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Logical Grouping of Java Virtual Machine Example

By grouping Java Virtual Machines (JVMs), you get a logical group of Hub Servers and Process Servers. When you deploy the Hub Server and Process Server applications in a logical JVM group, all communication between the applications stays within the group. To group JVMs, you assign a group ID to each JVM in the MDM Hub environment.

Process Server grouping is applicable to the cleanse and match process only. A Process Server that is enabled as a Zookeeper server and is enabled for smart search is available to all the groups for indexing and search processing.

The following table shows an example of logical JVM groups:

JVM Group	JVM	Hub Server	Process Server
Group1	JVM1	Yes	Yes
Group1	JVM4	-	Yes
Group2	JVM2	Yes	Yes
Group3	JVM3	-	Yes

For JVM1, add the following Java option in the startup script:

-Dmdm.node.groupid=Group1

For JVM2, add the following Java option in the startup script:

-Dmdm.node.groupid=Group2

For JVM3, add the following Java option in the startup script:

-Dmdm.node.groupid=Group3

For JVM4, add the following Java option in the startup script:

-Dmdm.node.groupid=Group1

After you configure the JVMs, and deploy the Hub Servers and Process Servers, the groups have the following characteristics:

Group1 has two Process Servers, Group2 has one Process Server, and Group3 has one Process Server.

All cleanse and batch calls stay in their own group with the exception of smart search. For example, any real-time call on the Hub Server in Group1 affects only the Group1 Process Servers (JVM1 and JVM4).

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