why should a subscriber subscribe to more than one hub

[aaronpk]

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).

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From #127 by @mkovatsc

[aaronpk]

@julien51 do you have any recommendations here?

[julien51]

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]

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