persist consumer group offset

1. use one follower
2. read write consumer group offset

weed/mq/broker/broker_grpc_assign.go

@@ -36,7 +36,7 @@ func (b *MessageQueueBroker) AssignTopicPartitions(c context.Context, request *m
 	// if is leader, notify the followers to drain existing topic partition subscriptions
 	if request.IsLeader {
 		for _, brokerPartition := range request.BrokerPartitionAssignments {
-			for _, follower := range brokerPartition.FollowerBrokers {
+			if follower := brokerPartition.FollowerBroker; follower != "" {
 				err := pb.WithBrokerGrpcClient(false, follower, b.grpcDialOption, func(client mq_pb.SeaweedMessagingClient) error {
 					_, err := client.AssignTopicPartitions(context.Background(), request)
 					return err

weed/mq/broker/broker_grpc_sub.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/mq/topic"
+	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
 	"github.com/seaweedfs/seaweedfs/weed/util/log_buffer"
@@ -51,12 +52,42 @@ func (b *MessageQueueBroker) SubscribeMessage(stream mq_pb.SeaweedMessaging_Subs
 		}
 	}()
 
-	var startPosition log_buffer.MessagePosition
-	if req.GetInit() != nil && req.GetInit().GetPartitionOffset() != nil {
-		startPosition = getRequestPosition(req.GetInit().GetPartitionOffset())
+	startPosition := b.getRequestPosition(req.GetInit())
+
+	// connect to the follower
+	var subscribeFollowMeStream mq_pb.SeaweedMessaging_SubscribeFollowMeClient
+	glog.V(0).Infof("follower broker: %v", req.GetInit().FollowerBroker)
+	if req.GetInit().FollowerBroker != "" {
+		follower := req.GetInit().FollowerBroker
+		if followerGrpcConnection, err := pb.GrpcDial(ctx, follower, true, b.grpcDialOption); err != nil {
+			return fmt.Errorf("fail to dial %s: %v", follower, err)
+		} else {
+			defer func() {
+				println("closing SubscribeFollowMe connection", follower)
+				followerGrpcConnection.Close()
+			}()
+			followerClient := mq_pb.NewSeaweedMessagingClient(followerGrpcConnection)
+			if subscribeFollowMeStream, err = followerClient.SubscribeFollowMe(ctx); err != nil {
+				return fmt.Errorf("fail to subscribe to %s: %v", follower, err)
+			} else {
+				if err := subscribeFollowMeStream.Send(&mq_pb.SubscribeFollowMeRequest{
+					Message: &mq_pb.SubscribeFollowMeRequest_Init{
+						Init: &mq_pb.SubscribeFollowMeRequest_InitMessage{
+							Topic:      req.GetInit().Topic,
+							Partition:  req.GetInit().GetPartitionOffset().Partition,
+							ConsumerGroup: req.GetInit().ConsumerGroup,
+						},
+					},
+				}); err != nil {
+					return fmt.Errorf("fail to send init to %s: %v", follower, err)
+				}
+			}
+		}
+		glog.V(0).Infof("follower %s connected", follower)
 	}
 
 	go func() {
+		var lastOffset int64
 		for {
 			ack, err := stream.Recv()
 			if err != nil {
@@ -66,7 +97,34 @@ func (b *MessageQueueBroker) SubscribeMessage(stream mq_pb.SeaweedMessaging_Subs
 				glog.V(0).Infof("topic %v partition %v subscriber %s error: %v", t, partition, clientName, err)
 				break
 			}
-			println(clientName, "ack =>", ack.GetAck().Sequence)
+			lastOffset = ack.GetAck().Sequence
+			if subscribeFollowMeStream != nil {
+				if err := subscribeFollowMeStream.Send(&mq_pb.SubscribeFollowMeRequest{
+					Message: &mq_pb.SubscribeFollowMeRequest_Ack{
+						Ack: &mq_pb.SubscribeFollowMeRequest_AckMessage{
+							TsNs: lastOffset,
+						},
+					},
+				}); err != nil {
+					glog.Errorf("Error sending ack to follower: %v", err)
+					break
+				}
+				println("forwarding ack", lastOffset)
+			}
+		}
+		if lastOffset > 0 {
+			if err := b.saveConsumerGroupOffset(t, partition, req.GetInit().ConsumerGroup, lastOffset); err != nil {
+				glog.Errorf("saveConsumerGroupOffset: %v", err)
+			}
+			if subscribeFollowMeStream != nil {
+				if err := subscribeFollowMeStream.Send(&mq_pb.SubscribeFollowMeRequest{
+					Message: &mq_pb.SubscribeFollowMeRequest_Close{
+						Close: &mq_pb.SubscribeFollowMeRequest_CloseMessage{},
+					},
+				}); err != nil {
+					glog.Errorf("Error sending close to follower: %v", err)
+				}
+			}
 		}
 	}()
 
