specifying public address of apache ignite node with zookeeper discovery - apache-zookeeper

Question

I have 3 apache ignite nodes in 3 different datacenters.
datacenter-1
datacenter-2
datacenter-3
The nodes are visible externally(and to each other) as ignite-1-datacenter-1.myorg.com ,ignite-2-datacenter-2.myorg.com,
and ignite-3-datacenter-3.myorg.com.
When I start a node, say node-1 in datacenter-1, I want to inform zookeeper that the other 2 nodes should
connect to this node using the address ignite-1-datacenter-1.myorg.com.
How do I achieve that?
ZookeeperDiscoverySpi = new ZookeeperDiscoverySpi();
zk.setZKConnectionString("my-zookeeper-address");
IgniteConfiguratin cfg = new IgniteConfiguration();
cfg.setDiscovery(zk)
Ignite i = Ignition.start(cfg);

Answer 1

I believe that this line gives us some intel about addresses that the SPI reports to Zookeeper. It seems like it should enough to specify a reachable host name here. More information could be found in the documentation. Rough example for the ignite-1-datacenter-1.myorg.com could look like:
<bean class="org.apache.ignite.configuration.IgniteConfiguration">
<property name="localHost" value="ignite-1-datacenter-1.myorg.com"/>
...
</bean>

Answer 2

The following code snippet worked for me.
ZookeeperDiscoverySpi = new ZookeeperDiscoverySpi();
zk.setZKConnectionString("my-zookeeper-address");
InetAddress local = InetAddres.getLocalHost();
Map<String, String> addresses = new HashMap<>();
String externalOrPublicNameForThisNode = "ignite-1-datacenter-1.myorg.com";
addresses.put(local.getHostAddress, externalOrPublicNameForThisNode );
AddressResolver resolver = new BasicAddressResolver(addresses);
TcpCommunicationSpi commSpi = new TcpCommunicationSpi();
commSpi.setAddressResolver(resolver);
IgniteConfiguration igniteConfig = new IgniteConfiguration();
igniteConfig.setCommunicationSpi(commSpi);
igniteConfig.setAddressResolver(resolver);
igniteConfig.setDiscovery(zk);
Ignite i = Ignition.start(igniteConfig);