Error(t, err)
 	})
 }