Fix ping bootstrap

api/service/discovery/service.go

@@ -74,7 +74,6 @@ func (s *Service) Run() {
 }
 
 func (s *Service) contactP2pPeers() {
-	pingInterval := 1
 
 	nodeConfig := nodeconfig.GetShardConfig(s.config.ShardID)
 	// Don't send ping message for Explorer Node
@@ -86,6 +85,8 @@ func (s *Service) contactP2pPeers() {
 	msgBuf := host.ConstructP2pMessage(byte(0), pingMsg.ConstructPingMessage())
 	s.sentPingMessage(s.config.ShardGroupID, msgBuf)
 
+	pingInterval := 5
+	initialFlatRetries := 20 // no expotential backoff for 20 times.
 	for {
 		select {
 		case peer, ok := <-s.peerChan:
@@ -110,9 +111,13 @@ func (s *Service) contactP2pPeers() {
 		// the longest sleep is 3600 seconds
 		if pingInterval >= 3600 {
 			pingInterval = 3600
+		} else {
+			if initialFlatRetries > 0 {
+				initialFlatRetries--
 			} else {
 				pingInterval *= 2
 			}
+		}
 		time.Sleep(time.Duration(pingInterval) * time.Second)
 	}
 }