let knowen peer to rejoin to the cluster

peer.go

@@ -250,6 +250,7 @@ func (p *Peer) sendVoteRequest(req *RequestVoteRequest, c chan *RequestVoteRespo
 	debugln("peer.vote: ", p.server.Name(), "->", p.Name())
 	req.peer = p
 	if resp := p.server.Transporter().SendVoteRequest(p.server, p, req); resp != nil {
+		debugln("peer.vote: recv", p.server.Name(), "<-", p.Name())
 		resp.peer = p
 		c <- resp
 	}

server.go

@@ -516,6 +516,8 @@ func (s *Server) candidateLoop() {
 				} else if resp.Term > s.currentTerm {
 					s.debugln("server.candidate.vote.failed")
 					s.setCurrentTerm(resp.Term, "", false)
+				} else {
+					s.debugln("server.candidate.vote: denied")
 				}
 
 			case e := <-s.c:
@@ -808,7 +810,7 @@ func (s *Server) AddPeer(name string) error {
 
 	// Do not allow peers to be added twice.
 	if s.peers[name] != nil {
-		return DuplicatePeerError
+		return nil
 	}
 
 	// Only add the peer if it doesn't have the same name.

server_test.go

@@ -403,7 +403,7 @@ func TestServerMultiNode(t *testing.T) {
 	}
 	mutex.RUnlock()
 
-	for i := 0; i < 20; i++ {
+	for i := 0; i < 200000; i++ {
 		retry := 0
 		fmt.Println("Round ", i)