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https://issues.apache.org/jira/browse/ZOOKEEPER-1031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13013735#comment-13013735
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Benjamin Reed commented on ZOOKEEPER-1031:
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a leader needs to be running on the virtual IP. it just needs to be a machine
with an accurate view of the system. obviously the leader has such a view, but
so do the followers of the leader.
> Introduce virtual cluster IP and start that cluster IP on the host running ZK
> leader
> ------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-1031
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1031
> Project: ZooKeeper
> Issue Type: Wish
> Components: leaderElection, quorum
> Affects Versions: 3.3.3
> Reporter: Vishal K
> Priority: Minor
> Fix For: 4.0.0
>
>
> It would be useful to enable a way to specify a virtual (floating) IP for the
> ZK cluster (say in zoo.cfg). The ZK leader will start this IP on one of its
> interfaces. If the leadership changes, the cluster IP will be taken over by
> the new leader. This IP can be used to identify the ZK leader and send
> administrative commands/query to the leader. For example,
> - a ZK client can get the list of ZK servers in the configuration by sending
> a request to the server running this IP address. The client just needs to
> know one IP address. Availability of cluster automatically ensures
> availability of
> the IP address.
> - To reconfigure ZK configuration, a client can send reconfig request to the
> server on this IP and keep retrying until the request succeeds or fails.
> Implementation issues:
> 1. The old ZK leader that has lost leadership should be able to somehow give
> up the virtual IP address. Otherwise, it could lead to collisions. One
> solution is to self reboot. A system property can be used to specify ways to
> unplumb the cluster IP
> 2. Cross-platform support.
> 3. Refreshing ARP caches
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