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w3c / websub

WebSub Spec in Social Web Working Group
https://w3c.github.io/websub/
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why should a subscriber subscribe to more than one hub #133

Open aaronpk opened 6 years ago

aaronpk commented 6 years ago

5: “If more than one URL is specified, it is expected that the publisher pings each of these URLs, so the subscriber may subscribe to one or more of these.”

Why should a subscriber subscribe to "more of these"? It would be more interesting to know how to pick a hub out of this list (always first might not be optimal).

From #127 by @mkovatsc

aaronpk commented 6 years ago

@julien51 do you have any recommendations here?

julien51 commented 6 years ago

Fault tolerance and redundancy is the main reason for this. If for some reason the hub in the middle fails to propagate the update, then using multiple independent hubs is a way to increase the delivery likeliness.

aaronpk commented 6 years ago

Thanks julien! I've added a note along these lines to the draft!