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    <p>While Simon is right about the fact that the load balancer will handle all requests (you don't need to worry about which instance you'll need to connect to), there are other things that you'll need to take into account. From your question I understand that you want to broadcast messages for example.</p> <p>Let's assume you scaled your application to 2 instances:</p> <ul> <li>Instance 1</li> <li>Instance 2</li> </ul> <p>The load balancer will take care that all requests to <strong>yourapp.cloudapp.net</strong> go to one of these instances (round robin). Now let's say users A, B and C are routed to Instance 1 and users D, E and F to Instance 2:</p> <ul> <li>Instance 1: user A, user B, user C</li> <li>Instance 2: user D, user E, user F</li> </ul> <p>So let's assume user A does something in your application and you want to broadcast this to all your users. Instance 1 will only see 2 other connected users: user B and C and will send the message to those users. The issue here is that you also want to send the message to user D, E and F, even though these are on a different instance.</p> <p>That's why your WebSocket/broadcast/... framework (like SignalR) will need to use something like a service bus which is accessible from all instances. Take a look at how SignalR solves this issue by using <a href="https://github.com/SignalR/SignalR/wiki/Azure-service-bus" rel="nofollow">Windows Azure Service Bus</a> or <a href="https://github.com/SignalR/SignalR/wiki/SignalR-with-Redis-Running-on-a-Windows-Azure-Virtual-Machine" rel="nofollow">redis</a>.</p>
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    1. POWeb role scaling in windows azure
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    1. USSandrino Di Mattia
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    1. COOk so from what I've been reading on the Azure Service Bus, I could create a topic and subscribe to it in my web socket server (webrole.cs) class. Whenever a message is received from the web socket, a message is sent on the service bus. And whenever a message is received on the bus, it calls broadcast. In this way all instances should be subscribed to the service bus and broadcast all messages. I will try it out and let you know how it goes. Thanks for the suggestion Sandrino, your answers have been really helping me in all my Azure questions :)
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