How session affinity is used

When a WebLogic Server node hosting Studio and Dgraph Gateway receives a client request, it routes the request to a Dgraph node using session affinity, based on the session ID specified in the header of the request.

When end users issue queries, Studio sets the session ID for the requests in the HTTP headers. Requests with the same session ID are routed to the same Dgraph node. If the BDD software cannot locate the session ID, it relies on a round-robin strategy for deciding which Dgraph node the request should be routed to.

Note that session affinity is enabled by default, via the endeca-session-id-key and endeca-session-id-type properties in the request headers.