One or more data domain clusters can be hosted in a clustered Endeca Server deployment. This topic introduces the data domain cluster and describes its capabilities.
A data domain cluster is a set of Dgraph processes that together handle requests for a given data domain. One of these Dgraph processes is responsible for handling all write operations (updates, configuration changes), while the remaining Dgraph processes serve as read-only. All Dgraph nodes in a given data domain cluster utilize the same index residing on shared storage. Each data domain cluster node is hosted on a separate Endeca Server node.
In this guide, the term Dgraph node is used interchangeably with the term data domain node. The Dgraph node is the node in the data domain cluster that runs the Dgraph process. The Dgraph process of the Oracle Endeca Server is the main computational module that provides the features of the Endeca Server, such as search, refinement computation, and Guided Navigation. For information about the capabilities of the Dgraph process, see the Oracle Endeca Server Developer's Guide.
Additionally, the term data domain is used interchangeably with the term data domain cluster.
For definitions of the data domain cluster and the data domain nodes see Data domain cluster concepts.