About docs here: http://channels.readthedocs.io/en/stable/deploying.html

"The fundamental difference is that the group mechanic requires all servers 
serving the same site to be able to see each other*; if you separate the 
site up and run it in a few, large clusters, messages to groups will only 
deliver to WebSockets connected to the same cluster.* For some site designs 
this will be fine, and if you think you can live with this and design 
around it (which means never designing anything around global notifications 
or events), this may be a good way to go."

It's not clear to me, the exact meaning of this. Channels won't work 
properly if there are multiple servers (load balanced) running the 
ASGI/listener (interface server?) code? Does this mean a broadcast 
happening at one node will only deliver to all the clients connected to 
that node? Isn't the point of using redis to be able to broadcast to 
everyone across every server?

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