Evidence of cluster nodes is saved in database in the table Node, see Data model.
If there is no infomation about node is in database then it will be created when the application server starts.
Every node can be in three states:
- RUN - Node handles new and existing (saved messages in ESB) messages
- HANDLES_EXISTING_MESSAGES - Node handles only existing messages. New messages/requests are rejected. Used is Stopping mode.
- STOPPED - Node not handles existing messages and new messages
Every message has informace which on which node is being processed.
There is configuration property ohf.cluster.actualNodeInstance.code that defines unique code (name) of current running cluster node.