revert to one subscriber one thread

weed/messaging/broker/broker_grpc_server_subscribe.go

@@ -48,7 +48,6 @@ func (broker *MessageBroker) Subscribe(stream messaging_pb.SeaweedMessaging_Subs
 		Partition: in.Init.Partition,
 	}
 	lock := broker.topicManager.RequestLock(tp, topicConfig, false)
-	subscription := lock.subscriptions.AddSubscription(subscriberId)
 	defer broker.topicManager.ReleaseLock(tp, false)
 
 	lastReadTime := time.Now()
@@ -103,7 +102,9 @@ func (broker *MessageBroker) Subscribe(stream messaging_pb.SeaweedMessaging_Subs
 	}
 
 	err = lock.logBuffer.LoopProcessLogData(lastReadTime, func() bool {
-		subscription.Wait()
+		lock.Mutex.Lock()
+		lock.cond.Wait()
+		lock.Mutex.Unlock()
 		return true
 	}, eachLogEntryFn)
 

weed/messaging/broker/subscription.go

@@ -1,82 +0,0 @@
-package broker
-
-import (
-	"sync"
-)
-
-type TopicPartitionSubscription struct {
-	sync.Mutex
-	name         string
-	lastReadTsNs int64
-	cond         *sync.Cond
-}
-
-func NewTopicPartitionSubscription(name string) *TopicPartitionSubscription {
-	t := &TopicPartitionSubscription{
-		name: name,
-	}
-	t.cond = sync.NewCond(t)
-	return t
-}
-
-func (s *TopicPartitionSubscription) Wait() {
-	s.Mutex.Lock()
-	s.cond.Wait()
-	s.Mutex.Unlock()
-}
-
-func (s *TopicPartitionSubscription) NotifyOne() {
-	// notify one waiting goroutine
-	s.cond.Signal()
-}
-
-type TopicPartitionSubscriptions struct {
-	sync.Mutex
-	cond              *sync.Cond
-	subscriptions     map[string]*TopicPartitionSubscription
-	subscriptionsLock sync.RWMutex
-}
-
-func NewTopicPartitionSubscriptions() *TopicPartitionSubscriptions {
-	m := &TopicPartitionSubscriptions{
-		subscriptions: make(map[string]*TopicPartitionSubscription),
-	}
-	m.cond = sync.NewCond(m)
-	return m
-}
-
-func (m *TopicPartitionSubscriptions) AddSubscription(subscription string) *TopicPartitionSubscription {
-	m.subscriptionsLock.Lock()
-	defer m.subscriptionsLock.Unlock()
-
-	if s, found := m.subscriptions[subscription]; found {
-		return s
-	}
-
-	s := NewTopicPartitionSubscription(subscription)
-	m.subscriptions[subscription] = s
-
-	return s
-
-}
-
-func (m *TopicPartitionSubscriptions) NotifyAll() {
-
-	m.subscriptionsLock.RLock()
-	defer m.subscriptionsLock.RUnlock()
-
-	for name, tps := range m.subscriptions {
-		println("notifying", name)
-		tps.NotifyOne()
-	}
-
-}
-
-func (m *TopicPartitionSubscriptions) Wait() {
-	m.Mutex.Lock()
-	m.cond.Wait()
-	for _, tps := range m.subscriptions {
-		tps.NotifyOne()
-	}
-	m.Mutex.Unlock()
-}

weed/messaging/broker/topic_manager.go

@@ -31,23 +31,22 @@ type TopicControl struct {
 	subscriberCount int
 	publisherCount  int
 	logBuffer       *log_buffer.LogBuffer
-	subscriptions   *TopicPartitionSubscriptions
 }
 
 type TopicManager struct {
 	sync.Mutex
-	topicCursors map[TopicPartition]*TopicControl
+	topicControls map[TopicPartition]*TopicControl
 	broker        *MessageBroker
 }
 
 func NewTopicManager(messageBroker *MessageBroker) *TopicManager {
 	return &TopicManager{
-		topicCursors: make(map[TopicPartition]*TopicControl),
+		topicControls: make(map[TopicPartition]*TopicControl),
 		broker:        messageBroker,
 	}
 }
 
-func (tm *TopicManager) buildLogBuffer(tc *TopicControl, tp TopicPartition, topicConfig *messaging_pb.TopicConfiguration) *log_buffer.LogBuffer {
+func (tm *TopicManager) buildLogBuffer(tl *TopicControl, tp TopicPartition, topicConfig *messaging_pb.TopicConfiguration) *log_buffer.LogBuffer {
 
 	flushFn := func(startTime, stopTime time.Time, buf []byte) {
 
@@ -69,7 +68,7 @@ func (tm *TopicManager) buildLogBuffer(tc *TopicControl, tp TopicPartition, topi
 		}
 	}
 	logBuffer := log_buffer.NewLogBuffer(time.Minute, flushFn, func() {
-		tc.subscriptions.NotifyAll()
+		tl.cond.Broadcast()
 	})
 
 	return logBuffer
@@ -79,11 +78,11 @@ func (tm *TopicManager) RequestLock(partition TopicPartition, topicConfig *messa
 	tm.Lock()
 	defer tm.Unlock()
 
-	tc, found := tm.topicCursors[partition]
+	tc, found := tm.topicControls[partition]
 	if !found {
 		tc = &TopicControl{}
-		tm.topicCursors[partition] = tc
-		tc.subscriptions = NewTopicPartitionSubscriptions()
+		tc.cond = sync.NewCond(&tc.Mutex)
+		tm.topicControls[partition] = tc
 		tc.logBuffer = tm.buildLogBuffer(tc, partition, topicConfig)
 	}
 	if isPublisher {
@@ -98,7 +97,7 @@ func (tm *TopicManager) ReleaseLock(partition TopicPartition, isPublisher bool)
 	tm.Lock()
 	defer tm.Unlock()
 
-	lock, found := tm.topicCursors[partition]
+	lock, found := tm.topicControls[partition]
 	if !found {
 		return
 	}
@@ -108,7 +107,7 @@ func (tm *TopicManager) ReleaseLock(partition TopicPartition, isPublisher bool)
 		lock.subscriberCount--
 	}
 	if lock.subscriberCount <= 0 && lock.publisherCount <= 0 {
-		delete(tm.topicCursors, partition)
+		delete(tm.topicControls, partition)
 		lock.logBuffer.Shutdown()
 	}
 }
@@ -117,7 +116,7 @@ func (tm *TopicManager) ListTopicPartitions() (tps []TopicPartition) {
 	tm.Lock()
 	defer tm.Unlock()
 
-	for k := range tm.topicCursors {
+	for k := range tm.topicControls {
 		tps = append(tps, k)
 	}
 	return