@@ -115,10 +173,20 @@ func (b *MessageQueueBroker) SubscribeMessage(stream mq_pb.SeaweedMessaging_Subs
 	})
 }
 
-func getRequestPosition(offset *mq_pb.PartitionOffset) (startPosition log_buffer.MessagePosition) {
+func (b *MessageQueueBroker) getRequestPosition(initMessage *mq_pb.SubscribeMessageRequest_InitMessage) (startPosition log_buffer.MessagePosition) {
+	if initMessage == nil {
+		return
+	}
+	offset := initMessage.GetPartitionOffset()
 	if offset.StartTsNs != 0 {
 		startPosition = log_buffer.NewMessagePosition(offset.StartTsNs, -2)
+		return
 	}
+	if storedOffset, err := b.readConsumerGroupOffset(initMessage); err == nil{
+		startPosition = log_buffer.NewMessagePosition(storedOffset, -2)
+		return
+	}
+
 	if offset.StartType == mq_pb.PartitionOffsetStartType_EARLIEST {
 		startPosition = log_buffer.NewMessagePosition(1, -3)
 	} else if offset.StartType == mq_pb.PartitionOffsetStartType_LATEST {

weed/mq/broker/broker_grpc_sub_follow.go

@@ -25,11 +25,7 @@ func (b *MessageQueueBroker) SubscribeFollowMe(stream mq_pb.SeaweedMessaging_Sub
 	}
 
 	// create an in-memory offset
-	subscriberProgress := &SubscriberProgress{
-		Topic: topic.FromPbTopic(initMessage.Topic),
-		Partition: topic.FromPbPartition(initMessage.Partition),
-		ConsumerGroup: "consumer_group",
-	}
+	var lastOffset int64
 
 	// follow each published messages
 	for {
@@ -46,8 +42,8 @@ func (b *MessageQueueBroker) SubscribeFollowMe(stream mq_pb.SeaweedMessaging_Sub
 
 		// Process the received message
 		if ackMessage := req.GetAck(); ackMessage != nil {
-			subscriberProgress.Offset = ackMessage.TsNs
-			println("offset", subscriberProgress.Offset)
+			lastOffset = ackMessage.TsNs
+			println("offset", lastOffset)
 		} else if closeMessage := req.GetClose(); closeMessage != nil {
 			glog.V(0).Infof("topic %v partition %v subscribe stream closed: %v", initMessage.Topic, initMessage.Partition, closeMessage)
 			return nil
@@ -58,19 +54,47 @@ func (b *MessageQueueBroker) SubscribeFollowMe(stream mq_pb.SeaweedMessaging_Sub
 
 	t, p := topic.FromPbTopic(initMessage.Topic), topic.FromPbPartition(initMessage.Partition)
 
+	err = b.saveConsumerGroupOffset(t, p, initMessage.ConsumerGroup, lastOffset)
+
+	glog.V(0).Infof("shut down follower for %v", initMessage)
+
+	return err
+}
+
+func (b *MessageQueueBroker) readConsumerGroupOffset(initMessage *mq_pb.SubscribeMessageRequest_InitMessage) (offset int64, err error) {
+	t, p := topic.FromPbTopic(initMessage.Topic), topic.FromPbPartition(initMessage.PartitionOffset.Partition)
+
 	topicDir := fmt.Sprintf("%s/%s/%s", filer.TopicsDir, t.Namespace, t.Name)
 	partitionGeneration := time.Unix(0, p.UnixTimeNs).UTC().Format(topic.TIME_FORMAT)
 	partitionDir := fmt.Sprintf("%s/%s/%04d-%04d", topicDir, partitionGeneration, p.RangeStart, p.RangeStop)
-	offsetFileName := fmt.Sprintf("%s.offset", subscriberProgress.ConsumerGroup)
-
-	offsetBytes := make([]byte, 8)
-	util.Uint64toBytes(offsetBytes, uint64(subscriberProgress.Offset))
+	offsetFileName := fmt.Sprintf("%s.offset", initMessage.ConsumerGroup)
 
 	err = b.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
-		return filer.SaveInsideFiler(client, partitionDir, offsetFileName, offsetBytes)
+		data, err := filer.ReadInsideFiler(client, partitionDir, offsetFileName)
+		if err != nil {
+				return err
+		}
+		if len(data) != 8 {
+			return fmt.Errorf("no offset found")
+		}
+		offset = int64(util.BytesToUint64(data))
+		return nil
 	})
+	return offset, err
+}
 
