Hazelcast Heroku Discovery 
This Hazelcast Discovery Plugin provides the possibility to lookup IP addresses of other members by resolving those requests against the Heroku DNS Discovery in Heroku Private Spaces.
Usage
A minimal hazelcast.xml looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.7.xsd"
xmlns="http://www.hazelcast.com/schema/config"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<properties>
<property name="hazelcast.discovery.enabled">true</property>
</properties>
<network>
<join>
<!-- deactivate normal discovery -->
<multicast enabled="false"/>
<tcp-ip enabled="false" />
<!-- activate the Heroku DNS Discovery -->
<discovery-strategies>
<discovery-strategy
enabled="true"
class="com.github.jkutner.hazelcast.HerokuDiscoveryStrategy">
</discovery-strategy>
</discovery-strategies>
</join>
</network>
</hazelcast>Hazelcast Discovery SPI
Hazelcast, since 3.6, offers a, so called, Discovery SPI to integrate external discovery mechanisms into the system. For more information please rely on the official documentation, available here.
Configuration
No configuration is required. The plugin will detect the service name from the $HEROKU_DNS_FORMATION_NAME environment variable set by Heroku.
