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shared by Graham Perrin on 03 Nov 09 - Cached

August 27, 2009
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The Last Mile of the Internet
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NAT/Firewall issue makes any async messaging based approach useless for clients
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...9 more annotations...
Polling sucks. We think a decentralized pubsub layer is a fundamental, missing layer in the Internet architecture today
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a fundamental design that looks like this: This picture leaves out multiple publishers and subscribers and the subscriber registration process, but you get the basic idea
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fine for server subscribers (like, say Google Reader) but not for client subscribers (like, say TweetDeck).
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the only way to enable client subscribers to play in this async messaging world is via some type of relay service
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In this approach, the client subscriber makes an outbound connection to some type of relay infrastructure
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technically feasible
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Yes, having to relay messages sucks. But the question is
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which sucks worse: polling or relaying?
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Harry Pierson
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shared by Graham Perrin on 03 Nov 09 - Cached

shared by Graham Perrin on 03 Nov 09 - Cached

Comparison of PubSubHubbub to light-pinging protocols
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concrete differences between fat pinging (PubSubHubbub, XMPP pubsub) and light pinging (rssCloud, XML-RPC pings, changes.xml, SUP, SLAP)
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core difference
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...4 more annotations...
how new information from feeds is delivered from a publisher to a subscriber
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Light pings: Send the URL of the feed that has updated to the subscriber. Fat pings: Send the updated content of the feed to the subscriber
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Green is good, red is bad
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criteria to consider for each protocol
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