In order to increase scalability and high availability you are configuring WebLogic clustering with JMS distributed destinations.
Which recommendation will ensure optimal load balancing of the message processing?
A. The machines that host the cluster should have similar processing power, disk space, and memory.
B. The cluster should include at least one configurable server.
C. The cluster should use unicast communication.
D. All servers in the cluster should be assigned to the same WebLogic machine.
Correct Answer: A
Explanation/Reference:
A uniform distributed destination (UDD), compared to weighted Distributed Destinations, greatly simplifies the management and development of distributed destination applications.Using uniform distributed destinations, you no longer need to create or designate destination members, but instead rely on WebLogic
Server to uniformly create the necessary members on the JMS servers to which a JMS module is targeted. This feature ensures the consistent configuration of all distributed destination parameters, particularly in regards to weighting, security, persistence, paging, and quotas.
Incorrect Answers:
C: The benefits of multicasting include:
Near real-time delivery of messages to host group.
High scalability due to the reduction in the amount of resources required by the JMS server to deliver messages to topic subscribers in a cluster.
D: A distributed destination is a set of destinations (queues or topics) that are accessible as a single, logical destination to a client. A distributed destination has the following characteristics:
* It is referenced by its own JNDI name.
* Members of the set are usually distributed across multiple servers within a cluster, with each destination member belonging to a separate JMS server
Reference: https://docs.oracle.com/cd/E11035_01/wls100/jms_admin/advance_config.html#wp1079177
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