I don't know if there is a protocol for staged updating in which you have multiple sites that have certain information and it's replicated on multiple machines, but I'm sure there are some places that have done it. I mean, it makes a whole lot more sense for critical information to be replicated multiple places and when a change is made at any particular spot to propagate it to all others.
"Each server has replicated copies of everything and when changes are made, the changes are made at one of the regional sites then propagated to all the others"
is there such a thing called asynchrounous updating? and if so, is that it?
"Each server has replicated copies of everything and when changes are made, the changes are made at one of the regional sites then propagated to all the others"
is there such a thing called asynchrounous updating? and if so, is that it?
You might very well be communicating with your friend in China via a connection to a server within 40 miles if Facebook decides to decentralize its infrastructure such that it decides instead of having one huge server and lots of huge amounts of bandwidth for reaching the entire country, they break up their network into the top 200 or 300 regional locations and divert your traffic by ping to your nearest server.
Think about that. Maybe they have one server for everyone in Montana, and one server for the west side of Los Angeles, one server for Manhattan and another for the rest of New York City, one just for Chicago, Kansas City, Denver, Salt Lake Citym etc., then each regional server communicates with the main server - on a much smaller bandwidth than they need when talking to everyone at once - to update the master copy of your information, including in bulk all of the changes they've received for that server.
Each server has replicated copies of everything and when changes are made, the changes are made at one of the regional sites then propagated to all the others, making the network more resilient, since if the national site is down each site can simply send propagated changes to the other sites, and save the changes for the master site until later. Or maybe there is no "master site" it just picks one that the ping time is the fastest for you and hands you to that one.
We're talking traffic Mitch, and profitable traffic at that. Most traffic is cloud, downloads, or video and virtually all of that is directed either at a metro CDN/cache or a local server. Text exchanges don't need bandwidth.
70 destinations within 40 miles of us? Are you thinking here of caching? So if I'm corresponding with my friend in China over Facebook, I'm actually going to be connecting with a server that's within 40 miles of my location?
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