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Background documentation Clustering the J2EE Engine  Locate the document in its SAP Library structure

This section is an introduction to the J2EE Engine cluster. It provides information about:

·        The J2EE Engine cluster architecture

·        Procedures how to scale the J2EE Engine cluster

·        The initial configuration steps to run your J2EE Engine cluster

·        Links to more advanced configuration topics

What is a Cluster?

The cluster is a set of processes that work together to build a scalable and reliable system. The cluster structure is transparent to the clients and appears to them as a single server unit.

The J2EE Engine cluster consists of one or more Java dispatchers, several server processes, the Central Services (Message Service and Enqueue Service), and the database. For more information, see Java Cluster Architecture.

Why Clustering?

Clustering provides the following advantages:

·        Scalability of the system – In case of high system load, you can easily enlarge the current system.

·        High availability of the system – The set of mechanisms that the system provides guarantees normal system operation with its ability to transparently recover in case of failures within the cluster.

To make use of the clustering features, you need to set up and configure the J2EE Engine according to the deployed applications and the expected workload. For more information, see Java Cluster Setup and Configuring the J2EE Engine Cluster.

 

See also:

·        Mandatory Configuration of the J2EE Engine

·        Optional Configuration of the J2EE Engine

·        Starting and Stopping the J2EE Engine

 

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