Patrick Hunt commented on ZOOKEEPER-127:

re stu's npe comment, is that true? I thought I had seen some code in the 
config processing that indicated that we allowed both host:port and 
host:port:port, does it npe if host:port is used?

Flavio please look into this and also ensure that the documentation is updated 
to reflect.

> Use of non-standard election ports in config breaks services
> ------------------------------------------------------------
>                 Key: ZOOKEEPER-127
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-127
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: quorum
>    Affects Versions: 3.0.0
>            Reporter: Mark Harwood
>            Assignee: Flavio Paiva Junqueira
>            Priority: Critical
>             Fix For: 3.0.0
>         Attachments: mhPortChanges.patch, ZOOKEEPER-127.patch, 
> ZOOKEEPER-127.patch, ZOOKEEPER-127.patch, ZOOKEEPER-127.patch, 
> ZOOKEEPER-127.patch, ZOOKEEPER-127.patch
> In QuorumCnxManager.toSend there is a call to create a connection as follows:
>     channel = SocketChannel.open(new InetSocketAddress(addr, port));
> Unfortunately "addr" is the ip address of a remote server while "port" is the 
> electionPort of *this* server.
> As an example, given this configuration (taken from my zoo.cfg)
>   server.1=
>   server.2=
>   server.3=
> Server 3 was observed trying to make a connection to host on port 
> 2883 and obviously failing.
> In tests where all machines use the same electionPort this bug would not 
> manifest itself.

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