-	glog.V(0).Infof("shut down follower for %v %v", t, p)
+func (b *MessageQueueBroker) saveConsumerGroupOffset(t topic.Topic, p topic.Partition, consumerGroup string, offset int64) error {
 
-	return err
+	topicDir := fmt.Sprintf("%s/%s/%s", filer.TopicsDir, t.Namespace, t.Name)
+	partitionGeneration := time.Unix(0, p.UnixTimeNs).UTC().Format(topic.TIME_FORMAT)
+	partitionDir := fmt.Sprintf("%s/%s/%04d-%04d", topicDir, partitionGeneration, p.RangeStart, p.RangeStop)
+	offsetFileName := fmt.Sprintf("%s.offset", consumerGroup)
+
+	offsetBytes := make([]byte, 8)
+	util.Uint64toBytes(offsetBytes, uint64(offset))
+
+	return b.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
+		glog.V(0).Infof("saving topic %s partition %v consumer group %s offset %d", t, p, consumerGroup, offset)
+		return filer.SaveInsideFiler(client, partitionDir, offsetFileName, offsetBytes)
+	})
 }

weed/mq/broker/broker_topic_partition_read_write.go

@@ -103,7 +103,7 @@ func (b *MessageQueueBroker) genLogOnDiskReadFunc(t topic.Topic, partition *mq_p
 
 	eachFileFn := func(entry *filer_pb.Entry, eachLogEntryFn log_buffer.EachLogEntryFuncType, starTsNs, stopTsNs int64) (processedTsNs int64, err error) {
 		if len(entry.Content) > 0 {
-			glog.Warningf("this should not happen. unexpected content in %s/%s", partitionDir, entry.Name)
+			// skip .offset files
 			return
 		}
 		var urlStrings []string

weed/mq/broker/subscriber_progress.go

@@ -1,10 +0,0 @@
-package broker
-
-import "github.com/seaweedfs/seaweedfs/weed/mq/topic"
-
-type SubscriberProgress struct {
-	topic.Topic
-	topic.Partition
-	ConsumerGroup string
-	Offset int64
-}

weed/mq/client/pub_client/scheduler.go

@@ -145,7 +145,7 @@ func (p *TopicPublisher) doPublishToPartition(job *EachPartitionPublishJob) erro
 				Topic:           p.config.Topic.ToPbTopic(),
 				Partition:       job.Partition,
 				AckInterval:     128,
-				FollowerBrokers: job.FollowerBrokers,
+				FollowerBroker:  job.FollowerBroker,
 				PublisherName:   p.config.PublisherName,
 			},
 		},

weed/mq/client/sub_client/connect_to_sub_coordinator.go

@@ -102,11 +102,10 @@ func (sub *TopicSubscriber) onEachPartition(assigned *mq_pb.BrokerPartitionAssig
 					Topic:         sub.ContentConfig.Topic.ToPbTopic(),
 					PartitionOffset: &mq_pb.PartitionOffset{
 						Partition: assigned.Partition,
-						StartTsNs: sub.alreadyProcessedTsNs,
 						StartType: mq_pb.PartitionOffsetStartType_EARLIEST_IN_MEMORY,
 					},
 					Filter: sub.ContentConfig.Filter,
-					FollowerBrokers: assigned.FollowerBrokers,
+					FollowerBroker: assigned.FollowerBroker,
 				},
 			},
 		});err != nil {
@@ -154,7 +153,6 @@ func (sub *TopicSubscriber) onEachPartition(assigned *mq_pb.BrokerPartitionAssig
 				if processErr != nil {
 					return fmt.Errorf("process error: %v", processErr)
 				}
-				sub.alreadyProcessedTsNs = m.Data.TsNs
 				partitionOffsetChan <- m.Data.TsNs
 				if !shouldContinue {
 					return nil

