symat commented on a change in pull request #1254: ZOOKEEPER-2164: Quorum 
members can not rejoin after restart
URL: https://github.com/apache/zookeeper/pull/1254#discussion_r381856296
 
 

 ##########
 File path: 
zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumCnxManager.java
 ##########
 @@ -552,10 +577,13 @@ private void handleConnection(Socket sock, 
DataInputStream din) throws IOExcepti
                 try {
                     InitialMessage init = 
InitialMessage.parse(protocolVersion, din);
                     sid = init.sid;
-                    electionAddr = new MultipleAddresses(init.electionAddr,
-                        
Duration.ofMillis(self.getMultiAddressReachabilityCheckTimeoutMs()));
+                    if (!init.electionAddr.isEmpty()) {
 
 Review comment:
   well, theoretically it is possible that someone adds both wildcard address 
and normal IP / FQDN for a multi-address config, but that doesn't make much 
sense. I would rather throw an exception at startup in this case... The whole 
point of multi-address is to use different networks for redundancy, so you 
should always provide FQDN / IP there.

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