separate goroutine to send ack to publisher

weed/mq/broker/broker_grpc_pub.go

@@ -11,6 +11,8 @@ import (
 	"io"
 	"math/rand"
 	"net"
+	"sync/atomic"
+	"time"
 )
 
 // PUB
@@ -45,7 +47,6 @@ func (b *MessageQueueBroker) PublishMessage(stream mq_pb.SeaweedMessaging_Publis
 	}
 	response := &mq_pb.PublishMessageResponse{}
 	// TODO check whether current broker should be the leader for the topic partition
-	ackInterval := 1
 	initMessage := req.GetInit()
 	if initMessage == nil {
 		response.Error = fmt.Sprintf("missing init message")
@@ -62,7 +63,6 @@ func (b *MessageQueueBroker) PublishMessage(stream mq_pb.SeaweedMessaging_Publis
 		return stream.Send(response)
 	}
 
-	ackInterval = int(initMessage.AckInterval)
 
 	// connect to follower brokers
 	if localTopicPartition.FollowerStream == nil && len(initMessage.FollowerBrokers) > 0 {
@@ -104,22 +104,49 @@ func (b *MessageQueueBroker) PublishMessage(stream mq_pb.SeaweedMessaging_Publis
 					glog.Errorf("Error receiving follower ack: %v", err)
 					return
 				}
+				atomic.StoreInt64(&localTopicPartition.AckTsNs, ack.AckTsNs)
 				println("recv ack", ack.AckTsNs)
-				if err := stream.Send(&mq_pb.PublishMessageResponse{
-					AckSequence: ack.AckTsNs,
-				}); err != nil {
-					glog.Errorf("Error sending publisher ack %v: %v", ack, err)
-					return
-				}
 			}
 		}()
 	}
 
+	var receivedSequence, acknowledgedSequence  int64
+	var isClosed bool
+
+	// start sending ack to publisher
+	ackInterval := int64(1)
+	if initMessage.AckInterval > 0 {
+		ackInterval = int64(initMessage.AckInterval)
+	}
+	go func() {
+		defer func() {
+			println("stop sending ack to publisher")
+		}()
+
+		lastAckTime := time.Now()
+		for !isClosed {
+			receivedSequence = atomic.LoadInt64(&localTopicPartition.AckTsNs)
+			if acknowledgedSequence < receivedSequence && (receivedSequence - acknowledgedSequence >= ackInterval || time.Since(lastAckTime) > 1*time.Second){
+				acknowledgedSequence = receivedSequence
+				response := &mq_pb.PublishMessageResponse{
+					AckSequence: acknowledgedSequence,
+				}
+				if err := stream.Send(response); err != nil {
+					glog.Errorf("Error sending response %v: %v", response, err)
+				}
+				println("sent ack", acknowledgedSequence)
+				lastAckTime = time.Now()
+			} else {
+				time.Sleep(1 * time.Second)
+			}
+		}
+	}()
+
+
 	// process each published messages
 	clientName := fmt.Sprintf("%v-%4d/%s/%v", findClientAddress(stream.Context()), rand.Intn(10000), initMessage.Topic, initMessage.Partition)
 	localTopicPartition.Publishers.AddPublisher(clientName, topic.NewLocalPublisher())
 
-	ackCounter := 0
 	var ackSequence int64
 	defer func() {
 		// remove the publisher
@@ -146,24 +173,8 @@ func (b *MessageQueueBroker) PublishMessage(stream mq_pb.SeaweedMessaging_Publis
 	// send a hello message
 	stream.Send(&mq_pb.PublishMessageResponse{})
 
-	var receivedSequence, acknowledgedSequence  int64
-
 	defer func() {
-		if localTopicPartition.FollowerStream != nil {
-			//if err := followerStream.CloseSend(); err != nil {
-			//	glog.Errorf("Error closing follower stream: %v", err)
-			//}
-		} else {
-			if acknowledgedSequence < receivedSequence {
-				acknowledgedSequence = receivedSequence
-				response := &mq_pb.PublishMessageResponse{
-					AckSequence: acknowledgedSequence,
-				}
-				if err := stream.Send(response); err != nil {
-					glog.Errorf("Error sending response %v: %v", response, err)
-				}
-			}
-		}
+		isClosed = true
 	}()
 
 	// process each published messages
@@ -175,7 +186,7 @@ func (b *MessageQueueBroker) PublishMessage(stream mq_pb.SeaweedMessaging_Publis
 				break
 			}
 			glog.V(0).Infof("topic %v partition %v publish stream error: %v", initMessage.Topic, initMessage.Partition, err)
-			return err
+			break
 		}
 
 		// Process the received message
@@ -199,37 +210,10 @@ func (b *MessageQueueBroker) PublishMessage(stream mq_pb.SeaweedMessaging_Publis
 				return followErr
 			}
 		} else {
-			ackCounter++
-			if ackCounter >= ackInterval {
-				ackCounter = 0
-				// send back the ack directly
-				acknowledgedSequence = receivedSequence
-				response := &mq_pb.PublishMessageResponse{
-					AckSequence: acknowledgedSequence,
-				}
-				if err := stream.Send(response); err != nil {
-					glog.Errorf("Error sending response %v: %v", response, err)
-				}
-			}
+			atomic.StoreInt64(&localTopicPartition.AckTsNs, receivedSequence)
 		}
 	}
 
-	if localTopicPartition.FollowerStream != nil {
-		// send close to the follower
-		if followErr := localTopicPartition.FollowerStream.Send(&mq_pb.PublishFollowMeRequest{
-			Message: &mq_pb.PublishFollowMeRequest_Close{
-				Close: &mq_pb.PublishFollowMeRequest_CloseMessage{},
-			},
-		}); followErr != nil {
-			return followErr
-		}
-		println("closing follower stream")
-
-		//if err := followerStream.CloseSend(); err != nil {
-		//	glog.Errorf("Error closing follower stream: %v", err)
-		//}
-	}
-
 	glog.V(0).Infof("topic %v partition %v publish stream closed.", initMessage.Topic, initMessage.Partition)
 
 	return nil