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3.1.1. Structure of a DX Content Router Node

DX Content Router consists of a server machine running Linux and executes one or both of two

services:

1. Publisher - processes all streams stored in a cluster, filters them based on stream metadata, and

publishes UUIDs to remote Subscribers.

2. Subscriber - retrieves UUID publications from remote Publishers. A Replicator, the most

common subscriber, retrieves remote UUIDs and sends replication requests to local nodes

and must be installed on a server in the same subnet as its target storage cluster. A 3rd party

application, which may or may not be installed on a node with other DX Content Router services,

can also function as a subscriber by integrating with the Enumerator API defined in the Appendix.

DX Content Router service configuration parameters are used to enable one or both services,

depending on the intended network topology. For the simple example in the previous section, where

a primary cluster replicates in one direction to a single DR cluster and all nodes in both clusters are

mutually visible, the DX Content Router in the primary cluster would likely be configured to run only

the Publisher service and the DX Content Router in the DR cluster would run just the Subscriber. A

slightly more complex example would be a pair of mirrored clusters where all nodes in both clusters

still have mutual visibility. DX Content Router servers for this topology would look like the diagram

below. For clarity, the assumed direct connections between storage nodes in the two clusters as

shown and discussed in the previous example have been omitted.

Version 2.2

December 2010