diff --git a/internal/msg_transfer/logic/online_history_msg_handler.go b/internal/msg_transfer/logic/online_history_msg_handler.go
index 7e5053df1..007896bd4 100644
--- a/internal/msg_transfer/logic/online_history_msg_handler.go
+++ b/internal/msg_transfer/logic/online_history_msg_handler.go
@@ -389,8 +389,11 @@ func (OnlineHistoryConsumerHandler) Cleanup(_ sarama.ConsumerGroupSession) error
 
 func (och *OnlineHistoryConsumerHandler) ConsumeClaim(sess sarama.ConsumerGroupSession,
 	claim sarama.ConsumerGroupClaim) error { // a instance in the consumer group
+	if sess == nil {
+		time.Sleep(100 * time.Millisecond)
+	}
 	log.NewDebug("", "online new session msg come", claim.HighWaterMarkOffset(), claim.Topic(), claim.Partition())
-	cMsg := make([]*sarama.ConsumerMessage, 0, 500)
+	cMsg := make([]*sarama.ConsumerMessage, 0, 1000)
 	t := time.NewTicker(time.Duration(100) * time.Millisecond)
 	var triggerID string
 	for {
@@ -398,8 +401,8 @@ func (och *OnlineHistoryConsumerHandler) ConsumeClaim(sess sarama.ConsumerGroupS
 		select {
 		case msg := <-claim.Messages():
 			cMsg = append(cMsg, msg)
-			if len(cMsg) >= 500 {
-				ccMsg := make([]*sarama.ConsumerMessage, 0, 500)
+			if len(cMsg) >= 1000 {
+				ccMsg := make([]*sarama.ConsumerMessage, 0, 1000)
 				for _, v := range cMsg {
 					ccMsg = append(ccMsg, v)
 
@@ -409,12 +412,12 @@ func (och *OnlineHistoryConsumerHandler) ConsumeClaim(sess sarama.ConsumerGroupS
 				och.msgDistributionCh <- Cmd2Value{Cmd: ConsumerMsgs, Value: TriggerChannelValue{
 					triggerID: triggerID, cmsgList: ccMsg}}
 				sess.MarkMessage(msg, "")
-				cMsg = make([]*sarama.ConsumerMessage, 0, 500)
+				cMsg = make([]*sarama.ConsumerMessage, 0, 1000)
 				log.Debug(triggerID, "length trigger msg consumer end", len(cMsg))
 			}
 		case <-t.C:
 			if len(cMsg) > 0 {
-				ccMsg := make([]*sarama.ConsumerMessage, 0, 500)
+				ccMsg := make([]*sarama.ConsumerMessage, 0, 1000)
 				for _, v := range cMsg {
 					ccMsg = append(ccMsg, v)
 				}
@@ -423,7 +426,7 @@ func (och *OnlineHistoryConsumerHandler) ConsumeClaim(sess sarama.ConsumerGroupS
 				och.msgDistributionCh <- Cmd2Value{Cmd: ConsumerMsgs, Value: TriggerChannelValue{
 					triggerID: triggerID, cmsgList: ccMsg}}
 				sess.MarkMessage(cMsg[len(cMsg)-1], "")
-				cMsg = make([]*sarama.ConsumerMessage, 0, 500)
+				cMsg = make([]*sarama.ConsumerMessage, 0, 1000)
 				log.Debug(triggerID, "timer trigger msg consumer end", len(cMsg))
 			}