subscriber receives partitions and dispatch to processors

weed/mq/client/sub_client/connect_to_sub_coordinator.go

@@ -7,7 +7,6 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
 	"io"
-	"sync"
 	"time"
 )
 
@@ -69,8 +68,10 @@ func (sub *TopicSubscriber) doKeepConnectedToSubCoordinator() {
 					assignment := resp.GetAssignment()
 					if assignment != nil {
 						glog.V(0).Infof("subscriber %s receive assignment: %v", sub.ContentConfig.Topic, assignment)
+						for _, assignedPartition := range assignment.PartitionAssignments {
+							sub.brokerPartitionAssignmentChan <- assignedPartition
+						}
 					}
-					sub.onEachAssignment(assignment)
 				}
 
 				return nil
@@ -84,31 +85,6 @@ func (sub *TopicSubscriber) doKeepConnectedToSubCoordinator() {
 	}
 }
 
-func (sub *TopicSubscriber) onEachAssignment(assignment *mq_pb.SubscriberToSubCoordinatorResponse_Assignment) {
-	if assignment == nil {
-		return
-	}
-	// process each partition, with a concurrency limit
-	var wg sync.WaitGroup
-	semaphore := make(chan struct{}, sub.ProcessorConfig.ConcurrentPartitionLimit)
-
-	for _, assigned := range assignment.PartitionAssignments {
-		wg.Add(1)
-		semaphore <- struct{}{}
-		go func(assigned *mq_pb.BrokerPartitionAssignment) {
-			defer wg.Done()
-			defer func() { <-semaphore }()
-			glog.V(0).Infof("subscriber %s/%s assigned partition %+v at %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker)
-			err := sub.onEachPartition(assigned)
-			if err != nil {
-				glog.V(0).Infof("subscriber %s/%s partition %+v at %v: %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker, err)
-			}
-		}(assigned)
-	}
-
-	wg.Wait()
-}
-
 func (sub *TopicSubscriber) onEachPartition(assigned *mq_pb.BrokerPartitionAssignment) error {
 	// connect to the partition broker
 	return pb.WithBrokerGrpcClient(true, assigned.LeaderBroker, sub.SubscriberConfig.GrpcDialOption, func(client mq_pb.SeaweedMessagingClient) error {

weed/mq/client/sub_client/subscribe.go

@@ -1,11 +1,88 @@
 package sub_client
 
+import (
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/mq/topic"
+	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
+	"sync"
+	"time"
+)
+
+type ProcessorState struct {
+
+}
+
 // Subscribe subscribes to a topic's specified partitions.
 // If a partition is moved to another broker, the subscriber will automatically reconnect to the new broker.
 
 func (sub *TopicSubscriber) Subscribe() error {
+
+	go sub.startProcessors()
+
 	// loop forever
 	sub.doKeepConnectedToSubCoordinator()
 
 	return nil
 }
+
+func (sub *TopicSubscriber) startProcessors() {
+	// listen to the messages from the sub coordinator
+	// start one processor per partition
+	var wg sync.WaitGroup
+	semaphore := make(chan struct{}, sub.ProcessorConfig.ConcurrentPartitionLimit)
+
+	for assigned := range sub.brokerPartitionAssignmentChan {
+		wg.Add(1)
+		semaphore <- struct{}{}
+
+		topicPartition := topic.FromPbPartition(assigned.Partition)
+
+		// wait until no covering partition is still in progress
+		sub.waitUntilNoOverlappingPartitionInFlight(topicPartition)
+
+		// start a processors
+		sub.activeProcessorsLock.Lock()
+		sub.activeProcessors[topicPartition] = &ProcessorState{}
+		sub.activeProcessorsLock.Unlock()
+
+		go func(assigned *mq_pb.BrokerPartitionAssignment, topicPartition topic.Partition) {
+			defer func() {
+				sub.activeProcessorsLock.Lock()
+				delete(sub.activeProcessors, topicPartition)
+				sub.activeProcessorsLock.Unlock()
+
+				<-semaphore
+				wg.Done()
+			}()
+			glog.V(0).Infof("subscriber %s/%s assigned partition %+v at %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker)
+			err := sub.onEachPartition(assigned)
+			if err != nil {
+				glog.V(0).Infof("subscriber %s/%s partition %+v at %v: %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker, err)
+			} else {
+				glog.V(0).Infof("subscriber %s/%s partition %+v at %v completed", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker)
+			}
+		}(assigned, topicPartition)
+	}
+
+	wg.Wait()
+
+}
+
+func (sub *TopicSubscriber) waitUntilNoOverlappingPartitionInFlight(topicPartition topic.Partition) {
+	foundOverlapping := true
+	for foundOverlapping {
+		sub.activeProcessorsLock.Lock()
+		foundOverlapping = false
+		for partition, _ := range sub.activeProcessors {
+			if partition.Overlaps(topicPartition) {
+				foundOverlapping = true
+				break
+			}
+		}
+		sub.activeProcessorsLock.Unlock()
+		if foundOverlapping {
+			glog.V(0).Infof("subscriber %s/%s waiting for partition %+v to complete", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, topicPartition)
+			time.Sleep(1 * time.Second)
+		}
+	}
+}

weed/mq/client/sub_client/subscriber.go

@@ -4,6 +4,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/mq/topic"
 	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
 	"google.golang.org/grpc"
+	"sync"
 	"time"
 )
 
@@ -31,12 +32,14 @@ type TopicSubscriber struct {
 	SubscriberConfig           *SubscriberConfiguration
 	ContentConfig              *ContentConfiguration
 	ProcessorConfig               *ProcessorConfiguration
-	brokerPartitionAssignments []*mq_pb.BrokerPartitionAssignment
+	brokerPartitionAssignmentChan chan *mq_pb.BrokerPartitionAssignment
 	OnEachMessageFunc             OnEachMessageFunc
 	OnCompletionFunc           OnCompletionFunc
 	bootstrapBrokers           []string
 	waitForMoreMessage         bool
 	alreadyProcessedTsNs       int64
+	activeProcessors           map[topic.Partition]*ProcessorState
+	activeProcessorsLock       sync.Mutex
 }
 
 func NewTopicSubscriber(bootstrapBrokers []string, subscriber *SubscriberConfiguration, content *ContentConfiguration, processor ProcessorConfiguration) *TopicSubscriber {
@@ -44,9 +47,11 @@ func NewTopicSubscriber(bootstrapBrokers []string, subscriber *SubscriberConfigu
 		SubscriberConfig:              subscriber,
 		ContentConfig:                 content,
 		ProcessorConfig:               &processor,
+		brokerPartitionAssignmentChan: make(chan *mq_pb.BrokerPartitionAssignment, 1024),
 		bootstrapBrokers:              bootstrapBrokers,
 		waitForMoreMessage:            true,
 		alreadyProcessedTsNs:          content.StartTime.UnixNano(),
+		activeProcessors:              make(map[topic.Partition]*ProcessorState),
 	}
 }
 

weed/mq/topic/partition.go

@@ -71,3 +71,13 @@ func (partition Partition) ToPbPartition() *mq_pb.Partition {
 		UnixTimeNs: partition.UnixTimeNs,
 	}
 }
+
+func (partition Partition) Overlaps(partition2 Partition) bool {
+	if partition.RangeStart >= partition2.RangeStop {
+		return false
+	}
+	if partition.RangeStop <= partition2.RangeStart {
+		return false
+	}
+	return true
+}