HA Cluster deployment of Orion context broker

Question

If I plan to install multiple instances of Orion context broker in a high availability scenario like described here , I am wondering how event notifications are handled?

So If I Register/subscribe to an specific Event, which occours then, will I be notified/called one time, or one time for each CB-instance?

Answer 1

In multi node deployment of Orion ContextBroker as described in referred document , there will be one notification to each event from the broker which will receive the request. The HAProxy will route each incoming request to one of multiple ContextBroker, thus one notification will be generated based on subscription made.

So If you Register/subscribe to an specific Event, then, you will be notified/called one time from one ContextBroker which has received the reuqest.

Answer 2

Some more references about Orion and HA/scaling-out, in the case they can be usefull:

• What would be the behavior of subscriptions and notifications in an Orion Load-Balancing scenario?
• How to scale Orion GE?