I am trying to setup a Kaa cluster with 3 kaa-node servers. The bootstrap server information will be set in sdk while generating sdk. And endpoint will connect to bootstrap server by it and get operation server information. If an endpoint is connecting to Kaa-server and the 4th Kaa-node server be added into the Kaa cluster, the endpoint's bootstrap server information and operation server information will be update immediately?? Or we need to generate new sdk to get the newest bootstrap server information??
You need to generate new SDK to update the list of bootstrap servers if you add a new one. Usually, you add a new Kaa node configured solely as operation server to scale your performance. The existed bootstrap servers will take care of looking up ones for processing requests from EPs. How to configure Kaa node only as operation server, see - system configuration