diff --git a/monitor/client.go b/monitor/client.go
index 60d6f14..dfb8e63 100644
--- a/monitor/client.go
+++ b/monitor/client.go
@@ -326,38 +326,45 @@ func (client *KafkaClient) RefreshMetaData() {
 
 	//group description
 	topic2Consumer := map[string]map[string]bool{}
-	for _, broker := range client.client.Brokers() {
-		if ok, _ := broker.Connected(); !ok {
-			broker.Open(client.client.Config())
+	groupsPerBroker := make(map[*sarama.Broker][]string)
+	for _, group := range groupList {
+		controller, err := client.client.Coordinator(group)
+		if err != nil {
+			log.Warnf("Coordinator group:%s error : %v", group, err)
+			return
 		}
-		resp, err := broker.DescribeGroups(&sarama.DescribeGroupsRequest{Groups: groupList})
+		groupsPerBroker[controller] = append(groupsPerBroker[controller], group)
+	}
+
+	for broker, brokerGroups := range groupsPerBroker {
+		response, err := broker.DescribeGroups(&sarama.DescribeGroupsRequest{
+			Groups: brokerGroups,
+		})
 		if err != nil {
-			log.Warnf("DescribeGroups error : %v", err)
+			log.Warnf("get groupDescribe fail:%v", err)
 			continue
-		} else {
-			for _, desc := range resp.Groups {
-				for _, gmd := range desc.Members {
-					metadata, err2 := gmd.GetMemberMetadata()
-					if err2 != nil {
-						log.Warnf("GetMemberMetadata error : %v", err)
-						continue
-					} else {
-						for _, topic := range metadata.Topics {
-							if _, ok := client.topicMap[topic]; !ok {
-								continue
-							}
-							if _, ok := topic2Consumer[topic]; !ok {
-								topic2Consumer[topic] = make(map[string]bool)
-							}
-							topic2Consumer[topic][desc.GroupId] = true
+		}
+		for _, desc := range response.Groups {
+			for _, gmd := range desc.Members {
+				metadata, err2 := gmd.GetMemberMetadata()
+				if err2 != nil {
+					log.Warnf("GetMemberMetadata error : %v", err)
+					continue
+				} else {
+					for _, topic := range metadata.Topics {
+						if _, ok := client.topicMap[topic]; !ok {
+							continue
+						}
+						if _, ok := topic2Consumer[topic]; !ok {
+							topic2Consumer[topic] = make(map[string]bool)
 						}
+						topic2Consumer[topic][desc.GroupId] = true
 					}
 				}
 			}
 		}
 	}
 
-	log.Debugf("topic2Consumer %v \n", topic2Consumer)
 	for topic, consumerMap := range topic2Consumer {
 		client.topic2Consumer[topic] = make([]string, 0, len(consumerMap))
 		for group := range consumerMap {
@@ -366,13 +373,13 @@ func (client *KafkaClient) RefreshMetaData() {
 			}
 			for _, reg := range client.groupFilterRegexps {
 				if reg.MatchString(group) {
-					groupList = append(groupList, group)
 					break
 				}
 			}
 			client.topic2Consumer[topic] = append(client.topic2Consumer[topic], group)
 		}
 	}
+	log.Debugf("topic2Consumer %v \n", client.topic2Consumer)
 }
 
 func withWriteLock(lock *sync.RWMutex, fn func()) {
diff --git a/monitor/importer.go b/monitor/importer.go
index 9536902..c9d2aa6 100644
--- a/monitor/importer.go
+++ b/monitor/importer.go
@@ -70,6 +70,7 @@ func (i *Importer) start() {
 				}
 				if entry.Offset < 0 {
 					fields["lag"] = -1
+					continue
 				}
 
 				tm := time.Unix(msg.Timestamp/1000, 0)