What process is mandatory on nodes with instances of VizQL Server or Vizportal/Application Server?

The process that is mandatory on nodes with instances of VizQL Server or Vizportal/Application Server is the Gateway. The Gateway acts as a bridge between the web clients and the server processes, handling incoming requests for resources such as visualizations and data queries. It is essential for efficiently routing these requests to the appropriate services or processes within Tableau Server, ensuring seamless interaction between users and the analytics environment.

Since the Gateway is crucial for the functioning of VizQL Servers and Vizportal/Application Servers, it allows users to submit queries and receive responses effectively. It manages the distribution of sessions and facilitates load balancing across multiple server instances, contributing to the high availability and performance of the Tableau environment.

The other processes listed do not hold this mandatory role specifically related to communication and resource routing within these server instances, making the Gateway a vital component in maintaining the integrity and efficiency of the Tableau Server architecture.