The Hazelcast plugin adds support for running multiple redundant Openfire servers together in a cluster. By running Openfire in a cluster, you can distribute the connection load among several servers, as well as having some form of failover in the event that one of your servers dies. This plugin is a drop-in replacement for the original Openfire clustering plugin that removes the dependency on an expensive proprietary third-party product.
The current Hazelcast release is version 2.3.1.