weed/mq/client/sub_client/subscriber.go

@@ -37,7 +37,6 @@ type TopicSubscriber struct {
 	OnCompletionFunc           OnCompletionFunc
 	bootstrapBrokers           []string
 	waitForMoreMessage         bool
-	alreadyProcessedTsNs       int64
 	activeProcessors           map[topic.Partition]*ProcessorState
 	activeProcessorsLock       sync.Mutex
 }
@@ -50,7 +49,6 @@ func NewTopicSubscriber(bootstrapBrokers []string, subscriber *SubscriberConfigu
 		brokerPartitionAssignmentChan: make(chan *mq_pb.BrokerPartitionAssignment, 1024),
 		bootstrapBrokers:              bootstrapBrokers,
 		waitForMoreMessage:            true,
-		alreadyProcessedTsNs:          content.StartTime.UnixNano(),
 		activeProcessors:              make(map[topic.Partition]*ProcessorState),
 	}
 }

weed/mq/pub_balancer/allocate.go

@@ -48,20 +48,11 @@ func pickBrokers(brokers cmap.ConcurrentMap[string, *BrokerStats], count int32)
 	return pickedBrokers
 }
 
-// reservoir sampling select N brokers from the active brokers, with exclusion of the excluded brokers
-func pickBrokersExcluded(brokers []string, count int, excludedLeadBroker string, excludedBrokers []string) []string {
-	// convert the excluded brokers to a map
-	excludedBrokerMap := make(map[string]bool)
-	for _, broker := range excludedBrokers {
-		excludedBrokerMap[broker] = true
-	}
-	if excludedLeadBroker != "" {
-		excludedBrokerMap[excludedLeadBroker] = true
-	}
-
+// reservoir sampling select N brokers from the active brokers, with exclusion of the excluded broker
+func pickBrokersExcluded(brokers []string, count int, excludedLeadBroker string, excludedBroker string) []string {
 	pickedBrokers := make([]string, 0, count)
 	for i, broker := range brokers {
-		if _, found := excludedBrokerMap[broker]; found {
+		if broker == excludedBroker {
 			continue
 		}
 		if len(pickedBrokers) < count {
@@ -102,21 +93,15 @@ func EnsureAssignmentsToActiveBrokers(activeBrokers cmap.ConcurrentMap[string, *
 			assignment.LeaderBroker = ""
 			count++
 		}
-		for i := 0; i < followerCount; i++ {
-			if i >= len(assignment.FollowerBrokers) {
-				count++
-				continue
-			}
-			if assignment.FollowerBrokers[i] == "" {
+		if assignment.FollowerBroker == "" {
 			count++
-			} else if _, found := activeBrokers.Get(assignment.FollowerBrokers[i]); !found {
-				assignment.FollowerBrokers[i] = ""
+		} else if _, found := activeBrokers.Get(assignment.FollowerBroker); !found {
+			assignment.FollowerBroker = ""
 			count++
 		}
-		}
 
 		if count > 0 {
-			pickedBrokers := pickBrokersExcluded(candidates, count, assignment.LeaderBroker, assignment.FollowerBrokers)
+			pickedBrokers := pickBrokersExcluded(candidates, count, assignment.LeaderBroker, assignment.FollowerBroker)
 			i := 0
 			if assignment.LeaderBroker == "" {
 				if i < len(pickedBrokers) {
@@ -125,35 +110,14 @@ func EnsureAssignmentsToActiveBrokers(activeBrokers cmap.ConcurrentMap[string, *
 					hasChanges = true
 				}
 			}
-
-			hasEmptyFollowers := false
-			j := 0
-			for ; j < len(assignment.FollowerBrokers); j++ {
-				if assignment.FollowerBrokers[j] == "" {
-					hasChanges = true
+			if assignment.FollowerBroker == "" {
 				if i < len(pickedBrokers) {
-						assignment.FollowerBrokers[j] = pickedBrokers[i]
+					assignment.FollowerBroker = pickedBrokers[i]
 					i++
-					} else {
-						hasEmptyFollowers = true
-					}
-				}
-			}
-			if hasEmptyFollowers {
-				var followerBrokers []string
-				for _, follower := range assignment.FollowerBrokers {
-					if follower != "" {
-						followerBrokers = append(followerBrokers, follower)
-					}
-				}
-				assignment.FollowerBrokers = followerBrokers
-			}
-
-			if i < len(pickedBrokers) {
-				assignment.FollowerBrokers = append(assignment.FollowerBrokers, pickedBrokers[i:]...)
 					hasChanges = true
 				}
 			}
+		}
 
