Cluster Coordinator requirements

The Cluster Coordinator service of the Endeca Server cluster must be running on an odd number of machines (with a minimum of three) on which the Endeca Server cluster is running.

The Cluster Coordinator service is installed as part of the Endeca Server. However, in an Endeca Server cluster, its service is required to run on at least three (or any other odd number greater than three) machines, to ensure increased availability of the Endeca Server cluster services, including services for its data domains.

As a result of this requirement, the instructions in this section imply that you will be initially installing and deploying an Endeca Server cluster on three machines, and that on each of these machines, both the Endeca Server and the Cluster Coordinator services will be running.

Note: While it is possible to run a cluster of one on a single machine, or a cluster of two, these Endeca Server clusters do not provide increased availability features, such as automatic leader election for the Endeca data domains.

If after initially deploying a three-machine cluster you would like to extend it, you can add another machine to the WebLogic domain. For the fourth machine, the Cluster Coordinator services should not be running. However, if you add a fifth machine, you can then run the Cluster Coordinator on either three of the five machines, or on all five machines. Both of these configurations will satisfy the Cluster Coordinator requirements for the Endeca Server cluster.

For full information on the Cluster Coordinator, its functions and requirements, see the Oracle Endeca Server Cluster Guide.