Github user afine commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/184#discussion_r110227948
  
    --- Diff: src/java/main/org/apache/zookeeper/server/quorum/Leader.java ---
    @@ -216,18 +218,35 @@ public boolean isQuorumSynced(QuorumVerifier qv) {
         
         private final ServerSocket ss;
     
    -    Leader(QuorumPeer self,LeaderZooKeeperServer zk) throws IOException {
    +    Leader(QuorumPeer self,LeaderZooKeeperServer zk) throws IOException, 
X509Exception {
             this.self = self;
             try {
    -            if (self.getQuorumListenOnAllIPs()) {
    -                ss = new ServerSocket(self.getQuorumAddress().getPort());
    +            if (self.shouldUsePortUnification()) {
    --- End diff --
    
    This is a tough call IMO. I think you are correct that moving this out of 
the Leader would make the leader code simpler but on the other hand this is 
logic that I think "belongs" to the leader and is not really relevant anywhere 
else.
    
    What do you think about the compromise of moving this to a static method in 
Leader where it can be tested and prevents cluttering up the constructor logic?


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