 	}
 

weed/mq/pub_balancer/balancer.go

@@ -92,7 +92,7 @@ func (balancer *Balancer) OnBrokerStatsUpdated(broker string, brokerStats *Broke
 				partitionSlotToBrokerList, _ = balancer.TopicToBrokers.Get(topicKey)
 			}
 		}
-		partitionSlotToBrokerList.AddBroker(partition, broker)
+		partitionSlotToBrokerList.AddBroker(partition, broker, topicPartitionStats.Follower)
 	}
 }
 

weed/mq/pub_balancer/partition_list_broker.go

@@ -10,6 +10,7 @@ type PartitionSlotToBroker struct {
 	RangeStop      int32
 	UnixTimeNs     int64
 	AssignedBroker string
+	FollowerBroker string
 }
 
 type PartitionSlotToBrokerList struct {
@@ -23,16 +24,18 @@ func NewPartitionSlotToBrokerList(ringSize int32) *PartitionSlotToBrokerList {
 	}
 }
 
-func (ps *PartitionSlotToBrokerList) AddBroker(partition *mq_pb.Partition, broker string) {
+func (ps *PartitionSlotToBrokerList) AddBroker(partition *mq_pb.Partition, broker string, follower string) {
 	for _, partitionSlot := range ps.PartitionSlots {
 		if partitionSlot.RangeStart == partition.RangeStart && partitionSlot.RangeStop == partition.RangeStop {
-			if partitionSlot.AssignedBroker == broker {
-				return
-			}
-			if partitionSlot.AssignedBroker != "" {
+			if partitionSlot.AssignedBroker != "" && partitionSlot.AssignedBroker != broker {
 				glog.V(0).Infof("partition %s broker change: %s => %s", partition, partitionSlot.AssignedBroker, broker)
-			}
 				partitionSlot.AssignedBroker = broker
+			}
+			if partitionSlot.FollowerBroker != "" && partitionSlot.FollowerBroker != follower {
+				glog.V(0).Infof("partition %s follower change: %s => %s", partition, partitionSlot.FollowerBroker, follower)
+				partitionSlot.FollowerBroker = follower
+			}
+
 			return
 		}
 	}
@@ -41,6 +44,7 @@ func (ps *PartitionSlotToBrokerList) AddBroker(partition *mq_pb.Partition, broke
 		RangeStop:      partition.RangeStop,
 		UnixTimeNs:     partition.UnixTimeNs,
 		AssignedBroker: broker,
+		FollowerBroker: follower,
 	})
 }
 func (ps *PartitionSlotToBrokerList) RemoveBroker(broker string) {

weed/mq/sub_coordinator/consumer_group.go

@@ -66,7 +66,7 @@ func (cg *ConsumerGroup) OnPartitionListChange(assignments []*mq_pb.BrokerPartit
 	}
 	partitionSlotToBrokerList := pub_balancer.NewPartitionSlotToBrokerList(pub_balancer.MaxPartitionCount)
 	for _, assignment := range assignments {
-		partitionSlotToBrokerList.AddBroker(assignment.Partition, assignment.LeaderBroker)
+		partitionSlotToBrokerList.AddBroker(assignment.Partition, assignment.LeaderBroker, assignment.FollowerBroker)
 	}
 	cg.BalanceConsumerGroupInstances(partitionSlotToBrokerList, "partition list change")
 }
@@ -80,7 +80,7 @@ func (cg *ConsumerGroup) BalanceConsumerGroupInstances(knownPartitionSlotToBroke
 		if conf, err := cg.filerClientAccessor.ReadTopicConfFromFiler(cg.topic); err == nil {
 			partitionSlotToBrokerList = pub_balancer.NewPartitionSlotToBrokerList(pub_balancer.MaxPartitionCount)
 			for _, assignment := range conf.BrokerPartitionAssignments {
-				partitionSlotToBrokerList.AddBroker(assignment.Partition, assignment.LeaderBroker)
+				partitionSlotToBrokerList.AddBroker(assignment.Partition, assignment.LeaderBroker, assignment.FollowerBroker)
 			}
 		} else {
 			glog.V(0).Infof("fail to read topic conf from filer: %v", err)
@@ -119,6 +119,7 @@ func (cg *ConsumerGroup) BalanceConsumerGroupInstances(knownPartitionSlotToBroke
 					UnixTimeNs: partitionSlot.UnixTimeNs,
 				},
 				LeaderBroker:   partitionSlot.Broker,
+				FollowerBroker: partitionSlot.FollowerBroker,
 			}
 		}
 		response := &mq_pb.SubscriberToSubCoordinatorResponse{

