diff --git a/weed/messaging/broker/topic_manager.go b/weed/messaging/broker/topic_manager.go
index 7cc8601eb..e9f8903e8 100644
--- a/weed/messaging/broker/topic_manager.go
+++ b/weed/messaging/broker/topic_manager.go
@@ -25,7 +25,7 @@ func (tp *TopicPartition) String() string {
 	return fmt.Sprintf(TopicPartitionFmt, tp.Namespace, tp.Topic, tp.Partition)
 }
 
-type TopicCursor struct {
+type TopicControl struct {
 	sync.Mutex
 	cond            *sync.Cond
 	subscriberCount int
@@ -36,18 +36,18 @@ type TopicCursor struct {
 
 type TopicManager struct {
 	sync.Mutex
-	topicCursors map[TopicPartition]*TopicCursor
+	topicCursors map[TopicPartition]*TopicControl
 	broker       *MessageBroker
 }
 
 func NewTopicManager(messageBroker *MessageBroker) *TopicManager {
 	return &TopicManager{
-		topicCursors: make(map[TopicPartition]*TopicCursor),
+		topicCursors: make(map[TopicPartition]*TopicControl),
 		broker:       messageBroker,
 	}
 }
 
-func (tm *TopicManager) buildLogBuffer(tl *TopicCursor, tp TopicPartition, topicConfig *messaging_pb.TopicConfiguration) *log_buffer.LogBuffer {
+func (tm *TopicManager) buildLogBuffer(tc *TopicControl, tp TopicPartition, topicConfig *messaging_pb.TopicConfiguration) *log_buffer.LogBuffer {
 
 	flushFn := func(startTime, stopTime time.Time, buf []byte) {
 
@@ -69,29 +69,29 @@ func (tm *TopicManager) buildLogBuffer(tl *TopicCursor, tp TopicPartition, topic
 		}
 	}
 	logBuffer := log_buffer.NewLogBuffer(time.Minute, flushFn, func() {
-		tl.subscriptions.NotifyAll()
+		tc.subscriptions.NotifyAll()
 	})
 
 	return logBuffer
 }
 
-func (tm *TopicManager) RequestLock(partition TopicPartition, topicConfig *messaging_pb.TopicConfiguration, isPublisher bool) *TopicCursor {
+func (tm *TopicManager) RequestLock(partition TopicPartition, topicConfig *messaging_pb.TopicConfiguration, isPublisher bool) *TopicControl {
 	tm.Lock()
 	defer tm.Unlock()
 
-	lock, found := tm.topicCursors[partition]
+	tc, found := tm.topicCursors[partition]
 	if !found {
-		lock = &TopicCursor{}
-		tm.topicCursors[partition] = lock
-		lock.subscriptions = NewTopicPartitionSubscriptions()
-		lock.logBuffer = tm.buildLogBuffer(lock, partition, topicConfig)
+		tc = &TopicControl{}
+		tm.topicCursors[partition] = tc
+		tc.subscriptions = NewTopicPartitionSubscriptions()
+		tc.logBuffer = tm.buildLogBuffer(tc, partition, topicConfig)
 	}
 	if isPublisher {
-		lock.publisherCount++
+		tc.publisherCount++
 	} else {
-		lock.subscriberCount++
+		tc.subscriberCount++
 	}
-	return lock
+	return tc
 }
 
 func (tm *TopicManager) ReleaseLock(partition TopicPartition, isPublisher bool) {