Introduce virtual cluster IP and start that cluster IP on the host running ZK
leader
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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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