Reference: Notebook & Cluster Communication

Communication

First a request is sent from the Notebook to the Elastic Load Balancer at port 80. Then a Websocket request is sent by the browser at port 8083. The request hits the Elastic Load Balancer it is redirected to the Zepplin Server running on the cluster master at 8082. Once the handshake happens the Websocket connection is established between the browser and the cluster master the browser sends and receives requests and responses with the cluster master at port 8084.

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