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Got some info from this related question: Using SignalR with Azure Service Fabric
Quote in quote from that comment history: "After deploying this application, you can see that some calls to signalR fails and Some succeeds...."
Just want to know if anybody had similar implementation (signalR with Web API...). And I don't want to set instance count 1 for the stateless Web API.
You can configure LoadBalancer that is used by Service Fabric to persist session. This will result in particular client ending up always in the same node.
You can do it by accessing LoadBalancer assigned to service fabric cluster in azure portal. Then go to "Load balancing rules", select rule that is responsible for signalR port and set "Session persistence" to "Client IP". This can also be done from PowerShell or ARM template.