weed/mq/sub_coordinator/partition_consumer_mapping.go

@@ -86,6 +86,7 @@ func doBalanceSticky(partitions []*pub_balancer.PartitionSlotToBroker, consumerI
 			RangeStop:  partition.RangeStop,
 			UnixTimeNs: partition.UnixTimeNs,
 			Broker:     partition.AssignedBroker,
+			FollowerBroker: partition.FollowerBroker,
 		})
 	}
 	for _, newPartitionSlot := range newPartitionSlots {

weed/mq/sub_coordinator/partition_list.go

@@ -8,6 +8,7 @@ type PartitionSlotToConsumerInstance struct {
 	UnixTimeNs         int64
 	Broker             string
 	AssignedInstanceId string
+	FollowerBroker     string
 }
 
 type PartitionSlotToConsumerInstanceList struct {

weed/mq/topic/local_manager.go

@@ -99,6 +99,7 @@ func (manager *LocalTopicManager) CollectStats(duration time.Duration) *mq_pb.Br
 				Partition:       localPartition.Partition.ToPbPartition(),
 				PublisherCount:  int32(localPartition.Publishers.Size()),
 				SubscriberCount: int32(localPartition.Subscribers.Size()),
+				Follower:        localPartition.Follower,
 			}
 			// fmt.Printf("collect topic %+v partition %+v\n", topicPartition, localPartition.Partition)
 		}

weed/mq/topic/local_partition.go

@@ -30,7 +30,7 @@ type LocalPartition struct {
 
 	publishFolloweMeStream mq_pb.SeaweedMessaging_PublishFollowMeClient
 	followerGrpcConnection *grpc.ClientConn
-	follower               string
+	Follower               string
 }
 
 var TIME_FORMAT = "2006-01-02-15-04-05"
@@ -62,7 +62,7 @@ func (p *LocalPartition) Publish(message *mq_pb.DataMessage) error {
 				Data: message,
 			},
 		}); followErr != nil {
-			return fmt.Errorf("send to follower %s: %v", p.follower, followErr)
+			return fmt.Errorf("send to follower %s: %v", p.Follower, followErr)
 		}
 	} else {
 		atomic.StoreInt64(&p.AckTsNs, message.TsNs)
@@ -137,15 +137,15 @@ func (p *LocalPartition) MaybeConnectToFollowers(initMessage *mq_pb.PublishMessa
 	if p.publishFolloweMeStream != nil {
 		return nil
 	}
-	if len(initMessage.FollowerBrokers) == 0 {
+	if initMessage.FollowerBroker == "" {
 		return nil
 	}
 
-	p.follower = initMessage.FollowerBrokers[0]
+	p.Follower = initMessage.FollowerBroker
 	ctx := context.Background()
-	p.followerGrpcConnection, err = pb.GrpcDial(ctx, p.follower, true, grpcDialOption)
+	p.followerGrpcConnection, err = pb.GrpcDial(ctx, p.Follower, true, grpcDialOption)
 	if err != nil {
-		return fmt.Errorf("fail to dial %s: %v", p.follower, err)
+		return fmt.Errorf("fail to dial %s: %v", p.Follower, err)
 	}
 	followerClient := mq_pb.NewSeaweedMessagingClient(p.followerGrpcConnection)
 	p.publishFolloweMeStream, err = followerClient.PublishFollowMe(ctx)
@@ -174,10 +174,10 @@ func (p *LocalPartition) MaybeConnectToFollowers(initMessage *mq_pb.PublishMessa
 			if err != nil {
 				e, _ := status.FromError(err)
 				if e.Code() == codes.Canceled {
-					glog.V(0).Infof("local partition %v follower %v stopped", p.Partition, p.follower)
+					glog.V(0).Infof("local partition %v follower %v stopped", p.Partition, p.Follower)
 					return
 				}
-				glog.Errorf("Receiving local partition %v  follower %s ack: %v", p.Partition, p.follower, err)
+				glog.Errorf("Receiving local partition %v  follower %s ack: %v", p.Partition, p.Follower, err)
 				return
 			}
 			atomic.StoreInt64(&p.AckTsNs, ack.AckTsNs)
@@ -206,13 +206,13 @@ func (p *LocalPartition) MaybeShutdownLocalPartition() (hasShutdown bool) {
 			glog.V(4).Infof("closing grpcConnection to follower")
 			p.followerGrpcConnection.Close()
 			p.publishFolloweMeStream = nil
-			p.follower = ""
+			p.Follower = ""
 		}
 
 		hasShutdown = true
 	}
 
-	glog.V(0).Infof("local partition %v Publisher:%d Subscriber:%d follower:%s shutdown %v", p.Partition, p.Publishers.Size(), p.Subscribers.Size(), p.follower, hasShutdown)
+	glog.V(0).Infof("local partition %v Publisher:%d Subscriber:%d follower:%s shutdown %v", p.Partition, p.Publishers.Size(), p.Subscribers.Size(), p.Follower, hasShutdown)
 	return
 }
 
