Microsoft Contributes Azure-backed Scale Out of Persistent Connection Framework SignalR
A new open source contribution enables scaled out, high throughput messaging for the asynchronous ASP.NET web event engine, SignalR. In a recent blog post, Clemens Vasters, an Architect on the Windows Azure team, described a new GitHub project that that uses the Windows Azure Service Bus to distribute messages bi-directionally between servers and clients.
While SignalR has been shown to scale to tens of thousands of connections on a single machine, developers cannot deploy server-side components across multiple web servers. This leaves solutions with a single point of failure and limits the number of concurrent connections that an application can support. Vasters described how he solved this problem with the Azure Service Bus.
Last week, I built a Windows Azure Service Bus backplane for SignalR that allows deploying SignalR solutions to multiple nodes with message distribution across those nodes and ensuring proper ordering on a per-sender basis as well as node-to-node correctness and consistency for the cursor cookies. That code is Apache licensed and now available on github.
You can use this backplane irrespective where you host solutions that use SignalR, as long as your backend host has access to a Service Bus namespace. That’s obviously best in one of the Windows Azure datacenters, but will work just as well anywhere else, albeit with a few [milliseconds]more latency.
Users of this Azure-backed SignalR project can choose to split messaging traffic across Service Bus Topics which increases throughput beyond what a single Topic can support. This project from Vasters takes advantage of supported SignalR extension points and requires only a small modification to the server application. You can download or view the source code of this project by visiting its site on GitHub.
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