Hi Kunal,

Enclosed are the settings for the prconfig for hazelcast;

1. ("cluster/hazelcast/ports", "5701-5800") - specify range of the hazelcast ports and make sure these are available not blocked
2. ("cluster/hazelcast/multicast/enabled", false) - by default set to false and do not change this value
3. ("identification/cluster/name") - the full text search cluster name, either user specified or auto generated
4. ("cluster/hazelcast/interface") - refer https://community.pega.com/support/support-articles/hazelcast-nodes-do-not-auto-detect-across-dmz
5. ("cluster/hazelcast/members") - refer https://community.pega.com/support/support-articles/hazelcast-nodes-do-not-auto-detect-across-dmz
   Example:  <env name="cluster/hazelcast/members" value=" Proprietary information hidden, Proprietary information hidden" />        -- list of values, ip addresses
             <env name="cluster/hazelcast/members" value=" Proprietary information hidden-99" />                 -- range of values (.85-.99 inclusive)
6. ("cluster/hazelcast/heartbeat", "OFF") - by default set to false
7. ("alerts/cluster/clockdeltathreshold", 10): refer https://pdn.pega.com/performance/understanding-the-pega0055-alert-clock-drift-exceeded-the-configured-time-threshold
8. ("identification/cluster/protocol" , "hazelcast") - default clustering topology set to hazelcast
9. ("identification/cluster/logging" , "")           -- yes, an empty string. Used for debug purpose
   This is used along with below in prlogging.xml for debug purposes if the hazelcast is failing to forma cluster
   <appender name="HAZELCAST" class="com.pega.pegarules.priv.util.DailySizeRollingFileAppenderPega">
   <param name="FileNamePattern" value="'@{web.tmpdir}/PegaHAZELCAST-'yyyy-MMM-dd'.log'"/>
   <param name="MaxFileSize" value="50MB" />
   <layout class="com.pega.apache.log4j.PatternLayout">
    <param name="ConversionPattern" value="%d [%20.20t] [%20.20X{tenantid}] [%20.20X{app}] (%30.30c{3}) %-5p %X{stack} %X{userid} - %m%n"/>
   </layout>
  </appender>

<category name="com.hazelcast">
  <priority value="info"/>
  <appender-ref ref="HAZELCAST"/>
  </category>

In your scenario, settings 1,2, 4 and 5 need to be added.

Example: Say if you have two nodes;

NODE 1:
<env name="cluster/hazelcast/ports" value="5701-5800"/> <!-- available ports that have access across the firewall for use by our cluster -->
<env name="cluster/hazelcast/interface" value="xx.x.xxx.xx"/> <!-- The IP address that I will listen to -->
<env name="cluster/hazelcast/multicast/enabled" value="false"/>
<env name="cluster/hazelcast/members" value="xx.x.xxx.*"/> <!-- optional list of IPs for other members in our cluster - can be a range or comma separated -->

NODE 2:

<env name="cluster/hazelcast/ports" value="5701-5800"/> <!-- available ports that have access across the firewall for use by our cluster -->
<env name="cluster/hazelcast/interface" value="xx.x.xxx.xx"/> <!-- The IP address that I will listen to -->
<env name="cluster/hazelcast/multicast/enabled" value="false"/>
<env name="cluster/hazelcast/members" value="xx.x.xxx.*"/> <!-- optional list of IPs for other members in our cluster - can be a range or comma separated -->

You have to make sure that the above nodes are started serially(one by one) and not paralell to make sure that the hazelcast cluster is formed appropriately. You will also notice it in the PegaRULES logs the cluster details with hazelcast members with their IP address and ports

---sample from the PRPC logfile----
Members [2] {
Member [XX.XX.XXX.XXX]:5702
Member [XX.XX.XXX.XXX]:5701 this

}

In PRPC v7.3.1 there is a support for both hazelcast and ignite clustering topology. You can refer to this PDN https://collaborate.pega.com/question/clustering-topology-apache-ignite-vs-hazlecast for more information.

Let me know if above information helps.

Regards,

Basavaraj Kadakol