What is required on any node that runs an instance of VizQL Server?

For any node that runs an instance of VizQL Server, it is essential to have a Gateway service operational. The Gateway acts as a central access point, facilitating communication between clients and the VizQL Server. It is responsible for handling requests from users and routing them to the appropriate VizQL Server instances based on load balancing and availability.

The presence of the Gateway service ensures that user requests are managed efficiently, enabling seamless interaction with the visualization and data retrieval processes. This service is crucial for the overall architecture, as it connects the front-end client with the back-end data processing services, including the VizQL Server, which generates visualizations based on queries from the clients.

Understanding the role of the Gateway provides insight into the necessary architecture for Tableau Server, emphasizing the importance of enabling user access while effectively managing workloads and resources.