milvus/internal/datanode/writebuffer/l0_write_buffer.go

package writebuffer

import (
	"context"

	"github.com/samber/lo"
	"go.uber.org/zap"

	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
	"github.com/milvus-io/milvus-proto/go-api/v2/msgpb"
	"github.com/milvus-io/milvus/internal/allocator"
	"github.com/milvus-io/milvus/internal/datanode/metacache"
	"github.com/milvus-io/milvus/internal/datanode/syncmgr"
	"github.com/milvus-io/milvus/internal/proto/datapb"
	"github.com/milvus-io/milvus/internal/storage"
	"github.com/milvus-io/milvus/pkg/common"
	"github.com/milvus-io/milvus/pkg/mq/msgstream"
	"github.com/milvus-io/milvus/pkg/util/merr"
	"github.com/milvus-io/milvus/pkg/util/retry"
	"github.com/milvus-io/milvus/pkg/util/typeutil"
)

type l0WriteBuffer struct {
	*writeBufferBase

	l0Segments  map[int64]int64 // partitionID => l0 segment ID
	l0partition map[int64]int64 // l0 segment id => partition id

	syncMgr     syncmgr.SyncManager
	idAllocator allocator.Interface
}

func NewL0WriteBuffer(channel string, metacache metacache.MetaCache, storageV2Cache *metacache.StorageV2Cache, syncMgr syncmgr.SyncManager, option *writeBufferOption) (WriteBuffer, error) {
	if option.idAllocator == nil {
		return nil, merr.WrapErrServiceInternal("id allocator is nil when creating l0 write buffer")
	}
	base, err := newWriteBufferBase(channel, metacache, storageV2Cache, syncMgr, option)
	if err != nil {
		return nil, err
	}
	return &l0WriteBuffer{
		l0Segments:      make(map[int64]int64),
		l0partition:     make(map[int64]int64),
		writeBufferBase: base,
		syncMgr:         syncMgr,
		idAllocator:     option.idAllocator,
	}, nil
}

func (wb *l0WriteBuffer) dispatchDeleteMsgs(groups []*inData, deleteMsgs []*msgstream.DeleteMsg, startPos, endPos *msgpb.MsgPosition) {
	for _, delMsg := range deleteMsgs {
		l0SegmentID := wb.getL0SegmentID(delMsg.GetPartitionID(), startPos)
		pks := storage.ParseIDs2PrimaryKeys(delMsg.GetPrimaryKeys())
		lcs := lo.Map(pks, func(pk storage.PrimaryKey, _ int) *storage.LocationsCache { return storage.NewLocationsCache(pk) })
		segments := wb.metaCache.GetSegmentsBy(metacache.WithPartitionID(delMsg.PartitionID),
			metacache.WithSegmentState(commonpb.SegmentState_Growing, commonpb.SegmentState_Flushing, commonpb.SegmentState_Flushed))
		for _, segment := range segments {
			if segment.CompactTo() != 0 {
				continue
			}
			var deletePks []storage.PrimaryKey
			var deleteTss []typeutil.Timestamp
			for idx, lc := range lcs {
				if segment.GetBloomFilterSet().PkExists(lc) {
					deletePks = append(deletePks, pks[idx])
					deleteTss = append(deleteTss, delMsg.GetTimestamps()[idx])
				}
			}
			if len(deletePks) > 0 {
				wb.bufferDelete(l0SegmentID, deletePks, deleteTss, startPos, endPos)
			}
		}

		for _, inData := range groups {
			if delMsg.GetPartitionID() == common.AllPartitionsID || delMsg.GetPartitionID() == inData.partitionID {
				var deletePks []storage.PrimaryKey
				var deleteTss []typeutil.Timestamp
				for idx, pk := range pks {
					ts := delMsg.GetTimestamps()[idx]
					if inData.pkExists(pk, ts) {
						deletePks = append(deletePks, pk)
						deleteTss = append(deleteTss, delMsg.GetTimestamps()[idx])
					}
				}
				if len(deletePks) > 0 {
					wb.bufferDelete(l0SegmentID, deletePks, deleteTss, startPos, endPos)
				}
			}
		}
	}
}

func (wb *l0WriteBuffer) BufferData(insertMsgs []*msgstream.InsertMsg, deleteMsgs []*msgstream.DeleteMsg, startPos, endPos *msgpb.MsgPosition) error {
	wb.mut.Lock()
	defer wb.mut.Unlock()

	groups, err := wb.prepareInsert(insertMsgs)
	if err != nil {
		return err
	}

	// buffer insert data and add segment if not exists
	for _, inData := range groups {
		err := wb.bufferInsert(inData, startPos, endPos)
		if err != nil {
			return err
		}
	}

	// distribute delete msg
	// bf write buffer check bloom filter of segment and current insert batch to decide which segment to write delete data
	wb.dispatchDeleteMsgs(groups, deleteMsgs, startPos, endPos)

	// update pk oracle
	for _, inData := range groups {
		// segment shall always exists after buffer insert
		segments := wb.metaCache.GetSegmentsBy(metacache.WithSegmentIDs(inData.segmentID))
		for _, segment := range segments {
			for _, fieldData := range inData.pkField {
				err := segment.GetBloomFilterSet().UpdatePKRange(fieldData)
				if err != nil {
					return err
				}
			}
		}
	}

	// update buffer last checkpoint
	wb.checkpoint = endPos

	segmentsSync := wb.triggerSync()
	for _, segment := range segmentsSync {
		partition, ok := wb.l0partition[segment]
		if ok {
			delete(wb.l0partition, segment)
			delete(wb.l0Segments, partition)
		}
	}

	wb.cleanupCompactedSegments()
	return nil
}

func (wb *l0WriteBuffer) getL0SegmentID(partitionID int64, startPos *msgpb.MsgPosition) int64 {
	log := wb.logger
	segmentID, ok := wb.l0Segments[partitionID]
	if !ok {
		err := retry.Do(context.Background(), func() error {
			var err error
			segmentID, err = wb.idAllocator.AllocOne()
			return err
		})
		if err != nil {
			log.Error("failed to allocate l0 segment ID", zap.Error(err))
			panic(err)
		}
		wb.l0Segments[partitionID] = segmentID
		wb.l0partition[segmentID] = partitionID
		wb.metaCache.AddSegment(&datapb.SegmentInfo{
			ID:            segmentID,
			PartitionID:   partitionID,
			CollectionID:  wb.collectionID,
			InsertChannel: wb.channelName,
			StartPosition: startPos,
			State:         commonpb.SegmentState_Growing,
			Level:         datapb.SegmentLevel_L0,
		}, func(_ *datapb.SegmentInfo) *metacache.BloomFilterSet { return metacache.NewBloomFilterSet() }, metacache.SetStartPosRecorded(false))
		log.Info("Add a new level zero segment",
			zap.Int64("segmentID", segmentID),
			zap.String("level", datapb.SegmentLevel_L0.String()),
			zap.Any("start position", startPos),
		)
	}
	return segmentID
}