fix bug

internal/msg_transfer/logic/offline_history_msg_handler.go

@@ -276,7 +276,7 @@ func (OfflineHistoryConsumerHandler) Cleanup(_ sarama.ConsumerGroupSession) erro
 func (och *OfflineHistoryConsumerHandler) ConsumeClaim(sess sarama.ConsumerGroupSession,
 	claim sarama.ConsumerGroupClaim) error { // a instance in the consumer group
 	log.NewDebug("", "online new session msg come", claim.HighWaterMarkOffset(), claim.Topic(), claim.Partition())
-	cMsg := make([]*sarama.ConsumerMessage, 200, 500)
+	cMsg := make([]*sarama.ConsumerMessage, 0, 500)
 	t := time.NewTicker(time.Duration(500) * time.Millisecond)
 	var triggerID string
 	for msg := range claim.Messages() {