@@ -232,8 +232,8 @@ func (p *LocalPartition) NotifyLogFlushed(flushTsNs int64) {
 				},
 			},
 		}); followErr != nil {
-			glog.Errorf("send follower %s flush message: %v", p.follower, followErr)
+			glog.Errorf("send follower %s flush message: %v", p.Follower, followErr)
 		}
-		// println("notifying", p.follower, "flushed at", flushTsNs)
+		// println("notifying", p.Follower, "flushed at", flushTsNs)
 	}
 }

weed/pb/mq.proto

@@ -103,6 +103,7 @@ message TopicPartitionStats {
     Partition partition = 2;
     int32 publisher_count = 3;
     int32 subscriber_count = 4;
+    string follower = 5;
 }
 
 
@@ -148,7 +149,7 @@ message LookupTopicBrokersResponse {
 message BrokerPartitionAssignment {
     Partition partition = 1;
     string leader_broker = 2;
-    repeated string follower_brokers = 3;
+    string follower_broker = 3;
 }
 
 message AssignTopicPartitionsRequest {
@@ -201,7 +202,7 @@ message PublishMessageRequest {
         Topic topic = 1;
         Partition partition = 2;
         int32 ack_interval = 3;
-        repeated string follower_brokers = 4;
+        string follower_broker = 4;
         string publisher_name = 5; // for debugging
     }
     oneof message {
@@ -243,7 +244,7 @@ message SubscribeMessageRequest {
         Topic topic = 4;
         PartitionOffset partition_offset = 5;
         string filter = 6;
-        repeated string follower_brokers = 7;
+        string follower_broker = 7;
     }
     message AckMessage {
         int64 sequence = 1;
@@ -268,6 +269,7 @@ message SubscribeFollowMeRequest {
     message InitMessage {
         Topic topic = 1;
         Partition partition = 2;
+        string consumer_group = 3;
     }
     message AckMessage {
         int64 ts_ns = 1;

weed/pb/mq_pb/mq.pb.go

@@ -481,6 +481,7 @@ type TopicPartitionStats struct {
 	Partition       *Partition `protobuf:"bytes,2,opt,name=partition,proto3" json:"partition,omitempty"`
 	PublisherCount  int32      `protobuf:"varint,3,opt,name=publisher_count,json=publisherCount,proto3" json:"publisher_count,omitempty"`
 	SubscriberCount int32      `protobuf:"varint,4,opt,name=subscriber_count,json=subscriberCount,proto3" json:"subscriber_count,omitempty"`
+	Follower        string     `protobuf:"bytes,5,opt,name=follower,proto3" json:"follower,omitempty"`
 }
 
 func (x *TopicPartitionStats) Reset() {
@@ -543,6 +544,13 @@ func (x *TopicPartitionStats) GetSubscriberCount() int32 {
 	return 0
 }
 
+func (x *TopicPartitionStats) GetFollower() string {
+	if x != nil {
+		return x.Follower
+	}
+	return ""
+}
+
 type PublisherToPubBalancerRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1051,7 +1059,7 @@ type BrokerPartitionAssignment struct {
 
 	Partition      *Partition `protobuf:"bytes,1,opt,name=partition,proto3" json:"partition,omitempty"`
 	LeaderBroker   string     `protobuf:"bytes,2,opt,name=leader_broker,json=leaderBroker,proto3" json:"leader_broker,omitempty"`
-	FollowerBrokers []string   `protobuf:"bytes,3,rep,name=follower_brokers,json=followerBrokers,proto3" json:"follower_brokers,omitempty"`
+	FollowerBroker string     `protobuf:"bytes,3,opt,name=follower_broker,json=followerBroker,proto3" json:"follower_broker,omitempty"`
 }
 
 func (x *BrokerPartitionAssignment) Reset() {
@@ -1100,11 +1108,11 @@ func (x *BrokerPartitionAssignment) GetLeaderBroker() string {
 	return ""
 }
 
