How to maintain state in SignalR running on a cluster in scale-out scenarios?

Question

User493649383 posted

How does the SignalR hub maintain the information about groups and their members across multiple instances running on a cluster in scale-out scenarios, using a backplane? Can we in a similar way maintain some information in a custom data structure across all instances of SignalR hub running on a cluster? I am using Azure Service Bus backplane in my application for scale-out.

Answer 1

User61956409 posted

Hi faizalhasanwala,

Welcome to ASP.NET forums.

How does the SignalR hub maintain the information about groups and their members across multiple instances running on a cluster in scale-out scenarios, using a backplane? Can we in a similar way maintain some information in a custom data structure across all instances of SignalR hub running on a cluster?

I checked the ASP.NET SignalR documentation and GitHub source, ASP.NET SignalR team seems not share underlay implementation of maintaining the information about groups.

https://docs.microsoft.com/en-us/aspnet/signalr/overview/guide-to-the-api/hubs-api-guide-server#how-to-manage-group-membership-from-the-hub-class

https://github.com/SignalR/SignalR/blob/3c07d7bebc15ec9cbf6ac9d7339b5d2d54f6fab3/src/Microsoft.AspNet.SignalR.Core/GroupManager.cs#L86

If possible, you can try to create a issue on GitHub to clarify your scenario and question, ASP.NET SignalR team would share details or comment on it.

https://github.com/SignalR/SignalR/issues

With Regards,

Fei Han