public static boolean isClusterMember(byte[] nodeID) {
        for (ClusterNodeInfo nodeInfo : getNodesInfo()) {
            if (nodeInfo.getNodeID().equals(nodeID)) {
                return true;
            }
        }
        return false;
    }
Returns true if the specified node ID belongs to a known cluster node
of this cluster.

@param nodeID the ID of the node to verify.
@return true if the specified node ID belongs to a known cluster node
        of this cluster.
xmppserver/src/main/java/org/jivesoftware/openfire/cluster/ClusterManager.java