-func (x *BrokerPartitionAssignment) GetFollowerBrokers() []string {
+func (x *BrokerPartitionAssignment) GetFollowerBroker() string {
 	if x != nil {
-		return x.FollowerBrokers
+		return x.FollowerBroker
 	}
-	return nil
+	return ""
 }
 
 type AssignTopicPartitionsRequest struct {
@@ -2518,7 +2526,7 @@ type PublishMessageRequest_InitMessage struct {
 	Topic          *Topic     `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
 	Partition      *Partition `protobuf:"bytes,2,opt,name=partition,proto3" json:"partition,omitempty"`
 	AckInterval    int32      `protobuf:"varint,3,opt,name=ack_interval,json=ackInterval,proto3" json:"ack_interval,omitempty"`
-	FollowerBrokers []string   `protobuf:"bytes,4,rep,name=follower_brokers,json=followerBrokers,proto3" json:"follower_brokers,omitempty"`
+	FollowerBroker string     `protobuf:"bytes,4,opt,name=follower_broker,json=followerBroker,proto3" json:"follower_broker,omitempty"`
 	PublisherName  string     `protobuf:"bytes,5,opt,name=publisher_name,json=publisherName,proto3" json:"publisher_name,omitempty"` // for debugging
 }
 
@@ -2575,11 +2583,11 @@ func (x *PublishMessageRequest_InitMessage) GetAckInterval() int32 {
 	return 0
 }
 
-func (x *PublishMessageRequest_InitMessage) GetFollowerBrokers() []string {
+func (x *PublishMessageRequest_InitMessage) GetFollowerBroker() string {
 	if x != nil {
-		return x.FollowerBrokers
+		return x.FollowerBroker
 	}
-	return nil
+	return ""
 }
 
 func (x *PublishMessageRequest_InitMessage) GetPublisherName() string {
@@ -2740,7 +2748,7 @@ type SubscribeMessageRequest_InitMessage struct {
 	Topic           *Topic           `protobuf:"bytes,4,opt,name=topic,proto3" json:"topic,omitempty"`
 	PartitionOffset *PartitionOffset `protobuf:"bytes,5,opt,name=partition_offset,json=partitionOffset,proto3" json:"partition_offset,omitempty"`
 	Filter          string           `protobuf:"bytes,6,opt,name=filter,proto3" json:"filter,omitempty"`
-	FollowerBrokers []string         `protobuf:"bytes,7,rep,name=follower_brokers,json=followerBrokers,proto3" json:"follower_brokers,omitempty"`
+	FollowerBroker  string           `protobuf:"bytes,7,opt,name=follower_broker,json=followerBroker,proto3" json:"follower_broker,omitempty"`
 }
 
 func (x *SubscribeMessageRequest_InitMessage) Reset() {
@@ -2817,11 +2825,11 @@ func (x *SubscribeMessageRequest_InitMessage) GetFilter() string {
 	return ""
 }
 
-func (x *SubscribeMessageRequest_InitMessage) GetFollowerBrokers() []string {
+func (x *SubscribeMessageRequest_InitMessage) GetFollowerBroker() string {
 	if x != nil {
-		return x.FollowerBrokers
+		return x.FollowerBroker
 	}
-	return nil
+	return ""
 }
 
 type SubscribeMessageRequest_AckMessage struct {
@@ -2941,6 +2949,7 @@ type SubscribeFollowMeRequest_InitMessage struct {
 
 	Topic         *Topic     `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
 	Partition     *Partition `protobuf:"bytes,2,opt,name=partition,proto3" json:"partition,omitempty"`
+	ConsumerGroup string     `protobuf:"bytes,3,opt,name=consumer_group,json=consumerGroup,proto3" json:"consumer_group,omitempty"`
 }
 
 func (x *SubscribeFollowMeRequest_InitMessage) Reset() {
@@ -2989,6 +2998,13 @@ func (x *SubscribeFollowMeRequest_InitMessage) GetPartition() *Partition {
 	return nil
 }
 
+func (x *SubscribeFollowMeRequest_InitMessage) GetConsumerGroup() string {
+	if x != nil {
+		return x.ConsumerGroup
+	}
+	return ""
+}
+
 type SubscribeFollowMeRequest_AckMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3133,7 +3149,7 @@ var file_mq_proto_rawDesc = []byte{
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@@ -3146,81 +3162,61 @@ var file_mq_proto_rawDesc = []byte{
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 var (